Liquid crystal polyester, liquid crystal polyester composition and application thereof

A technology of liquid crystal polyester and composition, applied in the field of liquid crystal polyester composition and application, liquid crystal polyester, to achieve the effects of easy crystal growth, efficient directional catalysis, and reduction of side reactions

Active Publication Date: 2021-01-22
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, by providing high melting enthalpy liquid crystal polyester formula and method, to realize the means of high heat resistance of liquid crystal polyester and composition, there is no report

Method used

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  • Liquid crystal polyester, liquid crystal polyester composition and application thereof
  • Liquid crystal polyester, liquid crystal polyester composition and application thereof
  • Liquid crystal polyester, liquid crystal polyester composition and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8 and comparative example 1-8

[0084] Examples 1-8 and Comparative Examples 1-8: Liquid crystal polyester

[0085] The raw material composition of the liquid crystal polyester of embodiment 1-8 and comparative example 1-8 is as shown in table 1, and the preparation method of liquid crystal polyester comprises the following steps:

[0086] S1. Acetylation section: add monomer, acetic anhydride and catalyst into the first reaction vessel equipped with agitator, monomer feeding port, reflux condenser, thermometer and nitrogen inlet port, and completely replace with nitrogen after feeding is completed The atmosphere in the reaction vessel, under the protection of nitrogen, the temperature of the reaction system was raised to 140 ° C, and the temperature was maintained at reflux for 2 hours to carry out the acetylation reaction;

[0087] S2. Melting polycondensation section: After the acetylation reaction is completed, the material is transferred to the second reaction vessel equipped with a stirrer equipped wit...

Embodiment 2

[0095] The results of Example 2, Example 4, Example 8 and Comparative Example 3 show that in the melt polycondensation process of liquid crystal polyester, adopting a constant temperature of 280 to 300°C for 15 to 30 minutes is beneficial to improving the melting enthalpy of liquid crystal polyester, thereby increasing the thermal Deformation temperature, and reduce foaming rate.

[0096] The results of embodiment 2, embodiment 5 and comparative example 1-2 can be known, compare comparative example 1 and adopt magnesium acetate as catalyzer, the present invention selects 1-methylimidazole acetate ionic liquid as catalyzer, and acetylation rate is high, It is more beneficial to obtain liquid crystal polyester with high melting enthalpy, high heat distortion temperature and low foaming rate. When the addition amount of the 1-methylimidazolium acetate ionic liquid is more than 500 ppm of the theoretical output weight of the liquid crystal polyester, the effect is better.

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Abstract

The invention discloses liquid crystal polyester, a liquid crystal polyester composition and an application thereof. The liquid crystal polyester comprises a repeating unit represented by the following formula (1), a repeating unit represented by the following formula (2) and a repeating unit represented by the following formula (3): (1) -O-Ar<1>-CO-; (2)-CO-Ar<2>-CO-; and (3) -O-Ar<3>-O-; whereinAr<1> is at least one of 2,6-naphthylene, 1,4-phenylene and 4,4'-biphenylene; Ar<2> is 1,4-phenylene, 1, 3 phenylene or 4, 4'-biphenylene; Ar<3> is 2,6-naphthylene, 1,4-phenylene, 1, 3-phenylene or 4,4'-biphenylene; and the melting enthalpy of the liquid crystal polyester is greater than 1.5 J/g. The liquid crystal polyester and the composition containing the liquid crystal polyester have high thermal deformation temperature, and show excellent heat resistance and foaming resistance.

Description

technical field [0001] The invention relates to the technical field of liquid crystal polymers, in particular to a liquid crystal polyester, a liquid crystal polyester composition and applications. Background technique [0002] As a high-performance special engineering plastic, liquid crystal polyester (LCP) is widely used in the fields of electronic appliances and small precision thin-walled parts. With the development of thin, light and small electronic and electrical parts, the densification of integrated circuits, especially the application of surface mount technology, puts forward higher requirements for the heat resistance of liquid crystal polyester materials. Liquid crystal polyester materials need to have different Solder temperature resistance below 260°C. [0003] In order to improve the heat resistance of liquid crystal polyester, professionals in the field have made many attempts. CN 108026258 A provides a wholly aromatic polyester containing specific structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/87C09K19/38C09K19/46C08L67/00C08K7/14C08K3/34C08K3/22
CPCC08G63/605C08G63/87C09K19/3809C09K19/46C08K7/14C08K3/34C08K3/22C08L2201/08C08K2201/004C08K2201/003C08K2003/2241C08L67/00
Inventor 邢羽雄肖中鹏黄险波叶南飚姜苏俊
Owner KINGFA SCI & TECH CO LTD
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