METHOD FOR APPLICATION OF PROTECTIVE COATING OF POLYURETHANE TO PRODUCTS OF CARBON COMPOSITE Russian patent published in 2023 - IPC C09D175/00 C09D175/04 C09D175/08 C08G18/10 C08G18/48 B05D1/00 

FIELD: material processing.

SUBSTANCE: present invention relates to a method for application of a protective composition of polyurethane to products of carbon composite; it can be used in the application of a composition to increase a service life of products of carbon composite, when operating under extreme conditions. The method includes mixing of components A and B of a two-component polyurethane system by quantitative transfer of the component B to the component A at a ratio of 1:5, dissolution with a solvent, preparation of a surface of a product of carbon composite by processing with fine-grained sandpaper, spraying of at least one layer of the protective composition on the entire surface of the product, drying of the protective composition, at least one flaw detection, and additional polymerization. The component A of the polyurethane system consists of prepolymer based on polyester and toluene diisocyanate, and technical carbon, which is fine-dispersed powder, moisture content in which is no more than 3% of the weight. The component B consists of an amine hardener of urethane polymers, liquid low-molecular polyethylene glycol, and diethyl toluene diamine.

EFFECT: invention provides for an increase in a service life of products of carbon composite, as well as increase in the efficiency of processing of the surface during the application of the protective composition.

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