FIELD: chemistry of polymers.
SUBSTANCE: invention relates to using polyurethane reactive bicomponent solvent-free composites used for preparing thermostable at temperature below 90°C and compatible with cathode protecting covers. The composite comprises the following components: (A) solvent-free polyhydroxy-component consisting of (A1) 40-100 weight % of simple polyetherpolyol with functionality index ≥ 3.5 and molecular mass 280-1000 Da, or a mixture of some such components, and also (A2) 0-60 weight % of simple polyetherpolyacrylate with from 5.0 to 15 weight % of hydroxyl groups and viscosity index from 300 to 5000 mPa x s at 23°C, and also (A3) 0-60 weight % of other hydroxyl-containing groups of compounds of molecular mass from 32 to 1000 Da and wherein the weight % sum (A1)-(A3) is 100% always, and (B) polyisocyanate component consisting of at least one organic polyisocyanate wherein the equivalent ratio NCO : OH is in the range from 0.8:1 to 1.5:1. Invention provides preparing covers with high permissible prolonged temperature loading below 90°C for protection against corrosion in simultaneous compatibility with cathode protection.
EFFECT: improved and valuable properties of systems.
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