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Basic introduction to Chongqing waterborne coatings
- 2019-04-11 -

Chongqing waterborne coatings are increasingly used in surface coating construction in China. Waterborne coatings, as the name suggests, are water soluble coatings. Oily coatings, ie solvent-based coatings, are insoluble in water when passing through hydrocyclone venturi tubes and water curtain cabinets. They are suspended or diffused in water. Waterborne coatings are soluble in water and produce wastewater. The oily coating is suspended or diffused in water. Untreated wastewater, but the treatment process and treatment principle of the two wastewaters are different. The treatment of oily paint wastewater is filtration and pressure filtration. It is a mature physical process and is easier to handle. The water-based paint wastewater is dissolved in water. At present, the physical process of the wastewater treatment is MEMBR. Reverse osmosis process, membrane reverse osmosis process is more complicated, if formed by chemical methods, the cost is high. It is higher and brings a lot of trouble. That is to say, the water-based paint is used in the coating process, the dry-spraying technique is used in the painting room, and the dry filter is used to intercept a functional group of a solid substance such as a pigment, titanium dioxide, and a liquid substance such as an aqueous resin. Since 80% of the aqueous coating diluent is water, the content of non-methane hydrocarbons in the exhaust gas will be less than 20 mg/m, which is good. 95% of waterborne coatings are waterborne. 20% to 5% of the solvent is an alcohol, a small amount of ethers and very few additives. The role of the additive is to change the surface tension of the aqueous resin and improve the adhesion of the aqueous coating. Therefore, it is recommended that companies that are ready to use waterborne coatings later should establish a dry coating production line. Primers, intermediate paints, and colored paint lines should not use zeolite runners to reduce losses when replacing waterborne coatings. Since aqueous glazing cannot be achieved in a short time, it is conceivable to use a zeolite runner for surface glazing.

Chongqing water-based paint is a thinner in solvent-based paints, not water-based paints, and will not damage the ecological environment. As a diluent, it will completely evaporate during the curing of the film. This has no meaning for the film, it can be said to be a waste of resources. It can also be said that water-based paint is a resource-saving paint variety. Waterborne coatings can be applied to wet substrates or wet environments. For the painting tools used, it is not necessary to use solvent cleaning, and it can be directly cleaned with water, and there is no solvent consumption during construction. Electrophoretic coating can be applied to complex components, other difficult to paint parts (cavities, corners, welds). The above points are important reasons for the development of environmentally friendly high pressure water-based coatings. However, actual waterborne coatings are not completely free of VOC emissions. In order to improve the physical and chemical properties of waterborne coatings and solventborne coatings, it is necessary to add some additives to make up for their shortcomings. Therefore, most of the additives are organic compounds and are volatile organic compounds. It inevitably releases VOCs. However, the proportion of organic volatiles in aqueous coatings is relatively small compared to solvent-based coatings. The content of organic volatiles in waterborne coatings is about 10-15%.

Chongqing waterborne coatings are also widely used in paper coatings, plastic coatings, glass coatings, etc. However, the technical performance of many coating companies is becoming more consistent. It is difficult for them to achieve a differentiation strategy. Many companies ignore independent technological innovation. Fortunately, China's coating products market has great potential for development and has a lot of room for development. Only by grasping technological innovation can enterprises maintain their position in the industry, enhance their competitiveness, and improve their economic efficiency. With the sustained and rapid development of China's economy, the large-scale construction of infrastructure and the increasing awareness of environmental protection, the coatings industry is bound to move towards a healthy, environmentally friendly and water-based road. The waterborne coatings industry is bound to usher in a broader development prospect.