METHOD OF PREPARING NONFLAMMABLE ELASTIC POLYURETHANE FOAM Russian patent published in 1995 - IPC

FIELD: polyurethane foam preparing. SUBSTANCE: at foaming composition on the basis of polyetherpolyol, polyisocyanate, activator, accelerator, cross-linking agent part of polyetherpolyol is mixed preliminary with foamgraphite in the form of plates of size 0.3-1.0 mm. Remaining part of polyetherpolyol is mixed with activator, accelerator, cross-linking agent and plate size corresponds the cell wall size of polyurethane foam. Polyetherpolyol is heated up to 40-70 C before addition of foamgraphite to it, then fume inhibitor, hardened and denaturated casein at concentration 20 mas. p. per 100 mas. p. polyetherpolyol were added. Composition can also contain halogenated esters of phosphoric acid. EFFECT: improved method of polyurethane foam preparing. 8 cl, 4 tbl