A low-smoke, low-halogen, flame-retardant and cold-resistant cable material, preparation method and cable sheath

Abstract

The invention discloses a low-smoke low-halogen flame-retardant cold-resistant cable material, a preparation material and a cable sheath. The formula of the raw materials of the cable material includes, by weight, 100 parts of PVC resin, 40-70 parts of organic cold-resistant plasticizer, 3-12 parts of inorganic flame retardant, 5-10 parts of inorganic antismoke agent, 40-80 parts of inorganic halogen hydride absorbent and 5-10 parts of processing agent, wherein the processing agent is a mixture of an acrylate-ethylene vinyl acetate grafted copolymer and an acrylonitrile-butadiene copolymer and / or a mixture of an acrylate-ethylene vinyl acetate grafted copolymer and chlorinated polyethylene. The mixture in the cable material has an effect of cold-resistant plasticizing of PVC resin and has an effect on compatible coupling of low-smoke low-halogen flame retardant; the cable material has a low-smoke low-halogen flame-retardant effect and a cold-resistant performance at -40 DEG C, and the mechanical performance of the cable material meets the performance use requirement of the cable material.

Description

technical field [0001] The invention belongs to the technical field of cables, and in particular relates to a low-smoke, low-halogen, flame-retardant and cold-resistant cable material, a preparation method and a cable sheath. Background technique [0002] In recent years, the development of wire and cable varieties has shown a trend of diversification. It has changed from pure power transmission function to multi-function, that is, new features have been added according to different uses, such as: low-smoke and zero-halogen, low-smoke and low-halogen, Cold-resistant, waterproof, rodent-proof, termite-proof, etc., in some special occasions, it is even required that the cable has two or more comprehensive characteristics. [0003] As people's awareness of cable fire accidents increases year by year, the flame retardancy of cables has also attracted much attention. Generally, flame-retardant cables can be divided into flame-retardant cables, low-halogen flame-retardant cables,...

AI Technical Summary

Problems solved by technology

However, when PVC burns, it will release halogen-containing substances, corrosive gas hydrogen chloride and other toxic black smoke, which will seriously endanger people's lives and corrode instruments and instrumentation facilities.

In some densely populated places in developed countries and developed cities, the use of low-smoke, halogen-free flame-retardant materials has been expressly stipulated, but ordinary PVC flame-retardant materials still used in some underdeveloped countries and regions can only meet the flame-retardant requirements. At the same time achieve low smoke and low halogen, but PVC insulated and sheathed cables used in special places such as densely populated places need to achieve low smoke and low halogen while being flame retardant

In the cold areas near the North and South Poles, there is a problem with the use of PVC cables: PVC plastics have poor cold resistance, and are prone to embrittlement and cracking at temperatures below -30°C.

The cold resistance of polyvinyl chloride is much lower than that of polyethylene (including cross-linked polyethylene), silicone rubber and fluoroplastics, so it is easy to cause operation accidents when using polyvinyl chloride sheathed cables under low temperature conditions, and it is also Such cables cannot be laid and installed, which will bring great difficulties to special engineering projects constructed in winter

Although cables with low-smoke, low-halogen flame retardancy or cold resistance alone are very common at present, cables with low-smoke, low-halogen flame retardancy and cold resistance have not yet been prepared.

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