Preparation method of colorless transparent polyimide film
A technology of transparent polyimide and polyamic acid, which is applied in the field of thin films, can solve the problems of low transmittance and limitation of visible light, achieve excellent optical transparency, prevent film yellowing, and improve optical performance
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Example Embodiment
[0027] Example 1:
[0028] In this embodiment, the colorless transparent polyimide film material has the following structural formula:
[0029]
[0030] The specific preparation steps are as follows:
[0031] (1) in the reactor filled with nitrogen protective gas, first dissolve 4,4'-diaminodiphenyl ether in DMAc solvent, then add hexafluoroisopropylidene tetracarboxylic dianhydride, and the molar ratio of charging is 1:1, 25°C mechanical stirring polycondensation reaction to obtain a polyamic acid solution with a rotational viscosity of 150000 mPa·s (25°C, type B) and a solid content of 20%.
[0032] (2) In the case of -15°C, add acetic anhydride (the dosage is 2 times the equivalent of the aromatic diamine) and isoquinoline (the dosage is 1.5 times the equivalent of the aromatic diamine) to the above-mentioned polyamic acid solution, and stir well. Dispersion, followed by defoaming treatment.
[0033] (3) Casting the defoamed solution on a glass support, heating to 120...
Example Embodiment
[0034] Example 2:
[0035] In this embodiment, the colorless transparent polyimide film material has the following structural formula:
[0036]
[0037] The specific preparation steps are as follows:
[0038] (1) In a reactor filled with nitrogen protective gas, first dissolve 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene in NMP solvent, then add hexafluoroisopropylidene The molar ratio of pyromellitic dianhydride is 1:1, and the polycondensation reaction is mechanically stirred at 25°C to obtain a polyamic acid solution with a rotational viscosity of 125000 mPa·s (25°C, type B) and a solid content of 18%.
[0039] (2) In the case of -10°C, add acetic anhydride (the dosage is 3 times the equivalent of the aromatic diamine) and isoquinoline (the dosage is 1.5 times the equivalent of the aromatic diamine) to the above-mentioned polyamic acid solution, and stir well. Dispersion, followed by defoaming treatment.
[0040] (3) Casting the defoamed solution onto a glass supp...
Example Embodiment
[0041] Example 3:
[0042] In this embodiment, the colorless transparent polyimide film material has the following structural formula:
[0043]
[0044] The specific preparation steps are as follows:
[0045] (1) In a reactor filled with nitrogen protective gas, first dissolve 4,4'-diamino-2,2'-bistrifluoromethyl biphenyl in DMAc solvent, and then add hexafluoroisopropylidene diphenyl The molar ratio of tetraacid dianhydride is 1:1, and the polycondensation reaction is mechanically stirred for 6 hours at 25°C to obtain a polyamic acid solution with a rotational viscosity of 100,000 mPa·s (25°C, type B) and a solid content of 15%.
[0046] (2) In the case of -10°C, add acetic anhydride (the dosage is 2.5 times the equivalent of the aromatic diamine) and isoquinoline (the dosage is 2 times the equivalent of the aromatic diamine) to the above-mentioned polyamic acid solution, and stir well. Dispersion, followed by defoaming treatment.
[0047] (3) Casting the defoamed solut...
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