Preparation method for silane coupling agent modified CNTs/CFDSF/AG-80 epoxy resin composite material

Abstract

The invention relates to a preparation method for a silane coupling agent modified CNTs / CFDSF / AG-80 epoxy resin composite material. The preparation method mainly comprises the following steps: step 1,acidification of carbon nanotubes (CNTs) with a mixed acid solution of concentrated nitric acid and concentrated sulfuric acid; step 2, modification of O-CNTs obtained by acidification treatment through a silane coupling agent; step 3, surface cleaning and surface modification treatment of carbon fiber double-layer spaced fabric (CFDSF); and step 4, pouring and thermocuring of CFDSF with a prepared modified CNTs / AG-80 epoxy resin solution. According to the invention, the silane coupling agent modified CNTs / CFDSF / AG-80 epoxy resin composite material prepared through the above-mentioned preparation steps and concrete process parameters thereof and with advantages of good conductivity, thermodynamic properties and less usage amount of a conducting material has the following advantages: modified carbon nanotubes are uniformly distributed in a matrix; and the composite material has good conductive stability and can be extensively applied to the fields of electronics, electrostatic protection, electromagnetic shielding, microwave absorption, etc.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a silane coupling agent modified CNTs / CFDSF (carbon fiber double-layer spacer fabric) / AG-80 epoxy resin composite material and a preparation method thereof. Background technique [0002] With the rapid development of the electronic technology industry, the demand for functional composite materials with good electrical conductivity is also increasing. Since the conductive composite material has the characteristics of light weight, no rust, good dimensional stability, and adjustable conductivity in a wide range, it is also easy to process into various complex shapes and easy to mass industrial production, so it is used in electrostatic protection. , electromagnetic shielding, microwave absorption and other fields are widely used. At present, the common conductive composite materials usually use polymer as the matrix, and at the same time add conductive substances such as carbon-...

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Problems solved by technology

[0012] Chinese patent application (201010221872.2) discloses a preparation method of multi-walled carbon nanotubes (MWNTs) hybrid CF / EP laminate composite material, the preparation method of the composite material includes ultrasonic treatment of MWNTs dispersant to obtain uniformly dispersed MWNTs Dispersion liquid, and then spray the MWNTs dispersion liquid evenly on the carbon fiber fabric with a sprayer, and then heat-press it with epoxy resin after drying. This application enters MWNTs in the CF / EP composite material to improve the surface properties of the carbon fiber fabric Improves the mechanical properties of the composite, but the electrical conductivity of the material is insufficient

Although the addition of CNTs can effectively improve the electrical conductivity of the composite material system, as the content of CNTs increases to a certain range, its mechanical properties will show a downward trend instead, and the overall mechanical properties are not excellent, so it is necessary to conduct conductive fillers. Modification treatment may need to explore the synergistic effect of multi-component conductive fillers on composite materials, which has solved the above-mentioned bottleneck problem in the current development of composite conductive materials

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