Preparation method of high-elasticity and high-heat-resistance polyimide

• Main Authors: ZHANG JIANQING, GU GUANGXIN, LIU BENBO, ZHANG BIN
• Format: Patent
• Language: Chinese; English
• Published: 15.05.2020
• 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 discloses a preparation method of high-elasticity and high-heat-resistance polyimide. The preparation method comprises the following steps: firstly, preparing cage-shaped octamer (gamma-aminopropyl) silsesquioxane by taking gamma-aminopropyl triethoxysilane as a raw material; then, completely dissolving cage-shaped octamer (gamma-aminopropyl) silsesquioxane and a polar solution in athree-neck bottle; sequentially adding diamine and dianhydride to obtain a yellow uniform viscous liquid, coating the liquid on a glass plate, putting the glass plate in a vacuum oven and a muffle furnace, taking out the glass plate, and sequentially carrying out constant-temperature water bath, cooling and demolding to finally obtain modified polyimide. The preparation method has the beneficial effects that the whole technological process is simple, the cost is reduced, important industrialization significance is achieved, and the modified polyimide has an excellent mechanical property and thermodynamic stability. 本发