High-flame-retardant cable sheath

Abstract

The invention provides a high-flame-retardant cable sheath. A preparation method of the high-flame-retardant cable sheath comprises the following steps: (1), activating a mixture of graphite and graphene; (2), mixing all raw materials in parts by weight as follows: 40 to 48 parts of polyvinyl chloride, 20 to 24 parts of butadiene styrene rubber, 7 to 10 parts of the mixture of the activated graphite and graphene, 10 to 13 parts of an inorganic flame retardant, 5 to 10 parts of a packing material, and 1 to 3 parts of a plasticizer; (3), putting the materials into an internal mixer, refining, and then performing blending extrusion through a double-screw extruder, so as to obtain the high-flame-retardant cable sheath. The method adopts the graphite and graphene which are activated as advanceas heat conduction materials and are matched with proper flame retardant materials and soft flexible materials, an obtained cable is good in flame retardance, high in thermal conduction capacity and elongation at break, light in weight, small in size, and wide in application range.

Description

technical field [0001] This law relates to the technical field of cable sheaths, in particular to a high flame-retardant cable sheath. Background technique [0002] The cable sheath is the outermost layer of the cable. Common cable sheath materials include polyethylene, polyvinyl chloride, and neoprene. As the outermost material of the cable, the cable sheath has a great influence on the comprehensive performance of the cable. It not only requires excellent physical properties, such as tensile strength, elongation at break, etc., but also requires good heat resistance and Anti-aging properties, etc. At present, most of the research on the heat resistance and flame retardancy of cables is concentrated on the direction of adding flame retardant materials and thermal conductive materials. [0003] CN104893080A provides a kind of halogen-free flame retardant sheathing material for nuclear power 1E class K3 cables, which uses inorganic flame retardants, nitrogen and phosphorus ...

AI Technical Summary

Problems solved by technology

[0003] CN104893080A provides a kind of halogen-free flame retardant sheathing material for nuclear power 1E class K3 cables, which uses inorganic flame retardants, nitrogen and phosphorus flame retardants and synergistic flame retardants in combination, thereby achieving multiple flame retardant effects; but The use of various flame retardants will not only increase the weight of the cable, but also increase the cost; and its application to graphene is to use graphene aqueous solution directly, without considering whether graphene can be dispersed evenly in the sheath material, and the utilization rate Is it higher

[0004] CN105017676A provides a kind of graphene-containing cable with high thermal conductivity polyvinyl chloride sheath material and cable, which uses a large amount of filler active calcium, heavy calcium carbonate, calcined clay and other heavy raw materials, which will greatly increase the weight of the cable Improvement, and the use of graphene is directly added to the raw material, without considering the agglomeration of graphene, and does not solve the problem of whether graphene can be evenly distributed in the cable material

[0005] In the above-mentioned technologies, the use of flame-retardant materials is large, which not only increases the weight and diameter of the cable, reduces the flexibility of the cable, and reduces the elongation at break, but also hinders the thermal conductivity of the heat-conducting material, and the heat generated by the cable conductor cannot be transmitted out in time. , the long-term accumulated heat will make the layers of the cable aging and brittle. Although the outer sheath maintains the flame-retardant effect, the internal structure of the cable has actually deteriorated, resulting in increased resistance, large electromagnetic radiation, and waste of electric energy.