Expert: Epoxy paint baking skills
How can the steel barrel industry save energy and ensure the baking quality of epoxy coatings? According to experts from the China Epoxy Resin Industry Association, epoxy-based coatings are one of the finest coatings for metals, and they are also the earliest and most common internal coatings used in the domestic steel barrel industry. In the case of high-temperature baking equipment and baking, the barrel factory has poor control of the process conditions, and it is difficult to ensure that the cross-linking reaction is complete, and it is difficult to ensure that the performance of the epoxy coating is fully reflected. The key to solving the problem is that the baking conditions can be effectively controlled.
One of the main film forming materials for epoxy coatings is epoxy resin. According to experts from the China Epoxy Resin Industry Association, the reactive epoxy group in the epoxy resin structure can be cross-linked and cured with a variety of organic compounds to form a strong three-dimensional network structure. Epoxy coating is used. This property of epoxy resin makes a variety of coatings with different properties. Among all the materials that can be cross-linked and cured with epoxy resins, the epoxy resin and cross-linked butanol-etherified phenolic resin form the best coating and corrosion resistance. However, the cross-link curing reaction between the epoxy resin and the butanol-etherified phenolic resin must be started above 180°C, and if it is only this temperature, it must be maintained for more than 45 minutes.
The cross-link curing reaction under this condition can ensure that only 3 parts of water is released, no other by-products are released during the process, the shrinkage is small, and the cross-linked and cured can have good solid dense network structure film. This can further enhance the coating's adhesion, mechanical properties, corrosion resistance and chemical resistance. However, such reaction conditions are unsatisfactory for the steel drum industry. Therefore, most of the barrel plants use methods to increase the temperature and shorten the time. However, due to the fact that the equipment and baking conditions vary from barrel plant to plant, the conditions are different. It is also very difficult to detect if the epoxy resin and phenolic resin are completely reacted under temperature and time conditions, so it is difficult to ensure that the crosslinking reaction is complete, and it is difficult to ensure that the performance of the epoxy coating is fully reflected.
How can we not only guarantee the complete reaction of epoxy resin and phenolic resin, but also enable the reaction conditions to be effectively controlled? Experts from the China Epoxy Resin Industry Association stated that the problem can be “cautified†properly by adding additives: Adding 5% of the 1491 accelerant to the epoxy coating can make the epoxy resin and phenolic resin capable of 15 minutes at 180°C. Complete reaction (if the temperature exceeds 210 °C, the reaction can be completed in 2 minutes). In this way, not only can the baking conditions of the epoxy coating be effectively controlled, the performance of the epoxy coating can be ensured, but also the baking temperature can be reduced, energy can be saved, and the barrel plant without high-temperature baking conditions can also be produced. Epoxy coated steel drums.
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