FIELD: chemistry.
SUBSTANCE: proposed is a binding coating which is formed on the surface of a base or priming film before formation of an antifouling coating film based on organosiloxane from moisture-hardening composition based on organosiloxane containing (b1) organopolysiloxane with condensable functional groups on both ends of molecules and/or (b2) a hardening composition obtained from contact processing with heating or without heating component (b1) and filling pigment selected from a group consisting of silicon dioxide, calcium carbonate, talc, mica, clay, kaolin and barium sulphate and (b3) a silane coupling agent. Also proposed is a composite coating film, where on the surface of the said binding coating a finishing coating is formed from a hardening three-component type composition based on organopolysiloxane, where the said finishing coating contains (c1) a main component which contains component (b1), (c2) a hardening component containing tetraalkoxysiliate or its condensate, and (c3) a component which accelerates hardening, containing a metal compound. A composite coating film is proposed, where an epoxy based seal coating, the binding coating and the finishing coating are formed in that order on the surface of an old antifouling coating film (G). The proposed binding coating allows for formation of a composite coating film with excellent layer bonding properties. The composite coating film sits well on the surface of the base, on a priming film, on an old antifouling coating film etc, has excellent bonding strength between layers and can resist fouling. The coating film is mainly used for coating outer surfaces of ships, parts of marine structures immersed in water, channels for inlet and outlet of water in atomic power stations etc.
EFFECT: design of a binding coating through which a base or an underlying layer can be strongly bonded to an antifouling coating film based on organopolysiloxane, which become the outer layer after deposition.
36 cl, 7 tbl
