The present invention relates to the technical field of EPDM rubber, in particular to a high-strength, low expansion, flame-retardant EPDM rubber and its preparation method, comprising the following raw materials: EPDM rubber, carbon black, white carbon black, metal oxide, flame retardant composition, stabilizer, calcium carbonate, anti-aging agent, stearic acid, coupling agent; The flame retardant composition includes the following raw materials: nano aluminum hydroxide, nano magnesium hydroxide, nitrogen phosphorus flame retardant, and halogen-free flame retardant; The specific steps are as follows: sequentially place nano aluminum hydroxide, nano magnesium hydroxide, nitrogen phosphorus flame retardant, and halogen-free flame retardant into the mixer and stir evenly; Sequentially adding each raw material into the internal mixer for internal mixing to obtain a mixture; Squeeze the mixture into pellets through a twin-screw extruder. The present invention has the characteristics of high tensile strength, tear strength, high resistance to hot water, and low expansion, which can achieve smokeless combustion and self extinguishing upon ignition. It can effectively solve the current defects of low strength and high expansion of halogen-free flame retardant rubber when exposed to hot water.
Country Code: CN
Application Number: CN202311753715.X
