Preparation method of rigid polyimide foam material
A technology of polyimide and foam materials, applied in the field of polymer material preparation, can solve the problems of difficult to achieve large-scale preparation, poor adhesion between microspheres, and reduced thermal oxidation resistance, etc., and achieves easy popularization. , The effect of high closed cell rate and cost reduction
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Embodiment 1
[0030] A preparation method of rigid polyimide foam material, the method may further comprise the steps:
[0031] a. Add 31 g of dried 3,3',4,4'-diphenyl ether tetra-acid dianhydride into a mixed solvent containing 60 g of tetrahydrofuran and 12.8 g of methanol, raise the temperature to 60°C, keep stirring for 3 hours, then cool down to room temperature, Add 41g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane (BAPP), heat up to 60°C and mix for 2 hours, then add 3.6g of AK8805, and discharge to obtain a precursor solution;
[0032] b. Treat the precursor solution in an oven at 90°C for 1 hour, then pulverize it and place it in an oven at 120°C for foaming for 60 minutes;
[0033] c. Hot press the foam obtained above, the hot pressing temperature is 130°C, and the compressive strength is 10MPa, then the sample is placed in a mold at 320°C, the mold is closed and foamed, and the foaming time is maintained for 2 hours, and then the temperature is naturally cooled to room temperature,...
Embodiment 2
[0037] A preparation method of rigid polyimide foam material, the method may further comprise the steps:
[0038] a. Add 31 g of dried 3,3',4,4'-diphenyl ether tetra-acid dianhydride into a mixed solvent containing 60 g of tetrahydrofuran and 12.8 g of methanol, raise the temperature to 60°C, keep stirring for 3 hours, then cool down to room temperature, Add 41g of 2,2-bis[4-(4-aminophenoxy)phenyl]propane (BAPP), heat up to 60°C and mix for 2 hours, then add 3.6g of AK8805 and 3.6g of foaming aid, and discharge to obtain a precursor solution ;
[0039] b. Treat the precursor solution in an oven at 85°C for 1 hour, then pulverize it and place it in an oven at 120°C for foaming for 60 minutes;
[0040] c. Hot press the foam obtained above, the hot pressing temperature is 130°C, and the compressive strength is 10MPa, then the sample is placed in a mold at 320°C, the mold is closed and foamed, and the foaming time is maintained for 2 hours, and then the temperature is naturally coo...
Embodiment 3
[0043] A preparation method of rigid polyimide foam material, the method may further comprise the steps:
[0044] a. Add 32.2g of dried 3,3',4,4'-diphenyl ether tetra-acid dianhydride into a mixed solvent containing 50g of tetrahydrofuran and 12.8g of methanol, raise the temperature to 60°C, keep stirring for 3h and then cool down to room temperature , add 29.2g 1,3-bis(4'-aminophenoxy)benzene (1,3,4-APB), heat up to 60°C and mix for 2 hours, then add 3.6g AK8805, 7.0g foaming aid, and discharge Obtain precursor solution;
[0045] b. Treat the precursor solution in an oven at 90°C for 1 hour, then pulverize it and place it in an oven at 100°C for foaming for 30 minutes;
[0046] c. Hot press the foam obtained above, the hot pressing temperature is 110°C, and the compressive strength is 10MPa, then the sample is placed in a mold at 300°C, the mold is closed and foamed, and the foaming time is maintained for 2 hours, and then the temperature is naturally cooled to room temperat...
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