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Liquid crystal polyester composition

A technology of liquid crystal polyester and composition, applied in the field of polymer materials

Inactive Publication Date: 2016-07-06
ZHUHAI WANTONG SPECIAL ENG PLASTICS 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 titanium element in the liquid crystal polyester composition on the tensile strength and 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

[0075] Embodiment A1-A4: the preparation of liquid crystal polyester

[0076] 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 1-14 and comparative example 1-6

[0079] Examples 1-14 and Comparative Examples 1-6: Preparation of Liquid Crystal Polyester Composition

[0080] According to the ratio in Table 2, the liquid crystal polyester, filler, titanium-containing compound and / or sodium-containing compound, and / or various additives prepared by the examples A1-A4 are uniformly mixed with a high-speed mixer, and then added to the twin-screw extruder machine, 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, tensile strength and HDT of gained liquid crystalline polyester composition are listed in Table 2;

[0081] Wherein, the content of metal titanium element and metal sodium element in the liquid crystal polyester composition is adjusted and measured by the actual addition amount of titanium-containing compound and sodium-containing compound during the preparation process of the liquid c...

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PUM

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Abstract

The invention discloses a liquid crystal polyester composition. Based on the total weight of the liquid crystal polyester composition, the weight content of metal titanium element is 1ppm-800ppm. The test method for the weight content of the metal titanium element: dry the liquid crystal polyester composition at 120° C. for 4 hours, take 1 g of the sample to be treated, add nitric acid and hydrogen peroxide, and heat for 2 hours, during which nitric acid and hydrogen peroxide are continuously added; the digestion of the sample After completion, remove the sample after solution, and analyze the weight content of metal titanium element in the sample by using a fully automatic inductively coupled plasma atomic emission spectrometer (model 720ES from Agilent). In the present invention, when the weight content of metal titanium element added in the formula of the liquid crystal polyester composition is 1ppm-800ppm based on the total weight of the liquid crystal polyester composition, the tensile strength of the obtained liquid crystal polyester composition is significantly improved, and the high temperature The thermal stability was unexpectedly significantly 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): C08L67/04C08K7/14C08K3/22C08K3/24C08K5/10C08K5/098C08G63/60C09K19/38
CPCC08K7/14C08G63/605C08K3/22C08K3/24C08K5/098C08K5/10C08K2003/2241C08K2201/003C08K2201/004C08L2201/08C09K19/3809C08L67/04
Inventor 李闻达肖中鹏孙华伟曹民罗德彬许柏荣周广亮姜苏俊曾祥斌黄险波
Owner ZHUHAI WANTONG SPECIAL ENG PLASTICS CO LTD
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