Heat-proof powder coating for corrosion prevention of pump valve

Abstract

The invention discloses a heat-proof powder coating for corrosion prevention of a pump valve. The heat-proof powder coating is prepared from the following raw materials in parts by weight: 52-54 parts of hydroxyl polyester resin, 7-8 parts of fluorocarbon resin, 4-5 parts of 1,3,5-triglycidyl isocyanurate, 13-15 parts of nano aluminium sesquioxide, 0.8-0.9 part of perfluorooctyl triethoxysilane, 25-30 parts of an ethanol solution with the concentration of 75 wt%, 0.5-0.6 part of a silane coupling agent kh560, 0.7-0.9 part of dimethyl silicone oil, 0.4-0.5 part of a dispersing agent NNO, 6-7 parts of expansible graphite, 2-3 parts of glass fibers, 9-11 parts of barium sulfate, a proper amount of anhydrous ethyl alcohol and 0.8-1 part of Tween 80. The heat-proof powder coating can be used in high-temperature environments, does not contain toxic raw materials, is simple in manufacturing technology and use method, can be arranged on the surface of a pump valve material via electrostatic spraying, and can improve the high-temperature resistance by improving the coating surface tension.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a powder coating for anticorrosion of heat-resistant pump valves. Background technique [0002] In recent years, the application of powder coatings has surpassed water-based coatings and high-solid coatings in the coatings industry, and has become one of the most widely used coatings in the industry. The powder coating process solves the problems of flammability, explosion and environmental pollution in the traditional paint coating process, and its coating has superior performance, the raw materials can be recycled and reused, and the coating process is simple. It can be widely used in the coating of pump and valve shells. Since the pump valve is a casting or forging, its surface is rough. At present, there are still some defects in the functional powder coating technology for valve surface treatment in the existing technology, which leads to defects such as shrinkage cavities...

AI Technical Summary

Problems solved by technology

Since the pump valve is a casting or forging, its surface is rough. At present, there are still some defects in the functional powder coating technology for valve surface treatment in the existing technology, which leads to defects such as shrinkage cavities, pinholes and severe orange peel in the coating, which in turn leads to The application of pump valves in special fields such as food, biology, pharmaceuticals, chemicals, aerospace and electronics is limited

Moreover, most of the pump valves will be used in high water content, high sand content, strong corrosion medium environment and other factors, which will aggravate the corrosion of the pump valve and make it easier to scale on the pump valve, resulting in short service life of the pump valve and short inspection cycle. , The problem of heavy workload brings inconvenience to the use. The general surface strengthening process mainly includes metal coating, ceramic coating and other coatings. Although the wear is slowed down to a certain extent and the corrosion resistance is improved, they all exist. Disadvantages: the metal coating is easy to delaminate and cause shedding; ceramics have poor impact resistance and are prone to cracking; some polymer coatings have poor mechanical and thermal properties, etc.