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Liquid crystal polyester, liquid crystal polyester composition and products made thereof

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, easy foaming of liquid crystal polyester, affecting the composition, etc. Polymerization speed, excellent anti-foaming properties, the effect of reducing the content of small molecules

Active Publication Date: 2022-01-11
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 made thereof

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, a liquid crystal polyester composition and products made thereof. In the liquid crystal polyester provided by the present invention, it must contain repeating units derived from aromatic oxycarbonyl (I) and a small amount of aromatic dicarboxylic acid (IV), and may also contain repeating units derived from aromatic dioxy (II) and a repeating unit (III) derived from an aromatic dicarbonyl group; the molar ratio of the repeating unit composition satisfies the following conditions: the repeating unit (I) derived from an aromatic oxycarbonyl group, the repeating unit (II) derived from an aromatic dioxyl group ) and the repeating unit (III) derived from the aromatic dicarbonyl group and the sum of the three are 100mol%, wherein a small amount of aromatic dicarboxylic acid is introduced in the liquid crystal polyester, so that the excessive molar ratio of carboxyl groups in the liquid crystal polyester is 0.1- 5%, which is calculated by (carboxyl group-hydroxyl group) / hydroxyl group×100mol%; in the present invention, a small amount of excess aromatic dicarboxylic acid is introduced into the liquid crystal polyester preparation process, and the liquid crystal polyester prepared Has excellent anti-foaming properties and good melt discharge.

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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Patent Type & Authority Patents(China)
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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