Low-smoke halogen-free flame retardant thermoplastic elastomer alloy for flexible wire rod and preparation method thereof

Abstract

The invention discloses a low-smoke halogen-free flame-retarding thermoplastic elastomer alloy used for soft wires and a preparation method of the alloy, which is characterized in that: the material comprises thermoplastic polyurethane elastomer, thermoplastic styrene elastomer, compatilizer, phosphorus-nitrogen compound flame retardant, flame-retarding potentiating agent, lubricant, antioxidant and colorant; the weight ratio of the thermoplastic polyurethane elastomer, the thermoplastic styrene elastomer, the compatilizer, the phosphor-nitrogen compound flame retardant, the flame-retarding potentiating agent, the lubricant, the antioxidant and the colorant is 40 to 55 : 5 to 25 : 5 to 10 : 20 to 25 : 3 to 10 : 1.5 : 0.25 : 0.25; the preparation method is that the all components are evenly mixed in a high-speed mixer, and then extruded, drew and granulated at 170 to 210 degree centigrade, and then a low-smoke halogen-free flame-retarding thermoplastic elastomer alloy used for soft wires is obtained. The low-smoke halogen-free flame-retarding thermoplastic elastomer alloy used for soft wires has the advantages of achieving distinct flame-retarding effect at a small quantity of flame retardant dosage, satisfying the flame-retarding requirement of low-voltage wires, adjusting the Shore durometer number of the material between 80 to 95, good pliability, high physical mechanical property and according with the halogen-free and environment-friendly requirement.

Description

technical field [0001] The invention relates to a low-smoke, halogen-free, flame-retardant thermoplastic elastomer alloy for soft wires and a preparation method thereof. Relevant processing aids are blended and granulated to produce a low-smoke, halogen-free, flame-retardant thermoplastic elastomer alloy for soft wire rods that meets environmental protection requirements. Background technique [0002] As we all know, one of the most used materials in the wire and cable industry is PVC, which is a polymer material with a chlorine content of 60%. A large amount of other harmful substances are also added in the manufacturing process of wire and cable materials. When PVC material is burned, it will produce smoke containing toxic gases such as hydrogen halide and carbon monoxide. The most strongly opposed to the application of PVC are Switzerland, Germany, Sweden, the United States, Japan and other countries. The legislative bodies and coordination agencies of these countries ha...

AI Technical Summary

Problems solved by technology

When such materials replace PVC materials and are used in low-voltage wires such as electrical wires, electronic wires, signal wires, earphone wires, audio wires, computer cables, and USB wires, there are mainly three shortcomings: First, this type of low-smoke Halogen-free flame-retardant polyolefin materials are materials filled with a large amount of metal hydroxide, the filling amount is more than 60%. During the post-processing process after extruding the wire rod, it is easy to scratch and scratch, resulting in flaws in the appearance; the second is Due to the low flame retardant efficiency of metal hydroxide flame retardants, when applied to some wires and cables with complex structures and thick walls, the flame retardant test of the wire can reach the UL1581: VW-1 flame retardant grade, but it is not suitable for thin walls. The electronic wire cannot reach UL1581: VW-1 flame retardant grade; the third is that this kind of low-smoke halogen-free flame-retardant polyolefin material is filled with a large amount of metal hydroxide, and the Shore A hardness is often above 95, which cannot meet the electronic requirements. Requirements for softness of low-voltage wires such as wires and signal wires