A kind of high temperature resistant insulation aramid fiber honeycomb composite material and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant insulating aramid honeycomb composite material, which is a sandwich structure, comprising an aramid honeycomb core layer, an upper skin and a lower skin located on both surfaces of the aramid honeycomb core layer; the upper skin and the lower skin They are formed by sequentially superimposing epoxy glass fiber prepreg, electrical aramid fiber cardboard and epoxy glass fiber prepreg by hot pressing. The preparation method of the present invention (1) will be used to prepare the epoxy glass fiber prepreg on the outside of the skin, the polyaramid fiber paperboard for electrical use, the aramid fiber honeycomb core, and the epoxy glass fiber prepreg used to prepare the inside of the skin The material is cut according to the required size; (2) Lay the material according to the thickness of the product to be pressed between two steel plates coated with a release agent or placed with a release film; (3) Put the steel plate into the hot Hot press forming in the press, cooling and demoulding to obtain the aramid honeycomb composite material. The aramid fiber honeycomb composite material of the invention has light weight, high heat resistance and high insulation performance.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to an aramid honeycomb composite material and a preparation method thereof, especially an aramid honeycomb sandwich composite material with light weight, high mechanical properties, excellent heat resistance and insulation performance, which can be used as a lightweight It can be applied to the cabinet body of the on-board electrical cabinet of rail trains and the insulation protection cover of other electrical components. Background technique [0002] Composite materials are new materials that are optimized by combining materials with different properties by using advanced material preparation technology. The matrix materials of composite materials are divided into two categories: metal and non-metal. The matrix of non-metallic composite materials mainly includes synthetic resin, rubber, ceramics, etc., and the reinforcing materials mainly include glass fiber, carbon fiber, arami...

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Problems solved by technology

[0004] The traditional aramid honeycomb sandwich composite materials mainly have the following problems: (1) The traditional aramid honeycomb composite material has high manufacturing cost, insufficient heat resistance, and thin skin thickness is difficult to meet the requirements of insulation performance; (2) the traditional layer The breakdown voltage of laminated insulating materials usually cannot reach 15kv / mm. In high-voltage applications, the thickness of laminated products needs to be continuously increased to ensure insulation performance, but this will greatly increase the weight

[0005] The breakdown voltage of laminated insulating materials usually cannot reach more than 15kv / mm. In the field of high-voltage applications, the thickness of laminated products needs to be continuously increased to ensure insulation performance, but this will greatly increase the weight

The aramid honeycomb composite material composed of resin-based glass fiber skin and aramid honeycomb core layer is usually thinner in order to reduce weight, resulting in poor breakdown voltage; the molding process mostly uses medium temperature prepreg ( Expensive, high storage requirements, short application cycle) curing at 120°C, high manufacturing cost and low heat resistance level, it is difficult to meet the requirements of laminated insulating materials, so the resin-based glass fiber skin and aramid honeycomb core layer are composited. The aramid fiber honeycomb composite material has not yet realized the real application in insulating materials

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