Preparation method of reactive liquid nanometer additive for carbon fiber wet winding

Abstract

The invention relates to a reactive liquid nanometer additive suitable for a wet winding forming technology of carbon fiber composite materials, belonging to the field of carbon fiber composite material preparation. The reactive liquid nanometer additive comprises the following materials: material 1: a multiwalled carbon nano tube; material 2: mixed acid of concentrated sulfuric acid and concentrated nitric acid; material 3, a mixed solution of thionyl chloride and N, N-dimethylformamide; material 4, i.e. a mixed solution of the N, N-dimethylformamide and liquid aliphatic series polyamine, and a material 5, i.e. liquid ethoxyline resin, wherein the in the mixed acid of the concentrated sulfuric acid and the concentrated nitric acid, the mole ratio of a sulfate radical to a nitrate radical is 2 / 1 to 4 / 1; the volume ratio of the thionyl chloride to the N, N-dimethylformamide is 30 / 1 to 50 / 1; the volume ratio of the N, N-dimethylformamide to the aliphatic series polyamine is 0.8 / 1 to 1.2 / 1; and the viscosity of the liquid ethoxyline resin is less than 500 mPas under room temperature. The reactive liquid nanometer additive can be directly used as a thinner of the an ethoxyline resin matrix and can enhance the heat resistance and the interlayer shearing property of the carbon fiber composite materials when a very little using amount is used.

Description

Technical field: [0001] The invention belongs to the field of preparation of carbon fiber composite materials, in particular to a reactive liquid nano-additive suitable for carbon fiber composite material wet winding molding process, which can be used as a diluent for epoxy resin matrix to improve the performance of matrix and composite material . Background technique: [0002] Carbon fiber and its composite materials have a series of excellent properties such as high specific strength and specific modulus, small thermal expansion coefficient, etc., and have become one of the most ideal aerospace composite materials. Epoxy resin has good adhesion, chemical corrosion resistance and low shrinkage, and has a wide range of applications in the field of advanced composite materials. The performance of composite materials often depends on the performance of each component of the material itself and the interface bonding performance between them. As the aerospace field faces compl...

AI Technical Summary

Problems solved by technology

As far as the epoxy resin matrix is ​​concerned, high heat resistance usually requires the matrix to have a high cross-linking density, which will make the matrix brittle, and low elongation at break is not conducive to the performance of carbon fibers, which will reduce the interlaminar shear performance of composite materials

In addition, resins with high heat resistance are mostly solid or high-viscosity liquids at room temperature. Due to the strict requirements on the viscosity of resins in the wet winding process (usually 200-800mPas), these high heat-resistant resins are also limited. Application in wet winding