Cracking-resistant thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material

Abstract

The invention relates to a cracking-resistant thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material, and aims at providing a cable material of which mechanical and physical properties and cracking resistance can be significantly improved. The cable material adopts the technical scheme that the cracking-resistant thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material comprises the following components in parts by mass: a) 100 parts of matrix resin comprising 25-65 parts of ethylene-vinyl acetate copolymer, 10-40 parts of metallocene linear low density polyethylene, and 10-35 parts of interfacial compatibilizer, b), 160 parts of fire retardant comprising 60-120 parts of aluminium hydroxide and 40-100 parts of magnesium hydroxide, c) 0-2 parts of lubricant, d) 0.5-2.5 parts of antioxygen, e) 0.05-0.15 parts of silane coupling agent, f) 0.01-0.03 parts of initiating agent, and g) 0.01-0.03 parts of catalyst, wherein the content of vinyl acetate in the ethylene-vinyl acetate copolymer is greater than or equal to 26%.

Description

technical field [0001] The invention relates to a cable material, in particular to the formula of the anti-cracking thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material used in large-section cables. Background technique [0002] At present, low-smoke and halogen-free cable materials are required to be used in some densely populated public places such as subways, ships, power stations, high-rise buildings, etc. that require high flame retardancy and low secondary hazards. The low-smoke and halogen-free materials on the market mostly adopt the method of adding inorganic flame retardants to polyethylene and EVA base materials to achieve a balance between performance and flame retardant effect; compared with different resin base materials, the addition amount of inorganic flame retardants can vary Between 50-65%. High filling results in good flame retardant performance of the material, but at the same time reduces the mechanical and physical properties...

AI Technical Summary

Problems solved by technology

As a result, the material is difficult to process during use, the mechanical and physical properties of the cable are seriously reduced, and it is prone to cracking under harsh conditions.

[0003] Since the development of low-smoke and halogen-free materials, the phenomenon of cable cracking after cable formation still occurs in different occasions, which is an important reason why it still cannot completely replace PVC and PE sheath materials.

Although the cracking performance of the material can be improved by cross-linking, due to the constraints of cable standards, production process and cost, the complete cross-linking method is not practical and universal