Calcium copper titanate-doped nonlinear silicone rubber composite material and preparation method thereof

Abstract

The invention discloses a calcium copper titanate-doped nonlinear silicone rubber composite material. The nonlinear silicone rubber composite material comprises a silicone rubber matrix material and a CaCu3Ti4O12 powder doped in the silicone rubber matrix material. The invention also discloses a preparation method of the calcium copper titanate-doped nonlinear silicone rubber composite material. The preparation method comprises the following steps: adding the CaCu3Ti4O12 powder to the silicone rubber raw material, fully mixing the CaCu3Ti4O12 powder and the silicone rubber raw material, placing the obtained mixture in a hot pressing die, and carrying out hot press molding to obtain the silicone rubber composite material with double nonlinear electrical properties. The nonlinear silicone rubber composite material is suitable for insulating parts working in extremely non-uniform electric field environment, has good self-adaptability to the electric field environment, and can effectively equalize the electric field, inhibit partial discharge and alleviate the aging of an insulating medium; and the material can keep good insulating characteristics in the low electric field strength region.

Description

technical field [0001] The invention relates to the technical field of electrical materials, in particular to a nonlinear silicone rubber composite material doped with copper calcium titanate (CCTO) and a preparation method thereof. Background technique [0002] In high-voltage power transmission and transformation systems, insulation is the most critical issue that determines the long-term safe and reliable operation of the system. As the system voltage level increases, the importance and difficulty of insulation problems become more prominent. Especially the insulation equipment or components that work in the environment of uneven electric field in high-voltage transmission and transformation systems, such as transmission cable terminals, insulation parts at connections, transformer insulation bushings in UHV DC converter stations, and high-voltage end parts of various insulators, etc. etc., the electric field strength it bears is far higher than the average value of the o...

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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the deficiencies of the prior art, and provide a nonlinear silicone rubber composite material doped with copper calcium titanate and its preparation method, so as to solve the uneven electric field distribution of insulation equipment or components in high-voltage power transmission and transformation systems to suppress the effect of local high electric field strength, alleviate the problem of accelerated insulation aging of insulating media in high electric field distortion environments, and achieve effective control of the uniformity of electric field distribution