Epoxy Powder Coating

  The powder coating process requires some specialized equipment. The powder used can be one of two types: thermoplastic or thermoset. Thermoplastic powder becomes softer and more liquid when heated. In this case, there is no chemical bonding, which makes this form of powder coating reversible and reusable. Thermoplastic coatings are thicker and more durable than thermoset coatings, and for this reason, they are used on everything from refrigerators to auto parts to metal fencing.   Thermoset powder coatings work a little differently. They form chemical bonds when cured, which means they cannot be recycled in the same way thermoplastics can. They are ideal for high heat areas, as these bonds make them unlikely to melt away as thermoplastics would in the same situations. Thermoset coatings are often the cheaper of the two.   Once the type of coating is decided, the first step in the powder coating process is preparation. This is perhaps the most important part of any project, as it will determine how well the powder coating adheres to the surface it is intended to protect. Preparation can involve sandblasting as well as using a primer before applying the powder coating.   Powder coatings are usually applied using an electrostatic gun, which charges the powder before it is sprayed onto a surface. Then, the powder is sprayed onto the desired surface using compressed air. After the powder has coated the object’s surface, curing can begin, during which time the surface is heated to allow the powder to melt and form a film. Once it cools, the coating hardens, and the process is complete.   There are other methods of applying powder coatings, though they can be problematic or are only suitable for certain types of projects. For example, a metal surface may be heated prior to applying the coating, which allows the powder to melt on contact. The problem here is that it may cause excess powder to run, which creates more work and may require the process to be redone. Electrostatic fluidized bed coating is another method of powder coating and is a dipping process that cannot be used on larger pieces.

With the "green and sustainable development" gradually become the mainstream of industrial development. How to integrate into the construction of transportation and achieve high-quality development of transportation has become a topic of common concern in the industry. Reasonable selection of coating process is very important to prolong the life of high-speed facilities. The data show that the highway guardrail is made of steel pipe and steel column processing and painting, and its surface coating is exposed to the atmosphere all year round. In the outdoors to withstand the sun exposure, rain and snow erosion, seasonal temperature changes and other media erosion, resulting in economic losses are very surprising.   Therefore, it is increasingly important to reduce the waste of resources caused by corrosion, improve the sustainable development ability of expressways, improve the safety, reliability, aesthetics and prolong the service life of steel components. The coating of the guardrail should not only resist corrosion and weather, but also have sufficient mechanical strength. Although the current anti-corrosion treatment technology, such as hot dip galvanizing, hot dip aluminum plating and other processes have been very popular, but with the progress of the era, the concept of "green, environmental protection" has gradually been recognized by people, people realize that the large-scale open hot dip plating is a kind of high energy consumption and high pollution industry. This eliminated the workshop process, and turned to the development of "environmental protection and energy saving" new technology. The electrostatic spraying process can effectively reduce the high temperature and heat loss required for molten zinc ingots and aluminum ingots. At the same time, the automatic spraying line of powder coating improves the product quality and efficiency, reduces carbon emissions, and has very important economic and social benefits for the construction of resource-saving and environment-friendly transportation. Therefore, powder coating is now used, that is, "epoxy zinc rich powder + polyester powder" process.   Powder coating not only has a good effect, its simple and generous design can also be naturally integrated into the landscape with the highway, reflecting the harmonious development of the road and the environment.