A flame-retardant, age-resistant ethylene propylene copolymer composition and a process for its preparation

Abstract

This invention relates to the technical field of polyolefin insulation materials for wires and cables, specifically to a flame-retardant and anti-aging ethylene-propylene copolymer composition and its preparation method. The composition uses ethylene-propylene copolymer as a matrix, introduces an organophosphorus flame retardant composed of aluminum phosphinate and melamine polyphosphate, which synergistically retards the flame with a magnesium-aluminum layered double hydroxide treated with organosilane / fatty acid salts. A multi-component anti-aging system containing hindered phenols and phosphites is employed, with some anti-aging components pre-adsorbed onto the surface of fumed silica nanofillers. Simultaneously, an ethylene-propylene graft compatibilizer containing maleic anhydride groups is added. The composition is formed through a two-step melt blending and granulation process using a flame-retardant masterbatch. This material meets flame-retardant requirements while exhibiting a high oxygen index and good drip suppression effect. It also demonstrates excellent retention of mechanical and electrical properties after thermal aging, making it suitable for cable sheaths and insulation layers in long-term service.

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