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Liquid crystal polymer as well as preparation method and application thereof

A liquid crystal polymer and polyphenylene ether technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of high monomer price, difficult processing, and high product cost, and achieve low melting point, high dielectric constant, and low production cost. Reduced effect

Pending Publication Date: 2021-11-23
上海孛柯博科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its melting point has decreased and its melting point range has widened, the melting point of polymers is generally above 315°C, and processing is still relatively difficult. In addition, the price of monomers is high, and the cost of products is relatively high.

Method used

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  • Liquid crystal polymer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This example is the preparation of dihydroxy low molecular weight polyphenylene ether.

[0048] Prepare a 5L glass jacketed reactor, equipped with turbine stirring, O 2 The pipeline goes deep from the top of the kettle, the outlet is set under the stirring paddle, and the top of the reactor is set with N 2 Purge lines and condenser.

[0049] Add 2100 g of toluene, 20 g of tetramethylpropylenediamine, 38 g of dimethylbutylamine, and 12 g of cuprous oxide hydrogen bromide solution. Start stirring, feed cooling water into the reactor jacket, control the reaction liquid at 20°C, feed oxygen at 1.4L / min, use a metering pump to mix 2,6-dimethylphenol 700g, tetramethylbisphenol F A solution of 96g and 700g of toluene was continuously and uniformly added to the reactor, the reaction temperature was controlled at 25-30°C, and the reaction time was 80min.

[0050] After the reaction was completed, 200 ml of 2% EDTA-3K solution was added to the reaction solution, the temperatur...

Embodiment 2

[0053] This example is the synthesis of liquid crystal copolymer.

[0054] 2.5L jacketed stirring reactor, the top of the reactor is connected with a separation column, and the separation column is equipped with random packing. Since the acetylation temperature is 120-150°C, and the boiling point of acetic anhydride is 131.6°C, in order to avoid the waste of unreacted acetic anhydride in the acetylation process, measures are taken to control the temperature at the top of the separation column through the reflux flow to not exceed 125°C .

[0055] The low molecular weight bishydroxy polyphenylene ether 35g that obtains in embodiment 1 is dissolved in 50 ℃ 60ml toluene, in N 2 (0.1L / min) under purging, add 517g of acetic anhydride and 0.1mg of zinc acetate, the temperature of the reactor is gradually raised to 145°C, and the reflux temperature at the top of the reactor is controlled at 120°C for 1.0 hour.

[0056] Add 460g HBA, 158g HNA, 5.0g terephthalic acid, continue to mai...

Embodiment 3

[0059] The equipment in Example 2 was used. The low molecular weight bishydroxy polyphenylene ether 60g obtained in embodiment 1 is dissolved in 60 ℃ 90ml toluene; 2 (0.12L / min) under purging, add 500g of acetic anhydride, 0.11g of zinc acetate, gradually heat up the reactor to 145°C, control the reflux temperature at the top of the reactor at 120°C, and keep it for 1 hour; add 438.1g of HBA, 150.5g of HNA , 4.7g of terephthalic acid, continue to maintain 145 ° C for 1 hour, and then increase the temperature to 310 ° C within 2 hours; stop reflux, connect a vacuum pump, and keep the absolute pressure in the reactor at 1KPa for 20 minutes to obtain a liquid crystal polymer.

[0060] In this example, the melting point of the obtained liquid crystal polymer was 287°C.

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Abstract

The invention provides a liquid crystal polymer as well as a preparation method and application thereof. The preparation method of the liquid crystal polymer comprises the steps of 1) carrying out oxidative coupling reaction on aryl phenol containing dihydroxyl and aryl phenol containing monohydroxyl in an organic solvent of a copper amine catalyst to obtain dihydroxyl low-molecular-weight polyphenyl ether; (2) carrying out acetylation reaction on the dihydroxyl low-molecular-weight polyphenyl ether and acetic anhydride in methylbenzene to obtain acetylation reaction liquid; and 3) adding a liquid crystal polymer monomer into the acetylation reaction liquid to perform condensation polymerization to form the liquid crystal polymer. The liquid crystal polymer obtained by the preparation method disclosed by the invention is excellent in heat resistance and mechanical property, high in dielectric constant, relatively low in melting point, easy to process and low in production cost, can be widely applied to processing of high-strength film materials, and is particularly suitable for processing of electronic devices and high-frequency circuit boards.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a liquid crystal polymer and its preparation method and application. Background technique [0002] Liquid crystal polymer is a polymer plastic with excellent comprehensive properties, which has the characteristics of good heat resistance, low creep, high dielectric constant and good mechanical properties. It can be prepared into thin sheet materials, which are mainly used in the processing and production of high-end electronics, electrical appliances, and auto parts. However, liquid crystal polymers have high melting points and harsh processing conditions. In addition, the high cost of liquid crystal polymers due to the high price of monomer raw materials restricts their wide application. [0003] To improve performance while reducing cost, TLCPs are often blended with thermoplastics. Among them, because the engineering plastic polyphenylene ether has a high dielectric constant...

Claims

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Application Information

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IPC IPC(8): C08G63/66C08G63/78C08G65/48C08G65/44C09K19/38C08J5/18C08L67/00
CPCC08G63/66C08G63/78C08G65/485C08G65/44C09K19/3809C08J5/18C08J2367/00
Inventor 廖平
Owner 上海孛柯博科技有限公司
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