Water-based conductive coating and its application before electrostatic spraying of wood products

Abstract

The invention provides a water-based conductive coating for use before electrostatic spraying of a wood product and an application of the water-based conductive coating. The water-based conductive coating contains a water-based acrylic emulsion, a graphene dispersion liquid, a filler, silane, silica sol, a coalescing agent, a dispersion wetting agent, a defoaming agent, a pH adjusting agent, deionized water and the like. The water-based conductive coating can be applied to conducting treatment before the spraying of the wood product, after the wood product is processed and dried, a compact conductive film layer can be formed on the surface of the wood product, and the surface resistance of the wood product is 104ohm-107ohm. The water-based conductive coating can be used for processing the wood product by virtue of multiple processes, so that the surface pores of a wood product base material can be closed, the surface conductivity of the base material can be improved, the quality of an electrostatic spraying paint film of the wood product can be improved, phenomena of pinholes, bubbles, cracking and the like occurring in flatting and curing processes of the paint film are reduced, and the adhesion force of the wood product base material to the coating is enhanced.

Description

technical field [0001] The invention relates to a pretreatment technology for electrostatic spraying of wood products, in particular to a water-based conductive paint before electrostatic spraying of wood products and its application. [0002] technical background [0003] Powder electrostatic spraying process is a process technology widely used in metal surface coating. Powder coating is widely used in coating production because of its environmental protection, harmlessness, high quality, beauty and durability. Powder-coated wood products have proven to be durable even in extreme environments such as high humidity and heat (such as powder-coated MDF panels to limit formaldehyde release), in addition to being stain and moisture resistant, without peeling or delamination Features. Powder coating is an upgraded alternative to traditional coatings such as melamine panels, laminates, thermoset coatings or liquid coatings. The principle of electrostatic spraying of wood products...

AI Technical Summary

Problems solved by technology

The preheating method is to make the wood product heated to evaporate the internal moisture to the surface, so that the surface becomes conductive and obtains the electrostatic powder absorption ability. However, when the coating is cured, the internal moisture and other volatiles continue to develop in gaseous form when heated, which is easy Causes coating film leveling, bubbles, cracks, etc. during curing, and the preheating method cannot be well adapted to the production of collinear spraying of wood products of various specifications, because it can obtain surface conductivity without destroying the balance of its moisture content , which brings extremely high difficulty to the control of preheating process parameters, and it is easy to induce the quality of product coating film; spraying conductive liquid (agent) or conductive coating can improve the surface conductivity of wood product substrates, and realize electrostatic adsorption at room temperature, but Due to the rough surface of the wood product base material, there are a large number of fine voids and pits, and the conductive liquid cannot completely seal the pores of the wood product base material due to its own characteristics, while the conductive coating solves this problem and avoids the disadvantages of other conductive treatment methods

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