Coating knowledge: characteristics of water-based coating and requirements for spraying construction

Core tip: with the increasingly strict implementation of environmental protection standards, waterborne coatings as environmental protection coatings have been widely used and developed For example, all of our internal and external wall coatings, metal paint, automotive paint and so on have corresponding waterborne coating products As a relatively new type of coating in the current coating market, many people do not have a correct understanding of it We should know more about the characteristics of water-based coating and spraying construction requirements, so as to better use it in daily life 1 Brief introduction of water-based coatings Coatings with water as solvent or dispersion medium can be called water-based coatings Water based coatings include water-soluble coatings, water diluted coatings and water dispersibility Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Home of coatings: with the increasingly strict implementation of environmental protection standards, waterborne coatings as environmental protection coatings have been widely used and developed For example, all of our interior and exterior wall coatings, metal coatings, automobile coatings, etc have corresponding water-based coating products As a relatively new type of coating in the current coating market, many people do not have a correct understanding of it We should know more about the characteristics of water-based coating and spraying construction requirements, so as to better use it in daily life 1 Brief introduction of water-based coatings Coatings with water as solvent or dispersion medium can be called water-based coatings The water-based coating includes water-soluble coating, water diluting coating and water dispersing coating (emulsion coating) The water-soluble coating is based on water-soluble resin as film-forming material, polyvinyl alcohol and its various modifiers as representatives, in addition to water-soluble alkyd resin, water-soluble epoxy resin and inorganic high polymer water-based resin 2 The characteristics of water-based coatings the water is used as the solvent in the production, manufacture and application of water-based coatings, and the equipment used can be cleaned with water; the solid content is increased, and the price is reduced; the dispersion of pigment in water-based coatings is worse than that of solvent type, which will affect its weather resistance; The surface tension of the coating is higher than that of the solvent based coating, and the wettability and distribution of the surface of the workpiece are poor The coating is prone to pinholes, shrinkage holes, bubbles and sags; the water evaporation of the water-based coating is slower than that of the solvent based coating, and the flashing time is long or low temperature baking is required For water-based coatings with high water content, it is necessary to dry them and heat them up in sections at a temperature lower than 100 ℃ until the water is basically removed before baking; the shear force has an impact on the stability of water-based coatings, and different viscosity and flow rate appear with different shear force in the circulation system Water based paint is a relatively new type of paint in the current paint market Compared with solvent based paint, the details are as follows: 2.1 advantages of water-based paint (1) water-based paint uses water as solvent, saving a lot of resources; water-based paint eliminates the risk of fire during construction; reduces air pollution; Only a small amount of low toxic alcohol ether organic solvent was used in the water-based coating, which improved 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 directly applied on wet surface and humid environment; the water-based coating has good adaptability to 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, which has good protection; the electrophoresis coating has the best corrosion resistance, and the salt spray resistance of the thick film cathodic electrophoresis coating can reach up to 1200h 2.2 existing problems of water-based coating (1) the water-based coating has high requirements on the cleanliness of the construction process and the material surface Due to the high surface tension of water, dirt is easy to cause shrinkage of the coating (2) The dispersion stability of water-based coating against strong mechanical force is poor When the velocity in the 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 has great corrosiveness to the coating equipment, so it needs to use anticorrosive lining or stainless steel material, so 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 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,