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Liquid crystal polyester, liquid crystal polyester composition and products prepared from liquid crystal polyester composition

A technology of liquid crystal polyester and repeating units, applied in the liquid crystal polyester composition and its products, in the field of liquid crystal polyester, can solve the problems of increasing cost, affecting the composition, easy foaming of liquid crystal polyester, etc. Anti-foaming performance, reduced small molecule content, effect of excellent anti-foaming performance

Active Publication Date: 2019-05-14
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In existing patent literature reports, it is often used to add additives to liquid crystal polyester to prepare liquid crystal polyester composition or adjust the screw during processing to improve the technical problem that liquid crystal polyester is easy to foam during welding, but the addition of special additives Will increase the cost, affect other aspects of the composition such as mechanical properties, appearance and other related technical issues

Method used

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  • Liquid crystal polyester, liquid crystal polyester composition and products prepared from liquid crystal polyester composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Add monomer, acylating agent and catalyst to reaction kettle one equipped with stirrer, thermometer, monomer feeding port, nitrogen inlet pipe and reflux condensing device respectively. The individual weights are as follows:

[0060] 4-hydroxybenzoic acid (HBA) 8.422kg,

[0061] 2-hydroxy-6-naphthoic acid (HNA) 2.678kg,

[0062] 4,4'-Dihydroxybiphenyl (BP) 0.291kg,

[0063] 2,6-naphthalene dicarboxylic acid (NDA) 0.169kg,

[0064] Acetic anhydride (AA) 8.380kg,

[0065] Magnesium acetate 1.040g,

[0066] After feeding, put nitrogen into the reaction kettle for replacement; start stirring, and heat the reaction mixture from room temperature to 140°C in nitrogen flow, and reflux at this temperature for 2 hours; after the acetylation reaction, transfer the material to a The stirrer of the torque sensor, the nitrogen inlet, the extraction device and the vacuum device reactor two. 0.260 kg of terephthalic acid (TA) has been put into reactor two in advance, and then the...

Embodiment 2

[0069] Add monomer, acylating agent and catalyst to reaction kettle one equipped with stirrer, thermometer, monomer feeding port, nitrogen inlet pipe and reflux condensing device respectively. The individual weights are as follows:

[0070] 4-hydroxybenzoic acid (HBA) 8.422kg,

[0071] 2-hydroxy-6-naphthoic acid (HNA) 2.678kg,

[0072] 4,4'-Dihydroxybiphenyl (BP) 0.291kg,

[0073] 2,6-naphthalene dicarboxylic acid (NDA) 0.084kg,

[0074] Acetic anhydride (AA) 8.380kg,

[0075] Magnesium acetate 1.033g,

[0076] After feeding, put nitrogen into the reaction kettle for replacement; start stirring, and heat the reaction mixture from room temperature to 140°C in nitrogen flow, and reflux at this temperature for 2 hours; after the acetylation reaction, transfer the material to a The stirrer of the torque sensor, the nitrogen inlet, the extraction device and the vacuum device reactor two. 0.260 kg of terephthalic acid (TA) has been put into reactor two in advance, and then the...

Embodiment 3

[0079] Add monomer, acylating agent and catalyst to reaction kettle one equipped with stirrer, thermometer, monomer feeding port, nitrogen inlet pipe and reflux condensing device respectively. The individual weights are as follows:

[0080] 4-hydroxybenzoic acid (HBA) 8.781kg,

[0081] 2-hydroxy-6-naphthoic acid (HNA) 2.806kg,

[0082] 2,6-naphthalene dicarboxylic acid (NDA) 0.170kg,

[0083] Acetic anhydride (AA) 8.413kg,

[0084] Magnesium acetate 1.035g,

[0085] After feeding, put nitrogen into the reaction kettle for replacement; start stirring, and heat the reaction mixture from room temperature to 140°C in nitrogen flow, and reflux at this temperature for 2 hours; after the acetylation reaction, transfer the material to a The stirrer of the torque sensor, the nitrogen inlet, the extraction device and the vacuum device reactor two. The mixture was heated from 145°C to 360°C over 3.5-5.0 hours during which time the metered acetic acid recovery = 95.7%. In the polyco...

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Abstract

The invention provides a liquid crystal polyester and a liquid crystal polyester composition and products prepared from the liquid crystal polyester composition. The liquid crystal polyester comprisesaromatic-derived oxy and carbonyl repetitive units (I) and a small amount of aromatic dicarboxylic acid (IV) and can also comprise aromatic-derived dioxy repetitive units (II) and aromatic-derived dicarbonyl repetitive units (III); the composition molar ratio of the repetitive units meets the following conditions: the molar sum of the aromatic-derived oxy and carbonyl repetitive units (I), the aromatic-derived dioxy repetitive units (II) and the aromatic-derived dicarbonyl repetitive units (III) is 100 mol%, and by introducing the small amount of aromatic dicarboxylic acid into the liquid crystal polyester, the excessive molar ratio of carboxylic groups in the liquid crystal polyester is 0.1-5%, which is calculated through (carboxylic groups / hydroxyl groups) / hydroxyl groups*100 mol%. By introducing the small amount of aromatic dicarboxylic acid into preparation of the liquid crystal polyester, the prepared liquid crystal polyester can achieve excellent anti-foaming performance and good melt drainability.

Description

technical field [0001] The invention belongs to the field of special engineering plastic resins, specifically relates to the field of preparation of liquid crystal polyester resins, in particular to a liquid crystal polyester with good foam resistance, a liquid crystal polyester composition and products made thereof. Background technique [0002] Thermotropic aromatic liquid crystal polyester (TLCP) has been widely valued by research and industry. It is widely used due to its excellent mechanical properties, processing properties, thermal stability, chemical resistance, electrical insulation, and self-flammability. Used in the field of connectors. [0003] With the miniaturization, lightness and individualization of intelligent terminal equipment, as thin-walled plug-in molding materials, LCP materials are preferred due to their excellent melt fluidity, heat resistance and mechanical strength, but LCP also has its typical The performance disadvantage of the lead-free solder...

Claims

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Application Information

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IPC IPC(8): C08G63/193C08G63/06C08G63/78C08J5/18C08L67/02C08L67/04
Inventor 邢羽雄肖中鹏谢沛乐罗德彬唐钜成许伯荣宋彩飞曹民姜苏俊
Owner KINGFA SCI & TECH CO LTD
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