POLYOL COMPOSITION FOR OBTAINING RIGID FOAMED POLYURETHANES OF HEAT INSULATION PURPOSE

摘要

FIELD: chemistry. ^ SUBSTANCE: invention concerns compositions reactive towards isocyanate, applied for obtaining rigid foamed polyurethanes of heat insulation purpose. Invention claims polyol composition including (wt %) four polyols as polyol reagent: reaction product of propylene oxide with aqueous ethylenediamine solution with hydroxyl value within 729-800 mg of KOH/g and dynamic viscosity within 1500-2000 mPa.s at 50°C .- Lapromol 294 (0.4-0.8); simple polyether based on propylene oxide and glycerin with hydroxyl value of 480 mg of KOH/g and dynamic viscosity within 400-500 mPa.s at 25°C - Laprol 373 (6.5-8.5); sucrose polyether product of oxypropylation of sucrose and water mix with hydroxyl value within 400-450 mg of KOH/g and dynamic viscosity within 2000-3000 mPa.s at 25°C - Polyur A-01 or simple polyether based on propylene oxide and sucrose system with hydroxyl value within 465-515 mg of KOH/g and dynamic viscosity within 7500-11500 mPa.s at 25°C - Laprol ES-564 (28.0-36.0); polyether from polyol mix with hydroxyl value within 329-461 mg of KOH/g and 60 s viscosity by viscosity gauge VZ-246 at 20°C - Polyur AZ-20 grade A (14.0-25.0); and additionally including antipyrene additive of tri-(beta-chlorethyl)phosphate (the rest). ^ EFFECT: obtaining polyol composition preserving reactivity towards isocyanate during long storage time, obtaining rigid polyurethane with improved durability properties maintaining required density. ^ 1 cl, 2 tbl, 4 ex