WO2023058563A1 - 液晶ポリエステル繊維およびその製造方法 - Google Patents
液晶ポリエステル繊維およびその製造方法 Download PDFInfo
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- WO2023058563A1 WO2023058563A1 PCT/JP2022/036593 JP2022036593W WO2023058563A1 WO 2023058563 A1 WO2023058563 A1 WO 2023058563A1 JP 2022036593 W JP2022036593 W JP 2022036593W WO 2023058563 A1 WO2023058563 A1 WO 2023058563A1
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- liquid crystalline
- crystalline polyester
- polyester fiber
- fiber
- liquid crystal
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- 229920000728 polyester Polymers 0.000 title claims abstract description 220
- 239000000835 fiber Substances 0.000 title claims abstract description 210
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 34
- 238000002844 melting Methods 0.000 claims abstract description 30
- 230000008018 melting Effects 0.000 claims abstract description 30
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 164
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000009987 spinning Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 22
- 239000012783 reinforcing fiber Substances 0.000 claims description 13
- 238000004898 kneading Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 21
- -1 aromatic diol Chemical class 0.000 description 19
- 238000004458 analytical method Methods 0.000 description 17
- 238000006114 decarboxylation reaction Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 17
- 238000000465 moulding Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 13
- 239000000047 product Substances 0.000 description 13
- 239000004744 fabric Substances 0.000 description 12
- 230000003746 surface roughness Effects 0.000 description 12
- 125000003118 aryl group Chemical group 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 238000007086 side reaction Methods 0.000 description 10
- 239000002131 composite material Substances 0.000 description 9
- 229920001169 thermoplastic Polymers 0.000 description 8
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 6
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 6
- 239000004416 thermosoftening plastic Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000003733 fiber-reinforced composite Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- KAUQJMHLAFIZDU-UHFFFAOYSA-N 6-Hydroxy-2-naphthoic acid Chemical compound C1=C(O)C=CC2=CC(C(=O)O)=CC=C21 KAUQJMHLAFIZDU-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 238000013016 damping Methods 0.000 description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 4
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 125000001309 chloro group Chemical group Cl* 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 238000009940 knitting Methods 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 125000001624 naphthyl group Chemical group 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- JWAZRIHNYRIHIV-UHFFFAOYSA-N 2-naphthol Chemical compound C1=CC=CC2=CC(O)=CC=C21 JWAZRIHNYRIHIV-UHFFFAOYSA-N 0.000 description 2
- 125000000094 2-phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical group [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 125000003710 aryl alkyl group Chemical group 0.000 description 2
- 125000002102 aryl alkyloxo group Chemical group 0.000 description 2
- 125000004104 aryloxy group Chemical group 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 125000000051 benzyloxy group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])O* 0.000 description 2
- VCCBEIPGXKNHFW-UHFFFAOYSA-N biphenyl-4,4'-diol Chemical group C1=CC(O)=CC=C1C1=CC=C(O)C=C1 VCCBEIPGXKNHFW-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000007857 degradation product Substances 0.000 description 2
- YVIGPQSYEAOLAD-UHFFFAOYSA-L disodium;dodecyl phosphate Chemical compound [Na+].[Na+].CCCCCCCCCCCCOP([O-])([O-])=O YVIGPQSYEAOLAD-UHFFFAOYSA-L 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 125000001153 fluoro group Chemical group F* 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 150000002576 ketones Chemical class 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002074 melt spinning Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 125000000286 phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- UPHOPMSGKZNELG-UHFFFAOYSA-N 2-hydroxynaphthalene-1-carboxylic acid Chemical compound C1=CC=C2C(C(=O)O)=C(O)C=CC2=C1 UPHOPMSGKZNELG-UHFFFAOYSA-N 0.000 description 1
- ZSXQJXAZWUQHFW-UHFFFAOYSA-N 3-(propylcarbamoyl)benzoic acid Chemical compound CCCNC(=O)C1=CC=CC(C(O)=O)=C1 ZSXQJXAZWUQHFW-UHFFFAOYSA-N 0.000 description 1
- ZRDZEIQSIMUYCJ-UHFFFAOYSA-N 4-(propylcarbamoyl)benzoic acid Chemical compound CCCNC(=O)C1=CC=C(C(O)=O)C=C1 ZRDZEIQSIMUYCJ-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 150000004984 aromatic diamines Chemical class 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 229950011260 betanaphthol Drugs 0.000 description 1
- 210000004899 c-terminal region Anatomy 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- 238000001601 dielectric barrier discharge ionisation Methods 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 125000003253 isopropoxy group Chemical group [H]C([H])([H])C([H])(O*)C([H])([H])[H] 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000006606 n-butoxy group Chemical group 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 238000012667 polymer degradation Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- QLNJFJADRCOGBJ-UHFFFAOYSA-N propionamide Chemical compound CCC(N)=O QLNJFJADRCOGBJ-UHFFFAOYSA-N 0.000 description 1
- NJSJBTVAKUBCKG-UHFFFAOYSA-N propylazanide Chemical compound CCC[NH-] NJSJBTVAKUBCKG-UHFFFAOYSA-N 0.000 description 1
- 238000000045 pyrolysis gas chromatography Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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]
-
- 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
- D10B2401/06—Load-responsive characteristics
- D10B2401/062—Load-responsive characteristics stiff, shape retention
-
- 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
- D10B2505/00—Industrial
- D10B2505/12—Vehicles
Definitions
- the present invention relates to a liquid crystal polyester fiber and a method for producing the same.
- thermoplastic fibers in the case of intermediate materials for fiber-reinforced composite materials, the thermoplastic fibers are heat-sealed in a post-process, so hereinafter referred to as fusion (sometimes referred to as fibers) are known.
- Patent Document 1 Japanese Unexamined Patent Publication No. 1-280031 discloses a method for producing a flexible composite fiber useful for composite products, which consists of combining a reinforcing multifilament and a thermoplastic multifilament in layers. ing.
- Patent Document 2 Japanese Patent Application Laid-Open No.
- Patent Document 3 Japanese Patent Application Laid-Open No. 4-732257 discloses a method for producing a mixed yarn for a thermoplastic composite of continuous thermoplastic fibers and continuous reinforcing fibers.
- Composite yarns containing such continuous reinforcing fibers and continuous thermoplastic fibers are generally used as precursors for fiber-reinforced composite materials. It is more flexible than intermediate materials made by melting and impregnating thermoplastic resin into reinforced fiber tows and fabrics, and can be shaped into various shapes such as cylindrical and dome shapes by weaving and knitting. It is easy to form a fabric with a large three-dimensional deformation. Therefore, it can be effectively used as a raw material for sheet-like fiber-reinforced moldings having three-dimensional features such as duct tubes and automobile bumpers.
- liquid crystal polyester fibers made of liquid crystal polyester which is a thermoplastic resin with excellent vibration damping properties, are used.
- a reinforcing fiber or fusible fiber it can be expected that a molded article having excellent damping properties can be obtained.
- liquid crystalline polyester fibers are used as fusible fibers
- thermal decomposition gas is generated from the liquid crystalline polyester fibers when heated to a temperature at which fusion processing is possible, and many bubbles are formed inside and on the surface of the resulting fiber-reinforced molding.
- the object of the present invention is to provide a liquid crystalline polyester fiber that does not generate air bubbles when used as a fusible fiber and is heat fused, and that can be used to produce a molded product with excellent hue.
- the inventors of the present invention made intensive studies to achieve the above object, and found that the thermal decomposition gas generated from the liquid crystalline polyester fiber when heated to a predetermined temperature is at the end of the liquid crystalline polyester constituting the liquid crystalline polyester fiber. It was found that when a carboxy group is present, the occurrence of decarboxylation at the carboxy group is the trigger. Furthermore, the liquid crystal polyester constituting the liquid crystal polyester fiber contains ketone bonds generated by a side reaction, and the ketone bond affects the hue of the liquid crystal polyester fiber, which led to the completion of the present invention. .
- the total carboxy terminal content is 5.0 meq/kg or less (preferably 4.0 meq/kg or less, more preferably 3.0 meq/kg or less, still more preferably 2.5 meq/kg or less, still more preferably 2.0 meq/kg or less) and a ketone bond amount of 0.05 mol% or less (preferably 0.04 mol% or less, more preferably 0.03 mol% or less).
- a method for producing a liquid crystalline polyester fiber comprising at least: [Aspect 7]
- the heat history TH represented by the following formula (1) is 250 to 1100 (preferably 300 to 1000, more preferably 350 to 950, more preferably 400 ⁇ 900), a method for producing a liquid crystal polyester fiber.
- Mp 0 is the melting point (° C.) of the liquid crystalline polyester
- x 1, 2, ... during residence
- T x (T 1 , T 2 , . is the heating temperature (° C.) of
- y is the residence time (minutes) in the heating temperature region where T x ⁇ (Mp 0 +10) after the input.
- M and y are not integers, they are rounded off and calculated as integers
- M is an integer that satisfies M ⁇ y+1.
- liquid crystalline polyester fiber of the present invention it is possible to suppress the generation of gas during heating and melting, and it is possible to produce a molded product with few air bubbles and excellent hue.
- the liquid crystalline polyester fiber of the present invention is composed of liquid crystalline polyester.
- the liquid crystalline polyester includes structural units derived from, for example, an aromatic diol, an aromatic dicarboxylic acid, an aromatic hydroxycarboxylic acid, and the like, and unless the effects of the present invention are impaired, an aromatic diol, an aromatic dicarboxylic acid, an aromatic hydroxy
- the structural unit derived from carboxylic acid is not particularly limited in its chemical constitution.
- the liquid crystalline polyester may contain structural units derived from aromatic diamines, aromatic hydroxyamines or aromatic aminocarboxylic acids to the extent that the effects of the present invention are not impaired.
- preferred structural units include those shown in Table 1.
- Y in the formula is independently a hydrogen atom, a halogen atom (e.g., fluorine atom, chlorine atom, bromine atom, iodine atom, etc.), alkyl group (e.g., alkyl group having 1 to 4 carbon atoms such as methyl group, ethyl group, isopropyl group, t-butyl group, etc.), alkoxy group (e.g., methoxy group, ethoxy group, isopropoxy group, n-butoxy group, etc.), aryl group (e.g., phenyl group, naphthyl group, etc.), aralkyl group (e.g., benzyl group (phenylmethyl group), phenethyl group (phenylethyl group), etc.), aryloxy groups (eg, phenoxy group), aralkyloxy groups (eg, phenoxy group), aralkyloxy groups (eg, phen
- More preferred structural units include structural units described in Examples (1) to (18) shown in Tables 2, 3 and 4 below.
- the structural unit in the formula is a structural unit capable of exhibiting multiple structures, two or more of such structural units may be combined and used as a structural unit that constitutes the polymer.
- n is an integer of 1 or 2
- Y 1 and Y 2 are each independently a hydrogen atom, a halogen atom (e.g., fluorine atom, chlorine atom, bromine atom, iodine atom, etc.), an alkyl group (e.g., methyl group, ethyl group, isopropyl group, t-butyl group, etc.) Alkyl groups having 1 to 4 carbon atoms, etc.), alkoxy groups (e.g., methoxy, ethoxy, isopropoxy, n-butoxy, etc.), aryl groups (e.g., phenyl, naphthyl, etc.), aralkyl groups (e.g., , benzyl group (phenylmethyl group), phenethyl group (phenylethyl group), etc.), aryl
- Z includes a substituent represented by the following formula.
- the liquid crystalline polyester may preferably be a combination having a naphthalene skeleton as a structural unit. It is particularly preferred to contain both structural units (A) derived from hydroxybenzoic acid and structural units (B) derived from hydroxynaphthoic acid.
- the structural unit (A) includes the following formula (A)
- the structural unit (B) includes the following formula (B).
- the ratio of units (B) may preferably range from 9/1 to 1/1, more preferably from 7/1 to 1/1, even more preferably from 5/1 to 1/1.
- the total amount of the structural units (A) and the structural units (B) may be, for example, 65 mol% or more, more preferably 70 mol% or more, and still more preferably 80 mol% of all structural units. % or more. Liquid crystalline polyesters containing 4 to 45 mol % of the constituent units of (B) in the polymer are particularly preferred.
- the liquid crystalline polyester contains a structural unit derived from 4-hydroxybenzoic acid as an aromatic hydroxycarboxylic acid, and may contain a structural unit derived from an aromatic dicarboxylic acid and a structural unit derived from an aromatic diol.
- a structural unit derived from an aromatic dicarboxylic acid may contain at least one selected from the group consisting of the following formula (C) and the following formula (D) as a structural unit derived from an aromatic dicarboxylic acid, and as a structural unit derived from an aromatic diol, the following formula At least one selected from the group consisting of (E) and formula (F) below may be used.
- a liquid crystal polyester comprising a structural unit (D) derived from an acid (formula (D) below) and a structural unit (E) derived from 4,4'-dihydroxybiphenyl as an aromatic diol (formula (E) below),
- the liquid crystalline polyester may contain structural units derived from 4-hydroxybenzoic acid, preferably 50 mol% or more, more preferably 53 mol% or more, still more preferably 60 mol% or more.
- the upper limit of the content of structural units derived from 4-hydroxybenzoic acid in the liquid crystal polyester is not particularly limited, but may be, for example, 90 mol% or less, preferably 88 mol% or less, more preferably 85 mol%. It may be below.
- the melting point (hereinafter sometimes referred to as Mp 0 ) of the liquid crystalline polyester used in the present invention is preferably in the range of 250 to 380°C, more preferably 255 to 370°C, still more preferably 260 to 360°C. may Further, the melting point of the liquid crystalline polyester may be more preferably 250 to 330° C., still more preferably 260 to 320° C. from the viewpoint of using the obtained liquid crystalline polyester fiber as a fusible fiber.
- the melting point referred to here is the main absorption peak temperature measured and observed with a differential scanning calorimeter (DSC; "TA3000" manufactured by Mettler Co., Ltd.) in accordance with JIS K 7121 test method.
- the liquid crystalline polyester fiber contains thermoplastic polymers such as polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyamide, polyphenylene sulfide, polyether ether ketone, and fluororesin within a range that does not impair the effects of the present invention. good too.
- various additives such as inorganic substances such as titanium oxide, kaolin, silica, and barium oxide, carbon black, colorants such as dyes and pigments, antioxidants, ultraviolet absorbers, and light stabilizers may be included.
- the liquid crystalline polyester fiber of the present invention may contain a metal catalyst acting on the decarboxylation reaction of the aromatic carboxylic acid. It may be less than ppm by weight, preferably less than 5 ppm by weight, more preferably less than 1 ppm by weight.
- the liquid crystalline polyester fiber of the present invention may contain 50% by weight or more of the liquid crystalline polyester, preferably 80% by weight or more, more preferably 90% by weight or more, still more preferably 95% by weight or more, and even more preferably 99% by weight. .9% by weight or more may be contained.
- the liquid crystalline polyester fiber of the present invention has a total carboxy terminal content (total CEG content) of 5.0 meq/kg or less.
- the total amount of CEG means the amount of carboxyl groups present at the ends of the molecules constituting the liquid crystal polyester fiber per 1 kg of the liquid crystal polyester fiber, and is a value measured by the method described in Examples below. be.
- the carboxy group present at the polymer terminal in the liquid crystalline polyester a structural unit derived from a monomer having a carboxy group such as an aromatic hydroxycarboxylic acid or an aromatic dicarboxylic acid forms the polymer terminal. It may be a carboxy group remaining unreacted in a structural unit present at the end of the polymer.
- the liquid crystalline polyester fiber of the present invention preferably has a total CEG content of 4.0 meq/kg or less, more preferably 3.0 meq/kg or less, and still more preferably 2.5 meq. /kg or less, even more preferably 2.0 meq/kg or less.
- the lower limit of the total CEG amount is not particularly limited, it may be, for example, 0.1 meq/kg or more.
- the liquid crystal polyester fiber of the present invention has a ketone bond amount of 0.05 mol% or less.
- the amount of ketone bonds means the ratio of the molar amount of ketone bonds to the total molar amount of ester bonds and ketone bonds (molar amount of ketone bonds/(molar amount of ester bonds + molar amount of ketone bonds)). and is a value measured by the method described in Examples below.
- the inventors of the present invention found that when a liquid crystal polyester resin is melt-processed, a ketone bond is formed from an ester bond due to a side reaction, and that the ketone bond affects the hue of the liquid crystal polyester fiber.
- the liquid crystalline polyester fiber of the present invention suppresses the formation of ketone bonds.
- the ketone bond amount may be preferably 0.04 mol % or less, more preferably 0.03 mol % or less.
- the lower limit of the ketone bond amount is not particularly limited, it may be, for example, 0.005 mol % or more.
- liquid crystal polyester fibers can exhibit extremely high mechanical properties by increasing the molecular weight of the polymer by heat-treating the spun raw yarn obtained by melt spinning and solid phase polymerization.
- the liquid crystalline polyester fiber of the present invention may be a spun yarn, or may be a heat-treated yarn obtained by solid phase polymerization within a range that does not impair the effects of the present invention.
- the melting point (Mp) of the liquid crystalline polyester fiber is raised from the melting point (Mp) of the raw yarn by solid state polymerization
- the liquid crystalline polyester fiber of the present invention is preferably a raw yarn when used as a fusible fiber. .
- the liquid crystalline polyester fiber of the present invention may have a total end weight of 50 meq/kg or more, preferably 60 meq/kg or more, more preferably 70 meq/kg or more.
- the total single end weight indicates the number of polymer chains and is used as an index for evaluating molecular weight. Considering that it is difficult to quantify all kinds of terminals depending on the composition of the liquid crystalline polyester, in the present invention, the total amount of one terminal is based on 1 kg of the liquid crystalline polyester fiber.
- the total amount (meq/kg) of the carboxy group derived from the carboxylic acid and the terminal from which carbon dioxide was eliminated by the decarboxylation reaction was calculated as the molar ratio of the structural unit derived from the hydroxycarboxylic acid to the total structural units in the liquid crystal polyester (hydroxycarboxylic acid It is defined as a numerical value obtained by dividing by (molar amount of acid-derived structural unit/molar amount of all structural units), and is a value measured by the method described in Examples below.
- the total amount of one end is within the above range, the polymerization of the liquid crystalline polyester does not proceed more than necessary and the molecular weight is relatively low, so that it can be used as a fusible fiber.
- the upper limit of the total amount of one end is not particularly limited, but if the molecular weight is too low, the strength required for processing the fiber may not be obtained, so for example, it may be 100 meq/kg or less, preferably 90 meq. /kg or less.
- the liquid crystalline polyester fiber of the present invention does not need to have high strength from the viewpoint of use as a fusible fiber.
- the strength may be less than 18 cN/dtex, preferably 2 to 16 cN/dtex, more preferably It may be 6 to 12 cN/dtex.
- the strength of the liquid crystalline polyester fiber refers to tensile strength, which is a value measured by the method described in Examples below.
- the liquid crystalline polyester fiber of the present invention may have a melting point of 380°C or less, preferably 250 to 350°C, more preferably 260 to 300°C, from the viewpoint of use as a fusible fiber.
- the melting point of the liquid crystal polyester fiber is a value measured by the method described in Examples below.
- the single fiber fineness of the liquid crystalline polyester fiber of the present invention can be appropriately selected depending on the application, etc.
- the single fiber fineness may be 0.5 to 50 dtex, preferably 1.0 to 35 dtex, more preferably. It may be 1.0 to 15 dtex, more preferably 1.5 to 10 dtex.
- the liquid crystalline polyester fiber of the present invention may be monofilament or multifilament.
- the number of filaments can be appropriately selected depending on the application, etc.
- the number of filaments may be 2 to 5000, preferably 3 to 4000, more preferably 5 to 3000.
- the total fineness of the liquid crystalline polyester fiber of the present invention can be appropriately selected depending on the application and the like. may be from 10 to 600 dtex.
- the CO 2 gas generation amount measured by the examples described later may be 2.0 mmol/kg or less, preferably 1.5 mmol/kg or less, more preferably 1.0 mmol/kg. /kg or less.
- the liquid crystalline polyester fiber of the present invention can keep the amount of ketone bonds low, it is excellent in hue. or more.
- the L * value indicates the L * value representing the lightness of the L * a * b * color system standardized by the Commission Internationale de l'Eclairage (CIE), and is measured by the method described in Examples below. value. The larger the L * value, the brighter the image, and the smaller the value, the darker the image. Although the upper limit of the L * value is not particularly limited, it may be 85 or less, for example.
- the liquid crystalline polyester fiber of the present invention can reduce the surface roughness of the fiber, probably because the amount of ketone bonds can be kept low.
- the surface roughness of the liquid crystalline polyester fiber affects the workability when used as a fusible fiber and the adhesiveness to reinforcing fibers, leading to deterioration of physical properties.
- the surface roughness Ra may be 1.0 ⁇ m or less, preferably 0.8 ⁇ m or less, more preferably 0.6 ⁇ m or less.
- the lower limit of the surface roughness Ra is not particularly limited, it may be, for example, 0.1 ⁇ m or more.
- Surface roughness Ra is the arithmetic average roughness measured according to JIS B 0601-2001, and in the roughness curve of the reference length, the unevenness of that section is the absolute deviation from the average line to the roughness curve It is expressed as the average value of the values.
- the surface roughness Ra is measured by the method described in Examples below.
- the method for producing the liquid crystalline polyester fiber of the present invention is not particularly limited as long as the total amount of CEG and the amount of ketone bonds in the liquid crystalline polyester fiber can be adjusted to the specific amounts as described above. and a step of discharging the melt-kneaded material from a nozzle and spinning it.
- the heat history TH represented by the following formula (1) may be 250 to 1100 in the melt-kneading step.
- Mp 0 is the melting point (° C.) of the liquid crystalline polyester
- x 1, 2, ...
- x M is the time (minutes) when the melt-kneaded product is discharged from the nozzle, and T x (T 1 , T 2 , . is the heating temperature (° C.) of , and y is the residence time (minutes) in the heating temperature region where T x ⁇ (Mp 0 +10) after the input.
- M and y are not integers, they are rounded off and calculated as integers, and M is an integer that satisfies M ⁇ y+1.
- TH represented by the above formula (1) is a residence time from when the liquid crystalline polyester is put into the extruder until it is discharged from the nozzle as a melt-kneaded product, and the liquid crystalline polyester has a carboxyl at the molecular terminal. It refers to the index of thermal history that indicates the degree of exposure to high temperatures that cause decarboxylation of groups and side reactions of ester bonds.
- the inventors of the present invention have found that when a liquid crystal polyester fiber has a carboxyl group at the end of the liquid crystalline polyester, when it is used as a fusible fiber and heated, the carboxyl group undergoes a decarboxylation reaction, and carbon dioxide is generated as a pyrolysis gas. found to occur. Therefore, in the manufacturing method of the liquid crystalline polyester fiber, it was found that the decarboxylation reaction of the carboxyl groups at the ends of the molecules can be reduced in advance by melt-kneading in the extruder at high temperatures for a long time, thereby reducing the carboxyl groups at the ends of the molecules. .
- the inventors have also found that when melt-kneaded for a long time at high temperature, the ester bond of the liquid crystalline polyester undergoes a side reaction to form a ketone bond. Therefore, in the present invention, the heat history of the liquid crystalline polyester is adjusted by adjusting the heating temperature and residence time in relation to its melting point, so that the decarboxylation reaction of the carboxy group at the end of the molecule proceeds while the side reaction of the ester bond occurs. can be suppressed.
- FIG. 1 is a schematic diagram showing an apparatus 100 used to produce liquid crystalline polyester fibers in accordance with one embodiment of the present invention.
- the apparatus 100 comprises an extruder 10, a gear pump 30, a spinning head 40, and a pipe 20 connecting them.
- the extruder 10 includes a hopper 11 into which liquid crystalline polyester is introduced, a barrel 12, a screw 13 rotating inside the barrel 12, and a vent 14.
- FIG. 1 illustrates the equipment necessary for explaining the method for producing the liquid crystalline polyester fiber of the present invention, the apparatus 100 may be equipped with other equipment as required.
- the solid liquid crystalline polyester charged from the hopper 11 is transported in the X direction, which is the traveling direction, in the barrel 12 by the rotation of the screw 13, and is heated by a known heater such as a heater installed in the barrel 12. Heated by a heating means. In addition to the heat transfer from the heating means, mechanical energy such as friction and shear is efficiently imparted between the inner wall of the barrel 12 and the screw 13, so that the solid state progresses in the X direction. Liquid crystalline polyester melts. Thereafter, the liquid crystalline polyester in a molten state is metered by a gear pump 30, passed through a pipe 20, transported to a spinning head 40, and discharged through a nozzle 41 at a predetermined spinning temperature. , can produce liquid crystal polyester fiber.
- the liquid crystalline polyester may be introduced into the extruder 10 as a resin composition containing the above-described thermoplastic polymer, various additives, catalysts, and the like.
- the heat history of the liquid crystal polyester in the apparatus 100 the heat history that affects the decarboxylation reaction of the carboxy group at the molecular terminal and the side reaction of the ester bond can be grasped by TH represented by the above formula (1).
- the liquid crystalline polyester is heated as it progresses in the X direction.
- the heating temperature T x in the device 100 every minute with x being an integer of 1 or more the heating temperature T x is until the residence time M, after the liquid crystalline polyester is put into the extruder 10
- the temperature of the device 100 at the position of the liquid crystalline polyester after x minutes is shown.
- the position after x minutes have passed since the injection is indicated by the distance in the X direction that the liquid crystalline polyester is transported in x minutes from the injection position.
- the distance can be calculated from the volume of the device 100, the transport speed of the screw 13, the transport speed of the gear pump 30, the predetermined time x minutes, and the like.
- the residence time M is the period from when the liquid crystalline polyester is put into the extruder 10 from the hopper 11 to when the liquid crystalline polyester is discharged from the nozzle 41 as a melt-kneaded product. indicates the dwell time.
- the residence time M can be calculated from the volume of the entire device 100 from the time the liquid crystalline polyester is charged until it is discharged, the transportation speed of the gear pump 30, etc.
- the entire device in FIG. 1, the barrel 12 + pipe 20 + gear pump 30 + volume of spinning head 40) [cm 3 ]/ ⁇ (rotation speed of gear pump [RPM] ⁇ transfer capacity per rotation speed of gear pump [cm 3 ]) ⁇ . is rounded off and calculated as an integer.
- the heating temperature T x does not rise sufficiently with respect to the melting point Mp 0 , and does not affect the heat history.
- y can be calculated from the volume of the device, the transportation speed of the gear pump, the area set to the low temperature, etc. If it is not an integer, it is rounded off and calculated as an integer.
- the temperature in the extruder 10 is set to start at a temperature of Mp 0 +10 ° C. or less, and then the set temperature is increased in the X direction. Increase and set the temperature above Mp 0 +10°C.
- the extruder In addition, from the viewpoint of adjusting the viscosity of the liquid crystalline polyester in a molten state when transported from the extruder 10 toward the spinning head 40, outside the extruder 10 (pipe 20, gear pump 30, and spinning head 40), the extruder Although the temperature may be less than or equal to the maximum temperature in 10, it is preferable to heat at a temperature above Mp 0 +10°C.
- T x when x is 1 to y satisfies the relationship T x ⁇ (Mp 0 +10)
- T x when x is y+1 to M is T x > (Mp 0 +10)
- TH is the sum of T x ⁇ (Mp 0 +10), which is a positive value, for all time x that satisfies the relationship T x >(Mp 0 +10) among the residence times M. It shows summation.
- T x -(Mp 0 +10) in the above formula (1) is an index of how high the temperature the liquid crystalline polyester is exposed to as a temperature condition that causes the decarboxylation reaction of the carboxy group at the end of the molecule and the side reaction of the ester bond.
- TH causes a decarboxylation reaction of the carboxy group at the end of the molecule and a side reaction of an ester bond during the residence time from when the liquid crystalline polyester is put into the extruder 10 until it is discharged from the nozzle 41 as a melt-kneaded product. It means an index related to thermal history that shows how much it has been exposed to such high temperatures.
- TH is too high, that is, if the heating temperature in the extruder is too high and/or the residence time is too long, the side reaction of the ester bonds in the liquid crystalline polyester will occur excessively, and the formation of ketone bonds cannot be suppressed. , the amount of ketone bonds increases, and the hue and surface roughness of the fiber tend to deteriorate.
- the value of TH is relatively large, the decarboxylation reaction of the terminal carboxyl groups of the liquid crystalline polyester proceeds sufficiently, so that the total amount of CEG becomes small and the amount of gas generated during heating is small.
- TH when the value of TH is too small, that is, when the heating temperature in the extruder is too low and/or the residence time is too short, the decarboxylation reaction of the carboxy group at the terminal of the liquid crystalline polyester does not easily proceed, and the molecular terminal Carboxy groups cannot be reduced, the total amount of CEG tends to increase, and the amount of gas generated during heating tends to increase. If the value of TH is relatively small, the amount of ketone bonds does not increase, so that the hue and surface roughness of the fiber do not deteriorate.
- TH may be preferably 300 or more, more preferably 350 or more, and even more preferably 400 or more. From the viewpoint of suppressing the formation of ketone bonds, TH may be preferably 1000 or less, more preferably 950 or less, and even more preferably 900 or less.
- the residence time M may be 6 minutes or longer, preferably 8 minutes or longer, and more preferably 10 minutes or longer, from the viewpoint of reducing carboxyl groups at the ends of the molecules. Also, from the viewpoint of suppressing the formation of ketone bonds, the time may be 40 minutes or less, preferably 30 minutes or less, more preferably 25 minutes or less. Further, of the residence time M, the time y for the liquid crystalline polyester to stay in the initial low temperature region of the melting point (Mp 0 ) of the liquid crystalline polyester + 10 ° C. or less is not particularly limited, but may be 1 minute or more, preferably It may be 2 minutes or longer, or 5 minutes or shorter.
- the maximum temperature of T x may be Mp 0 +30° C. or higher, preferably Mp 0 +40° C. or higher, more preferably Mp 0 +50° C. or higher, and still more preferably Mp from the viewpoint of reducing the carboxy group at the end of the molecule. 0 +55°C or higher. From the viewpoint of suppressing the formation of ketone bonds, the temperature may be Mp 0 +100° C. or lower, preferably Mp 0 +90° C. or lower, and more preferably Mp 0 +85° C. or lower.
- the decarboxylation reaction Since the decarboxylation reaction is progressing in the extruder 10, carbon dioxide is generated as a pyrolysis gas. From the viewpoint of removing carbon dioxide generated by the decarboxylation reaction to the outside of the system, further promoting the decarboxylation reaction, and reducing inclusion of the generated gas as bubbles in the fiber, for example, the vent 14 of the extruder 10 It is preferable to deaerate by connecting a vacuum pump or the like to reduce the pressure in the extruder 10 .
- the degree of vacuum may be 100 kPa or less in absolute pressure, preferably 80 kPa or less, and more preferably 60 kPa or less.
- a known extruder such as a single-screw extruder and a multi-screw extruder (two or more screws) can be used, and a twin-screw extruder is preferable from the viewpoint of improving kneading and degassing properties.
- melt-kneaded material containing the liquid crystalline polyester in the extruder 10 After obtaining a melt-kneaded material containing the liquid crystalline polyester in the extruder 10, it may be weighed by the gear pump 30, supplied to the spinning head 40, discharged from the nozzle 41, and melt-spun.
- Melt spinning can be performed by a known or commonly used method, and can be obtained by discharging from a nozzle at a predetermined spinning temperature and winding with a godet roller or the like.
- the liquid crystalline polyester fiber of the present invention can be used as a fusible fiber for producing a molding using it as a matrix.
- a fiber structure at least partially containing liquid crystalline polyester fibers can be used as an intermediate material for producing a molded product.
- the fiber structure containing the liquid crystalline polyester fiber of the present invention can be used in any fiber form such as staple fiber, shortcut fiber, filament yarn, spun yarn, string-like material, rope, etc., and liquid crystalline polyester fiber can be used. It can also be used as various cloths such as nonwoven fabrics, woven fabrics, and knitted fabrics. Such fibers and cloths can be produced using liquid crystalline polyester fibers by known methods.
- the fiber structure of the present invention may be a combination of liquid crystalline polyester fibers and other fibers as long as the effects of the present invention are not impaired.
- a composite yarn using a liquid crystal polyester fiber and another fiber for example, a mixed fiber yarn obtained by mixing a liquid crystal polyester fiber and another fiber, etc.
- composite fabrics using liquid crystal polyester fibers and other fibers for example, mixed fabrics in which liquid crystal polyester fibers are mixed with other fibers, fabrics made from liquid crystal polyester fibers and fabrics made from other fibers
- Laminates with other types, etc. can be used.
- the fiber structure is used for manufacturing a reinforced fiber molding (fiber reinforced composite material)
- the fiber structure may be a composite yarn or composite cloth containing reinforcing fibers as other fibers.
- the type of reinforcing fiber is not particularly limited as long as it has a melting point higher than that of the liquid crystal polyester fiber of the present invention. At least one selected from the group consisting of benzobisimidazole fibers, polyparaphenylenebenzobisthiazole fibers, ceramic fibers, and metal fibers. These reinforcing fibers may be used singly or in combination of two or more.
- the molded body may be obtained by molding a fiber structure.
- the molded body can be obtained by heating and molding the fiber structure above the melting point of the liquid crystal polyester fiber.
- the molding method is not particularly limited as long as the liquid crystalline polyester fibers are melted and integrated, and known molding methods for molding can be used. Since the liquid crystalline polyester fiber of the present invention has excellent hue and can suppress the generation of air bubbles during heat fusion, a molded article having excellent appearance can be obtained.
- the obtained molded product has excellent vibration damping properties, and can be effectively used for applications that generate vibration, such as duct tubes and automobile bumpers. can be done.
- total fineness, single fiber fineness Based on JIS L 1013: 2010 8.3.1 A method, the liquid crystal polyester fiber is wrapped around 1 m ⁇ 100 rounds (total 100 m) using a measuring instrument "Wrap Reel by Motor Driven” manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd. The weight (g) was multiplied by 100 and measured twice per standard, and the average value was taken as the total fineness (dtex) of the obtained liquid crystalline polyester fiber. The quotient obtained by dividing this value by the number of filaments was taken as the single fiber fineness (dtex).
- the degradation product is separated by HPLC, and the peak area of the degradation product having a carboxy group is compared with a calibration curve prepared by HPLC analysis of each standard to determine the amount of carboxy terminal derived from each monomer. (meq/kg) was quantified.
- the amount of CEG derived from monovalent carboxylic acids such as 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid can be obtained by directly quantifying 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid.
- the amount of CEG derived from divalent carboxylic acids such as terephthalic acid, isophthalic acid and 6-naphthalenedicarboxylic acid is terephthalic acid mono n-propylamide, isophthalic acid mono n-propylamide and 2,6-naphthalenedicarboxylic acid mono n- It is obtained by quantifying a substance in which one carboxyl group is amidated, such as propylamide. The total amount of all carboxy termini contained in each sample was taken as the total carboxy terminus content (total CEG content) (meq/kg) of that sample.
- the liquid crystal polyester fiber sample was decomposed using n-propylamine, and the carboxy terminal amount derived from hydroxycarboxylic acid and the terminal carboxy group derived from hydroxycarboxylic acid were decarboxylated.
- the total amount of terminals derived from hydroxycarboxylic acid is calculated as the number of structural units derived from hydroxycarboxylic acid with respect to all the structural units in the liquid crystalline polyester of the sample. The value obtained by dividing by the molar ratio was taken as the total single terminal amount (meq/kg) of the sample.
- ketone binding amount The amount of ketone binding was calculated by the pyrolysis gas chromatography method described in Polymer Degradation and Stability, 76, 85-94 (2002). Specifically, using a pyrolyzer ("PY2020iD” manufactured by Frontier Lab Co., Ltd.), a liquid crystal polyester fiber sample is heated in the presence of tetramethylammonium hydroxide (TMAH), and is pyrolyzed/methylated into gas. generated. This gas was analyzed using gas chromatography (manufactured by Agilent Technologies, Inc., "GC-6890N”), and the ketone bond amount (mol%) was determined from the peak area derived from the ketone bond and the peak area derived from the ester bond. Calculated.
- TMAH tetramethylammonium hydroxide
- the L * value was measured using a spectrophotometer "CM-3700A” manufactured by Konica Minolta Co., Ltd., specular reflection processing: SCE, measurement diameter: LAV (25.4 mm), UV conditions: 100% Full, field of view: 2 degrees, Main light source: Measured under the condition of C light source.
- CM-3700A manufactured by Konica Minolta Co., Ltd.
- specular reflection processing SCE
- measurement diameter LAV (25.4 mm)
- UV conditions 100% Full
- field of view 2 degrees
- Main light source Measured under the condition of C light source.
- GC gas chromatograph
- a second polyimide film (same as above) was placed on the metal plate. This was sandwiched from above and below with a flat plate heating press apparatus under a pressure of 0.1 MPa or less, and contact-heated for 5 minutes at +20° C., the melting point of the liquid crystalline polyester fiber. Then, after applying a pressure of 2 MPa for 1 minute, the plate was opened to the atmosphere and cooled to 100° C. or less to obtain a liquid crystal polyester fiber-derived resin plate as a sample for appearance evaluation. The front and back of a square area of 6 cm on a side in the center of this sample for appearance evaluation was observed with a magnifying glass, and the number of air bubbles with a major axis of 1 mm or more was counted.
- Example 1 Liquid crystal polyester ( ⁇ ) (Mp 0 : 281 ° C.) chip (granular molded body )It was used. The chips are put into a ⁇ 15mm twin-screw extruder (manufactured by Technobell Co., Ltd., "KZW15TW-45MG-NH (-700)”), melt-kneaded at a maximum temperature of 365 ° C., and weighed with a gear pump while being melt-kneaded at the spinning head. supplied things.
- the residence time and temperature profile from the twin-screw extruder to the spinning head were set as shown in Table 5, and TH was adjusted to 553.
- a decompression pump (dry pump manufactured by Orion Machinery Co., Ltd., "KRF40A-V-01B") is connected through a metal pipe from the vent part in the middle of the twin-screw extruder, and the resin non-filled space in the twin-screw extruder is connected.
- the spinning head was equipped with a spinneret with a hole diameter of 0.1 mm ⁇ , a land length of 0.14 mm, and 40 holes.
- a liquid crystalline polyester fiber (spun raw yarn) was obtained by winding on a bobbin in minutes.
- Example 1 A method for calculating TH will be described using the manufacturing conditions of Example 1 as an example.
- Table 5 shows the values of the heating temperature T x per minute at the residence time M, T x ⁇ (Mp 0 +10) in formula (1), and TH in Example 1.
- Mp 0 is 281° C.
- T x ⁇ (Mp 0 +10) is satisfied when T x is 260° C. and x is 1 to 2.
- Time y is 2
- T x ⁇ (Mp 0 +10) shows a positive value when x is y+1 (that is, 3) or more.
- TH 553 can be calculated by adding all numerical values of T x ⁇ (Mp 0 +10) when x is y+1 to M (that is, 3 to 14). It was calculated in the same manner in the following examples and comparative examples.
- Example 2 After setting the maximum temperature in the twin-screw extruder to 340 ° C., the temperature profile was changed to obtain a liquid crystal polyester fiber (spun yarn) in the same manner as in Example 1 except that TH was adjusted to 403. rice field. Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- Example 3 After setting the residence time to 11 minutes and the maximum temperature in the twin-screw extruder to 340 ° C., the TH was adjusted to 335 by changing the temperature profile, and the hole diameter was 0.1 mm ⁇ , the land length was 0.14 mm, A liquid crystalline polyester fiber (spun Raw thread) was obtained. Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- Example 4 A liquid crystal polyester fiber ( Spinning raw yarn) was obtained.
- Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- Example 5 After setting the residence time to 11 minutes and the maximum temperature in the twin-screw extruder to 360 ° C., the TH was adjusted to 435 by changing the temperature profile, and the hole diameter was 0.1 mm ⁇ , the land length was 0.14 mm, A liquid crystalline polyester fiber (raw yarn) was obtained in the same manner as in Example 1, except that a spinneret with 100 holes was used and the melt-kneaded material was discharged at a discharge rate of 56.0 g/min. Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- Example 6 After setting the residence time to 27 minutes and the maximum temperature in the twin-screw extruder to 340° C., TH was adjusted to 836 by changing the temperature profile, and the hole diameter was 0.125 mm ⁇ , the land length was 0.175 mm, Using a spinneret with 20 holes, the melt-kneaded material is discharged at a discharge rate of 11.0 g/min, and 5 of the 20 discharged filamentous materials are divided and wound at a winding speed of 1000 m/min. A liquid crystalline polyester fiber (spun raw yarn) was obtained in the same manner as in Example 1 except that the fiber was removed. Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- Example 7 A liquid crystal polyester fiber ( Spinning raw yarn) was obtained. Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- Example 8 Liquid crystal polyester ( ⁇ ) chips are put into a ⁇ 30mm single-screw extruder (manufactured by Osaka Seiki Co., Ltd., "3VSE-30-32N type"), melt-kneaded at a maximum temperature of 340 ° C., and weighed with a gear pump while spinning heads. The melt-kneaded material was supplied to. Here, the residence time and temperature profile from the single screw extruder to the spinning head were set as shown in Table 6, and TH was adjusted to 452. The spinning head was equipped with a spinneret with a hole diameter of 0.1 mm ⁇ , a land length of 0.14 mm, and 100 holes. A liquid crystalline polyester fiber (spun raw yarn) was obtained in the same manner as in Example 1 except that the fiber was wound at a minute. Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- a certain liquid crystalline polyester ( ⁇ ) Mp 0 : 348 ° C.
- TH A liquid crystalline polyester fiber (raw yarn) was obtained in the same manner as in Example 1, except that the was adjusted to 308.
- Table 7 shows the analysis results of the obtained liquid crystalline polyester fiber.
- the heat history of the liquid crystalline polyester was adjusted by the heating temperature and residence time in relation to its melting point, so that the total CEG amount could be reduced and the ketone bond amount can be suppressed. Therefore, the liquid crystalline polyester fibers of Examples 1 to 10 can suppress the amount of gas generated, and the resin plates produced using them can suppress the generation of air bubbles. In addition, the obtained liquid crystalline polyester fiber has an excellent hue and a small surface roughness, so that it can be suitably used for producing a molded article having excellent appearance and physical properties.
- Comparative Examples 1 to 3 and 5 since the heat history of the liquid crystalline polyester is small, the amount of ketone bonds can be suppressed, but the total amount of CEG cannot be sufficiently reduced. Therefore, the liquid crystalline polyester fibers of Comparative Examples 1 to 3 and 5 generate more CO 2 gas than those of Examples 1 to 10, and the resin plates produced using them also have air bubbles compared to those of these Examples. and many occur.
- Comparative Examples 4 and 6 the total amount of CEG can be reduced because the liquid crystalline polyester has a large heat history, but a large amount of ketone bonds is generated. Therefore, the liquid crystalline polyester fibers of Comparative Examples 4 and 6 have lower L * values and are inferior in hue as compared with Examples 1-10. Further, the liquid crystalline polyester fibers of Comparative Examples 4 and 6 have a larger surface roughness Ra than those of Examples 1-10.
- the liquid crystalline polyester fiber of the present invention can suppress the generation of gas during heating and has an excellent hue, so it can be used as a fusible fiber for producing a molded article (for example, a fiber reinforced composite material). .
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Abstract
Description
〔態様1〕
全カルボキシ末端量(全CEG量)が5.0meq/kg以下(好ましくは4.0meq/kg以下、より好ましくは3.0meq/kg以下、さらに好ましくは2.5meq/kg以下、さらにより好ましくは2.0meq/kg以下)であり、且つケトン結合量が0.05mol%以下(好ましくは0.04mol%以下、より好ましくは0.03mol%以下)である、液晶ポリエステル繊維。
〔態様2〕
態様1に記載の液晶ポリエステル繊維であって、融点が380℃以下(好ましくは250~350℃、より好ましくは260~300℃)である、液晶ポリエステル繊維。
〔態様3〕
態様1または2に記載の液晶ポリエステル繊維であって、強度が18cN/dtex未満(好ましくは2~16cN/dtex、より好ましくは6~12cN/dtex)である、液晶ポリエステル繊維。
〔態様4〕
態様1~3のいずれか一態様に記載の液晶ポリエステル繊維であって、4-ヒドロキシ安息香酸に由来する構成単位を50モル%以上(好ましくは53モル%以上、より好ましくは60モル%以上)有する液晶ポリエステルを含む、液晶ポリエステル繊維。
〔態様5〕
態様1~4のいずれか一態様に記載の液晶ポリエステル繊維であって、全片末端量が50meq/kg以上(好ましくは55meq/kg以上、より好ましくは60meq/kg以上)である、液晶ポリエステル繊維。
〔態様6〕
態様1~5のいずれか一態様に記載の液晶ポリエステル繊維を製造する方法であって、押出機内で液晶ポリエステルを溶融混練する工程と、溶融混練物をノズルから吐出して紡糸する工程と、を少なくとも備える、液晶ポリエステル繊維の製造方法。
〔態様7〕
態様6に記載の製造方法であって、溶融混練工程において、下記式(1)で表される熱履歴THが250~1100(好ましくは300~1000、より好ましくは350~950、さらに好ましくは400~900)である、液晶ポリエステル繊維の製造方法。
〔態様8〕
態様6または7に記載の製造方法であって、押出機が二軸押出機である、液晶ポリエステル繊維の製造方法。
〔態様9〕
態様1~5のいずれか一態様に記載の液晶ポリエステル繊維を少なくとも一部に含んで構成された繊維構造体。
〔態様10〕
態様9に記載の繊維構造体であって、さらに強化繊維を含む、繊維構造体。
〔態様11〕
態様9または10に記載の繊維構造体を、前記液晶ポリエステル繊維の融点以上で加熱して成型する、成型体の製造方法。
本発明の液晶ポリエステル繊維は、液晶ポリエステルで構成される。液晶ポリエステルとしては、例えば芳香族ジオール、芳香族ジカルボン酸、芳香族ヒドロキシカルボン酸等に由来する構成単位からなり、本発明の効果を損なわない限り、芳香族ジオール、芳香族ジカルボン酸、芳香族ヒドロキシカルボン酸に由来する構成単位は、その化学的構成については特に限定されるものではない。また、本発明の効果を阻害しない範囲で、液晶ポリエステルは、芳香族ジアミン、芳香族ヒドロキシアミンまたは芳香族アミノカルボン酸に由来する構成単位を含んでいてもよい。例えば、好ましい構成単位としては、表1に示す例が挙げられる。
本発明の液晶ポリエステル繊維の製造方法は、液晶ポリエステル繊維の全CEG量およびケトン結合量を上述のような特定量に調整することができれば特に限定されないが、押出機内で液晶ポリエステルを溶融混練する工程と、溶融混練物をノズルから吐出して紡糸する工程と、を少なくとも備えていてもよい。
まず、ホッパ11から投入された液晶ポリエステルは、x=0(分)として滞留を開始する。バレル12内において、液晶ポリエステルはX方向に進行するにつれて加熱される。xを1以上の整数として1分毎における装置100中の加熱温度Txを把握する場合、加熱温度Txは、滞留時間Mまでの間で、液晶ポリエステルを押出機10内に投入してからx分経過後に当該液晶ポリエステルが位置している箇所における装置100の温度を示す。投入してからx分経過後の箇所は、投入箇所からx分間で液晶ポリエステルが輸送される距離をX方向に離れた箇所で表される。当該距離は、装置100の容積やスクリュ13の輸送速度、ギアポンプ30の輸送速度、所定の時間x分等から算出することができる。
一方、THの数値が小さすぎる、すなわち、押出機内での加熱温度が低すぎる、および/または滞留時間が短すぎる場合、液晶ポリエステルの末端のカルボキシ基の脱炭酸反応が進行しにくく、分子末端のカルボキシ基を低減できず、全CEG量が大きくなり、加熱時のガス発生量が増加する傾向にある。なお、THの数値が比較的小さいと、ケトン結合量は増加しないため、繊維の色相や表面粗さは悪化しない。
本発明の液晶ポリエステル繊維は、それをマトリックスとして用いた成型体を製造するための融着繊維として使用することができる。融着繊維として使用するにあたり、液晶ポリエステル繊維を少なくとも一部に含む繊維構造体を成型体製造の中間材料として使用することができる。
本発明において、成型体は、繊維構造体を成型して得ることができるものであればよく、例えば、繊維構造体を成型した、強化繊維を含まない成型体であってもよく、繊維構造体を強化繊維とともに成型した、強化繊維成型体であってもよい。繊維構造体は、柔軟性を持たせることができるため、織り加工、編み加工等により筒状やドーム状などの様々な立体的形状の成型体を形成することが可能である。
JIS L 1013:2010 8.3.1 A法に基づき、株式会社大栄科学精器製作所製検尺器「Wrap Reel by Motor Driven」を用いて液晶ポリエステル繊維を1周1m×100周(計100m)のカセに巻き、その重量(g)を100倍して1水準当たり2回の測定を行い、その平均値を、得られた液晶ポリエステル繊維の総繊度(dtex)とした。また、この値をフィラメント本数で除した商を単繊維繊度(dtex)とした。
JIS K 7121に準拠し、示差走査熱量計(DSC;メトラー社製、「TA3000」)を用いて測定し、観察される主吸収ピーク温度を融点とした。具体的には、前記DSC装置に、試料10~20mgをとりアルミ製パンへ封入した後、キャリヤーガスとして窒素を100mL/分の流量で流し、25℃から20℃/分で昇温したときの液晶ポリエステル由来の吸熱ピークを測定した。
JIS L 1013:2010 8.5.1を参考に、株式会社島津製作所製オートグラフ「AGS-100B」を用いて、試験長10cm、引張速度10cm/分の条件で、糸条1サンプルにつき6回の引張試験を行い、その平均引張強力(cN)を上述の方法で測定した総繊度(dtex)で割り、強度(cN/dtex)を算出した。
液晶ポリエステル繊維試料をd90=100μm以下(d90:粒子径分布において累積容積が90%となる粒子径)になるまで凍結粉砕し、その粉砕試料に大過剰のn-プロピルアミンを加え、40℃で90分間加熱攪拌処理を行い、試料を分解した。この場合、高分子鎖の内部に存在したエステル結合はカルボン酸n-プロピルアミドとヒドロキシ基に分解され、高分子鎖の末端に存在したカルボキシ基(CEG)とヒドロキシ基はそのままカルボキシ基とヒドロキシ基から変化しないので、HPLC法により分解物を分離し、カルボキシ基を有する分解物のピーク面積を、それぞれの標品のHPLC分析により作成した検量線と比較することで各々のモノマー由来のカルボキシ末端量(meq/kg)を定量した。例えば、4-ヒドロキシ安息香酸や6-ヒドロキシ-2-ナフトエ酸といった一価のカルボン酸由来のCEG量は、そのまま4-ヒドロキシ安息香酸や6-ヒドロキシ-2-ナフトエ酸を定量することで求められ、テレフタル酸やイソフタル酸や6-ナフタレンジカルボン酸といった二価のカルボン酸由来のCEG量は、テレフタル酸モノn-プロピルアミドやイソフタル酸モノn-プロピルアミドや2,6-ナフタレンジカルボン酸モノn-プロピルアミドといった片方のカルボキシ基がアミド化した物質を定量することで求められる。各試料が含む全てのカルボキシ末端量の合計を、その試料の全カルボキシ末端量(全CEG量)(meq/kg)とした。
上記の全CEG量の測定と同様に、液晶ポリエステル繊維試料にn-プロピルアミンを用いて分解し、ヒドロキシカルボン酸由来のカルボキシ末端量、およびヒドロキシカルボン酸由来の末端のカルボキシ基が脱炭酸反応して生じる末端量の合計量(meq/kg)を定量した。例えば、4-ヒドロキシ安息香酸由来の末端量は、4-ヒドロキシ安息香酸およびフェノールを定量することで求められ、6-ヒドロキシ-2-ナフトエ酸由来の末端量は、6-ヒドロキシ-2-ナフトエ酸および2-ナフトールを定量することで求められる。ヒドロキシカルボン酸以外のジオールやジカルボン酸由来等の末端量を考慮するために、ヒドロキシカルボン酸由来の末端量の合計を、当該試料の液晶ポリエステル中の全構成単位に対するヒドロキシカルボン酸由来の構成単位のモル比で除した値を、その試料の全片末端量(meq/kg)とした。
ケトン結合量は、Polymer Degradation and Stability、76、85-94(2002)に記載される、熱分解ガスクロマトグラフィー法によって算出した。具体的には、熱分解装置(フロンティア・ラボ株式会社製、「PY2020iD」)を用いて、液晶ポリエステル繊維試料を水酸化テトラメチルアンモニウム(TMAH)共存下で加熱し、熱分解/メチル化によりガスを発生させた。このガスをガスクロマトグラフィー(アジレント・テクノロジー株式会社製、「GC-6890N」)を用いて分析し、ケトン結合に由来するピーク面積およびエステル結合に由来するピーク面積からケトン結合量(mol%)を算出した。
L*値は、コニカミノルタ株式会社製分光光度計「CM-3700A」を用いて、正反射処理:SCE、測定径:LAV(25.4mm)、UV条件:100%Full、視野:2度、主光源:C光源の条件で測定した。
キーエンス社製のレーザーマイクロスコープ(コントローラ部「VK-X200」、測定部「VK-X210」)を用いて、倍率3000倍(対物150倍×20)にて、繊維長手方向10点について、基準長さを0.8mmとして繊維表面の算術平均粗さ(Ra)(JIS B 0601:2001記載の定義に準拠)を計測し、10点の平均値を本発明の表面粗さRa(μm)とした。
液晶ポリエステル繊維を加熱した際のCO2ガス発生量を、熱分解GC-BID法にて評価した。具体的には、まず液晶ポリエステル繊維をd90=100μm以下になるまで凍結粉砕し分析用試料とした。これを試料導入部にパイロライザー、ガス検知器にBID(誘電体バリア放電イオン化検出器)を備えたGC(ガスクロマトグラフ)装置を用いて、300℃で10分間処理し生じたガスからCO2を分離検出し定量した。測定は同一試料に対して3回行い、平均値をその試料からのCO2ガス発生量(mmol/kg)とした。
丸編機(丸善産業株式会社製、「MR-1」、径10cm、28ゲージ)を用いて液晶ポリエステル繊維のニット生地を作製した。この生地を一辺10cmの正方形に裁断したものを3枚重ねた状態のものを用意した。一方、離型フィルムとして用意したポリイミドフィルム(宇部興産株式会社製、ユーピレックス-S、125S)の上に、1辺10cmの正方形状の穴が開いた、厚さ1mmのSUS304金属板を乗せ、正方形の穴の部分に上述の3枚重ねのニット生地を収めたのち、2枚目のポリイミドフィルム(同上)を金属板の上に乗せた。これを平板加熱プレス装置で、圧力0.1MPa以下で上下から挟みこみ、液晶ポリエステル繊維の融点+20℃で5分間接触加熱した。その後、2MPaの圧力を1分間かけた後、大気開放して100℃以下まで冷却することで、外観評価用試料である液晶ポリエステル繊維由来樹脂板を得た。この外観評価用試料の中央、一辺6cmの正方形の領域の表裏をルーペで観察し、長径1mm以上の気泡の数をカウントした。
下記式で示した構成単位(A)と(B)が(A)/(B)=73/27(mol比)である液晶ポリエステル(α)(Mp0:281℃)のチップ(粒状成型体)を使用した。このチップをΦ15mm二軸押出機(株式会社テクノベル製、「KZW15TW-45MG-NH(-700)」)に投入し、最大温度365℃で溶融混練し、ギアポンプで計量しつつ、紡糸頭に溶融混練物を供給した。ここで、二軸押出機から紡糸頭までの滞留時間および温度プロファイルを表5に示すように設定し、THを553に調整した。このとき、二軸押出機の途中のベント部より金属管を介して減圧ポンプ(オリオン機械株式会社製ドライポンプ、「KRF40A-V-01B」)を接続し、二軸押出機内の樹脂非充満空間を60kPaまで減圧を行った。
紡糸頭には孔径0.1mmφ、ランド長0.14mm、孔数40個の紡糸口金を備えており、紡糸口金から吐出量22.0g/分で溶融混練物を吐出し、巻き取り速度1000m/分でボビンに巻き取り液晶ポリエステル繊維(紡糸原糸)を得た。この際、紡糸口金直下に配置したオイリングガイドから、2重量%のドデシルリン酸ナトリウム(富士フイルム和光純薬工業株式会社製、和光一級)水溶液を紡糸原糸に付与した。この水溶液の付与量は1.4g/分であり、紡糸原糸に対するドデシルリン酸ナトリウムの付着比率は計算上0.1重量%であった。得られた液晶ポリエステル繊維の分析結果を表7に示す。
二軸押出機における最大温度を340℃に設定した上で、温度プロファイルを変更することにより、THを403に調整したこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を11分、二軸押出機における最大温度を340℃に設定した上で、温度プロファイルを変更することにより、THを335に調整したこと、および孔径0.1mmφ、ランド長0.14mm、孔数100個の紡糸口金を用い、吐出量28.0g/分で溶融混練物を吐出し、巻き取り速度500m/分で巻き取ったこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を27分、二軸押出機における最大温度を360℃に設定した上で、温度プロファイルを変更することにより、THを996に調整したこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を11分、二軸押出機における最大温度を360℃に設定した上で、温度プロファイルを変更することにより、THを435に調整したこと、および孔径0.1mmφ、ランド長0.14mm、孔数100個の紡糸口金を用い、吐出量56.0g/分で溶融混練物を吐出したこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を27分、二軸押出機における最大温度を340℃に設定した上で、温度プロファイルを変更することにより、THを836に調整したこと、および孔径0.125mmφ、ランド長0.175mm、孔数20個の紡糸口金を用い、吐出量11.0g/分で溶融混練物を吐出し、吐出された20本の吐出糸状物のうち5本を分けて、巻き取り速度1000m/分で巻き取ったこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を27分、二軸押出機における最大温度を360℃に設定した上で、温度プロファイルを変更することにより、THを926に調整したこと以外は実施例6と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
液晶ポリエステル(α)のチップをΦ30mm単軸押出機(株式会社大阪精機製、「3VSE-30-32N型」)に投入し、最大温度340℃で溶融混練し、ギアポンプで計量しつつ、紡糸頭に溶融混練物を供給した。ここで、単軸押出機から紡糸頭までの滞留時間および温度プロファイルを表6に示すように設定し、THを452に調整した。
紡糸頭には孔径0.1mmφ、ランド長0.14mm、孔数100個の紡糸口金を備えており、紡糸口金から吐出量28.0g/分で溶融混練物を吐出し、巻き取り速度500m/分で巻き取ったこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
実施例1に記載の液晶ポリエステル(α)ではなく、下記式で示した各構成単位のmol比が(A)/(C)/(D)/(E)=65/10/5/20である液晶ポリエステル(β)(Mp0:348℃)を使用したこと、および滞留時間を21分、二軸押出機における最大温度を380℃に設定した上で、温度プロファイルを変更することにより、THを308に調整したこと以外は、実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
実施例1に記載の液晶ポリエステル(α)ではなく、下記式で示した各構成単位のmol比が(A)/(C)/(D)/(E)/(F)=54/15/8/16/7である液晶ポリエステル(γ)(Mp0:315℃)を使用したこと、および滞留時間を21分、二軸押出機における最大温度を360℃に設定した上で、温度プロファイルを変更することにより、THを375に調整したこと以外は、実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を11分、二軸押出機における最大温度を310℃に設定した上で、温度プロファイルを変更することにより、THを160に調整したこと、および孔径0.1mmφ、ランド長0.14mm、孔数100個の紡糸口金を用い、吐出量28.0g/分で溶融混練物を吐出し、巻き取り速度500m/分で巻き取ったこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
二軸押出機における最大温度を310℃に設定した上で、温度プロファイルを変更することにより、THを193に調整したこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を5分、二軸押出機における最大温度を310℃に設定した上で、温度プロファイルを変更することにより、THを56に調整したこと以外は実施例6と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を22分、二軸押出機における最大温度を370℃に設定した上で、温度プロファイルを変更することにより、THを1355に調整したこと、および孔径0.1mmφ、ランド長0.14mm、孔数100個の紡糸口金を用い、吐出量14.0g/分で溶融混練物を吐出し、巻き取り速度250m/分で巻き取ったこと以外は実施例1と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を11分、単軸押出機における最大温度を340℃に設定した上で、温度プロファイルを変更することにより、THを246に調整したこと以外は実施例8と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
滞留時間を23分、単軸押出機における最大温度を360℃に設定した上で、温度プロファイルを変更することにより、THを1284に調整したこと以外は比較例5と同様にして液晶ポリエステル繊維(紡糸原糸)を得た。得られた液晶ポリエステル繊維の分析結果を表7に示す。
10・・・押出機
11・・・ホッパ
12・・・バレル
13・・・スクリュ
14・・・ベント
20・・・配管
30・・・ギアポンプ
40・・・紡糸頭
41・・・ノズル
X・・・流れ方向
Claims (11)
- 全カルボキシ末端量(全CEG量)が5.0meq/kg以下であり、且つケトン結合量が0.05mol%以下である、液晶ポリエステル繊維。
- 請求項1に記載の液晶ポリエステル繊維であって、融点が380℃以下である、液晶ポリエステル繊維。
- 請求項1または2に記載の液晶ポリエステル繊維であって、強度が18cN/dtex未満である、液晶ポリエステル繊維。
- 請求項1~3のいずれか一項に記載の液晶ポリエステル繊維であって、4-ヒドロキシ安息香酸に由来する構成単位を50モル%以上有する液晶ポリエステルを含む、液晶ポリエステル繊維。
- 請求項1~4のいずれか一項に記載の液晶ポリエステル繊維であって、全片末端量が50meq/kg以上である、液晶ポリエステル繊維。
- 請求項1~5のいずれか一項に記載の液晶ポリエステル繊維を製造する方法であって、押出機内で、液晶ポリエステルを溶融混練する工程と、溶融混練物をノズルから吐出して紡糸する工程と、を少なくとも備える、液晶ポリエステル繊維の製造方法。
- 請求項6に記載の製造方法であって、溶融混練工程において、下記式(1)で表される熱履歴THが250~1100である、液晶ポリエステル繊維の製造方法。
- 請求項6または7に記載の製造方法であって、押出機が二軸押出機である、液晶ポリエステル繊維の製造方法。
- 請求項1~5のいずれか一項に記載の液晶ポリエステル繊維を少なくとも一部に含んで構成された繊維構造体。
- 請求項9に記載の繊維構造体であって、さらに強化繊維を含む、繊維構造体。
- 請求項9または10に記載の繊維構造体を、前記液晶ポリエステル繊維の融点以上で加熱して成型する、成型体の製造方法。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01280031A (ja) | 1988-05-06 | 1989-11-10 | Teijin Ltd | 複合繊維の製造方法 |
JPH0473227A (ja) | 1990-07-11 | 1992-03-09 | Toyobo Co Ltd | コンポジット用混繊糸の製造方法 |
JPH0585642B2 (ja) * | 1984-11-21 | 1993-12-08 | Sumitomo Chemical Co | |
WO2013099863A1 (ja) * | 2011-12-27 | 2013-07-04 | 東レ株式会社 | 液晶ポリエステルマルチフィラメント |
JP2013237945A (ja) | 2012-05-14 | 2013-11-28 | Asahi Kasei Fibers Corp | 複合糸条 |
WO2022113802A1 (ja) * | 2020-11-25 | 2022-06-02 | 株式会社クラレ | 液晶ポリエステル繊維およびその製造方法 |
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- 2022-09-29 WO PCT/JP2022/036593 patent/WO2023058563A1/ja active Application Filing
- 2022-09-29 KR KR1020247013123A patent/KR20240056782A/ko unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0585642B2 (ja) * | 1984-11-21 | 1993-12-08 | Sumitomo Chemical Co | |
JPH01280031A (ja) | 1988-05-06 | 1989-11-10 | Teijin Ltd | 複合繊維の製造方法 |
JPH0473227A (ja) | 1990-07-11 | 1992-03-09 | Toyobo Co Ltd | コンポジット用混繊糸の製造方法 |
WO2013099863A1 (ja) * | 2011-12-27 | 2013-07-04 | 東レ株式会社 | 液晶ポリエステルマルチフィラメント |
JP2013237945A (ja) | 2012-05-14 | 2013-11-28 | Asahi Kasei Fibers Corp | 複合糸条 |
WO2022113802A1 (ja) * | 2020-11-25 | 2022-06-02 | 株式会社クラレ | 液晶ポリエステル繊維およびその製造方法 |
Non-Patent Citations (1)
Title |
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POLYMER DEGRADATION AND STABILITY, vol. 76, 2002, pages 85 - 94 |
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