METHOD OF PREPARING RIGID POLYURETHANE FOAM Russian patent published in 1999 - IPC

FIELD: chemical industry. SUBSTANCE: rigid polyurethane foam is prepared by reacting polyisocyanate with polyether component based on tallow oil and triethanol amine in the presence of oxyalkylenedimethylhydroxy siloxane block copolymer. Polyether components hydroxyl containing compound with hydroxyl number of 270-340 mg KOH/g prepared by reaction of tallow oil with triethanol amine using weak acid catalyst based on vegetable and organosilicon oils with addition of (tri-)tetraamine and saturated hydrocarbons. EFFECT: improved physical- mechanical characteristics and reduced friability of the desired product. 3 cl, 6 ex, 1 tbl