Preparation method of double sizing agent modified carbon fiber reinforced epoxy resin based composite

Abstract

The invention relates to a preparation method of a double sizing agent modified carbon fiber reinforced epoxy resin based composite. According to the preparation method, through multi-layer modification of an OA-POSS mixed SiO2 sizing agent and a CNT sizing agent, introduction of complicated chemical bonds is avoided, grafting modification is performed on carbon fiber surfaces, and the modified carbon fiber reinforced epoxy resin based composite is obtained through curing at the normal temperature by use of a vacuum assisted forming process. The shearing performance of the composite is improved by 24%, the tensile property of the composite is improved by 29%, which are both higher than the mechanical properties in a thermosetting molding process.

Description

technical field [0001] The invention belongs to the technical field of surface modification of composite materials, and relates to a preparation method of a hybrid modified carbon fiber reinforced epoxy resin-based composite material, more specifically, relates to a double sizing agent modified carbon fiber reinforced epoxy resin-based composite material. Exploration of preparation methods, preparation of carbon fiber reinforced epoxy resin matrix composites, and detection of mechanical properties. Background technique [0002] Carbon fiber reinforced epoxy resin-based composites are widely used in aerospace, construction, automobile industry and other fields due to their light weight and high strength, and are the focus of the development and application of high-strength industrial products. Therefore, how to ensure the high strength of carbon fibers and solve the problems of tensile and impact damage delamination of carbon fibers are currently facing difficulties. In the ...

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Problems solved by technology

In the current research, there are many methods for surface modification. Scholars have used CNT to modify the epoxy resin matrix, which has improved the toughness of the matrix to a certain extent; and mixed organic-inorganic modification In terms of preparation, organic materials and inorganic materials have been mixed and modified before being applied to composite materials. This method leads to the increase of defects caused by the mixed modification, which leads to little improvement in the performance of composite materials.

For the composite material of multi-component modified carbon fiber, CN102912626A and CN104277421A have done similar research, but because they are all the application of thermosetting molding process, and there is no method of infiltration of sizing agent in the modification process, directly through acid oxidation, etc. The chemical treatment process is modified, and the modification is not complete, which has a certain impact on the physical and chemical properties of the graft, and carbon fiber and semisiloxane belong to different chemical systems, which are closely related to the chemical interaction of functional groups between substances. Good interfacial bonding cannot be achieved. Although various complex chemical bonding effects such as chemical bonds and Van der Waals force effectively improve the tensile strength and strain properties of the composite material, they have a negative impact on the flexural toughness and impact resistance of the composite material.

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