A kind of preparation method of rigid polyimide foam material
A technology of polyimide and foam materials, which is applied in the field of polymer material preparation, can solve the problems of difficult large-scale preparation, poor bonding performance between microspheres, and reduced thermal oxidation resistance, etc., to achieve easy realization Effects of scale, abundant candidate raw materials, and cost reduction
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Embodiment 1
[0030] Method for preparing a hard polyimide foam material, the method comprising the steps of:
[0031] A. The dried 3, 3 ', 4,4'-diphenyl ether tetrahydride 31 g is added to a mixed solvent containing 60 g of tetrahydrofuran and 12.8 g of methanol, warmed to 60 ° C, while stirring for 3 h after cooling to room temperature, 41 g 2,2-double [4- (4-aminopenzoxy) phenyl] propane (BAPP) was added, and then 3.6 gak8805 was added to 60 ° C for 2 h, and 3.6 gak8805 was added, and the precursor solution was obtained.
[0032] B. Treatment of the precursor solution in an oven at 90 ° C, then pulverized into a 120 ° C oven for foaming, duration of 60 min;
[0033] c, the above-mentioned foam is hot, the hot press temperature is 130 ° C, the compressive strength is 10 MPa, and then the sample is placed in a mold of 320 ° C, the closed mold is foamed, the foaming time is maintained for 2 h, then naturally cooling to room temperature, thus Get a hard polyimide foam;
[0034] The material has ...
Embodiment 2
[0037] Method for preparing a hard polyimide foam material, the method comprising the steps of:
[0038] A. The dried 3, 3 ', 4,4'-diphenyl ether tetrahydride 31 g is added to a mixed solvent containing 60 g of tetrahydrofuran and 12.8 g of methanol, warmed to 60 ° C, while stirring for 3 h after cooling to room temperature, 41 g 2,2-double [4- (4-aminopenzoxy) phenyl] propane (BAPP) was added, and then 3.6 gak8805, 3.6 g of foaming auxiliaries were added to 60 ° C for 2 h, which was added to obtain a precursor solution. ;
[0039] B, the precursor solution was treated in an oven at 85 ° C, and then pulverized into a 120 ° C oven for foaming, duration of 60 min;
[0040] c, the above-mentioned foam is hot, the hot press temperature is 130 ° C, the compressive strength is 10 MPa, and then the sample is placed in a mold of 320 ° C, the closed mold is foamed, the foaming time is maintained for 2 h, then naturally cooling to room temperature, thus Get a hard polyimide foam;
[0041] Th...
Embodiment 3
[0043] Method for preparing a hard polyimide foam material, the method comprising the steps of:
[0044] A. The dried 3, 3 ', 4,4'-diphenyl ether tetrahydride 32.2 g of a mixed solvent containing 50 g of tetrahydrofuran and 12.8 g of methanol was added, warmed to 60 ° C, and the temperature was stirred for 3 h after cooling to room temperature. To add 29.2 g of 1,3-bis (4'-amine-based phenoxy) benzene (1,3,4-APB), and then increasing 3.6 gak8805, 7.0 g of foaming auxiliaries, discharged from 60 ° C for 2 h. Get the precursor solution;
[0045] B, the precursor solution was treated in an oven at 90 ° C, and then pulverized into a 100 ° C oven for foaming, duration of 30 min;
[0046] c, the above-mentioned foam is hot, the hot press temperature is 110 ° C, the compressive strength is 10 MPa, and then the sample is placed in a mold of 300 ° C, the shutdown is foamed, the foaming time is maintained for 2 h, then naturally cooling to room temperature, thus Get a hard polyimide foam;
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