The invention discloses a method and product for preparing
polyimide open-
cell foam by one-
step method. The preparation method includes the following steps: Step 1: dissolving the corresponding
mass of
organic acid auxiliary agent in the polar
solvent of diacid diester in proportion In the solution, stir evenly to obtain foaming
slurry A; step 2: mix the catalyst, foam stabilizer and
foaming agent in proportion to obtain foaming
slurry B; step 3: weigh the corresponding
mass of polyisocyanate as the foaming
slurry Slurry C; and keep foaming slurry C at the same temperature as foaming slurry A and foaming slurry B; step 4: mix foaming slurry A, foaming slurry B and foaming slurry C , to obtain a
polyimide foam intermediate; Step 5: demoulding the
polyimide foam intermediate, and placing it in a blast
drying oven, and then raising the temperature of the blast
drying oven to 170-200°C to obtain a polyimide foam intermediate. Amine
open cell foam. The invention has the characteristics of effectively improving the sound absorption performance, simplifying the production process and reducing the production cost.