WO2006011490A1 - 複合繊維、中空繊維及び前記複合繊維を用いた中空繊維の製造方法 - Google Patents
複合繊維、中空繊維及び前記複合繊維を用いた中空繊維の製造方法 Download PDFInfo
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- WO2006011490A1 WO2006011490A1 PCT/JP2005/013666 JP2005013666W WO2006011490A1 WO 2006011490 A1 WO2006011490 A1 WO 2006011490A1 JP 2005013666 W JP2005013666 W JP 2005013666W WO 2006011490 A1 WO2006011490 A1 WO 2006011490A1
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- water
- fiber
- composite fiber
- hollow
- core
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/08—Addition of substances to the spinning solution or to the melt for forming hollow filaments
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/10—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
Definitions
- the present invention relates to a fiber having a hollow structure that could not be formed by a conventional fiber manufacturing technology that also has thermoplastic polymer strength, and more specifically, a composite fiber for manufacturing the fiber and a hollow fiber from the composite fiber. It relates to a method of manufacturing. More specifically, the present invention is a hollow having a good texture with lightness, opacity (prevention of see-through), heat retention, heat insulation, water absorption, and swell (sag resistance). The present invention relates to a fiber, a composite fiber for producing the fiber, and a method for producing a hollow fiber from the composite fiber.
- Synthetic fibers such as polyester and polyamide are widely used not only for clothing but also for industrial use due to their excellent physical and chemical properties, and have industrially important value.
- these synthetic fibers have a single distribution in the single yarn fineness, large single yarn fineness, and simple cross-sectional shape. Therefore, these synthetic fibers can be used for natural fibers such as silk, cotton, and hemp. The texture and gloss are monotonous compared.
- these synthetic fibers have a low quality because they are cold and have a slimy feel. Therefore, in order to improve the shortcomings of synthetic fibers, it has been widely practiced to make the cross-sectional shape of synthetic fibers irregular or to make the fibers hollow.
- a typical method for producing a modified cross-section fiber or hollow fiber includes a method using a modified spinning nozzle or a hollow spinning nozzle.
- deformed cross-section fibers and hollow fibers produced by this method have a deformed cross-section that collapses due to the surface tension of the resin that is in a molten state between spinning and solidification, the take-up tension during spinning, etc. Is easy to collapse.
- the porous or special hollow portion is then crushed and disappears. Or the ratio of the hollow portion is likely to decrease.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-129333 (Patent Document 1), in place of a method using a normal hollow nozzle having a round hollow portion, two hollow hollow spinning nozzles are used in a hollow interior.
- a method for producing hollow fibers having the above (preferably 3 to 6) protrusions is described, and according to this method, the hollow portion is hard to be crushed by the action of the protrusions, and it can be used as a tire cord or a V-belt. It is described that fibers are obtained.
- JP-A-7-316977 discloses that an alkali-degradable polymer is a core component (sea component) and a sheath component (island component) is polyamide or ethylene vinyl alcohol.
- a technology has been proposed in which a porous fiber is obtained by forming a composite fiber using an alkali-resistant polymer having a water absorption rate of 3% or more, such as a polymer, and then decomposing and removing the easily decomposable polymer by treating with a hot alkaline aqueous solution. Yes.
- wastewater treatment of alkali decomposition products is complicated, and there are environmental problems.
- the sheath component needs to have resistance to alkali and water absorption, and can be used for polymerization.
- the body is restricted. Therefore, in this method, it is difficult to use polyester (polylactic acid, polyethylene terephthalate, polybutylene terephthalate, etc.) that is weak against alkali as the sheath component. It is virtually impossible to produce hollow fibers.
- the cross-sectional shape of the core component may be a square, an ellipse, or a star. However, in these shapes, sufficient sheer prevention and sag resistance are provided. I can't get it.
- Patent Document 3 describes that the core component is easily extracted and removed.
- a path composed of the core component polymer is provided so as to reach the fiber surface from the core part, and at least 4 (preferably 4 to 8) are provided in the core part.
- a core-sheath type composite fiber for producing a hollow fiber provided with a protrusion has been proposed.
- the hollow fiber from which this composite fiber force can also be obtained has an opening (opening groove) from the hollow part to the fiber surface. Therefore, a part of the side surface of the hollow fiber is missing.
- the missing portion is greatly expanded due to the surface tension of the polymer during spinning, so that the hollow portion is easily crushed. Furthermore, it is not sufficient for the see-through preventing effect and the heat retaining property.
- Patent Document 4 discloses that a water-soluble thermoplastic polyvinyl alcohol polymer is used as a core component (island component), and this core component is dissolved and removed.
- a method for producing a hollow fiber having one or more (preferably 10 or more) hollow portions has been proposed.
- This document describes that the shape of the core component may be an irregular cross section in addition to a round cross section or an elliptic cross section.
- this hollow fiber has low heat retention and heat shielding properties.
- even if the cross section is irregular it is not possible to obtain sufficient sag resistance if it is a normal irregular cross section or elliptical cross section.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-129333 (Claim 1, paragraph number [0012] [0027])
- Patent Document 2 Japanese Patent Application Laid-Open No. 7-316977 (Claims, paragraph number [0011] [0038] ⁇ [0040])
- Patent Document 3 Japanese Patent Laid-Open No. 5-331701 (Claims, paragraph number [0021])
- Patent Document 4 Japanese Patent Laid-Open No. 2003-73970 (Claims, paragraph number [0013]) Disclosure of Invention
- an object of the present invention is to provide a hollow fiber having a high texture and a feeling of bulging (sag resistance), a method for producing the hollow fiber, and the hollow fiber. It is providing the composite fiber used in order to manufacture.
- Another object of the present invention is to provide a hollow fiber excellent in light weight, heat retaining property and heat shielding property, a method for producing the hollow fiber, and a composite fiber used for producing the hollow fiber.
- Still another object of the present invention is to provide a hollow fiber excellent in water absorbency despite being composed of a hydrophobic polymer, a method for producing the hollow fiber, and a composite used for producing the hollow fiber. To provide fiber.
- Another object of the present invention is to easily produce a hollow fiber excellent in lightness, anti-slipping property, heat retaining property, heat insulation property, swell feeling (sag resistance), etc. by an environmentally safe method. There is to do.
- the cross-sectional shape of the core portion made of the water-soluble thermoplastic polymer is an irregular cross-sectional shape having 10 or more protrusions. It has been found that when hollow fibers are produced using a certain core-sheath type composite fiber, hollow fibers having an excellent texture with high anti-translucency (opacity) and a feeling of swelling (sag resistance) can be obtained. .
- the composite fiber of the present invention is a core-sheath type composite fiber having a sheath part made of a water-insoluble thermoplastic polymer and a core part made of a water-soluble thermoplastic polymer,
- the cross-sectional shape of the core portion in the direction perpendicular to the direction is a deformed cross-sectional shape having 10 or more protrusions.
- the ratio between the outer peripheral length (L2) of the core and the outer peripheral length (L1) of the composite fiber may satisfy the following formula (1).
- the composite fiber has a cross-sectional shape of the core part in a direction perpendicular to the length direction.
- a deformed cross-sectional shape having tongue-shaped or leaf-shaped protrusions of about 15 to 200 (for example, 20 to: LOO) extending in different outward directions (for example, radial directions) Pete specific force Long side Z Short side 1Z1 ⁇ : It may be about LOOZ1 (for example, 3Zl ⁇ 50Zl).
- the water-soluble thermoplastic polymer is a water-soluble thermoplastic polyvinyl alcohol polymer such as an ⁇ -olefin unit having 4 or less carbon atoms and a C alkyl butyl ether.
- the water-insoluble thermoplastic polymer mainly comprises a polyolefin-based resin having an equilibrium moisture content of 2% or less at 23 ° C. and 50% RH, and a Z- or polyester-based resin, for example, a polypropylene-based resin, a C alkylene acrylate unit. Polyester rosin and fat as ingredients
- a group polyester-based resin may be used.
- the water-insoluble thermoplastic polymer may be a biodegradable polymer.
- the composite fiber is treated with a hydrophilic solvent to reduce the core portion of the composite fiber.
- a method for producing a hollow fiber in which a part is removed is included.
- the hollow fiber is made of a water-insoluble thermoplastic polymer, and the cross-sectional shape in a direction perpendicular to the length direction is 10 or more protrusions extending inward from the inner wall.
- a hollow fiber having a modified cross-sectional shape having a portion is also included.
- This hollow fiber is a hollow fiber having a hollow ratio of 5 to 90% (especially 45 to 90%) obtained by the above method, and the cross-sectional shape of the hollow inner wall corresponds to the cross-sectional shape of the core portion of the composite fiber. Also good.
- the hollow fiber may have a water-soluble thermoplastic polymer on at least a part of the hollow inner wall surface.
- the hollow fiber of the present invention can be produced without forming an opening groove that communicates from the hollow portion to the fiber side surface.
- the “fiber” is not limited to a fiber composed of the composite fiber or the hollow fiber of the present invention alone, but is a multifilament yarn, spun yarn, woven / knitted fabric, non-woven fabric, paper, artificial leather.
- blended yarns with other fibers naturally fibers, semi-synthetic fibers, other synthetic fibers
- blended yarns processed yarns (spun yarns, entangled yarns, crimped yarns, etc.), woven fabrics,
- knitted fabrics, fiber laminates, and various end products composed of these fibers.
- the hollow fiber of the present invention has a special-shaped hollow portion made of a hydrophobic polymer that hardly exhibits water absorption, and therefore has high anti-slipping property (opacity) and a feeling of swell (health resistance). It has an excellent texture with Moreover, it is excellent also in lightness, heat retention, and heat insulation. In addition, it is excellent in water absorption despite being composed of a hydrophobic polymer. Furthermore, according to the present invention, such excellent hollow fibers can be easily produced without causing problems in wastewater treatment and environmental aspects.
- FIG. 1 is a schematic cross-sectional view showing an example of a cross-sectional shape of a conjugate fiber of the present invention.
- FIG. 2 is a schematic cross-sectional view showing another example of the cross-sectional shape of the conjugate fiber of the present invention.
- FIG. 3 is an electron micrograph (2500 times) of an example of the hollow fiber of the present invention.
- FIG. 4 is an electron microscopic cross-sectional photograph (3500 times) of another example of the hollow fiber of the present invention.
- the composite fiber of the present invention is a core-sheath type composite fiber having a sheath part made of a water-insoluble thermoplastic polymer and a core part made of a water-soluble thermoplastic polymer.
- the water-soluble thermoplastic polymer constituting the core (core component) is solid at room temperature and can be dissolved and removed with a hydrophilic solvent (especially water) at a temperature of 120 ° C. or lower, and can be melt-spun.
- a hydrophilic solvent especially water
- water-soluble thermoplastic polymers include cellulosic resin (C alkyl cellulose ethers such as methyl cellulose,
- Hydroxy C alkyl cellulose ethers such as hydroxymethyl cellulose, carbo
- Carboxy C alkyl cellulose ethers such as xymethyl cellulose or salts thereof
- polyalkylene glycol resins poly C alkylene oxides such as polyethylene oxide, polypropylene oxide, etc.
- polybule resins polyvinyl pyrrolidone
- Polymer or a salt thereof) and polymers having a hydrophilic substituent polyyester, polyamide, polystyrene, or a salt thereof having a sulfonic acid group, a carboxyl group, a hydroxyl group, or the like).
- These water-soluble thermoplastic polymers can be used alone or in combination of two or more.
- water-soluble thermoplastic polymers in terms of excellent melt spinning stability and excellent water absorption, polybulal alcohol-based polymers such as polybulal alcohol, particularly water-soluble thermoplastic polyvinyl. Alcohol-based polymers (hereinafter sometimes simply referred to as “water-soluble thermoplastic 'PVA”) are preferred!
- the water-soluble thermoplastic PVA used in the present invention is not particularly limited as long as it can be melt-spun, and in addition to a homopolymer, for example, a functional group is introduced by copolymerization, terminal or side chain modification, and the like. Modified PVA is also included. In the present invention, preferably, as described later, by copolymerization A modified PVA with a reduced melting point.
- the viscosity average degree of polymerization (hereinafter simply referred to as the degree of polymerization) of the water-soluble thermoplastic polymer (for example, water-soluble thermoplastic PVA) used in the present invention is, for example, about 200 to 500, preferably Is about 230 to 470, more preferably about 250 to 450. If the degree of polymerization is too small, sufficient spinnability may not be obtained during spinning, and fiberization may be difficult. If the degree of polymerization is too high, the melt viscosity is too high, and it may be difficult to discharge the spinning nozzle polymer into a fiber form.
- thermoplastic polymer having such a degree of polymerization particularly a water-soluble thermoplastic PVA having a low degree of polymerization
- the water-soluble thermoplastic polymer such as a composite fiber cartridge is dissolved and removed with a hydrophilic solvent. If the dissolution rate is faster, the composite fiber force that is removed by force can reduce fiber shrinkage when dissolving and removing the water-soluble thermoplastic polymer.
- the degree of polymerization (P) of the water-soluble thermoplastic polymer is measured according to JIS-K6726.
- the degree of polymerization of water-soluble thermoplastic PVA can be determined by the following formula: the intrinsic viscosity [7?] (DlZg) force measured in water at 30 ° C after completely re-refining and purifying water-soluble thermoplastic PVA. Desired.
- ⁇ I ⁇ soluble thermoplastic PVA used in the present invention from the viewpoint of biodegradability, for example, a 90 to 99.99 mole 0/0, preferably about 92 to 99.98 mol 0 / 0 , more preferably 93 to 99.97 mol%. If the temperature is too small, the thermal stability of the water-soluble thermoplastic PVA may be poor and stable composite melt spinning may not be possible due to thermal decomposition or Gelich. On the other hand, if the temperature is too large, it is difficult to stably produce water-soluble thermoplastic PVA.
- the 1,2-glycol bond content of the water-soluble thermoplastic PVA is, for example, about 1 to 3 mol%, preferably 1.2 to 2.5 mol, based on the total butyl alcohol units. 0/0, preferably in the al 1. is about 3 to 1.9 mol%. If the 1,2-Daricol bond content in the water-soluble thermoplastic PVA is too low, the biodegradability of the water-soluble thermoplastic PVA will be too low. descend. On the other hand, if the 1,2-glycol bond content of water-soluble thermoplastic PVA is too high, the heat of water-soluble thermoplastic PVA Stability is lowered and spinnability is likely to be lowered.
- the melting point (Tm) of such a water-soluble thermoplastic PVA is, for example, about 160 to 230 ° C, preferably 170 to 227 ° C, more preferably 175 to 224 ° C (particularly 180 to 220 ° C). It is about ° C). If the melting point is too low, the crystallinity of the water-soluble thermoplastic PVA is lowered, the fiber strength of the composite fiber is lowered, the thermal stability of the composite fiber is deteriorated, and fiber formation may not be possible. On the other hand, if the melting point is too high, the melt spinning temperature becomes high, and the spinning temperature and the decomposition temperature of the water-soluble thermoplastic PVA approach each other.
- a core-sheath composite fiber composed of water-soluble thermoplastic PVA and polyester is used. May not be manufactured stably.
- the melting point of water-soluble thermoplastic PVA is as follows: DSC is used to increase the temperature to 250 ° C at a heating rate of 10 ° CZ in nitrogen, then cool to room temperature, and then again to 250 ° C at a heating rate of 10 ° CZ.
- the water-soluble thermoplastic PVA can be obtained by hatching the bull ester unit of the bull ester polymer.
- vinyl compound monomers for forming vinyl ester units include vinyl formate, butyl acetate, bispropionate, valerate, bispurate, laurate, stearate, benzoate, and pivalin.
- vinyl acid and versatic acid bur examples include vinyl acid and versatic acid bur.
- beryl compound monomers can be used alone or in combination of two or more.
- water-soluble thermoplastic PVA is highly productive, and lower aliphatic carboxylates such as vinyl acetate and vinyl propionate are preferred.
- the water-soluble thermoplastic PVA used in the present invention may be a homopolymer or a modified PVA introduced with copolymerized units, but from the viewpoint of melt spinnability, water solubility, and fiber physical properties. It is preferable to use a modified polybutyl alcohol introduced with copolymerized units.
- the copolymerizable monomer constituting the copolymer unit include a-olefins (such as ⁇ -C olefins such as ethylene, propylene, 1-butene, isobutene and 1-hexene),
- Acrylic acids [(meth) acrylic acid and its salts, (meth) acrylic acid C alkyl esters such as methyl (meth) acrylate], (meth) acrylamides [(meth) acrylamide, ⁇
- Ethers methyl vinyl ether, ethyl vinyl ether, ⁇ -propyl vinyl ether C alkyl, i-propyl butyl ether, n-butyl butyl ether, etc.
- hydroxyl group-containing bur ethers ethylene glycol vinylol ether, 1,3 propanediol vinylol ether, C alkanediol butyl ether such as 1,4 butanediol vinyl ether
- aryl ester ethylene glycol vinylol ether, 1,3 propanediol vinylol ether, C alkanediol butyl ether such as 1,4 butanediol vinyl ether
- allylic ethers such as C alkyl allyl ethers such as propyl allyl ether, butyl allyl ether, hexyl allyl ether
- oxy e.g., allylic ethers (such as C alkyl allyl ethers such as propyl allyl ether, butyl allyl ether, hexyl allyl ether), oxy
- Hydroxynes containing droxy groups or their esterified products isopropyl acetate, 3-butene 1 ol, 4 pentene 1 ol, 5 hexene 1 ol, 7— otaten 1 ol, 9 decene 1 ol, 3—methyl 3 butene C alkeneol such as 1-ol), N-bulamide (N-burformamide, N-biamide)
- N acrylamide tetra C alkyl ammonium chloride such as um chloride, N—
- N-acrylamide di-C alkylamines such as acrylamide dimethylamine, (meth) ary
- Di-C alkylarylamines such as oral rides, dimethylarylamine, and arylethylamines
- the content of these copolymerizable monomers is usually 20 mol% or less (for example, 0.01 to 20 mol%) in all monomers.
- water-soluble thermoplastic PVA may be about 0.1 to 20 mol%, preferably about 1 to 20 mol%, more preferably about 4 to 15 mol% (especially 6 to 13 mol%).
- modified PVA into which 4 to 15 mol% (especially 6 to 13 mol%) of ethylene and Z or propylene units (especially ethylene units) have been introduced is preferred because of high fiber properties and excellent fiberization processability. .
- the water-soluble thermoplastic polymer (for example, water-soluble thermoplastic PVA) used in the present invention can be prepared by a known method such as a bulk polymerization method, a solution polymerization method, a suspension polymerization method, or an emulsion polymerization method.
- a known method such as a bulk polymerization method, a solution polymerization method, a suspension polymerization method, or an emulsion polymerization method.
- bulk polymerization methods and solution polymerization methods in which polymerization is performed without solvent or in a solvent such as alcohol are usually employed.
- examples of alcohol used as a solvent include lower alcohols such as methyl alcohol, ethyl alcohol, and propyl alcohol.
- Initiators used in the copolymerization include ⁇ , ⁇ ′ — azobisisobutyric-tolyl, 2, 2 ′ — azobis (2, 4-dimethylmethylvalero-tolyl), and other peroxide initiators. And known initiators such as peroxide-based initiators such as azolyl and ⁇ -propyl peroxycarbonate. These initiators can be used alone or in combination of two or more.
- the polymerization temperature is not particularly limited, but a range of about 0 to 200 ° C (for example, 20 to 200 ° C), preferably about 0 to 150 ° C (for example, 30 to 100 ° C) is appropriate.
- plasticizer examples include (poly) alkylene glycol [polyethylene glycol, propylene glycol and its oligomer, butylene glycol and its oligomer, propylene oxide and ethylene.
- Random copolymer with oxide POZEO random copolymer, etc.
- polyhydric alcohols diglycerin, polyglycerin, (poly) glycerin alkylene oxide adduct, (poly) glycerin alkane carboxylic acid ester, sorbitol Alkylene oxide adduct, pentaerythritol alkylene oxide adduct, etc.
- plasticizers can be used alone or in combination of two or more.
- the proportion of these plasticizers is, for example, about 1 to 30% by mass, preferably about 2 to 20% by mass with respect to the water-soluble thermoplastic PVA from the viewpoint of improving the spinnability.
- an alkylene oxide adduct of sorbitol, a polydaricelin alkyl monocarboxylic acid ester, POZEO random copolymers, especially compounds with 1 to 30 moles of ethylene oxide per mole of sorbitol are preferred.
- the water-insoluble thermoplastic polymer constituting the sheath is a polymer that is not dissolved by a hydrophilic solvent (especially water) and can form fibers, such as polyolefin resin (polypropylene, polyethylene, ethylene propylene copolymer).
- polyester-based resin aromatic polyesters (polyethylene terephthalate (PET), polypropylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate) Phthalates, polyethylene naphthalate and other polyalkylene arylates, polyarylate, etc.), aliphatic polyesters (polyethylene adipate, polyethylene succinate, polybutylene succinate) , Aliphatic polyesters such as polybutylene succinate adipate and copolymers thereof; polylactic acid, polydalicolic acid, polyhydroxybutyrate, polymalic acid, glycolic acid lactic acid copolymer, polyhydroxybutyrate polyhydroxyvalerate copolymer Polylactides such as polymers; Polylatones such as poly-force prolatatatone and polypropiolatatones
- water-insoluble thermoplastic polymers can be used alone or in combination of two or more. Because of the complex spinning with water-soluble thermoplastic polymer (especially water-soluble thermoplastic PVA), the melting point of the water-insoluble thermoplastic polymer, which is the sheath component of the composite fiber, depends on the spinning stability and wide range of applications. In view of the possibility, it is preferably about 160 to 280 ° C (particularly 170 to 250 ° C).
- the water-insoluble thermoplastic polymer has an equilibrium moisture content of 2% by mass or less (for example, about 0.001 to 2% by mass, preferably about 0.01 to 1% by mass) at 23 ° C. and 50% RH.
- Thermoplastic polymers are preferred.
- the equilibrium moisture content means the moisture content of a polymer that has been allowed to stand in air at a certain humidity and temperature and has reached an equilibrium state, and is expressed as (equilibrium moisture Z dry mass) X 100 (%).
- polymers having such an equilibrium moisture content in particular polyolefin resin and Z or polyester resin, can exhibit the features of the production method of the present invention, and impart water absorption to the resulting hollow fibers.
- the point power that can be produced is also preferable.
- Specific examples of such polymers include polypropylene resin (polypropylene, etc.), C
- Polyester-based resin mainly polyethylene terephthalate-based resin, polypropylene terephthalate-based resin, polybutylene terephthalate-based resin), aliphatic polyester-based resin (such as polylactic acid) It is done.
- C furthermore, polyethylene terephthalate-based resin, polypropylene terephthalate-based resin, polybutylene terephthalate-based resin), aliphatic polyester-based resin (such as polylactic acid) It is done.
- C furthermore polyethylene terephthalate-based resin, polypropylene terephthalate-based resin, polybutylene terephthalate-based resin), aliphatic polyester-based resin (such as polylactic acid) It is done.
- rosin is another aromatic dicarboxylic acid (eg, isophthalic acid, 5-sodiumsulfoisophthalic acid, etc.), aliphatic dicarboxylic acid (eg, sebacic acid, adipic acid, etc.), etc.
- the copolymer component may be modified by copolymerization.
- the proportion of these copolymerization components on the order 50 mol% or less in the polyester-based ⁇ , preferably 0.1 to 30 molar 0/0, more preferably from 0.5 to 20 mole 0/0 (especially 1 10 mol 0/0) is about.
- these polymers aliphatic polyester-based coconut resins such as polylactic acid are also excellent in biodegradability, so that environmental power is also useful.
- Polypropylene resin and polyester resin can not be hollowed with an alkaline solution, and therefore the method of the present invention in which a core component is removed using a hydrophilic solvent (especially water) is optimal.
- these water-insoluble thermoplastic polymers have low water absorption, hollow fibers with high water absorption can be obtained.
- the core component and the sheath component constituting the composite fiber do not impair the object and effect of the present invention!
- a stabilizer a heat stabilizer such as a copper compound, an ultraviolet absorber, (Light stabilizers, antioxidants, etc.), fine particles, colorants, antistatic agents, flame retardants, plasticizers, lubricants, crystallization rate retarders and the like.
- These additives can be used alone or in combination of two or more. These additives can be added during the polymerization reaction or in the subsequent step.
- organic stabilizers such as hindered phenols, copper halide compounds such as copper iodide, and halogenated alkali metal compounds such as potassium iodide as heat stabilizers can improve the melt retention stability during fiberization. Since it improves, it is preferable.
- the water-insoluble thermoplastic polymer of the sheath component it is also preferable to add fine particles to the water-insoluble thermoplastic polymer of the sheath component in terms of quality stability.
- the average particle diameter of the fine particles is about 100 m or less, for example, 0.01 to 50 111, preferably 0.02 to 10 111, more preferably 0.03 to 1 / ⁇ ⁇ (particularly 0.05 to 0 About 5 m).
- fine particles fine particle inert substances are used.
- a silicon-containing compound (silica, silica sol, modified silica sol with improved dispersion stability), alumina compound (alumina, alumina sol, etc.), metal oxide (titanium oxide, etc.), metal carbonate
- alumina compound alumina, alumina sol, etc.
- metal oxide titanium oxide, etc.
- metal carbonate examples include inorganic fine particles such as salts (potassium carbonate, calcium carbonate sol, etc.), metal sulfates (barium sulfate, etc.).
- the fine particles may be a colloid of a fine particulate inert substance that has a refractive index close to the refractive index of a fiber (for example, polyester fiber) made of a water-insoluble thermoplastic polymer.
- the proportion of the fine particles is, for example, about 0.5 to: LO mass%, preferably about 1 to 5 mass% with respect to the mass of the water-insoluble thermoplastic polymer. Fine If the proportion of particles is too small, the effect of addition cannot be obtained, and if it is too large, the fiber forming processability tends to be poor.
- the core-sheath-type conjugate fiber of the present invention has an irregular cross-sectional shape in which the cross-sectional shape of the core part in the direction perpendicular to the length direction has protrusions, and the number of protrusions is 10 or more (for example, 10 to 200 Necessary) If the number of protrusions is less than 10, the effect of preventing see-through is reduced and the sag resistance is also reduced. Furthermore, when the hollow fiber obtained by using this composite fiber is used for the purpose of sucking up liquid by capillary action using the hollow part and flowing it into the pipe, if the number of protrusions is less than 10, Suction volume due to capillary action decreases.
- the number of protrusions is preferably about 15 or more (for example, 15 to 200), more preferably about 20 or more (for example, 20 to: LOO). If the number of protrusions is too large, the effect of the protrusions will be reduced because the distance between the protrusions will become extremely narrow not only because the spinneret becomes complicated.
- FIG. 1 An example of a cross-sectional shape of the core-sheath composite fiber of the present invention is shown in FIG.
- the fiber cross-section includes a sheath 1 made of a water-insoluble thermoplastic polymer and a core made of a water-soluble thermoplastic polymer.
- the core portion 2 has 50 to 70 (for example, approximately 60) protrusions (tongue-like or leaf-like protrusions) 3 extending in different outward directions in cross-sectional shape. Yes.
- this fiber includes a sheath portion 1 whose outer periphery is circular or elliptical in cross section and a core portion 2 surrounded by the sheath portion 1.
- the protrusions 3 extend from the core 2 at a predetermined interval (regular or irregular intervals) in the circumferential direction, and each protrusion 3 extends from the center (or near the center) of the core 2. It extends irregularly (or non-radially) in the radial direction (or outward direction).
- the shape of the core portion is such that a plurality of protrusions are provided in different outward directions (or radial directions and radial directions) from an appropriate position of the core portion (for example, a portion unevenly distributed from the shaft core portion, particularly the shaft core portion or the central portion). Even if the shape is extended, the force of the core part (shaft core part or center part) may be extended at regular intervals at regular intervals or irregularly at random intervals in the circumferential direction. It may be a shape.
- core The part usually has a plurality of projecting parts (or extending parts) extending in the radial direction from the shaft core part.
- the cross-sectional shape of the protrusion may be an irregular shape such as a triangular shape, a square shape, a rectangular shape, a plate shape, a tapered plate shape, an elliptical shape, or a branched shape.
- the protrusions having such an aspect ratio can improve the opacity of the resulting hollow fiber and give the fiber a swell.
- the individual protrusions need not have the same size and the same shape. In other words, the length and aspect ratio of each extension may be the same or different.
- the ratio of the outer peripheral length (L2) of the core portion and the outer peripheral length (L1) of the composite fiber satisfies the following formula (1).
- the ratio of the outer peripheral length (L2) of the core part to the outer peripheral length (L1) of the composite fiber X depends on the composite ratio of the core part.
- the changing force XZC value is preferably 1.6 or more (for example, 1.6 to 50), more preferably 2 or more (for example, 2 to 30), and even more preferably 2.5 or more (for example, 2. About 5-20).
- the ratio (L2ZL1) to the outer peripheral length (L1) of the composite fiber is preferably 0.8 or more (eg, 0.8 to 15), more preferably 1.2 or more (eg, 1.2 to 12), More preferably, it is 1.25 or more (for example, 1.25 to: LO). If the ratio of the outer peripheral length (L2) of the core component to the outer peripheral length (L1) of the composite fiber does not satisfy the formula (1), the individual protrusions become smaller even if the number of protrusions is large. The effect cannot be fully demonstrated.
- the sheath component Z core component about 90ZlO to 10Z90 (mass ratio), which is preferable. Or about 80 to 20 to 20 and more preferably about 70 to 30 to 70. If the ratio of the core component is too small, the cross-
- the core-sheath composite fiber of the present invention a part of the core component may be exposed on the fiber surface, but it is particularly preferable that almost the entire core component is covered with the sheath component. It is preferred that the core component is completely covered with the sheath component. If the exposed portion of the core component is too large, the hollow portion of the hollow fiber obtained by extracting the core component will be exposed on the surface, reducing heat retention and water absorption, and further reducing sag resistance. Therefore, it is preferable that the core-sheath type composite fiber has an open groove as described in, for example, JP-A-5-331701.
- the cross-sectional shape of the entire fiber including the sheath is not particularly limited, and in addition to the elliptical cross section shown in FIG. 1, a round cross section or other irregular cross section (for example, a polygonal cross section such as a tri-octagon) Flat cross section, T-shaped cross section, Y-shaped cross section, C-shaped cross section, etc.).
- the composite fiber using copolyester as the sheath component as described above has a vivid color developability.
- high glossiness is required as well as color development depending on the usage.
- glossy fibers have poor color developability, and conversely, if color developability is prioritized, it becomes difficult to impart gloss.
- vivid color development and gloss can be imparted to the fiber by using a specific fiber cross-sectional shape.
- a cross-sectional shape having a flat or smooth surface with a loose or curved deformity for example, an elliptical shape).
- Cross sections rectangular shapes, flat cross sections such as yarn-shaped cross sections, triangular cross sections, etc. are effective.
- a flat cross section such as a rectangular type or a thread type cross section, or a triangular cross section is optimal.
- FIG. 2 shows another example of the cross-sectional shape of the core-sheath composite fiber of the present invention.
- the fiber shown in FIG. 2 includes a sheath 1 having a circular cross section and a core 2 surrounded by the sheath 1, and leaf-like protrusions are regularly spaced from the core 2 in the circumferential direction.
- 3 extends in the radial direction (or radial direction)
- Each protrusion 3 extends about 25 to 35 (for example, about 30) regularly (or radially) with the central force of the core 2 also directed in the radial direction.
- the thickness of the composite fiber is not particularly limited, and can be set to an arbitrary thickness.
- L ldtex preferably 0.5 to 10 dtex, more preferably about 1 to 5 dtex.
- the composite fiber may be not only long fibers but also short fibers. Further, the number of multifilaments that may be multifilaments is, for example, 5 to: LOO, preferably 10 to 70, and more preferably about 20 to 50.
- the method for producing a conjugate fiber of the present invention is not particularly limited as long as the conjugate fiber having the structure is obtained.
- a core component is formed from a flow dividing plate provided with a number of pores corresponding to the number of protrusions formed of the core component.
- the composite flow is introduced toward the center of the inlet and discharged from the nozzle while covering the entire flow of the core component flowing through each pore force with the sheath component.
- the fiberizing conditions need to be set appropriately according to the combination of polymers and the composite cross section, but it is desirable to determine the fiberizing conditions mainly with the following points in mind.
- water-soluble thermoplastic polymers especially water-soluble thermoplastic PVA
- PVA water-soluble thermoplastic polymers
- jet pack aggregate of composite spun parts
- the spinning conditions are preferably in the following range.
- the spinneret temperature is, for example, about Mp ° C to (Mp + 80) ° C, preferably (Mp + 10), where Mp is the melting point of a polymer having a high melting point among the polymers constituting the composite fiber. It is about ° C to (Mp + 70) ° C, more preferably about (Mp + 20) ° C to (Mp + 60) ° C.
- the shear rate ( ⁇ ) in spinning is about 1,000 to 25, OOOsec—preferred ⁇ is 1,000 to 20, OOOsec ” 1 , and more preferably is about 1,500 to 10 , OOOsec— 1 .
- the draft (V) in spinning is, for example, about 10 to: L00 0, preferably about 10 to 500, and preferably about 20 to 400.
- (3) Combining force of polymer to be combined When viewed, a polymer having close melt viscosity as measured by a die temperature during spinning and a shear rate when passing through the nozzle, for example, at a melt spinning die temperature, a shear rate Combined spinning with a combination in which the melt viscosity difference in lOOOOsec- 1 is within 2000 poise (preferably within 1500 boise) is also preferable in terms of spinning stability.
- the melting point (Tm) of the polymer in the present invention is the peak temperature of the main endothermic peak observed with a differential scanning calorimeter (DSC: for example, trade name “TA3000” manufactured by Mettler). It is.
- the spinneret temperature is lower than the melting point (Tm) of the water-soluble thermoplastic polymer (especially water-soluble thermoplastic PVA), and the water-soluble thermoplastic polymer does not melt at that temperature. Can not be spun.
- Tm melting point
- the spinneret temperature is too high, the water-soluble thermoplastic polymer is likely to be gelated due to thermal decomposition or self-crosslinking, so that the spinnability is lowered.
- the shear rate is too low, the yarn will be broken or if it is too high, the back pressure of the nozzle will increase and the spinnability will decrease. If the draft is too low, unevenness of the fineness will increase and stable spinning will be achieved, while if the draft is too high, it will be easy to break the yarn.
- the yarn discharged from the spinning nozzle may be wound at a high speed as it is without being stretched. It may be stretched as necessary. Drawing is performed at a draw ratio of 0.5 5 to 0.9 times (preferably 0.6 to 0.8 times) with respect to the breaking elongation (HDmax) of the composite fiber, and the glass transition point (Tg) of the composite fiber. It may be stretched at the above temperature.
- Stretching may be performed subsequent to stretching, in which the film may be removed after being discharged from the spinning nozzle and the force may be stretched.
- the stretching method is usually a hot stretching method using hot air, a hot plate, a hot roller, a water bath, or the like.
- the drawing step the larger the absolute value of the draw ratio, the easier it is to generate fluff and break the yarn. Therefore, the fiber forming conditions from high speed spinning to low draw ratio or the known high speed spinning method is preferred. .
- the drawing temperature is appropriately set according to the combination of the polymers constituting the composite fiber.
- water-soluble thermoplastic PVA is used as the water-soluble thermoplastic polymer
- the crystallization speed of the water-soluble thermoplastic PVA is high. Therefore, the crystallization of the undrawn yarn has progressed considerably, and plastic deformation of the crystal part hardly occurs before and after Tg.
- a relatively high temperature for example, 70 to: LOO Stretch at a temperature of about ° C, preferably about 75-95 ° C.
- the temperature is set to about 150 to 200 ° C. at a higher temperature.
- the cross-sectional shape of the composite fiber can be prepared by selecting a spinning nozzle having an elliptical shape, a perfect circular shape, a flat shape, a triangular shape, or the like according to the shape of the fiber.
- the shrinkage of the composite fiber accompanying dissolution is adjusted by adjusting the production conditions in the subsequent step of dissolving the water-soluble thermoplastic polymer (particularly water-soluble thermoplastic PVA) as the core component with a hydrophilic solvent.
- the behavior can be controlled.
- a method in which heat treatment is performed on the composite fiber in advance is desirable. This heat treatment may be performed at the same time as stretching in the fiberizing step accompanying stretching, or may be performed separately from stretching.
- Increasing the heat treatment temperature can lower the maximum shrinkage of hollow fibers obtained by dissolving the core component, but conversely, the melting temperature of the core component in water tends to increase. It is desirable to set the heat treatment conditions while looking at the balance with the maximum shrinkage in the process.
- the conditions are set within the range of the glass transition point of water-insoluble thermoplastic resin (particularly water-insoluble thermoplastic PVA) constituting the core component to (Tm-10) ° C. preferable.
- the treatment temperature is too low, a sufficiently crystallized composite fiber cannot be obtained.
- the shrinkage when the fabric is heat set is increased, and the fabric texture is hardened.
- the treatment temperature is too high, sticking between fibers occurs, which is not preferable.
- the heat treatment may be performed by shrinking the drawn composite fiber! ⁇ .
- shrinkage When shrinkage is applied to the composite fiber, the shrinkage rate of the composite fiber until the water-soluble thermoplastic polymer is dissolved in the hydrophilic solvent decreases.
- the applied shrinkage is, for example, 0.01 to 5 with respect to the fiber length direction. It is preferable to contract at a rate of%, preferably 0.1 to 4.5%, more preferably about 1 to 4%. If the shrinkage applied is too small, the effect of reducing the maximum shrinkage of the composite fiber in dissolving the water-soluble thermoplastic polymer is not practically obtained, and if the applied shrinkage is too large, the composite fiber relaxes during the shrinking process. I can't stabilize the contraction.
- a hollow fiber composed of a water-insoluble thermoplastic polymer is obtained by dissolving the water-soluble thermoplastic polymer in a hydrophilic solvent and removing it from the composite fiber thus obtained. Further, the water-soluble thermoplastic polymer may be dissolved and removed with a hydrophilic solvent after the fiber structure is produced with the composite fiber.
- hydrophilic solvents examples include water, alcohols (methanol, ethanol, isopropanol, butanol, etc.), ketones (acetone, etc.), ethers (dioxane, tetrahydrofuran, etc.), cellosolves (methyl cereal). And carbitols (such as carbitol, diethylene glycol dimethyl ether, and ethylene glycol methyl ethyl ether). These hydrophilic solvents can be used alone or in combination of two or more. Among these hydrophilic solvents, water, C alcohols such as ethanol, ketones such as acetone, water and other hydrophilic solvents
- the aqueous solution to be used may be any of an alkaline aqueous solution and an acidic aqueous solution, and may contain a non-on type N-on type surfactant.
- a water-soluble thermoplastic polymer particularly water-soluble thermoplastic PVA
- water-soluble means that the temperature is 40 ° C or higher regardless of the length of time until dissolution. It means to dissolve in water at an appropriate temperature. Then, by changing the type of the water-soluble thermoplastic polymer that is the core component and the production conditions of the composite fiber, in the present invention, it is possible to obtain a composite fiber in which the water dissolution temperature of the core component is about 30 to 100 ° C. In order to balance all the properties of practicality and water solubility, water soluble with a melting temperature of 40 ° C or higher It is preferable to use a composite fiber having a heat-resistant thermoplastic polymer as a core component.
- the solution treatment temperature (especially the hydrothermal treatment temperature) is determined depending on the solution temperature of the water-soluble thermoplastic polymer (particularly the water-soluble thermoplastic PVA) or the wetness of the water-insoluble thermoplastic polymer constituting the sheath component of the composite fiber (Wet ) Should be adjusted appropriately according to the glass transition point in the state.
- the higher the processing temperature the shorter the processing time.
- the glass transition point of the water-insoluble thermoplastic polymer that is the sheath component is 70 ° C or higher, it is 100 ° C or higher. Hot water treatment under high temperature and pressure is most preferred.
- the temperature and time in the hydrothermal treatment depend on various requirements such as the fineness of the composite fiber, the ratio of the core component in the composite fiber, the ratio and type of the water-insoluble thermoplastic polymer of the sheath component, and the form of the fiber structure. It can be adjusted as appropriate.
- the hydrothermal treatment temperature is, for example, about 60 ° C. or higher (eg, 60 to 200 ° C.), preferably about 80 ° C. or higher (eg, 80 to 180 ° C.).
- Examples of the hot water treatment method include a method of immersing the composite fiber or the fiber structure in the hot water liquid, a method of applying the hot water liquid to the pad by a method such as a pad or a spray, and drawing the liquid. be able to. In order to completely remove the core component from the composite fiber, these operations may be repeated a plurality of times. On the other hand, depending on the purpose (application), a part of the water-soluble thermoplastic polymer (particularly water-soluble thermoplastic PVA) of the core component may remain in the fiber!
- the core portion has a large number of protrusions as in the present invention
- a lot of hot water and a long time are required.
- the water absorption of the hollow fiber is improved because a part of the water-soluble thermoplastic polymer (particularly, the water-soluble thermoplastic PVA) remains in the hollow portion. Therefore, in the present invention, it is preferable to leave a part of the water-soluble thermoplastic polymer in the hollow portion (hollow inner wall) of the fiber rather than completely removing the water-soluble thermoplastic polymer.
- water-soluble thermoplastic PVA is excellent in hygroscopicity and moisture retention, so this characteristic can be applied to dissolve and remove part of the water-soluble thermoplastic PVA to form voids and at the same time form water-soluble thermoplastic PVA as the core component.
- U prefer to leave some.
- the confirmation of whether or not the water-soluble thermoplastic polymer remains in the hollow portion of the fiber can be made by confirming the ratio force of the water-soluble thermoplastic polymer component removed by extraction. Force
- the water-soluble thermoplastic polymer is water-soluble thermoplastic PV A, it can also be confirmed by using the following method.
- the water-soluble thermoplastic polymer particularly the water-soluble thermoplastic PVA
- the water-soluble thermoplastic PVA can be removed as an aqueous solution from the composite fiber cartridge by the hydrothermal treatment as described above.
- PVA is biodegradable, and when it is treated with activated sludge or embedded in soil, it is decomposed into water and carbon dioxide.
- dissolved and removed water-soluble thermoplastic PVA is almost completely decomposed in 2 days to 1 month when continuously treated with activated sludge in the form of an aqueous solution.
- the hollow fiber of the present invention is composed of a water-insoluble thermoplastic polymer having a special-shaped hollow part by selectively removing the water-soluble thermoplastic polymer in the composite fiber by hot water treatment.
- Hollow fibers are produced.
- water-insoluble thermoplastic polymers which are considered to hardly swell in water (especially, 85 mol% or more of the basic skeleton are polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, etc.).
- the core component completely surrounded by the sheath component composed of polyester, polypropylene, etc.) is easily dissolved and removed by hot water treatment to form a specially shaped hollow fiber. Made.
- the end surface force of the fiber is a force that the water-soluble thermoplastic polymer can easily be removed. Even in such a state, the water-soluble thermoplastic polymer can be easily dissolved and removed, and this fact is a technology that cannot be easily conceived by the state of the art.
- polyester fibers and polypropylene fibers having a hollow structure have been difficult to produce by adding a foaming agent or by a very special method.
- the composite fiber of the present invention it is extremely reasonable. And it becomes possible to manufacture practically.
- the hollow fiber obtained in this way has a hollow portion inside the fiber, and when most of the water-soluble thermoplastic polymer of the core component is almost removed, the shape of the hollow portion is the composite fiber.
- the shape corresponds to the shape of the fiber core. That is, the hollow part shape of the hollow fiber has the shape of the core part described in the section of the core-sheath type composite fiber.
- the hollow fiber of the present invention has a cross-sectional shape in a direction perpendicular to the length direction.
- the deformed cross-sectional shape has ten or more protrusions extending inward from the inner wall .
- FIG. 3 is an electron micrograph of an example of the hollow fiber of the present invention obtained by extracting and removing the core component from the conjugate fiber shown in FIG.
- the hollow fiber has about 50 to 70 (for example, about 60) protrusions (needle-like or tapered plate-like protrusions) extending inward from the inner wall.
- the protrusions of the hollow fibers extend from the inner wall at regular or non-regular intervals in the circumferential direction and directed in the central direction (or inward direction).
- FIG. 4 is an electron micrograph of another example of the hollow fiber of the present invention obtained by extracting and removing the core component from the conjugate fiber shown in FIG.
- the hollow fiber shown in FIG. 4 has a cross-sectional shape in which the inner wall force is directed toward the center of the hollow portion, and about 25 to 35 tapered plate-like protrusions (for example, about 30) extend at regular intervals. .
- the cross-sectional shape of the protruding portion of the inner wall may be a rectangular shape such as a rectangular shape, an elliptical shape, or a different shape such as a branched shape, but a needle shape or a tapered plate shape is preferred.
- Protrusions having such an aspect ratio are formed on the inner wall of the hollow portion, so that the opacity of the hollow fiber (prevents see-through). (Stickiness) can be improved, and the fiber can be provided with a feeling of swelling (sag resistance), and the color development of the fiber can also be improved.
- the individual protrusions need not have the same size and the same shape. That is, the length of each protrusion may be the same or different.
- the area ratio (hollow rate) of the hollow part in the cross section of the hollow fiber of the present invention is 5% or more (for example, about 5 to 90%), preferably 5 to 70%, more preferably about 5 to 50%. It may be. If the hollow ratio is too low, lightness, anti-slipping property, bulging feeling, etc. may not be sufficiently exhibited. If the area ratio of the hollow portion is too large, the fiber strength decreases. Furthermore, from the viewpoint of achieving both lightness and a feeling of swelling, the hollow ratio is preferably 45 to 90%, more preferably 50 to 90% (particularly 50 to 70%)! / ⁇ .
- the hollow fiber of the present invention may have a water-soluble thermoplastic polymer on at least a part of the hollow inner wall as described above.
- the ratio of the water-soluble thermoplastic polymer in the hollow fiber can be selected from a range force of 50 parts by mass or less (for example, 0.0001 to 50 parts by mass) with respect to 100 parts by mass of the hollow fiber, preferably 0.01 to 20 It is about 0.1 to 10 parts by mass (particularly 0.5 to 5 parts by mass), more preferably about 0.1 to 10 parts by mass.
- the surface of the hollow fiber of the present invention does not have, for example, an opening groove that also has a hollow portion force.
- the hollow fiber of the present invention is excellent in light weight, opacity (prevention of see-through), heat retention, heat insulation, and swell (resistance to sag), so that it can be used in various applications such as clothing, It can be used for non-woven fabric applications (such as various types of filters), medical applications (such as medical materials and sanitary materials), and various living materials (such as filling materials).
- the fiber laminate can be used as an interior material for automobiles, a silencer, and a vibration-proof material, and can also be used for papermaking. Furthermore, it can also be used, for example, for agricultural and horticultural applications as a fiber for water absorption or water passage utilizing the capillary phenomenon of the hollow portion.
- Example [0085] Next, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. Details of the water-insoluble thermoplastic polymer used in the examples are shown below. Further, in the examples, each physical property value was measured as follows. In the examples, “part” and “%” relate to mass unless otherwise specified.
- PBT Polybutylene terephthalate (melting point 226 ° C, equilibrium moisture content: 0.4%)
- SIP1 7coPET 5- Seo Jiu arm sulfoisophthalic acid 1.7 mol 0/0 copolymerized polyethylene te terephthalate (melting point: 255 ° C, the equilibrium moisture content: 0. 4%)
- PET Polyethylene terephthalate (melting point: 260 ° C, equilibrium moisture content: 0.4%)
- PLLA Polylactic acid (melting point: 170 ° C, equilibrium moisture content: 0.4%)
- PPT Polypropylene terephthalate (melting point: 230 ° C, equilibrium moisture content: 0.4%)
- PP Polypropylene (melting point: 180 ° C, equilibrium moisture content: 0%)
- Each of these water-insoluble thermoplastic polymers contains titanium oxide (manufactured by Kronos Co., Ltd., average particle size 0.5 111) in a proportion of 0.045% by mass.
- water-soluble thermoplastic PVA was analyzed according to IS-K6726.
- the amount of modification was determined by measurement with a 500 MHz proton NM R (manufactured by JEOL Ltd., GX-500) using a modified polybule ester or modified PVA.
- the melting point of the water-soluble thermoplastic PVA was DSC (Mettler, TA3000), the temperature was raised to 250 ° C in nitrogen at a rate of temperature increase of 10 ° C, cooled to room temperature, and again the temperature increase rate of 10 The temperature at the top of the endothermic peak showing the melting point of PVA when the temperature was raised to 250 ° C in ° CZ minutes.
- T o is the water-soluble constituent of the composite fiber This is the melting temperature of thermoplastic PVA in hot water.
- T o +40
- dtex the melting temperature of thermoplastic PVA in hot water.
- the cross-section of the composite fiber was photographed with a scanning electron microscope (SEM), and the average value was calculated from the area of the core portion of the core-sheath fiber and the total cross-sectional area of the composite fiber in the cross-section of 10 fibers. Further, the average value of the ratio (L2ZL1) of the outer peripheral length (L2) of the core portion to the outer peripheral length (L1) of the composite fiber was determined from the same photograph. Furthermore, for the number of protrusions, the same photographic power was counted and the average value was used.
- the hollow area ratio was calculated by taking an SEM photograph of the cross section of the hollow fiber and calculating the average value from the area of the hollow portion of the special shape and the entire area of the hollow fiber in the cross section of 10 fibers. Further, from the same photograph, the average value of the ratio (L4 / L3) of the outer peripheral length (L4) of the hollow portion to the outer peripheral length (L3) of the hollow fiber was determined.
- the lightness of the woven fabric was evaluated according to the following criteria by a panelist sensory test.
- the fabric was evaluated by 10 panelists and evaluated according to the following criteria. In the table, the average overall evaluation (sensory evaluation) of V and the texture was also commented.
- ⁇ Five to six people are judged to be excellent in lightness and bulge.
- the shading rate was measured by the JIS-L1055A method.
- a 100 liter pressurized reactor equipped with a stirrer, nitrogen inlet, ethylene inlet, and initiator pressure was charged with 29 kg of vinyl acetate and 3 lkg of methanol, heated to 60 ° C, and nitrogen publishing for 30 minutes. The system was replaced with nitrogen. Subsequently, ethylene was introduced so that the reactor pressure was 5.9 kg / cm 2 (5.8 ⁇ 10 5 Pa).
- AMV 2, 2, 1-azobis (4-methoxy-2,4-dimethylbareto-tolyl)
- a 5% aqueous solution of purified modified PVA was prepared to prepare a cast film having a thickness of 10 microns.
- the film was dried under reduced pressure at 80 ° C. for 1 day, and then the melting point of PVA was measured by the above-described method using DSC (manufactured by Metra Co., Ltd., TA3000), and found to be 208 ° C.
- ethylene-modified PVA as the core component and isophthalic acid-modified polyethylene terephthalate (IPA6coPET) containing titanium oxide as the sheath component
- PVA zone maximum temperature 230 ° C After spinning at a spinning temperature of 260 ° C and a spinning speed of 1800mZ, the undrawn yarn was brought into contact with a 83 ° C hot roller and a 140 ° C hot plate, and the draw ratio was 2.3.
- a plain woven fabric was prepared using the composite fiber as warp and weft.
- the green machine density was 95 warps Z25.4 mm and 86 wefts Z25.4 mm.
- This raw fabric is dipped in an aqueous solution containing 2 gZL of sodium carbonate at 80 ° C for 30 minutes. After that, presetting was performed at 170 ° C for about 40 seconds.
- hot water with a water ratio of 50: 1, a temperature of 120 ° C, and a duration of 40 minutes in an aqueous solution containing an ionic surfactant (Mentari Kagaku Co., Ltd., Intol MT Conc.) Processing was performed.
- the fabric composed of the hollow fibers of this example had a very light weight feeling and had an excellent texture with swelling, anti-slipping property, heat retaining property, and heat shielding property. Furthermore, the fibers had excellent water absorption.
- Example 2 changes the ratio of the sheath part to the core part and the removal rate of the core component
- Examples 3 to 5 show Example 1 except that the removal rate of the core component is changed to the conditions shown in Table 1.
- fiberization, fabric preparation and evaluation were performed. The results are shown in Table 2.
- Comparative Examples 1 and 2 were carried out in the same manner as Example 1 except that the number of protrusions of the core component was changed.
- the fabric of Comparative Example 1 was inferior in the see-through preventing property in which both the feeling of swelling and the feeling of softness were combined.
- the fabric of Comparative Example 2 was slightly inflated and soft, but was inferior in see-through prevention.
- Sheath component Removal rate Area ratio Denatured amount after removal Saponification point Melting point Sheath / core Hollow part
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Abstract
Description
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EP3024881A1 (en) * | 2013-07-26 | 2016-06-01 | Hewlett-Packard Development Company L.P. | Composite support material for three-dimensional printing |
JP2018035318A (ja) * | 2016-09-02 | 2018-03-08 | 株式会社日本触媒 | 重合体の表面親水化処理方法、表面親水化物品の製造方法および表面親水化物品 |
JP2018532847A (ja) * | 2015-09-30 | 2018-11-08 | ヒューヴィス コーポレーションHuvis Corporation | ポリエステル樹脂発泡層と繊維層を含む自動車内外装材 |
JP2020147874A (ja) * | 2019-03-15 | 2020-09-17 | 加茂繊維株式会社 | 紡績糸、蓄熱性繊維構造物および蓄熱性繊維構造物の製造方法、ならびに蓄熱性紡績糸および蓄熱性紡績糸の製造方法 |
WO2023127700A1 (ja) * | 2021-12-27 | 2023-07-06 | 株式会社クラレ | ビニルアルコール共重合体、ならびにそれを含む樹脂組成物、および樹脂成形体 |
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2005
- 2005-07-26 WO PCT/JP2005/013666 patent/WO2006011490A1/ja active Application Filing
- 2005-07-26 JP JP2006527804A patent/JP4951340B2/ja not_active Expired - Fee Related
Patent Citations (3)
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JPH05331701A (ja) * | 1992-05-29 | 1993-12-14 | Kanebo Ltd | 中空合成繊維 |
JP2002201527A (ja) * | 2000-12-26 | 2002-07-19 | Nippon Ester Co Ltd | 異形断面中空繊維 |
JP2004052161A (ja) * | 2002-07-22 | 2004-02-19 | Kuraray Co Ltd | 特殊断面繊維 |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3024881A1 (en) * | 2013-07-26 | 2016-06-01 | Hewlett-Packard Development Company L.P. | Composite support material for three-dimensional printing |
EP3024881A4 (en) * | 2013-07-26 | 2017-03-29 | Hewlett-Packard Development Company L.P. | Composite support material for three-dimensional printing |
US9745458B2 (en) | 2013-07-26 | 2017-08-29 | Hewlett-Packard Development Company, L.P. | Composite support material for three-dimensional printing |
JP2018532847A (ja) * | 2015-09-30 | 2018-11-08 | ヒューヴィス コーポレーションHuvis Corporation | ポリエステル樹脂発泡層と繊維層を含む自動車内外装材 |
JP2018035318A (ja) * | 2016-09-02 | 2018-03-08 | 株式会社日本触媒 | 重合体の表面親水化処理方法、表面親水化物品の製造方法および表面親水化物品 |
JP2020147874A (ja) * | 2019-03-15 | 2020-09-17 | 加茂繊維株式会社 | 紡績糸、蓄熱性繊維構造物および蓄熱性繊維構造物の製造方法、ならびに蓄熱性紡績糸および蓄熱性紡績糸の製造方法 |
JP7323910B2 (ja) | 2019-03-15 | 2023-08-09 | 加茂繊維株式会社 | 紡績糸、蓄熱性繊維構造物および蓄熱性繊維構造物の製造方法、ならびに蓄熱性紡績糸および蓄熱性紡績糸の製造方法 |
WO2023127700A1 (ja) * | 2021-12-27 | 2023-07-06 | 株式会社クラレ | ビニルアルコール共重合体、ならびにそれを含む樹脂組成物、および樹脂成形体 |
Also Published As
Publication number | Publication date |
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JPWO2006011490A1 (ja) | 2008-05-01 |
JP4951340B2 (ja) | 2012-06-13 |
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