POWDER COATING COMPOSITION FOR COATING PIPES Russian patent published in 2011 - IPC C08G59/30 C09D163/00 C09D163/04 C09D5/03 C08L63/02 C08L63/04 C08K3/38 

FIELD: chemistry.

SUBSTANCE: composition contains a homogeneous mixture consisting of at least one bromine-functionalised epoxy resin, at least one epoxy curing agent and at least one pigment, filler and/or coating additive. Content of bromine in the bromine-functionalised epoxy resin is equal to 5-60%. The composition also contains alkanol amine and at least one zinc borate compound. Alkanol amine is selected from a group consisting of diethanol amine and tris(hydroxymethyl)aminomethane. The method of preparing the composition involves mixing components, heating to melting point of the mixture, extrusion of the molten mixture, cooling, crushing and grinding to powder. The composition provides a coating with high glass transition temperature and acceptable flexibility when depositing the coating onto a metallic or plastic base, in particular metallic and plastic pipes.

EFFECT: coatings can have high adhesion in hot and humid conditions and optimum short-term and long-term protection from cathodic disbonding at high temperature and humidity.

14 cl, 3 tbl, 7 ex