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Liquid crystal polyester composition

A technology of liquid crystal polyester and composition, applied in liquid crystal materials, chemical instruments and methods, etc.

Inactive Publication Date: 2016-07-27
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there is no report about the effect of adding metal tin element in the liquid crystal polyester composition on the high temperature heat resistance stability of 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

[0083] Embodiment A1-A4: the preparation of liquid crystal polyester

[0084] 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 di...

Embodiment 1-17 and comparative example 1-6

[0087] Examples 1-17 and Comparative Examples 1-6: Preparation of Liquid Crystal Polyester Composition

[0088] According to the proportioning in Table 2, the obtained liquid crystal polyester, filler, tin-containing compound and / or barium-containing compound and / or chromium-containing compound, and / or various additives prepared by Examples A1-A4 are uniformly mixed with a high-speed mixer , into a twin-screw extruder, melted and mixed at a screw speed of 280RPM-320RPM, and the temperature of the screw barrel is 290°C-355°C, extruded, cooled, and pelletized to obtain a liquid crystal polyester composition. The melting point, melt viscosity and specific logarithmic viscosity of gained liquid crystalline polyester composition are listed in Table 2;

[0089] Wherein, the content of metal tin element, metal barium element and metal chromium element in the liquid crystal polyester composition is determined by the actual addition amount of tin-containing compound, barium-containing ...

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Abstract

The invention discloses liquid crystal polyester composition. The weight content of metal tin elements is 0.1 ppm-500 ppm in terms of the total weight of the liquid crystal polyester composition. A method for testing the weight content of the metal tin elements comprises steps as follows: the liquid crystal polyester composition is dried at the temperature of 120 DEG C for 4 hours, 1 g of a to-be-treated sample is taken and mixed with nitric acid and hydrogen peroxide, the mixture is heated for 2 hours, and meanwhile, nitric acid and hydrogen peroxide are added constantly; after the sample is dissolved, the dissolved sample is taken, and the weight content of the metal tin elements in the sample is analyzed with a full-automatic inductive coupled plasma atomic emission spectrometer in the model of 720ES in the Agilent company. When the weight content of the metal tin elements added in the formula of the liquid crystal polyester composition reaches 0.1 ppm-500 ppm in terms of the total weight of the liquid crystal polyester composition, the high-temperature heat-resistant stability of the liquid crystal polyester composition is unexpectedly remarkably 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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IPC IPC(8): C08G63/60C08L67/00C08K7/14C08K3/22C08K5/098C08K3/16C08K5/57C09K19/38
CPCC08G63/605C08K3/16C08K3/22C08K5/098C08K5/57C08K7/14C08K2003/2231C09K19/3809C08L67/00
Inventor 李闻达孙华伟肖中鹏曹民罗德彬许柏荣周广亮姜苏俊曾祥斌黄险波
Owner KINGFA SCI & TECH CO LTD
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