The slow development of low-pollution coating technology derived from the key "stuck".

the development of low-pollution coating <p> variety is an important direction for the coatings industry, the community voice is higher, but the rate of progress is not satisfactory. .In addition to the customary use, policy supporting the poor and other reasons, the technical key "stuck" is also an important reason. .</ P> <P> <P> <p> 1, water-based paint </ p> <p> 1.1 automotive coatings. .From the surface treatment, primer, coating, paint is water-based background, and paint (or varnish) has not been water-based. .These varieties have been foreign and domestic not been reported. .</ P> <p> 1.2 water-based coatings. .2007 National sales of more than 70 million tons of wood coatings, including water-based paint is less than 1 million tons, accounting for 1.4%. .The water-based coatings and other countries in Western Europe 20%, the gap is larger. .</ P> <p> 1.3 Polyurethane (PU) coating. .Which accounts for a large proportion of wood coatings, but the slow progress in water technology. .. .Waterborne two-component PU coating performance, but the curing agent is aliphatic polyisocyanates, dependence on imports, and high prices. .Large output of domestic MDI, hydrogenated MDI hopes the introduction of products and can be used as water-based PU paint curing agent, to change the situation of imports alone. .</ P> <p> 1.4 Single Component Waterborne PU coatings. .Its hardness, solvent resistance, water resistance and other properties not meet export requirements and price (wood furniture export volume), the main problem is the realization of PU resin. .</ P> <p> 1.5 water-based anti-corrosion coatings. .Its bridges, railways, steel and so on are large-scale outdoor application requirements, the current performance of some solvent-based anti-corrosion coatings less than similar level of performance is the lack of qualified water-based preservative resin. .</ P> <p> 1.6 water-based alkyd paint. .Alkyd paint is still the backbone of the coating products, and further development of competitive vitality. .Especially its use of renewable vegetable oil as the main raw material, is currently promoting the development of the coating species. .Waterborne the direction of its development, from the 20th century, early 60s, began development of the domestic water-based alkyd paint, and for a time as the State Science and Technology, Ministry of Chemical Industry of the research project, but has not yet been a large number of industrial applications. .Reduced viscosity in storage, "loss of dry" and other issues, foreign Despite the settlement, but the domestic are still being resolved, some of the performance (such as water resistance) has yet to reach similar levels of solvent-based alkyd paint. .</ P> <p> abroad has opened up alkyd - modified acrylic hybrid approach, progress faster, less domestic research. .</ P> <p> 2, powder coating </ p> <p> annual consumption of powder coatings in China has already more than 700,000 tons, ranking first in the world, but can be a thin coating, low temperature curing, high durability and high decorative .powder coatings and other species, the domestic price is still a lack of suitable varieties. .</ P> <p> domestic powder coatings are still widely used toxicity greater TGIC (isocyanate trimer three glycidyl), foreign companies have used low toxic powder coating instead of curing agent, there is a gap here. .</ P> <p> 3, radiation-curing coatings </ p> <p> use more of ultraviolet (UV) curing. .UV curable coatings domestic middle and low double-digit growth in recent years, but the paint, the shape of the UV curing of complex workpieces has been slow. .Water-based coatings, UV curable coatings in automotive research and testing stage. .UV curing without photosensitizer new technology has not been reported. .</ P> <p> high solids and solvent-free coatings industry reported less domestic. .</ P>.