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nature : for coated with the material (mostly organic polymer), the appearance was in liquid form or powder form. Different Coating Process objects to the surface coating, which can be a tenacious continuous film. Attached to the surface objects, protective and decorative effect or special functions (such as insulation, corrosion, etc.) role. Its components include film-forming materials, pigments, solvents and additives four parts. Film coating material is the main material, in accordance with its coating properties can be divided into organic and inorganic coating paint two categories. Previous coating is mainly used vegetable oil and natural resin preparation, and it called the "paint" Paint now mostly synthetic resin is used to prepare, called "paint" more appropriate. Concrete Coatings in the name of the phrase "paint" said "Paint." Blending such as paint, as thick paint. Paint objects in uniform coating surface coating by light absorption, reflection and scattering effects, etc., color substrate covered. Determination of three ways : (a) the quality of unit area, covered in the unit area with the smallest amount of paint used g/m2 said; (2) the minimum film thickness, covered live bottom of the required minimum wet film thickness, said with μ m; (3) Anti - radio rate contrast, the law applied mainly to white and light-colored paint, paint a different coating thickness in a transparent polyester film, drying after placing black and white glass plate, using reflectance measured reflectivity, the ratio reached CR, CR = RB / Rw, RB on the blackboard for the reflectivity, Rw whiteboard for the reflectivity, the ratio is 0.98, that is all that is covered, according to the film thickness can be reached hiding. The same quality paint products, construction in the same conditions, hiding high product comparable hiding low coating products more of the area. Impact paint hiding the main factors used paint, coatings and pigments Yanji than the decentralized level. Of these, the selection of suitable pigments, pigment dispersion of the good and bad decisions of hiding coating, the better the extent of spread, the better hiding.
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