A low-voc halogen-free flame-retardant polyolefin cable material for locomotives

Abstract

The invention discloses a low-VOC halogen-free flame-retarding polyolefin cable material used for locomotives, which is composed of: 55-95 parts of an ethylene-vinyl acetate copolymer, 0.2-0.4 parts of an ethylene-maleic anhydride copolymer, 5-45 parts of polyethylene, 0.7-2 parts of ZnO, 120-165 parts of a halogen-free flame-retardant, 0.7-1.8 parts of a coupling agent, 1.5-3 parts of a crosslinking sensitizer, 1.4-2.4 parts of an antioxidant, 2-5 parts of a silicone master batch, and 0.5-1.2 parts of a lubricant. The cable material is low in TVOC value, has excellent anti-scraping white exposure effect and anti-oil effect, is excellent in direct current stability, is low-smoke and toxic-free, is environment-friendly and safe, and can be extruded rapidly. The cable material can be used for producing locomotive cables satisfying the standard EN50264 in requirement of CRRC.

Description

technical field [0001] The invention relates to the field of low-smoke, halogen-free, and flame-retardant cable materials, in particular to a low-VOC, halogen-free, and flame-retardant polyolefin cable material for locomotives. Background technique [0002] With the rapid development of the rail transit industry, the promulgation of EU ROHS and REACH environmental protection regulations, and the need for safety, the requirements for rail transit cables are getting higher and higher, and they must comply with GB / T 12528, TB / T 1484, EN 50264 Such as rolling stock cable standards, not only require locomotive cables safety, energy saving, high temperature resistance, oil resistance, halogen-free flame retardant, but also attach great importance to safety requirements. [0003] In September 2017, CRRC Changchun Railway Vehicles Co., Ltd. formulated the "Environmental Protection Control Requirements for Parts and Materials", which formulated the technical specifications for formal...

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Problems solved by technology

[0004] In general, because a large amount of inorganic flame retardants are added to the low-smoke halogen-free flame retardant mixture, in order to improve the compatibility between the inorganic flame retardants and the resin, it is necessary to add maleic anhydride grafts and coupling agents to Solved, however, the maleic anhydride graft contains a large amount of incompletely reacted maleic anhydride and other small molecules, which caused the index to exceed when testing TVOC

[0005] Without the addition of maleic anhydride grafts, the compatibility between the inorganic flame retardant and the resin in the mixture cannot reach a high degree of compatibility even if there is a coupling agent. Such a product It is easy to cause the problem of rubbing, scratching and whitening, and the problem of DC stability passing but not affecting the normal use of locomotive cables

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