A kind of preparation method of colored polyimide film
A technology of polyimide film and color, which is applied in the field of preparation of colored polyimide film, can solve the problems of weak interface binding force and high light transmittance, and achieve the effects of high flatness, uniform color and various colors
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Embodiment 1
[0027] 1. Dispersion steps of color pigments
[0028] Add 40ml of N,N-dimethylacetamide to a 250mL three-necked flask, take 0.56g of cobalt green and add it to the solvent, and at the same time add 0.01% of a mixed wetting agent composed of sulfonated oil and propylene glycol, and add 0.1% of water glass and A mixed dispersant composed of sodium pyrophosphate, and 0.01% acrylic resin, ultrasonicated at 25°C for 10-20 hours to prepare a dispersion of color pigments;
[0029] 2. In situ Polymerization of Monomers for Polyimide Synthesis
[0030] Add 2 mol of ODA to step 1, stir vigorously for 15-30 min until fully dissolved, and then add 2.04 mol of BTDA in batches. Stir in an ice bath, react for 8 hours, and protect with nitrogen throughout the process to obtain a color pigment-polyamic acid solution with a solid content of 0.5%;
[0031] 3. Preparation of colored polyimide film
[0032] Cast the solution obtained in step 2 on a glass plate, scrape it flat with a film applic...
Embodiment 2
[0035] 1. Color pigment dispersion step
[0036] Add 40ml of N,N-dimethylformamide to a 250mL three-necked flask, take 1.174g of malachite blue and cobalt blue mixed pigments, add solvent, and add 0.1% mixed wetting agent composed of sulfonated oil and soybean lecithin, Add 0.02% mixed dispersant composed of water glass and sodium hexametaphosphate, and 0.05% urea-formaldehyde resin, and ultrasonicate at 30°C for 10-20 hours to prepare a dispersion of color pigments;
[0037] 2. In situ Polymerization of Monomers for Polyimide Synthesis
[0038] Add 2 mol of ODA to step 1, stir vigorously for 15-30 min until fully dissolved, and then add 2.04 mol of BTDA in batches. Stir in an ice bath, react for 8 hours, and protect with nitrogen throughout the process to obtain a color pigment-polyamic acid solution with a solid content of 1%.
[0039] 3. Preparation of colored polyimide film
[0040] Cast the solution obtained in step 2 on a glass plate, scrape it flat with a film applic...
Embodiment 3
[0043] 1. Color pigment dispersion step
[0044] Add 50ml of N,N-dimethylacetamide to a 250mL three-necked flask, take 1.87g of cadmium red and zirconium iron red mixed pigments and add to the solvent, add 0.06% sulfonated oil, add 0.01% sodium pyrophosphate and hexametaphosphoric acid Sodium mixed dispersant and 0.05% urea-formaldehyde resin, ultrasonic at 35°C for 10-30h, to prepare color pigment dispersion;
[0045] 2. In situ Polymerization of Monomers for Polyimide Synthesis
[0046] Add 2 mol of ODA to step 1, stir vigorously for 15-30 min until fully dissolved, and then add 2.04 mol of BTDA in batches. Stir in an ice bath, react for 10 hours, and protect with nitrogen throughout the whole process to obtain a color pigment-polyamic acid solution with a solid content of 1.5%;
[0047] 3. Preparation of colored polyimide film
[0048] Cast the solution obtained in step 2 on a glass plate, scrape it flat with a film applicator, place it in a vacuum oven for temperature c...
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