After the human body inhales quantitative organic solvents, it will also cause damage to the circulatory system, central nervous system, liver and lungs. These organic substances enter the atmosphere and react with nitrogen oxides to produce photochemical smog harmful to the human body, which seriously pollutes the atmosphere, affects the growth of organisms and human health. In addition, the death of forests is also related to the pollution of the atmosphere by organic solvents. Nowadays, the developed countries in the world have laws governing the organic solvent volatilization (VOC) of paints. For example, the European VOC must be lower than 459/n1, and the German v0C must be lower than 409/n12. Under such strict regulations, automotive paint specialists either adopt new VC paints or modify equipment to recover solvents. However, the cost of recycling solvent equipment is huge, and the use of recycled solvents is difficult. Therefore, the use of new paint has become the only way out. In fact, automotive painting is developing toward aqueous electrophoretic primers, waterborne intermediate coatings, and topcoats. Below, the author discusses the performance comparison of waterborne coatings and other coatings. Performance Comparison of Waterborne Coatings and Other Coatings The environment-friendly coatings represented by low-solvent, solvent-free coatings mainly include the following types: 1. Water-soluble coating 2. Water dispersion coating: Coating/cure coating 3. Low-solvent high-solids coating 4 Powder Coatings 5. Radiation Curing Coatings The research and development of waterborne coatings in China began in the 1960s. Due to the compatibility and protection of the coatings with the environment, the country has vigorously supported the development of water-based coatings after the 1990s. Water-based coatings and market share have rapidly increased. Coatings that use water as the solvent or dispersion medium are called water-based coatings. After the 1990s, water-based paints have formed a large-scale, versatile, multi-purpose paint system, becoming the most promising environmental protection paint variety in the 21st century. The annual growth rate of industrial water-based coatings is 6% 8%, they account for 5% of total coatings (including electrodeposition coatings), while emulsion coatings (including resin-bonded mortars) account for 40%, with particularly rapid growth in industrial dispersion. Coatings only account for 2% of the paint market, 3%. Water-soluble and emulsion coatings share the same level of viscosity and other important properties as traditional solvent coatings. Organic matter release from various coating systems Organic matter release from coating system (expressed as percent of solids) Traditional liquid coating (solid content 50%) 100% Medium solid content liquid coating (solid content 60%) 67% Solid content liquid coating (solid content 70%) 43% secondary solid content liquid coating (solid content 80%) 25% water-soluble resin coating 5% 25% water-based dispersion coating 3% organic release amount of various coating systems 2, for water-based paints, the organic solvent release is characterized as: E = dpw off / wE unit area paint film organic solution release; unit g / In2, p paint film density; unit g / ln2w well coating organic Solvent content; w coating mass fraction; d paint film thickness The water-based coating used as a solid content of approximately 50%, containing 2% of the organic solvent 12% water-based paint, in terms of solvent release and solids content in 75 %90% solvent coatings (low solvent high solids coatings) are comparable. Currently used water-based paints have lower organic solvent emissions than most solvent paints because solvent paints have a very low solid content of more than 70%. According to reports, German auto production was 500,000 in 1991 and the amount of paint used was 100,000 tons. Discharge of 50,000 tons of volatile organic solutions, and the European automotive coating industry data more than doubled, that is, every year to the atmosphere to discharge toxic solvents 100,000 tons. It is clear that solvent coatings are the most energy intensive, while water-based coatings are comparable to high solids coatings. In addition, the safety performance is good, and the use of water-based paint has the highest safety factor. Since the solvent of water-based paint is water instead of flammable solvents, there is no risk of burning explosion during construction. For solvent-based coatings, drying and heating are quite dangerous due to the presence of organic solvents. Moreover, in order to overcome the danger of explosion, the air circulation rate (amount) of the solvent coating heating (baking) must be particularly large to carry away the volatile solvent, making it below the explosion limit. In this way, water-based paint can save a lot of energy. Electro Hydraulic Crane,Manual Anchor Windlass,Electro-Hydraulic Crane,Hydraulic Crane TAIXING HAITAI GLOBAL TRADE CO.,LTD , https://www.jiangsuhaitship.com