Low-smoke halogen-free flame retardant high-elongation-rate polyolefin cable material for bullet train and preparation method of polyolefin cable material

Abstract

The invention discloses a low-smoke halogen-free flame retardant high-elongation-rate polyolefin cable material for a bullet train. The polyolefin cable material is prepared from the following raw materials in parts by weight: high-density polyethylene, linear low-density polyethylene, a flame retardant, silicon dioxide, ethylene-vinyl acetate graft maleic anhydride copolymer, an elastomer, an antioxidant and a lubricant. The invention further discloses a preparation method of the polyolefin cable material. The preparation method comprises the following steps: adding prepared polyolefin and an assistant into a high-speed mixer, mixing at the speed of 1,000-1,500r / min for 5-10 minutes, and mixing and granulating by virtue of a double-screw extruder at 150-170 DEG C to obtain the polyolefin cable material. The polyolefin cable material has the advantages of high elongation rate, low smoke, no halogen, flame retardancy, no toxics and the like, and specifically can be used for manufacturing wires and cables for the bullet train with the speed of 350km / h.

Description

technical field [0001] The invention belongs to the field of polymer material technology and science, and relates to a wire and cable material, in particular to a low-smoke, halogen-free, flame-retardant, high-elongation polyolefin cable material for motor vehicles and a preparation method thereof. Background technique [0002] At present, the domestic wire and cable products for high-speed trains with a speed of 350 KM or more mainly rely on imported European products, such as NEXANS, HVBER+SUHNER, PRYSMIAN and Japanese products, which cannot be fully realized in China. Localization. [0003] According to Chinese Railway Standards, European Standards and Japanese Standards, wires and cables for 350KM EMUs include two types of standard wall thickness and thin wall, as well as their corresponding single-core and multi-core structures. The domestic railway standard is adopted for the production speed below 350KM per hour, while the Japanese standard or European standard is ad...

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Problems solved by technology

[0005]2) Toxicity test requirements: iron standard ≤ 5, Japanese standard ≤ 1, European standard ≤ 3, Japanese standard because the test method is different from the iron standard and European standard, It is not comparable, but the test method of the iron standard is the same as that of the European standard, and it is difficult for domestic materials to meet this requirement

[0006]"A low-smoke halogen-free flame-retardant polyolefin cable material and its preparation method" (patent application number CN 1445793A) prepared a cable material, but due to its high Filling, the dispersion performance of inorganic powder in the matrix is ​​poor, and the flexibility of the material is poor

"A low-smoke, halogen-free, flame-retardant polyolefin cable compound and its preparation method" (patent application number CN 1796450A) uses plastics such as ethylene vinyl acetate and high-density polyethylene compounded with inorganic powder, and solves the compatibility problem , improving the dispersion performance of inorganic powder, but neither of these two patents involves the toxicity of smoke generated during combustion and meets the requirements of cables for motor vehicles with speeds above 350KM per hour

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