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Polyurea-polyimide block copolymer molding powder and preparation method thereof

A polyimide block and copolymer technology, applied in the field of polymer molding powder and its preparation, can solve the problems of poor heat resistance, difficult processing of polyimide, limitation, etc. Effects of poor temperature, good thermal stability and processability

Active Publication Date: 2019-06-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurea and polyimide are two polymer materials with excellent performance, but the disadvantages of polyurea's poor heat resistance and polyimide's difficulty in processing greatly limit their application in certain technical fields

Method used

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  • Polyurea-polyimide block copolymer molding powder and preparation method thereof
  • Polyurea-polyimide block copolymer molding powder and preparation method thereof
  • Polyurea-polyimide block copolymer molding powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Preparation of isocyanate-terminated polyurea: First, measure 1g of 4,4'-diaminodiphenyl ether and 18g of N,N-dimethylacetamide, stir to make 4,4'-diaminodiphenyl The ether is completely dissolved in the solvent, and 1.35g of diphenylmethane diisocyanate (molar ratio to diamine is 1.08:1) is added in three times, mechanically stirred, and diphenylmethane diisocyanate is added every 15min to ensure that the diisocyanate added previously completely dissolved. The reaction was completed at 70°C for 4.5 hours to obtain an isocyanate group-terminated polyurea.

[0043] 2. Preparation of amino-terminated polyamic acid solution: first take 20g of 4,4'-diaminodiphenyl ether and 269g of N,N-dimethylacetamide into a three-necked flask and stir to make 4,4'-diaminodiphenyl The phenyl ether is completely dissolved, add 27.5g of 3,3',4,4'-biphenyltetracarboxylic dianhydride in three times, mechanically stir, add 3,3',4,4'-biphenyltetracarboxylic dianhydride once every 15min Anhydr...

Embodiment 2

[0047] 1. Preparation of isocyanate-terminated polyurea: First, measure 2g of 4,4'-diaminodiphenyl ether and 36g of N,N-dimethylacetamide, stir to make 4,4'-diaminodiphenyl The ether is completely dissolved in the solvent, and 2.7g of diphenylmethane diisocyanate (molar ratio to diamine is 1.08:1) is added in three times, mechanically stirred, and diphenylmethane diisocyanate is added every 15min to ensure the diisocyanate added previously completely dissolved. The reaction was completed at 70°C for 4.5 hours to obtain an isocyanate group-terminated polyurea.

[0048] 2. Preparation of amino-terminated polyamic acid solution: first take 20g of 4,4'-diaminodiphenyl ether and 269g of N,N-dimethylacetamide into a three-necked flask and stir to make 4,4'-diaminodiphenyl The phenyl ether is completely dissolved, add 27.5g of 3,3',4,4'-biphenyltetracarboxylic dianhydride in three times, mechanically stir, add 3,3',4,4'-biphenyltetracarboxylic dianhydride once every 15min Anhydride, t...

Embodiment 3

[0052] 1. Preparation of isocyanate-terminated polyurea: First, measure 4g of 4,4'-diaminodiphenyl ether and 72g of N,N-dimethylacetamide, stir to make 4,4'-diaminodiphenyl The ether is completely dissolved in the solvent, and 5.4g of diphenylmethane diisocyanate (molar ratio to diamine is 1.08:1) is added three times, mechanically stirred, and diphenylmethane diisocyanate is added every 15min to ensure the diisocyanate added previously completely dissolved. The reaction was completed at 70°C for 4.5 hours to obtain an isocyanate group-terminated polyurea.

[0053] 2. Preparation of amino-terminated polyamic acid solution: first take 20g of 4,4'-diaminodiphenyl ether and 269g of N,N-dimethylacetamide into a three-necked flask and stir to make 4,4'-diaminodiphenyl The phenyl ether is completely dissolved, add 27.5g of 3,3',4,4'-biphenyltetracarboxylic dianhydride in three times, mechanically stir, add 3,3',4,4'-biphenyltetracarboxylic dianhydride once every 15min Anhydride, to e...

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Abstract

The invention discloses polyurea-polyimide block copolymer molding powder and a preparation method thereof. The structural formula of the polyurea-polyimide block copolymer molding powder is that thevalue range of m and n is integers from 0 to 1,000. The prepared polyurea-polyimide block copolymer molding powder not only improves the processing performance of the polyimide, but also maintains good thermal stability, and the comprehensive performance is excellent. By adjusting the content of the polyurea section, the molding powder with different degrees of hardness and heat resistance is obtained.

Description

Technical field [0001] The invention relates to a polymer molding powder and a preparation method thereof, in particular to a polyurea-polyimide block copolymer molding powder and a preparation method thereof. Background technique [0002] Polyimide is a material with excellent heat resistance, mechanical properties, electrical properties, chemical resistance and radiation resistance due to its very stable aromatic heterocyclic rigid structure unit. As an important application form of polyimide, molding powder is mainly used to prepare polyimide parts by compression molding, and is widely used in automotive, microelectronics, electronics, machinery, aviation and other fields. However, traditional polyimides have disadvantages such as difficulty in melting, high solidification temperature, poor toughness, and poor processing performance. Therefore, the introduction of other groups through copolymerization is an important way for polyimide modification. [0003] Polyurea is an elas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G18/32C08G73/10
Inventor 史铁钧刘晶刘春华陆飞
Owner HEFEI UNIV OF TECH