Main types of environmentally friendly pre-treatment
Waterborne coating
Waterborne coatings are water-based coatings that replace volatile organic solvents in coatings. It is divided into two categories: one is water-soluble resin coatings, including electrophoretic coatings, curing at room temperature and drying. Electrophoretic coating has strong swimming ability, good anti-corrosion performance, uniform paint film, high utilization rate of paint, economical safety, less pollution, and can realize fully automated production management. It is widely used in automotive, electrical instrument, home appliance and other primer coating. Installed. The other type is water-dispersible coating. The coating is safe, non-toxic, fast drying, good in air permeability, convenient in construction, easy to clean, and widely used. It is mainly used in printing paints, paper coatings and printing dyes on textiles.
2. Powder coating
Powder coating is a solvent-free coating that is completely different from traditional liquid coating. It has no solvent volatilization during the coating process, is safe, has simple process, saves energy and resources, has no environmental pollution, and has high production efficiency. It is fully in line with international standards. The popular "four E" principle has been developed at a high speed, and China's powder coating production ranks third in the world. Powder coatings are divided into two categories: thermoplastic powder and thermosetting. The varieties are: epoxy powder coating, polythene powder, polyurethane powder coating, ultraviolet light curing powder coating, mainly used for metal coating and wood, etc. Washing machines, refrigerators, air conditioners, instrumentation, metal furniture, office supplies, automobiles, machinery and electrical appliances, oil pipelines, etc.
3. Photosensitive coating
Photosensitive coatings (radiation-curing coatings) generally use ultraviolet (UV)- or electron beam (EB) energy sources to cause liquid chemicals to cure by rapid polymerization cross-linking. Photosensitive coating is an almost solvent-free coating. It has the characteristics of no pollution, fast curing speed, energy saving, suitable for automatic assembly line coating, etc. It has a wide range of applications and rapid development, and is mainly suitable for the surface of substrates that cannot be heated. Painting.
4. In addition, there are high-group coatings, functional coatings and other environmentally friendly coatings.
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