EPOXY COMPOSITION FOR UNDERWATER APPLICATION Russian patent published in 2023 - IPC C09D163/02 C09D5/16 

FIELD: polymer coatings.

SUBSTANCE: epoxy composition for underwater application to a concrete or steel surface to form a protective polymer coating with high adhesive strength, which is used in hydraulic engineering and repair works, chemical, petrochemical industries. The epoxy composition consists of component A and component B. Component A includes a mixture of epoxy resins, Laproxide 703, modifier 1 and a mixture of pigments with zinc phosphate. Component B includes an aliphatic amine and modifier 2. The epoxy resin mixture is a diane resin with different molecular weights. Modifier 1 is a solution of 3-glycidoxypropyltrimethoxysilane in ethyl silicate grade ES-40 or ES-32. Modifier 2 is a solution of benzalkonium chloride and salicylic acid anilide in propyl butyl solvent at a mass ratio of benzalkonium chloride and salicylic acid anilide equal to 8:1. The mass ratio of components A and B is from 5:1 to 5.3:1.

EFFECT: multiple increase in the adhesion strength of the coating to steel or concrete through the use of low-viscosity modifiers.

1 cl, 3 tbl, 10 ex