High-voltage direct current cable material and preparation method thereof

Abstract

The invention discloses a high-voltage direct current cable material, which is characterized by comprising the following raw materials (by weight): 80-90 parts of EPDM rubber, 5-10 parts of silicone rubber, 5-15 parts of naphthenic oil, 2-8 parts of polydimethylsiloxane, 15-25 parts of a reinforcing filler, 25-35 parts of aluminium hydroxide, 0.5-2 parts of a coupling agent, 1-2 parts of a vulcanization additive, 2-7 parts of an anti-rat agent nonivamide, 2-4 parts of titanium dioxide and 1-3 parts of bifenthrin. The high-voltage direct current cable material of the invention has high mechanical strength, controllable conductivity, excellent resistance to UV aging, heat resistance and corrosion resistance, and also has anti-rate and anti-termite functions. The high-voltage direct current cable material has advantages of low cost, easily-available raw materials and simple preparation method, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of cable materials, in particular to a high-voltage direct current cable material and a preparation method thereof. Background technique [0002] With the development of the power industry, the requirements for the safety and reliability of the power grid are getting higher and higher. In recent years, more and more electrical manufacturers have begun to use composite materials instead of traditional electric porcelain to process and manufacture insulation products. Composite insulation materials After more than ten years of development, a complete set of product development technology and manufacturing process from mold processing to injection molding has been established, and it is relatively mature. However, the research on the composite material itself is limited to the research on a single type of base polymer, and only uses the fundamental characteristics of the base polymer itself, so there are still ...

AI Technical Summary

Problems solved by technology

[0003] For EPDM, which was widely used in the early stage, its advantage is that its molecular weight is extremely large, so its mechanical strength is extremely high, its Shore hardness is large, it is tear-resistant; it is resistant to electrical corrosion and has strong tracking ability; but its disadvantage is its poor hydrophobicity. The surface of the material is prone to flakes of accumulated water and dirt, resulting in a decrease in surface resistivity and reduced insulation performance; at the same time, its aging resistance is relatively poor, and it is easily affected by ultraviolet rays to accelerate aging

[0004] However, PDMSO, which is widely used at present, has inherently strong hydrophobicity and surface mobility, that is, it is not easy to form large-area water stains on its surface, and avoids the situation where large-area water stains form conductive paths and reduce dielectric strength. ; The mobility of its molecule itself makes even if the surface adheres to dirt, due to the migration of molecules, it will re-form protection on the dirty surface and restore surface hydrophobicity; at the same time, because the main bond of polydimethylsiloxane is Si-O, The ultraviolet energy on the surface can hardly destroy its main molecular chain, so its anti-ultraviolet aging ability is strong. The electric field distribution in the DC high-voltage cable accessories is mainly affected by the electrical conductivity, and the electrical conductivity is affected by both the DC field strength and the temperature. Therefore, the electric field The distribution is more complicated. Improper conductivity can easily concentrate the electric field at the cable insulation layer and the stress cone, causing the cable and the stress cone to be broken down during operation. Therefore, the control of conductivity in DC cable accessories is particularly important. Conductivity control in a reasonable range is crucial to the operation of DC cable accessories, especially during product development and design, it is necessary to use conductivity data for simulation analysis and calculation