Common knowledge of coatings: advantages and disadvantages of Waterborne Coatings

Core tip: waterborne paint is a relatively new type of paint in the current paint market Many people do not have a correct understanding of waterborne paint Compared with solvent paint, waterborne paint has the following characteristics: Advantage: 1 The water-based coating uses water as solvent to save a lot of resources; the water-based coating eliminates the risk of fire during construction; reduces the air pollution; the water-based coating only uses a small amount of low toxic alcohol ether organic solvent to improve the working environment The organic solvent of general waterborne coatings is between 10% and 15%, while the current cathodic electrophoretic coatings have been reduced to Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: waterborne coating is a relatively new type of coating in the current coating market Many people do not have a correct understanding of waterborne coating Compared with solvent paint, waterborne coating has the following characteristics: 1 Waterborne coating uses water as solvent, saving a lot of resources; waterborne coating eliminates the risk of fire during construction; The water-based coating only uses a small amount of low toxic alcohol ether organic solvent, which improves the working environment The organic solvent of general water-based coating is between 10% and 15%, while the current cathodic electrophoretic coating has dropped below 1.2%, which has a significant effect on reducing pollution and saving resources 2 The water-based coating can be applied directly on the wet surface and in the humid environment; the water-based coating has good adaptability to the material surface and strong adhesion 3 Water based coating tools can be cleaned with water, greatly reducing the consumption of cleaning solvent 4 The electrophoretic coating of water-based coating is even and flat The inner cavity, weld, edge and edge can be coated with a certain thickness of coating film, which has good protection; the coating film of electrophoretic coating has the best corrosion resistance, and the salt spray resistance of thick film cathodic electrophoretic coating can reach up to 1200h Existing problems: 1 The water-based coating has high requirements on the cleanliness of the construction process and the material surface Due to the large surface tension of water, the dirt is easy to cause shrinkage of the coating; 2 The dispersion stability of the water-based coating against strong mechanical forces is poor When the flow velocity in the transmission pipeline changes rapidly, the dispersed particles are compressed into solid particles, making the coating produce pockmarks It is required that the shape of the conveying pipe is good and the pipe wall is free of defects 3 The water-based coating is highly corrosive to the coating equipment, which requires anti-corrosion lining or stainless steel materials, and the equipment cost is high Stainless steel pipe is also required for corrosion and metal dissolution of water-based coating to transmission pipeline, which makes dispersed particles precipitate and coating produces pockmarks 4 The baking type water-based coating has strict requirements on the construction environment (temperature and humidity), which increases the input of temperature and humidity regulating equipment and energy consumption 5 The evaporation latent heat of water-based coating water is large, and the baking energy consumption is large The cathodic electrophoretic coating needs to be baked at 180 ℃, while the emulsion paint has a long drying time 6 The organic cosolvent with high boiling point of water-based coating produces a lot of oil smoke during baking, which drips on the surface of the coating after condensation and affects the appearance 7 The problem of poor water resistance exists in the water-based coating, which makes the stability of the coating and tank liquid poor and the water resistance of the coating film poor The medium of water-based coating is generally in the slightly alkaline (pH 7.5-ph 8.5) The ester bond in the resin is easy to hydrolyze and degrade the molecular chain, which affects the stability of the coating and bath solution, as well as the performance of the coating film Although there are many problems in water-based coatings, some problems are prevented in the process and some problems are improved and improved through the formulation, coating process and equipment Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,