High-flame-retardant cold-resistant low-smoke halogen-free cable material and preparation process thereof

Abstract

The invention belongs to the field of cable materials, and particularly relates to a high-flame-retardant cold-resistant low-smoke halogen-free cable material and a preparation process thereof. The cable material comprises, by weight, 30 to 40 parts of low-density polyethylene, 20 to 25 parts of vulcanized TPE, 15 to 20 parts of ethylene-vinyl acetate copolymer, 2 to 5 parts of TMPTMA, 1 to 2 parts of DCP, 10 to 15 parts of active magnesium hydroxide, 15 to 25 parts of aluminum hydroxide, 10 to 25 parts of calcium carbonate, 15 to 20 parts of diisodecyl adipate, 5 to 10 parts of hexamethylphosphoramide, 15 to 25 parts of nano silicon dioxide, 5 to 10 parts of montmorillonite, 5 to 10 parts of a lubricant. 1 to 5 parts of an antioxidant, 2 to 5 parts of a calcium-zinc heat stabilizer and 5 to 8 parts of triphenyl phosphate. Through optimal design of formula components, the heat resistance, cold resistance, aging resistance and flame retardance of the low-smoke halogen-free cable material are greatly improved, and meanwhile, the processability, mechanical strength and electrical property of the low-smoke halogen-free cable material are also obviously improved.

Description

technical field [0001] The invention belongs to the field of cable materials, and in particular relates to a high flame-retardant, cold-resistant, low-smoke, halogen-free cable material and a preparation process thereof. Background technique [0002] At present, the manufacturing standards of high-speed rail locomotive wires and cables mainly refer to the Chinese iron standard TB / T 1484-2010 (mainly refer to the European standard). This standard requires high flame retardancy and weather resistance. At the same time, in the field of cable materials, the main problem is cold resistance. Poor performance, especially in low temperature load elongation and so on. [0003] From a global perspective, the output of polyethylene currently ranks first. Polyethylene plastic particles have good physical and mechanical properties and are widely used in various fields. However, due to its poor low-temperature environmental stress crack resistance, especially low-temperature tensile stre...

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Problems solved by technology

[0004] The existing low-smoke halogen-free flame-retardant polyethylene cable materials generally have the following defects: 1) Conventional halogen-free low-smoke polyethylene flame-retardant cable materials use ethylene-vinyl acetate copolymer, polyethylene, aluminum hydroxide, magnesium hydroxide, The surface hardness of the prepared cable material is relatively high (Shore A hardness is not less than 90), and the flexibility is relatively poor at room temperature and obviously worse at low temperature, which leads to easy cracking or even embrittlement of wires and cables, which cannot meet the use requirements; 2) The flame retardant grade of conventional halogen-free low-smoke polyethylene flame-retardant cable materials is not up to the standard; 3) Due to the high viscosity of conventional halogen-free low-smoke polyethylene flame-retardant cable materials, it is easy to cause poor surface finish of wires and cables during extrusion molding

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