What is the use of powder coating catalyst

2021-12-03   Pageview:854

Catalysts, also known as curing accelerators. Catalysts are used to catalyze the cross-linking of end-carboxylated polyester or epoxy resin, to increase the reaction speed and reduce the curing temperature. It can also reduce the amount of curing agent added.













In terms of physical and mechanical properties, a large number of glass flakes are filled in the coating of resin-based glass flake coatings to improve the mechanical strength, surface hardness, wear resistance and adhesion; at the same time, the thermal expansion coefficient and curing shrinkage of the coating are reduced, wax emulsion curing compound and Increase the resistance to thermal shock and heat resistance; due to the reinforcing effect of the glass flakes, the expansion coefficient of the cured resin can be reduced by nearly 50% (close to the expansion coefficient of carbon steel), and the curing shrinkage rate is reduced to 1/20~ 1/10. The laser light intensity test results of the epoxy resin glass flake coating show that there is no birefringence, indicating that it has better adhesion and resistance to debonding and peeling than FRP; when used in a wet environment, glass The flake coating basically maintains the original dry hardness, while the hardness of the coating filled with mica powder shows a downward trend after long-term immersion: the heat resistance of the glass flake lining can be increased by 20~40℃ compared with similar resin coatings, so it is often used Petroleum pipelines, hot water pipelines, heat-resistant chemical plants, etc.

In terms of weather resistance, the refractive index of glass flakes is quite different from that of resin, and its surface is slightly curved. It can reflect a lot of ultraviolet rays when arranged in parallel in the coating, thereby reducing the aging of the resin. Accelerated aging tests show that coatings filled with glass flakes are much better than those filled with aluminum powder, mica iron oxide, and titanium dioxide in terms of pulverization weight loss, thinning of the coating film, and loss of original gloss. In terms of dielectric properties, glass flakes are insulators and also have excellent resistance to water vapor permeability. Measurements show that the resin sample filled with glass flakes has a water vapor permeability 10 times lower than that of unfilled resin samples. Therefore, it is in a humid environment. Work has excellent insulation. High corrosion resistance, wear resistance and integrity provide a broad application prospect for resin-based glass flake coatings. According to experts from the China Epoxy Resin Industry Association, it was initially recommended for use in flue gas desulfurization devices to prevent pollution, and then used in marine development projects, buildings, structures, interior cabins, decks, sea water tanks, marine drilling, and oil extraction.

Applications in platforms, bridge steel frames, petroleum storage tanks, chemical engineering equipment, and food fermentation equipment. At present, it has been widely used in some new industrial fields and new uses. If the unsaturated polyester is used to make underwater anti-corrosion glass flake coatings, it will also have long-term underwater antifouling properties when mixed with toxic additives. This is the use of glass flakes to prevent penetration and diffusion to extend the reverse osmosis time of the toxic additives in the coating, so it has a long-term effect. When the glass flake content of the coating is high, the coating is like a highly complete glass body with good wear resistance and impact resistance, so it can also be used as a protective coating for icebreakers. Adding glass flakes to polyacrylic resin can also be made into a heat-insulating coating that can reflect sunlight. It also has good weather resistance and can be used in environments that require heat insulation such as metal roofs, petroleum storage tanks, and granaries.


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