How is waterborne industrial paint coating process construction?

The decorative, protective and functional functions of the coating on the surface of the coated object are reflected by the film formed on the surface of the object. The process of forming the required coating film on the surface of the coated object is usually called coating structure, also known as coating. For waterborne industrial paint, construction is more important. Waterborne industrial paint serves as the commodity of market circulation, it is the semi-finished product of coating actually. Only through the formation of coating coating, can play its role, with use value.

The quality of coating directly affects the decorative effect and use value of the coated object, and the quality of coating depends on the quality of coating and coating. The performance of the coating is usually evaluated by the performance of the coating. High quality coatings cannot be obtained when inferior coatings or coating products are not up to standard. If used improperly and handled improperly, a high quality coating will not achieve an excellent coating and achieve the desired decorative or protective effect. The correct coating structure can fully reflect the performance of coating on coating, and the improvement of coating process can further improve the performance of coating.

Control the temperature and humidity in the process of waterborne industrial paint construction, the performance will be significantly improved. For waterborne industrial coatings, coating is the key to obtain high quality paint film and give full play to its role.

Front surface treatment:

The surface treatment of the substrate, also known as the surface treatment before painting, is the basic process of coating construction. The purpose is to create good conditions for the adhesion between the substrate and the film on the surface of the coating object, while improving and enhancing the performance of the film.

Steel surface often rust, oxide scale, oil and so on, oxide scale is steel in the process of hot rolling formed at high temperature oxide scale. Its expansion coefficient is smaller than that of steel. It tends to crack after a hot and cold cycle and peel off over time. In addition, it forms corrosive batteries in wet conditions. The oxide becomes the cathode and the steel becomes the anode. At this time, the oxide scale area is large and the steel area at the clearance is small, that is, the cathode is large and the anode is small, leading to the concentration of corrosion pits. The lower oxygen concentration under the loose oxidized skin and the higher oxygen concentration on the outside will create a differential oxygen concentration cell, so remove the oxide skin before painting.

From the point of view of polymer technology, coatings can not only produce polymer films, but also be good adhesives. Pure plastic film does not protect against metal corrosion. It is tightly bonded to the steel surface. The oil and rust on the steel surface will obviously affect the adhesion and protective properties of the coating, so the metal surface treatment should be removed rust and oil at the same time.

Surface treatment is a very important preparation process in order to obtain a good anticorrosive coating. It is generally believed that the reasons for shortening the life of the coating can be divided into: poor derusting quality accounted for 40%; Improper selection of coating system accounted for 20%; Coating thickness is not enough, accounting for 20%; Improper control of temperature, humidity and drying time interval during construction accounted for 20%.

Steel surface treatment methods can be divided into two categories: mechanical methods, such as sandblasting, cutting, etc., mainly used for steel thickness greater than 6mm, such as ships, port facilities, etc.; Chemical methods, such as oil removal, acid leaching, phosphating, passivation, etc. Phosphating and passivation are mainly used for cold rolled steel or aluminum, zinc, automobile, aircraft, household appliances and other non-ferrous metals.