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Uses of ionic liquid as catalyst in preparation of liquid crystal polyester, and liquid crystal polyester preparation method

An ionic liquid and liquid crystal polyester technology, applied in the polymer field, can solve the problems of catalyst deactivation, complicated post-processing, and difficult recycling of ionic liquid solutions, and achieves reduced solution viscosity, excellent stability, and efficient directional catalytic performance. Effect

Active Publication Date: 2018-07-13
KINGFA SCI & TECH CO LTD +1
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  • Abstract
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Problems solved by technology

However, due to the influence of water in the solution and other problems in solution polymerization, it is easy to cause proble

Method used

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Examples

Experimental program
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Effect test

Example

[0048] Examples 1-10 and Comparative Examples 1-7:

[0049] The preparation method of liquid crystal polyester: Into a polymerization reaction device equipped with a stirrer, a reflux condenser, a monomer feed port, a nitrogen inlet, a thermometer and a torque sensor, the monomer raw materials, acetic anhydride, catalyst. After the feeding is completed, the atmosphere in the reaction vessel is completely replaced with nitrogen, the temperature of the reaction system is increased to 150°C under the protection of nitrogen, and the temperature is maintained at this temperature and refluxed for 3 hours for the acylation reaction; after the acylation reaction is completed, the reaction system The temperature is increased to 360°C within 8 hours, while the by-product acetic acid and unreacted acetic anhydride are evaporated, and then the pressure is reduced to about 30kPa within 60 minutes, and the reaction generated acetic acid, unreacted fatty acid anhydride and other low boiling poi...

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Abstract

The invention discloses uses of an ionic liquid as a catalyst in preparation of liquid crystal polyesters, particularly performing of a polymerization monomer acylation reaction step and/or a meltingcondensation polymerization reaction step after acylation in liquid crystal polyester preparation reaction steps under the catalysis of an ionic liquid, wherein the ionic liquid is obtained by carrying out a reaction on a heterocyclic organic alkali compound containing two or more nitrogen atoms and an anionic functional compound, and the adding amount of the ionic liquid is 5-2000 ppm based on the total amount of all the added polymerization monomer. According to the present invention, the ionic liquid catalyst has advantages of efficient directional catalytic property, obvious catalytic effect and reduced side reaction of polymerization; the ionic liquid has advantages of excellent stability and long-lasting catalytic effect; the prepared ionic liquid can be directly added to the acylation and transesterification reaction system without purification, such that the operation is simple; and the liquid crystal polyester resin prepared under the catalysis of the ionic liquid catalyst hasexcellent tensile strength and excellent notched impact strength.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to the use of ionic liquids as catalysts in the preparation of liquid crystal polyesters and a method for preparing liquid crystal polyesters. Background technique [0002] Thermotropic liquid crystal polyester (TLCP) has excellent mechanical properties, processing properties, high dimensional stability, high and low temperature resistance, chemical corrosion resistance, self-reinforcing self-flame retardancy and electrical insulation properties, and is currently used in electronic and electrical components and other fields widely. [0003] The known preparation method of liquid crystal polyester is generally divided into two steps. First, under the action of a catalyst, the polymerized monomer is used to acylate the aromatic hydroxyl compound with an acylating agent to improve the reactivity of the hydroxyl group, and then react with the aromatic carboxyl group. Under the action ...

Claims

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Application Information

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IPC IPC(8): C08G63/87C08G63/193C08G63/183C08G63/181
CPCC08G63/181C08G63/183C08G63/193C08G63/87
Inventor 肖中鹏孙华伟曹民周广亮姜苏俊许柏荣罗德彬邢羽雄宋彩飞
Owner KINGFA SCI & TECH CO LTD
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