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Method for producing wholly aromatic liquid crystalline polyester fibers having improved spinning properties

A liquid crystal polyester and all-aromatic technology, which is applied in the manufacture of rayon, one-component polyester rayon, and one-component copolyester rayon, etc., can solve the problem of resin spinnability decline and polymerization degree insufficiency Improvement of spinnability and properties

Active Publication Date: 2020-08-07
世洋树脂株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the case of the product manufactured in the cited patent, there is a problem that the degree of polymerization cannot be raised to a sufficient level, and the melting point is lowered at high temperature and the spinnability of the resin is lowered, so it is actually used as a fiber there is a problem
In contrast, in the case of spinning with a small laboratory spinner, partial spinning can be performed, but in the case of spinning with a mass-production level spinner, normal spinning cannot be performed, so Difficult to achieve substantive commercialization

Method used

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  • Method for producing wholly aromatic liquid crystalline polyester fibers having improved spinning properties
  • Method for producing wholly aromatic liquid crystalline polyester fibers having improved spinning properties
  • Method for producing wholly aromatic liquid crystalline polyester fibers having improved spinning properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087]15,000 g (146.9 moles) of acetic anhydride were charged into a 200 L capacity batch reactor, and 20,000 g (144.8 moles) of monomer p-hydroxybenzoic acid (HBA), 2,100 g (11.1 moles) of p-hydroxybenzoic acid (HBA), 2,100 g (11.1 moles) of ) of 6-hydroxy-2-naphthoic acid (HNA), 6,220g (33.4 moles) of bisphenol (BP), 3,700g (22.3 moles) of high-purity terephthalic acid (PTA), 1,850g (11.1 moles) After the high-purity isophthalic acid (PIA) was added, 10,000 g (98 moles) of acetic anhydride was further added and they were thoroughly mixed in the batch reactor. Subsequently, 2.6 g of potassium acetate catalyst and 10.3 g of magnesium acetate catalyst were added. Subsequently, after making the internal space of the reactor inert, the temperature of the reactor was raised to the temperature at which the acetic anhydride inside the batch reactor was refluxed over 1 hour, and during the reflux at this temperature, the acetic anhydride was used Acetylation of the hydroxyl groups o...

Embodiment 2

[0090] A wholly aromatic liquid crystal polyester resin for fibers was produced by the same method as in Example 1 above except that the total amount of acetic anhydride charged was 24,560 g (240.59 mol). The melting point of the manufactured resin is 544poise.

[0091] In addition, as a result of spinning by the same method as in Example 1, although some filaments were broken during spinning, the entanglement property was good when the winding speed was lowered. The obtained As-spun fiber was heat-treated by the same method as in Example 1, and its properties were evaluated.

Embodiment 3

[0093] A wholly aromatic liquid crystal polyester resin for fibers was produced by the same method as in Example 1 above except that the total amount of acetic anhydride charged was 25,470 g (249.50 mol). The melting point of the manufactured resin is 953poise.

[0094] In addition, as a result of spinning by the same method as in Example 1, no yarn breakage occurred during spinning and the entanglement property was good. The obtained As-spun fiber was heat-treated by the same method as in Example 1, and its properties were evaluated.

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Abstract

The present invention relates to a method for producing wholly aromatic liquid crystalline polyester fibers having improved spinning properties, and more specifically, to a method for producing whollyaromatic liquid crystalline polyester fibers by pelletizing a resin and melt spinning the resin under an oil condition in which 0.5-2% of a coning oil and 0.5-2% of a high-temperature silicone spin finish oil are mixed using water as a solvent, wherein the resin is produced by adding 0.08-1.12 equivalent weights of acetic anhydride to raw material monomers comprising hydroxy benzoic acid, hydroxynaphthoic acid, bi-phenol, terephthalic acid, and isophthalic acid, and subjecting same to solid state polycondensation.

Description

technical field [0001] The present invention relates to a method for producing wholly aromatic liquid crystal polyester fibers, and more specifically, a raw material monomer comprising hydroxybenzoic acid, hydroxynaphthoic acid, bisphenol, terephthalic acid and isophthalic acid is mixed with 1.08 to 1.12 equivalents A method for producing wholly aromatic liquid crystal polyester fibers produced by polycondensation of acetic anhydride. Background technique [0002] The wholly aromatic liquid crystal polyester resin has the characteristics that its molecules are rigid, and it forms a liquid crystal state without intermolecular entanglement even in a molten state, and has the ability to orient the molecular chains by shearing force at the time of molding. Behavior in the direction of flow. The wholly aromatic liquid crystal polyester resin has high strength, high elastic modulus, high heat resistance, and low expansion coefficient due to the structure composed of layers includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/62D01F1/10D01D5/08D01D10/02
CPCD01F6/84D01D10/02D01D5/08D01D5/096C08G63/605C08G63/80D01F1/10D01F6/62C08G63/183C08G63/195C08G2250/00
Inventor 張廯化河泰暎金成垠李玧應
Owner 世洋树脂株式会社
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