Method for preparing polyimide nano-film
A technology of polyimide film and polyimide, applied in the field of preparation of nanometer polyimide film
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Embodiment 1
[0051] 1) Mix 3,4,3',4'-terphenyl dianhydride and 4,4'-diaminodiphenylmethane evenly, then add 20 parts of high boiling point solvent N-methylpyrrolidone and mix to form a uniform system , and then under the protection of nitrogen, the homogeneous system was heated to 180°C for 1 hour, and then slowly cooled to 50°C to obtain a polyimide precursor with a carboxylic acid structure, and then to the polyimide with a carboxylic acid structure 4,4'-diphenylmethane diisocyanate was added to the precursor, and the temperature was raised to 120°C for 3 hours to obtain a polyimide resin with a viscosity of 4500 centipoise, wherein the 3,4,3',4'-para Terphenyldianhydride, 4,4'-diaminodiphenylmethane and 4,4'-diphenylmethane diisocyanate are proportioned according to a molar ratio of 1:0.5:0.3;
[0052] 2) In parts by mass, 10 parts of polyimide resin, 85 parts of polar organic solvent N,N-dimethylformamide, 0.1 part of diluent chlorobenzene, 1 part of film-forming agent cresol , the mo...
Embodiment 2
[0055] 1) Mix 3,4,3',4'-terphenyl dianhydride and 4,4'-diaminodiphenylmethane evenly, then add 30 parts of high boiling point solvent N-methylpyrrolidone and mix to form a uniform system , and then under the protection of nitrogen, the homogeneous system was heated to 180°C for 0.5 hours at a constant temperature, and slowly cooled to 55°C to obtain a polyimide precursor with a carboxylic acid structure, and then to the polyimide precursor with a carboxylic acid structure Add 4,4'-diphenylmethane diisocyanate to the body and slowly raise the temperature to 140°C for 0.5 hours to obtain a polyimide resin with a viscosity of 4000 centipoise, wherein the 3,4,3',4'-pair triple Phthalic anhydride, 4,4'-diaminodiphenylmethane and 4,4'-diphenylmethane diisocyanate are proportioned according to the molar ratio of 0.9:0.5:0.4;
[0056] 2) In parts by mass, 45 parts of polyimide resin, 90 parts of polar organic solvent pyridine, 0.2 part of thinner dimethyl phthalate, 1 part of film-for...
Embodiment 3
[0059] 1) Mix 3,4,3',4'-terphenyl dianhydride and 4,4'-diaminodiphenylmethane evenly, then add 50 parts of high boiling point solvent N-methylpyrrolidone and mix to form a uniform system , and then under the protection of nitrogen, the homogeneous system was heated to 180°C for 2 hours at a constant temperature, and slowly cooled to 60°C to obtain a polyimide precursor with a carboxylic acid structure, and then to the polyimide precursor with a carboxylic acid structure Add 4,4'-diphenylmethane diisocyanate to the body and slowly raise the temperature to 140°C for 3 hours to obtain a polyimide resin with a viscosity of 2800 centipoise, wherein the 3,4,3',4'-pair triple Phthalic anhydride, 4,4'-diaminodiphenylmethane and 4,4'-diphenylmethane diisocyanate are proportioned according to the molar ratio of 0.8:0.5:0.5;
[0060] 2) In parts by mass, 20 parts of polyimide resin, 80 parts of polar organic solvent dimethyl sulfone, 0.2 part of diluent isophorone, 1 part of film-forming...
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