Conducting paint

Abstract

The invention provides a conducting paint which comprises 1-8 wt% of graphene, 0.1-1 wt% of functionalized graphene, 15-30 wt% of epoxy resin and curing agent, 0.2-1.5 wt% of wetting dispersant, 0.1-0.5 wt% of defoaming agent, 0-30 wt% of conducting filler and the balance of solvent. The functionalized graphene is amino-containing functionalized graphene or sulfhydryl-containing functionalized graphene. The functionalized graphene contains amino or sulfhydryl group, and therefore, can be better dispersed in the system, and the amino or sulfhydryl group can react with epoxy group in the epoxy resin, thereby enhancing the binding force of the coating; and besides, the graphene has a flake structure and a large radius-thickness ratio and is arranged as a plurality of layers in the coated film in parallel, and therefore, the conducting paint has favorable conductivity and adhesiveness.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a conductive paint. Background technique [0002] Conductive coatings refer to a class of functional coatings that are coated on non-conductive substrates to enable them to conduct current and eliminate accumulated static charges. Conductive coating is a special coating. With the development of industrial technology and the improvement of various electrical performance requirements, the application range of conductive coating is becoming wider and wider. Conductive coatings are mainly composed of conductive fillers, resins, diluents and additives. Among them, the conductive fillers are generally metal powders such as silver, copper, and nickel, and non-metallic powders such as conductive carbon black, graphite, and oxides. There are mainly two deficiencies in the preparation technology of existing conductive coatings: the one is that the conductive filler is not ideal...

AI Technical Summary

Problems solved by technology

There are two main deficiencies in the preparation technology of existing conductive coatings: the one is that the conductive filler is not ideal enough. Although the silver-based conductive property is better, the price is expensive and the phenomenon of silver migration is easy to occur; the copper-based filler is low in price and good in conductivity. The shielding effect is good, but the anti-oxidation stability is extremely poor, and special treatment is required; the performance of nickel-based fillers is more stable than that of copper, and the conductivity is an order of magnitude lower than that of copper-based fillers. The shielding effect is not obvious, and the anti-oxidation stability is slightly poor; the price of conductive carbon black filler is extremely low, the chemical stability is good, and the dispersion is good, but the conductivity is more than 3 orders of magnitude lower than that of copper, and most of them are used for conductivity requirements. In low occasions, the effect of shielding paint is not very ideal

The publication number is CN101508855A Chinese patent discloses a water-based graphite conductive coating and its preparation method, its adhesion is 2~3 grades, the volume resistivity of the coating is 0.2~0.35Ω·cm, and the adhesion is poor

However, using graphene alone as a conductive filler for conductive coatings has problems such as difficulty in dispersion, poor compatibility with resins, and poor wet adhesion. Therefore, it is of great significance to develop a conductive coating with good conductivity and excellent adhesion.

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