Environmental friendly polyurethane coating
Affected by the environmental protection requirements and the sustainable development requirements of the whole coating industry, relevant personnel in the industry must actively explore and develop environmentally friendly polyurethane coating products, such as photocurable polyurethane coatings, high solid content low viscosity polyurethane materials, and powder polyurethane materials. Polyurethane coatings presented in the form of powder have good physical and mechanical properties, chemical resistance and good appearance. Water-based polyurethane dispersion resin material has a lot of advantages compared with other structure polymer materials, and meets the environmental requirements, can be dispersed in water, no beneficial isocyanate, non-toxicity, good adhesion to the substrate. Water-based two-component polyurethane coating is composed of water-based polyols containing -OH group and low-viscosity multi-isocyanate curing agent containing -NCO group. 
One component waterborne polyurethane coating is a kind of coating based on waterborne polyurethane resin and with water as dispersion medium. Waterborne polyurethane coatings modified by cross-linking have good storage stability, film mechanical properties, water resistance, solvent resistance and aging resistance, and similar to the traditional solvent based polyurethane coatings, which should be regarded as one of the important development directions of environmental friendly polyurethane coatings. From the perspective of future development trend, polyurethane powder coating has become one of the most mainstream development directions in the whole coating field at present, and the proportion occupied by all kinds of powder coating and polyurethane coating is constantly increasing. As for the car paint processing market, in the coating of the product development process, should with polyurethane powder coating is a good choice and development direction, at the same time, through the way of technology innovation research and development, research and development of low temperature environment has a good adaptability, at the same time without volatile by-products produced by a new generation of polyurethane powder coating, the new type of powder coating on the performance and two-component solvent-based polyurethane coatings have good similarity, can be applied to a new generation of automobile manufacturing and processing production line, coating, coating performance is guaranteed at the same time, reflects the good environmental benefit, has the very considerable comprehensive benefits.