Synergistic flame-retardant low-smoke halogen-free polyolefin cable material and preparation method thereof

Abstract

The invention discloses a low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof. The formula of the cable material comprises the following raw materials in percentage by weight: 20-30% of ethylene-vinyl acetate copolymer, 10-20% of linear low-density polyethylene, 3-6% of compatilizer, 50-60% of inorganic flame retardant, 2-5% of synergistic flame retardant, 0.5-1% of coupling agent, 0.2-0.5% of lubricant and 0.2-0.5% of antioxidant. The preparation method of the cable material comprises surface treatment of the inorganic flame retardant, burdening,mixing, milling, extrusion and granulation and other process steps. Compared with the prior art, the cable material disclosed by the invention has the advantages of superior flame retardancy, low smoke, low toxicity, no droplets, good processing performance, good dispersion of the inorganic flame retardant, and better uniformity and surface finish degree.

Description

technical field [0001] The invention relates to a polymer for wires and cables, in particular to a low-smoke, halogen-free, flame-retardant polyolefin cable material and a preparation method thereof. Background technique [0002] The existing conventional halogen-free flame-retardant polyolefin cable materials still follow the traditional technical route of adding a large amount of inorganic flame-retardant materials, but adding a large amount of inorganic flame-retardant materials will affect the mechanical and electrical properties of the material itself, making the material lack of flexibility. It is easy to crack, the tensile strength and elongation at break decrease significantly, the volume resistivity and breakdown strength decrease, and the dielectric loss increases significantly, thus limiting its application in special environments. Contents of the invention [0003] The object of the present invention is to provide a polyolefin cable compound which does not cont...

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Problems solved by technology

[0002] The existing conventional halogen-free flame-retardant polyolefin cable materials still follow the traditional technical route of adding a large amount of inorganic flame-retardant materials, but adding a large amount of inorganic flame-retardant materials will affect the mechanical and electrical properties of the material itself, making the material lack of flexibility. It is easy to crack, the tensile strength and elongation at break decrease significantly, the volume resistivity and breakdown strength decrease, and the dielectric loss increases greatly, thus limiting its application in special environments

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