High-fluidity wholly aromatic liquid crystal polyester and preparation method thereof

A liquid crystal polyester and wholly aromatic technology, which is applied in the field of high fluidity wholly aromatic liquid crystal polyester and its preparation, can solve problems such as increased melt viscosity, difference in molecular weight of liquid crystal polyester, failure to fill, etc., to achieve fluidity Stable performance, high fluidity and uniform quality

Inactive Publication Date: 2020-04-03
JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the physical properties of high-molecular polymers will increase with the increase of molecular weight, their melt viscosity will also increase. If the melt viscosity is too high, there will be difficulties in post-processing and molding, especially when some thin-walled products are injection-molded. fill up, gap
In order to obtain high-performance thermotropic liquid crystal polyester and ensure good melt fluidity of thermotropic liquid crystal polyester in the industry, it is necessary to strictly control the conditions during solid phase thickening, but because the solid phase thickening time is long, Factors such as temperature and vacuum degree have a great influence on the effect of solid-phase thickening. There are differences in the molecular weight of different batches of liquid crystal polyester, and the fluidity of different batches cannot be consistent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 2760g (20mol) p-hydroxybenzoic acid in the reactor that stirring device, thermometer and reflux condenser are installed, 1860g (10mol) 4,4-diphenol, 415g (2.5mol) isophthalic acid, 1245g ( 7.5 mol) terephthalic acid, 4284 g (42 mol) acetic anhydride, 5.28 g (0.04 mol) potassium phenate, after purging and replacing the air in the reactor with nitrogen, heat up to 140° C. for 2 hours to carry out the acetylation reaction. Then the temperature was raised to 340°C, during which the by-product acetic acid and unreacted acetic anhydride produced by the polymerization were discharged in time, and finally the vacuum was evacuated to 133Pa, and the vacuum was stopped until the stirring torque increased, and the material was pressed and discharged with nitrogen to obtain a prepolymer. The prepared prepolymer was crushed, solid-phase thickened under vacuum conditions, and kept at 240° C. for 18 hours to obtain a high-fluidity wholly aromatic liquid crystal polyester.

Embodiment 2

[0043] Add 2760g (20mol) p-hydroxybenzoic acid, 1880g (10mol) 2-hydroxyl-6-naphthoic acid, 4284g (42mol) acetic anhydride, 23.2g (0.2mol) in the reactor that stirrer, thermometer and reflux condenser are installed ) sodium phenate, after purging and displacing the air in the reactor with nitrogen, the temperature was raised to 140° C. for 2 hours to carry out the acetylation reaction. Then the temperature was raised to 340°C, during which the by-product acetic acid and unreacted acetic anhydride produced by the polymerization were discharged in time, and finally the vacuum was evacuated to 133Pa, and the vacuum was stopped until the stirring torque increased, and the material was pressed and discharged with nitrogen to obtain a prepolymer. The prepared prepolymer was crushed, solid-phase thickened under vacuum conditions, and kept at 250° C. for 8 hours to obtain a high-fluidity wholly aromatic liquid crystal polyester.

Embodiment 3

[0045] Add 3105g (22.5mol) p-hydroxybenzoic acid, 470g (2.5mol) 2-hydroxyl-6-naphthoic acid, 2325g (12.5mol) 4,4-linked Hydroquinone, 415g (2.5mol) isophthalic acid, 1660g (10mol) terephthalic acid, 5355g (52.5mol) acetic anhydride, 52.8g (0.4mol) potassium phenate, after nitrogen purging replaces the air in the reactor, Raise the temperature to 140° C. and keep it warm for 2 hours to carry out the acetylation reaction. Then the temperature was raised to 340°C, during which the by-product acetic acid and unreacted acetic anhydride produced by the polymerization were discharged in time, and finally the vacuum was evacuated to 133Pa, and the vacuum was stopped until the stirring torque increased, and the material was pressed and discharged with nitrogen to obtain a prepolymer. The prepared prepolymer was crushed, solid-phase thickened under vacuum conditions, and kept at 260° C. for 18 hours to obtain a high-fluidity wholly aromatic liquid crystal polyester.

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PUM

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Abstract

The invention belongs to the field of materials, and discloses a high-fluidity wholly aromatic liquid crystal polyester which is mainly obtained by reaction of a monomer, fatty acid anhydride and an end-capping reagent, and the monomer comprises at least one of HO-Ar-COOH (I), HO-Ar-OH (II) and HOOC-Ar-COOH (III); wherein Ar is at least one of phenyl, biphenyl, naphthyl, anthryl or phenanthryl. Byintroducing the end-capping reagent, the molecular weight of the liquid crystal polyester is effectively controlled, so that the synthesized liquid crystal polyester is high in fluidity and good in stability, and later processing and forming are facilitated; by effectively controlling the molecular weight, the liquid crystal polyesters of different batches are equivalent in molecular weight, stable in flowability and uniform in quality.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a high-fluidity wholly aromatic liquid crystal polyester and a preparation method thereof. Background technique [0002] Thermotropic liquid crystal polyesters have excellent properties such as high fluidity, high heat resistance, low shrinkage, and low dielectric properties. At present, most thermotropic liquid crystal polyesters are used in the electronic and electrical industries. With the refined development of the electronic and electrical industry, thermotropic liquid crystal polyester products are becoming more and more refined, especially some thin-walled products have higher requirements for the fluidity of thermotropic liquid crystal polyester. [0003] In the industrial production of thermotropic liquid crystal polyester, aromatic hydroxycarboxylic acid, aromatic diphenol, and aromatic dibasic acid are usually acetylated by fatty acid anhydride, then heated to poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C09K19/38
CPCC08G63/60C09K19/3809
Inventor 曾建平金良文梁咏华郑红专梁洪辉
Owner JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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