A kind of preparation method of carbon nanotube non-woven fabric

Abstract

The invention belongs to a preparation method of a carbon nano tube reinforcement material and relates to a carbon nano tube non-woven fabric without a surfactant and solvent residue and the preparation method of the carbon nano tube non-woven fabric. The preparation method comprises the steps: mixing a carbon nano tube and the surfactant in solvent according to a certain ratio to prepare a carbon nano tube dispersing agent; preparing the carbon nano tube non-woven fabric by adopting a vacuum or pressure-assisted solution deposition method; carrying out high-temperature anoxic treatment on the obtained carbon nano tube non-woven fabric; and removing the surfactant and the solvent left in a preparation process to obtain the carbon nano tube non-woven fabric without the surfactant and the solvent residue. According to the preparation method disclosed by the invention, the residual surfactant and solvent molecules in the preparation process of the carbon nano tube non-woven fabric are completely removed when the structure of the carbon nano tube is not damaged and the structural integrity of the carbon nano tube non-woven fabric is kept through high-temperature anoxic treatment, so that the infiltrating effect of a resin matrix on the carbon nano tube non-woven fabric and the interface binding ability of the carbon nano tube and the resin matrix are improved.

Description

technical field [0001] The invention belongs to a method for preparing a carbon nanotube reinforcement material, and relates to a carbon nanotube non-woven fabric without surfactant and solvent residue and a preparation method thereof. Background technique [0002] Since the discovery of carbon nanotubes, it has become a research hotspot in the field of materials because of its excellent mechanical properties, electrical properties, thermal properties and biocompatibility as a new type of nanomaterial. Especially the mechanical properties of carbon nanotubes, the theoretical Young's modulus is as high as 1TPa, and the tensile strength is as high as 200GPa. Such excellent mechanical properties make carbon nanotubes the most ideal nano-reinforcement for the preparation of new composite materials, especially polymer-based composite materials. [0003] Good dispersion of carbon nanotubes in the matrix, strong interfacial bonding ability and high content have become the primary ...

AI Technical Summary

Problems solved by technology

[0004] However, a large amount of surfactant will remain on the surface of the carbon nanotube non-woven fabric prepared by the solution deposition method, and solvent cleaning is usually used to remove the residual surfactant. However, due to the high specific surface area of ​​the carbon nanotube and the carbon nanotube Due to the high porosity of non-woven fabrics, it is easy to cause the adsorption of surfactants, and simple solvent cleaning cannot completely remove the residual surfactants.

Moreover, the residual surfactant small molecules will affect the wetting effect of the resin matrix on the carbon nanotube non-woven fabric, and ultimately affect the mechanical properties and heat resistance of the composite material.

In addition, the use of solvents to clean the non-woven fabric will also cause the cracking or curling of the carbon nanotube non-woven fabric, reduce its structural integrity, and also affect the mechanical properties of the composite material.