Low-smoke halogen-free flame-retardant sheath material having good cold resistance and used for cable and preparation method of sheath material

Abstract

The invention discloses a low-smoke halogen-free flame-retardant sheath material having good cold resistance and used for a cable, wherein the sheath material comprises the components in parts by weight: 80-90 parts by weight of polyolefin resin, 10-20 parts by weight of a compatilizer, 160 to 180 parts by weight of a flame retardant, 1 to 2 parts by weight of a coupling agent, 0.5 to 1 part by weight of an antioxidant, and 4 to 6 parts by weight of a lubricant. The polyolefin resin is a mixture of an ethylene-vinyl acetate copolymer, an ethylene-octene copolymer and metallocene modified linear low-density polyethylene, and the weight ratio of the ethylene-vinyl acetate copolymer to the ethylene-octene copolymer to the metallocene modified linear low-density polyethylene is (30-50):(10-30):(20-40); the coupling agent is a vinyl triethoxy silane coupling agent; the lubricant is silicone master batch, and the number-average molecular weight of siloxane in the silicone master batch is 650000-800000. The sheath material is good in cold resistance (the low-temperature embrittlement temperature reaches -52 DEG C) which far exceeds the requirements in related standards.

Description

technical field [0001] The invention belongs to the field of cable preparation, and in particular relates to a low-smoke, halogen-free, flame-retardant sheathing material for cables with good cold resistance and a preparation method thereof. Background technique [0002] Power cables are widely used in my country's industrial production and residential life, and mainly play the role of power transmission. Since the outer sheath material as a protective conductor is directly in contact with the external environment, such as: sunlight, rain, temperature difference, smoke and other environmental conditions, how to ensure the service life of the material has always been an extensive research topic. Due to the embrittlement of polymer materials under low temperature conditions, the mechanical properties will decrease, accompanied by cracking, which will reduce the service life of power cables and even cause various economic and safety losses. Therefore, in order to ensure that t...

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Problems solved by technology

[0005] In order to overcome the above-mentioned defects of the prior art, one of the purposes of the present invention is to provide a low-smoke and halogen-free cable with good cold resistance for the problems of embrittlement, cracking and reduced service life of

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