Silane halogen-free flame retardant cross-linking polyolefine cable and manufacturing method thereof

Abstract

The invention relates to a silane halogen-free flame retardant cross-linking polyolefine cable. The cable is successively composed of a conductor, an insulating layer, a packing layer, a flame retardant oxygen barrier layer and an outer protective layer, and is characterized in that the insulating layer adopts a low-fume halogen-free flame retardant silane cross-linking polyolefine material, a halogen-free high flame retardant bag belt is wrapped outside a cable core so as to form the oxygen barrier layer, and the outer protective layer adopts a thermoplastic low-fume halogen-free flame retardant silane cross-linking polyolefine material; low-fume halogen-free flame retardant silane cross-linking polyolefine is prepared by a two-step method, namely adding a grafted silane copolymer into a catalysis master batch at the mass ratio of 95:5 and then extruding out by virtue of a common extruding machine with the phi of 90/25; and cross linkage is realized through any of the following methods: a, immerging in hot water at 90-90DEG C, and performing cross linkage for 2-4 hours; and b, exposing to low pressure steam humidity at 0.15bar, and performing cross linkage for 3-5 hours. The cable provided by the invention has the advantages of greatly improving the insulating property, and meeting the requirements of an environmentally-friendly cable.

Description

technical field [0001] The invention relates to a silane halogen-free flame-retardant cross-linked polyolefin cable and a method thereof, belonging to the field of cables. Background technique [0002] At present, wire and cable insulation materials are developing from polyvinyl chloride to polyolefins. This is because polyolefin insulation materials have excellent electrical insulation properties, mechanical and physical properties, and polyolefin insulation also tends to develop towards cross-linking. At present, there are three main methods of cable cross-linking technology, namely peroxide chemical cross-linking (DCP cross-linking) method, silane cross-linking method and radiation cross-linking method. It becomes a three-dimensional network structure, so as to achieve the purpose of material modification. The peroxide DCP cross-linking production line adopts catenary or vertical tower equipment. The investment in equipment and workshop is high and the cost is high. The ...

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Problems solved by technology

Although low-smoke halogen-free flame-retardant polyolefin cables can overcome the shortcomings of dense smoke and release of toxic and corrosive gases when halogen-containing flame-retardant cables burn in a fire, such cables have problems such as unsatisfactory electrical and mechanical properties, such as It is very easy to absorb moisture in the air, resulting in a decrease in the volume resistivity of the material, and if it has high flame retardant properties, it is necessary to add a sufficient amount of flame retardant fillers, high fillers will lead to a decrease in the strength and elongation of the polymer, thus affecting the material. The mechanical and electrical properties have a great influence

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