A simple method for preparing flame retardancy EVA/POE‐g‐MAH composites with high tensile strength by modified magnesium hydroxide and aluminum hydroxide

AbstractFor obtaining flame retardant, oil resistance, high strength, and softness EVA/POE‐g‐MAH composites for cables, multifunctional modified magnesium hydroxide (MH‐KH570), and aluminum hydroxide (ATH‐KH570) were prepared by grafting γ‐(methacryloyloxy) propyltrimethoxysilane (KH570) onto the surface of MH and ATH. The successful grafting was confirmed by Fourier‐transform infrared spectrometer, scanning electron microscope, thermogravimetric analysis, and contact angle test. The hydrophobicity of MH and ATH was enhanced and the decompose time was extended, called the “sustained release” effect. The ethylene‐vinyl acetate copolymer (EVA)/maleic anhydride grafted polyolefin elastomer (POE‐g‐MAH) composites containing 62.5 wt% the mixture of MH‐KH570 and ATH‐KH570 in a 1:1 mass ratio was prepared. The vertical combustion test, limited oxygen index (LOI), and cone calorimetry proved the flame retardancy performance of the EVA/POE‐g‐MAH composites were enhanced, because of the homogeneous dispersion and the “sustained release” effect of MH‐KH570 and ATH‐KH570. The vertical combustion and LOI reached V‐0 and 38.1%. Importantly, the “crosslinking” effect of MH‐KH570 and ATH‐KH570 further enhanced the tensile strength after the composites crosslinked, and reached 19.9 MPa. In a word, a simple method for preparing flame retardant EVA/POE‐g‐MAH composites with high tensile strength was provided.