Nano-clay-containing irradiation crosslinked polyolefin cable material and preparation method thereof

Abstract

The invention relates to a nano-clay-containing irradiation crosslinked polyolefin cable material, which comprises the following raw materials in parts by weight: 55-75 parts of an ethylene-vinyl acetate copolymer, 25-45 parts of metallocene linear low-density polyethylene, 5-10 parts of a grafting material, 2-8 parts of a lubricant, 0.5-2 parts of an antioxidant, 120-160 parts of inorganic filler, 8-15 parts of a charing promoter, 5-15 parts of nano-clay, 0.5-3 parts of a crosslinking sensitizer, and 3 parts of carbon black masterbatch. According to the invention, in the polyolefin cable material, by adding the nano-clay as a flame retardant synergist of the inorganic filler and being fitted with the charing promoter, the nano-clay can increase the viscosity of a melt in the process of polymer burning, so that the barrier property of the melt can be enhanced, the escape of small molecules can be stopped, the heat release rate and the smoke density are greatly reduced, the fireproof performance is improved, and then cables can be subjected to A-class bundled burning, therefore, the cable material can be applied to the spaces with high requirements on oil-resistant and flame retardant properties.

Description

technical field [0001] The invention relates to a wire and cable material, in particular to a radiation crosslinked polyolefin cable material containing nano-clay and a preparation method thereof. Background technique [0002] Domestic low-smoke and halogen-free cable material technologies are uneven. Most cable material manufacturers have insufficient research and development capabilities. They mainly focus on the low-end market and increase profits by reducing costs. These cable materials can meet the requirements in general occasions, but some special occasions, such as rail transit, oil platforms, etc., put forward higher requirements for the oil resistance and flame retardancy of cables, which cannot be satisfied by the performance of ordinary cable materials. . Most domestic patents disclose cable materials with better oil resistance, but they do not make higher requirements for flame retardancy. For example, Deltex’s patent "a thermoplastic oil-resistant, halogen-fre...

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing cable material has a low combustion level, and provides a kind of irradiation crosslinked polyolefin cable material containing nano-clay. Oil resistance, can be used in occasions that require high oil resistance and flame retardancy

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