JP2013224504A - Conjugate monofilament and fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monofilament having high strength and excellent anti-staining properties against both aqueous stains and oily stains, and a fabric.SOLUTION: A conjugate monofilament includes: a thermoplastic resin other than a fluorine resin as a main component; and a fluorine resin joined linearly onto a periphery of the main component along a longitudinal direction as an outer peripheral component. At a cross-sectional outer edge of the conjugate monofilament, the peripheral component is exposed to the surface side from the main component at an interval in the circumferential direction.

Description

  The present invention relates to a composite monofilament in which a thermoplastic resin other than a fluororesin is used as a main component, and the main component and the fluororesin are bonded. More specifically, the present invention has sufficient tensile strength for fabrics, and The present invention relates to a composite monofilament that can exhibit the antifouling property due to the excellent non-adhesive property of a fluororesin, and has improved interfacial peeling between a thermoplastic resin other than the fluororesin and the fluororesin.

  Conventionally, monofilaments made of thermoplastic resins such as polyamide resin and polyester resin have well-balanced mechanical properties and are excellent in chemical and thermal properties. It is widely used for industrial materials such as automobile parts and precision machine parts.

  In addition, monofilaments used for fabrics such as filters are required to have heat resistance, chemical resistance, etc., and are made of conventional polyamide resins, polyester resins, etc., in response to these required properties that have become increasingly sophisticated in recent years. Since monofilaments do not provide sufficiently satisfactory characteristics, there is a great demand for the practical use of monofilaments made of fluororesins with excellent heat resistance, chemical resistance, friction / wear characteristics, weather resistance, water repellency and non-adhesiveness. It has become like this.

  Fluororesin monofilaments for fabrics that have antifouling performance utilizing the excellent non-adhesiveness and water repellency of the above fluororesins have already been developed. For example, ethylene / tetrafluoroethylene copolymers produced under specific conditions A monofilament made of (for example, see Patent Document 1) has been proposed.

  However, monofilaments made of ethylene / tetrafluoroethylene copolymer have lower strength than monofilaments made of conventional polyamide resin and polyester resin, so they are used in harsh usage environments such as textiles for papermaking tools and textiles for belt conveyors. However, this is not suitable as a monofilament for fabrics used in US Pat.

  Furthermore, as a monofilament having high strength and water repellency, for example, a core-sheath type composite monofilament composed of a core part made of polyamide resin and a sheath part made of a modified ethylene / tetrafluoroethylene copolymer having a reactive group (See, for example, Patent Document 2).

  The core-sheath type composite monofilament has a high water repellency because the surface of the monofilament is covered with a fluororesin and has excellent antifouling properties against aqueous stains. It has a familiar nature. In addition, since it is easily charged with static electricity, it has the property of sucking dust or dirt floating in the atmosphere. Therefore, the fabric using the above-described core-sheath type composite monofilament has a problem that dirt and dust remain on traces of water droplets and organic components flowing, and the dirt is easily fixed after drying.

JP 2010-7194 A JP 2005-76158 A

  The present invention has been achieved as a result of studying the above-described problems in the prior art as an object.

  Accordingly, an object of the present invention is to provide a monofilament and a fabric having high strength and excellent antifouling properties against both aqueous and oily soils.

  In order to achieve the above object, according to the present invention, a composite having a thermoplastic resin other than a fluororesin as a main component and a fluororesin linearly joined to the outer periphery of the main component along the longitudinal direction as a peripheral component. There is provided a composite monofilament, wherein the outer peripheral component is exposed from the main body component to the surface side at an interval in the circumferential direction at the outer edge of the cross section of the composite monofilament.

In the composite monofilament of the present invention,
5 to 40% of the outer peripheral component is exposed to the entire surface of the composite monofilament,
In the cross section of the composite monofilament, the ratio of the cross-sectional area of the outer peripheral component and the main body component is in the range of 10:90 to 40:60.
The fluororesin has an adhesive functional group;
The fluororesin is a modified ethylene / tetrafluoroethylene copolymer or a modified ethylene / tetrafluoroethylene / hexafluoropropylene copolymer having an adhesive functional group, and a tensile strength of 400 MPa or more;
However, all are mentioned as preferable conditions, and when these conditions are satisfied, a further excellent effect can be obtained.

  Furthermore, the fabric of the present invention is characterized by comprising these composite monofilaments.

  According to the present invention, as described below, it is possible to obtain a monofilament suitable for a fabric having high strength and excellent antifouling properties against both aqueous and oily soils.

FIG. 1 is a schematic view showing an example of a vertical cross-sectional shape with respect to the longitudinal direction of the composite monofilament of the present invention. FIG. 2 is a perspective view showing an example of the composite monofilament of the present invention. FIG. 3 is a photograph showing a first example of a cross-sectional shape perpendicular to the longitudinal direction of the composite monofilament of the present invention.

  Hereinafter, the composite monofilament of the present invention will be specifically described with reference to the drawings.

  As shown in FIGS. 1 and 2, the composite monofilament 1 of the present invention has a main body component 2 made of a thermoplastic resin other than a fluororesin, and fluorine bonded linearly to the outer periphery of the main body component 2 along the longitudinal direction. A composite monofilament 1 having a resin as an outer peripheral component 3.

  At the outer edge of the cross section of the composite monofilament 1, the fluororesin that is the outer peripheral component 3 is exposed from the main body component 2 to the surface side at intervals in the circumferential direction.

  The composite monofilament 1 of the present invention can obtain a monofilament particularly excellent in antifouling property when the outer peripheral component 3 is exposed 5 to 40% with respect to the entire surface of the composite monofilament.

  If the exposure ratio of the outer peripheral component 3 to the entire surface of the composite monofilament 1 is too low, the anti-fouling effect due to the non-adhesiveness and water repellency of the fluororesin tends to decrease, and conversely the exposure ratio of the outer peripheral component 3 is high. When it is too much, the obtained composite monofilament 1 tends to be charged with static electricity, and tends to attract dust, dust, etc. floating in the atmosphere.

  Therefore, in order to obtain the composite monofilament 1 of the present invention having excellent antifouling properties against both aqueous and oily soils, it is a preferable condition that the exposure ratio of the outer peripheral component 3 is 5 to 40%. More preferably, it is 10 to 30%.

  The exposure ratio of the outer peripheral component 3 can be calculated, for example, from the vertical section with respect to the longitudinal direction of the composite monofilament 1 of the present invention shown in FIG.

X = (L / C) × 100% (1)
X: Exposure ratio of peripheral component 3 (unit:%)
L: Total length on the outer edge of the outer peripheral component 3 part at the outer edge of the cross section (L = L1 + L2 + L3 + L4 + L5 + L6) (unit: mm)
C: Overall circumferential length of the composite monofilament 1 (unit: mm)
In the cross section of the composite monofilament 1 of the present invention, the ratio of the cross-sectional area of the outer peripheral component 3 and the main body component 2 is in the range of 10:90 to 40:60. It can be said that this is a preferable condition because it is difficult to cause peeling and at the same time a high-strength composite monofilament 1 can be obtained.

  That is, when the ratio of the outer peripheral component 3 is less than 10% of the cross-sectional area in the ratio of the cross-sectional area of the outer peripheral component 3 to the main body component 2 of the composite monofilament 1, adhesion between the fluororesin and a thermoplastic resin other than the fluororesin is achieved. This is not preferable because the area is reduced and interfacial peeling tends to occur. Moreover, when the ratio of the outer periphery component 3 exceeds 40% of the said cross-sectional area, the unfavorable tendency that the obtained composite monofilament 1 will become a low intensity | strength will be caused.

  In the composite monofilament 1 of the present invention, the fluororesin constituting the outer peripheral component 3 includes chlorotrifluoroethylene copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / perfluoro (alkyl ether) copolymer Polymers, ethylene / tetrafluoroethylene copolymers, ethylene / tetrafluoroethylene / tetrafluoropropylene copolymers, polyvinylidene fluoride copolymers, etc., among which the fluororesin has an adhesive functional group Since the adhesiveness with a thermoplastic resin is improved and a high-strength composite monofilament 1 can be obtained, it is preferable.

  Examples of the adhesive functional group include a carbonyl group, a hydroxyl group, an amino group, and the like, and the introduction is easy, and the resulting resin has moderate heat resistance and good adhesion at a relatively low temperature. An amino group, a carbamoyl group, a hydroxyl group, a carboxyl group, a carbonate group, and a carboxylic acid halide group are preferable.

  In the present invention, the fluororesin includes a modified ethylene / tetrafluoroethylene copolymer and / or a modified ethylene / tetrafluoroethylene / hexafluoropropylene copolymer having an adhesive functional group having a melting point in the range of 150 ° C. to 230 ° C. A polymer can be preferably used.

  Examples of such a fluororesin having an adhesive functional group include RP-4000 and RP-5000 of modified EFEP (ethylene / tetrafluoroethylene / hexafluoropropylene copolymer) manufactured by Daikin Industries, modified ETFE manufactured by Asahi Glass ( LM-ETFE AH-2000 of ethylene / tetrafluoroethylene copolymer) and the like, and these can be preferably used in the present invention.

  On the other hand, in the composite monofilament 1 of the present invention, the thermoplastic resin other than the fluororesin constituting the main component 2 is not particularly limited. For example, polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polyvinylidene chloride, 6 nylon, Polyamide resin such as 66 nylon, 610 nylon, 612 nylon, 46 nylon, 56 nylon, 410 nylon, 510 nylon, 1010 nylon, 6/66 copolymer or the like, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate Polyester resins such as polybutylene naphthalate or copolymers thereof, polyphenylene sulfide, polyetheretherketone, polyamideimide, polyimide, and liquid crystal polyester It is possible to have.

  These may be used alone or as a mixture. Among these, a polyamide resin or a copolymer thereof is suitable for the purpose of the present invention because it has high tensile strength and moderate elongation and is excellent in heat resistance, and can be preferably used.

  The composite monofilament 1 of the present invention is a composite monofilament 1 having a thermoplastic resin other than a fluororesin as a main component 2 and a fluororesin linearly bonded along the longitudinal direction as an outer peripheral component 3 on the outer periphery of the main component. The outer periphery 3 of the composite monofilament 1 is exposed from the main body component 2 to the surface side at intervals in the circumferential direction.

  In general, a fluorine resin has a contact angle with water of 90 degrees or more, while a polyamide resin, which is one of thermoplastic resins other than the fluorine resin, has a contact angle with water of about 50 degrees. In this way, two or more kinds of resins having greatly different contact angles with water are linearly joined along the longitudinal direction on the outer periphery of the monofilament and exposed to the surface, thereby preventing both oily and aqueous stains. Dirtyness is greatly improved.

  That is, when a water droplet containing oily soil such as an organic component contacts the surface of the composite monofilament 1 of the present invention, the water droplet containing oily soil is repelled by the water repellent effect of the fluororesin as the outer peripheral component 3. And move to the thermoplastic resin side other than the fluororesin that is the adjacent main body component 2. The collected water droplets containing oily dirt form a water path, so that the oily dirt such as organic components can easily flow off without staying on the surface of the composite monofilament 1 and is also soiled after drying. The effect of reducing the adhesion rate is exhibited.

  Next, the manufacturing method of the composite monofilament 1 of the present invention will be described in detail.

  The production of the composite monofilament 1 of the present invention does not require the use of any special production apparatus, and for example, a single-screw or twin-screw extruder sheath / core composite melt spinning machine can be used, and the resin temperature is 200 to Conditions such as 350 ° C., extrusion pressure of 1 to 50 MPa, extrusion nozzle hole diameter of 0.1 to 20 mm, and spinning speed of 0.3 to 100 m / min can be appropriately selected.

  Next, the melt spun from each extruder and combined in the die passes through a short gas zone and is subsequently led into a cooling medium to be cooled and solidified. Examples of the cooling medium include water and polyethylene glycol. However, the cooling medium is not particularly limited as long as it can be easily removed from the surface of the monofilament and does not cause a chemical or physical change.

  The unstretched yarn that has been cooled and solidified is subjected to one-stage heating or multi-stage drawing in order to obtain the necessary strength as a monofilament. Examples of the heat medium used in this case include air, hot water, steam, polyethylene glycol, glycerin and silicone oil, but they can be easily removed from the surface of the monofilament, and the chemical and physical changes can be made. If it does not give, it will not specifically limit.

  Moreover, although it changes with resin to be used about extending | stretching conditions, extending | stretching by 4 to 7 times of total extending | stretching ratio is preferable when obtaining sufficient intensity | strength as a monofilament. The total draw ratio here is the product of the draw ratio at the first stage and the draw ratio at the time of redrawing.

  In both single-stage and multi-stage processes, relaxation heat treatment is performed in a dry heat bath following stretching, and the temperature and relaxation heat treatment magnification can be appropriately selected depending on the resin used.

  This relaxation heat treatment corrects the unstable structure (lateral distortion, elongation reduction, crack) inside the monofilament generated in the stretching process. After this relaxation heat treatment, the finish oil is attached and wound.

  When the composite monofilament 1 of the present invention obtained as described above is used as a constituent material of a fabric, it exhibits characteristics that have excellent antifouling properties not found in conventional fabrics.

  In particular, for the composite monofilament 1 used for industrial fabrics such as various filters and conveyor belts, those having a tensile strength of 400 MPa measured according to JIS L1013-1999 are preferably used.

  Moreover, although the diameter of the said composite monofilament 1 can be suitably selected according to a use, the range of 0.05-1.5 mm is most often used normally as a monofilament for fabrics.

  In addition, the composite monofilament 1 of the present invention includes a small amount of particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin, zirconium acid, and other inorganic particles, crosslinked polymers, and various metal particles. In addition to the above, conventionally known antioxidants, sequestering agents, ion exchangers, anti-coloring agents, weathering agents, flame retardants, various coloring agents, antistatic agents, waxes, various surfactants, various reinforcing fibers , And various plasticizers may be added.

  In the present specification and drawings, the case where the number of outer peripheral components 3 (fluororesin components) exposed from the main body component 2 to the surface side at the outer edge of the cross section of the composite monofilament 1 is six is illustrated. The number of component 3 is not particularly limited. Preferable conditions are 3 to 12, and in this case, the anti-fouling effect due to the non-adhesiveness and water repellency of the fluororesin becomes more remarkable.

  As described above, the composite monofilament 1 of the present invention has high strength and excellent antifouling properties. Therefore, when used for industrial fabrics such as various filters and conveyor belts, the composite monofilament 1 is durable. The effect of being excellent can be obtained.

  Hereinafter, although the composite monofilament and fabric of this invention are demonstrated based on an Example, the composite monofilament of this invention is not limited to a following example at all unless the summary is exceeded.

  Moreover, the composite monofilament and the fabric in the examples were evaluated by the following methods.

[Exposure ratio of fluororesin layer (peripheral component)]
The composite monofilament is cut perpendicularly to the longitudinal direction, the cross section is observed with a digital microscope VHX-100F made by KEYENCE, and the total perimeter of the composite monofilament and the surface exposure length on the outer edge of the fluororesin layer are measured, The surface exposure ratio of the fluororesin layer was determined as a percentage (unit:%).

[Outer circumference component / Body component cross-sectional area ratio]
Cut the composite monofilament perpendicularly to the longitudinal direction, observe the cross section with KEYENCE digital microscope VHX-100F, and use the digital microscope area measurement tool to cross section the fluororesin layer (peripheral component) And the cross-sectional area of the main component was measured, and the peripheral component / main component cross-sectional area ratio was determined from the area ratio.

[Tensile strength of monofilament]
According to JIS L1013-1999, after leaving the measurement sample in a temperature and humidity adjustment room at 20 ° C. and 65% RH for 24 hours, using a tensile tester (“Tensilon” (registered trademark) RTM500 type manufactured by Orientec Co., Ltd.) Test length: Measured under conditions of 250 cm and a tensile speed of 300 mm / min. The value was divided by the fineness of the measurement sample, and the obtained value was taken as the tensile strength (unit: MPa).

[Anti-fouling property of monofilament]
(Cloth adhesive gum tape peeling stress measurement test method by cloth adhesive gum tape attaching and peeling method (hereinafter referred to as cloth adhesive gum tape peeling test))
(1) Two biaxially stretched films made of an ethylene / tetrafluoroethylene / hexafluoropropylene copolymer having a reactive group with a thickness of 150 to 250 μm, a width of 30 mm, and a length of 120 mm are prepared, and each film has a width of 30 mm. By attaching the cloth adhesive tape of 25 mm × 25 mm size coated with an adhesive on one side so as to cross over both ends of the two films, A film having an apparent longitudinal length of 240 mm and a lateral width of 30 mm joined in the longitudinal direction at the joint is produced.

  (2) Double-sided adhesive tape with a width of 10 mm and a length of 120 mm (Nitto Denko Corporation) on one half (one film) of the surface of the film in which the two sheets are joined together without the cloth adhesive tape attached ) Product, No. 523 or equivalent product) is pasted with the film and the double-sided adhesive tape center (center) in the width direction aligned in the longitudinal direction.

  (3) A monofilament sample cut to a length of about 200 mm is stuck on the adhesive tape of the film to which the double-sided adhesive tape is attached, without any gaps in parallel with the longitudinal direction of the film, and protrudes from the longitudinal direction of the double-sided adhesive tape. The remaining end of the monofilament is cut off with a scissors to obtain a monofilament sample affixing film.

  (4) The monofilament sample affixing film is placed on a flat glass plate (thickness: about 8 mm, length: about 80 mm, width: about 250 mm), the surface on which the monofilament is affixed faces upward, and the film on the side where the monofilament is affixed is on the left Cloth adhesive tape (manufactured by Nichiban Co., Ltd., strong adhesive tape for cardboard packaging [LS] No. 101N or equivalent) coated with adhesive on one side cut to a width of 10 mm and a length of 150 mm The fabric adhesive tape is temporarily affixed on the monofilament by aligning the left end in the longitudinal direction of the fabric adhesive tape with the left end of the film on the monofilament sample affixing film. Next, the cloth adhesive tape 30 mm remaining on the film on the side where the monofilament is not pasted beyond the right end of the film on the side where the monofilament is pasted is firmly pasted on the film surface on the side where the monofilament is not pasted.

  (5) The monofilament adhesive film is turned over, and the cloth adhesive tape attached to join the two films in (1) is removed.

  (6) Set the monofilament affixed film with the monofilament affixed face up, and set the monofilament affixed part on the glass plate so that it is temporarily affixed to the monofilament surface. A rubber roller having a mass of 1.43 kg, a width of 50 mm, and a diameter of 86 mm is caused to run one way from the right longitudinal direction of the film on which the cloth adhesive tape is stacked, and the cloth adhesive tape is attached to the monofilament sample to prepare a sample for measuring peel stress. Make it.

  (7) Fold the mountain so that the surface of the cloth adhesive tape is on the inside with the joint of the two films of the sample for measuring the peel stress as a fulcrum, and then paste it onto the monofilament from the fold fulcrum The cloth adhesive tape is peeled off about 10 mm in length, and the exposed end of the monofilament film is set at the center of the upper chuck of a tensile tester (Orientec Tensilon / UTM-III-100). The lower end (mountain hem portion) of the film on which one monofilament is not attached is set at the center of the lower chuck of the tensile tester, and the tensile speed is 100 mm / min and the chart speed is 100 mm / min. The peel stress is measured by the above, and a peel stress chart in which peaks having high peel stress and valleys having low peel stress are alternately connected is obtained.

  (8) From the peak of the first peel stress in the obtained peel stress chart, the peak of the peel stress about 20 mm after about 20 mm is used as a starting point, and the average of the peel stresses at each of the 40 alternating peaks and valleys is read. The value is taken as the peel stress, this measurement is performed at n = 10, and the average value is taken as the cloth adhesive gum tape peel stress.

  In addition, by adopting the above-mentioned cloth adhesive gum tape peeling test, it is possible to quantitatively evaluate the antifouling property of the cloth comprising the composite monofilament of the present invention as a constituent material without using the cloth, and the cloth adhesive gum tape. The lower the peeling stress, the better the antifouling property against oily soils such as organic components. Moreover, the cloth adhesive gum tape peeling stress used as a normal comparative sample (referred to as Comparative Example 1) is assumed to be a gum pitch antifouling index (hereinafter sometimes referred to as “antifouling index”) 100, and an effect is obtained when the antifouling index is 100 or more. As a result, 90 or less was set as a target. In addition, the antifouling index was calculated by the following formula (2).

  Antifouling index = cloth adhesive gum tape peeling stress / cloth adhesive gum tape peeling stress of comparative sample × 100 (2).

[Interfacial peelability]
At the tip of a 5.5mmφ stainless steel round bar (circular flat cross section), the crushing part is crushed by applying a force so that the width of the crushing part is about 2.5 times the thickness of the thread. By observing the degree of peeling at the interface with the naked eye, the following criteria were used.

○: No peeling is observed by observation with an optical microscope (40 times). X: Separation is entirely observed by observation with an optical microscope (40 times).

[Example 1]
80% by mass of 6 nylon (manufactured by Toray M1021T) as the main component and 20% by mass of an ethylene / tetrafluoroethylene / hexafluoropropylene copolymer (modified EFEP RP-5000 manufactured by Daikin Industries) having an adhesive functional group as the outer peripheral component The mixture was supplied to an extruder type composite spinning machine, melted and kneaded at a melting temperature of 240 to 290 ° C, spun through a composite die, and further cooled and solidified in a cooling bath at 50 ° C.

  The cooled and solidified unstretched yarn is stretched to the first stage three times in a warm water bath at 93 ° C., then stretched to the second stage by 1.5 times in a 140 ° C. hot air drying furnace, and further to 150 ° C. A composite monofilament having a diameter of 0.290 mm was prepared by performing a relaxation heat treatment 0.95 times in a dry heat bath.

[Example 2]
A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except that the outer peripheral component was changed to 20% by mass of an ethylene / tetrafluoroethylene copolymer ("Fluon" (registered trademark) ETFE C88AXP manufactured by Asahi Glass). .

[Example 3]
55% by mass of 6 nylon (manufactured by Toray M1021T) as the main component and 45% by mass of ethylene / tetrafluoroethylene / hexafluoropropylene copolymer (modified EFEP RP-5000 manufactured by Daikin Industries) having an adhesive functional group as the outer peripheral component A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except that the above was changed.

[Example 4]
60% by mass of 6 nylon (manufactured by Toray M1021T) as a main component and 40% by mass of an ethylene / tetrafluoroethylene / hexafluoropropylene copolymer (modified EFEP RP-5000 manufactured by Daikin Industries) having an adhesive functional group as an outer peripheral component A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except that the above was changed.

[Example 5]
70% by mass of 6 nylon (manufactured by Toray M1021T) as a main component, and 30% by mass of an ethylene / tetrafluoroethylene / hexafluoropropylene copolymer (modified EFEP RP-5000 manufactured by Daikin Industries) having an adhesive functional group as an outer peripheral component A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except that the above was changed.

[Example 6]
85% by mass of 6 nylon (manufactured by Toray M1021T) as a main component and 15% by mass of an ethylene / tetrafluoroethylene / hexafluoropropylene copolymer (modified EFEP RP-5000 manufactured by Daikin Industries) having an adhesive functional group as an outer peripheral component A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except that the above was changed.

[Example 7]
92% by mass of 6 nylon (manufactured by Toray M1021T) as the main component, and 8% by mass of ethylene / tetrafluoroethylene / hexafluoropropylene copolymer (modified EFEP RP-5000 manufactured by Daikin Industries) having an adhesive functional group as the outer peripheral component A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except that the above was changed.

[Example 8]
A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except that the main body component was changed to 80% by mass of 610 nylon (M2001 manufactured by Toray).

[Example 9]
85% by mass of 610 nylon (manufactured by Toray M2001) as the main component, and 15% by mass of modified ethylene / tetrafluoroethylene copolymer (modified ETFE LM-ETFE AH-2000 manufactured by Asahi Glass) having an adhesive functional group as the outer peripheral component A composite monofilament having a diameter of 0.290 mm was prepared under the same conditions as in Example 1 except for the change.

[Comparative Example 1]
6 nylon (manufactured by Toray M1021T) was supplied to an extruder type melt spinning machine, melted and kneaded at a melting temperature of 230 to 260 ° C, then spun through a die and cooled and solidified in a cooling bath at 10 ° C.

  The cooled and solidified unstretched yarn is stretched by 3.5 times in a 100 ° C. steam bath, then stretched by 1.71 times in a 200 ° C. hot air drying furnace, and further stretched by 180 ° C. The nylon 6 monofilament having a diameter of 0.288 mm was prepared by performing a relaxation heat treatment of 0.9 times in a dry heat bath.

[Comparative Example 2]
An ethylene / tetrafluoroethylene copolymer (Fullon-ETFE-C88AXP manufactured by Asahi Glass Co., Ltd.) is supplied to an extruder type melt spinning machine, melted and kneaded at a melting temperature of 285 to 310 ° C, then spun through a die and cooled at a cooling bath of 50 ° C. The chilled and solidified unstretched yarn was stretched 3.9 times in a hot water bath at 85 ° C, and then stretched to 1.24 times in a hot air drying oven at 150 ° C. The ETFE monofilament having a diameter of 0.275 mm was prepared by stretching and further performing a relaxation heat treatment of 0.93 times in a 160 ° C. dry heat bath.

[Comparative Example 3]
70% by mass of 6 nylon (manufactured by Toray M1021T) as a main component and 30% by mass of an ethylene / tetrafluoroethylene / hexafluoropropylene copolymer (modified EFEP RP-5000 manufactured by Daikin Industries) having an adhesive functional group as an outer peripheral component The mixture was supplied to an extruder type composite spinning machine, melted and kneaded at a melting temperature of 240 to 290 ° C, spun through a composite die, and further cooled and solidified in a cooling bath at 50 ° C.

  The cooled and solidified unstretched yarn is stretched by one stage three times in a 93 ° C hot water bath, then stretched to the second stage by a factor of 1.5 in a hot air drying oven at 140 ° C, and further dried at 150 ° C. A core-sheath composite monofilament having a diameter of 0.292 mm in which the outer peripheral component covered the entire outer periphery of the main component was prepared by performing a relaxation heat treatment of 0.95 times in a heat bath.

  As is apparent from the results in Table 1, the composite monofilaments of the present invention (Examples 1 to 9) have high anti-fouling properties while having high tensile strength, and thermoplastic resins other than the fluororesin as the main component. Peeling was not observed at the interface with the outer peripheral component fluororesin, and it was highly practical.

  On the other hand, monofilaments that do not satisfy the present invention (Comparative Examples 1 to 3) are inferior in antifouling properties (Comparative Example 1) even with high tensile strength, or excellent in antifouling properties but low in tensile strength (Comparison Example 2) No monofilaments that satisfy the three requirements of high strength, antifouling property and interfacial peelability at the same time, such as those having higher strength and excellent antifouling properties, but having interface peeling (Comparative Example 3) The practicality was low.

[Example 10, Comparative Example 4]
The composite monofilaments obtained in Example 1 and Comparative Example 3 were used for practical evaluation of industrial fabrics. That is, a double-woven fabric was produced using each composite monofilament for warp and weft. When this fabric was inspected, the fabric using the composite monofilament of the present invention (Example 10) had no yarn breakage or yarn cracking during weaving, and had no unevenness in the woven form. From this result, it was judged that the composite monofilament of the present invention was useful for application to fabrics.

On the other hand, a double-woven fabric (Comparative Example 4) produced using a composite monofilament that does not satisfy the conditions of the present invention has 0.8 fluffs due to interfacial peeling per 10 m ² of the fabric. It was inferior.

Further, after the fabrics produced in Example 10 and Comparative Example 4 were used in a belt press filter process for 30 days, the state of soiling on the fabric surface was confirmed using an optical microscope, and the composite monofilament of the present invention was used. The fabric (Example 10) had an excellent characteristic that the number of foreign matters and stains per 10 mm ² was 50 or less, and foreign matters and stains were difficult to adhere over a long period of time. On the other hand, in the fabric made of the composite monofilament that does not satisfy the conditions of the present invention (Comparative Example 4), the number of foreign matters and stains per 10 mm ² is 50 or more, and only insufficient antifouling property can be achieved. It was not.

  According to the present invention, a composite monofilament having a high strength and excellent antifouling property against both aqueous and oily soils can be obtained. When this is used for a fabric, excellent durability is obtained. Has excellent anti-fouling properties such as long-term antifouling performance.

DESCRIPTION OF SYMBOLS 1 Composite monofilament 2 Main body component 3 Outer peripheral component L1 Length on outer edge of outer peripheral component L2 Length on outer edge of outer peripheral component L3 Length on outer edge of outer peripheral component L4 Length on outer edge of outer peripheral component L5 Outer edge of outer peripheral component Upper length L6 Length on outer edge of outer periphery component

Claims (7)

A composite monofilament having a thermoplastic resin other than a fluororesin as a main component and a fluororesin linearly bonded to the outer periphery of the main component along the longitudinal direction as an outer peripheral component. The composite monofilament is characterized in that the outer peripheral component is exposed to the surface side from the main body component at intervals in the circumferential direction. 2. The composite monofilament according to claim 1, wherein the outer peripheral component is exposed by 5 to 40% with respect to the entire surface of the composite monofilament. 2. The composite monofilament according to claim 1, wherein in the cross section of the composite monofilament, a ratio of a cross-sectional area between the outer peripheral component and the main body component is in a range of 10:90 to 40:60. The composite monofilament according to claim 1, wherein the fluororesin has an adhesive functional group. 5. The composite monofilament according to claim 1, wherein the fluororesin is a modified ethylene / tetrafluoroethylene copolymer or a modified ethylene / tetrafluoroethylene / hexafluoropropylene copolymer having an adhesive functional group. . The composite monofilament according to any one of claims 1 to 5, wherein the tensile strength is 400 MPa or more. A fabric comprising the composite monofilament according to any one of claims 1 to 6.