The invention discloses a method for preparing polyethylene/aluminum diethylphosphinate masterbatch via in-situ graft polymerization. Steps: Silicon coating: Dilute aluminum diethylphosphinate into 20～50 wt% slurry, add sodium hexametaphosphate solution for high-speed dispersion, heat to 70～90℃, adjust pH to 7～10, add sodium silicate and sulfuric acid solution to maintain pH stability, stir and cure for 30‑60 min to obtain silicon-coated slurry; Silane coupling: Add 0.5～2 wt% emulsified vinyl silane coating agent into the slurry, stir, filter, wash, dry and crush to obtain silane-modified aluminum diethylphosphinate; In-situ grafting: Mix 70～80 wt% silane-modified flame retardant, 0.1～1 wt% initiator, 1～2 wt% polyethylene wax and 18.9～27 wt% polyethylene pellets uniformly in a high-speed mixer, then feed into a twin-screw extruder for in-situ graft polymerization, and perform air-cooling granulation after extrusion to obtain the target masterbatch.
Country Code: CN
Application Number: CN202410995420.1
