Preparation process of a material for cable insulation with excellent performance

Abstract

The invention provides a preparation process of a material with excellent performance for cable insulation. The material is characterized by consisting of the following components in parts by weight: 100 parts of a base material, 20-30 parts of inorganic filler I, 5-10 parts of inorganic filler II, 0.5-1.5 parts of carbon black, 3-5 parts of a silane coupling agent, 3-5 parts of an antioxidant, 1-3 parts of a cross-linking agent, 0.2-0.5 part of a cross-linking assistant and 0-2 parts of a stripping agent. Through appropriate machining processes of the above components such as mixing, extrusion and granulation, crosslinking and the like, the novel flame-retardant and water-resisting material with excellent and stable thermal and mechanical performances for cable insulation is prepared.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to provide a preparation process of a material for cable insulation with excellent performance. 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 plays an extremely important role in the national economy. The important role of energy and information transmission is the "vessel" and "nerve" of the national economy. [0003] Wires and cables are usually composed of conductor core wires covered with insulating layers, and polyvinyl chloride has been widely used as insulating materials for wires and cables due to its advantages of simple manufacturing process, stable performance, convenient laying, and not limited by height differences. However, as people's awareness of environmental protection continues to increase, the restrictions on t...

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Problems solved by technology

[0003] Wires and cables are usually composed of conductor core wires covered with an insulating layer, and polyvinyl chloride has been widely used as an insulating material for wires and cables due to its advantages of simple manufacturing process, stable performance, convenient laying, and not limited by height differences. However, as people's awareness of environmental protection continues to increase, the restrictions on the content of halogens in materials are becoming increasingly stringent, coupled with the inherent disadvantages of high dielectric loss, low operating temperature, and insufficient withstand voltage level of PVC wires and cables, it is gradually being used by emerging industries. , cross-linked polyolefin materials with better performance

[0004] However, as a halogen-free cross-linked polyolefin material, metal hydroxides such as magnesium hydroxide and aluminum hydroxide are often added to the polyolefin in order to meet the flame retardant performance of the cable insulation layer, but on the one hand, adding metal hydroxide The flame retardant effect produced by the compound is small, and the required flame retardancy is often not obtained. On the other hand, with the increasing amount of metal hydroxide added to improve the flame retardant performance, the elongation of the cross-linked polyolefin material Mechanical properties such as tensile strength and heat resistance will be significantly reduced

[0005] Not only that, the limitation of cross-linked polyolefin is that due to the presence of impurities such as cross-linking agent decomposition residues, micropores or unevenness in the system, it often produces bush-like defects under the action of water or a strong electric field. The so-called water tree effect, which leads to a reduction in breakdown strength and eventually electrical failure

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