Current Status of Powder Coating Development
Powder coatings, as solvent-free coatings, do not emit solvents during the coating process, making them suitable for environmental protection requirements: the overspray powder during the coating process can be recycled and reused, which helps save resources; powder coating is easy to automate; a single thick coating can reduce the number of spraying times and improve labor productivity; not using organic solvents makes it relatively safe during production and construction. Powder coatings comply with the internationally popular "Four Es" (Economical, Environmental, Efficient, Excellent Performance) principles.
Types of powder coatings
In North America, due to the implementation of total VOC emission limits and the formulation of reduction plans to stop the use of specific solvents (such as xylene, toluene, methyl isobutyl ketone, and methyl ethyl ketone), the development of environmentally friendly coatings such as powder coatings and water-based coatings has been rapid. In 1999, the growth rate of powder coatings reached 12.8%. Outdoor applications generally use two types of powder coatings: polyurethane and polyurea/IGIC; indoor applications mainly use epoxy/polyester mixed powder coatings; epoxy coatings are mainly used for corrosion protection in applications such as oil pipelines. In the automotive industry, powder coatings are mainly used as intermediate coatings, while research is still ongoing for their use as topcoats.
Europe, as the birthplace of powder coatings, accounts for about 46% of the global powder coating usage. European countries have very strict VOC emission regulations, and in the automotive sector, there is a strong push towards water-based and powder-based solutions due to restrictions on the use of organic solvents. Similar to North America, epoxy powder coatings in Europe are mainly used in heavy corrosion protection fields. Epoxy/polyester powder coatings are mainly used in the oil industry. They offer reasonable cost-performance ratios and are widely used in various fields. Polyurethane powder coatings release sealants during baking, producing unpleasant odors, and are hardly used in most European countries except Italy. Polyurea/IUC type powder coatings have excellent weather resistance and are mainly used for aluminum building materials (exterior walls of buildings). However, IUC is mutagenic and has been marked with a "T" label since June 1, 1998, and some countries (such as Germany) have stopped using it. For this reason, IGIC is gradually being replaced by less toxic substances, with two main systems currently available: powder coatings using alkylamide as a curing agent and powder coatings using multifunctional glycidyl ether as a curing agent.
Japan's powder coating market was affected by economic downturns, declining nearly 10% in 1998, remaining flat in 1999 compared to 1997, and growing by 6% in 2000. Resin manufacturers continuously develop new types of resins, maintaining a leading technological level. Epoxy powder coatings are mainly used in heavy corrosion protection fields; indoor applications mainly use epoxy/polyester powder coatings; weather-resistant varieties mainly use polyurethane powder coatings; acrylic powder coatings have begun to be used in automotive coatings due to their excellent film appearance, weather resistance, low-temperature curing, and stain resistance. Polyester/IGIC type powder coatings, besides inducing mutations and lesions, can also cause allergies in operators and are restricted in Japan, leaving little room for future development. Currently, some companies have developed polyurea powder coatings that do not use TTGICS. With the economic recovery and the improvement of environmental regulations, if we estimate based on the situation in Europe and the United States, Japan's powder coating market should grow to 2-3 times its current size in the next few years.
Due to market openness and rapid economic growth, China's powder coating industry has developed rapidly. Since 1995, manufacturers from Taiwan and Europe and the United States have actively invested in building powder coating and raw material manufacturing plants in mainland China. The awareness of the domestic coating industry gradually shifting from solvent-based coatings to powder coatings has increased, and extensive communication activities within the industry have brought opportunities for the development of powder coatings. In 2000, China's powder coating production was about 96,000 tons, ranking third in the world after the United States and Germany, with market growth rates maintaining double digits in recent years. The product variety is dominated by epoxy/polyester powder coatings, with epoxy and polyester powders making up the majority. Polyurethane powder coatings are relatively rare.
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