High-temperature-resistant soft thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material

Abstract

The invention discloses a high-temperature-resistant soft thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material, and belongs to the technical field of cable sheath or insulation high-molecular material. The high-temperature-resistant soft thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material is composed of 100 parts of a matrix resin, 100 to 150 parts of inorganic fire retardant, 3 to 10 parts of a flame-retardant synergistic agent, 1.0 to 2.0 parts of a silane coupling agent, 0 to 0.1 part of a peroxide, 1 to 4 parts of a lubricant, and 2.0 to 4.0 parts of an anti-oxidant; the matrix resin is composed of, by weight, 25 to 60 parts of an ethylene copolymer, 20 to 55 parts of an alkene segmented copolymer, and 10 to 25 parts of a compatilizer. The flame resistance and softness of the high-temperature-resistant soft thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material are ensured; the high-temperature-resistant soft thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material prepared via blending possesses excellent heat resistance and low temperature performance; material mechanical performance is ensured; and material hardness is reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials for wire and cable sheathing or insulation, and specifically relates to a high-temperature-resistant soft thermoplastic low-smoke halogen-free flame-retardant polyolefin cable material. Background technique [0002] The thermoplastic low-smoke, halogen-free, flame-retardant polyolefin cable materials in the prior art generally use PE / EVA as the main base material, and a large amount of inorganic flame retardant is added, and the hardness exceeds 95A, which makes the obtained cable feel stiff and difficult to completely reverse. , easy to crack. A typical example is CN1796450A (a low-smoke halogen-free flame-retardant polyolefin cable compound and its preparation method). [0003] Using ethylene-octene copolymer elastomer or ethylene-butylene copolymer elastomer can improve the flexibility of thermoplastic low-smoke halogen-free polyolefin cables, but because the melting point of the eth...

AI Technical Summary

Problems solved by technology

However, at present, such organic flame retardants are often not resistant to precipitation and migration resistance, especially after long-term hot water soaking (70℃*168h), they are easy to precipitate, and the materials are difficult to meet the requirements of low-smoke halogen-free cable materials in GB / T32129-2005 Requirements for the change rate of mechanical properties after immersion in water, and its cost is much higher than that of inorganic flame retardants

[0005] There are also related researchers who use propylene-based elastomers to improve the softness of materials, such as the Chinese patent authorization announcement number CN101397380B (a high-temperature-resistant, soft, low-smoke, halogen-free, flame-retardant polyolefin cable material). This type of elastomer can improve the flexibility of materials. It can also increase the heat resistance level of thermoplastic low-smoke halogen-free polyolefin cable materials from the usual 70°C and 90°C to 105°C, but this type of propylene-based elastomer has the following insurmountable defects that lead to its application Due to the above limitations, the glass transition temperature of propylene-based elastomers is mostly -30°C to -20°C, while the glass transition temperature of PE is about -70°C, and POE, which is commonly used in low-smoke, halogen-free polyolefin cable materials, is at -60℃~-40℃, so the embrittlement temperature of propylene-based elastomer is much higher than that of POE and PE

As a result, the low-temperature performance of the prepared cable material is poor, and it is difficult for the prepared cable to pass the winding test and low-temperature tensile test at a temperature of -40°C or lower. Hardened, brittle or even cracked, limiting the scope of use of the cable

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