Thermoplastic polyimide resin and preparation method thereof
A technology of polyimide resin and soluble polyimide resin, applied in the field of thermoplastic polyimide resin and its preparation, can solve problems such as loss of melt flow behavior, and achieve easy processing, low cost and ideal mechanical properties Effect
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Embodiment 1
[0058] At room temperature, 1.7044 g (0.004 mol) of 4,4'-bis(3-aminophenoxy)diphenyl sulfone (m-BAPS) was dissolved in 10.3076 g of N,N-dimethylacetamide In the polymerization reaction bottle, stir mechanically, add 0.8725 g (0.004 mole) pyromellitic dianhydride (PMDA) in batches after complete dissolution, fill with nitrogen protection and continue stirring for 12 hours to obtain a polyamic acid solution with a solid content of 20%. .
[0059] Pour the obtained polyamic acid solution into ethanol to gel into a solid, and soak it for 24 hours, wash it with ethanol once every 12 hours, centrifuge the soaked solid, and dry it at 110°C, then pulverize it and heat it Cyclization: keep at 80°C for 2 hours, step up the temperature to 110°C, 140°C, 170°C, 200°C, and 230°C, and keep at each step for 30 minutes, then cool naturally, and finally grind at high speed to obtain polyimide resin powder.
[0060] The molecular structure of transparent polyimide film is as follows in the pres...
Embodiment 2
[0064] At room temperature, 1.7044 g (0.004 mol) of 4,4'-bis(3-aminophenoxy)diphenyl sulfone (m-BAPS) was dissolved in 10.3076 g of N,N-dimethylacetamide In the polymerization reaction bottle, stir mechanically, add 0.8725 g (0.004 mole) pyromellitic dianhydride (PMDA) in batches after complete dissolution, fill with nitrogen protection and continue stirring for 12 hours to obtain a polyamic acid solution with a solid content of 20%. .
[0065] Add 1 g of acetic anhydride and 0.8 g of triethylamine to the polyamic acid solution under stirring. After stirring for 1 hour, it gels in ethanol to obtain a solid, and soaks it for 24 hours, during which time it is washed with ethanol every 12 hours. The soaked solid is centrifuged and dried at 110°C, then pulverized, and heated for cyclization: maintain at 80°C for 2 hours, step by step increase the temperature to 110°C, 140°C, 170°C, 200°C, and 230°C, and maintain each step 30 minutes, then naturally cooled, and finally high-speed ...
Embodiment 3
[0070] At room temperature, 1.7044 g (0.004 mol) of 4,4'-bis(3-aminophenoxy)diphenylsulfone (m-BAPS) was dissolved in 11.5252 g of N,N-dimethylacetamide Add 1.1769 g (0.004 mol) of 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) in batches after complete dissolution, and continue stirring for 12 hours under nitrogen protection. A polyamic acid solution with a solid content of 20% was obtained.
[0071] Pour the obtained polyamic acid solution into ethanol to gel into a solid, and soak it for 24 hours, wash it with ethanol once every 12 hours, centrifuge the soaked solid, and dry it at 110°C, then pulverize it and heat it Cyclization: keep at 80°C for 2 hours, step up the temperature to 110°C, 140°C, 170°C, 200°C, and 230°C, and keep at each step for 30 minutes, then cool naturally, and finally grind at high speed to obtain polyimide resin powder.
[0072] The molecular structure of polyimide resin in the present embodiment is as follows:
[0073]
[0074] The glass t...
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