Preparation method of carbon nanotube/wood composite material

Abstract

The invention discloses a preparation method of a carbon nano tube / wood composite material, and the method comprises the following steps: S1, treating a carbon nano tube through concentrated H2SO4 and concentrated HNO3 to obtain a covalent modified carbon nano tube; S2, placing the covalently modified carbon nanotubes in a polyurethane diluent, carrying out ultrasonic dispersion for 20-30 min to obtain a carbon nanotube polyurethane composite component, and taking the carbon nanotube polyurethane composite component as an impregnation liquid, wherein polyurethane is diluted by butyl acetate; S3, placing wood in the impregnation liquid in the step S2, carrying out impregnation curing on the wood through a full cell method, adding a polyurethane delayed catalyst, carrying out pressure maintaining for 20-30 min under the pressure of 0.8-1.2 MPa, carrying out vacuum treatment on the wood subjected to pressure maintaining for 15-20 h under the environment of O.06-0.1 MPa, and then carrying out room temperature curing to obtain the carbon nano tube composite wood. According to the invention, covalent modification is carried out on the carbon nanotubes, so that the carbon nanotubes can be dispersed and fixed in the wood, and the composite wood with high strength is obtained.

Description

technical field [0001] The invention relates to the technical field of wood structure composite materials, in particular to a preparation method of carbon nanotube / wood composite materials. Background technique [0002] Wood is a sustainable and versatile building material. Many projects, such as the Tall Timber Building in Vancouver and the main Olympic stadium in Japan, use wood as the main building material because it has better properties than current building materials such as steel and concrete. economic and environmental benefits. The current wood structure buildings still face many challenges. Natural wood cannot meet the mechanical performance requirements advocated by the Ministry of Housing and Urban-Rural Development of the People's Republic of China in the energy-saving building plan. The mechanical strength of natural wood makes it impossible to apply to medium and high-rise buildings. Therefore, the development of strong, heat-insulating, and energy-saving st...

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Problems solved by technology

[0006] In order to improve the performance of wood, carbon nanotubes can be combined with wood, but there are problems in carbon nanotube composite wood: 1) the aspect ratio of carbon nanotubes is too large, which makes it easy to curl; the diameter of carbon nanotubes is less than 100nm, and the length can reach several Microns or even millimeters have a large aspect ratio, a large surface area makes it easy to agglomerate and entangle, and the surface is chemically inert, making it difficult to disperse uniformly in any solution; 2) When carbon nanotubes are used as composite materials How to improve the dispersion of carbon nanotubes (acidification), how carbon nanotubes enter the interior of wood (impregnation), how carbon nanotubes react with wood (covalently modify carbon nanotubes to make them have hydroxyl groups, etc.) Active groups), how to stably disperse carbon nanotubes in wood (carbon nanotubes are dispersed in solution), how to fix carbon nanotubes in wood (covalently modified carbon nanotubes contain hydroxyl groups and produce chemical reactions with wood hydrogen bonding); 3) How to ensure the bonding interface, good interfacial bonding is required to achieve payload transfer through the CNT / wood interface, which is a necessary condition for improving the mechanical properties of polymer composites

At present, there is no good solution in the market. In view of this, the application proposes a preparation method of carbon nanotube / wood composite material.

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