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At present, these coatings generally use organic resin varnish as a film forming material (such as polyurethane varnish, alkyd varnish, etc.), copper gold powder, carbon black, iron red, etc. as the main color, filler, through adjusting the color of the paint to achieve copper effect. The main defects of these coatings are: (1) The coating is mainly made of organic resin, so it has a plastic gloss and does not have the metallic luster and texture of real metal products, so the simulation is not high; (2) the surface hardness of ordinary organic resin coatings is low , easy to scratch damage, not wear, long-term wear after losing the original luster; (3) poor outdoor weatherability, easy yellowing film, powder, weather resistance only six months to a year or so, not suitable for outdoor sculpture coating; (4) When the organic resin paint is used for interior decoration painting, there is a large amount of volatile organic solvent, residual plasticizer, and curing agent, which is harmful to human health and does not meet the requirements of environmental protection.
The invention aims at the above-mentioned shortcomings of the organic resin paint for imitating copper decoration, and develops a water-based inorganic imitation copper coating with high simulation and outdoor durability, which is suitable for indoor and outdoor decoration, does not pollute the environment, and has good decorative effect. The current domestic and foreign research has not yet seen the use of water-based inorganic coatings for copper decoration.
The water-borne inorganic copper imitation coating developed by the Department of Science and Technology of the Central China Normal University was mainly composed of a lithium silicate aqueous solution (lithium water glass) and an acrylic emulsion, and added dispersants, defoamers, and thickeners. The additives are pure copper powder, pure tin powder, zinc powder and other metal powders as the main pigments, together with zinc oxide, talcum powder and other pigments. After the components are mixed in proportion, they can be sprayed and brushed on the surface of the accessories. After the film is fully dried (normal temperature 250C, 4 hours), wipe with a special metal wipe on the surface of the coating film, you can get a bright and clean new metal texture coating.
The imitation copper paint developed by the present invention has the following features: (1) High degree of simulation. By adjusting the proportion of different metal powders in the formula, copper alloys such as bronze and brass can be imitated. The coating metal obtained by special methods has strong texture, real metallic luster and good decorative effect. (2) High hardness. After curing, the surface hardness of the coating is high (the pencil hardness reaches 6h or more), abrasion resistance, scratch resistance, and the stronger the metal feel on the surface, the more it wipes. (3) Outdoor weather resistance is good. The coating film has strong water resistance (water resistance can reach more than 2000 hours), does not turn yellow, and has strong bonding with cement products and steel products, so the outdoor durability can reach more than 10 years. (4) No pollution. The water-based inorganic coating uses water as a solvent and does not volatilize organic solvents during the drying process of the coating. It is harmless to the human body and is suitable for interior decoration. (5) high temperature, non-flammable. Can withstand 300-4000C high temperature, and non-flammable, suitable for indoor and high temperature occasions.
Copper-based water-based inorganic paint successfully developed
Various kinds of bronze utensils, decorations and sculptures are deeply loved by people. Nowadays, people replace the real copper alloy products with paints that mimic brass and bronze on various non-metal or black metal surfaces. Especially in recent years, some large squares, large-scale imitation bronze sculptures, relief sculptures, and imitation copper crafts inside and outside the hotel have been used to coat the surface of cement products with imitation copper paint.