Peroxide pre-crosslinked low smoke zero halogen flame retarding irradiation crosslinking polyolefin composite and preparation method thereof

Abstract

The invention discloses a peroxide pre-crosslinked low smoke zero halogen flame retarding irradiation crosslinking polyolefin composite and a preparation method thereof. The preparation method comprises steps of adding 0.5-5 parts of antiflaming synergist into 50-70 parts of polyolefin, mixing uniformly, then adding 30-50 parts of fire retardant, 0.5-5 parts of polyfunctional group cross-linking agent and 0.1-1 part of antioxygen, mixing uniformly, then extruding and pelletizing so as to obtain an irradiation crosslinking material, then uniformly mixing 100 parts of irradiation crosslinking material and 1-5 parts of peroxide master batch, extruding and wrapping on the electric lead core of an electric wire, finally, irradiating 60-180KGy dosage with high-power electron beam or cobalt source for crosslinking, wherein the components above are weighed in parts by weight. The low smoke zero halogen flame retarding irradiation crosslinking polyolefin composite prepared through peroxide pre-crosslinking has fast crosslinking speed, high productivity, low energy consumption, and good flame resistance, and also has excellent smoke suppression performance and better mechanical property.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant polyolefin materials, and in particular relates to a low-smoke, halogen-free flame-retardant radiation cross-linked polyolefin composite material and a preparation method thereof. Background technique [0002] Cross-linked polyolefin materials have excellent mechanical and physical properties, electrical properties, high service temperature, corrosion resistance, and good heat resistance. They are being increasingly used in the preparation of electricity, energy, petrochemicals, electronics, communications, Wire and cable for information, locomotive and other industries. However, cross-linked polyolefins are easy to burn during use, and the resulting fires bring huge threats and losses to people's lives and properties. [0003] Because the halogen-containing flame retardant and antimony trioxide flame retardant system will release a large amount of poisonous and corrosive gases when burni...

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Problems solved by technology

However, how to add DCP to polyolefin materials without cross-linking in the extrusion molding process of polyolefin materials (different from the thermocompression molding in the literature), and it cannot affect the processing, molding and irradiation of polyolefin materials As well as the irreversible impact in the post-treatment process, if these requirements can be achieved, this will increase the cross-linking efficiency of polyolefin materials, but so far there has been no use of peroxide as a pre-cross-linking agent to improve the low-smoke halogen-free flame retardant radiation. According to cross-linked polyolefin composites

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