Insulating composite board for high-voltage load box and preparation method of insulating composite board

Abstract

The invention discloses an insulating composite board for a high-voltage load box and a preparation method of the insulating composite board, and belongs to the technical field of preparation of composite materials. The preparation method comprises the following steps: S1, mixing a heat-vulcanized silicone rubber compound and an inorganic filler in an open mill to obtain a composite silicone rubber semi-finished product; s2, vulcanizing and molding the composite silicone rubber semi-finished product to obtain a composite silicone rubber sheet; and S3, bonding the composite silicone rubber sheet and the epoxy resin plate together, and vulcanizing at room temperature to obtain the insulating composite plate for the high-voltage load box. The high-temperature-resistant, waterproof, heat-insulating and insulating composite plate can be used for a wiring end plate of a high-voltage load box, the method is simple, operation is easy and convenient, and the prepared composite plate meets the high-temperature-resistant, waterproof, heat-insulating and insulating performance requirements of serving as the wiring end plate of the high-voltage load box on the basis that the supporting strength is guaranteed.

Description

technical field [0001] The invention relates to an insulating composite plate for a high-voltage load box and a preparation method thereof, belonging to the technical field of preparation of inorganic / polymer composite materials. Background technique [0002] In the case of distributed power stations such as wind farms and photovoltaic power stations and high-voltage flexible and direct power grids with multi-energy sources, the surplus of load and storage power of the new energy power generation network needs to be absorbed by the load. Because of its extremely high power, it can reach tens of megawatts. The temperature in the resistance box can reach up to nearly 300 ℃. As the terminal plate material of the load box, on the basis of ensuring the support strength, it must also meet the performance requirements of high temperature resistance, insulation, waterproof and weather resistance. [0003] At present, the common terminal board of 2MW high-power resistance box is a do...

AI Technical Summary

Problems solved by technology

[0003] At present, the common 2MW high-power resistance box terminal board is a double-layer composite board with mica board and epoxy resin board sealed with insulating glue. The structure of the terminal board is as follows: figure 1 As shown, the circumference of the mica board 4 and the epoxy resin board 2 are edge-sealed with a sealant 7, the terminal post 6 runs through the composite board, and is fixed with fasteners 5 on both sides of the composite board, and the two ends of the terminal post 6 are used for The epoxy resin plate 2 and mica both have good insulation. The epoxy resin plate has high strength but poor heat resistance, so it provides strength performance for the terminal plate on the side away from the load. Mica is an inorganic mineral and its resistance Good high temperature resistance, but low strength, so it acts as a thermal insulation layer between the load and the epoxy resin board

Moreover, the price of mica is relatively high and it is easy to absorb moisture. This kind of composite board edge sealing glue usually uses ordinary insulating glue, which has poor high temperature resistance. The edge sealing between the mica board and the epoxy resin board is prone to rainwater, resulting in a decrease in the insulation between the boards, short-circuit breakdown of the terminal board, making the loading box unable to work and even causing safety accidents

At the same time, because the mica board itself has a lamellar structure, it is easy to absorb water between the layers, which will reduce the insulation of the mica board and cause short circuit breakdown.

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