Synergistic effect of solid super acid on the properties of intumesce flame retardant EVA composites

摘要

@@Ethylene vinyl acetate (EVA) is copolymerization of ethylene and vinyl acetate, it is widely used in many fields because of its excellent properties, particularly in electrical engineering applications. It is easily flammable in the air due to its chemical composition. Especially, a mass of black smoke and toxic gas will be produced during EVA burning. And because of this, flame retardancy of EVA is widely studied. Among the many ways of halogen free flame retardation of EVA, using of intumescent flame retardants (IFR) has been considered to be a promising method. The efficiency and quality of char forming are of special importance, because it has close relation to the flame retardancy of IFR system. To improving the flame retardant efficiency, many ways were used. However, in all the reports on intumesce flame retardant of EVA, usage of Solid super acid to catalyzing forming char yields have not been concerned. The research on Solid super acid began in the 1980s. In 1979, for the first time, Arata and Hino synthesized SO42-MxOy solid super acid catalysts, which reveal remarkable catalytic performances in the isomerization of alkanes. Since then, these solid super acids receive much attention owing to their superior properties as well as the outstanding catalytic performances.