High-voltage electrical insulating tape and preparing method thereof

Abstract

The invention provides high-voltage electrical insulating tape. The high-voltage electrical insulating tape sequentially comprises a base film, a colloid layer attached to the base film and a pressure-sensitive layer on the colloid layer. The base film is made of polypropylene. The colloid layer is prepared from, by mass, 10 parts to 20 parts of polytetrafluoroethylene rubber, 15 parts to 30 parts of isobutene-vinyl copolymers, 10 parts to 25 parts of oxirane-epoxy propane copolymers, 10 parts to 20 parts of nanometer aluminum oxide, 15 parts to 30 parts of superfine talcum powder, 0.5 part to 1.5 parts of rosin, 1.0 part to 5.0 parts of dimethyl siloxane, 1.0 part to 1.5 parts of phenolic resin, 1.0 part to 2.0 parts of carbon black, 1.0 part to 2.0 parts of plasticizers and 1.5 parts to 3.0 parts of antioxidants. The pressure-sensitive layer is prepared from, by mass, 20 parts to 30 parts of polymethacrylate and 30 parts to 50 parts of hydrogenated isoprene-butadiene copolymers. The high-voltage electrical insulating tape has quite good weather resistance, quite good high temperature resistance and quite good insulation.

Description

technical field [0001] The invention relates to the technical field of electrical protection, in particular to a high-voltage electrical insulating tape and a preparation method thereof. Background technique [0002] In the process of electrical equipment manufacturing, construction and use, it is often necessary to insulate and seal the various terminals and connection joints of wires and cables that may leak electricity. The most commonly used treatment material is insulating tape. There are three main types of insulating tapes commonly used at present: the first is black cloth-based insulating tape, commonly known as electrical black tape, which is used to wrap wire joints with a voltage not exceeding 380 volts; the second is polyvinyl chloride insulating tape, namely PVC Adhesive tape, commonly known as plastic tape, is mainly used for indoor and outdoor wire joints and automotive wiring wrapping and insulation protection of electronic parts, the voltage does not exceed ...

AI Technical Summary

Problems solved by technology

[0004] However, no matter which self-adhesive rubber insulating sealing tape mentioned above cannot well meet the insulation sealing requirements under long-term water immersion or humid and harsh weather conditions, especially in the case of manually wrapping wire and cable joints with complex shapes

Analysis of the reasons is mainly due to the fact that the current self-adhesive rubber insulating and sealing base materials are not good enough for the metal core materials of wires and cables or for their plastic sheath substrates, resulting in long-term water immersion or long-term wet and severe weather conditions. Under normal circumstances, water or water vapor will gradually penetrate into the metal conductor from the bonding interface, thereby destroying its sealing performance and electrical insulation performance; and the reason why the bonding performance is not good enough is mainly because the current self-adhesive rubber insulating sealing adhesive tape base material The initial adhesion of the surface is poor, so that it has poor wetting ability to the surface of the metal core material or plastic skin substrate

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