Preparation method of quickly freeze-dried polyimide aerogel

• Main Authors: WANG ZHICHAO, LI ZIYAN, SU CONGXUAN, FAN ZHUN, XU SHIYU, CUI SHENG, MA YUECHENG
• Format: Patent
• Language: Chinese; English
• Published: 07.04.2023
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention belongs to the field of preparation processes of polyimide aerogel, and particularly relates to a preparation method of quick freeze-drying polyimide aerogel. According to the invention, a special solution environment and a simple and feasible sol-gel method are utilized, and the skeleton structure of polyimide is enhanced through a freezing-unfreezing process, so that the polyimide aerogel which is low in cost and easy to print and dye is prepared. The preparation method of the polyimide aerogel can perfectly iterate an existing freeze-drying polyimide aerogel material preparation process, solves the problems of high aerogel preparation cost, poor printing and dyeing capability and the like in the prior art, and solves the technical problem of poor reproducibility of an existing freeze-drying polyimide process. 本发明属于聚酰亚胺气凝胶的制备工艺领域，具体涉及一种快速冻干聚酰亚胺气凝胶的制备方法。本发明利用特殊的溶液环境和简单易行的溶胶凝胶方法，通过冷冻-解冻工艺加强聚酰亚胺的骨架结构，制得低成本、易印染聚酰亚胺气凝胶。该聚酰亚胺气凝胶的制备方法可完美迭代现有的冻干聚酰亚胺气凝胶材料制备工艺，克服了目前气凝胶制备成本高、印染能力差等问题，解决了现有冻干聚酰亚胺工艺复现性差的技术