| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to polyurethane composition used as a protective coating. The composition contains the following in pts. wt: 770 - polytetramethylene etherglycol with molecular weight of 1950, 200 - 4,4'-diphenylmethanediisocyanate, 80-100 - dimethylformamide, 36 - hydroxyl-containing compound, 100-120 - methylphosphite borate and 15-18 - glycidalmethacrylate. A prepolymer is synthesised first as an initial component by reacting polytetramethylene etherglycol and 4,4'-diphenylmethanediisocyanate in molar ratio OH:NCO-groups equal to 1:2. ^ EFFECT: composition has better complex properties, specifically high fire- and heat resistance and good physical and mechanical properties, eg high strength and extensibility. ^ 2 cl, 2 tbl |
