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

FIELD: thermoinsulating materials. SUBSTANCE: at preparing elastic polyurethane foam by reaction of polyol and polyisocyanate in the presence of swelling graphite, amine activating agent, stabilizer and water swelling graphite is mixed preliminary with melamine at the mass ratio (1.5-2):3, respectively, at the total graphite and melamine concentration 20-40% of reaction mixture mass. Graphite and melamine were added first to polyol part, and amine activating agent, stabilizer and water were added to the second part of polyol. Also, fireproofing agent is added to polyol containing graphite and melamine. Swelling graphite particle size can be from 0.2 to 100 mm. EFFECT: improved method of polyurethane foam preparing. 2 dwg, 3 tbl