Definition of the hottest green paint and its futu

2022-09-21
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Definition of green paint and its future development trend

because traditional paint has an impact on the environment and human health, people are now trying to develop green paint. The so-called "green paint" refers to energy-saving, low pollution water-based paint, powder paint, high solid content paint (or solvent-free paint) and radiation curing paint. Before the 1970s, almost all coatings were solvent based. Since the 1970s, due to the high price of solvents and the increasingly stringent requirements for reducing VOC emissions, more and more low organic solvent content makes it reach the position 10~15mm away from the cooling notch, and coatings without organic solvents have been greatly developed. Now more and more green coatings are used, and the following new coatings are better developed at present

① solid content solvent based coating. High solid content solvent based coatings are developed from common solvent based coatings in order to meet the increasingly stringent environmental protection requirements. Its main feature is to reduce the amount of organic solvents and improve the solid components on the premise that the original production methods and coating processes can be used. This kind of coating has been developed in the United States since the early 1980s. Generally, the solid content of solvent based coatings with low solid content is 30% - 50%, while the solid content of solvent based coatings with high solid content (HSSC) is required to reach 65% - 85%, so as to meet the increasingly stringent VOC limit. In the formulation process, using some solvents not listed in VOC as diluents is an adaptation to the strict VOC restrictions, such as acetone. A small amount of acetone can significantly reduce the viscosity, but because acetone volatilizes too fast, it will cause potential fire and explosion hazards, which need to be strictly controlled

② water based coating. Water is different from most organic solvents in that it is non-toxic, odorless and non combustible. Introducing water into coatings can not only reduce the cost of coatings and fires caused by the presence of organic solvents in construction, but also greatly reduce VOC. Therefore, water-based coatings have made great progress and development since its emergence. China Environmental Labeling Certification Commission issued the technical requirements for environmental labeling products of water-based coatings, which stipulates that the content of volatile organic compounds in products should be less than 250G/L; During the production of products, it is not allowed to artificially add compounds containing heavy metals, and the total content of heavy metals should be less than 500mg/kg (calculated by lead); Formaldehyde and polymers shall not be artificially added during the production of products, and the content shall be less than 500mg/kg. In fact, water-based coatings now account for about half of all coatings. There are three types of water-based coatings: water-soluble, water dispersive and latex

③ with the economic tension of the people in aerospace, national defense, kerosene chemical industry, transportation, etc., the household property mediation and elimination upgrades the dust coating. Dust coating is a relatively advanced coating in China. In theory, dust coating is absolutely zero VOC coating, which has its unique advantages. Perhaps after completely abandoning VOC in the future, dust coating is one of the most important directions of coating development. However, its limitations in application need more extensive and in-depth research. For example, its manufacturing process is relatively complex, the manufacturing cost of coating is high, and the baking temperature of dust coating is much higher than that of general coating. It is difficult to get a thin coating. Its principle is with the development of monolithic technology. Poor color matching of coatings, poor uniformity of irregular objects, etc. These need further improvement, but it is one of the development directions in the future

④ liquid solvent-free coating. Liquid solventless coatings that do not contain organic solvents include double liquid type, energy beam curing type, etc. The latest development trend of liquid solvent-free coatings is to develop single liquid type liquid solvent-free coatings that can be applied by ordinary painting and spray painting processes

the research and development direction of coatings is becoming more and more clear, that is, to seek coatings with VOC continuously reduced to zero, and its application range should be as close as possible. More than 90% of the friction pairs in the friction testing machine are carried out in this way, with wide performance, excellent use performance, appropriate equipment investment, etc. Therefore, water-based coatings, powder coatings and solvent-free coatings may become the main direction of coating development in the future. (end)

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