Preparation method of polyimide film
A technology of polyimide membrane and catalyst, which is applied in the field of polyimide membrane preparation, can solve the problems of complex preparation method and poor processing performance of polyimide membrane, and achieve simple preparation method and reduction of dehydrating agent steps, cost-saving effect
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[0012] The preparation method of the polyimide membrane provided by the present invention comprises: in the presence of an organic solvent, contacting and reacting an aromatic dianhydride with a diisocyanate, mixing the reaction product with a catalyst to obtain a slurry, and coating the slurry on a support , Heating at 160-200 ° C; the catalyst is a basic catalyst.
[0013] According to the preparation method provided by the present invention, preferably, the temperature for the contact reaction of the aromatic dianhydride and the diisocyanate is 10-90°C, preferably 25-60°C, and the time for the contact reaction is 6-10 hours, Preferably for 6-8 hours, the molar ratio of the aromatic dianhydride to the diisocyanate is 1:0.9-1.1, preferably 1:1-1.05, the total weight of the aromatic dianhydride and diisocyanate to the The weight ratio of the solvents is 1:5-10, preferably 1:8-10. In order to make the polymerization reaction of aromatic dianhydride and diisocyanate more comple...
Embodiment 1
[0024] Dry all kinds of utensils and medicines to be used;
[0025] Measure 800ml of N,N-dimethylacetamide (DMAc) into the reactor, then add 0.5mol (87.08 grams) of 2,4-toluene diisocyanate to the reactor, and seal the reactor to prevent air Moisture enters the reaction system, stir until the 2,4-toluene diisocyanate is completely dissolved to obtain a 2,4-toluene diisocyanate solution;
[0026] 0.5 mol (109 grams) of pyromellitic dianhydride was added in 5 times to the obtained 2,4-toluene diisocyanate solution, and the polymerization reaction was carried out at a reaction temperature of 40° C. for 7 hours to obtain a reaction product;
[0027] Then, slowly dropwise add 0.5 mol (50.07 g) of benzimidazole as a catalyst to the reaction product within 50 minutes, control the temperature at 35° C., stir for about 1 hour, and mix the catalyst uniformly to obtain a slurry;
[0028] The obtained slurry was coated on a steel plate and heated at a temperature of 160°C to volatilize b...
Embodiment 2
[0037]Dry all kinds of utensils and supplies to be used;
[0038] Measure 2000ml of N,N-dimethylformamide (DMF) into the reactor, then add 1.0mol (250.24 grams) of 4,4-diphenylmethane diisocyanate to the reactor, and seal the reactor , stirring until 4,4-diphenylmethane diisocyanate is completely dissolved to obtain 4,4-diphenylmethane diisocyanate solution;
[0039] In the obtained 4,4-diphenylmethane diisocyanate solution, add 1.0mol (292.22 grams) 3,3',4,4'-biphenyltetracarboxylic dianhydride in 4 times at a reaction temperature of 25°C. Polymerization reaction was carried out for 6 hours to obtain a reaction product;
[0040] Then, within 50 minutes, 1.05 mol (128.279 grams) of pyridine as a catalyst was slowly added dropwise to the reaction product, the temperature was controlled at 30° C., and stirred for about 1.5 hours, so that the catalyst was mixed uniformly to obtain a slurry;
[0041] The obtained slurry was coated on a glass plate and heated at a temperature of ...
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