Polyimide foam is a lightweight porous material with flame-retardant, environmentally friendly, non-toxic, halogen-free, ozone-free, high temperature resistance, radiation resistance, easy processing and easy installation, and can be used under extremely harsh conditions such as ultra-high temperature, ultra-low temperature, high salt spray, strong noise and strong radiation. When limited by weight and space, polyimide foams can perform normally equivalent functions with minimal volume and quality, with extremely high reliability and quality assurance. Our company has been engaged in the research of polyimide foam preparation for more than ten years, and has developed a series of polyimide foam products, which have been applied to aerospace, naval ships, new energy, construction and other fields.