High-gloss self-cleaning powder coating and preparation method thereof

Abstract

The invention discloses a high-gloss self-cleaning powder coating and a preparation method thereof. The high-gloss self-cleaning powder coating is prepared from components in parts by mass as follows:30-50 parts of hydroxyl-terminated polyester resin, 3-15 parts of fluorocarbon resin, 15-75 parts of a curing agent, 1-10 parts of modified nano-silica, 0-2 parts of pigment, 10-40 parts of filler and 0-15 parts of auxiliaries. The powder coating has excellent hydrophobic performance, further has the characteristics of good weather resistance, high gloss and high adhesion and impact resistance, and can be applied to surface coating of outdoor equipment, guardrails, advertising boards and the like and surface coating of indoor equipment, range hoods and the like.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a high-gloss self-cleaning powder coating and a preparation method thereof. Background technique [0002] With the increasing air pollution and dust pollution, surface coatings such as road guardrails and advertising display boards in cities are suffering from more and more serious erosion. These require constant cleaning to ensure the cleanliness of the coating surface and the cleanliness of the entire city. This process requires a lot of manpower and material resources. In addition, at present, most of the surface of household range hoods and metal dining tables are sprayed with powder coatings. This coating part uses polyurethane system, which is expensive, and part of it uses ordinary indoor powder coatings. Oil stains are not easy to clean and require frequent cleaning. The cleaning process not only causes waste of water resources, but also consumes a lot of manpower. Theref...

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Problems solved by technology

[0003] CN105482633A discloses an easy-to-clean powder coating of an epoxy polyester system, wherein the epoxy resin has poor weather resistance, and calcium carbonate is also prone to chalking and falling off when used outdoors. Therefore, the powder coating disclosed in this patent It is not suitable for outdoor use; and CN107760170A discloses a preparation method of self-cleaning powder coating, but wherein adopts novolak epoxy resin, the weather resistance of novolac epoxy resin is general, also prone to chalking, falling off, etc. when used outdoors Bad problem, thus lose the self-cleaning function of coating; CN103194140A discloses a kind of self-cleaning super-weather resistant powder coating and preparation method thereof, wherein adopted anatase type titanium dioxide, after receiving ultraviolet ray irradiation, anatase type titanium dioxide will The electron-hole pairs are formed, and the oxygen on the surface of titanium dioxide captures electrons to form negative oxygen ions. The negative oxygen ions have strong oxidation ability and can decompose carboxyl-terminated polyester resins and some inorganic substances. In addition, the patent is a carboxyl-terminated polymer The ester system and the fluorocarbon resin system are mixed and used, and then sprayed on the surface of the workpiece. Since the sprayed coating is a mixture, during the reaction process, the reaction time of the carboxyl-terminated polyester system is faster, while the fluorocarbon system is slower. , cross-linking and curing have been formed in the coating, so it is impossible to float down to the lower part of the coating, and there is still a part of the carboxyl-terminated polyester system in the upper part, which is easily oxidized by ultraviolet radiation and chalking, etc. In addition, due to the excellent weather resistance of the fluorocarbon resin system, the patent CN103194140A does not use pigments and fillers with excellent weather resistance in the polyester system

Therefore, the cured coating after mixing the powders of the two systems will affect the service life of the coating in practical applications due to the short board of some materials, resulting in powdering of the coating, thereby reducing or losing the self-cleaning function

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