Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/53—Polyethers
• • 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
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/507—Polyesters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2904—Staple length fiber
  • Y10T428/2907—Staple length fiber with coating or impregnation
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2904—Staple length fiber
  • Y10T428/2909—Nonlinear [e.g., crimped, coiled, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]

Definitions

• the present invention relates to a polyester-based heat-adhesive conjugate short fiber suitable for bonding a fibrous structure such as a nonwoven fabric or wadding and a method for producing the same. More specifically, the present invention relates to a heat-adhesive conjugate staple fiber which can be heat-fixed at a relatively low temperature and can stably obtain a fiber structure having good dimensional stability, and a method for producing the same. is there. Background art
• polyester-based heat-adhesive conjugate fibers have a polyalkylene terephthalate such as polyethylene terephthalate as a core component, and do not have a crystalline melting point with an isophthalic acid component and a terephthalic acid component as a constituent acid component.
• conjugate fibers containing amorphous polyester as a sheath component can be heat-fixed at a relatively low temperature of 120 to 150 ° C and can be used to form fiber structures without the need for high-temperature heat treatment. Have been.
• polyester-based heat-adhesive conjugate fibers can be formed into a fiber structure at a relatively low temperature, but when the obtained fiber structure is used in a high-temperature atmosphere, the dimensional stability is poor and the deformation is large. There is a problem.
• the present inventors have attempted to draw or heat-treat at a high temperature in order to improve the dimensional stability of the heat-bondable fiber itself if this problem is not solved. Temperature above point transfer It was found that there was a problem in that the fibers were stuck together, making it difficult to spin.
• non-crystalline polyesters particularly those having excellent dimensional stability in heat-adhesive conjugate fibers containing non-crystalline polyester having a glass transition point of 50 to 100 ° C. as a heat-adhesive component, are: The fact is that it has not been proposed yet. Disclosure of the invention
• An object of the present invention is that high-temperature heat treatment is not required, heat fixation can be performed at a relatively low temperature, and dimensional stability is good even when used in a high-temperature atmosphere, and deformation is unlikely, and high quality is achieved.
• An object of the present invention is to provide a polyester-based heat-adhesive conjugate short fiber from which a fibrous structure such as a nonwoven fabric or wadding can be obtained and a method for producing the same.
• the present inventors considered that an amorphous polyester having a glass transition point of 50 to 100 ° C was used as a heat-adhesive component, and polyalkylene terephthalate was used as a fiber-forming material. The inventors have found that it is effective to select the hot stretching conditions as well as the components, and have completed the present invention.
• the polyester-based heat-adhesive conjugate short fibers of the present invention that can achieve the above-mentioned object are obtained by converting an amorphous polyester having a glass transition point of 50 to 100 ° C and having no crystal melting point into a heat-adhesive component.
• This is a heat-adhesive conjugate short fiber containing a polyalkylene terephthalate having a melting point of 220 ° C or more as a fiber-forming component, and has a crimp number of 3 to 40 pieces Z 25 mm, crimp It is characterized by a rate of 3 to 40% and a web area shrinkage rate defined below of 20% or less.
• thermoadhesive conjugate short fibers Composed of 100% thermoadhesive conjugate short fibers, area A. ,
• the basis weight The card web nonwoven fabric of 30 g / m 2 is left in a hot air drier maintained at 150 for 2 minutes, and the area A of the nonwoven fabric is measured thereafter, and is calculated by the following formula.
• another method for producing a polyester-based heat-adhesive conjugate short fiber which is another object of the present invention, is a non-crystalline polyester having a glass transition point of 50 to 100 and no crystalline melting point, and a melting point of 2%.
• Polyalkylene terephthalate at 20 ° C or higher is melted and composite-discharged, and the composite-discharged yarn is cooled and solidified, and then taken up at a speed of 1500 m / min or less to form an undrawn composite fiber. None.
• the mixture was cooled at a temperature of T T to (T 2 + 30 ° C.).
• the maximum stretching ratio is 0.72 to 1.25 times, and the number of crimps is 3 to 40 pieces / 25 mm, and the crimp rate is 3 to 40%. Crimping is provided.
• T E is either higher temperature among the glass transition point and a poly A Rukirenterefuta rate of the glass transition point of the amorphous polyester
• T 2 is the glass transition point of the amorphous poly esters.
• polyalkylene terephthalate having a melting point of 220 ° C. or more is used. If the melting point of the polyester, which is a fiber-forming component, is lower than 220 ° C., not only is it difficult to stably produce the conjugate fiber, but also the stability during the heat bonding treatment is reduced.
• polyalkylene terephthalate polyethylene terephthalate and polybutylene tereate are preferred.
• a small amount of a copolymer component, an anti-glazing agent, and additives such as a coloring agent and a lubricant may be contained.
• polyethylene terephthalate is more preferable because it is inexpensive and general-purpose.
• a polyester having a glass transition point of 50 to 100 and having no crystalline melting point is used as the non-crystalline polyester as the heat-adhesive component.
• the glass transition point of the polyester is less than 50 ° C., it is possible to obtain a conjugate fiber excellent in dimensional stability with an area shrinkage of not more than 20% and a fiber liable to stick during drawing by a production method described later. Is not preferred because On the other hand, when the glass transition point exceeds 100 ° C., the heat fixability at a low temperature of 120 to 150 ° C. is unfavorably deteriorated.
• Such amorphous polyesters include, for example, terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 5—sodium sulfoisophthalic acid, adipic acid, sebacic acid, azelaic acid, dodecane Dicarboxylic acid, 1,4-cyclohexane Dicarboxylic acid and other acid components, ethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexane Examples include random or block copolymers of diol components such as diol, diethylene glycol 1,6-cyclohexanediol, and 1,4-cyclohexanedimethanol. Among them, an amorphous copolyester composed of a terephthalic acid component, an isofluric acid component, an ethylene glycol component and a diethylene glycol component is preferred from the viewpoint
• the thermal adhesive component As the thermal adhesive component, the above terephthalic acid component, isofluric acid component, ethylene glycol component and diethylene glycol component are used. In the case of using copolymerized polyester consisting of two components, it is necessary to set the copolymerization ratio so that the glass transition point falls within the above range.However, the molar ratio of the terephthalic acid component to the isophthalic acid component is 5%. The range of 0:50 to 80:20 is suitable, while the molar ratio of ethylenedalicol to diethylene glycol can be arbitrarily selected within the range of 0: 10000 to 100: 0: 0.
• the heat-adhesive component occupies all or a part of the fiber surface (preferably, 40% or more, particularly 60% or more of the fiber surface area).
• any of composite forms such as a core-in-sheath type, an eccentric core-in-sheath type, a side-by-side type, a sea-island type, and a split-fiber type may be used.
• the core-sheath type, the eccentric core-sheath type, and the side-by-side type are more preferable.
• the number of crimps of the heat-adhesive conjugate short fiber of the present invention is 3 to 40 pieces, 25 mm, and the crimp rate is 3 to 40%.
• the number of crimps is less than 3 pieces / 25 mm or the crimp rate is less than 3%, the entanglement between short fibers is insufficient, and the card passing property is deteriorated. It is not preferable because the body cannot be obtained.
• the number of crimps exceeds 40/25 mm or the crimp rate exceeds 40% the entanglement between the short fibers becomes too large and it is possible to make enough carding with a card. This is not preferable because a high-quality fiber structure cannot be obtained.
• the number of crimps is in the range of 5 to 30 crimps, and the crimp ratio is in the range of 5 to 30%.
• the form of the crimp may be a mechanical crimp or a three-dimensional crimp, and may be appropriately selected and set according to the use or purpose.
• the fiber length and single fiber fineness do not need to be particularly limited, and may be appropriately set according to the application or purpose.
• the web area shrinkage as defined below is less than 20%. This makes it possible to obtain a fiber structure having excellent dimensional stability even in a high-temperature atmosphere by mixing the conjugate fiber with 100% or other fibers. If the shrinkage exceeds 20%, a fiber structure having excellent dimensional stability in a high-temperature atmosphere cannot be obtained.
• a more preferable web area shrinkage rate is 10% or less ⁇ web area shrinkage rate>
• the area is A, consisting of 100% of heat-fusible short fibers.
• a nonwoven fabric having a basis weight of 30 g Zm 2 was left in a hot air dryer maintained at 150 ° C. for 2 minutes, and the area A of the nonwoven fabric was measured.
• the polyester-based heat-adhesive conjugate short fibers of the present invention described above can be efficiently produced by, for example, the following method.
• the above-mentioned amorphous polyester and polyalkylene terephthalate are compounded, preferably mixed into a core-in-sheath type, an eccentric core-in-sheath type or a side-piside type, and melt-discharged.
• the yarn is drawn at a speed of 1500 m / min or less to form an undrawn conjugate fiber.
• the mixture is cooled at a temperature of T to (T 2 + 30 ° C.).
• T 2 the temperature of T to (T 2 + 30 ° C.).
• the crimps are further stretched so that the number of crimps is 3 to 40 / ⁇ SS mm and the crimp rate is 3 to 40%. It can be manufactured by applying and cutting to a desired length.
• T 2 refers to the glass transition temperature of the non-crystalline polyester.
• the first point in the above-mentioned production method is to apply a polyester polyester block copolymer to the surface of the conjugate fiber before drawing the undrawn conjugated composite fiber. Or Kusuru Ri by the and this, be stretched at a high temperature of at least (corresponding to i.e. the softening point of the amorphous copolymerizable polyester) the glass transition point T 2 of the non-crystalline poly ester, stretching temperature T 2 + 3 If the temperature is 0 ° C.
• polyester-based heat-adhesive conjugate short fibers having a web surface shrinkage of 20% or less can be obtained without causing fiber sticking in the drawing step.
• the thermal adhesiveness does not decrease so much, so that a fiber structure excellent in mechanical properties can be obtained.
• the dicarboxylic acid component is composed of a terephthalic acid component, an isophthalic acid component and Z or an alkali metal salt sulfoisophthalic acid component, and the molar ratio thereof is from 40:60 to 1: 1. 0: 0, and a polyalkylene glycol having a daricol component of ethylene glycol and a number average molecular weight in the range of 600 to 1000 is 20 to 95% by weight.
• acid components such as adipic acid, sebacic acid, azelaic acid, dodecanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-propanediol, 1,4-butanediol, 1,5-pentane
• Diol components such as diol, 1,6-hexanediol diethylene glycol, 1,4-cyclohexanediol, and 14-cyclohexanedimethanol may be co-polymerized in a small amount, and the molecular weight is adjusted.
• one end group of the polyalkylene glycol may be blocked by an ether bond such as monomethyl ether, monoethyl ether, or monophenyl ether.
• the polyalkylene glycol include polyethylene glycol, ethylenoxide / propylene oxide copolymer, polypropylene glycol, and polytetramethylene glycol, and among them, polyethylene glycol is preferable. .
• the number average molecular weight of the polyether polyester block copolymer is preferably in the range of 30000 to 20000 because a higher anti-sticking effect can be obtained.
• the amount of the polyether polyester block copolymer adhering to the unstretched fiber must be not less than 0.03% by weight based on the unstretched fiber. Is not preferred because a sufficient anti-sticking effect cannot be obtained during stretching described later. On the other hand, even if the amount of adhesion is increased, the anti-sticking effect reaches a plateau and does not increase. Therefore, it is appropriate to set the amount to 0.5% by weight or less. In particular, the range of 0.05 to 0.3% by weight is appropriate.
• the method for attaching the polyether polyester block copolymer to the surface of the unstretched composite fiber is not particularly limited, and any conventionally known method may be used.
• additives such as an antistatic agent, a leveling agent, a fungicide, a fungicide, and an antibacterial agent may be contained.
• the second point in the manufacturing method is the stretching temperature.
• Stretching temperature is to be set to at least T 2 (glass transition point of the amorphous poly ester) is of course, polyalkylene terephthalates rate for the heat which is textiles forming component simultaneously
• the drawing temperature is lower than one of the glass transition points of the amorphous copolymerized polyester and the polyalkylene terephthalate.
• Et al is,.
• the stretching temperature T 2 + 3 0 ° to a temperature higher than C is important also NYCO. If the stretching temperature is exceeds the T 2 + 3 0 ° C can not be sufficiently prevented sticking of the amorphous polyester, or fusible fiber bundles occurs, Ri by the pushing click Li bumpers It is not preferable because crimp stability during crimping is deteriorated.
• the stretching temperature is within the above range, the stretching may be one-stage stretching or multi-stage stretching of two or more stages, but it is necessary to set the total stretching ratio to a cold stretching ratio of 0, 72 to 1.25 times. is there.
• the draw ratio is less than 0.72 times the cold draw ratio, the dimensional stability of the fiber structure is reduced, while when the draw ratio exceeds 1.25 times the cold draw ratio, the drawing is performed. Not only deteriorates the heat resistance, but also lowers the thermal adhesion. Not good.
• the cold drawing ratio of the undrawn fiber means that the undrawn conjugate fiber collected within 5 minutes from immediately after spinning is subjected to a chuck length of 10 in air of 25% relative humidity of 65%. It is obtained as the value obtained by dividing the chuck length interval (cm) at the point where the film is no longer stretched by stretching at a speed of 5 / sec as cm, by the initial chuck length (10 cm).
• the stretching is performed at a temperature T (which is the higher of the glass transition point of the amorphous copolymer polyester and the glass transition point of the polyalkylene terephthalate) to (T + 10).
• T which is the higher of the glass transition point of the amorphous copolymer polyester and the glass transition point of the polyalkylene terephthalate
• T + 10 glass transition point of the polyalkylene terephthalate
• ° C 0 cold draw ratio of the undrawn conjugate fibers at a temperature of. 7 to 1. 0 times, after stretching, (T + 1 0 ° C ) ⁇ (T 2 ( glass amorphous copolymerizable polyester (Transition point) at a temperature of + 30 ° C.) 1.03 to: Stretching L.25 times is effective in further improving dimensional stability and is a point of preventing sticking. But it is more effective.
• the drawn conjugate fiber is crimped by a conventionally known method under the conditions that the number of crimps is 3 to 40 pieces / 25 mm and the crimp rate is 3 to 40%, Cut to length. That is, when the crimping form is a mechanical crimp, for example, a press-type crimper may be used and the conditions of the press-in pressure and temperature may be appropriately controlled. On the other hand, in the case of three-dimensional crimping, the composite structure of the composite fiber may be selected or the cooling conditions during spinning may be appropriately selected.
• the polyester-based heat-adhesive conjugate short fibers of the present invention thus obtained have good dimensional stability and are suitable for use in fibrous structures such as nonwoven fabrics and hard cotton.
• Such a heat-adhesive conjugate staple fiber may be used alone as a fiber structure such as a non-woven fabric.
• As the main fiber a fiber structure such as a nonwoven fabric may be formed by blending with the heat-adhesive conjugate fiber.
• the measurement was performed using a differential scanning calorimeter DSC-17 manufactured by PerkinElmer Inc. at a heating rate of 20 ° C.
• the measurement was carried out at a temperature of 35 ° C using orthochlorophenol as a solvent.
• the measurement was performed by the method described in JIS L10155.7.5.1A method.
• the measurement was performed according to the method described in JIS L 0 15 7.4.1 C method.
• the weight of the residue extracted from the fiber with 30 methanol at a bath ratio of 1:20 for 10 minutes was measured, and the value obtained by dividing by the predetermined fiber weight was used.
• a hot air dryer (Satake Chemical Machinery Co., Ltd. hot air circulating constant temperature dryer) was formed by molding a card web consisting of 100% of heat-adhesive conjugate staple fibers of 100%. S 4) was allowed to stand for 2 minutes, and the area shrinkage was determined from the area A i of the card web after the heat treatment by the following equation. In addition, those having an area shrinkage of 20% or less were judged as acceptable.
• the melt was spun from a spinneret having a spinning hole number of 450 with a discharge amount of 65500 gZ.
• the undrawn core-sheath type conjugate fiber was obtained at 900 mZ.
• the maximum draw ratio of the undrawn fiber in the cold state (hereinafter, referred to as CDR) was 4.5 times.
• This undrawn composite fiber is bundled, made into a 110,000 dtex (100,000 denier) tow, and first drawn 3.5 times (0.78 times the CDR) in warm water at 72 ° C. After that, the film is further stretched 1.15 times in hot water at 80 ° C (total stretching ratio 4.0 times: 0.89 times of CDR) for spinning consisting of potassium lauryl phosphate.
• thermoadhesive conjugate short fiber having 10 pieces / 25 mm and a crimp rate of 15% was obtained.
• Example 2 The same conditions as in Example 1 were used, except that the heat-adhesive component, the fiber-forming component, the treatment agent, the draw ratio, and the draw temperature were changed.
• Single fiber fineness 4.4 dtex, fiber length 5 lmm, number of crimps 1 There were obtained 0 heat-adhesive conjugate short fibers having a Z of 25 mm and a crimp rate of 15%.
• Table 1 shows the fiber configurations of these Examples and Comparative Examples
• Table 2 shows the types of treating agents
• Table 3 shows the spinning and drawing conditions
• Table 4 shows the fiber evaluation results.
• T A Terephthalic acid I A: Isophthalic acid S A: Sepasic acid EG: Ethylene glycol D E G: Diethylene glycol
• T A Terephthalic acid
• I A Isophthalic acid
• PEG 3000 polyethylene glycol with an average molecular weight of 3000
• PE G4000 Polyethylene glycol with an average molecular weight of 4000
• M-PE G 3000 Polyethylene glycol monophenylene with an average molecular weight of 3000
• Phosphate 1 Lauryl phosphate calcium salt
• Phosphate 2 Partial phosphoric acid ester salt of peryl alcohol with an average ethylene oxide addition number of 5 mol
• the polyester-based heat-adhesive conjugate staple fiber of the present invention has good dimensional stability and is hardly deformed even when used in a high-temperature atmosphere, even though it can be formed into a fibrous structure at a relatively low temperature.
• the fiber structure of the present invention can be provided. Further, according to the production method of the present invention, the above-mentioned heat-adhesive conjugate short fibers can be produced extremely stably without sticking.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• General Chemical & Material Sciences (AREA)
• Multicomponent Fibers (AREA)
• Nonwoven Fabrics (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Developing Agents For Electrophotography (AREA)

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