High-flame-retardant thermoplastic low-smoke halogen-free polyolefin material

Abstract

The invention relates to a high-flame-retardant thermoplastic low-smoke halogen-free polyolefin material. The material comprises the following components in percentage by weight: 10-20% of EVA, 5-15%of POP, 5-10% of a compatilizer, 45-60% of a mixture containing a hydromagnesite flame retardant and a surface treatment agent, 5-8% of a phosphorus-nitrogen flame retardant, 1-2% of a lubricant and 0.5-1.5% of an antioxidant. According to the material provided by the invention, the EVA and the POP are adopted as a resin main body through collocation, and excellent physical property and flexibility are achieved; the hydromagnesite is used as the main flame retardant, the hydromagnesite starts to decompose and releases water at 220 DEG C, an endothermic reaction is carried out, and heat of about 1,000 J / g is absorbed, so that the surface temperature of the material is effectively reduced, the material is prevented from being degraded quickly; and meanwhile, the hydromagnesite can accumulateon the surface of the material during a combustion process to form a stable cement-like hard shell layer, so that the supply of oxygen is blocked, and then the combustion process is prevented from further spreading; and the phosphorus-nitrogen flame retardant is adopted as an auxiliary flame retardant, so that the flame-retardant effect is greatly improved.

Description

technical field [0001] The invention relates to the field of flame retardant materials, in particular to a high flame retardant thermoplastic low-smoke halogen-free polyolefin material. Background technique [0002] Thermoplastic low-smoke halogen-free flame-retardant polyolefin cable compound is a kind of cable compound that meets the RoHS directive and Reach regulations. It uses polyolefin as the base material and adds flame retardants, antioxidants, modifiers and other additives after mixing plastics. Made of granulation. The temperature resistance grade is 90°C. Widely used in power cables, communication cables, control cables, optical cables, subway cable insulation or sheathing, electronic wires, automotive wires, etc. [0003] General low-smoke halogen-free flame-retardant polyolefin cable materials use hydroxide flame retardants. Although the flame-retardant effect is good due to the amount and ratio, it can only meet general flame-retardant requirements, and high ...

AI Technical Summary

Problems solved by technology

[0003] General low-smoke halogen-free flame-retardant polyolefin cable materials use hydroxide flame retardants. Although the flame-retardant effect is good due to the amount and ratio, it can only meet general flame-retardant requirements, and high flame-retardant Material requirements cannot be met

The flame retardant wires made of general low-smoke halogen-free flame-retardant polyolefin cable materials can pass the IEC60332 single vertical burning test and the IEC60332-3C bunching burning test, but it is difficult to pass the IEC60332-3A or B bunching burning test test

For CMR, CMP, etc. used for communication cables, it is even more impossible to pass