Poster 2: Self-crosslinkable latex with covalently linked flame retardent

摘要

In this study the synthesis of a novel flame retardant based on halogenophosphazene derivative and its application in waterborne coatings based on self-crosslinking latexes was investigated. Hexaallylamino-cycfo-triphosphazene was synthesized by nucleophilic substitution of hexachloro-cyclo-triphosphazene with allyl amine. Latexes of functionalized core-shell particles bearing in the structure hexaallytamino-cyclo-triphosphazene molecules were prepared by the semi-continuous non-seeded emulsion polymerization of methyl methacrylate, butyl acrylate and methacrytic acid as main monomers. For interfacial crosslinking, diacetone acrylamide was copolymerized into the shell layer of latex particles to provide sites for subsequent reaction with adipic acid dihydrazide. Because of the double bonds present in hexaallylamino-cyc/o-triphosphazene molecule, this kind of flame retardant can be incorporated into the structure of emulsion copolymers by radical copolymerization. The increasing concentration of hexaallylamino-cyc/o-triphosphazene was found to have the positive effect on the flame stability of coating systems and also increased the crosslinking density of latex particles. The incorporation hexaallylamino-cyclo-triphosphazene did not affect transparency, flexibility, toughness and adhesive properties of resulting coatings. Moreover, the presence of the novel flame retardant decreased water sensitivity and increased the flame stability of coatings in terms of reduced total heat release, decreased amount of released smoke and drop in maximum average rate of heat emission which indicated a slower flame spread during the material combustion.