Process for producing composite electrically-conducting paint

Abstract

The invention discloses a preparation method of a composite conductive coating. SnCl4.4H2O and SbCl3 are taken as raw materials, high-purity barite is ball milled for 1.5 hours to 7.5 hours; chemical coprecipitation method is adopted for produce a precursor SnO2BaSO4 which is intermingled with Sb; SSB composite conductive power is obtained after being baked for 1.5 hours to 2 hours at a temperature of 600 to 900 DEG C after being dried. The SSB composite conductive power is subject to surface modification with a coupling agent; film forming matter with a weight percentage of 27 to 43 percent and accessory ingredient are dispersed fully; 25 to 45 percent of the SSB composite conductive power with modification surface is added into the disperse system for stirring fully. A diluting agent is put into the mixture for mixing and then the new mixture is sand ground and dispersed for 0.5 hour to 1 hour at a high speed; after the impurity is removed, finished product of conductive coating is obtained. The composite conductive coating prepared by the novel method has the advantages of good constructive property, low sedimentation rate of coating, smooth and plane coating surface and good anti-friction and anti-impact property.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to the preparation of conductive coatings. Background technique [0002] Conductive paint is a conductivity of 10 -10 s.cm -1 Above, coatings with semiconductor properties. Conductive coatings are composed of film-forming substances (binders), pigments and fillers, additives and solvents, among which at least one component has conductive properties. As a fluid material, conductive coating can be easily sprayed or brushed on the surface of plastic parts of various shapes to form a conductive electromagnetic shielding coating, so as to achieve the purpose of shielding electromagnetic waves, and has become the most widely used electromagnetic shielding material at present. [0003] According to whether the film-forming substance is conductive, conductive coatings can be divided into two types: blending type and bulk type. The film-forming substance itself has conduct...

AI Technical Summary

Problems solved by technology

To prepare a conductive coating with good performance, the added conductive powder should have good conductivity, high fineness, good compatibility with various resins or emulsions, excellent thermal stability and weather resistance, and low cost. It is difficult for all kinds of fillers to have these characteristics at the same time

Metal fillers have good electrical conductivity but are easily oxidized in the air and are expensive; carbon-based conductive coatings are cheap, but have deep color and poor dispersion stability, which is not suitable for light-colored system coatings; coatings prepared by metal oxide-based coatings have unstable properties ; Composite conductive filler coatings have poor electrical conductivity

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