ANTICORROSION PROTECTIVE POLYMERIC COATING Russian patent published in 2003 - IPC

FIELD: polymers. SUBSTANCE: invention relates to anticorrosion protective two-member coating systems comprising priming film and external coating. Anticorrosion protective coating consists of the first member of two-member priming composition comprising solution in organic solvent modified with amine modifying agent of epoxy base of priming composition and amine hardening agent modified with epoxy modifying agent of amine in organic solvent solution. The second member is external polyurethane coating comprising homogenous adduct prepared by interaction of epoxy oligomer or oligomers with epoxy number 3.1- 3.9 mg x eq/g, 27-44 wt.-%, mixture of aromatic amines with amine number of mixture 9-10.4 mg x eq/g, 31.5- 50.5, and coal resin with viscosity value 18-25 sSt and basicity 1.3-1.5 mg x eq/g HCl, 17.5-31.5, and isocyanate hardener providing hardening of indicated component. Ratio of component in priming film and external coating provides the following indices: adhesion after 1 000 h of exposition in water at 60 C is 4.5-7.5; resistance to cathode exfoliation after exposition in 3% NaCl solution at 60 C for 30 days is 3.0-8.0 cm². Invention can be used for protection of metallic pipes working under rigid conditions of exploitation. EFFECT: enhanced and valuable properties of coating. 5 cl, 7 tbl