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Liquid crystal polyester composition

A technology of liquid crystal polyester and composition, applied in the field of polymer materials, can solve problems such as improvement and no mention of fluidity, and achieve the effects of improving fluidity and improving high temperature heat resistance stability

Inactive Publication Date: 2016-05-11
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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  • Liquid crystal polyester composition
  • Liquid crystal polyester composition
  • 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] Add the repeating units derived from aromatic hydroxycarboxylic acid, the repeating units derived from aromatic diol and the repeating units derived from aromatic Repeating unit of carboxylic acid, and add a certain proportion of acetic anhydride as acylating agent; then pass nitrogen into the reaction kettle 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 side reactions are evaporated Product acetic acid; In the final polycondensation stage, the reaction system is decompressed, and judged by observing that the torque rises as the end point of the reaction; at this time, the prepolymer in the melt state is discharged through 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, the obtained liquid crystal polyester, fibrous filler, 4-hydroxyacetophenone and / or various additives prepared by Examples A1-A4 are uniformly mixed with a high-speed mixer, and then added to a twin-screw extruder, Melt and mix at the screw speed of 280RPM-320RPM, the temperature of the screw barrel is 290°C-355°C, extrude, cool, and pelletize 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.

[0071] Table 2

[0072]

[0073] Continued Table 2

[0074]

[0075] Example 1 from Table 2 - 12 and comparative example 1 - 6. It can be seen from the comparison of 6 that the liquid crystal polyester composition obtained by selecting the content of 4-hydroxyacetop...

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Abstract

The invention discloses a liquid crystal polyester composition. The composition comprises, by weight, 100 parts of liquid crystal polyester and 5-100 parts of a fibrous filler, and the content of 4-hydroxyacetophenone in the liquid crystal polyester composition is 0.5-550ppm. 0.5-550Ppm of 4-hydroxyacetophenone is added to the liquid crystal polyester composition, so the high temperature resisting stability of the obtained liquid crystal polyester composition is unexpectedly substantially improved, and the fluidity is also improved without influencing other performances of the liquid crystal polyester composition.

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): C08L67/03C08K7/14C08K5/132
CPCC08K5/132C08K7/14C08L67/03C08L2201/08
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