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Method for improving molecular weight of thermotropic liquid crystal polymer

A technology of liquid crystal polymers and thermotropic liquid crystals, applied in liquid crystal materials, chemical instruments and methods, etc., to achieve the effects of chemical corrosion resistance, high dimensional precision, and low linear expansion coefficient

Inactive Publication Date: 2014-05-21
NANTONG HAIDI CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although people have thought of many ways to improve the molecular weight of the polymerization product, such as adopting the solid phase polymerization method (CN200410054025, CN200410054024), this method takes a long time, and consumes energy, and is not suitable for large-scale production

Method used

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  • Method for improving molecular weight of thermotropic liquid crystal polymer
  • Method for improving molecular weight of thermotropic liquid crystal polymer
  • Method for improving molecular weight of thermotropic liquid crystal polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1.344mol of p-hydroxybenzoic acid, 0.336mol of 6-hydroxy-2-naphthoic acid, 0.36mol of hydroquinone and 0.36mol of terephthalic acid into a 1L stainless steel reactor, add 2.88mol of acetic anhydride and 0.01mol of potassium acetate . After passing nitrogen for 30 min, set the nitrogen flow rate to 20 mL / min. Heat to reflux for 1h, then increase the temperature, at 200 o C kettle temperature reaction 1h, emit by-product acetic acid and excess acetic anhydride. with 1 o C / min increase the reaction temperature to 300 o C, react at this temperature until no acetic acid is distilled off, with 10 o C / min increase the reaction temperature to 340 o C, evacuate to a vacuum degree of 50 Pa, continue to evacuate for 30 minutes, record the motor torque, release the vacuum with nitrogen, stop heating, and end the reaction.

Embodiment 2-11

[0022] Embodiment 2-11 synthetic method with reference to embodiment 1, the amount of p-hydroxybenzoic acid, 6-hydroxyl-2-naphthoic acid and terephthalic acid is constant, and the amount of hydroquinone is respectively 1.005, 1.010, 1.015, 1.020, 1.025, 1.030, 1.035, 1.040, 1.045, 1.050 times.

Embodiment 12

[0024] Add 1.344mol p-acetoxybenzoic acid, 0.336mol 6-acetoxy-2-naphthoic acid, 0.36mol hydroquinone diacetate, 0.36mol terephthalic acid and 0.01mol potassium acetate to 1L stainless steel for reaction in the cauldron. After passing nitrogen for 30 min, set the nitrogen flow rate to 20 mL / min. Heat up to 200 o C kettle temperature reaction 1h, release the by-product acetic acid. with 1 o C / min increase the reaction temperature to 300 o C, react at this temperature until no acetic acid is distilled off, with 10 o C / min increase the reaction temperature to 340 o C, evacuate to a vacuum degree of 50 Pa, continue to evacuate for 30 minutes, record the motor torque, release the vacuum with nitrogen, stop heating, and end the reaction.

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Abstract

The invention provides a method for improving the molecular weight of a thermotropic liquid crystal polymer. According to the method, in the process of preparing the thermotropic liquid crystal polymer by using p-hydroxybenzoic acid / p-acetoxybenzoic acid, 6-hydroxy-2-naphthoic acid / 6-acetoxy-2-naphthoic acid, hydroquinone / hydroquinone diacetate and terephthalic acid, the molar ratio of the hydroquinone / hydroquinone diacetate to the terephthalic acid is controlled to be (1.005-1.025): 1. The molecular weight of the polymer product is controlled by controlling the addition amount of certain monomers, so that the polymerization time can be greatly shortened and the production efficiency is improved.

Description

Technical field: [0001] The invention relates to a method for increasing the molecular weight of a thermotropic liquid crystal polymer, which belongs to the technical field of organic chemistry. Background technique: [0002] Thermotropic liquid crystal polymer (TLCP) is a new type of ultra-high performance polymer material developed rapidly in the past ten years. It has high strength, high modulus, high temperature resistance, low moisture absorption, good dielectric properties, and high Flame retardancy, chemical corrosion resistance, microwave transparency, good radiation resistance and vibration absorption; at the same time, it also has excellent fluidity and processing performance, low linear expansion coefficient, high dimensional precision and stable size Good performance and a series of excellent comprehensive properties. It can be used as self-reinforced engineering plastics, high-performance fibers, plates, films, and optical fiber coatings, etc., and is widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/78C09K19/38
Inventor 倪海平周勰钱岳张东宝
Owner NANTONG HAIDI CHEM
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