A formulation of a material for cable insulation with excellent performance

Abstract

The invention provides a formula of a cable insulation material excellent in performance. The cable insulation material is characterized by consisting of the following materials in parts by weight: 100 parts of a base stock, 20-30 parts of an inorganic filler I, 5-10 parts of an 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 cross-linking auxiliaries and 0-2 parts of a stripping agent. Through coordination of various components as well as the most appropriate content proportion, the external semi-conductive shielding material produces the novel flame-retardant and water-resistant cable insulation material which is excellent and stable in thermal and mechanical performance.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to provide a formulation 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 the conte...

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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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