Preparation process of a strippable semiconductive outer shielding material

Abstract

The invention provides a formula of a strippable semiconductive outer shielding material and a preparation process thereof. The formula consists of the following components in parts by weight: 100 parts of base material, 50-55 parts of conductive carbon black, 2-4 parts of stripping agent, 3-5 parts of antioxidant, 3-5 parts of crosslinking agent, 1-3 parts of reinforcing agent, 0.5-1 part of anti-aging agent and 10-12 parts of plasticizer. The preparation process comprises the following steps: plastifying the base material in the formula; sequentially adding the base material, the conductive carbon black, the plasticizer, the reinforcing agent, the anti-aging agent, the stripping agent and the antioxidant, and performing melting mixing; and after the mixing, extruding and granulating and performing high-speed mixing and high-temperature crosslinking. According to the semiconductive outer shielding material provided by the invention, through the coordination effect of the components and the optimal content proportions as well as a proper preparation process, excellent mechanical property, stripping property, flame retardance, conductivity and temperature stability are obtained.

Description

Technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation process of a peelable semi-conductive outer shielding material for cables. Background technique [0002] The wire and cable industry is an important supporting industry for the two pillar industries of the national economy, electric power and communications, and has an extremely important position in the national economy. The total output of the industry accounts for 4‰ to 5‰ of the total GDP of the country. Wire and cable products play a role in transportation. The important role of energy and information transmission is the "blood vessel" and "nerve" of the national economy. [0003] Insulated cables are usually composed of conductor cores covered with insulating layers. As we all know, in higher high-voltage direct current electric fields, the presence of fine unevenness in insulated cables can easily cause the insulation between the insulating layer and the...

AI Technical Summary

Problems solved by technology

[0004] The existing semi-conductive outer shielding materials are mainly prepared by adding conductive carbon black with certain conductivity to the base material of polymer composite materials, and then adding other auxiliary materials. However, the selection of base materials and auxiliary materials, especially for each composition There is no unanimous opinion on the formula, but it is precisely these components and their content that have an extremely important impact on the subsequent product preparation process and the final product performance

For example, the base material adopts ethylene-propylene rubber, polyvinyl chloride and other materials with high molecular weight, which have poor capacity for fillers, and the addition of conductive carbon black is large, which leads to poor fluidity of the material and subsequent extrusion processing. However, the commonly used ethylene-vinyl acetate copolymer as a base material has defects such as poor peelability from the insulating layer, VA is thermally decomposed during extrusion processing, and particles are produced on the surface, which affects product performance.

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