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Polyamide

A polyamide and fiber technology, applied in the direction of single-component polyamide rayon, single-component copolyamide rayon, single-component synthetic polymer rayon, etc., can solve the problem of reduced solvent solubility and difficult processing Problems with forming fibers, films, etc.

Inactive Publication Date: 2009-03-11
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a method of improving the physical properties of polymers, there is a method of cross-linking between molecules by chemical reaction, but when the polymer is cross-linked, the solubility of the polymer with respect to the solvent decreases, making it difficult to process Formed into fibers, films, etc.

Method used

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Examples

Experimental program
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Embodiment

[0081] Hereinafter, the present invention will be described in detail through examples, but the present invention is not limited by these examples.

[0082] (1) Intrinsic viscosity of polyamide

[0083] Measured at 30°C in concentrated sulfuric acid (98% by weight) solution with a concentration of 0.5g / 100mL.

[0084] (2) Concentration of end groups

[0085] It obtained by performing proton NMR analysis on the polymer spinning dope using JEOL A-600 (600 MHz).

[0086] (3) Mechanical properties of fibers

[0087] The monofilament of the obtained fiber was subjected to a tensile test using an electronic theoretical universal testing machine 1225A manufactured by Orientec Co., Ltd., and the tensile modulus and tensile strength were determined.

reference example 1

[0088] The preparation of reference example 1 polyamide (Y)

[0089] Add 2,152 parts by weight of dehydrated and purified N-methyl-2-pyrrolidone (NMP), 27.04 parts by weight of p-phenylenediamine and 50.06 parts by weight of 3,4 '-Diaminodiphenyl ether was dissolved in a nitrogen atmosphere, then it was ice-cooled, and 101.51 parts by weight of terephthalic acid dichloride was added while stirring. After that, the temperature was raised slowly, and finally reacted at 80° C. for 60 minutes. Then, 37.04 parts by weight of calcium hydroxide was added to carry out neutralization reaction to obtain a spinning dope containing polyamide (Y). In the spinning stock solution, 1,513 parts by weight of NMP were contained with respect to 100 parts by weight of polyamide (Y). A part of the spinning dope was reprecipitated with water to obtain a polyamide (Y). The intrinsic viscosity of polyamide (Y) is 3.5dL / g, and the molar ratio of (A) / (B) is 50 / 50.

Embodiment 1

[0090] Example 1 Polyamide (X) with modified end groups

[0091] Add 210 parts by weight of dehydration-purified NMP, 5.4 parts by weight of p-phenylene diamine and 10 parts by weight of 3,4'-diaminodiphenyl ether in a fully dry three-necked flask with a stirring device at normal temperature. After dissolving under a nitrogen atmosphere, it was ice-cooled, and 20.3 parts by weight of terephthalic acid dichloride and 1.46 parts by weight of 4-phenylethynylphthalic anhydride represented by the following formula (1) were added with stirring. After that, the temperature was raised slowly, and finally reacted at 80° C. for 60 minutes, and then 7.4 parts by weight of calcium hydroxide was added for neutralization reaction to obtain a spinning dope containing polyamide (X). The spinning stock solution contained 739 parts by weight of NMP based on 100 parts by weight of polyamide (X). The spinning dope was reprecipitated with water to obtain polyamide (X). The intrinsic viscosity of...

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Abstract

Disclosed are a fiber which is excellent in mechanical strength such as tensile strength and elastic modulus, and a polyamide as a raw material for such a fiber. Specifically disclosed is a polyamide (X) mainly containing repeating units represented by the formula (A) and the formula (B) shown below, and having an inherent viscosity of 0.05-20 dL / g as measured in a concentrated sulfuric acid solution at a concentration of 0.5 g / 100 mL at 30 DEG C. The polyamide (X) contains a substituent represented by the formula (C) below in at least a part of the ends. Also specifically disclosed is a fiber made of the polyamide (X). (A) (B) (C) (In the formula, Ar<3> represents a trivalent aromatic hydrocarbon group having 6-20 carbon atoms, and Ar<4> represents a monovalent aromatic hydrocarbon group having 6-20 carbon atoms.

Description

technical field [0001] The present invention relates to polyamides, resin compositions and fibers having specific end groups. Background technique [0002] Wholly aromatic polyamide has a structure in which rigid aromatic rings are connected, and is a raw material excellent in heat resistance, mechanical properties, chemical resistance, and the like. Therefore, it is widely used in electrical insulating materials, various reinforcing agents, bulletproof fibers, etc. in the form of fibers or films. Wholly aromatic polyamide is one of the raw materials with high industrial value, and it is required to have higher characteristics depending on the application it is used for. [0003] As a method of improving the physical properties of polymers, there is a method of cross-linking between molecules by chemical reaction, but when the polymer is cross-linked, the solubility of the polymer with respect to the solvent decreases, making it difficult to process Shaped into fibers, fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/48C08G69/32D01F6/60D01F6/80
CPCC08G69/48C08G69/40C08G69/32D01F6/805D01F6/60D01F6/80
Inventor 畳开真之A·P·德维杰桑原广明T·丁格曼斯
Owner TEIJIN LTD
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