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A kind of polyurea-polyimide block copolymer molding powder and preparation method thereof

A polyimide block and copolymer technology is applied in the field of polymer molding powder and its preparation, which can solve the problems of polyimide being difficult to process, poor in heat resistance, limitation and the like, so as to overcome the poor temperature resistance. , the effect of excellent comprehensive performance, good thermal stability and processability

Active Publication Date: 2022-01-18
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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  • A kind of polyurea-polyimide block copolymer molding powder and preparation method thereof
  • A kind of polyurea-polyimide block copolymer molding powder and preparation method thereof
  • A kind of 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 (the molar ratio to diamine is 1.08:1) is added three times, mechanically stirred, and diphenylmethane diisocyanate is added every 15 minutes to ensure that the diisocyanate added last time completely dissolved. The reaction was completed at 70° C. for 4.5 hours, and an isocyanate group-terminated polyurea was obtained.

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

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 (the molar ratio to diamine is 1.08:1) is added three times, mechanically stirred, and diphenylmethane diisocyanate is added every 15 minutes to ensure that the diisocyanate added last time completely dissolved. The reaction was completed at 70° C. for 4.5 hours, and an isocyanate group-terminated polyurea was obtained.

[0048] 2. Preparation of amino-terminated polyamic acid solution: First, take 20g of 4,4'-diaminodiphenyl ether and 269g of N,N-dimethylacetamide and stir in a three-necked flask to make 4,4'-diaminodiphenyl ether Phenyl ether is completely dissolved, add 27.5g of 3,3',4,4'-biphenyltetracarboxylic dianhydride three times, stir mechanically, add 3,3',4,4'-biphenyltetracarboxylic dianhydride once ever...

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 (the molar ratio to diamine is 1.08:1) is added three times, mechanically stirred, and diphenylmethane diisocyanate is added every 15 minutes to ensure that the diisocyanate added last time completely dissolved. The reaction was completed at 70° C. for 4.5 hours, and an isocyanate group-terminated polyurea was obtained.

[0053] 2. Preparation of amino-terminated polyamic acid solution: First, take 20g of 4,4'-diaminodiphenyl ether and 269g of N,N-dimethylacetamide and stir in a three-necked flask to make 4,4'-diaminodiphenyl ether Phenyl ether is completely dissolved, add 27.5g of 3,3',4,4'-biphenyltetracarboxylic dianhydride three times, stir mechanically, add 3,3',4,4'-biphenyltetracarboxylic dianhydride once ever...

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Abstract

The invention discloses a polyurea-polyimide block copolymer molding powder and a preparation method thereof, wherein the structural formula of the polyurea-polyimide block copolymer molding powder is: the values ​​of m and n An integer in the range 0‑1000. The polyurea-polyimide block copolymer molding powder prepared by the invention not only improves the processing performance of the polyimide, but also maintains its good thermal stability and excellent comprehensive performance. Molding powders with different hardness and heat resistance can be obtained by adjusting the content of polyurea segments.

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 corrosion resistance and radiation resistance due to its very stable aromatic heterocyclic rigid structural unit. As an important application form of polyimide, molding powder is mainly used in compression molding to prepare polyimide parts, and is widely used in automobiles, microelectronics, electronics, machinery, aviation and other fields. However, traditional polyimides have disadvantages such as difficult melting, high curing temperature, poor toughness, and poor processability. Therefore, the introduction of other groups by copolymerization is an important way to modify polyimide. [0003] Polyurea is an elastomer materia...

Claims

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Application Information

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