Method for preparing carbon nanotube static conductive coating on surface of EVA thin film

Abstract

The invention relates to a method for preparing a carbon nanotube static conductive coating on the surface of an EVA thin film, which comprises the following steps that: first, a carbon nanotube is added into ethanol solvent with the concentration more than or equal to 60 vt percent to be stirred into suspension under the action of dispersant and binder, ball milled to prepare dispersion liquid; and the dispersion liquid is oscillated in ultrasonic wave at 20 to 40DEG C, diluted and sprayed onto the surface of the EVA thin film, dried and cured to prepare the carbon nanotube static conductive coating. The method has simple process and is convenient to operate, and the prepared coating does not fall off or cohere after being used for a long time.

Description

1. Technical field [0001] The invention relates to a method for processing a functional coating on the surface of a film, in particular to a method for preparing a carbon nanotube electrostatic conductive coating on the surface of an EVA film. 2. Technical Background [0002] EVA (ethylene-vinyl acetate copolymer) has the characteristics of good flexibility and rubber-like elasticity. Its film products have sealing, adhesiveness, softness, toughness and shrinkage, and are suitable for elastic packaging films. Heat shrinkable film, agricultural film, food packaging film, laminated film, etc., when EVA film is used in the packaging of electrical appliances and electronic products, the film is required to have certain antistatic properties. [0003] The traditional production process is to add a large amount of conductive agents such as carbon black to it, which is complicated in process and requires high equipment, which affects the performance of EVA film. As a new type of n...

AI Technical Summary

Problems solved by technology

The physical mixing is that carbon nanotubes and EVA substrates are blended together through ultrasonic oscillation, mechanical stirring, adding surfactants, etc., and then melted at high temperature and drawn into a film. However, many studies have shown that first, physical mixing cannot achieve Ideal dispersion effect. Second, the dispersion of carbon nanotubes in the EVA substrate in physical mixing is also a static weak equilibrium. Once the temperature of the material rises and the thermal movement of molecules intensifies, the dispersed state of carbon nanotubes will be destroyed. reunion

The chemical compounding is to modify the surface of carbon nanotubes, use oxidants to attack the surface defects and both ends of carbon nanotubes, make them bring oxygen-containing groups, and then in-situ compound the modified carbon nanotubes and EVA substrate , drawn into a film after melting, but the difficulty is that the oxidation of carbon nanotubes and the in-situ composite process with the EVA substrate are quite complicated, difficult to control, high in cost, and difficult to truly realize industrial application