High-temperature-resistant and flame-retardant polyimide foam material and preparation method thereof

The invention provides a polyimide foam material which comprises the following raw materials in parts by weight: 15-60 parts of pyrrolone polyamide acid precursor, 15-60 parts of isocyanate, 10-40 parts of solvent, 2-8 parts of foaming agent, 5-12 parts of foam stabilizer and 0.5-5 parts of catalyst. A pyrrolone polyamide acid precursor prepared from PMDA and tetraphenylamine reacts with an isocyanate group and is foamed, a trapezoidal polyimide structure is introduced into foam through an imidization process, and the oxygen index and the mechanical property of the introduced trapezoidal polyimide rigid structure are obviously improved. The prepared foam material has the advantages and characteristics of high oxygen index, high temperature resistance and the like.