Preparation and flame retardancy of nitrogen and phosphorus containing flame retardant of N@PGS-AlHP for EVA composite

Abstract

A novel organic@inorganic-inorganic hybrid flame retardant named N@PGS-AlHP (where PGS = palygorskite, AlHP = aluminum hypophosphite) which could increase simultaneously the interfacial interaction and the flame retardancy of EVA was prepared. The EVA was mixed with N@PGS-AlHP and expandable graphite (EG) to enhance its flame retardancy. FTIR, XRD, SEM and TGA confirmed that AlHP had been precipitated on the palygorskite and PGS-AlHP was grafted by O-carboxyl benzoyl octadecylamine which was prepared by the reaction of octadecylamine and phthalic anhydride successfully. The results of flame retardancy test showed that the prepared composite of EVA/N@PGS-AlHP/EG obtained the highest LOI value of 40.1% with additives of 30 wt% of flame retardants of N@PGS-AlHP/EG. The EVA/N@PGS-AlHP/EG composite obtained the highest residue mass (61.4 wt%) after combustion, which was due to the introduction of the AlHP flame retardant and N element. The char residue could contribute to enhance the flame retardancy of EVA composite.