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LCP (liquid crystal polyester) composition

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 fluidity and improvement not mentioned, and achieve the effect of improving high temperature heat resistance stability and fluidity

Inactive Publication Date: 2016-05-18
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the patent does not mention whether its fluidity has improved
[0005] 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 composition in the liquid crystal polyester composition

Method used

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  • LCP (liquid crystal polyester) composition
  • LCP (liquid crystal polyester) composition
  • LCP (liquid crystal polyester) composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1-A4

[0065] Embodiment A1-A4: the preparation of liquid crystal polyester

[0066] In the reaction kettle equipped with a stirrer, a thermometer, a nitrogen inlet pipe and a reflux condensing device, respectively add repeating units derived from aromatic hydroxycarboxylic acids, repeating units derived from aromatic diols and aromatic The repeating unit of dicarboxylic acid, and add a certain proportion of acetic anhydride as an acylating agent; then pass nitrogen into the reactor for replacement; start stirring, and heat the reaction mixture from room temperature to 140°C-160°C in nitrogen flow, 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 to 300°C to 350°C over 2 hours to 4 hours, during which unreacted acetic anhydride and by-products are distilled off. Reaction product acetic acid; In the final polycondensation stage, the reaction system is decompressed, and judged by observing that the torque rises as the ...

Embodiment 1-12 and comparative example 1-6

[0069] Examples 1-12 and Comparative Examples 1-6: Preparation of Liquid Crystal Polyester Composition

[0070] According to the proportioning of Table 2, after the liquid crystal polyester, filler, 4-hydroxyacetophenone and / or various additives prepared by the examples A1-A4 are mixed uniformly with a high-speed mixer, they are added to a twin-screw extruder at 280RPM Melting and mixing at a screw speed of -320RPM, the temperature of the screw barrel is 290°C-355°C, extruding, cooling, and pelletizing to obtain a 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.

[0071] Table 2

[0072]

[0073] Continued Table 2

[0074]

[0075] From the comparison of Examples 1-12 and Comparative Examples 1-6 in Table 2, it can be seen that the present invention adds 4-hydroxyacetophenone based on the total amount of liquid crystal polye...

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Abstract

The invention discloses LCP (liquid crystal polyester) composition. The content of 4-hydroxyacetophenone by weight is 0.1-500 ppm on the basis of the total weight of the LCP composition. When the content of 4-hydroxyacetophenone added to an LCP composition formula is 0.1-500 ppm on the basis of the total weight of the LCP composition, the high-temperature heat-resistant stability of the obtained LCP composition is significantly improved unexpectedly, and the liquidity is also improved.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a liquid crystal polyester composition. 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] US5397502 discloses a liquid crystal polymer composition with improved heat resistance stability, the composition contains 15~3000ppm of alkali metal or 50~3000ppm of magnesium or calcium; the liquid crystal polymer contains p-hydroxybenzoic acid, hydroquinone, bisp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/03C08K5/132C08K3/34C08G63/60C08G63/06C09K19/38
CPCC08G63/60C08K3/34C08K5/132C08L67/03C08G63/065C08G63/605C08K2201/003C08L2201/08C09K19/3809C08L67/04
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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