Preparation method for carbon nanotube, nickel and aluminum composite powder enhanced polyethylene based composite material

Abstract

The invention relates to the field of polyethylene composite materials, in particular to a preparation technology for a carbon nanotube / nickel / aluminum in-situ enhanced polyethylene based composite material, and aims to provide a method for keeping controllable contents and uniform dispersion and distribution of the carbon nanotubes and metal composite powder in a polymer based composite materialand keeping good interface infiltration of carbon tubes and a base and high binding strength. The method comprises the following steps of: synthesizing CNTs (Carbon Nanotubes)-Ni-Al composite powder with uniformly dispersed CNTs, excellently kept structure and controllable content by using a chemical vapor deposition method; and doping the in-situ composite powder into a polyethylene base by using a melt blending method so as to prepare the CNTs / Ni / Al / polyethylene based composite material with high strength and modulus and excellent conductivity and heat-conducting property. By adopting the composite powder, the proportion of the carbon nanotubes, nickel and aluminum can be controlled excellently; meanwhile, the problem of dispersion of the metal and the carbon nanotubes in the composite material can be solved well; the carbon nanotubes do not agglomerate in the composite powder and are widely dispersed to achieve a nano-size effect; and the carbon nanotubes have high binding strengthwith the base, so that the polyethylene based composite material can be effectively enhanced by the carbon nanotubes and the aluminum, and the comprehensive performances such as strength, conductivity, heat conduction and the like of the composite material are greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of polyethylene-based composite materials, and more specifically relates to the preparation technology of carbon nanotube / nickel / aluminum in-situ reinforced polyethylene-based composite materials. Background technique [0002] With the rapid development of the modern polyolefin industry, polyethylene (Polyethylene, PE) has become the largest synthetic resin product in the world today, playing an increasingly important role in various industries such as national defense and automobiles. However, PE resin has disadvantages such as low strength, poor electrical conductivity and heat resistance, and insufficient barrier properties, which greatly limit the application and development of PE. Therefore, improving the strength, electrical conductivity, and thermal conductivity of PE resin has become one of the problems to be solved in the field of polyethylene materials. [0003] Carbon nanotubes (Carbon Nanot...

AI Technical Summary

Problems solved by technology

The first method is simple, but it cannot solve the problem of the dispersion of CNTs in polymer-based composites and the interfacial infiltration between them and the matrix; although the second method can improve the dispersion of CNTs in polymer-based composites to a certain extent , but the residual solvent is not easy to remove in the solution blending, and the residual solvent in the system will reduce the glass transition temperature of the composite material and damage the mechanical properties; although the third method obtains better dispersion of CNTs in the matrix, but Expensive, complex technology, difficult to apply on a large scale

In addition, since the above methods usually use harsh methods such as strong acid, ultrasound, and high-energy ball milling to pretreat CNTs in the preparation of composite materials, it is easy to cause damage to the perfect structure of CNTs and greatly weaken their excellent mechanical and physical properties. The improvement of the mechanical, electrical and thermal properties of the

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