Halogen-free high-flame-retardant cable

Abstract

The invention discloses a halogen-free high-flame-retardant cable. An insulation layer of the cable comprises an outer insulation layer and an inner insulation layer which are formed by a double-layer coextrusion method. The tension strength of the outer insulation layer is larger than or equal to 13.8MPa, the broken elongation of the outer insulation layer is larger than or equal to 300%, and the inner insulation layer is made of high-flame-retardant rubber materials. The outer insulation layer comprises 100 parts of vinyl copolymer and/or ethylene propylene diene monomer rubber, 60-150 parts of halogen-free flame retardant, 1-10 parts of compatilizer, 0.1-5 parts of antioxidants, 0.1-5 parts of lubricants, 0-20 parts of polymer elastic bodies and 0-3 parts of coupling agents. The inner insulation layer comprises 100 parts of vinyl copolymer and/or ethylene propylene diene monomer rubber, 80-250 parts of halogen-free flame retardant, 1-10 parts of compatilizer, 0.1-5 parts of antioxidants, 0.1-5 parts of lubricants, 0-20 parts of polymer elastic bodies and 0-3 parts of coupling agents. The cable is stretch-resistant, excellent in waterproof performance and abrasion resistance and high in flame-retardant level.

Description

technical field [0001] The invention relates to a halogen-free high flame-retardant cable, in particular to a halogen-free high flame-retardant double-layer co-extruded cable. Background technique [0002] The US UL1581 standard stipulates that wires of various wire gauges must meet the flame retardant standard of FT-2 or VW-1, and also limit the mechanical properties, such as wires with a temperature resistance of 125°C and 150°C, and a tensile strength of ≥13.8Mpa , elongation at break ≥ 300%; now all wire manufacturers at the FT-2 level can easily solve the problems of flame retardancy and mechanical properties. However, if it is necessary to meet the VW-1 flame retardant standard, especially for electronic wires with smaller wire gauges, such as AWG18-AWG24, it is rare for halogen-free flame retardants to reach VW-1; because the flame retardant level of VW-1 must be achieved. , then a large amount of flame retardant is bound to be added to the material formula, which in...

AI Technical Summary

Problems solved by technology

However, if it is necessary to meet the flame retardant standard of VW-1, especially for electronic wires with smaller wire gauges, such as AWG18-AWG24, it is rare for halogen-free flame retardant to reach VW-1; because it is necessary to achieve the flame retardant level of VW-1 , then a large amount of flame retardant is bound to be added to the material formula, which in turn leads to a sharp decline in the mechanical properties of the material, especially the elongation at break is far below the requirement of 300%.