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Liquid crystal polyester, molding composition composed of liquid crystal polyester and application of molding composition

A molding composition, liquid crystal polyester technology, applied in the directions of liquid crystal materials, chemical instruments and methods, etc., can solve the problems affecting the application of liquid crystal polymers, poor melt processability and physical properties of liquid crystal products, and unsatisfactory mold filling.

Active Publication Date: 2016-08-17
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its preparation usually adopts the high-temperature melt polymerization method, but due to the self-polymerization of monomers such as HBA and HNA or the branched cross-linking reaction of the molecular chain, the melt processability and physical properties of the final liquid crystal product are poor, especially the resin The fluidity of the liquid crystal polymer is seriously affected, which leads to the mold filling dissatisfaction during the molding process of the liquid crystal polyester molding composition, which seriously affects the application of liquid crystal polymers in thin-walled parts of electronic appliances.

Method used

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  • Liquid crystal polyester, molding composition composed of liquid crystal polyester and application of molding composition
  • Liquid crystal polyester, molding composition composed of liquid crystal polyester and application of molding composition
  • Liquid crystal polyester, molding composition composed of liquid crystal polyester and application of molding composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Add the following monomer raw materials, acylating agent and catalyst to the polymerization reaction device equipped with agitator, reflux condenser, monomer feeding port, nitrogen inlet, thermometer and torque sensor.

[0074] (I) p-Hydroxybenzoic acid 911.7 g (66 mol %) HBA

[0075] (Ⅱ) 6-hydroxy-2-naphthoic acid 639.8 g (34mol%) HNA

[0076] Acylating agent: acetic anhydride 1020 g

[0077] Catalyst: Magnesium acetate 95 mg

[0078] After the feeding is completed, completely replace the atmosphere in the reaction vessel with nitrogen, raise the temperature of the reaction system to 140°C under the protection of nitrogen, and keep the nitrogen pressure at 0.2MPa, and maintain this temperature for 2 hours to carry out the acylation reaction; acylation After the reaction is over, turn on the vacuum pump to reduce the pressure in the reactor to 10KPa-30KPa, and quickly discharge acetic acid and unreacted acetic anhydride molecules from the rectification column to meet ...

Embodiment 2-5

[0079]Embodiment 2-5: After finishing according to the prescription acylation reaction of table 1, open vacuum pump and depressurize the pressure in reactor to 10KPa-30KPa, discharge acetic acid and unreacted acetic anhydride molecule rapidly from rectifying column, in order to meet rapid temperature rise According to the technical requirements, when the amount of acetic acid received reaches more than 50% of the theoretical value, the temperature is rapidly raised to 210°C, the reduced pressure condition is maintained and the temperature of the reaction system is raised to the highest temperature of 330°C within 6 hours, during which the acetic acid, especially phenol, is continuously discharged Wait for the by-product small molecules that cause molecular chain rearrangement and branching, and then reduce the pressure to 60KPa in 30 minutes; the rest are the same as in Example 1; The lengths are listed in Table 1.

Embodiment 6-12

[0081] Comparative Examples 1-3: After the feeding is completed, the atmosphere in the reaction vessel is completely replaced with nitrogen, and the temperature of the reaction system is raised to 140° C. under the protection of nitrogen, and the temperature is maintained at reflux for 2 hours to carry out the acylation reaction; the acylation reaction After the end, discharge acetic acid and unreacted acetic anhydride molecules from the rectification column, while raising the temperature and raising the temperature of the reaction system to 325°C within 6 hours, during which the acetic acid is continuously discharged, and then decompressed to 30KPa within 30 minutes; when stirring After the torque reaches the predetermined value, it is considered that the reaction is over, and the product in the reactor is taken out at this time; after the product is cooled to room temperature, it is pulverized with a pulverizer, and then heated from room temperature to 250 ° C within 10 hour...

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Abstract

The invention discloses liquid crystal polyester, a molding composition composed of the liquid crystal polyester and an application of the molding composition. The liquid crystal polyester is composed of repetitive structural units: a structural unit [I] derived from p-hydroxybenzoic acid and a structural unit [II] derived from 6-hydroxy-2-naphthoic acid; through dynamic thermal mechanical analysis DMA testing, the liquid crystal polyester meets a condition that the energy storage modulus release rate [delta]G defined by the following formula (1) is greater than or equal to 95.0% and less than or equal to 99.7%, wherein the formula (1) is [delta]G=[G(-50)-G(melting point)] / G(-50)*100%. Through differential scanning calorimetry DSC testing, the liquid crystal polyester meets a condition that the double enthalpy ratio [delta]H defined by the following formula (2) is greater than or equal to 0.05 and less than or equal to 0.9, preferably greater than or equal to 0.1 and less than or equal to 0.6, wherein the formula (2) is [delta]H=H(melting enthalpy) / H(crystallization enthalpy). The liquid crystal polyester and the molding composition prepared by the liquid crystal polyester have the advantages of relatively high liquidity, excellent melting characteristics, and high forming stability of small thin-wall molding products, and are particularly suitable for use in thin-wall electronic preparation parts.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a liquid crystal polyester, a molding composition composed of it and its application. Background technique [0002] As a high-performance special engineering plastic, thermotropic liquid crystal polymer (TLCP) has excellent mechanical properties, good fluidity, heat resistance, chemical corrosion resistance, flame retardancy and electrical insulation properties. It is currently used in electronic appliances and small It is widely used in precision thin-walled parts and other fields. Its preparation usually adopts the high-temperature melt polymerization method, but due to the self-polymerization of monomers such as HBA and HNA or the branched cross-linking reaction of the molecular chain, the melt processability and physical properties of the final liquid crystal product are poor, especially the resin The fluidity of the liquid crystal polymer is seriously affected, resulting in...

Claims

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Application Information

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IPC IPC(8): C08G63/06C08G63/80C08L67/04C08K13/04C08K7/14C09K19/38
CPCC08G63/065C08G63/80C08K7/14C08K13/04C08L2203/20C09K19/3809C08L67/04
Inventor 孙华伟李闻达肖中鹏宋彩飞罗德彬许柏荣易庆锋周广亮姜苏俊曹民曾祥斌蔡彤旻
Owner KINGFA SCI & TECH CO LTD
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