![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
Water-based paint is currently more environmentally friendly than a material, but it is also a relatively new type of moisture-proof paint, this product is water-based solvent or dispersion medium coating, at present, is still very popular with consumers. The following Xiao Bian will introduce to you the standard of water paint performance test and what problems exist in water paint.
What are the standards for water paint performance testing
Water-based coating performance testing standards are mainly viscosity, fineness, hiding power, adhesion, water resistance, dry rub resistance, scrub resistance, etc., and requirements for harmful substances in paints. There is no exposure standard test method, if we must follow the standard to refer to the following standards: GBT 1766-2008 paint and varnish coating aging rating method; GBT 1865-2009 paint and varnish, artificial weathering and artificial radiation exposure, Filtered xenon arc radiation.
What are the problems with waterborne coatings
1, water-based paint on the construction process and the surface cleanliness of the material requirements are relatively high, because the surface tension of water is large, if you do not clean the surface of the dirt will make the coating film shrinkage;
2. Water-based paints have poor dispersion stability against strong mechanical forces. When the flow rate in the conveying pipe changes rapidly, you can find that the dispersed particles are compressed into solid particles. At this time, it may cause the coating film to generate pitting. Requires a good shape of the conveying pipe, then it is to protect the pipe wall without defects.
3, water-based paint on the corrosion of coating equipment, so the use of anti-corrosion lining or stainless steel material should be used, relatively speaking, its equipment will be relatively high cost. The corrosion of the waterborne coating on the conveying pipe and the dissolution of the metal allow the dispersed particles to be precipitated and the coating film to generate pitting. Stainless steel pipes are also required.
4. Baking-type water-based paints have strict requirements for construction environmental conditions (temperature, humidity). At the same time, they also increase the investment in temperature-regulating and humidity-control equipment and also increase energy consumption.
5. The latent heat of evaporation of the aqueous coating water is large, and then your baking energy will also be consumed. Cathodic electrophoretic coatings need to be baked at 180°C; latex paints will dry completely longer.
6. The organic co-solvents with high boiling point of water-based paints produce a lot of fumes during baking. If it is waited for it to dripping on the surface of the coating after condensation, it will also affect the appearance.
7. The water-based paint has the problem of poor water resistance. This will make the stability of the coating and the bath poor, and the water resistance of the coating is poor. Waterborne paint media are generally slightly alkaline (ph7.5 ~ ph8.5), the ester bond in the resin is easily hydrolyzed to degrade the molecular chain, so that the price will greatly affect the stability of coatings and baths, and the performance of the coating film .
Summary: What are the criteria for waterborne paint performance testing and what are the problems with waterborne coatings? The relevant content is introduced here. Although there are many people using waterborne paint, there are still some problems when using it, so we must understand it in advance. Clearly.
Hexagonal Chicken Wire Mesh,Chicken Wire Cage Grid,Hexagonal Wire Mesh,Galvanized Welded Wire Mesh
Anping Xinlong Wire Mesh Manufacture Co.,Ltd. , https://www.xinlongfence.com