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1. (WO2013143288) PREPARATION METHOD OF POLYIMIDE

Pub. No.:    WO/2013/143288    International Application No.:    PCT/CN2012/084293
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Fri Nov 09 00:59:59 CET 2012
IPC: C08G 73/10
Applicants: CHANGCHUN HIPOLYKING CO., LTD
长春高琦聚酰亚胺材料有限公司
DING, Mengxian
丁孟贤
Inventors: DING, Mengxian
丁孟贤
ZHANG, Xin
张鑫
ZHONG, Jibin
钟吉彬
LV, Xiaoyi
吕晓义
Title: PREPARATION METHOD OF POLYIMIDE
Abstract:
The present invention provides a preparation method of polyimide, comprising the following steps: a) carrying out a dehydration polymerization reaction on a diamine and an anhydride of an organic acid in a non-polar solvent to obtain a mixture, the non-polar solvent being one or more of arene, aliphatic hydrocarbon, halogenated arene and halogenated aliphatic hydrocarbon, and the anhydride of the organic acid being one or more of dianhydride and single anhydride; and b) filtering the mixture obtained in step a) and drying to obtain the polyimide. In the present invention, the dehydration polymerization reaction between the diamine and the anhydride of the organic acid can be carried out directly in the non-polar solvent to obtain the polyimide which cannot be dissolved in the non-polar solvent. Therefore, polyimide powder with fine particles can be obtained by directly filtering and drying the reaction mixture without washing. Not only complex washing and grinding processes are not needed, but also the production period is shortened, the production cost is reduced, and the large-scale production becomes more convenient.