Self-crosslinking acrylic latexes with copolymerized flame retardant based on halogenophosphazene derivative

• Published in: Progress in organic coatings 2016-12, Vol.101, p.322-330
• Main Authors: Machotova, Jana, Zarybnicka, Lucie, Bacovska, Radka, Vrastil, Josef, Hudakova, Martina, Snuparek, Jaromir
• Format: Article
• Language: English
• Subjects: Acrylamide; Chemical synthesis; Coatings; Combustion; Cone calorimeter; Copolymerization; Core-shell latex; Core-shell particles; Crosslinking; Derivatives; Diacetone acrylamide; Emulsion polymerisation; Emulsion polymerization; Enthalpy; Flame retardant; Flame retardants; Flame stability; Latex; Methacrylic acid; Molecular structure; Molecules; Monomers; Phosphazene; Polymerization; Polymethyl methacrylate; Polymethyl methacrylates; Smoke; Synthesis
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2016.09.007

•Flame retardant of halogenophosphazene derivative was prepared by one-step synthesis.•Halogenophosphazene derivative acted as a crosslinker in emulsion polymerization.•Halogenophosphazene derivative increased flame stability of coatings.•One-package thermosetting transparent coating systems were developed. 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-cyclo-triphosphazene was synthesized by nucleophilic substitution of hexachloro-cyclo-triphosphazene with allyl amine. Latexes of functionalized core-shell particles bearing in the structure hexaallylamino-cyclo-triphosphazene molecules were prepared by the semi-continuous non-seeded emulsion polymerization of methyl methacrylate, butyl acrylate and methacrylic 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. 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 indicates a slower flame spread during the material combustion.