FIELD: chemistry.
SUBSTANCE: invention relates to an intumescent coating composition comprising a polyisocyanate, a polyfunctional isocyanate-reactive compound and an intumescent ingredient. Intumescent ingredient contains at least one or more compounds containing phosphorus, nitrogen and boron atoms, so that the weight ratio phosphorus to nitrogen in said intumescent ingredient is between 0.5/1 to 1.5/1, and the amount of boron is from 1 to 5 wt% based on the coating composition. Process for forming a cured intumescent substance, a cured intumescent substance, polyisocyanate composition for use in a coating composition, and a polyfunctional composition for use in a coating composition are also described.
EFFECT: technical result is providing a quick-drying, fast-curing intumescent polyurethane coating that can compete with epoxy and acrylics based intumescent systems.
15 cl, 3 tbl, 2 ex
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