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Powder coating curing reactions can be divided into two types, one is the direct reaction without small molecule release type, such as the reaction of carboxyl groups with epoxy groups, and hydroxyl g......
2019-12-03(A) Benzoin easily decomposes under heating and causes yellowing of the coating film. Too much benzoin will cause discoloration of light-colored powder coatings. (B) As the thickness of the coating......
2019-12-03The powder coating is deposited on the workpiece in a loose structure after spraying. This loose structure causes a large amount of voids between the powder particles and the powder particles to be fi......
2019-12-03The essence of the Bernard vortex is the change in surface tension caused by the viscosity change during the melt-solidification of the powder coating, which causes the fluid with high viscosity and l......
2019-12-03The formation of pinholes in powder coating films is closely related to its unique melt-solidification process. Therefore, to study the formation mechanism of pinholes in powder coating films, the mel......
2019-12-03Pinholes, as a type of coating defect, are particularly noticeable in high-gloss powder coatings, and low-gloss powder coatings, especially matte sand-patterned powder coatings, are usually not notice......
2019-12-03Powder coatings and water-based coatings, light-curing coatings, and high-solids coatings are known as the four new environmentally friendly coatings. As an important branch of coatings, powder coatin......
2019-12-03Among the water-based resins used in water-based coating systems, water-based polyurethane resins, especially one-component water-based polyurethane resins, are very important ones and are widely used......
2019-12-02Because the molecular weight of the substrate wetting agent is relatively small, its silicone segment is very short, so it cannot give a good slip to the surface of the paint film (usually the slip co......
2019-12-02It can be seen from the above structure that the substrate wetting agent is actually a special type of polyether modified silicone oil, and its molecular weight is usually very small. Since the rapid ......
2019-12-02With the development of modern coatings and ink industry, the application speed of coatings and inks is getting faster and faster, so the requirements for fast wetting substrates are becoming higher a......
2019-12-02According to the accepted defoaming theory, a substance that can be used as a defoamer for a coating system usually needs to meet two points: one is to have a lower surface tension than the applicatio......
2019-12-02In the above structure, the silicone segment has 15 siloxane units, which are incompatible with the system and the surface tension is lower than the system; the polyether segment contains 8 hydrophili......
2019-12-02Generally, the structure of the leveling agent in coatings generally consists of two parts, the segments compatible with the system and the segments that are incompatible with the system and have a lo......
2019-12-02The most common silicone oil additive used in water-based coating systems is polyether-modified silicone oil, where the value of m and n determines the content of siloxane segments in the structure, a......
2019-12-02
