Electrostatic spraying powder and application method thereof in sealing copper gate valve

Abstract

The invention discloses electrostatic spraying powder and an application method thereof in a sealing copper gate valve, and relates to the technical field of electrostatic spraying powder. The electrostatic spraying powder is prepared from the following raw materials in parts by weight: 60-65 parts of epoxy resin, 15-20 parts of modified rosin resin, 12-15 parts of nanometer ceramic powder, 10-12 parts of nanometer calcium carbonate, 10-12 parts of dodecanol ester, 8-10 parts of polyvinyl chloride, 8-10 parts of organic bentonite, 5-8 parts of nitrocellulose, 5-8 parts of zinc oxide, 3-5 parts of o-hydroxy phenyl benzoate, 3-5 parts of naphthenic acid soaps, 2-3 parts of tributyl phosphate, 2-3 parts of cetyl trimethyl ammonium chloride, 3-5 parts of castor oil oxide, 15-20 parts of butyl acetate and 20-25 parts of water. The electrostatic spraying powder suitable for the sealing copper gate valve, which is disclosed by the invention, is prepared through the addition of various coating additives by taking the epoxy resin and the modified rosin resin as main raw materials and carrying out modifying treatment by adopting the nanometer ceramic powder and the nanometer calcium carbonate, and a coating obtained after the electrostatic spraying powder is sprayed not only has high anti-corrosion property, but also achieves the smoothness and flatness of a surface, so that the beautiful degree of the valve is increased.

Description

Technical field: [0001] The invention relates to the technical field of electrostatic spraying powder, in particular to an electrostatic spraying powder and an application method thereof in a copper-sealed gate valve. Background technique: [0002] Powder electrostatic spraying technology has been used in the valve industry for a long time. In recent years, both powder and spraying equipment have greatly improved in performance and technology. The most widely used electrostatic spraying in valve coating is for soft seal valves. Spraying, because the production process of the soft seal valve is simple, the process is less, and the production technology is easy to master. As the market has higher and higher requirements for valves, many application fields have proposed that the surface of metal-sealed valves should also be sprayed with electrostatic spraying. On the one hand, it is necessary to improve the anti-corrosion performance of the valve and prolong its service life. ...

AI Technical Summary

Problems solved by technology

Because the workpiece should be heated to about 250°C before spraying, and a layer of anaerobic adhesive for metal should be coated in the sealing groove of the copper ring when it is pressed into the valve seat and gate plate to increase its sealing reliability, but at 250 ℃ will cause the glue to fail, and the copper ring will be slightly deformed at high temperature, which will greatly affect the sealing effect of the gate valve

In order to solve these problems, we adopt the method of spraying first and then assembling. After the valve seat and gate are sprayed, they are transported back to the finishing workshop for pressure ring, assembly and pressure test. In this way, the qualified rate of assembly can be increased to 95%. However, a new problem has emerged, that is, due to the poor adhesion of the coating, it is easy to cause damage and peeling off of the coating during handling and assembly, which affects the anti-corrosion performance and aesthetics of the valve.

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