WO2023140229A1 - プレポリマー組成物、ポリウレタン樹脂、弾性成形品、および、プレポリマー組成物の製造方法 - Google Patents
プレポリマー組成物、ポリウレタン樹脂、弾性成形品、および、プレポリマー組成物の製造方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/757—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing at least two isocyanate or isothiocyanate groups linked to the cycloaliphatic ring by means of an aliphatic group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/16—Catalysts
- C08G18/22—Catalysts containing metal compounds
- C08G18/24—Catalysts containing metal compounds of tin
- C08G18/244—Catalysts containing metal compounds of tin tin salts of carboxylic acids
- C08G18/246—Catalysts containing metal compounds of tin tin salts of carboxylic acids containing also tin-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
Definitions
- the present invention relates to prepolymer compositions, polyurethane resins, elastic molded articles, and methods for producing prepolymer compositions.
- a polyurethane resin has, for example, soft segments formed by the reaction of polyisocyanate and macropolyol, and hard segments formed by the reaction of polyisocyanate and a chain extender.
- polyurethane resins obtained by the following methods are known. That is, first, 1,4-bis(isocyanatomethyl)cyclohexane (H 6 XDI) is reacted with a polycarbonate diol (PCD2) containing 3-methyl-1,5-pentanediol and 1,6-hexanediol as structural units to obtain a urethane prepolymer. Next, the urethane prepolymer and 1,4-butanediol are reacted to obtain a polyurethane resin (see, for example, Patent Document 1 (Example 2)).
- Patent Document 1 Example 2
- the polyurethane resin described in Patent Document 1 does not have sufficient crack growth resistance. Therefore, polyurethane resins are required to have excellent crack growth resistance in addition to excellent mechanical properties.
- the present invention provides a prepolymer composition from which a polyurethane resin having excellent crack growth resistance and mechanical properties can be obtained, a polyurethane resin obtained using the prepolymer composition, an elastic molded article containing the polyurethane resin, and a method for producing the prepolymer composition.
- the present invention [1] is a prepolymer composition containing an isocyanate group-terminated prepolymer, wherein the isocyanate group-terminated prepolymer is a reaction product of a polyisocyanate component containing 1,4-bis(isocyanatomethyl)cyclohexane and a polyol component containing a polycarbonate polyol, the 1,4-bis(isocyanatomethyl)cyclohexane contains a trans form at a rate of 60 mol% or more, and the viscosity of the polycarbonate polyol at 80 ° C. (V 1 ) is 4000 mPa s or less, and the viscosity of the prepolymer composition at 80° C. (V 2 ) is 4000 mPa ⁇ s or less, and the isocyanate group concentration of the prepolymer composition is 8.0% by mass or more and less than 13.0% by mass.
- the present invention [2] includes the prepolymer composition according to [1] above, wherein the prepolymer composition contains the isocyanate group-terminated prepolymer and an isocyanate monomer containing 1,4-bis(isocyanatomethyl)cyclohexane.
- the present invention [3] includes a polyurethane resin containing a reaction product of the prepolymer composition described in [1] or [2] above and a chain extender.
- the present invention [4] includes an elastic molded article containing the polyurethane resin described in [3] above.
- the present invention [5] comprises a preparation step of preparing a polyisocyanate component containing 1,4-bis(isocyanatomethyl)cyclohexane and a polyol component containing polycarbonate polyol, and a prepolymer preparation step of reacting the polyisocyanate component and the polyol component at a ratio (NCO/OH) equivalent of isocyanate groups in the polyisocyanate component to hydroxyl groups in the polyol component exceeding 1.0 to prepare a reaction product solution containing an isocyanate group-terminated prepolymer.
- the 1,4-bis(isocyanatomethyl)cyclohexane contains a trans isomer at a rate of 60 mol% or more, and the viscosity of the polycarbonate polyol at 80 ° C. (V 1 ) is 4000 mPa s or less, and the viscosity of the prepolymer composition at 80° C. (V 2 ) is 4000 mPa s or less, and the viscosity of the polycarbonate polyol at 80 ° C. (V 1 ) of the prepolymer composition at 80° C. (V 2 ) increase rate (V 2 /V 1 ) is 2.0 or less, and the isocyanate group concentration of the prepolymer composition is 8.0% by mass or more and less than 13.0% by mass.
- 1,4-bis(isocyanatomethyl)cyclohexane contained in the polyisocyanate component contains a trans isomer in a relatively high proportion, and polycarbonate polyol contained in the polyol component has a relatively low viscosity. Additionally, the prepolymer composition has a relatively low viscosity. Additionally, the prepolymer composition has a range of concentrations of isocyanate groups. With such a prepolymer composition, it is possible to obtain a polyurethane resin having excellent crack growth resistance and mechanical properties.
- the polyurethane resin and elastic molded article of the present invention are obtained using the above prepolymer composition, they have excellent crack propagation resistance and excellent mechanical properties.
- the above prepolymer composition can be obtained.
- the prepolymer composition of the present invention contains an isocyanate group-terminated prepolymer.
- the isocyanate group-terminated prepolymer is the reaction product of the polyisocyanate component and the polyol component.
- the prepolymer composition of the present invention and the method for producing the same are described in detail below.
- a polyisocyanate component and a polyol component are prepared (preparation step).
- the polyisocyanate component contains 1,4-bis(isocyanatomethyl)cyclohexane (1,4-H 6 XDI) as an essential component.
- 1,4-bis(isocyanatomethyl)cyclohexane has cis-1,4-bis(isocyanatomethyl)cyclohexane and trans-1,4-bis(isocyanatomethyl)cyclohexane as stereoisomers. That is, bis(isocyanatomethyl)cyclohexane preferably contains cis-1,4-bis(isocyanatomethyl)cyclohexane and trans-1,4-bis(isocyanatomethyl)cyclohexane.
- cis-1,4-bis(isocyanatomethyl)cyclohexane may be referred to as cis-1,4-isomer.
- trans-1,4-bis(isocyanatomethyl)cyclohexane is sometimes referred to as trans-1,4-isomer.
- the total amount of trans-1,4-isomer and cis-1,4-isomer is 100 mol %.
- 1,4-bis(isocyanatomethyl)cyclohexane contains a trans-1,4-isomer.
- the trans-1,4 content is 60 mol% or more, preferably 70 mol% or more, more preferably 80 mol% or more, and still more preferably 85 mol% or more.
- the trans-1,4 content is, for example, 100 mol% or less, preferably 99.8 mol% or less, more preferably 99 mol% or less, still more preferably 96 mol% or less, and particularly preferably 90 mol% or less.
- the content of cis-1,4 is, for example, 0 mol% or more, preferably 0.2 mol% or more, more preferably 1 mol% or more, still more preferably 4 mol% or more, and particularly preferably 10 mol% or more.
- the content of cis-1,4-isomer is 40 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, still more preferably 15 mol% or less.
- 1,4-bis(isocyanatomethyl)cyclohexane may be modified as long as it does not impair the excellent effects of the present invention.
- Modified compounds include, for example, uretdione modified products, isocyanurate modified products, iminooxadiazinedione modified products, biuret modified products, allophanate modified products, polyol adducts, oxadiazinetrione modified products and carbodiimide modified products.
- 1,4-bis(isocyanatomethyl)cyclohexane is a monomer (a monomer of 1,4-bis(isocyanatomethyl)cyclohexane) rather than a modified form.
- polyisocyanate component can contain other polyisocyanates as optional components within a range that does not impair the excellent effects of the present invention.
- polyisocyanates are polyisocyanates other than 1,4-bis(isocyanatomethyl)cyclohexane.
- Other polyisocyanates more specifically include aliphatic polyisocyanates, alicyclic polyisocyanates (excluding 1,4-bis(isocyanatomethyl)cyclohexane), aromatic polyisocyanates, and araliphatic polyisocyanates.
- aliphatic polyisocyanates include pentamethylene diisocyanate (PDI) and hexamethylene diisocyanate (HDI).
- Alicyclic polyisocyanates include, for example, 1,3-bis(isocyanatomethyl)cyclohexane (1,3-H 6 XDI), isophorone diisocyanate (IPDI), norbornene diisocyanate (NBDI), and methylenebis(cyclohexylisocyanate) (H 12 MDI).
- Aromatic polyisocyanates include, for example, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), toluidine diisocyanate (TODI), and naphthalene diisocyanate (NDI).
- Aroaliphatic polyisocyanates include, for example, xylylene diisocyanate (XDI) and tetramethylxylylene diisocyanate (TMXDI). Further, the other polyisocyanate may be the above-described modified product as long as it does not impair the excellent effects of the present invention. These can be used alone or in combination of two or more.
- the content of other polyisocyanates is, for example, 50% by mass or less, preferably 30% by mass or less, more preferably 10% by mass or less, and particularly preferably 0% by mass, relative to the total amount of polyisocyanate components.
- the content of bis(isocyanatomethyl)cyclohexane is, from the viewpoint of mechanical properties, for example, 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, and particularly preferably 100% by mass, based on the total amount of the polyisocyanate component.
- the polyisocyanate component preferably consists of 1,4-bis(isocyanatomethyl)cyclohexane.
- the polyol component contains a relatively low-viscosity polycarbonate polyol (hereinafter referred to as low-viscosity polycarbonate polyol) as an essential component.
- a relatively low viscosity means that the viscosity (V 1 ) at 80° C. is 4000 mPa ⁇ s or less. That is, the polyol component contains a polycarbonate polyol having a viscosity (V 1 ) at 80° C. of 4000 mPa ⁇ s or less.
- a low-viscosity polycarbonate polyol contains, for example, a structural unit represented by the following formula (1).
- R 1 represents a linear alkylene group having 5 or more carbon atoms, a branched alkylene group having 3 or more carbon atoms, or a polyoxyalkylene group.
- R 1 represents a linear alkylene group having 5 or more carbon atoms, a branched alkylene group having 3 or more carbon atoms, or a polyoxyalkylene group.
- straight-chain alkylene groups having 5 or more carbon atoms include straight-chain alkylene groups having 5 to 20 carbon atoms.
- Linear alkylene groups having 5 to 20 carbon atoms include, for example, n-pentylene, n-hexylene, n-heptylene, n-octylene, n-nonylene, n-decylene, n-undecylene, n-dodecylene, n-tridecylene, n-tetradecylene, n-pentadecylene, n-hexadecylene, n-heptadecylene, n-octadecylene, n-nonadecylene and Examples include n-icosylene. These are used singly or in combination of two or more.
- Examples of branched alkylene groups having 3 or more carbon atoms include branched alkylene groups having 3 to 20 carbon atoms.
- Examples of branched alkylene groups having 3 to 20 carbon atoms include 1,2-propylene, 1-methyl-1,3-propylene, 2-methyl-1,3-propylene, 1,1-dimethyl-1,3-propylene, 1,2-dimethyl-1,3-propylene, 1,3-dimethyl-1,3-propylene, 2,2-dimethyl-1,3-propylene, 1,2,3-trimethyl-1,3-propylene, 1,1,2-trimethyl-1,3-propylene, 1,2,2-trimethyl-1,3-propylene, 1,1,3-trimethyl-1,3-propylene, 1-methyl-1,4-butylene, 2-methyl-1,4-butylene, 1,1-dimethyl-1,4-butylene, 1,2-dimethylbutylene, 1,3-dimethyl-1,4-butylene, 1,4-dimethyl-1,4
- examples of oxyalkylene include oxyalkylene having 2 to 4 carbon atoms.
- examples of oxyalkylene having 2 to 4 carbon atoms include oxyethylene, oxypropylene (oxy-1,2-propylene), oxytrimethylene (oxy-1,3-propylene) and oxytetramethylene.
- Examples of polyoxyalkylene groups composed of oxyalkylenes having 2 to 4 carbon atoms include polyoxyethylene, polyoxypropylene, polyoxyethylene/propylene (random and/or block copolymers), polyoxytrimethylene and polyoxytetramethylene (PTM). These are used singly or in combination of two or more.
- the number of repeating units of oxyalkylene is appropriately set so that the viscosity of the low-viscosity polycarbonate polyol falls within the range described later. More specifically, the number of repeating units of oxyalkylene is, for example, 2 or more, preferably 3 or more. Further, the number of repeating units of oxyalkylene is, for example, 60 or less, preferably 50 or less.
- the number average molecular weight of the polyoxyalkylene group (polystyrene equivalent molecular weight by GPC measurement) is appropriately set so that the viscosity of the low-viscosity polycarbonate polyol falls within the range described below. More specifically, the polyoxyalkylene group has a number average molecular weight (polystyrene equivalent molecular weight by GPC measurement) of, for example, 150 or more, preferably 250 or more. Also, the number average molecular weight of the polyoxyalkylene group (polystyrene equivalent molecular weight by GPC measurement) is, for example, 4000 or less, preferably 3000 or less.
- R 1 is used alone or in combination of two or more.
- a polycarbonate polyol having one type of R1 in one molecule can be used alone.
- a polycarbonate polyol having two or more types of R1 in one molecule can be used alone.
- two or more types of low-viscosity polycarbonate polyols can be used in combination (for example, mixed use).
- R 1 in the above formula (1) preferably includes a branched alkylene group having 3 or more carbon atoms or a linear polyoxyalkylene group having 2 or more carbon atoms.
- the content ratio of the structural unit represented by the above formula (1) is appropriately adjusted so that the viscosity falls within the range described later.
- the low-viscosity polycarbonate polyol can also contain a structural unit represented by the following formula (2), if necessary, within a range that satisfies the viscosity (V 1 ) described later.
- R 2 represents a linear alkylene group having 4 or less carbon atoms or a cyclic alkylene group having 3 or more carbon atoms.
- R 2 represents a linear alkylene group having 4 or less carbon atoms or a cyclic alkylene group having 3 or more carbon atoms.
- straight-chain alkylene groups having 4 or less carbon atoms include straight-chain alkylene groups having 1 to 4 carbon atoms.
- Linear alkylene groups having 1 to 4 carbon atoms include, for example, methylene, ethylene, 1,3-propylene and 1,4-butylene. These can be used alone or in combination of two or more.
- the cyclic alkylene group having 3 or more carbon atoms includes, for example, a cycloalkylene group having 3 to 8 carbon atoms.
- Cycloalkylene groups having 3 to 8 carbon atoms include, for example, cyclopropylene, cyclobutylene, cyclopentylene, cyclohexylene, cycloheptylene and cyclooctylene. These can be used alone or in combination of two or more.
- the content ratio of the structural unit represented by the above formula (2) is appropriately adjusted so that the viscosity falls within the range described below.
- a low-viscosity polycarbonate polyol is obtained, for example, by copolymerizing an alkylene carbonate and a polyhydric alcohol containing R 1 in the above formula (1). Moreover, if necessary, a polyhydric alcohol containing R 1 in the above formula (1) and a polyhydric alcohol containing R 2 in the above formula (2) can be used in combination.
- Alkylene carbonates include, for example, ethylene carbonate, propylene carbonate and butylene carbonate. These can be used alone or in combination of two or more. Alkylene carbonate preferably includes ethylene carbonate.
- Examples of polyhydric alcohols containing R 1 in formula (1) above include dihydric alcohols containing R 1 in formula (1) above.
- Examples of the dihydric alcohol containing R 1 in the formula (1) include linear alkylenediol having 5 to 20 carbon atoms, branched alkylenediol having 3 to 20 carbon atoms, and polyoxyalkylenediol.
- Linear alkylenediols having 5 to 20 carbon atoms include, for example, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol and 1,10-decanediol.
- Branched alkylene diols having 3 to 20 carbon atoms include, for example, 1,2-propanediol, 1,3-butanediol, 2,2-dimethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,8-octanediol, 2-butyl-2-ethylpropanediol and 2,2,4-trimethyl-1,6-hexanediol.
- Polyoxyalkylene diols include, for example, polyoxyethylene glycol (PEG), polyoxypropylene glycol (PPG) and polytetramethylene ether glycol (PTMG).
- the number average molecular weight (Mn) of the polyoxyalkylenediol is appropriately set according to the purpose and application.
- the number average molecular weight (polystyrene equivalent molecular weight by GPC measurement) of the polyoxyalkylene diol is, for example, 150 or more, preferably 250 or more.
- the number average molecular weight (polystyrene equivalent molecular weight by GPC measurement) of the polyoxyalkylenediol is, for example, 4000 or less, preferably 3000 or less.
- the average number of hydroxyl groups of the low-viscosity polycarbonate polyol is, for example, 2 or more, for example, 4 or less, preferably 3 or less, and particularly preferably 2. That is, the low-viscosity polycarbonate polyol preferably includes a low-viscosity polycarbonate diol.
- the number average molecular weight (polystyrene equivalent molecular weight by GPC measurement) of the low-viscosity polycarbonate polyol is, for example, 400 or more, preferably 500 or more, more preferably 1000 or more.
- the number average molecular weight (polystyrene equivalent molecular weight by GPC measurement) of the low-viscosity polycarbonate polyol is, for example, 5000 or less, preferably 4000 or less, more preferably 3000 or less.
- the viscosity of low viscosity polycarbonate polyols is relatively low. More specifically, the viscosity (V 1 ) of the low-viscosity polycarbonate polyol at 80° C. is 4000 mPa ⁇ s or less, preferably 3000 mPa ⁇ s or less, more preferably 2500 mPa ⁇ s or less, still more preferably 2000 mPa ⁇ s or less, and particularly preferably 1500 mPa ⁇ s or less. The viscosity (V 1 ) of the low-viscosity polycarbonate polyol at 80° C.
- the viscosity of the low-viscosity polycarbonate polyol is measured with a Brookfield viscometer (cone plate type) in accordance with the examples described later.
- V 1 viscosity (V 1 ) at 80° C. of the low-viscosity polycarbonate polyol is within the above range and the content of the trans-1,4-isomer of 1,4-bis(isocyanatomethyl)cyclohexane is within the above range, a polyurethane resin having excellent crack propagation resistance and excellent mechanical properties can be obtained.
- the polyol component can optionally contain a relatively high-viscosity polycarbonate polyol (hereinafter referred to as high-viscosity polycarbonate polyol).
- a relatively low viscosity indicates a viscosity (V 1 ) at 80° C. exceeding 4000 mPa ⁇ s, preferably 4500 or more. That is, the polyol component can include a polycarbonate polyol having a viscosity (V 1 ) at 80° C. exceeding 4000 mPa ⁇ s.
- the high-viscosity polycarbonate polyol can contain, for example, a structural unit represented by the above formula (1), and can also contain a structural unit represented by the above formula (2).
- the content ratio of the structural unit represented by the above formula (1) is appropriately adjusted so that the viscosity (V 1 ) at 80° C. exceeds 4000 mPa ⁇ s.
- the content ratio of the structural unit represented by the above formula (2) is appropriately adjusted so that the viscosity (V 1 ) at 80° C. exceeds 4000 mPa ⁇ s.
- the content of the high-viscosity polycarbonate polyol in the polyol component is appropriately set within a range that does not impair the excellent effects of the present invention. More specifically, the content of the high-viscosity polycarbonate polyol is, for example, 30% by mass or less, preferably 20% by mass or less, more preferably 10% by mass or less, particularly preferably 0% by mass, relative to the total amount of the polyol component. That is, the polyol component particularly preferably does not contain high viscosity polycarbonate polyols.
- the polyol component can contain other polyols (polyols other than polycarbonate polyols) as optional components.
- Other polyols include, for example, other macropolyols (macropolyols other than polycarbonate polyols).
- a macropolyol is an organic compound having two or more hydroxyl groups in its molecule and having a relatively high molecular weight.
- a relatively high molecular weight indicates a number average molecular weight of 400 or more, preferably 500 or more.
- macropolyols include, for example, polyether polyols, polyester polyols, polyurethane polyols, epoxy polyols, vegetable oil polyols, polyolefin polyols, acrylic polyols, and vinyl monomer-modified polyols.
- Other macropolyols can be used alone or in combination of two or more.
- the content ratio of other macropolyols in the polyol component is appropriately set within a range that does not impair the excellent effects of the present invention. More specifically, the content of other macropolyols is, for example, 30% by mass or less, preferably 20% by mass or less, more preferably 10% by mass or less, and particularly preferably 0% by mass with respect to the total amount of polyol components. That is, the polyol component particularly preferably does not contain other macropolyols.
- the polyol component can contain a low-molecular-weight polyol as an optional component.
- Low-molecular-weight polyols are relatively low-molecular-weight organic compounds having two or more hydroxyl groups in the molecule.
- a relatively low molecular weight indicates a number average molecular weight of less than 400, preferably 300 or less. That is, the molecular weight of the low molecular weight polyol is, for example, less than 400, preferably 300 or less. Moreover, the molecular weight of the low-molecular-weight polyol is usually 40 or more.
- low-molecular-weight polyols examples include dihydric alcohols described later, trihydric alcohols described later, and tetrahydric or higher alcohols described later. These can be used alone or in combination of two or more.
- the content of the low-molecular-weight polyol in the polyol component is appropriately set within a range that does not impair the excellent effects of the present invention. More specifically, the content of the low-molecular-weight polyol is, for example, 30% by mass or less, preferably 20% by mass or less, more preferably 10% by mass or less, and particularly preferably 0% by mass, relative to the total amount of the polyol component. That is, the polyol component especially preferably does not contain low molecular weight polyols.
- the polyol component preferably consists of a low-viscosity polycarbonate polyol, particularly preferably a low-viscosity polycarbonate diol.
- prepolymer preparation step the above polyisocyanate component and the above polyol component are reacted to obtain a reaction product liquid containing an isocyanate group-terminated prepolymer (prepolymer preparation step).
- the mixing ratio of the polyisocyanate component and the polyol component is adjusted so that the isocyanate groups in the polyisocyanate component are excessive relative to the hydroxyl groups in the polyol component.
- the equivalent ratio (NCO/OH) of the isocyanate groups in the polyisocyanate component to the hydroxyl groups in the polyol component exceeds 1.0, preferably 1.1 or more, more preferably 2.0 or more, and still more preferably 3.0 or more.
- the equivalent ratio (NCO/OH) of isocyanate groups in the polyisocyanate component to hydroxyl groups in the polyol component is, for example, 5.0 or less, preferably 4.0 or less.
- reaction methods include bulk polymerization and solution polymerization.
- reaction temperature is, for example, 50° C. or higher.
- reaction temperature is, for example, 250° C. or lower, preferably 200° C. or lower.
- reaction time is, for example, 0.5 hours or longer, preferably 1 hour or longer.
- reaction time is, for example, 15 hours or less.
- reaction temperature is, for example, 50° C. or higher. Also, the reaction temperature is, for example, 120° C. or lower, preferably 100° C. or lower. Also, the reaction time is, for example, 0.5 hours or longer, preferably 1 hour or longer. Also, the reaction time is, for example, 15 hours or less.
- the above reaction is carried out until the isocyanate group concentration (NCO%) of the reaction product liquid (prepolymer composition) reaches a predetermined value (described later).
- a known urethanization catalyst may be added in the prepolymer preparation step.
- Urethane catalysts include, for example, organometallic catalysts, amine catalysts and potassium salts. These can be used alone or in combination of two or more.
- an organometallic catalyst is preferably used as the urethanization catalyst.
- organometallic catalysts examples include organotin catalysts, organolead catalysts, organonickel catalysts, organocopper catalysts and organobismuth catalysts. These can be used alone or in combination of two or more.
- the organometallic catalyst preferably includes an organotin catalyst.
- organotin catalysts include tin acetate, tin octylate, tin oleate, tin laurate, monobutyltin trioctate, dibutyltin diacetate, dimethyltin dilaurate, dibutyltin dilaurate, dibutyltin dimercaptide, dibutyltin maleate, dibutyltin dineodecanoate, dioctyltin dimercaptide, dioctyltin dilaurate, and dibutyltin. tin dichloride. These can be used alone or in combination of two or more.
- the organotin catalyst preferably includes dibutyltin dilaurate.
- the amount of the urethanization catalyst to be added is not particularly limited, and is appropriately set according to the purpose and application. Moreover, the timing of adding the urethanization catalyst is not particularly limited.
- a urethanization catalyst can be added to the polyisocyanate component and/or the polyol component in the prepolymer preparation process. Further, in the prepolymer preparation step, a urethanization catalyst can be added during mixing of the polyisocyanate component and the polyol component. Also, a urethanization catalyst can be added to the mixture (reaction mixture) of the polyisocyanate component and the polyol component.
- a plurality of these may be combined to add the urethanization catalyst at a plurality of timings.
- the method of adding the urethanization catalyst is not particularly limited, and for example, it may be added all at once or may be added in portions.
- the reaction product liquid contains, for example, an isocyanate group-terminated prepolymer that is a reaction product of a polyisocyanate component and a polyol component, and a polyisocyanate component (polyisocyanate monomer) that is an unreacted raw material.
- This reaction product liquid is a prepolymer composition containing an isocyanate group-terminated prepolymer. That is, in the prepolymer preparation step, the reaction product liquid (the reaction product liquid of the prepolymer preparation step) can be obtained as a prepolymer composition.
- the content of the isocyanate group-terminated prepolymer (reaction product) and the content of the unreacted polyisocyanate component (polyisocyanate monomer) are not particularly limited.
- the isocyanate group concentration is within the range described later. If necessary, part of the unreacted polyisocyanate component (polyisocyanate monomer) can be removed from the reaction product liquid by a known method. Moreover, an unreacted polyisocyanate component (polyisocyanate monomer) can also be added to the reaction product liquid as needed.
- the isocyanate group concentration (NCO%) is adjusted by the mixing ratio of the polyisocyanate component and the polyol component and the reaction conditions in the prepolymer preparation step.
- the isocyanate group concentration of the prepolymer composition is 8.0% by mass or more, preferably 9.0% by mass or more, more preferably 10.0% by mass or more, still more preferably 11.0% by mass or more, and particularly preferably 11.5% by mass or more.
- the isocyanate group concentration of the prepolymer composition is less than 13.0% by mass, preferably 12.9% by mass or less, more preferably 12.5% by mass or less, still more preferably 12.2% by mass or less, and particularly preferably 12.0% by mass or less, from the viewpoint of crack propagation resistance.
- the isocyanate group concentration (isocyanate group content) can be obtained by a known measuring method. Measurement methods include, for example, titration with di-n-butylamine and FT-IR analysis (same below).
- the prepolymer composition has a relatively low viscosity.
- the viscosity (V 2 ) of the prepolymer composition at 80° C. is 4000 mPa s or less, preferably 3500 mPa s or less, more preferably 3000 mPa s or less, still more preferably 2000 mPa s or less, still more preferably 1000 mPa s or less, from the viewpoint of crack propagation resistance and mechanical properties.
- the viscosity of the prepolymer composition is, for example, 10 mPa ⁇ s or more, preferably 50 mPa ⁇ s or more, more preferably 100 mPa ⁇ s or more, and still more preferably 300 mPa ⁇ s or more.
- the viscosity of the prepolymer composition is measured with a Brookfield viscometer (cone plate type) in accordance with the examples described later.
- the increase ratio (V 2 /V 1 ) of the viscosity (V 2 ) of the prepolymer composition at 80° C. to the viscosity (V 1 ) of the low-viscosity polycarbonate polyol at 80° C. is, for example, 2.0 or less, preferably 1.5 or less, more preferably 1.3 or less, further preferably 1.1 or less.
- the viscosity (V 2 ) increase ratio (V 2 /V 1 ) of the prepolymer composition at 80° C. is, for example, 1.0 or more, preferably more than 1.0, and more preferably 1.05 or more.
- the prepolymer composition can contain known additives as necessary.
- additives include antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, antiblocking agents, release agents, pigments, dyes, lubricants, fillers, hydrolysis inhibitors, rust inhibitors, and bluing agents.
- the amount and timing of addition of the additive are appropriately set according to the purpose and application.
- a prepolymer composition can be obtained.
- the 1,4-bis(isocyanatomethyl)cyclohexane contained in the polyisocyanate component contains a trans form at a relatively high proportion, and the polycarbonate polyol contained in the polyol component has a relatively low viscosity. Additionally, the prepolymer composition has a relatively low viscosity. Additionally, the prepolymer composition has a range of concentrations of isocyanate groups. With such a prepolymer composition, it is possible to obtain a polyurethane resin having excellent crack growth resistance and mechanical properties.
- the above prepolymer composition uses a low-viscosity polycarbonate polyol, and the viscosity and isocyanate group concentration of the prepolymer composition are adjusted. Therefore, by increasing the ratio of the trans isomer of 1,4-bis(isocyanatomethyl)cyclohexane, it is possible to improve the mechanical properties (for example, hardness), increase the elongation rate of the polyurethane resin, and improve the crack propagation resistance.
- a method for obtaining a polyurethane resin using the above prepolymer composition will be described in detail below.
- the above prepolymer composition and a chain extender are reacted to synthesize a polyurethane resin (chain extender step).
- a chain extender is a curing agent for the prepolymer composition.
- chain extenders include low-molecular-weight compounds containing a plurality (preferably two) of active hydrogen groups (hydroxyl group, amino group). Low molecular weight compounds more specifically include low molecular weight polyols and low molecular weight polyamines. Chain extenders preferably include low molecular weight polyols. A polyurethane resin having excellent mechanical properties can be obtained by using a low-molecular-weight polyol.
- Low-molecular-weight polyols include the above-mentioned low-molecular-weight polyols. More specifically, low-molecular-weight polyols include, for example, dihydric alcohols, trihydric alcohols, and tetrahydric or higher alcohols. Dihydric alcohols include, for example, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, diethylene glycol, triethylene glycol and dipropylene glycol.
- Trihydric alcohols include, for example, glycerin and trimethylolpropane. Tetrahydric or higher alcohols include, for example, pentaerythritol and diglycerin.
- the low-molecular-weight polyol a polymer obtained by addition-polymerizing alkylene (C2-3) oxide to a dihydric to tetrahydric alcohol so as to have a number average molecular weight of 400 or less can be mentioned. These can be used alone or in combination of two or more.
- the low-molecular-weight polyol preferably includes dihydric alcohols and trihydric alcohols, more preferably dihydric alcohols, and still more preferably 1,4-butanediol. That is, the low molecular weight polyol preferably comprises 1,4-butanediol, more preferably consists of 1,4-butanediol. Thereby, a polyurethane resin having excellent mechanical properties can be obtained.
- the equivalent ratio of active hydrogen groups in the chain extender to isocyanate groups in the prepolymer composition is, for example, 0.85 or more, preferably 0.90 or more, more preferably 0.95 or more.
- the equivalent ratio of active hydrogen groups in the chain extender to isocyanate groups in the prepolymer composition is, for example, 1.10 or less, preferably 1.20 or less, more preferably 1.10 or less, still more preferably 1.00 or less, and particularly preferably 0.98 or less.
- the prepolymer composition and the chain elongation agent are mixed in the above ratio and heated.
- the reaction temperature (curing temperature) in the chain elongation step is, for example, 100° C. or higher, preferably 110° C. or higher.
- the reaction temperature (curing temperature) in the chain elongation step is, for example, 140° C. or lower, preferably 130° C. or lower.
- the reaction time (curing time) in the chain elongation step is, for example, 10 hours or longer, preferably 12 hours or longer. Also, the reaction time (curing time) in the chain elongation step is, for example, 24 hours or less, preferably 18 hours or less.
- the above-described urethanization catalyst may be added in the chain elongation step.
- the amount of the urethanization catalyst to be added is not particularly limited, and is appropriately set according to the purpose and application.
- the timing of adding the urethanization catalyst is not particularly limited.
- a urethanization catalyst can be added to the prepolymer composition and/or the chain extender in the chain extension step.
- a urethanization catalyst can be added during mixing of the prepolymer composition and the chain elongation agent.
- a plurality of these may be combined to add the urethanization catalyst at a plurality of timings.
- the method of adding the urethanization catalyst is not particularly limited, and for example, it may be added all at once or may be added in portions.
- a polyurethane resin is obtained as a reaction product between the prepolymer composition and the chain extender.
- the polyurethane resin can contain known additives as necessary.
- additives include antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, antiblocking agents, release agents, pigments, dyes, lubricants, fillers, hydrolysis inhibitors, rust inhibitors, and bluing agents.
- the amount and timing of addition of the additive are appropriately set according to the purpose and application.
- the above polyurethane resin is obtained using the above prepolymer composition, it has excellent crack growth resistance and excellent mechanical properties. Therefore, it is suitably used as an elastic molded article (polyurethane elastomer).
- Examples of elastic molded articles include TPU (thermoplastic polyurethane elastomer) and TSU (thermosetting polyurethane elastomer).
- Polyurethane elastomers preferably include TSU (thermosetting polyurethane elastomer).
- the elastic molded product (polyurethane elastomer) is obtained as a cast polyurethane elastomer.
- Cast polyurethane elastomers are obtained, for example, by heating and curing a mixture of a prepolymer composition and a chain extender in a mold having a desired shape in a chain extension step.
- the elastic molded product (polyurethane elastomer) is heat-treated as necessary.
- the heat treatment temperature is, for example, 50° C. or higher, preferably 80° C. or higher.
- the heat treatment temperature is, for example, 200° C. or lower, preferably 150° C. or lower.
- the heat treatment time is, for example, 30 minutes or longer, preferably 1 hour or longer.
- the heat treatment time is, for example, 30 hours or less, preferably 20 hours or less.
- the elastic molded product (polyurethane elastomer) is aged as necessary.
- the aging temperature is, for example, 10° C. or higher, preferably 20° C. or higher.
- the aging temperature is, for example, 50° C. or lower, preferably 40° C. or lower.
- the aging time is, for example, 1 hour or more, preferably 10 hours or more.
- the aging time is, for example, 50 days or less, preferably 30 days or less.
- polyurethane elastomers are suitably used in various applications.
- Applications of polyurethane elastomers include, for example, transparent hard plastics, waterproof materials, potting agents, inks, binders, films, sheets, bands, belts, shoe press belts, tubes, rollers, blades, speakers, sensors, outsoles, threads, fibers, non-woven fabrics, cosmetics, shoe products, heat insulating materials, sealing materials, tape materials, sealing materials, solar power generation members, robot members, android members, wearable members, clothing items, sanitary products, cosmetic products, furniture products, food packaging members, sporting goods, leisure products, medical products, nursing care products, and housing members.
- a solution prepared by dissolving 400 parts by mass of 1,4-bis(aminomethyl)cyclohexane in 2500 parts by mass of ortho-dichlorobenzene was fed thereto by a feed pump over 60 minutes, and cold phosgenation was carried out at 30° C. or less under normal pressure. After completion of feeding, the inside of the flask became a pale brownish white slurry liquid.
- the liquid in the reactor was heated to 140° C. over 60 minutes, pressurized to 0.25 MPa, and further subjected to hot phosgenation at a pressure of 0.25 MPa and a reaction temperature of 140° C. for 2 hours. Further, 480 parts by mass of phosgene was added during the thermal phosgenation. During the process of thermal phosgenation, the liquid in the flask became a pale brown clear solution. After completion of hot phosgenation, nitrogen gas was passed through at 100 to 140° C. at 100 L/hour to degas. Next, after distilling off the solvent ortho-dichlorobenzene under reduced pressure, further rectification is performed while refluxing under conditions of 138 to 143 ° C.
- the obtained 1,4-H 6 XDI had a purity of 99.9% by gas chromatography, a hue of 5 by APHA measurement, and a trans/cis ratio of 41/59 by 13 C-NMR measurement.
- HC was 22 ppm.
- Production Example 3 (1,4-H 6 XDI, trans 86 mol%) 865 parts by mass of 1,4-H 6 XDI (93 mol% of trans isomer) of Production Example 1 and 135 parts by mass of 1,4-H 6 XDI (41 mol% of trans isomer) of Production Example 2 were placed in a four-necked flask equipped with a stirrer, a thermometer, a reflux tube, and a nitrogen inlet tube, and stirred at room temperature for 1 hour under a nitrogen atmosphere.
- the obtained 1,4-H 6 XDI had a purity of 99.9% by gas chromatography, a hue of 5 by APHA measurement, and a trans/cis ratio of 86/14 by 13 C-NMR measurement.
- HC was 19 ppm.
- Production Example 4 (1,4-H 6 XDI, trans form 65 mol%) 462 parts by mass of 1,4-H 6 XDI (93 mol% trans isomer) of Production Example 1 and 538 parts by mass of 1,4-H 6 XDI (41 mol% trans isomer) of Production Example 2 were placed in a four-necked flask equipped with a stirrer, a thermometer, a reflux tube, and a nitrogen inlet tube, and stirred at room temperature for 1 hour under a nitrogen atmosphere.
- the obtained 1,4-H 6 XDI had a purity of 99.9% by gas chromatography, a hue of 5 by APHA measurement, and a trans/cis ratio of 65/35 by 13 C-NMR measurement.
- HC was 19 ppm.
- Production Example 5 (1,4-H 6 XDI, trans form 50 mol%) 173 parts by mass of 1,4-H 6 XDI (93 mol% trans isomer) of Production Example 1 and 827 parts by mass of 1,4-H 6 XDI (41 mol% trans isomer) of Production Example 2 were placed in a four-necked flask equipped with a stirrer, a thermometer, a reflux tube, and a nitrogen inlet tube, and stirred at room temperature for 1 hour under a nitrogen atmosphere.
- the obtained 1,4-H 6 XDI had a purity of 99.9% by gas chromatography, a hue of 5 by APHA measurement, and a trans/cis ratio of 50/50 by 13 C-NMR measurement.
- HC was 19 ppm.
- Viscosity The viscosity (V 1 ) of the polycarbonate polyol at 80° C. was measured using a Brookfield viscometer (cone plate type) under the conditions of 40P cone and 188 rpm. The results are shown in Table 1. Table 1 also shows R 1 and R 2 of the structural units (formula (1) and formula (2)) contained in each polycarbonate polyol and their ratios.
- PTM (Mn250) indicates a polyoxytetramethylene group with a number average molecular weight of 250.
- the viscosity (V 2 ) of the prepolymer composition at 80° C. was measured using a Brookfield viscometer (cone plate type) under the conditions of 40P cone and 188 rpm. Also, the increase ratio (V 2 /V 1 ) of the viscosity (V 2 ) of the prepolymer composition at 80° C. to the viscosity (V 1 ) of the polycarbonate polyol at 80° C. was calculated. The results are also shown in the table.
- an initial crack of 1 mm was made with a cutter knife perpendicular to the surface direction at the end of the test piece at the center position in the length direction. Then, the upper portion of the test piece was fixed to the gripping jig of the De Mattia bending tester so that the location where the initial crack was formed was the center between the upper and lower gripping jigs. In addition, the lower part of the test piece was gripped by a gripping jig capable of reciprocating motion. Also, the distance between the upper portion fixed by the gripping jig and the lower portion gripped by the gripping jig (that is, the length of the test piece not gripped) was adjusted to about 75 mm.
- the test piece was subjected to reciprocating bending motion at a temperature of 20°C and a frequency of 5 Hz.
- the distance between the upper portion of the test piece fixed by the gripping jig and the lower portion of the test piece gripped by the gripping jig was about 17 mm.
- the value obtained by dividing the length (crack length) developed from the initial crack by the number of times of bending was calculated. Crack propagation resistance was thus evaluated.
- the prepolymer composition, polyurethane resin, elastic molded article, and method for producing the prepolymer composition of the present invention are suitably used in various industrial fields requiring polyurethane resins having excellent crack growth resistance and mechanical properties.
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Abstract
Description
(式中、R1は、炭素数5以上の直鎖状アルキレン基、炭素数3以上の分岐鎖状アルキレン基、または、ポリオキシアルキレン基を示す。)
(式中、R2は、炭素数4以下の直鎖状アルキレン基、または、炭素数3以上の環状アルキレン基を示す。)
<ポリイソシアネート成分>
製造例1(1,4-H6XDI、トランス体93モル%)
13C-NMR測定によるトランス/シス比が93/7の1,4-ビス(アミノメチル)シクロヘキサン(三菱瓦斯化学社製)を原料として、冷熱2段ホスゲン化法を加圧下で実施した。
13C-NMR測定によるトランス/シス比が41/59の1,4-ビス(アミノメチル)シクロヘキサン(東京化成工業社製)を原料として、製造例1と同様の方法にて388質量部のトランス/シス比が41/59の1,4-ビス(イソシアナトメチル)シクロヘキサンを得た。得られた1,4-H6XDIのガスクロマトグラフィー測定による純度は99.9%、APHA測定による色相は5、13C-NMR測定によるトランス/シス比は41/59であった。HCは22ppmであった。
攪拌機、温度計、還流管、および、窒素導入管を備えた4つ口フラスコに、製造例1の1,4-H6XDI(トランス体93モル%)を865質量部、製造例2の1,4-H6XDI(トランス体41モル%)を135質量部装入し、窒素雰囲気下、室温にて1時間撹拌した。得られた1,4-H6XDIのガスクロマトグラフィー測定による純度は99.9%、APHA測定による色相は5、13C-NMR測定によるトランス/シス比は86/14であった。HCは19ppmであった。
攪拌機、温度計、還流管、および、窒素導入管を備えた4つ口フラスコに、製造例1の1,4-H6XDI(トランス体93モル%)を462質量部、製造例2の1,4-H6XDI(トランス体41モル%)を538質量部装入し、窒素雰囲気下、室温にて1時間撹拌した。得られた1,4-H6XDIのガスクロマトグラフィー測定による純度は99.9%、APHA測定による色相は5、13C-NMR測定によるトランス/シス比は65/35であった。HCは19ppmであった。
攪拌機、温度計、還流管、および、窒素導入管を備えた4つ口フラスコに、製造例1の1,4-H6XDI(トランス体93モル%)を173質量部、製造例2の1,4-H6XDI(トランス体41モル%)を827質量部装入し、窒素雰囲気下、室温にて1時間撹拌した。得られた1,4-H6XDIのガスクロマトグラフィー測定による純度は99.9%、APHA測定による色相は5、13C-NMR測定によるトランス/シス比は50/50であった。HCは19ppmであった。
(1)種類
以下のポリカーボネートポリオールを準備した。
G4672;商品名デュラノールG4672(Mn=2000)、旭化成社製
T5651;商品名デュラノールT5651(Mn=1000)、旭化成社製
T5652;商品名デュラノールT5652(Mn=2000)、旭化成社製
NL2010DB;商品名ベネビオールNL2010DB(Mn=2000)、三菱ケミカル社製
NT1002;商品名ベネビオールNT1002(Mn=1000)、三菱ケミカル社製
C2090;商品名クラレポリオールC2090(Mn=2000)、クラレ社製
ポリカーボネートポリオールの80℃における粘度(V1)を、B型粘度計(コーンプレート型)を用いて、40Pコーンおよび188rpmの条件で測定した。その結果を、表1に示す。また、各ポリカーボネートポリオールに含まれる構成単位(式(1)および式(2))のR1、R2およびこれらの割合を、表1に併せて示す。
・1,4-BG:1,4-ブタンジオール(ブチレングリコール)
・DBTDL:ジブチルスズジラウレート
実施例1~7および比較例1~7
(1)プレポリマー調製工程
・プレポリマー調製工程
表2~表5に記載のポリイソシアネート成分およびポリオール成分を、窒素雰囲気下、イソシアネート基濃度(プレポリマー調製工程後のイソシアネート基濃度)が表2~表5に記載の値に至るまで、80℃で反応させた。
プレポリマー組成物100質量部に対して、ジブチルスズジラウレート(ウレタン化触媒、DBTDLを、表2~表5に記載の割合で添加した。そして、表2~表5に記載の当量比で、プレポリマー組成物と鎖伸長剤とを配合し、60秒混合し、室温にて60秒減圧脱泡した。その後、混合物を金型に流し込み、表2~表5に記載の硬化条件で硬化させ、その後、23℃で3週間養生した。これにより、ポリウレタン樹脂を得た。より具体的には、上記の注型成形により、注型ポリウレタンエラストマーを得た。
(1)ポットライフ
プレポリマー組成物および鎖伸長剤の混合後のポットライフを、JIS K 7301(1995)に準拠して、測定した。なお、プレポリマー組成物および鎖伸長剤の予熱温度を80℃に設定した。また、恒温槽の温度を80℃に設定した。その結果を表中に示す。
ポリウレタン樹脂のショアA硬度を、JIS K 7312(1996年)に準拠して測定した。
ポリウレタン樹脂の引張特性を、万能引張試験機(インテスコ社製 205N)により、JIS K 7312(1996年)に準拠して測定した。すなわち、ポリウレタン樹脂を切断し、3号ダンベル試験片を得た。そして、引張速度500mm/分の条件で、100%モジュラスおよび300%モジュラス(MPa)と、引張強度(MPa)と、伸び(破断伸び、%)とを測定した。
ポリウレタン樹脂を、幅25mm×長さ10cm×厚み2mmのサイズに切り出して試験片を得た。試験片の耐亀裂進展性を、デマチャ式屈曲試験機(FT-1500シリーズ、上島製作所製)を用いて、以下の方法で評価した。
Claims (5)
- イソシアネート基末端プレポリマーを含有するプレポリマー組成物であって、
前記イソシアネート基末端プレポリマーは、1,4-ビス(イソシアナトメチル)シクロヘキサンを含むポリイソシアネート成分と、ポリカーボネートポリオールを含むポリオール成分との反応生成物であり、
前記1,4-ビス(イソシアナトメチル)シクロヘキサンは、60モル%以上の割合でトランス体を含有し、
前記ポリカーボネートポリオールの80℃における粘度(V1)が、4000mPa・s以下であり、
前記プレポリマー組成物の80℃における粘度(V2)が、4000mPa・s以下であり、
前記プレポリマー組成物のイソシアネート基濃度が、8.0質量%以上13.0質量%未満である、プレポリマー組成物。 - 前記プレポリマー組成物が、前記イソシアネート基末端プレポリマーと、1,4-ビス(イソシアナトメチル)シクロヘキサンを含むイソシアネートモノマーとを含む、請求項1に記載のプレポリマー組成物。
- 請求項1に記載のプレポリマー組成物と、鎖伸長剤との反応生成物を含む、ポリウレタン樹脂。
- 請求項3に記載のポリウレタン樹脂を含む、弾性成形品。
- 前記1,4-ビス(イソシアナトメチル)シクロヘキサンを含むポリイソシアネート成分と、ポリカーボネートポリオールを含むポリオール成分とを準備する準備工程と、
前記ポリイソシアネート成分と前記ポリオール成分とを、前記ポリオール成分中の水酸基に対するポリイソシアネート成分中のイソシアネート基の当量比(NCO/OH)が1.0を超過する割合で反応させ、イソシアネート基末端プレポリマーを含む反応生成液を調製するプレポリマー調製工程とを備え、
前記1,4-ビス(イソシアナトメチル)シクロヘキサンは、60モル%以上の割合でトランス体を含有し、
前記ポリカーボネートポリオールの80℃における粘度(V1)が、4000mPa・s以下であり、
前記プレポリマー組成物の80℃における粘度(V2)が、4000mPa・s以下であり、
前記ポリカーボネートポリオールの80℃における前記粘度(V1)に対する、前記プレポリマー組成物の80℃における前記粘度(V2)の増加比率(V2/V1)が、2.0以下であり、
前記プレポリマー組成物のイソシアネート基濃度が、8.0質量%以上13.0質量%未満である、プレポリマー組成物の製造方法。
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- 2023-01-17 JP JP2023575243A patent/JPWO2023140229A1/ja active Pending
- 2023-01-17 CN CN202380014400.5A patent/CN118234769A/zh active Pending
- 2023-01-17 US US18/711,650 patent/US20250011523A1/en active Pending
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| US20250011523A1 (en) | 2025-01-09 |
| CN118234769A (zh) | 2024-06-21 |
| JPWO2023140229A1 (ja) | 2023-07-27 |
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