WO2020166316A1 - 液晶ポリエステルマルチフィラメントおよびそれからなる高次加工製品 - Google Patents
液晶ポリエステルマルチフィラメントおよびそれからなる高次加工製品 Download PDFInfo
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- WO2020166316A1 WO2020166316A1 PCT/JP2020/002868 JP2020002868W WO2020166316A1 WO 2020166316 A1 WO2020166316 A1 WO 2020166316A1 JP 2020002868 W JP2020002868 W JP 2020002868W WO 2020166316 A1 WO2020166316 A1 WO 2020166316A1
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- liquid crystal
- crystal polyester
- polyester multifilament
- dtex
- temperature
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
- D07B1/025—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers
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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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
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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
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/60—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
- C08G63/605—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds the hydroxy and carboxylic groups being bound to aromatic rings
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
- C09K19/3804—Polymers with mesogenic groups in the main chain
- C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides
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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
- D01D5/08—Melt spinning methods
- D01D5/10—Melt spinning methods using organic materials
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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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
- D01F6/84—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyesters
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2009—Wires or filaments characterised by the materials used
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2039—Polyesters
- D07B2205/2042—High performance polyesters, e.g. Vectran
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
- D10B2331/042—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET] aromatic polyesters, e.g. vectran
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/20—Physical properties optical
Definitions
- the present invention relates to a liquid crystal polyester multifilament. More specifically, the present invention relates to a liquid crystal polyester multifilament that can be suitably used for higher-order processed products for general industrial materials such as ropes and slings.
- Liquid crystal polyester fibers are obtained by melt spinning by using a liquid crystal polyester polymer having a rigid molecular structure as a raw material, and in melt spinning, the molecular chains are highly oriented in the fiber axis direction and further subjected to heat treatment at high temperature for a long time. It is known that among the produced fibers, the highest strength and elastic modulus are exhibited. It is also known that the liquid crystal polyester fiber has an increased molecular weight and an increased melting point due to heat treatment, so that heat resistance and dimensional stability are improved.
- liquid crystal polyester fiber shows high strength in the fiber axis direction, it is weak against the force in the direction perpendicular to the fiber axis and easily fatigues against repeated bending, so it is suitable for high-order processed products such as ropes and slings. When used, the problem was that the strength was reduced when used repeatedly.
- Patent Document 1 In order to solve such a problem, in Patent Document 1, 0.03 to 5.0 mass% of inorganic fine particles having a mean particle diameter of 0.01 to 15 ⁇ m and containing silicic acid and magnesium having a Mohs hardness of 4 or less as main components are used. Polyarylate fibers that are attached to the fiber surface have been proposed. However, in the method described in Patent Document 1, the compression yield stress was about 6 mN/dtex, and the flex fatigue resistance was insufficient.
- the conventional technology has not obtained a liquid crystal polyester multifilament that exhibits high bending fatigue resistance when used as a high-order processed product.
- the present invention has the following configurations.
- a liquid crystal polyester multifilament in which the compressive yield stress of the fiber is 15 to 40 mN/dtex.
- liquid crystal polyester multifilament according to (1) or (2) which has an initial elastic modulus of 400 cN/dtex or more.
- liquid crystal polyester multifilament according to any of (1) to (4), which has a total fineness of 100 to 3000 dtex.
- the ratio of the structural unit (I) is 40 to 85 mol% with respect to the total of the structural units (I), (II) and (III), and the ratio of the structural unit (II) is the structural unit (II).
- (III) are 60 to 90 mol %, and the ratio of the structural unit (IV) is 40 to 95 mol% to the total of the structural units (IV) and (V) (1) to (6 7.)
- liquid crystal polyester multifilament according to any one of (1) to (5), wherein the liquid crystal polyester is composed of a p-hydroxybenzoic acid structural unit and a 6-hydroxy-2-naphthoic acid structural unit.
- the p-hydroxybenzoic acid structural unit is composed of 60 to 80 mol% of the whole, and the 6-hydroxy-2-naphthoic acid structural unit is composed of 20 to 40 mol% of the whole (1) to (5) or (8)
- liquid crystal polyester multifilament of the present invention can exhibit high bending fatigue resistance when used as a high-order processed product, it can be suitably used for general industrial material applications such as ropes, slings, and tension members.
- liquid crystal polyester multifilament of the present invention and the manufacturing method thereof will be described in detail below.
- the method for producing the liquid crystal polyester multifilament of the present invention is not limited at all as long as the liquid crystal polyester multifilament specified in the present invention can be obtained, but a preferable mode is described below.
- the liquid crystal polyester used in the present invention refers to a polyester that exhibits optical anisotropy (liquid crystallinity) when heated and melted. This can be verified by placing the sample on a hot stage, heating it up in a nitrogen atmosphere, and observing with a polarizing microscope for the presence of transmitted light.
- liquid crystal polyester used in the present invention examples include a polymer (a) of an aromatic oxycarboxylic acid, a polymer (b) of an aromatic dicarboxylic acid and an aromatic diol, a polymer (b) of an aliphatic diol, the above (a) and the above (b). (C)) and the like, and among them, a polymer composed only of aromatic compounds is preferable.
- the polymer composed of only aromatic compounds exhibits excellent strength and elastic modulus when formed into fibers.
- a conventionally known method can be used for polymerizing the liquid crystal polyester.
- aromatic dicarboxylic acid examples include terephthalic acid, isophthalic acid, diphenyldicarboxylic acid, naphthalene dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenoxyethane dicarboxylic acid, diphenylethane dicarboxylic acid, and the like, or alkyl, alkoxy, halogen substitution thereof.
- the body etc. are mentioned.
- examples of the aromatic diol include hydroquinone, resorcin, dihydroxybiphenyl, naphthalene diol, and the like, and alkyl, alkoxy, and halogen substitution products thereof, and the aliphatic diol includes ethylene glycol, propylene glycol, butane diol. , Neopentyl glycol and the like.
- the liquid crystal polyester used in the present invention can be copolymerized with other monomers in addition to the above-mentioned monomers in a range that does not impair the liquid crystallinity, and examples thereof include adipic acid, azelaic acid, sebacic acid and dodecanedioic acid.
- examples thereof include aliphatic dicarboxylic acids, alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, polyethers such as polyethylene glycol, polysiloxanes, aromatic iminocarboxylic acids, aromatic diimines, and aromatic hydroxyimines.
- a liquid crystal polyester comprising structural units (I), (II), (III), (IV) and (V) represented by the following chemical formula, or p-hydroxybenzoic acid and 6-hydroxy-2-naphthoene
- the structural unit refers to a unit capable of forming a repeating structure in the main chain of the polymer.
- liquid crystal polyester composed of (I) to (V) it is preferable to combine a component composed of a diol having high linearity, which is not bulky like the structural units (II) and (III).
- a component composed of a diol having high linearity which is not bulky like the structural units (II) and (III).
- the structural unit (I) is preferably 40 to 85 mol%, more preferably 65 to 80 mol%, and further preferably 68 to 75 mol% with respect to the total of the structural units (I), (II) and (III). .. With such a range, the crystallinity can be adjusted to an appropriate range, high strength and elastic modulus can be obtained, and the melting point can be melt-spun.
- the structural unit (II) is preferably 60 to 90 mol%, more preferably 60 to 80 mol%, and further preferably 65 to 75 mol% with respect to the total of the structural units (II) and (III). Within such a range, the crystallinity does not rise excessively and the interaction in the direction perpendicular to the fiber axis can be maintained, so that the wear resistance can be enhanced.
- the structural unit (IV) is preferably 40 to 95 mol%, more preferably 50 to 90 mol%, and further preferably 60 to 85 mol% with respect to the total of the structural units (IV) and (V). With such a range, the melting point of the polymer will be in an appropriate range, good spinning properties will be obtained at the spinning temperature set between the melting point of the polymer and the thermal decomposition temperature, and the single fiber fineness will be small, A relatively uniform fiber is obtained.
- the total of structural units (II) and (III) and the total of (IV) and (V) are preferably substantially equimolar.
- substantially equimolar means that dioxy units and dicarbonyl units constituting the main chain are present in equimolar amounts, and the terminal structural units may not be equimolar in some cases, for example, one of them may be unevenly distributed. Means that you may.
- each structural unit of the liquid crystal polyester used in the present invention is as follows.
- the preferable range of each structural unit is a range when the total of the structural units (I), (II), (III), (IV) and (V) is 100 mol %.
- the liquid crystal polyester fiber of the present invention is preferably obtained by adjusting the composition so as to satisfy the above conditions within this range.
- the structural unit of p-hydroxybenzoic acid is 60 to 80 mol% based on the whole
- the structural unit of 6-hydroxy-2-naphthoic acid is Is preferably 20 to 40 mol %, more preferably 65 to 75 mol% of p-hydroxybenzoic acid structural unit and 25 to 35 mol% of 6-hydroxy-2-naphthoic acid structural unit.
- the melting point of the polymer will be in an appropriate range, and good spinnability will be obtained.
- the polystyrene-equivalent weight average molecular weight (hereinafter, Mw) of the liquid crystal polyester used in the present invention is preferably 30,000 or more, more preferably 50,000 or more.
- Mw is preferably less than 250,000, more preferably less than 150,000.
- the Mw referred to in the present invention is a value obtained by the method described in the section of Examples.
- the melting point of the liquid crystal polyester used in the present invention is preferably in the range of 200 to 380° C., more preferably 250 to 350° C., and further preferably 290 to 340° C. from the viewpoint of melt spinning and heat resistance. Is.
- the melting point referred to in the present invention is a value obtained by the method described in the section of Examples.
- additive/combination means mixing polymers, or in one or more components in a composite spinning of two or more components, partially mixing other polymers, or using them entirely.
- examples of other polymers include polyesters, vinyl polymers such as polyolefins and polystyrenes, polycarbonates, polyamides, polyimides, polyphenylene sulfides, polyphenylene oxides, polysulfones, aromatic polyketones, aliphatic polyketones, semiaromatic polyesteramides, polyethers.
- Polymers such as ether ketone and fluororesin may be added, and polyphenylene sulfide, polyether ether ketone, nylon 6, nylon 66, nylon 46, nylon 6T, nylon 9T, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene na. Suitable examples include phthalate, polycyclohexanedimethanol terephthalate, polyester 99M and the like.
- the melting point is preferably within the melting point of the liquid crystal polyester ⁇ 30° C. so as not to impair the spinnability, and in order to improve the strength and elastic modulus of the obtained fiber. Is preferably 50% by weight or less, more preferably 5% by weight or less, and most preferably substantially no other polymer is added or used in combination.
- liquid crystal polyester used in the present invention within a range that does not impair the effects of the present invention, various metal oxides, kaolin, inorganic substances such as silica, colorants, matting agents, flame retardants, antioxidants, ultraviolet absorbers, It may contain a small amount of additives such as an infrared absorbing agent, a crystal nucleating agent, a fluorescent brightening agent, a terminal group sealing agent, and a compatibilizing agent.
- the compressive yield stress of the liquid crystal polyester multifilament of the present invention is essential to be 15 to 40 mN/dtex, preferably 20 to 40 mN/dtex, and more preferably 25 to 40 mN/dtex.
- the compressive yield stress is about 40 mN/dtex as the upper limit that can be achieved by the above-mentioned manufacturing method.
- the compressive yield stress refers to a value obtained by the method described in the section of Examples.
- the yarn softness index (X) of the liquid crystal polyester multifilament of the present invention is preferably 8.0 or less, more preferably 5.0 or less, and further preferably 4.0 or less.
- the yarn flexibility is high, the handleability in the higher-order process is improved, and the stress during repeated bending can be dispersed in the yarn, which is also advantageous in exhibiting high bending fatigue resistance.
- the yarn softness index (X) is 8.0 or less, the unwinding property at the time of unwinding the package is significantly improved, and the process passability at the time of high-order processing can be dramatically improved.
- the lower limit that can be reached in the present invention is about 0.1.
- the yarn softness index (X) of the multifilament refers to a value obtained by the method described in the Example section.
- the initial elastic modulus of the liquid crystal polyester multifilament of the present invention is preferably 400 cN/dtex or more, more preferably 500 cN/dtex or more, and further preferably 600 cN/dtex or more. Since the initial elastic modulus is 400 cN/dtex or more, the dimensional change upon receiving stress is small and it is suitable for industrial material applications.
- the upper limit of the initial elastic modulus is not particularly limited, but the upper limit that can be reached in the present invention is an initial elastic modulus of about 1,000 cN/dtex.
- the initial elastic modulus referred to in the present invention refers to a value obtained by the method described in the section of Examples.
- the single fiber fineness of the liquid crystal polyester multifilament of the present invention is preferably 1 to 30 dtex. Further, it is more preferably 1 to 20 dtex. By narrowing the single fiber fineness to 1 to 30 dtex, it is possible to evenly cool the inside of the single fiber after discharge, and the spinnability is stable, making it easy to obtain liquid crystal polyester multifilaments with good fluff quality, and also heat treatment Sometimes the surface area of the fiber exposed to the outside air increases, which is advantageous for high strength and elasticity.
- the yarn of the liquid crystal polyester multifilament of the present invention having a monofilament fineness of 1 to 30 dtex is flexible, it is excellent in high-step passability, and when used in a woven fabric or the like, the yarn filling rate is high. Higher density and improved storability can be achieved.
- the quotient obtained by dividing the total fineness by the number of single fibers is defined as the single fiber fineness (dtex).
- the number of single fibers (the number of filaments) of the liquid crystal polyester multifilament of the present invention is preferably 10 to 600, more preferably 10 to 400, and further preferably 10 to 300.
- the productivity of multifilaments can be improved, and the surface area of the fibers exposed to the outside air during heat treatment increases, which promotes the solid-state polymerization reaction, resulting in variations in strength and elastic modulus.
- a liquid crystal polyester multifilament having reduced and uniform physical properties can be obtained. It is also possible to separate or spun the sample obtained by spinning into a liquid crystal polyester multifilament having 10 to 600 single fibers.
- the number of single fibers refers to a value obtained by the method described in the section of Examples.
- the total fineness (T) of the liquid crystal polyester multifilament of the present invention is preferably 100 to 3000 dtex, more preferably 150 to 2500 dtex, and further preferably 200 to 2000 dtex. By setting it to 100 to 3000 dtex, it is suitable for industrial materials that have high process passability and extremely large amount of raw yarn used. It is also possible to separate or combine the sample obtained by spinning into a liquid crystal polyester multifilament having a total fineness of 100 to 3000 dtex.
- the total fineness refers to a value obtained by the method described in the section of Examples.
- the above-mentioned liquid crystal polyester is melt-spun.
- a general method can be used as a basic melt extrusion method, but it is preferable to use an extruder type extruder in order to eliminate the ordered structure generated during the polymerization.
- the extruded polymer is weighed by a well-known weighing device such as a gear pump through a pipe, passed through a filter for removing foreign substances, and then guided to a mouthpiece.
- the temperature from the polymer pipe to the spinneret is preferably higher than or equal to the melting point of the liquid crystal polyester and lower than or equal to the thermal decomposition temperature, more preferably higher than the melting point of the liquid crystal polyester +10°C or higher and 400°C or lower. More preferably, the melting point is +20° C. or higher and 370° C. or lower.
- the temperature from the polymer pipe to the die can be adjusted independently. In this case, the discharge is stabilized by making the temperature of the portion near the base higher than the temperature of the upstream side.
- a plurality of spinneret holes are bored in one spinneret for the purpose of reducing energy cost and improving productivity. It is preferable to stabilize the behavior.
- the hole diameter of the die hole is preferably 0.03 mm or more and 1.00 mm or less, more preferably 0.05 mm or more and 0.80 mm or less, and further preferably 0.08 mm or more and 0.60 mm or less. ..
- L/D defined by the quotient of the land length L divided by the hole diameter D is preferably 0.5 or more and 3.0 or less, preferably 0.8 or more, 2. 5 or less is more preferable, and 1.0 or more and 2.0 or less is further preferable.
- the number of holes in one die is preferably 10 or more and 1000 or less, more preferably 10 or more and 800 or less, still more preferably 10 or more and 600 or less.
- the introduction hole located immediately above the mouthpiece hole is preferably a straight hole having a diameter of 5 times or more the diameter of the mouthpiece hole from the viewpoint of not increasing the pressure loss. It is preferable to taper the connection part between the introduction hole and the die hole in order to suppress abnormal retention, but if the length of the taper part is less than twice the land length, pressure loss is not increased and the streamline is stabilized. It is preferable in that
- the heat-retaining region is preferably 400 mm from the spinneret surface, more preferably 300 mm, and further preferably 200 mm. It is possible to raise the ambient temperature in the heat retaining region by using a heating means, and the temperature range is preferably 100° C. or higher and 500° C. or lower, more preferably 200° C. or higher and 400° C. or lower.
- an inert gas, air, steam or the like can be used, but it is preferable to use a parallel or annular air flow from the viewpoint of reducing the environmental load.
- the take-up speed is preferably 50 m/min or more, more preferably 300 m/min or more, and further preferably 500 m/min or more for improving productivity. Since the liquid crystal polyester used in the present invention has a suitable spinnability at the spinning temperature, the take-up speed can be increased.
- the upper limit is not particularly limited, but in the liquid crystal polyester used in the present invention, it is about 3,000 m/min from the viewpoint of spinnability.
- the spinning draft defined by the quotient obtained by dividing the take-up speed by the discharge linear velocity is preferably 1 or more and 500 or less, more preferably 5 or more and 200 or less, and further preferably 12 or more and 100 or less. Since the liquid crystal polyester used in the present invention has a suitable spinnability, the spinning draft can be increased, which is advantageous for improving productivity.
- the discharge linear velocity (m/min) used in the calculation of the spinning draft is defined by the quotient obtained by dividing the discharge amount per single hole (m 3 /min) by the single hole cross-sectional area (m 2 ). This is a value, and since the take-up speed (m/min) is divided by the discharge linear velocity, the spinning draft becomes a dimensionless number.
- the polymer discharge amount per spin pack is preferably set to 10 to 2,000 g/min, and 20 to 1,000 g/min in order to obtain the above spinning draft. It is more preferably set, and further preferably set to 30 to 500 g/min. By spinning at a high discharge of 10 to 2,000 g/min, the productivity of liquid crystal polyester is improved.
- An ordinary winding machine may be used for winding, and cheese, bread, corn or the like may be formed into a package, but it is preferable to use a cheese winding package in which the amount of winding can be set high.
- a spinning oil agent to the discharge yarn with an oiling roller or the like, and after taking them with a roller or the like, wind them with a winder without stretching. Is.
- the winding property is improved, and a package in which winding is not collapsed can be obtained.
- liquid crystal polyester multifilaments it is preferable to carry out solid-state polymerization after melt spinning into filaments.
- a package having a winding density of 0.30 g/cm 3 or more may be formed on the bobbin and solid-state polymerized.
- the winding density is calculated by Wf/Vf (g/cm 3 ) from the package occupying volume Vf (cm 3 ) and the fiber weight Wf (g) obtained from the package outer dimension and the size of the bobbin serving as the core material. Is a value. If the winding density is excessively small, the tension in the package will be insufficient, so that the contact area between the fibers will be increased and the fusion will be increased.
- the winding density is preferably 0.30 g/cm 3 or more. more preferably to .40g / cm 3 or more and more preferably be 0.50 g / cm 3 or more.
- the upper limit is not particularly limited, but if the winding density is excessively high, the adhesion between the fibers in the inner layer of the package increases and the fusion at the contact point increases, so it is preferably 1.50 g/cm 3 or less. ..
- the winding density is more preferably 0.30 to 1.00 g/cm 3 from the viewpoint of reducing fusion and preventing winding collapse.
- a package with such a winding density has good processability and simplifies the process.
- To adjust the package shape and control the winding density do not use the contact rolls that are usually used, but wind the package surface in a non-contact state, or directly melt the spun yarn without using a speed control roll. Winding with a controlled winder is also effective.
- the winding speed is preferably 3000 m/min or less, particularly 2000 m/min or less. From the viewpoint of productivity, the lower limit is preferably 50 m/min or more.
- the bobbin used to form the package may be of any cylindrical shape, and when the package is wound up, the bobbin is attached to a winder to rotate the fiber to form a package.
- the package can be processed integrally with the bobbin, but it is also possible to remove only the bobbin from the package for processing.
- the bobbin needs to withstand the solid-state polymerization temperature, and is preferably made of metal such as aluminum, brass, iron or stainless steel. Further, in this case, it is preferable that the bobbin has a large number of holes because solid-phase polymerization can be efficiently performed.
- the bobbin when the bobbin is taken out from the package for processing, it is preferable to attach an outer cover to the outer surface of the bobbin.
- a cushion material is wound around the outer surface of the bobbin, and the liquid crystal polyester melt-spun filament is wound around the cushion material.
- the material of the cushion material is preferably a felt made of organic fibers such as aramid fibers or metal fibers, and the thickness thereof is preferably 0.1 mm or more and 20 mm or less.
- the above-mentioned outer skin may be replaced by the cushion material.
- the fiber weight of the package may be any weight as long as the winding density is within the range of the present invention, but in view of productivity, 0.01 kg or more and 11 kg or less is a preferable range.
- the yarn length is preferably in the range of 10,000 to 2,000,000 m.
- a preferred embodiment is to attach an oil agent to the surface of the filament in order to prevent fusion during solid phase polymerization.
- These components may be attached between melt spinning and winding, but in order to improve the adhesion efficiency, they are attached at the time of rewinding, or a small amount is attached at the time of melt spinning and further added at the time of rewinding. Preferably.
- an anti-fusion agent having high heat resistance that maintains a liquid state even after solid phase polymerization treatment.
- an anti-fusion agent having high heat resistance that maintains a liquid state even after solid phase polymerization treatment.
- R1 is a hydrocarbon having a benzene skeleton
- R2 is a hydrocarbon having 2 or more carbon atoms
- M is a hydrogen atom, an alkali metal, an alkaline earth metal or ammonium
- m is 0 to 30 in average.
- N are preferably 1 or more and 2 or less on average.
- the amount of the anti-fusing agent attached to the fibers is preferably large in order to suppress the fusion, and is preferably 0.5% by weight or more, and more preferably 1.0% by weight or more, based on 100% by weight of the entire fibers. preferable. On the other hand, if the amount is too large, the fibers deteriorate stickiness and handleability in the subsequent steps, so 10.0 wt% or less is preferable, 8.0 wt% or less is more preferable, and 6.0 wt% or less is Particularly preferred.
- the amount of the oil agent (anti-fusing agent) attached to the fibers refers to the value obtained by the method described in the section of Examples.
- Guide oiling may be used as the oil application method, but metal or ceramic kiss rolls (oiling rolls) are preferred for uniform application to the fibers.
- Solid-state polymerization can be carried out in an atmosphere of an inert gas such as nitrogen, in an atmosphere of an oxygen-containing active gas such as air, or under reduced pressure, but simplification of equipment and prevention of oxidation of fibers or deposits Therefore, it is preferably performed in a nitrogen atmosphere.
- the atmosphere for solid-state polymerization is preferably a low-humidity material having a dew point of ⁇ 40° C. or lower.
- Solid-phase polymerization temperature, to the liquid crystal polyester filament to be subjected to solid phase polymerization mp (T m1) is preferably the highest temperature is the liquid crystal polyester filament the melting point (T m1) -80 °C or higher.
- T m1 melting point
- T m1 melting point
- ⁇ It is preferable to rewind the package after solid-state polymerization to increase the winding density in order to improve the transportation efficiency.
- the solid-state polymerization package is used. It is preferable that the yarn is unwound by so-called wefting, which unwinds the yarn in the direction perpendicular to the axis of rotation (the fiber winding direction) while rotating. Further, it is preferable that the solid-state polymerization package is rotated not by free rotation but by positive drive in order to reduce the yarn separation tension from the package and further suppress fibrillation.
- the present invention is a liquid crystal polyester multifilament characterized in that the compressive yield stress of the fiber is 15 to 40 mN/dtex.
- the compressive yield stress of the fiber refers to a value obtained by the method described in the section of Examples.
- the present inventors have found that by controlling the compressive yield stress, the bending fatigue resistance is significantly improved as compared with the prior art. I found it.
- a clear mechanism for improving flex fatigue resistance is not clear, in the flex fatigue test, the fiber is repeatedly bent, but it is necessary to prevent the fiber structure from breaking inside the fiber to improve flex fatigue resistance. Is considered to be important.
- the method for obtaining a liquid crystal polyester multifilament having a compressive yield stress of 15 to 40 mN/dtex is not limited in any way, but for example, there is a method of appropriately controlling the temperature rising time of solid phase polymerization and the solid phase polymerization time.
- the present inventors improve the compressive yield stress of the liquid crystal polyester fiber by dividing the temperature rise until reaching the maximum temperature during solid phase polymerization into two stages and appropriately controlling the time required for each temperature rise. I found that Although the clear mechanism of improving the compressive yield stress is not clear, the initial stage of solid-state polymerization raises the temperature to some extent to promote the crystallization of the fiber surface, while the second stage gradually raises the temperature. It is considered that the structure becomes dense and the compressive yield stress is improved.
- the first step is a temperature rise starting from room temperature to a melting point of ⁇ 160 to a melting point of ⁇ 120° C.
- a temperature raising time is preferably 0.1 to 1.0 hour.
- the second stage is a temperature rise from the first stage temperature rise temperature to the melting point ⁇ 50 to the melting point +10° C., and the temperature rise time is preferably 20 to 80 hours.
- the yarn flexibility is high, and the yarn flexibility index X is preferably 8.0 or less. It is considered that the softer the yarn is, the less bending stress is generated during bending, and the destruction of the fiber structure when repeatedly bent in a certain direction can be prevented.
- a method of improving the yarn flexibility for example, there is a method of bending the fiber surface in a plurality of directions when the filament is unwound from the package in which solid phase polymerization is completed.
- direction refers to a direction indicated by a range of 0 to 360° in the plane perpendicular to the longitudinal direction of the multifilament after unwinding, and is defined by the direction of initial bending and the direction of subsequent bending.
- the angle is defined as the azimuth angle (thus the azimuth angle in the first bent direction is 0°).
- the bending direction is preferably 4 or more, and more preferably 8 or more.
- the upper limit is not particularly limited, but it is preferably 36 directions or less from the viewpoint that workability at the time of thread setting is deteriorated.
- 4 to 18 directions are preferable ranges.
- the azimuth angle when bending in multiple directions is preferably an angle equally divided by the number of times 360° is bent in order to make each filament in the multifilament uniformly flexible.
- the azimuth angle when bent in 8 directions is an angle when 0 to 360° is divided into 8 equal parts in a plane perpendicular to the longitudinal direction of the multifilament after releasing, 0°, 45°, It becomes 90°, 135°, 180°, 225°, 270°, 315°.
- the azimuth may be bent in any order other than 0° (first bending).
- the distance between the guides (the distance from one bend to the next bend) is to prevent the yarn blurring after the bend is given, and to prevent the yarn from coming off the guide and the yarn getting caught in the guide.
- the length is preferably 50 cm or more, and 100 cm or less in order to make the equipment compact.
- a thread guide such as a bar guide, a loop guide, an eyelet guide, a slit guide, a hook guide, a snail guide, a roller guide, or a bearing roller guide to reduce the abrasion of multifilaments. Therefore, it is more preferable to use a roller guide or a bearing roller guide.
- the bending angle after passing through the guide is preferably 30° or more, more preferably 60° or more in order to effectively impart bending and increase the flexibility of the yarn.
- the upper limit is not particularly limited, but it is preferably 90° or less from the viewpoint of threading workability.
- the bending angle here means an angle formed by an extension line extending in the longitudinal direction of the running yarn before passing the guide and a longitudinal direction of the running yarn after bending through the guide.
- liquid crystal polyester multi-filament package After bending, form the liquid crystal polyester multi-filament package again.
- a package in the form of a pan, a drum, a cone or the like can be used, but from the viewpoint of productivity, a drum winding package that can secure a large winding amount is preferable.
- liquid crystal polyester multifilament in the present invention in order to enhance the process passability in the case of a high-order processed product, it is better to impart a focusing property to the multifilament, and various finishing oil agents are added depending on the purpose. Is the preferred embodiment.
- the strength of the liquid crystal polyester multifilament of the present invention after solid state polymerization is preferably 15.0 cN/dtex or more, more preferably 22.5 cN/dtex or more. Since the strength is 15.0 cN/dtex or more, it is suitable for industrial material applications where high strength and light weight are required.
- the upper limit of the strength is not particularly limited, but the upper limit that can be reached in the present invention is about 30.0 cN/dtex.
- the strength referred to in the present invention refers to a value obtained by the method described in the section of Examples.
- the elongation after solid phase polymerization of the liquid crystal polyester multifilament of the present invention is preferably 5.0% or less, more preferably 4.5% or less, still more preferably 4.0% or less. Since the elongation is 5.0% or less, it is difficult to elongate when stress is applied from the outside, and the dimensional change of the product is small and it can be suitably used.
- the lower limit of the elongation is not particularly limited, but the lower limit that can be achieved by the present invention is about 1.0%.
- the elongation referred to in the present invention refers to a value obtained by the method described in the section of Examples.
- the liquid crystal polyester multifilament of the present invention thus obtained has a compressive yield stress of 15 to 40 mN/dtex, and the liquid crystal polyester multifilament having such characteristics is higher than that of the prior art when used as a high-order processed product. And significantly higher flex fatigue resistance can be achieved.
- the liquid crystal polyester multifilament having excellent compressive yield stress, high strength, high elasticity, heat resistance, dimensional stability, chemical resistance, and low hygroscopicity can be suitably used for general industrial material applications. Examples of general industrial material applications include ropes, slings, cables, fishing nets, nets, meshes, fabrics, cloths, sheets, belts, tension members, civil engineering/construction materials, sports materials, protective materials, rubber reinforcement materials, and various other materials.
- the liquid crystal polyester multifilament excellent in the compressive yield stress of the present invention can be preferably used particularly for applications such as ropes, slings, cables, and tension members, which are repeatedly bent as a high-order processed product.
- Oil agent concentration When the weight of the solution in which the oil agent is dispersed is W0 and the weight of the oil agent is W1, the product obtained by multiplying the quotient obtained by dividing W1 by W0 by 100 is taken as the oil agent concentration (% by weight).
- Number of Single Fibers The number of single fibers was calculated by the method of JIS L 1013 (2010) 8.4.
- Single Fiber Fineness A value obtained by dividing the total fineness by the number of single fibers was defined as a single fiber fineness (dtex).
- test pieces obtained are symmetrically placed on a support stand installed at intervals of 5 mm, and a force is applied to the center of the fulcrum of the test piece with an indenter. It was With the support base fixed, the indenter was moved down at a constant speed of 20 mm/min, and the maximum load when a force was applied to the test piece was measured to obtain the bending resistance value (A) (cN). The support base and the indenter had a diameter of 1.0 mm. The average value of 5 times of execution was used.
- ⁇ Reference example 1> In a 5 L reaction vessel equipped with a stirring blade and a distillation tube, 870 g (6.30 mol) of p-hydroxybenzoic acid, 327 g (1.890 mol) of 4,4′-dihydroxybiphenyl, 89 g of hydroquinone (0.810 mol). ), 292 g (1.755 mol) of terephthalic acid, 157 g (0.945 mol) of isophthalic acid and 1460 g of acetic anhydride (1.10 equivalent of total phenolic hydroxyl groups) were charged, and the mixture was stirred at 25° C. under a nitrogen gas atmosphere from 25° C. After raising the temperature to 145° C. in 30 minutes, the mixture was reacted at a temperature of 145° C. for 2 hours. Then, the temperature was raised to 335° C. in 4 hours.
- the polymerization temperature was maintained at 335° C., the pressure was reduced to 133 Pa in 1.5 hours, the reaction was continued for another 40 minutes, and polycondensation was completed when the torque reached 28 kgcm.
- the inside of the reaction vessel was pressurized to 0.1 MPa, the polymer was discharged into a strand through a die having one circular discharge port having a diameter of 10 mm, and pelletized by a cutter.
- This liquid crystalline polyester comprises 54 mol% of p-hydroxybenzoic acid units, 16 mol% of 4,4′-dihydroxybiphenyl units, 8 mol% of isophthalic acid units, 15 mol% of terephthalic acid units, and 7 mol% of hydroquinone units.
- ⁇ Reference example 2> In a 5 L reaction vessel equipped with a stirring blade and a distillation tube, 907 g (6.57 mol) of p-hydroxybenzoic acid, 457 g (2.42 mol) of 6-hydroxy-2-naphthoic acid and 946 g of acetic anhydride (phenolic The total amount of hydroxyl groups (1.03 equivalents) was charged, the temperature was raised from 25° C. to 145° C. in 30 minutes while stirring in a nitrogen gas atmosphere, and then the reaction was performed at a temperature of 145° C. for 2 hours. Then, the temperature was raised to 325° C. in 4 hours.
- the polymerization temperature was maintained at 325° C., the pressure was reduced to 133 Pa in 1.5 hours, the reaction was continued for 20 minutes, and polycondensation was completed when the torque reached 15 kgcm.
- the inside of the reaction vessel was pressurized to 0.1 MPa, the polymer was discharged into a strand through a die having one circular discharge port having a diameter of 10 mm, and pelletized by a cutter.
- This liquid crystalline polyester was composed of 73 mol% of p-hydroxybenzoic acid units and 27 mol% of 6-hydroxy-2-naphthoic acid units, and had a melting point (T m2 ) of 285° C., using a Koka type flow tester.
- the melt viscosity measured at a temperature of 293° C. and a shear rate of 1,000/sec was 32 Pa ⁇ sec.
- Mw was 125,000.
- Example 1 Using the liquid crystalline polyester of Reference Example 1, vacuum drying was performed at 120° C. for 12 hours to remove water and oligomers. The water content of the liquid crystal polyester at this time was 50 ppm. The dried liquid crystal polyester was melt-extruded with a single-screw extruder (heater temperature of 290 to 340° C.), and the polymer was supplied to the spinning pack while being weighed with a gear pump. The spinning temperature from the extruder outlet to the spinning pack at this time was 335°C.
- Liquid crystal polyester multifilaments that were cooled and solidified at room temperature immediately after discharge were attached to an aqueous solution containing 2 mass% of a phosphoric acid ester compound A (anti-fusing agent) at room temperature using an oiling roller, while 300 filaments were 600 m each. /Min with a Nelson roller. The spinning draft at this time was 29.3. In addition, the amount of attached oil was 1.5% by weight.
- the multifilament collected by a Nelson roller was wound into a cheese shape using a feather traverse type winder as it was through a dancer arm.
- the phosphoric acid ester compound A is a phosphoric acid ester compound represented by the above chemical formula 2, R1 is an aryl group, R2 is a linear saturated hydrocarbon having 2 to 4 carbon atoms, M is potassium, m Is a phosphoric acid ester compound having an average value of 8 and an average value of n of 1.
- a fiber was unwound from the spinning package in the longitudinal direction (perpendicular to the fiber wrapping direction), and the speed was kept constant at 400 m/min with a winder (SSP-WV8P type precision winder manufactured by Kozu Corporation). I rewound.
- a bobbin made of stainless steel was used as the core material for rewinding, the tension at rewinding was 0.005 cN/dtex, the winding density was 0.50 g/cm 3, and the winding amount was 4.0 kg.
- the package shape is a taper end winding with a taper angle of 65°.
- the solid-state polymerization package thus obtained was attached to a delivery device that can be rotated by an inverter motor, and the fibers were delivered at 200 m/min in the lateral direction (fiber circulation direction) while unwinding, and a bearing roller guide manufactured by Yuasa Yidodo Kogyo ( A312030) was placed at a position where the yarn length was 50 cm, and was bent in 18 directions (18 equal divisions) at a bending angle of 60° and then wound into a product package by a winder.
- the fiber physical properties are as shown in Table 1.
- Examples 2 to 7 A liquid crystal polyester multifilament was obtained in the same manner as in Example 1 except that the temperature rising time, the holding time and the temperature during the solid phase polymerization were as shown in Table 1.
- Example 8 to 11 A liquid crystal polyester multifilament was obtained in the same manner as in Example 1 except that the total fineness and the number of filaments were changed as shown in Table 1 by changing the number of holes in the die and the discharge amount.
- Example 13 A liquid crystal polyester multifilament was obtained in the same manner as in Example 1 except that the solid phase polymerization package was not bent at the time of unwinding.
- Example 14 and 15 A liquid crystal polyester multifilament was obtained in the same manner as in Example 1 except that the liquid crystal polyester of Reference Example 2 was used and the temperature rising time, the holding time and the temperature during solid phase polymerization were set as shown in Table 1.
- Somasif registered trademark
- Example 1 A liquid crystal polyester multifilament was obtained in the same manner as in Example 1 except that the heat treatment was performed at a melting point of ⁇ 0° C. for 12 hours, and the solid-state polymerization package was not bent when unwound.
- Example 6 A liquid crystal polyester multifilament was obtained in the same manner as in Example 1 except that the liquid crystal polyester of Reference Example 2 was used, and the temperature rising time, the holding time and the temperature during solid phase polymerization were as shown in Table 2.
- the liquid crystal polyester multifilament of the present invention has a compressive yield stress of 15 to 40 mN/dtex, it can maintain high strength even when repeatedly bent when it is used as a high-order processed product. Since such a liquid crystal polyester multifilament can exhibit significantly higher flexural fatigue resistance as compared with the prior art, it can be suitably used for general industrial material applications such as ropes, slings and tension members.
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Abstract
Description
構造単位(II) 12~18mol%
構造単位(III) 3~10mol%
構造単位(IV) 5~20mol%
構造単位(V) 2~15mol%
p-ヒドロキシ安息香酸および6-ヒドロキシ-2-ナフトエ酸からなる液晶ポリエステルを用いる場合、p-ヒドロキシ安息香酸の構造単位は全体に対し60~80mol%、6-ヒドロキシ-2-ナフトエ酸の構造単位は20~40mol%とするのが好ましく、p-ヒドロキシ安息香酸構造単位を65~75mol%、6-ヒドロキシ-2-ナフトエ酸構造単位を25~35mol%とするのがさらに好ましい。このような範囲とすることでポリマーの融点が適切な範囲となり、良好な製糸性を有するようになる。
液晶ポリエステルマルチフィラメントの溶融紡糸では、オイリングローラー等で吐出糸条に紡糸油剤を付与することでマルチフィラメントを集束させ、ローラー等で引き取った後、延伸することなく、ワインダーで巻き取ることが一般的である。このように、マルチフィラメント紡出糸条を集束させることで、巻き取り性が向上し、巻崩れのないパッケージが得られる。
示差走査熱量計(TA Instruments社製DSC2920)で行う示差熱量測定において、50℃から20℃/分の昇温条件測定した際に観測される吸熱ピーク温度(Tm1)の観測後、およそTm1+20℃の温度で5分間保持した後、20℃/分の降温速度で50℃まで冷却し、再度20℃/分の昇温条件で測定した際に観測される吸熱ピーク温度(Tm2)を融点とした。同様の操作を2回行い、2回の平均値を液晶ポリエステルの融点Tm2(℃)とした。
溶媒としてペンタフルオロフェノール/クロロホルム=35/65(重量比)の混合溶媒を用い、120℃で20分攪拌しながら、液晶ポリエステルを混合溶媒に溶解させる。このとき、液晶ポリエステルの濃度が0.04重量%となるように調製し、GPC測定用試料とする。これをWaters社製GPC測定装置を用いて測定し、ポリスチレン換算によりMwを求めた。同様の操作を2回行い、2回の平均値を重量平均分子量(Mw)とした。
ShodexK-806M(2)
ShodexK-802(1)
検出器:示差屈折率検出器RI(2414型)
温度 :23±2℃
流速 :0.8mL/分
注入量:0.200mL。
平沼産業社製カールフィッシャー水分計(AQ-2100)を用いた電量滴定法で測定した。施行回数3回の平均値を用いた。
油剤を分散させた溶液の重量をW0、油剤の重量をW1とした場合に、W1をW0で除した商に100を乗じた積を油剤濃度(重量%)とした。
検尺機にて繊維を100mカセ取りして重量を測定した後、カセを100mlの水に浸して超音波洗浄機を用いて1時間洗浄を行った。超音波洗浄後のカセを60℃の温度で1時間乾燥させて重量を測定し、洗浄前重量と洗浄後重量の差を洗浄前重量で除した商に100を乗じた積を油剤付着量(重量%)とした。
JIS L 1013(2010)8.3.1 A法により、所定荷重0.045cN/dtexで正量繊度を測定して総繊度(dtex)とした。
JIS L 1013(2010)8.4の方法で算出した。
総繊度を単繊維数で除した値を単繊維繊度(dtex)とした。
JIS L 1013(2010)8.5.1標準時試験に示される定速伸長条件で測定した。試料をオリエンテック社製“テンシロン”(TENSILON)RTM-100を用い、掴み間隔(測定試長)は250mm、引張速度は50mm/分で行った。強度・伸度は破断時の応力および伸びとし、初期弾性率は引張試験における応力と伸びのグラフにおいて、最小二乗法により伸度0.45%から0.55%の範囲の測定点の近似直線を描いたときの直線の傾きとした。
JIS K7171(2016)に示される定速たわみ条件を参考に測定した。すなわち、まずパッケージに巻き取ったフィラメントの曲げ、および撚りグセを解くため、フィラメントを長さ1000mmに切り出して、その一端に、金属製フックを結びつけ、他端に破断荷重の300gの錘を結びつけ、温度25℃、相対湿度40%に調節された環境下、空中に24時間吊してマルチフィラメントを鉛直にせしめ、測定試料を得た。得られた測定試料をさらに40mmの長さで切り出し、試料片とした。東洋ボールドウィン社製“テンシロン”(TENSILON) UTM-4-100を用い、5mmの間隔で設置した支持台に得られた試験片を対称的に乗せ、試験片の支点間中央に圧子で力を加えた。支持台は固定した状態で、圧子を20mm/分の一定速度で下降させ、試験片に力を付与した際の最大荷重を測定し、曲げ抵抗値(A)(cN)とした。支持台、および圧子の直径は1.0mmとした。施行回数5回の平均値を用いた。
マルチフィラメントの糸条柔軟指数(X)は、マルチフィラメントの曲げ抵抗値(A)(cN)とマルチフィラメントの総繊度T(dtex)を用いて次式により算出した。
糸条柔軟指数(X)=(A/T)×103。
単繊維1本をガラス製のステージに静置し、その直径方向に圧子を用いて圧縮負荷を徐々に加え、そのときの荷重-変位曲線を取得する。得られた荷重-変位線図における初期領域および降伏後領域の各域で得られたデータを直線近似し、両直線の交点となる荷重を降伏荷重とした。得られた降伏荷重を単繊維の繊度で除した値を圧縮降伏応力とした。
使用圧子:ダイヤモンド製平面圧子(φ=500μm)
負荷速度:41.482mN/s(負荷速度一定方式)
測定温度:室温
測定雰囲気:大気中。
撚糸機を用いて、マルチフィラメント2本を合糸しながら100T/mの撚り数で片撚りを加え合撚糸を作製した。その後、図1に示す通り、この合撚糸1をロール中心間の実距離が14mmである、自由に回転する外径が10mmの一対の鉄製(材質:SS400)鏡面ロール2にロール間の糸が鉛直になるようにS字状に掛けた後、0.5g/dtexの荷重3をかけ、金属ロール2をロール中心間距離が一定になるように8000回往復上下運動(往復距離:100mm)させて屈曲疲労させた。屈曲疲労前の合撚糸強力および屈曲疲労後の合撚糸強力を測定し、次式により強力保持率を算出した。
屈曲疲労後強力保持率(%)=屈曲疲労後の合撚糸強力/屈曲疲労前の合撚糸強力×100。
耐屈曲疲労性:
5:90%以上
4:80%以上90%未満
3:70%以上80%未満
2:60%以上70%未満
1:60%未満。
攪拌翼と留出管を備えた5Lの反応容器に、p-ヒドロキシ安息香酸870g(6.30モル)、4,4’-ジヒドロキシビフェニル327g(1.890モル)、ハイドロキノン89g(0.810モル)、テレフタル酸292g(1.755モル)、イソフタル酸157g(0.945モル)および無水酢酸1460g(フェノール性水酸基合計の1.10当量)を仕込み、窒素ガス雰囲気下で攪拌しながら25℃から145℃の温度まで30分で昇温した後、145℃の温度で2時間反応させた。その後、335℃の温度まで4時間で昇温した。
攪拌翼と留出管を備えた5Lの反応容器に、p-ヒドロキシ安息香酸907g(6.57モル)、6-ヒドロキシ-2-ナフトエ酸457g(2.42モル)および無水酢酸946g(フェノール性水酸基合計の1.03当量)を仕込み、窒素ガス雰囲気下で攪拌しながら25℃から145℃の温度まで30分で昇温した後、145℃の温度で2時間反応させた。その後、325℃の温度まで4時間で昇温した。
参考例1の液晶ポリエステルを用い、120℃で12時間真空乾燥を行い、水分・オリゴマーを除去した。このときの液晶ポリエステルの水分率は50ppmであった。この乾燥した液晶ポリエステルを、単軸のエクストルーダーにて(ヒーター温度290~340℃)溶融押出しし、ギアーポンプで計量しつつ紡糸パックにポリマーを供給した。このときのエクストルーダー出口から紡糸パックまでの紡糸温度は335℃とした。紡糸パックでは濾過精度が15μmの金属不織布フィルターを用いてポリマーを濾過し、孔径0.13mm、ランド長0.26mmの孔を300個有する口金より吐出量100g/分(単孔あたり0.33g/分)でポリマーを吐出した。
固相重合時の昇温時間や保持時間、温度を表1の通りとしたこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
口金の孔数および吐出量を変更することで総繊度、フィラメント数を表1の通りとしたこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
融着防止剤をポリジメチルシロキサン(東レ・ダウコーニング社製「SH200-350cSt」)を水に1質量%分散させた溶液に変更したこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
固相重合パッケージの解舒時に屈曲させないこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
参考例2の液晶ポリエステルを用いたこと、固相重合時の昇温時間や保持時間、温度を表1の通りとしたこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
固相重合時の昇温時間や保持時間、温度を表2の通りとしたこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
無機微粒子として平均粒径5~7μmのケイ酸およびマグネシウムを主成分とする合成無機微粒子(コープケミカル株式会社製「“ソマシフ”(登録商標)ME-100」、モース硬度=2.8)をポリエチレングリコールラウリレートを主成分とする紡糸油剤に濃度6重量%で分散させたものを紡糸原糸に付着させ、付着時に上記「ソマシフME-100」は膨潤してへき開し、平均粒径は0.02~7μmとなり、次にこの紡糸原糸を蒸留水中で3 時間超音波洗浄して微粒子を落とし、微粒子付着量を0.6重量%としたこと、固相重合時に融点-20℃で2時間、融点-0℃で12時間熱処理したこと、固相重合パッケージの解舒時に屈曲させないこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
参考例2の液晶ポリエステルを用いたこと、固相重合時の昇温時間や保持時間、温度を表2の通りとしたこと以外は実施例1と同様の方法で液晶ポリエステルマルチフィラメントを得た。
2 金属ロール
3 荷重
4 ロール中心間距離
Claims (11)
- 繊維の圧縮降伏応力が15~40mN/dtexである液晶ポリエステルマルチフィラメント。
- 糸条柔軟指数が8.0以下である請求項1に記載の液晶ポリエステルマルチフィラメント。
- 初期弾性率が400cN/dtex以上である請求項1または2に記載の液晶ポリエステルマルチフィラメント。
- フィラメント数が10~600本である請求項1~3に記載の液晶ポリエステルマルチフィラメント。
- 総繊度が100~3000dtexである請求項1~4に記載の液晶ポリエステルマルチフィラメント。
- 構造単位(I)の割合が構造単位(I)、(II)および(III)の合計に対して40~85mol%であり、構造単位(II)の割合が構造単位(II)および(III)の合計に対して60~90mol%であり、構造単位(IV)の割合が構造単位(IV)および(V)の合計に対して40~95mol%である、請求項1~6に記載の液晶ポリエステルマルチフィラメント。
- 液晶ポリエステルが、p-ヒドロキシ安息香酸構造単位および6-ヒドロキシ-2-ナフトエ酸構造単位から構成される請求項1~5のいずれかに記載の液晶ポリエステルマルチフィラメント。
- p-ヒドロキシ安息香酸構造単位が全体の60~80mol%、6-ヒドロキシ-2-ナフトエ酸構造単位が全体の20~40mol%で構成される請求項1~5または8のいずれかに記載の液晶ポリエステルマルチフィラメント。
- 請求項1~9のいずれかに記載の液晶ポリエステルマルチフィラメントからなる高次加工製品。
- 請求項1~9のいずれかに記載の液晶ポリエステルマルチフィラメントからなるロープ、スリング、テンションメンバーまたはケーブル。
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EP20755543.4A EP3926081A4 (en) | 2019-02-12 | 2020-01-28 | LIQUID CRYSTAL POLYESTER MULTIFILAMENT, AND HIGH-PROCESS PRODUCT COMPRISING THEM |
BR112021013951-6A BR112021013951A2 (pt) | 2019-02-12 | 2020-01-28 | Multifilamento de poliéster líquido-cristalino e produto processado de alto nível compreendendo o mesmo |
US17/425,428 US20220098760A1 (en) | 2019-02-12 | 2020-01-28 | Liquid-crystal polyester multifilament, and high-level processed product comprising same |
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