Polyimide foam and method of producing the same
A polyimide and foam technology, applied in the field of polymer materials, can solve problems such as complex process, difficult control of foam intermediate solution, and limited application range
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Embodiment 1
[0022] Put 92.4 grams of 1,2,4,5-pyromellitic anhydride into 140 grams of dimethylformamide and stir well. When the solids of 1,2,4,5-pyromellitic anhydride are all dissolved, the solution becomes After clarification, add 11 grams of anhydrous methanol and 7 grams of low molecular weight polyethylene glycol (PEG-600). After the temperature of the solution naturally drops below 45°C, add 10 grams of deionized water and 18 grams of surfactant AK-168. , 0.5 grams of triethanolamine, 0.2 grams of stannous octoate. Stir the above solution to a constant temperature to obtain a pink viscous foam precursor solution.
[0023] Measure 15 grams of foam precursor solution, and stir quickly with equal mass of polyphenyl polymethylene polyisocyanate. After the solution starts to turn white, pour it into the pre-prepared mold, foam freely for 2-3 minutes, and the foam will be removed. After sticking, put it in a microwave device for 30-45 minutes to form a foam intermediate, then put the foam in...
Embodiment 2
[0031] Put 68.2 grams of 3,3',4,4'-benzophenonetetracarboxylic dianhydride into 140 grams of dimethylformamide and stir thoroughly, gradually heat to 120°C, stay for 20 minutes, and then cool to below 80°C. Add 9.8 grams of anhydrous methanol and 9 grams of low molecular weight polyethylene glycol (PEG-1000). When the temperature of the solution naturally drops below 50°C, 10 deionized water, 15 grams of surfactant DC193, 0.6 grams of triethanolamine, and 0.2 grams of stannous octoate are sequentially added to the above solution. The above solution was stirred to a constant temperature to obtain a light brown foam precursor solution.
[0032] Measure 20 grams of foam precursor solution, quickly stir with 18 grams of isophorone diisocyanate, and pour the solution into the pre-prepared mold after the solution starts to turn white, foam freely for 3-5 minutes, and put in after the foam is debonded Set in microwave equipment for 30-45 minutes to obtain foam intermediates, then put the...
Embodiment 3
[0040] Put 74.6 grams of 3,3',4,4'-bipyromellitic dianhydride into 100 grams of dimethylformamide and stir well, gradually heat to 120°C, wait for the solids to dissolve, stay for 20 minutes, and then cool down To below 80°C, add 6 anhydrous methanol and 4.5 grams of low molecular weight polyethylene glycol (PEG-400). When the temperature of the solution naturally drops below 45°C, add 6 grams of deionized water, 11 grams of surfactant DC193, 0.3 grams of triethylene diamine, and 0.15 grams of dibutyl tin dilaurate. Stir the above solution to a constant temperature to obtain a brown-red viscous foam precursor solution.
[0041] Measure 20 grams of foam precursor solution, and stir quickly with equal mass of polyphenyl polymethylene polyisocyanate. After the solution starts to turn white, pour it into the pre-prepared mold and foam freely for 3-5 minutes. After sticking, put it in a microwave device for 30-50 minutes to form a foam intermediate, then put the foam intermediate into ...
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