1. Silane coupling agent is used in powder coatings for special substrates
The surface of some substrates such as galvanized sheets, aluminum sheets, glass, ceramics, polar plastics, etc. are often very smooth, and ordinary powder coatings are difficult to adhere. The silane coupling agent can react with the hydroxyl groups on the surface of these substrates to form chemical bonds, which can significantly improve adhesion of powder coatings.
2. Silane coupling agent is used for powder coatings with high water resistance requirements
Outdoor products such as construction aluminum profiles, aluminum alloy curtain wall panels, transportation facilities, outdoor furniture, etc. and indoor products that work in humid environments, such as washing machines, refrigerators and other household appliances and kitchen and bathroom products. The requirements for the water resistance and boiling resistance of the coating are becoming more and more stringent. Even powder coatings with good adhesion will foam after being soaked in warm water for 24 hours, and large pieces will fall off when pulled apart. At this time, silane coupling agents need to be used in the formulation to solve this problem.
3. Silane coupling agent is used for anticorrosive powder coating
Pipes, ships, and steel bars are in a humid and corrosive environment for a long time. Silane coupling agent can effectively improve the anti-corrosion performance of powder coatings: on the one hand, it can better combine the internal pigments, fillers and resins of the coating, and improve the corrosion resistance of the coating; on the other hand, it seals the interface between the coating and the substrate through coupling, prevents the migration and penetration of water molecules along the interface, and reduces the peeling and electrochemical corrosion of the coating by water molecules.
4. Silane coupling agent is used for insulating powder coating
The silane coupling agent can help to improve the electrical insulation of the coating, especially the electrical performance in the wet state. Related experiments show that the resistivity of the glass fiber epoxy laminate using silane coupling agent after being boiled in water for 72 hours is 1×10 times that of the blank control group.
5. Silane coupling agent is used for powder coatings using cheap resin
Silane coupling agents have a certain resin reinforcement effect, which can significantly improve the performance of low-priced resins in terms of adhesion, chemical resistance, and water resistance. Therefore, when you have to use some poor-quality resins in some products due to fierce market competition, you can add a little powder silane coupling agent to the formula to optimize the overall performance of the resin to obtain cost and quality balance.