A solvent open and closed polyimide foam process for continuously preparing

The solvent for the continuous preparation of open and closed without the polyimide foam method; one or more dianhydrides will now be dissolved or suspended in a polyol to form the precursor A, various additives were dissolved in the polyol is formed B precursor, aromatic isocyanates different molecular structures form a precursor mixed C; and mixing the three kinds of one-shot foam precursors, to obtain a polyimide foam excellent properties after cure. Without the use of volatile solvent does not participate in the reaction process, and therefore the absence of a solvent in addition to the process can be continuously produced using a double-sided belt heating method. Primary gas generating system and the foaming reaction is CO2, so no solvent recovery costs and reduce environmental pollution.