Water-based electrothermal coating and preparation method thereof

Abstract

The invention discloses a water-based electrothermal coating and a preparation method of the water-based electrothermal coating. The coating comprises a water-based dispersion containing a matrix resin, nickel coated carbon nanotube composite powder and auxiliary materials which can be selectively added, wherein the composite powder comprises a carbon nanotube and nickel coated on the carbon nanotube. The preparation method of the water-based electrothermal coating comprises the following steps: the surface of a carboxylated carbon nanotube is subjected to the adsorption of nickel ions, and the nickel ions are reduced to a nickel elementary substance to be served as a nucleation core, chemical nickel-plating is carried out to form the nickel coated carbon nanotube composite powder, and then the composite powder is mixed with the water-based dispersion containing the matrix resin and ground to obtain a composite dispersion paste, and the composite dispersion paste is further compounded with the other auxiliaries to prepare the electrothermal coating. According to the invention, the contact resistance of the original carbon nanotube network can be greatly reduced, so that the coating has the advantages of being low in resistance, high in electrothermal conversion efficiency and the like, is suitable for being used as various electrothermal coatings driven by low voltage, and further has convenience in construction, safety and environmental protection and wide application prospects.

Description

technical field [0001] The invention relates to a water-based paint and a preparation method thereof, in particular to a low-pressure driven water-based electric heating paint and a preparation method thereof. Background technique [0002] Electrothermal paint is a functional paint that can be coated on the surface of materials such as ceramics, plastics, and textiles, and can generate heat stably under a certain voltage drive. At present, the fillers of electrothermal coatings on the market are mainly metal powder, carbon powder, graphite, etc. These conductive fillers have certain conductivity, but they also have obvious defects: 1. Metal powder has good conductivity, but all It is relatively easy to oxidize, which will seriously affect the electrical conductivity of the coating, and then affect the heating effect of the coating. Although the gold powder and silver powder in the metal powder will not be oxidized, the cost is very high, which seriously limits its practical ...

AI Technical Summary

Problems solved by technology

At present, the fillers of electrothermal coatings on the market are mainly metal powder, carbon powder, graphite, etc. These conductive fillers have certain conductivity, but they also have obvious defects: 1. Metal powder has good conductivity, but all It is relatively easy to oxidize, which will seriously affect the electrical conductivity of the coating, and then affect the heating effect of the coating. Although the gold powder and silver powder in the metal powder will not be oxidized, the cost is very high, which seriously limits its practical application. In addition, due to the density of the metal powder 2. The conductivity of carbon powder and graphite is not as good as that of metal powder. The conductive paint made of this kind of filler has a large resistance value and needs to be used at a higher voltage (higher than 36V voltage). In order to operate normally, the safety cannot be guaranteed. If the resistance value is reduced by increasing the content of conductive filler, the adhesion of the coating will decrease and the service life of the coating will be affected.

However, in this simple mixed addition mode, due to the random distribution of carbon nanotubes and metal nickel powder in contact, and the contact area is small, there is still a large contact resistance between the fillers.

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