WO2024075472A1 - 液状付加硬化型フルオロシリコーン組成物、フルオロシリコーンゴム及び成形品 - Google Patents
液状付加硬化型フルオロシリコーン組成物、フルオロシリコーンゴム及び成形品 Download PDFInfo
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/42—Block-or graft-polymers containing polysiloxane sequences
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/10—Block- or graft-copolymers containing polysiloxane sequences
- C08L83/12—Block- or graft-copolymers containing polysiloxane sequences containing polyether sequences
Definitions
- the present invention relates to a liquid addition-curable fluorosilicone composition, a fluorosilicone rubber obtained by heat-curing the composition, and a molded article thereof.
- addition-cured fluorosilicone rubber compositions have been used in aircraft and vehicle rubber parts, printer parts, etc., because the cured products have excellent gasoline and oil resistance (Patent Document 1).
- Patent Document 1 the use of cured products of addition-cured fluorosilicone rubber compositions in mobile parts from the viewpoint of sebum resistance, and in sealing parts for fuel cell vehicles from the viewpoint of acid resistance, has been considered.
- the cured products of addition-cured fluorosilicone rubber compositions used in these parts are required to have low compression set and to maintain practical strength, i.e., mechanical strength.
- the development of a liquid addition-cured fluorosilicone rubber composition with excellent productivity has been desired.
- processing methods with excellent productivity include injection molding, compression molding, and injection molding using a mold, but there is a problem that liquid addition-cured fluorosilicone rubber compositions cannot be used unless they have a viscosity that can be applied to these processing methods.
- the first aspect of the present invention has been made in consideration of the above circumstances, and aims to provide a liquid addition-curable fluorosilicone composition that has good curability, retains mechanical strength, and is suitable for injection molding and the like. It also aims to provide a fluorosilicone rubber and a molded article thereof obtained by heat-curing the composition.
- the second aspect of the present invention has been made in consideration of the above circumstances, and aims to provide a liquid addition-curable fluorosilicone composition that has very good curability, excellent storage stability, and can give a fluorosilicone rubber that retains mechanical strength, and is suitable for processing with excellent productivity. It also aims to provide a fluorosilicone rubber obtained by curing the composition.
- a first aspect of the present invention provides an addition-curable fluorosilicone composition, comprising: (A) a fluorosilicone compound represented by the following general formula (1): (In the formula, R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms; Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, and a perfluoropolyether group having 3 to 30 carbon atoms; X is a divalent organic group; m is an integer from 0 to 100; and n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.) a vinyl group-containing organopolysiloxane having a viscosity at 25° C.
- R1 's are each independently a group selected from an alkyl group having
- R 4 is independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms
- Rf is independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms and a perfluoropolyether group having 3 to 30 carbon atoms
- X is a divalent organic group.
- the addition-curable fluorosilicone composition of the first aspect of the present invention has good curability, maintains mechanical strength, and is suitable for injection molding, etc.
- the first aspect of the present invention provides a fluorosilicone rubber that is a cured product of the above-mentioned addition-curable fluorosilicone composition.
- the fluorosilicone rubber of the first aspect of the present invention maintains good mechanical strength.
- the first aspect of the present invention provides a fluorosilicone rubber molded article, which is a molded article of the above-mentioned fluorosilicone rubber.
- the fluorosilicone rubber molded product of the first aspect of the present invention has excellent gasoline and oil resistance, making it suitable for use in aircraft and automotive rubber parts, printer parts, etc. Its sebum resistance makes it suitable for use in mobile parts, and its acid resistance makes it suitable for use in sealing parts for fuel cell vehicles.
- a liquid addition-curable fluorosilicone composition comprising: (A') a compound represented by the following general formula (1A): (In the formula, R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms; Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, or a perfluoropolyether group having 3 to 30 carbon atoms; X is a divalent organic group; m is an integer from 0 to 100; and n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.) an alkenyl group-containing organopolysiloxane having a viscosity at 25° C.
- R 4 is independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms
- Rf' is independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, or a perfluoropolyether group having 3 to 30 carbon atoms
- X is a divalent organic group.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention cures quickly even at relatively low temperatures, and therefore has very good curing properties while also having excellent storage stability, and can give a fluorosilicone rubber that retains its mechanical strength upon curing.
- This liquid addition-curable fluorosilicone composition is suitable as a material for highly productive processing such as casting, compression molding, and injection molding, and can therefore contribute to improving the productivity of molded products.
- the second aspect of the present invention provides a fluorosilicone rubber that is a cured product of the addition-curable fluorosilicone composition of the second aspect of the present invention.
- the fluorosilicone rubber of the second aspect of the present invention can exhibit low compression set and high mechanical strength.
- the addition-curable fluorosilicone composition of the first aspect of the present invention is liquid and cures quickly even at relatively low temperatures, resulting in good curing properties and a fluorosilicone rubber that retains its mechanical strength. Furthermore, this liquid addition-curable fluorosilicone composition is suitable as a material for casting, compression molding, and injection molding, and can therefore contribute to improving the productivity of molded products.
- liquid addition-curable fluorosilicone composition of the second aspect of the present invention cures quickly even at relatively low temperatures, and therefore has very good curing properties while also having excellent storage stability, making it possible to give a fluorosilicone rubber that retains its mechanical strength. Furthermore, this liquid addition-curable fluorosilicone composition is suitable as a material for highly productive processing such as casting, compression molding, and injection molding, and can therefore contribute to improving the productivity of molded products.
- the fluorosilicone rubber of the second aspect of the present invention can exhibit low compression set and high mechanical strength.
- the inventors conducted extensive research to achieve the above object, and discovered that by using a hydrogen polysiloxane with a specific structure in an addition-curable fluorosilicone composition that is liquid at 23°C, a fluorosilicone rubber that has good curing properties and retains mechanical strength can be obtained. Furthermore, they discovered that the liquid addition-curable fluorosilicone composition is suitable as a material for casting, compression molding, and injection molding, which led to the first aspect of the present invention. Specifically, the present invention provides the following fluorosilicone composition, fluorosilicone rubber, and molded article thereof.
- a first aspect of the present invention is an addition-curable fluorosilicone composition
- (A) a compound represented by the following general formula (1):
- R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms
- Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, and a perfluoropolyether group having 3 to 30 carbon atoms
- X is a divalent organic group
- m is an integer from 0 to 100
- n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.
- a vinyl group-containing organopolysiloxane having a viscosity at 25° C.
- R 4 is independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms
- Rf is independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms and a perfluoropolyether group having 3 to 30 carbon atoms
- X is a divalent organic group.
- the fluorosilicone composition of the first aspect of the present invention contains, as a base, a linear polysiloxane whose main chain is a repeating structure of diorganosiloxane units having fluoroalkyl groups.
- a typical dimethylsilicone composition contains, as a base, a linear dimethylpolysiloxane whose main chain is a repeating structure of dimethylsiloxane units.
- the fluorosilicone composition of the first aspect of the present invention is essentially different from a dimethylsilicone composition.
- the present inventors have discovered that by using an alkenyl group-containing organopolysiloxane of a specific structure and a hydrogenpolysiloxane of a specific structure in an addition-curable fluorosilicone composition that is liquid at 23°C, a liquid addition-curable fluorosilicone composition can be obtained that can give a fluorosilicone rubber that has good curing properties and retains mechanical strength. Furthermore, they have discovered that this liquid addition-curable fluorosilicone composition is suitable as a material for injection molding, compression molding, and injection molding. Based on these findings, the present inventors have completed the second aspect of the present invention.
- the second aspect of the present invention is A liquid addition-curable fluorosilicone composition
- a liquid addition-curable fluorosilicone composition comprising: (A') a compound represented by the following general formula (1A):
- R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms
- Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, or a perfluoropolyether group having 3 to 30 carbon atoms
- X is a divalent organic group
- m is an integer from 0 to 100
- n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.
- an alkenyl group-containing organopolysiloxane having a viscosity at 25° C.
- R 4 is independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms
- Rf' is independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, or a perfluoropolyether group having 3 to 30 carbon atoms
- X is a divalent organic group.
- the second aspect of the present invention is a fluorosilicone rubber that is a cured product of the addition-curable fluorosilicone composition of the second aspect of the present invention.
- the addition-curable fluorosilicone composition of the first aspect of the present invention is characterized in that it contains (A) a specific vinyl-containing organopolysiloxane having a viscosity of 100 to 500,000 mPa ⁇ s at 25° C., (B) a specific branched organohydrogenpolysiloxane having three or more silicon-bonded hydrogen atoms per molecule, (C) an addition reaction catalyst, and (D) a reinforcing silica filler that has been surface-treated with a specific organosilicon compound, and is in a liquid state at 23° C.
- the composition may further contain components other than the above components (A) to (D). These components will be described below.
- (A) Vinyl Group-Containing Organopolysiloxane Component (A) is an organopolysiloxane represented by the following general formula (1) and having a viscosity at 25° C. of 100 to 500,000 mPa ⁇ s.
- R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms;
- Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, and a perfluoropolyether group having 3 to 30 carbon atoms;
- X is a divalent organic group;
- m is an integer from 0 to 100; and n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.
- R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms; k is an integer from 1 to 10; m is an integer from 0 to 100; and n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.)
- R 1 may be, independently of one another, a group selected from an alkyl group having 1 to 8 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a hexyl group, a cyclohexyl group, etc., an aryl group having 6 to 12 carbon atoms, such as a phenyl group, a tolyl group, etc., and an aralkyl group having 7 to 12 carbon atoms, such as a benzyl group, etc.
- an alkyl group having 1 to 8 carbon atoms is preferred, and a methyl group is particularly preferred.
- Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms and a perfluoropolyether group having 3 to 30 carbon atoms.
- the perfluoroalkyl group is represented by the following formula: C k F 2k+1 - (k is an integer of 1 to 10):
- the perfluoropolyether group is exemplified by the following formula: (s and t are integers from 1 to 9) Examples are given below.
- X is a divalent organic group.
- X functions as a spacer that connects the main chain of the linear vinyl group-containing organopolysiloxane of component (A) with the Rf group in the side chain, and can adjust the interaction between the Rf groups or between the Rf group and other molecules to make the properties of the cured product, such as the hydrocarbon solvent resistance, desirable.
- the divalent organic group is not particularly limited, but can be an alkylene group having 2 to 4 carbon atoms, some of the hydrogen atoms of which may be substituted with fluorine atoms or the like, and may have an oxygen atom, an ester bond, or an amide bond in the middle or at the end.
- this divalent organic group examples include those of the following formula: (* is a bond to the Rf group, and ** is a bond to the silicon atom)
- the Rf-X group is preferably a C k F 2k+1 -CH 2 CH 2 group (k is an integer of 1 to 10), and more preferably a 3,3,3-trifluoropropyl group (k is 1).
- n is an integer from 1 to 800, preferably from 5 to 750, more preferably from 10 to 650, even more preferably from 50 to 650, and most preferably from 100 to 650.
- (m+n) is an integer in the range of 5 ⁇ m+n ⁇ 800, preferably 10 ⁇ m+n ⁇ 680, more preferably 60 ⁇ m+n ⁇ 680, and even more preferably 120 ⁇ m+n ⁇ 680.
- the number of fluoroalkyl group-containing siloxane units is preferably 10 mol % or more, more preferably 20 mol % or more, and particularly preferably 30 to 100 mol %, of all siloxane units in the molecule (particularly the sum of the difunctional siloxane units constituting the main chain (i.e., n+m).
- the upper limit is not particularly limited as long as it is 100 mol % or less, and may be 95 mol % or less, 90 mol % or less, or 80 mol % or less. This range is preferable because it provides excellent hydrocarbon solvent resistance.
- the viscosity of the organopolysiloxane (A) is characterized by being in the range of 100 to 500,000 mPa ⁇ s at 25°C, and is preferably in the range of 300 to 100,000 mPa ⁇ s. Within this range, the physical properties of the cured product are good, and the handling and workability of the composition are good. Furthermore, if the viscosity is less than 100 mPa ⁇ s, the strength of the resulting cured product is insufficient, and if it exceeds 500,000 mPa ⁇ s, the handling of the composition decreases, which is not preferable. In the first embodiment of the present invention, the viscosity is a value measured with a rotational viscometer using the method described in JIS K 7117-1:1999. The degree of polymerization of the organopolysiloxane (A) is a value in which the viscosity at 25°C falls within the above range.
- Organohydrogenpolysiloxane Component (B) is a branched organohydrogenpolysiloxane represented by the following formula (3) having three or more silicon-bonded hydrogen atoms in each molecule. This organohydrogenpolysiloxane undergoes a hydrosilylation addition reaction with component (A) and acts as a curing agent (crosslinking agent).
- the molecular structure of component (B) is a branched siloxane modified with terminal hydrogen, and by including this organohydrogensiloxane, the fluorosilicone composition cures quickly, and the fluorosilicone rubber cured product can have high strength.
- R 4 is independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms;
- Rf is independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms and a perfluoropolyether group having 3 to 30 carbon atoms; and
- X is a divalent organic group.
- x1 is a number of 2 ⁇ x1 ⁇ 4, x2 is an integer of 0 ⁇ x2 ⁇ 20, and x3 is an integer of 0 ⁇ x3 ⁇ 20, satisfying 0 ⁇ x2+x3 ⁇ 20; y1 is an integer of 0 ⁇ y1 ⁇ 30, z1 is an integer of 0 ⁇ z1 ⁇ 10, y2 is an integer of 0 ⁇ y2 ⁇ 30, z2 is an integer of 0 ⁇ z2 ⁇ 10, and z1+z2>0.)
- the monovalent organic group R4 bonded to a silicon atom other than a hydrogen atom bonded to the silicon atom is a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms, and examples thereof include monovalent hydrocarbon groups having 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms, that do not contain an aliphatic unsaturated bond, such as an unsubstituted or substituted alkenyl group.
- Examples of such monovalent hydrocarbon groups include alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, cyclohexyl, octyl, nonyl, and decyl groups; aryl groups such as phenyl, tolyl, xylyl, and naphthyl groups; and aralkyl groups such as benzyl, phenylethyl, and phenylpropyl groups, and preferably a methyl group.
- alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, cyclohexyl, octyl, nonyl, and decy
- the number of silicon atoms in one molecule of component (B) ((x1+x2+x3+y1+y2+z1+z2) or the degree of polymerization) is preferably 4 to 60, more preferably 4 to 50, and even more preferably 4 to 40.
- the monovalent organic group Rf bonded to a silicon atom other than a hydrogen atom bonded to the silicon atom is a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms and a perfluoropolyether group having 3 to 30 carbon atoms, and examples thereof include the groups shown for Rf in formula (1) above.
- a perfluoroalkyl group is preferred, and a trifluoromethyl group is more preferred.
- X is a divalent organic group, and examples thereof include the groups shown for X in formula (1) above.
- Rf-X group a C k F 2k+1 -CH 2 CH 2 group (k is an integer of 1 to 10) is preferable, and a 3,3,3-trifluoropropyl group (k is 1) is more preferable.
- x2, x3, y1, y2, z1, and z2 are not all 0 at the same time. Since z1+z2>0, the branched organohydrogenpolysiloxane represented by the above formula (3) contains one or more z1 units or z2 units, which are T units.
- component (B) examples include, but are not limited to, the branched organohydrogenpolysiloxanes shown below.
- Component (B) should be liquid at room temperature (25°C).
- the viscosity of component (B) at 25°C is preferably 0.1 to 1,000 mPa ⁇ s, more preferably 0.5 to 500 mPa ⁇ s, and even more preferably 1 to 200 mPa ⁇ s. A viscosity within this range will ensure good workability.
- the amount of component (B) is an amount such that the number of hydrogen atoms bonded to silicon atoms in component (B) is 0.5 to 10 per silicon-bonded vinyl group in the composition.
- the ratio of the number of silicon-bonded hydrogen atoms (hydrosilyl groups) in component (B) to one silicon-bonded vinyl group (SiVi group) in the composition is within the range of 0.5 to 10, preferably 1 to 5. If the amount of component (B) is less than the lower limit, the resulting composition will not cure sufficiently. If the amount of component (B) exceeds the upper limit, the heat resistance of the resulting silicone rubber will be extremely poor.
- a vinyl-containing silicon compound such as a vinyl-containing organosiloxane other than component (A)
- component (B) it is sufficient that the ratio of the number of silicon-bonded hydrogen atoms in component (B) to the number of vinyl groups bonded to silicon atoms in the composition satisfies the above range.
- the component (B) may be used alone or in combination of two or more types.
- the branched organohydrogenpolysiloxane represented by formula (3) may contain hydroxyl groups and/or alkoxy groups in the molecule.
- hydroxyl groups and/or alkoxy groups having 1 to 6 carbon atoms may be contained within a range of 20 mol % or less of all the substituents of the organopolysiloxane.
- alkoxy groups having 1 to 6 carbon atoms include methoxy groups, ethoxy groups, n-propoxy groups, isopropoxy groups, n-butoxy groups, isobutoxy groups, t-butoxy groups, pentyloxy groups, neopentyloxy groups, and hexyloxy groups, and in particular methoxy groups, ethoxy groups, and isopropoxy groups.
- the addition reaction catalyst of the component (C) may be any catalyst that promotes the addition reaction between the vinyl group in the composition and the hydrogen atom bonded to the silicon atom in the component (B).
- platinum group metal catalysts are preferably used.
- the component (C) may be used alone or in combination of two or more.
- the amount of component (C) to be blended may be an effective amount as a catalyst (catalytic amount), but is usually in the range of 0.5 to 1,000 ppm, preferably 1 to 500 ppm, and more preferably 10 to 100 ppm, by mass, converted into catalytic metal element (platinum group metal element) relative to the amount of component (A). If this range is satisfied, the reaction rate of the addition reaction will be appropriate, and the heat resistance of the cured product will be good.
- Reinforcing Silica Filler Component (D) is a reinforcing silica that has been surface-treated with a linear organosilicon compound having silanol groups at both molecular chain terminals, as represented by the following formula (2).
- R 3 is, independently of each other, a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, and examples thereof include those described above for R 1.
- a methyl group is preferable.
- R 2 is a group represented by R 3 above, or a 3,3,3-trifluoropropyl group, with the proviso that at least one R 2 is a 3,3,3-trifluoropropyl group.
- p is an integer satisfying 1 ⁇ p ⁇ 20, and is preferably an integer from 3 to 9.
- the reinforcing silica filler is essential for imparting mechanical strength to the resulting silicone rubber. If the organosilicon compound represented by the above formula (2) does not have a 3,3,3-trifluoropropyl group, the resulting cured product will have inferior tensile strength, elongation at break, compression set, etc.
- reinforcing silica filler that has been surface-treated with a linear organosilicon compound having both molecular chain terminals blocked with silanol groups, it is possible to reduce the viscosity of the composition and the compression set of the rubber after heat curing.
- the reinforcing silica filler those conventionally used in silicone rubber compositions can be used, and precipitated silica (wet silica), fumed silica (dry silica), fired silica, etc. are preferred. Fumed silica is particularly preferred.
- the (D) component is a surface-untreated silica that has been previously surface-treated with the organosilicon compound of formula (2).
- the surface-untreated silica may be kneaded with a polysiloxane component (i.e., component (A)), and the organosilicon compound of formula (2) may be added, and the mixture may be heated and mixed, preferably in the presence of a small amount of water, to perform surface treatment in the mixture.
- the surface-untreated silica used in the first aspect of the present invention refers to silica that has not been surface-treated with the organosilicon compound of formula (2), and may be dry silica (e.g., Aerosil R-974, etc.) that has been surface-treated with dimethyldichlorosilane or the like. It is preferable to further treat the surface of the dry silica that has been surface-treated with dimethyldichlorosilane or the like in this way with the organosilicon compound of formula (2).
- dry silica e.g., Aerosil R-974, etc.
- the amount of the organosilicon compound of formula (2) is preferably 1 to 30 parts by mass, and more preferably 2 to 20 parts by mass, per 40 parts by mass of silica before surface treatment with the organosilicon compound of formula (2).
- organosilanes and organosilazanes other than the organosilicon compound of formula (2) above may be used in combination as surface treatment agents.
- organosilanes include chlorosilanes such as trimethylchlorosilane, dimethyldichlorosilane, dimethylvinylchlorosilane, and trivinylchlorosilane; alkoxysilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, butyltrimethoxysilane, dimethyldimethoxysilane, diethyldimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, trimethylmethoxysilane, triethylmethoxysilane, and vinyltris(methoxyethoxy)silane; and silazanes such as hexamethyldisilazane, hexamethylcyclo
- hexamethyldisilazane and 1,3-divinyl-1,1,3,3-tetramethyldisilazane are preferred.
- the amount of these organosilanes or organosilazanes used for surface treatment is preferably 0.1 to 15 parts by mass, and more preferably 0.1 to 10 parts by mass, per 40 parts by mass of untreated silica.
- the BET specific surface area of the silica before surface treatment with the organosilicon compound of formula (2) is 50 m 2 /g or more, preferably 100 to 400 m 2 /g, and more preferably 150 to 350 m 2 /g. If the specific surface area is 50 m 2 /g or more, sufficient strength is obtained and the appearance of the rubber molded product is also improved. If it is 400 m 2 /g or less, compounding is easy.
- the BET specific surface area of the silica after surface treatment may also be within the above range.
- the amount of component (D) to be blended is 10 to 60 parts by mass, and preferably 15 to 55 parts by mass, per 100 parts by mass of component (A). If the blending amount is less than the lower limit, the resulting silicone rubber will not have sufficient rubber strength, and if the blending amount exceeds the upper limit, it will be difficult to blend the silicone rubber into the composition.
- the liquid addition curable fluorosilicone composition of the first embodiment of the present invention may contain other components other than the components (A) to (D) as necessary.
- other components include conductive agents such as carbon black, conductive zinc oxide, and metal powder, nitrogen-containing compounds, acetylene compounds such as ethynylcyclohexanol, hydrosilylation reaction inhibitors such as phosphorus compounds, nitrile compounds, carboxylates, tin compounds, mercury compounds, and sulfur compounds, heat resistance imparting agents such as iron oxide and cerium oxide, compression set improvers such as triazole compounds and benzotriazole derivatives such as benzotriazole silane, internal release agents such as dimethyl silicone oil, adhesion imparting agents, and thixotropy imparting agents.
- the liquid addition curable fluorosilicone composition of the first embodiment of the present invention does not contain an isocyanuric acid derivative having three trialkoxy groups in one molecule.
- the liquid addition-curable fluorosilicone composition of the first aspect of the present invention can be prepared by uniformly mixing the above components (A) to (D) and, if necessary, each optional component, using a conventional mixer, stirrer, kneader, or other such device as a kneader or planetary mixer.
- the composition of the first aspect of the present invention is characterized in that it is liquid at 23°C.
- liquid at 23°C means that it has a certain volume at 23°C, but changes shape (has fluidity) according to the shape of the container.
- the viscosity at 23°C and a shear rate of 10s -1 is preferably 1,500 Pa ⁇ s or less, more preferably 100 to 1,200 Pa ⁇ s, and even more preferably 200 to 1,100 Pa ⁇ s. If the viscosity exceeds 1,500 Pa ⁇ s, it may take a long time to supply the material when performing injection, compression, and injection molding, and productivity may be significantly reduced.
- the viscosity at the above shear rate was measured using a precision rotational viscometer (manufactured by Thermo Fisher Scientific).
- the liquid addition-curable fluorosilicone composition of the first aspect of the present invention can also be a two-liquid type.
- each component can be appropriately divided so that the crosslinking agent (B) and the addition reaction catalyst (C) are not mixed in the same composition (liquid A or B).
- a two-liquid type composition can be made consisting of liquid A containing components (A), (C), and (D), and liquid B containing components (A), (B), and (D), and it is preferable to prepare it so that they can be mixed in equal masses or volumes.
- the liquid addition-curable fluorosilicone composition of the first aspect of the present invention can be applied to various molding methods such as injection molding, compression molding, and injection molding. Below, the molding method of fluorosilicone rubber by injection molding, compression molding, or injection molding will be explained in detail.
- liquid addition-curing fluorosilicone composition is divided into two liquid types, liquid A and liquid B.
- the two liquids are mixed in equal amounts and injected into a metal mold, where they are heated and cured in a thermostatic bath to form silicone rubber.
- a metal mold is placed on a compressor such as a press, and equal amounts of the above liquids A and B are mixed in the same way as in injection molding, injected into the mold, where they are heated and cured to form silicone rubber.
- liquid A and liquid B are supplied from the material supply pump to a metering machine. From the metering machine, liquid A and liquid B are merged in equal amounts through the material supply line. The material is mixed in the screw and cylinder parts of the molding machine body. It is then injected into a mold, where it is heated and cured to form silicone rubber.
- the liquid addition-curable fluorosilicone composition of the first aspect of the present invention is particularly suitable for liquid silicone rubber injection molding systems (LIMS: Liquid Injection Molding System).
- LIMS is a molding processing system that combines liquid silicone rubber, which has excellent properties, with a molding machine that precisely and stably injects it, and can automate everything from mixing to molding, simplifying and shortening the process while facilitating the molding of high-quality products.
- the composition of the first aspect of the present invention has the following advantages: That is, (i) the curing speed is fast, and molding time can be shortened, which allows for shortening of the process; (ii) since the material is liquid, molding can be performed at low injection pressure, and precision parts can also be molded, improving productivity; (iii) since it is compatible with flash-free and runnerless molding and has excellent release properties after curing, the molding process can be automated; and (iv) since there are no by-products from the curing reaction, and since flash-free and runnerless molding eliminates the need for waste disposal, environmentally friendly manufacturing is possible.
- the first aspect of the present invention provides a fluorosilicone rubber that is a cured product of the above-mentioned addition-curable fluorosilicone composition.
- a fluorosilicone rubber can maintain good mechanical strength.
- the composition can be cured according to known techniques, and there are no particular limitations on the curing method or conditions.
- the conditions for hardening and molding (primary cure) of the liquid addition-curing fluorosilicone composition may be the same as those for known addition-reaction-curing silicone compositions, and the composition can be hardened and molded by heating at a hardening temperature of 80-220°C, particularly 120-200°C, and for a hardening time of 3 seconds to 10 minutes, particularly 5 seconds to 5 minutes. If necessary, the molded cured product may be post-cured (secondary cure), for example, at 180-220°C for about 30 minutes to 6 hours.
- the cured product (silicone rubber) obtained from the liquid addition-curable fluorosilicone composition of the present invention has a compression set of 10% or less after 22 hours of compression at 180°C, and a mechanical strength of tensile strength of 5.0 MPa or more, as measured according to the description of JIS K 6249:2003.
- the compression set of the cured product after 22 hours of compression at 180°C at a compression rate of 25%, as measured according to JIS K 6249:2003 should be 15% or less, preferably 10% or less.
- the cured product can be used as a part (molded product) such as a sealing material, O-ring, or packing.
- the mechanical strength should be tensile strength of 4.5 MPa or more, preferably 5.0 MPa or more.
- the first aspect of the present invention provides a fluorosilicone rubber molded article, which is a molded article of the above-mentioned fluorosilicone rubber.
- the fluorosilicone rubber molded products obtained by heat curing the liquid addition-curable fluorosilicone composition of the first aspect of the present invention have excellent gasoline and oil resistance, and are therefore suitable for use in aircraft and automotive rubber parts, printer parts, etc. In recent years, they have also been used in mobile parts due to their sebum resistance, and in sealing parts for fuel cell vehicles due to their acid resistance.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention generally comprises (A') an alkenyl-containing organopolysiloxane, (B') an organohydrogenpolysiloxane, (C') an addition reaction catalyst, and (D') a reinforcing silica filler.
- liquid addition-curable fluorosilicone composition according to the second aspect of the present invention are described in more detail below.
- Alkenyl Group-Containing Organopolysiloxane Component (A') is an alkenyl group (vinyl group)-containing organopolysiloxane represented by the following general formula (1A) and having a viscosity at 25°C of 100 to 500,000 mPa ⁇ s.
- R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms;
- Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, or a perfluoropolyether group having 3 to 30 carbon atoms;
- X is a divalent organic group;
- m is an integer from 0 to 100; and n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.
- the component (A') is preferably represented by the following formula (1A'):
- R1 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms; k is an integer from 1 to 10; m is an integer from 0 to 100; and n is an integer from 1 to 800, with the proviso that 5 ⁇ m+n ⁇ 800.
- the organopolysiloxane has a perfluoroalkyl group and is represented by the formula:
- R 1 is, independently of each other, a group selected from alkyl groups having 1 to 8 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a hexyl group, and a cyclohexyl group, aryl groups having 6 to 12 carbon atoms, such as a phenyl group, a tolyl group, and an aralkyl group having 7 to 12 carbon atoms, such as a benzyl group.
- alkyl group having 1 to 8 carbon atoms is preferred, and a methyl group is particularly preferred.
- Rf's are each independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, or a perfluoropolyether group having 3 to 30 carbon atoms.
- the perfluoroalkyl group is represented by the following formula: C k F 2k+1 - (k is an integer of 1 to 10). Examples are given below.
- the perfluoropolyether group may be represented by the following formula: (s and t are each an integer from 1 to 9) Examples are given below.
- X is a divalent organic group.
- divalent organic group examples include those represented by the following formula: (* is a bond bonded to the Rf group, and ** is a bond bonded to the silicon atom)
- n is an integer from 1 to 800, preferably from 5 to 750, more preferably from 10 to 650, even more preferably from 50 to 650, and most preferably from 100 to 650.
- (m+n) is an integer in the range of 5 ⁇ m+n ⁇ 800, preferably 10 ⁇ m+n ⁇ 680, more preferably 60 ⁇ m+n ⁇ 680, and even more preferably 120 ⁇ m+n ⁇ 680.
- the viscosity of the organopolysiloxane of component (A') is characterized by being in the range of 100 to 500,000 mPa ⁇ s at 25°C, and is preferably in the range of 300 to 100,000 mPa ⁇ s. Within this range, the physical properties of the cured product are good, and the handling and workability of the composition are good. Furthermore, if the viscosity is less than 100 mPa ⁇ s, the strength of the resulting cured product is insufficient, and if it exceeds 500,000 mPa ⁇ s, the handling of the composition is reduced, which is not preferable.
- the viscosity is a value measured with a rotational viscometer using the method described in JIS K 7117-1:1999.
- the degree of polymerization of organopolysiloxane (A') is a value in which the viscosity at 25°C falls within the above range.
- the number of siloxane units having a perfluoroalkyl group or a perfluoropolyether group is preferably 10 mol % or more, more preferably 20 mol % or more, and particularly preferably 30 to 100 mol %, of all siloxane units in the molecule (particularly the sum of the bifunctional siloxane units constituting the main chain (i.e., n + m).
- the upper limit is not particularly limited as long as it is 100 mol % or less, and may be 95 mol % or less, 90 mol % or less, or 80 mol % or less. This range is preferable because it can provide excellent hydrocarbon solvent resistance.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention contains as a base a linear polysiloxane whose main chain is a repeating structure of diorganosiloxane units having perfluoroalkyl groups or perfluoropolyether groups.
- a typical dimethylsilicone composition contains as a base a linear dimethylpolysiloxane whose main chain is a repeating structure of dimethylsiloxane units.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention is essentially different from a dimethylsilicone composition.
- the organohydrogenpolysiloxane of the component (B') is represented by the following formula (2A):
- R 4 is independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms
- Rf' is independently a group selected from a perfluoroalkyl group having 1 to 10 carbon atoms, or a perfluoropolyether group having 3 to 30 carbon atoms
- X is a divalent organic group.
- the organohydrogenpolysiloxane has 3 to 5 silicon-bonded hydrogen atoms per molecule, and is represented by the following formula:
- the organohydrogenpolysiloxane undergoes a hydrosilylation addition reaction with component (A') and acts as a curing agent (crosslinking agent).
- component (B') is preferably a branched siloxane modified with terminal hydrogen, and by including this organohydrogensiloxane, the silicone rubber cured product can be cured quickly and with high strength.
- the organohydrogenpolysiloxane of component (B') is preferably represented by the following formula (2A'):
- R4 's are each independently a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms
- X is a divalent organic group.
- x1' is an integer of 3 ⁇ x1' ⁇ 5, x2' and x3' are integers of 0 ⁇ x2'+x3' ⁇ 20, y1' is an integer of 0 ⁇ y1' ⁇ 30, y2' is an integer of 0 ⁇ y2' ⁇ 30, w is 0 ⁇ w ⁇ 10, and k is an integer of 1 to 10, with the proviso that x2', x3', y1', and y2' are not all 0 at the same time.)
- the organohydrogenpolysiloxane has 3 to 5 silicon-bonded hydrogen atoms per molecule, and is represented by the following formula:
- Examples of monovalent organic groups R4 bonded to silicon atoms other than hydrogen atoms bonded to silicon atoms include alkyl groups having 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms, which are unsubstituted or substituted monovalent hydrocarbon groups that do not contain aliphatic unsaturated bonds, such as alkenyl groups, aryl groups having 6 to 12 carbon atoms that do not contain aliphatic unsaturated bonds, and aralkyl groups having 7 to 12 carbon atoms that do not contain aliphatic unsaturated bonds.
- Examples of such groups include alkyl groups such as methyl groups, ethyl groups, propyl groups, isopropyl groups, butyl groups, isobutyl groups, tert-butyl groups, pentyl groups, neopentyl groups, hexyl groups, cyclohexyl groups, octyl groups, nonyl groups, and decyl groups, aryl groups such as phenyl groups, tolyl groups, xylyl groups, and naphthyl groups, and aralkyl groups such as benzyl groups, phenylethyl groups, and phenylpropyl groups, with methyl groups being preferred.
- alkyl groups such as methyl groups, ethyl groups, propyl groups, isopropyl groups, butyl groups, isobutyl groups, tert-butyl groups, pentyl groups, neopentyl groups, hexyl groups,
- the number of silicon atoms (or degree of polymerization) in one molecule of component (B') is preferably 4 to 60, more preferably 4 to 50, and even more preferably 4 to 40.
- the monovalent organic group Rf' bonded to a silicon atom other than a hydrogen atom bonded to the silicon atom is a perfluoroalkyl group having 1 to 10 carbon atoms or a perfluoropolyether group having 3 to 30 carbon atoms, preferably a perfluoroalkyl group, and more preferably a 3,3,3-trifluoropropyl group.
- Component (B') should be liquid at room temperature (25°C).
- the viscosity of component (B') at 25°C is preferably 0.1 to 1,000 mPa ⁇ s, more preferably 0.5 to 500 mPa ⁇ s, and even more preferably 1 to 200 mPa ⁇ s. If the viscosity at 25°C is 0.1 to 1,000 mPa ⁇ s, good workability can be achieved.
- the amount of component (B') is such that the ratio of the number of silicon-bonded hydrogen atoms in component (B') to one silicon-bonded alkenyl group in the composition of the second embodiment of the present invention is within the range of 0.5 to 10, preferably 1 to 5. If the amount of component (B') is less than the above lower limit, the resulting composition will not cure sufficiently. If the amount of component (B') exceeds the above upper limit, the heat resistance of the resulting silicone rubber will be extremely poor.
- component (A') when an alkenyl-containing organosiloxane other than component (A') described below is included, it is sufficient that the ratio of the number of silicon-bonded hydrogen atoms in component (B') to the number of alkenyl groups bonded to silicon atoms in the composition satisfies the above range.
- the (B') component may be used alone or in combination of two or more types.
- the (B') component may be used in combination with two or more types of organohydrogenpolysiloxanes having two or more silicon-bonded hydrogen atoms in each molecule.
- the addition reaction catalyst of component (C') may be any catalyst that promotes the addition reaction between the alkenyl group (vinyl group) in component (A') and the hydrogen atom bonded to the silicon atom in component (B'). Usually, platinum group metal catalysts are preferably used.
- platinum, palladium, rhodium, etc. chloroplatinic acid, alcohol-modified chloroplatinic acid, coordination compounds of chloroplatinic acid with olefins, vinylsiloxane or acetylene compounds, tetrakis(triphenylphosphine)palladium, chlorotris(triphenylphosphine)rhodium, etc., platinum group metals or compounds thereof are listed, and particularly preferred are platinum compounds.
- Component (C') may be used alone or in combination of two or more types.
- the amount of component (C') to be blended may be an effective amount as a catalyst, but is usually in the range of 0.5 to 1,000 ppm, preferably 1 to 500 ppm, and more preferably 10 to 100 ppm, by mass, converted into catalytic metal element (platinum group metal element) relative to the amount of component (A'). If this range is satisfied, the reaction rate of the addition reaction will be appropriate, and the heat resistance of the cured product will be good.
- (D') Reinforcing Silica Filler Component (D') is a reinforcing silica that has been surface-treated with a linear organosilicon compound having silanol groups at both molecular chain terminals, represented by the following formula (3A).
- R 3 is, independently of each other, a group selected from an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 12 carbon atoms, and examples thereof include those described above for R 1.
- a methyl group is preferable.
- R 2 is, independently of each other, a group represented by R 3 above, or a 3,3,3-trifluoropropyl group, with the proviso that at least one of R 2 is a 3,3,3-trifluoropropyl group.
- p is an integer satisfying 1 ⁇ p ⁇ 20, and is preferably an integer from 3 to 9.
- the reinforcing silica filler is essential for imparting mechanical strength to the resulting silicone rubber. If the organosilicon compound represented by the above formula (3A) does not have a 3,3,3-trifluoropropyl group, the resulting cured product will have inferior tensile strength, elongation at break, compression set, etc.
- the reinforcing silica filler may be any of those conventionally used in silicone rubber compositions, with precipitated silica (wet silica), fumed silica (dry silica), calcined silica, etc. being preferred. Fumed silica is particularly preferred.
- the (D') component may be surface-untreated silica that has been previously surface-treated with the organosilicon compound of formula (3A).
- the surface-untreated silica may be kneaded with a polysiloxane component (i.e., component (A')), and the organosilicon compound of formula (3A) may be added, and the mixture may be heated and mixed, preferably in the presence of a small amount of water, to perform surface treatment in the mixture.
- the surface-untreated silica used in the second aspect of the present invention may preferably be dry silica (e.g., Aerosil R-974, etc.) that has been surface-treated with dimethyldichlorosilane or the like. It is preferable to further treat the surface of the dry silica that has been surface-treated with dimethyldichlorosilane or the like in this way with the organosilicon compound of formula (3A).
- the amount of the organosilicon compound of formula (3A) is preferably 1 to 30 parts by mass, and more preferably 2 to 20 parts by mass, per 40 parts by mass of silica prior to surface treatment with the organosilicon compound of formula (3A).
- organosilanes and organosilazanes other than the organosilicon compound of the above formula (3A) may be used in combination as a surface treatment agent.
- organosilanes include chlorosilanes such as trimethylchlorosilane, dimethyldichlorosilane, dimethylvinylchlorosilane, and trivinylchlorosilane, alkoxysilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, butyltrimethoxysilane, dimethyldimethoxysilane, diethyldimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, trimethylmethoxysilane, triethylmethoxysilane, and vinyltris(methoxyethoxy)silane, and silazanes such as hexamethyldisilazane, he
- the BET specific surface area of the silica before surface treatment with the organosilicon compound of formula (3A) is 50 m 2 /g or more, preferably 100 to 400 m 2 /g, and more preferably 150 to 350 m 2 /g. If the specific surface area is 50 m 2 /g or more, sufficient strength is obtained and the appearance of the rubber molded product is good. If the specific surface area is 400 m 2 /g or less, compounding is easy.
- the BET specific surface area of the silica after surface treatment may also be within the above range.
- the amount of component (D') is 10 to 60 parts by mass, and preferably 15 to 55 parts by mass, per 100 parts by mass of component (A'). If the amount is less than the lower limit, the resulting silicone rubber will not have sufficient rubber strength, and if the amount is more than the upper limit, it will be difficult to incorporate it into the composition.
- the liquid addition-curable fluorosilicone composition according to the second embodiment of the present invention may contain other components in addition to the above-mentioned components (A') to (D'), as necessary. There are no particular limitations on the amounts added.
- conductive agents such as carbon black, conductive zinc oxide, and metal powder
- hydrosilylation reaction inhibitors such as nitrogen-containing compounds, acetylene compounds, phosphorus compounds, nitrile compounds, carboxylates, tin compounds, mercury compounds, and sulfur compounds
- heat resistance imparting agents such as iron oxide and cerium oxide
- compression set improvers such as triazole compounds and benzotriazole derivatives
- internal release agents such as dimethyl silicone oil
- adhesive agents and thixotropy imparting agents.
- thixotropy imparting agents It is preferable that the liquid addition-curable fluorosilicone composition of the second aspect of the present invention does not contain an isocyanuric acid derivative having three trialkoxy groups in one molecule.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention can be prepared, for example, by uniformly mixing the above-mentioned components (A') to (D'), and, if necessary, each optional component, using a conventional mixer/stirrer, kneader, or other such device as a kneader or planetary mixer.
- the composition according to the second aspect of the present invention is characterized in that it is liquid at 23°C.
- the viscosity at 23°C and a shear rate of 10s -1 is preferably 1,500 Pa ⁇ s or less, more preferably 100 to 1,200 Pa ⁇ s, and even more preferably 200 to 1,100 Pa ⁇ s. If the viscosity is 1,500 Pa ⁇ s or less, it does not take much time to supply the material when performing injection, compression, and injection molding, and high productivity can be provided.
- the viscosity at the above shear rate was measured using a precision rotational viscometer (manufactured by Thermo Fisher Scientific).
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention can also be a two-liquid type.
- each component can be appropriately divided so that the crosslinking agent (B') and the addition reaction catalyst (C') are not mixed in the same composition (Liquid A or Liquid B).
- a two-liquid type composition can be made consisting of Liquid A containing components (A'), (C'), and (D') and Liquid B containing components (A'), (B'), and (D'), and it is preferable to prepare it so that it can be mixed in equal masses or volumes.
- the fluorosilicone rubber is a cured product of the addition-curable fluorosilicone composition according to the second aspect of the present invention.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention can be applied to various molding methods such as injection molding, compression molding, and injection molding.
- injection molding compression molding
- injection molding injection molding
- injection molding compression molding
- injection molding injection molding
- liquid addition-curing fluorosilicone composition is divided into two liquids, liquid A and liquid B.
- the two liquid materials (components) are mixed in equal amounts and injected into a metal mold, where they are heated in a thermostatic bath to harden and form silicone rubber.
- a metal mold is placed on a compressor such as a press, and equal amounts of the above liquids A and B are mixed in the same way as in injection molding, and then injected into the mold, where it is heated to harden and form the silicone rubber.
- liquid A and liquid B are supplied to a metering machine from a material supply pump. From the metering machine, liquid A and liquid B join together in equal amounts through a material supply line. The materials are mixed in the screw and cylinder sections of the molding machine body. They are then injected into a mold, where they are heated and hardened to form silicone rubber.
- the conditions for hardening and molding (primary cure) of the liquid addition-curing fluorosilicone composition may be the same as those for known addition-reaction-curing silicone compositions, and the composition can be hardened and molded by heating at a hardening temperature of 80-220°C, particularly 120-200°C, and for a hardening time of 3 seconds to 10 minutes, particularly 5 seconds to 5 minutes. If necessary, the molded cured product may be post-cured (secondary cure), for example, at 180-220°C for about 30 minutes to 6 hours.
- the cured product (silicone rubber) obtained from the liquid addition-curable fluorosilicone composition of the second aspect of the present invention may have a compression set of 10% or less after 22 hours of compression at 180°C, as measured according to the description of JIS K 6249:2003, and a tensile strength of 5.0 MPa or more as mechanical strength.
- the compression set of the cured product may be 15% or less, and preferably 10% or less, as measured according to JIS K 6249:2003, after 22 hours of compression at 180°C with a compression ratio of 25%.
- the cured product can be used as a part (molded body) such as a sealing material, O-ring, or packing.
- the mechanical strength is preferably 4.5 MPa or more in tensile strength, and more preferably 5.0 MPa or more.
- the fluorosilicone rubber molded product (silicone rubber) obtained by heat curing the liquid addition-curable fluorosilicone composition of the second aspect of the present invention has excellent gasoline and oil resistance, and can therefore be suitably used for aircraft and automotive rubber parts, printer parts, etc. In recent years, it has also been suitable for use in mobile parts due to its sebum resistance, and sealing parts for fuel cell vehicles due to its acid resistance.
- the curability of the composition was measured using a curability tester [rotorless disc rheometer, moving die rheometer, or MDR] at 130°C for 3 minutes, with the 10% and 90% curing times (i.e., the time from the start of measurement at 130°C to give 10% and 90% torque values of the maximum torque value in 3 minutes from the start of measurement) defined as T10 and T90 (seconds).
- the hardness, tensile strength, elongation at break, and tear strength (angle) of the cured product were measured by the following methods.
- the composition was press-cured at 150° C. for 10 minutes and then post-cured in a thermostatic chamber at 200° C. for 4 hours.
- the hardness (type A durometer hardness), tensile strength, elongation at break, and tear strength (angle) of the resulting cured product were measured according to the specifications of JIS K 6249:2003.
- the compression set of the cured product was measured by the following method.
- the composition was cured (press cured) at 150° C. for 15 minutes, and then secondary vulcanized (post cured) in a thermostatic chamber at 200° C. for 4 hours.
- the compression set of the resulting cured product was measured after compression at 180° C. for 22 hours at a compression ratio of 25% according to the description of JIS K 6249:2003.
- Example 1 to 4 and Comparative Examples 1 and 2 The components used in the following Examples 1 to 4 and Comparative Examples 1 and 2 are as follows.
- Component (D) fumed silica having a specific surface area of 200 m 2 /g as measured by the BET method (Aerosil R-974, manufactured by Nippon Aerosil Co., Ltd.); An organosilicon compound represented by the following formula (5):
- Reaction inhibitor ethynylcyclohexanol
- Compression set improver benzotriazole silane represented by the following formula (7)
- Heat resistance agent cerium oxide
- silicone rubber base A1 60 parts by mass of trifluoropropylmethylpolysiloxane represented by the above formula (4) was added, and after mixing for 30 minutes, silicone rubber base A1 was obtained.
- the amount of component (D) per 100 parts by mass of component (A) was 35 parts by mass.
- Examples 1 to 4 A silicone rubber composition was prepared in the amounts shown in Table 1 below. The viscosity of the resulting composition was measured under the conditions described above, and a cured product was prepared and the above general physical properties were measured. These results are shown in Table 1.
- the "Curability T10/T90” column shows the 10% and 90% curing times (seconds) determined by the above measurement method, and the “Curability T90-T10” column shows the difference between them. The smaller the difference, the faster the curing.
- SiH/SiVi is the ratio of the number of SiH groups in component (B) to the number of SiVi groups in the composition.
- the cured product obtained from the liquid addition-curable fluorosilicone composition of the first embodiment of the present invention has good curability (fast curing) and excellent tensile strength and elongation at break.
- the fluorosilicone compositions of Comparative Examples 1 and 2, which use linear silicone (B-4) whose side chains are hydrogen-modified with the organosilicon compound according to the first embodiment of the present invention have poor curability (slightly slow curing) and also have poor mechanical strength.
- the liquid addition-curable fluorosilicone composition of the first aspect of the present invention is suitable as a material for casting, compression molding, and injection molding, and can contribute to improving the productivity of molded products.
- the liquid addition-curable fluorosilicone composition of the first aspect of the present invention has a low compression set value after heat curing, and can be suitably used as rubber molded products such as sealing materials, O-rings, and packings.
- Example 5 to 8 and Comparative Example 3 the storage stability of the compositions was evaluated by the following method. After storing the composition at 30° C. for 3 days or 7 days, the composition was visually inspected to determine whether it maintained fluidity and was liquid, and whether it had gelled, and was evaluated as "good.”
- Component (A') Formula (4') below Trifluoropropylmethylpolysiloxane having a viscosity of 76.6 Pa ⁇ s at 25° C. and both ends capped with dimethylvinylsiloxy groups [vinyl group content: 4.6 ⁇ 10 ⁇ 5 mol/g]
- (B') Crosslinking agent: (B'-1) Methylhydrogenpolysiloxane represented by the following formula (6-1') [SiH group amount: 0.012 mol/g]
- Reaction inhibitor ethynylcyclohexanol
- Compression set improver benzotriazole silane represented by the following formula (7)
- Heat resistance agent cerium oxide
- Examples 5 to 8 and Comparative Example 3 A silicone rubber composition was prepared in the amounts shown in Table 2 below. The viscosity of the resulting composition was measured under the conditions described above, and a cured product was prepared and the general physical properties described above were measured. The results are shown in Table 2.
- liquid addition-curable fluorosilicone compositions of Examples 5 to 7, which are examples of the second aspect of the present invention cure much faster than the compositions of Comparative Example 3 and Example 8, and the cured products of these compositions have better tensile strength and elongation at break than the cured products of the compositions of Comparative Example 3 and Example 8.
- the fluorosilicone composition of Comparative Example 3 which uses a silicone whose side chains are hydrogen-modified with an organosilicon compound of the second aspect of the present invention and does not contain SiO 4/2 units, cures somewhat slowly, and the cured products of these compositions also have inferior mechanical strength.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention is suitable as a material for casting, compression molding, and injection molding, and can contribute to improving the productivity of molded products.
- the liquid addition-curable fluorosilicone composition of the second aspect of the present invention has a low compression set value after heat curing, and can be suitably used as rubber molded products such as sealing materials, O-rings, and packings.
- the present invention is not limited to the above-described embodiments.
- the above-described embodiments are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present invention and provides similar effects is included within the technical scope of the present invention.
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Abstract
Description
で示される、25℃の粘度が100~500,000mPa・sであるビニル基含有オルガノポリシロキサン、
(B)ケイ素原子結合水素原子を1分子中に3個以上有する下記式(3)
で示される分岐状オルガノハイドロジェンポリシロキサン:(B)成分中のケイ素原子に結合した水素原子の数が前記組成物中のケイ素原子結合ビニル基1個当たり0.5~10となる量、
(C)付加反応触媒:触媒量、及び
(D)下記一般式(2)で示される有機ケイ素化合物で表面処理した補強性シリカ充填剤
を含有し、
前記付加硬化型フルオロシリコーン組成物が23℃で液状であることを特徴とする付加硬化型フルオロシリコーン組成物を提供する。
液状付加硬化型フルオロシリコーン組成物であって、
(A’)下記一般式(1A)
で示される、25℃の粘度が100~500,000mPa・sであるアルケニル基含有オルガノポリシロキサン、
(B’)下記一般式(2A)
で示される、ケイ素原子結合水素原子を1分子中に3~5個有するオルガノハイドロジェンポリシロキサン:(B’)成分中のケイ素原子に結合した水素原子の数が前記組成物中のケイ素原子結合アルケニル基1個当たり0.5~10となる量、
(C’)付加反応触媒:触媒量、及び
(D’)下記一般式(3A)で示される有機ケイ素化合物で表面処理した補強性シリカ充填剤
を含有するものであることを特徴とする、23℃で液状である、付加硬化型フルオロシリコーン組成物を提供する。
(A)下記一般式(1)
で示される、25℃の粘度が100~500,000mPa・sであるビニル基含有オルガノポリシロキサン、
(B)ケイ素原子結合水素原子を1分子中に3個以上有する下記式(3)
で示される分岐状オルガノハイドロジェンポリシロキサン:(B)成分中のケイ素原子に結合した水素原子の数が前記組成物中のケイ素原子結合ビニル基1個当たり0.5~10となる量、
(C)付加反応触媒:触媒量、及び
(D)下記一般式(2)で示される有機ケイ素化合物で表面処理した補強性シリカ充填剤
を含有し、
前記付加硬化型フルオロシリコーン組成物が23℃で液状であることを特徴とする付加硬化型フルオロシリコーン組成物である。
液状付加硬化型フルオロシリコーン組成物であって、
(A’)下記一般式(1A)
で示される、25℃の粘度が100~500,000mPa・sであるアルケニル基含有オルガノポリシロキサン、
(B’)下記一般式(2A)
で示される、ケイ素原子結合水素原子を1分子中に3~5個有するオルガノハイドロジェンポリシロキサン:(B’)成分中のケイ素原子に結合した水素原子の数が前記組成物中のケイ素原子結合アルケニル基1個当たり0.5~10となる量、
(C’)付加反応触媒:触媒量、及び
(D’)下記一般式(3A)で示される有機ケイ素化合物で表面処理した補強性シリカ充填剤
を含有するものであることを特徴とする、23℃で液状である、付加硬化型フルオロシリコーン組成物である。
本発明の第1態様の付加硬化型フルオロシリコーン組成物は、(A)特定の25℃の粘度が100~500,000mPa・sであるビニル基含有オルガノポリシロキサン、(B)ケイ素原子結合水素原子を1分子中に3個以上有する特定の分岐状オルガノハイドロジェンポリシロキサン、(C)付加反応触媒、及び(D)特定の有機ケイ素化合物で表面処理した補強性シリカ充填剤を含有し、23℃で液状であることを特徴とする。前記組成物は上記(A)~(D)成分以外の成分を更に含んでもよい。以下、これら成分について説明する。
(A)成分は、下記一般式(1)で示される25℃の粘度が100~500,000mPa・sであるオルガノポリシロキサンである。
CkF2k+1- (kは1~10の整数)
が例示される。また、上記パーフルオロポリエーテル基としては下記式
が例示される。
(B)成分は、ケイ素原子結合水素原子を1分子中に3個以上有する下記式(3)で示される分岐状オルガノハイドロジェンポリシロキサンである。該オルガノハイドロジェンポリシロキサンは、(A)成分とヒドロシリル化付加反応し、硬化剤(架橋剤)として作用する。(B)成分の分子構造は、末端ハイドロジェン変性の分岐状シロキサンであり、該オルガノハイドロジェンシロキサンを含むことにより、フルオロシリコーン組成物は速硬化し、そのフルオロシリコーンゴム硬化物は高強度化することが可能になる。
また、Rf-X基としては、CkF2k+1-CH2CH2基(kは1~10の整数)が好ましく、3,3,3-トリフルオロプロピル基(kは1)がより好ましい。
なお、(B)成分は1種単独でも2種以上を併用してもよい。
さらに、上記式(3)で示される分岐状オルガノハイドロジェンポリシロキサンは、分子中に水酸基及び/またはアルコキシ基を含んでいてもよい。具体的には、水酸基及び/ または炭素数1から6のアルコキシ基を上記オルガノポリシロキサンの全置換基中の20モル%以下の範囲内で含んでいてもよい。炭素数1から6のアルコキシ基の具体例としては、メトキシ基、エトキシ基、n-プロポキシ基、イソプロポキシ基、n-ブトキシ基、イソブトキシ基、t-ブトキシ基、ペンチルオキシ基、ネオペンチルオキシ基、ヘキシルオキシ基などが挙げられ、特にメトキシ基、エトキシ基、イソプロポキシ基が挙げられる。
(C)成分の付加反応触媒は、前記組成物中のビニル基と(B)成分中のケイ素原子に結合した水素原子との付加反応を促進するものであればいかなる触媒であってもよい。通常は、白金族金属系触媒が好適に使用できる。例えば、白金、パラジウム、ロジウム等や塩化白金酸、アルコール変性塩化白金酸、塩化白金酸とオレフィン類、ビニルシロキサン又はアセチレン化合物との配位化合物、テトラキス(トリフェニルホスフィン)パラジウム、クロロトリス(トリフェニルホスフィン)ロジウム等の、白金族金属又はそれらの化合物が挙げられるが、特に好ましくは白金系化合物である。(C)成分は、1種単独で用いても2種以上を併用してもよい。
(D)成分は、下記式(2)で表される分子鎖両末端にシラノール基を有する直鎖状有機ケイ素化合物で表面処理した補強性シリカである。
上記補強性シリカ充填剤としては、従来からシリコーンゴム組成物に使用されているものを用いることができ、沈澱シリカ(湿式シリカ)、ヒュームドシリカ(乾式シリカ)、焼成シリカ等が好適である。特にはヒュームドシリカが好適である。
本発明の第1態様の液状付加硬化型フルオロシリコーン組成物は、前記(A)~(D)成分以外のその他の成分を必要に応じて含有してもよい。その他の成分とは例えば、カーボンブラック、導電性亜鉛華、金属粉等の導電剤、窒素含有化合物、エチニルシクロヘキサノールなどのアセチレン化合物、リン化合物、ニトリル化合物、カルボキシレート、錫化合物、水銀化合物、硫黄化合物等のヒドロシリル化反応制御剤、酸化鉄、酸化セリウムのような耐熱性付与剤、トリアゾール化合物、ベンゾトリアゾールシランなどのベンゾトリアゾール誘導体等の圧縮永久ひずみ向上剤、ジメチルシリコーンオイル等の内部離型剤、接着性付与剤、チクソ性付与剤等が挙げられる。ただし、本発明の第1態様の液状付加硬化型フルオロシリコーン組成物は一分子中にトリアルコキシ基を3個有するイソシアヌル酸誘導体を含有しない。
[液状付加硬化型フルオロシリコーン組成物]
本発明の第2態様の液状付加硬化型フルオロシリコーン組成物は、概して、(A’)アルケニル基含有オルガノポリシロキサンと、(B’)オルガノハイドロジェンポリシロキサンと、(C’)付加反応触媒と、(D’)補強性シリカ充填剤とを含む。
(A’)成分は、下記一般式(1A)で示される25℃の粘度が100~500,000mPa・sであるアルケニル基(ビニル基)含有オルガノポリシロキサンである。
で示されるパーフルオロアルキル基含有オルガノポリシロキサンである。
CkF2k+1- (kは1~10の整数である)
が例示される。
(B’)成分であるオルガノハイドロジェンポリシロキサンは、下記式(2A)
で示される、ケイ素原子結合水素原子を1分子中に3~5個有するオルガノハイドロジェンポリシロキサンである。
で示される、ケイ素原子結合水素原子を1分子中に3~5個有するオルガノハイドロジェンポリシロキサンである。
(C’)成分の付加反応触媒は、(A’)成分中のアルケニル基(ビニル基)と(B’)成分中のケイ素原子に結合した水素原子との付加反応を促進するものであればいかなる触媒であってもよい。通常は、白金族金属系触媒が好適に使用できる。例えば、白金、パラジウム、ロジウム等や塩化白金酸、アルコール変性塩化白金酸、塩化白金酸とオレフィン類、ビニルシロキサン又はアセチレン化合物との配位化合物、テトラキス(トリフェニルホスフィン)パラジウム、クロロトリス(トリフェニルホスフィン)ロジウム等の、白金族金属又はそれらの化合物が挙げられるが、特に好ましくは白金系化合物である。
本発明の第2態様の液状付加硬化型フルオロシリコーン組成物は、前記(A’)~(D’)成分以外のその他の成分を必要に応じて含有してもよい。配合量は特に限定されない。
本発明の第2態様の液状付加硬化型フルオロシリコーン組成物は、例えば、上記(A’)~(D’)成分、及び必要に応じて各任意成分を、ニーダー、プラネタリーミキサーなどの通常の混合撹拌器、混練器等を用いて上記各成分を均一に混合することにより調製することができる。
本発明の第2態様の組成物は23℃で液状であることが特徴である。作業性等の点から、23℃において、せん断速度10s-1での粘度が1,500Pa・s以下であることが好ましく、より好ましくは100~1,200Pa・s、更に好ましくは200~1,100Pa・sである。この粘度が1,500Pa・s以下であれば、注入、圧縮及び射出成形を行う際に材料供給にあまり時間がかからず、高い生産性を提供できる。なお、本発明の第2態様において、上記せん断速度下での粘度の測定は、精密回転式粘度計(Thermo Fisher Scientific製)を用いて行ったものである。
フルオロシリコーンゴムは、本発明の第2態様の付加硬化型フルオロシリコーン組成物の硬化物である。
組成物を150℃/10分のプレスキュアを行ったものに更に200℃/4時間、恒温槽で2次加硫(ポストキュア)した。得られた硬化物について、JIS K 6249:2003の記載に基づき、硬さ(タイプAデュロメータ硬さ)、引張強さ、切断時伸び、及び引裂強さ(アングル)を測定した。
組成物を150℃/15分にて硬化(プレスキュア)し、更に200℃/4時間、恒温槽で2次加硫(ポストキュア)した。得られた硬化物について、JIS K 6249:2003の記載に基づき圧縮率25%で180℃×22時間圧縮後の圧縮永久ひずみを測定した。
下記実施例1~4、並びに比較例1及び2で使用した各成分は以下の通りである。
(A)成分:下記式(4)
(B-1)下記式(6―1)で示されるメチルハイドロジェンポリシロキサン[SiH基量:0.0086mol/g]
(A)上記式(4)で示されるトリフルオロプロピルメチルポリシロキサン[ビニル基含有量4.6×10-5mol/g]55質量部、補強性シリカ充填剤として上記ヒュームドシリカ40質量部、上記式(5)で示される有機ケイ素化合物6質量部、水0.5質量部、及び、1,3-ジビニル-1,1,3,3-テトラメチルジシラザン0.4質量部を25℃で30分混合後、160℃に昇温し、3時間攪拌を続けた。さらに上記式(4)で表されるトリフルオロプロピルメチルポリシロキサン60質量部を添加し、30分混合後、シリコーンゴムベースA1を得た。なお、得られたシリコーンゴムベース中、(A)成分100質量部あたりの(D)成分の量は35質量部である。
下記表1に示す配合量でシリコーンゴム組成物を調製した。得られた組成物は、上記条件にて粘度を測定し、硬化物を作製して上記一般物性を測定した。これらの結果を表1に記載した。なお、表中の「硬化性T10/T90」の欄では、上記測定方法により求めた10%、90%硬化時間(秒)をそれぞれ示し、「硬化性T90-T10」の欄ではその差を示した。この差が小さいほど硬化が速い。また、「SiH/SiVi」は組成物中のSiVi基に対する(B)成分中のSiH基の個数比である。
実施例5~8、及び比較例3では、組成物の保存安定性は以下の方法で評価した。
組成物を30℃×3日後、又は30℃×7日後において、目視確認により流動性を維持し液状であるものを○、ゲル化してしまったものを×とした。
(A’)上記式(4’)で示されるトリフルオロプロピルメチルポリシロキサン[ビニル基含有量4.6×10-5mol/g]55質量部、補強性シリカ充填剤として上記ヒュームドシリカ40質量部、上記式(5’)で示される有機ケイ素化合物6質量部、水0.5質量部、及び、1,3-ジビニル-1,1,3,3-テトラメチルジシラザン0.4質量部を、25℃で30分混合後、160℃に昇温し、3時間攪拌を続けた。さらに上記式(4’)で表されるトリフルオロプロピルメチルポリシロキサン60質量部を添加し、30分混合後、シリコーンゴムベースA1’を得た。なお、得られたシリコーンゴムベース中、(A’)成分100質量部あたりの(D’)成分の量は35質量部である。
下記表2に示す配合量でシリコーンゴム組成物を調製した。得られた組成物は、上記条件にて粘度を測定し、硬化物を作成して上記一般物性を測定した。これらの結果を表2に記載した。
Claims (5)
- 付加硬化型フルオロシリコーン組成物であって、
(A)下記一般式(1)
(式中、R1は互いに独立に、炭素数1~8のアルキル基、炭素数6~12のアリール基、炭素数7~12のアラルキル基から選ばれる基であり、Rfは互いに独立に、炭素数1~10のパーフルオロアルキル基、及び炭素数3~30のパーフルオロポリエーテル基から選ばれる基であり、Xは2価の有機基であり、mは0~100の整数であり、nは1~800の整数であり、ただし、5≦m+n≦800である。)
で示される、25℃の粘度が100~500,000mPa・sであるビニル基含有オルガノポリシロキサン、
(B)ケイ素原子結合水素原子を1分子中に3個以上有する下記式(3)
(上記式(3)中、R4は互いに独立に、炭素数1~8のアルキル基、炭素数6~12のアリール基、または炭素数7~12のアラルキル基から選ばれる基であり、Rfは互いに独立に、炭素数1~10のパーフルオロアルキル基、及び炭素数3~30のパーフルオロポリエーテル基から選ばれる基であり、Xは2価の有機基である。x1は2≦x1≦4の数、x2は0≦x2≦20の整数、x3は0≦x3≦20の整数であり、0≦x2+x3≦20を満たし、y1は0≦y1≦30の整数、z1は0≦z1≦10の整数、y2は0≦y2≦30の整数であり、z2は0≦z2≦10の整数であり、z1+z2>0である。)
で示される分岐状オルガノハイドロジェンポリシロキサン:(B)成分中のケイ素原子に結合した水素原子の数が前記組成物中のケイ素原子結合ビニル基1個当たり0.5~10となる量、
(C)付加反応触媒:触媒量、及び
(D)下記一般式(2)で示される有機ケイ素化合物で表面処理した補強性シリカ充填剤
(上記式(2)中、R3は互いに独立に、炭素数1~8のアルキル基、炭素数6~12のアリール基、炭素数7~12のアラルキル基から選ばれる基であり、R2は互いに独立に、上記R3で示される基、又は3,3,3-トリフルオロプロピル基であり、ただし、R2の少なくとも1個は3,3,3-トリフルオロプロピル基であり、pは1≦p≦20の整数である。):(A)成分100質量部に対し10~60質量部
を含有し、
前記付加硬化型フルオロシリコーン組成物が23℃で液状であることを特徴とする付加硬化型フルオロシリコーン組成物。 - 請求項1に記載の付加硬化型フルオロシリコーン組成物の硬化物であることを特徴とするフルオロシリコーンゴム。
- 請求項2に記載のフルオロシリコーンゴムの成形体であることを特徴とするフルオロシリコーンゴム成形品。
- 液状付加硬化型フルオロシリコーン組成物であって、
(A’)下記一般式(1A)
(式中、R1は、互いに独立に、炭素数1~8のアルキル基、炭素数6~12のアリール基、又は炭素数7~12のアラルキル基から選ばれる基であり、Rfは、互いに独立に、炭素数1~10のパーフルオロアルキル基、又は3~30のパーフルオロポリエーテル基から選ばれる基であり、Xは2価の有機基であり、mは0~100の整数であり、nは1~800の整数であり、ただし、5≦m+n≦800である)
で示される、25℃の粘度が100~500,000mPa・sであるアルケニル基含有オルガノポリシロキサン、
(B’)下記一般式(2A)
(上記式(2A)中、R4は、互いに独立に、炭素数1~8のアルキル基、炭素数6~12のアリール基、または炭素数7~12のアラルキル基から選ばれる基であり、Rf’は、互いに独立に、炭素数1~10のパーフルオロアルキル基、または3~30のパーフルオロポリエーテル基から選ばれる基であり、Xは2価の有機基である。x1’は3≦x1’≦5の整数であり、x2’及びx3’は0≦x2’+x3’≦20の整数であり、y1’は0≦y1’≦30の整数であり、y2’は0≦y2’≦30の整数であり、z1’は0≦z1’≦10の整数であり、z2’は0≦z2’≦10の整数であり、wは0<w≦10であり、ただし、x2’、x3’、y1’、y2’、z1’及びz2’は同時に0とならない。)
で示される、ケイ素原子結合水素原子を1分子中に3~5個有するオルガノハイドロジェンポリシロキサン:(B’)成分中のケイ素原子に結合した水素原子の数が前記組成物中のケイ素原子結合アルケニル基1個当たり0.5~10となる量、
(C’)付加反応触媒:触媒量、及び
(D’)下記一般式(3A)で示される有機ケイ素化合物で表面処理した補強性シリカ充填剤
(上記式(3A)中、R3は、互いに独立に、炭素数1~8のアルキル基、炭素数6~12のアリール基、又は炭素数7~12のアラルキル基から選ばれる基であり、R2は、互いに独立に、上記R3で示される基、又は3,3,3-トリフルオロプロピル基であり、ただし、R2の少なくとも1個は3,3,3-トリフルオロプロピル基であり、pは1≦p≦20の整数である):(A’)成分100質量部に対し10~60質量部
を含有するものであることを特徴とする、23℃で液状である、付加硬化型フルオロシリコーン組成物。 - 請求項4記載の付加硬化型フルオロシリコーン組成物の硬化物であることを特徴とするフルオロシリコーンゴム。
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| KR1020257010793A KR20250081864A (ko) | 2022-10-07 | 2023-09-11 | 액상 부가경화형 플루오로실리콘 조성물, 플루오로실리콘 고무 및 성형품 |
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| WO2017183541A1 (ja) * | 2016-04-22 | 2017-10-26 | 東レ・ダウコーニング株式会社 | 高誘電性フィルム、その用途および製造方法 |
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2023
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- 2023-09-11 EP EP23874601.0A patent/EP4600310A1/en active Pending
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| JP2013047290A (ja) | 2011-08-29 | 2013-03-07 | Shin-Etsu Chemical Co Ltd | 液状付加硬化型フロロシリコーンゴム組成物及びその成形品 |
| WO2014020920A1 (ja) * | 2012-08-02 | 2014-02-06 | モメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社 | 熱硬化性シリコーンゴム組成物 |
| JP2016503108A (ja) * | 2012-12-28 | 2016-02-01 | ダウ コーニング コーポレーションDow Corning Corporation | トランスデューサーのための硬化性オルガノポリシロキサン組成物及びかかる硬化性シリコーン組成物のトランスデューサーへの使用 |
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| CN111808430A (zh) * | 2020-08-24 | 2020-10-23 | 浙江新安化工集团股份有限公司 | 一种氟硅混炼胶及其制备方法 |
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