Preparation method of carbon nano-tube/epoxy resin composite material

Abstract

The invention discloses a method for preparing a carbon nanotube / epoxy resin composite material, which comprises the following steps: air-milling the primary carbon nanotube, carboxylation, and introducing a carbon nanotube on the surface of the carbon nanotube under the action of a condensing agent. Polybasic fatty amine with flexible structure. Mix epoxy resin and carbon nanotubes by hot melt method, high-speed stirring, ultrasonic treatment, add aromatic amine to solidify and form, and prepare carbon nanotube / epoxy resin composite materials, and test their tensile and impact properties. The beneficial effects of the present invention are as follows: Grafting multiple aliphatic amines on the surface of carbon nanotubes improves the surface functionalization efficiency of carbon nanotubes, reduces the surface energy of carbon nanotubes, reduces the agglomeration of carbon nanotubes themselves, and promotes carbon nanotubes The tubes are dispersed in the epoxy resin; the active amine groups introduced on the surface of the carbon nanotubes enhance the affinity of the two, and through the chemical reaction with the resin, the carbon nanotubes and the epoxy resin are organically connected. The preparation process of the invention is simple, and the prepared composite material has excellent mechanical properties, which is convenient for the industrial application of the carbon nanotube in the future.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube / epoxy resin composite material. Background technique [0002] Epoxy resin (EP) has been used abroad since the 1930s. After more than 60 years of development, the variety, quality and application of epoxy resin products have entered a mature stage. Epoxy resin contains a variety of polar groups and highly active epoxy groups, so it has strong adhesion to metals, glass, cement, wood, plastics and other polar materials, especially materials with high surface activity At the same time, the cohesive strength of the epoxy cured product is also very large, so its bonding strength is very high. When the epoxy resin is cured, basically no low-molecular volatiles are produced, and the volume shrinkage of the adhesive layer is small, about 1% to 2%, and can be reduced to less than 0.2% after adding fillers. It has good compatibility and reactivity with various organic substances (monomers, resin...

AI Technical Summary

Problems solved by technology

Due to the few surface defects and the lack of active groups of carbon nanotubes, the solubility in various solvents is very low

In addition, there is a strong van der Waals attraction between carbon nanotubes, coupled with its huge specific surface area and high aspect ratio, making it easy to agglomerate or entangle, which seriously affects its application.

Traditional carbon nanotube / polymer composite materials adopt the method of physical filling or coating, that is, simple physical blending of carbon nanotubes and organic or inorganic materials, which improves the conductivity of the composite material to a certain extent, However, carbon nanotubes are easy to agglomerate and cannot be well dispersed in the composite material, causing defects inside the composite material, and sometimes even reducing the mechanical properties of the material, which seriously affects its application.