How much do you know about environmental friendly epoxy coating?

There are a lot of volatile organic compounds (VOC) in traditional solvent based coatings, which will cause serious pollution to the atmosphere Today, with the increasing awareness of environmental protection, environment-friendly coatings are increasingly showing its importance The application prospect of environmental friendly epoxy resin coating is broad According to the expert introduction of China Epoxy Resin Industry Association ( it mainly includes epoxy powder coating and water-based epoxy coating Among them, epoxy powder coating is widely used in the application of thermosensitive base material and steel structure anticorrosion, and water-based epoxy coating is widely used in tank coating and anticorrosion coating The two green products are expected People feel that it's time to speed up development In terms of VOC reduction, in addition to powder coating, waterborne epoxy coating products are also one of the development directions of environmental protection coatings; however, due to the poor light resistance of a large number of aromatic epoxy resins, waterborne epoxy coatings are mostly used as primer, anticorrosive paint, etc Epoxy resin curing products have excellent physical and chemical properties, especially for their excellent water resistance, chemical resistance and excellent adhesion properties, which are widely used in the field of coatings They are one of the pillar products in the coating industry Therefore, environmental friendly epoxy resin coating is also one of the research hotspots in the coating industry The main way to achieve low VOC is to develop new coatings such as high solid coatings, waterborne coatings, powder coatings and radiation curing coatings Epoxy powder coating is an effective material to achieve this goal According to experts from China epoxy Industry Association ( epoxy powder coating is mainly composed of bisphenol-A epoxy resin, linear phenolic resin modified epoxy resin and aliphatic epoxy resin, which are mixed and cooled at a certain temperature and then crushed It has no pollution, low melting viscosity, solid film, good leveling, no need of primer film, good mechanical properties, excellent reaction activity and storage stability, corrosion resistance, chemical resistance, good color matching, wide selection range of curing agent and wide application range At present, the research focus of epoxy powder coating is mainly used in the coating of thermosensitive base material and anticorrosive coating Among them, the epoxy powder coating used in thermosensitive base material mainly includes UV curing epoxy powder coating and low temperature curing epoxy powder coating Due to the high curing temperature (180-220 ℃) and long curing time (10-30min), the powder can only be applied to heat-resistant base materials such as metals, and it is relatively energy-consuming and time-consuming; moreover, due to the overlap between the melt leveling and the beginning stage of curing, and poor control, the coating will have defects in flatness, such as shrinkage cavity, orange peel and other problems For this reason, UV curable powder coating and low temperature curable powder coating are mainly developed for thermal base materials Experts from China epoxy Industry Association ( said that powder coating is also widely used in corrosion protection of steel structures, and is favored by Europeans It is mainly composed of epoxy (EP) primer and weathering stable top coating, mainly polyester (SP) or EP / SP mixed powder In addition, it has also developed other new application fields, such as heat resistance and weather resistance of powder coating Can have a great improvement At present, there are industrial production of waterborne epoxy resin coating in China, including waterborne epoxy floor coating, waterborne epoxy anticorrosive coating and wood floor coating This research mainly includes three aspects: can coating, anticorrosive coating and other applications According to experts from China epoxy Industry Association ( powder coating and water-based coating have been widely used in can industry, and their shortcomings such as large film thickness, low powder recovery and utilization rate, large investment in early stage of equipment and potential dust explosion are gradually solved In particular, the content of residual bisphenol-A diglycidyl ether (badge) and bisphenol-A in the product is relatively low, which is very important for the lining of food and beverage cans; the water-based coating was first widely used in the construction field, and then it was popularized and applied in the steel structure anticorrosive coating, and the water-based epoxy coating is one of the most successful coating varieties used in the industrial heavy anticorrosive field at present; the water-based epoxy coating Its other applications include the preparation of multi-layer packaging materials, high-strength concrete, and the formation of coatings with different properties.