Lightning protection composite material surface film as well as preparation method and application thereof

Abstract

The invention discloses a lightning protection composite material surface film as well as a preparation method and an application thereof and relates to a lightning protection composite material surface film for aerospace as well as a preparation method and an application thereof. The invention aims to solve problems in the previous aerospace composite material manufacture lightning protection method that the electromagnetic shielding property is poor, the process is complicated or weight gain is large and the like. Carbon nanomaterials and micron silver flakes are taken as conductive materials, a novel epoxy resin modified method is provided, and the heat resistance and toughness of the epoxy resin are improved. The lightning protection composite material surface film disclosed by the invention is composed of epoxy resins, micron silver flakes, carbon nanomaterials, a toughening modifier, a heat-resistant modifier, a curing agent, a UV stabilizer and a carrier. The preparation methodof the lightning protection surface film comprises the following steps: uniformly blending the raw materials, and forming the film by adopting a resin hot melting method. The lightning protection composite material surface film disclosed by the invention is capable of improving the surface quality of composite material structural members, and has the lightning protection function.

Description

technical field [0001] The invention relates to an aerospace lightning protection composite material surface film and a preparation method and application thereof. Background technique [0002] Due to the demand for weight reduction, a large number of composite materials are used in the aerospace field to replace metals as the main material of aircraft. Composite materials have excellent specific strength and other advantages. Because composite materials have poorer electrical conductivity than metals, it is difficult to conduct high-energy currents after lightning strikes. , will inevitably lead to the accumulation of large energy, resulting in damage to composite materials or damage to internal instruments. At present, the lightning protection of composite materials mainly adopts the form of shunt strips, the method of laying metal mesh, or the method of flame spraying aluminum. The above forms have problems such as poor electromagnetic shielding performance, complicated p...

AI Technical Summary

Problems solved by technology

[0002] Due to the demand for weight reduction, a large number of composite materials are used in the aerospace field to replace metals as the main material of aircraft. Composite materials have excellent specific strength and other advantages. Because composite materials have poorer electrical conductivity than metals, it is difficult to conduct high-energy currents after lightning strikes. , will inevitably lead to the accumulation of large energy, resulting in the destruction of composite materials or the damage and failure of internal instruments

At present, the lightning protection of composite materials mainly adopts the form of shunt strips, the method of laying metal mesh, or the method of flame spraying aluminum. The above forms have problems such as poor electromagnetic shielding performance, complicated process or increased weight.

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