Sandwich structure composite material and preparation method thereof

Abstract

The invention discloses an interlayer structure composite material and a preparation method thereof. The composite material comprises a hollow glass microbead sandwiched layer and carbon fiber covering layers disposed on two opposite surfaces of the hollow glass microbead sandwiched layer; and the hollow glass microbead sandwiched layer is formed by hot pressing and curing glass fiber preimpregnated cloth made by virtue of a hot melt method and capable of being laid in a flat or curved mold, and the carbon fiber covering layer is formed by hot pressing and curing carbon fiber preimpregnated cloth made by virtue of a hot melt method and a preimpregnating process and capable of being laid in a flat or curved mold. The method comprises the following steps: first preparing carbon fiber preimpregnated cloth, then preparing glass fiber preimpregnated cloth, and covering two surfaces of the glass fiber preimpregnated cloth with the carbon fiber preimpregnated cloth, and hot pressing and molding. The method is simple in process, convenient to operate and low in cost; and the prepared interlayer composite material is low in density, light in weight, high in pressure resistance, excellent in bending performance and good in appearance quality.

Description

technical field [0001] The invention relates to the technical field of sandwich structure composite materials, in particular to a sandwich structure composite material containing a hollow glass bead core and a carbon fiber skin and a preparation method thereof. Background technique [0002] A structural member made of two rigid, strong skins separated by a lightweight core, increasing the moment of inertia of the structure to obtain an efficient structure resistant to bending and buckling loads, called a sandwich structure. The skin is generally a continuous fiber reinforced composite material, which mainly bears the in-plane tensile stress, compressive stress and shear stress caused by the bending moment, and the core body is honeycomb, polymer foam, balsa wood, etc. Stress and support the skin without losing its stability. After optimizing the structural design, the sandwich structure can reduce the structural weight, increase the structural rigidity, and improve the stru...

AI Technical Summary

Problems solved by technology

However, as an alternative material, it also has its disadvantages. The skin and foam core material need to be molded separately, and then they are bonded or co-cured into a whole

If you need an intermediate core material with a thin wall thickness such as 0.3mm thickness and a certain curved surface shape, you need to use complex mechanical equipment to cut the foam sheet into a sheet of about 0.3mm, and then heat it above the softening point and pre-bend it so that the foam core material and the shape of the mold The disadvantage is that the production efficiency is low and the quality is not easy to guarantee. In addition, the high price of foams that can withstand high temperatures, such as PMI and PPSU, is also a major factor that limits the application of high-performance foam core sandwich structure composite materials. factor

3. As a core material, balsa wood also has disadvantages. It cannot form thin-walled and thick structures, nor can it form complex curved surface structural parts.