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Liquid crystal polyester and liquid crystal polyester composition consisting of same

A technology of liquid crystal polyester and composition, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of improving, narrowing the scope of use, and not mentioning the fluidity of the composition, so as to achieve excellent high temperature heat resistance stability, flow Improved performance and improved high-temperature heat resistance stability

Inactive Publication Date: 2016-05-04
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid crystal composition obtained by this method contains metal residues, which will inevitably affect the dielectric properties of the liquid crystal resin as electronic and electrical parts, and narrow its application range
On the other hand, the patent does not mention whether the fluidity of the composition is improved
[0007] So far, there is no report about the impact of adding 4-hydroxyacetophenone on the fluidity and high temperature heat resistance stability of the liquid crystal polyester in the liquid crystal polyester

Method used

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  • Liquid crystal polyester and liquid crystal polyester composition consisting of same
  • Liquid crystal polyester and liquid crystal polyester composition consisting of same
  • Liquid crystal polyester and liquid crystal polyester composition consisting of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-12 and comparative example 1-6

[0071] Embodiment 1-12 and comparative example 1-6: the preparation of liquid crystal polyester

[0072] Add the repeating units derived from aromatic hydroxycarboxylic acid, the repeating units derived from aromatic diol and the repeating units derived from aromatic The repeating unit of carboxylic acid, and add a certain proportion of acetic anhydride as an acylating agent, and add 4-hydroxyacetophenone based on the total weight of liquid crystal polyester at 0.1ppm-500ppm at the same time; then pass nitrogen into the reactor for replacement; start Stir and heat the reaction mixture from room temperature to 140°C-160°C in a nitrogen stream, and reflux at this temperature for 1 hour to 3 hours; then continue to heat up, and heat the mixture from 140°C to 160°C over 2 hours to 4 hours 300°C-350°C, during this process, unreacted acetic anhydride and by-reaction product acetic acid are evaporated; in the final polycondensation stage, the reaction system is decompressed, and th...

Embodiment 13-24 and comparative example 7-9

[0077] Examples 13-24 and Comparative Examples 7-9: Preparation of Liquid Crystal Polyester Composition

[0078]According to the ratio in Table 2, the liquid crystal polyester, filler and / or various additives prepared in Examples 1-12 are uniformly mixed with a high-speed mixer, then added to a twin-screw extruder, and melted at a screw speed of 280RPM-320RPM Mixing, the temperature of the screw barrel is 290°C-355°C, extruding, cooling, and pelletizing to obtain the liquid crystal polyester composition. The melting point, flow length, melt viscosity and specific logarithmic viscosity of the obtained liquid crystal polyester composition are listed in Table 2.

[0079] Table 2

[0080]

[0081] Example 1 from Table 1 - 12 and comparative example 1 - It can be seen from the comparison of 6 that when the present invention selects the content of adding 4-hydroxyacetophenone in the liquid crystal polyester formula to be 0.1ppm-500ppm based on the total weight of the liquid ...

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Abstract

The invention discloses liquid crystal polyester. Based on total weight of the liquid crystal polyester, the weight content of 4-hydroxyacetophenone is 0.1-500ppm. The invention also discloses a liquid crystal polyester composition comprising the liquid crystal polyester. When the weight content of the 4-hydroxyacetophenone added into the liquid crystal polyester formula is 0.1-500ppm based on total weight of the liquid crystal polyester, the high-temperature heatproof stability of the obtained liquid crystal polyester is remarkably improved while the fluidity is also increased; and moreover, the liquid crystal polyester composition consisting of the liquid crystal polyester also has excellent high-temperature heatproof stability and fluidity.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a liquid crystal polyester and a liquid crystal polyester composition composed of it. Background technique [0002] As a special engineering material, liquid crystal polyester (LCP) has a higher melting point and high heat resistance stability than general-purpose resins. However, liquid crystal polyester still suffers from thermal decomposition during processing at high temperatures or due to external forces The molecular chain is broken due to thermal shearing, resulting in a decrease in performance in all aspects. In order to improve the heat resistance stability of liquid crystal polyester, many attempts have been made by professionals in the field. [0003] For example, CN1234749 discloses a liquid crystal polyester, which contains repeating units from 4-hydroxyisophthalic acid and / or salicylic acid as a copolymerization component, and contains 10-5000ppm of alkali metal co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/06C08G63/78C08L67/00C08L67/04C09K19/38
CPCC08G63/605C08G63/065C08G63/78C08L67/00C08L67/04C09K19/3809
Inventor 李闻达孙华伟肖中鹏王鹏罗德彬许柏荣易庆锋周广亮曹民姜苏俊
Owner KINGFA SCI & TECH CO LTD
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