Electrophoretic Coating Equipment Reflect Metal Texture And Overcome Traditional Painting Problems

Feature:

The water-soluble coatings used in electrophoretic coating have high environmental protection. Its specific performance is: the use of water-soluble paint in electrophoretic coating, more than 80% of the paint is water, solvent volatilization is little, and the pollution to the environment is correspondingly reduced. Electrophoretic coating mainly uses acrylic resin or epoxy resin (lead-free), which is not particularly toxic to the human body. The paint taken out during the electrophoretic coating process can be recycled 100%. Therefore, electrophoretic coating is one of the most promising processes in the future development of coating. Five specific features:
1, electrophoretic coating as a coating layer directly applied to the metal surface, its coating rust resistance and binding force can not be achieved by other coating.
2. Electrophoretic coating can be used as a coating treatment process with one bottom surface, which can ensure the requirements of coating in terms of performance and appearance. It can also simplify the painting equipment and reduce the production cost.
3, greatly reduce the use of coating solvents, and reduce paint dust and paint waste, conducive to environmental protection and reduce the secondary pollution of paint waste.
4, in terms of film performance, it can improve the smoothness and bonding force of the coating, reflect the metal texture, and overcome the problems of traditional painting, such as flow hanging and poor coating uniformity.
5, electrophoretic coatings can be recycled through ultrafiltration or reverse osmosis devices to bring out the paint, to achieve the recycling of resources, thereby reducing waste.

Care and maintenance:

Maintenance of the electrophoresis main tank circulation system In order to ensure the smooth circulation of the electrophoresis main tank, it is necessary to pay attention to the usual maintenance and maintenance:
(1) The minimum circulation must be guaranteed: 4 times the amount of liquid in the tank /hr, and insufficient circulation may cause deposition at the bottom of the tank and deposition on the surface of the workpiece.
(2) The minimum surface flow rate must be guaranteed: low surface flow rate may cause deposition on the surface of the workpiece.
(3) The liquid level difference between the main and secondary tanks must be ensured.
(4) It must be ensured that there is no spraying dead Angle at the bottom of the tank: the falling off of the glass steel lining of the tank body may cause repeated deposition of the coating, corrosion of the tank wall, and leakage of electricity to threaten personal safety.
(5) Proper filtration accuracy must be ensured: good filtration is an important measure to ensure that the film is free of particles.
(6) It is necessary to ensure a good temperature-controlled heat transfer system: circulation and electrophoretic heat transfer, and control of the bath temperature is essential. Electrophoresis tank liquid in the production process requires constant temperature, so the circulating tank liquid must have a heat exchange system and sufficient heat exchange capacity heat exchange medium temperature requirements: cooling or heating: 5 ~ 15℃. It is recommended to control the temperature of the tank during the long shutdown period: 20 ~ 25℃
(7) It is necessary to filter the recovery of accumulated paint when the tank is poured, which can greatly improve the utilization rate of electrophoretic paint. The electrophoretic process is divided into anode electrophoresis and cathode electrophoresis. If the coating particles are negatively charged and the workpiece is the anode, the coating particles in the electrophoretic process are deposited into a film on the workpiece under the action of electric field force. Electrophoretic process If the paint particles are positively charged, the workpiece is the cathode, and the coating particles deposited on the workpiece by the electrophoretic process are called cathodic electrophoresis. The anodic electrophoresis has lower technical requirements, and the corrosion resistance of the coating is worse than that of the cathodic electrophoresis.
The main components of cathodic and anodic electrophoretic coatings are as follows:

Cathodic electrophoretic coating
• Resin: It is the key ingredient, commonly used epoxy resin, acrylic resin, polyurethane resin, etc. Epoxy resin provides good adhesion and corrosion resistance; The acrylic resin can give the coating good light preservation and weather resistance. Polyurethane resin gives the coating excellent wear resistance and flexibility.
• Pigments: inorganic and organic pigments. Inorganic pigments such as titanium dioxide, carbon black, etc., can provide hiding power and color; Organic pigments have bright color, strong coloring power, and can meet decorative needs.

• Solvent: mainly water and a small amount of organic solvent. Water as the main solvent makes the paint have good water solubility and stability; Organic solvent can adjust the fluidity and drying speed of the paint.
• Additives: including defoamer, leveling agent, neutralizer, light stabilizer, etc. Defoamer can eliminate foam; The leveling agent makes the coating surface smooth and smooth; The neutralizer is used to adjust the pH value of the paint; The light stabilizer improves the photoaging resistance of the coating.

Anodic electrophoretic coating
• Resin: Generally anionic resin containing carboxyl and other acidic groups, such as acrylic resin, epoxy resin, etc. By neutralizing with alkali to form water-soluble salt, the resin can dissolve and disperse in water.
• Neutralizer: commonly used ammonia, organic amines, etc., react with the acid groups in the resin to form water-soluble salts, so that the resin can be dissolved in water to ensure the water solubility of the paint.
• Hardener: such as melamine resin, which can cross-link with specific functional groups of the resin to cure the coating during baking, improving the hardness, water resistance and corrosion resistance of the coating.
Solvent: Similar to cathodic electrophoretic coatings, water is the main solvent, and a small amount of organic solvent is added to help dissolve, adjust viscosity and improve the performance of the film.
• Additives: levelling agents, antioxidants, etc. The leveling agent improves the leveling property of the coating. Antioxidants prevent paint from oxidizing and deteriorating during storage and use.