Characteristics of coating equipment and common problems of coating equipment
The following are the characteristics of powder coating equipment, safe use methods, and the reasons and treatment methods for the loss of light in the spraying of coating equipment.
Features of coating equipment
(1) Coating equipment is inseparable from solvents and many parts must be resistant to solvents.
(2) The paint is inflammable and explosive, and many parts of the equipment should be treated with flame retardant and explosion-proof.
(3) The coating process requirements are relatively fine, and the equipment precision requirements are relatively high
(4) The equipment load is low, and there are few heavy equipment.
(5) It is easier for the coating equipment to plan the production method of the assembly line and save labor.
(6) The running speed is relatively slow
Safe use of coating equipment
(1) Equipment operators must be proficient in the structure, performance, operation, and maintenance methods of various machinery, so that they can be used and responsible by special personnel.
(2) When operating woodworking machinery, work clothes should be worn, and the cuffs should be fastened. Lesbians must wear work caps, and the braids should be placed in the cap; gloves, scarves, etc. are not allowed to operate.
(3) The machine must be tested before starting to work, and the work can be started only after all parts are running normally.
(4) Shafts, chains, pulleys, belts and other running parts on the equipment should be equipped with protective covers and protective plates.
(5) If there is any abnormal situation or other failures in the mechanical operation, the power supply should be cut off immediately and the machine should be stopped for maintenance.
(6) Most of the surrounding equipment is inflammable, and fireworks should be strictly prohibited.
(7) When debugging and maintaining equipment, the main power supply must be cut off.
Causes and treatment methods of foaming in the spraying of coating equipment:
reason:
1. The surface of the coated object is wet or contains acid, salt, salty and other substances.
2. The paint and thinner are mixed with water.
3. The surface of the coated object is too rough, the absorption of the coating is large, and the coating is too thin.
4. The humidity of the site environment is high, more than 90%, and the coating is very easy to whiten and lose its luster.
5. The site temperature is too low, the drying is too slow, and the water gathers on the surface layer to cause loss of light.
6. The water in the air compressor is not cleaned cleanly, and it is mixed into the coating to cause lesions.
7. The amount of diluent is too much.
Solution:
1. Clean up the impurities on the surface of the coated object.
2. Take good care of the paint and prevent it from being mixed with water.
3. Pay attention to the thickness of the sandpaper to ensure that the coated object is flat.
4. Adjust the indoor temperature or stop construction.
5. The construction environment temperature is generally above 10 degrees.
6. Remove the water in the air compressor gas and maintain the oil-water separator.
7. Adjust the construction ratio.
What miracles can the new technology of energy-saving surface coating equipment bring?
The optimization of the minimum film-forming temperature (MFT) and glass transition temperature (Tg) of the latex is special for the film-forming process of autophoresis emulsions. At room temperature, the autophoresis deposition coating film is only the result of the mutual cohesion of spherical colloidal particles, and there are countless voids between the colloidal particles. After a certain temperature (ie MFT), the colloidal particles and the colloidal particles are fused and finally cured to form a film. Therefore, the MFT of the autophoresis emulsion is an important parameter. If the MFT is too high, the colloidal particles cannot be fully fused, and the formed coating will produce pinholes, and its corrosion resistance must be poor; if the MFT is too low, although the colloidal particles have good fusion, it is easy to obtain defect-free However, since the MFT of the latex is reduced at the expense of its relative molecular mass, the glass transition temperature Tg of the latex is lowered, and the corrosion resistance of the coating film is usually reduced. In order to solve this contradiction, the use of emulsion gradient polymerization technology is an effective way, that is, in different stages of emulsion polymerization, monomers with different properties are used, so that the colloidal particles have a core-shell structure with different properties, and the shell layer has a lower MFT, and the gel core has a higher Tg, forming a "soft shell and hard core" structure. In this way, the lower MFT shell layer is conducive to the fusion of the gel particles, and the higher Tg gel core makes the coating body have a higher The relative molecular mass of the coating improves the corrosion resistance of the coating. In addition, the control of emulsion particle size and autophoresis activity is also very important. To sum up, the key technology of autophoresis powder coating is concentrated in the autophoresis polymerization process.
Compared with electrophoretic coating, the process of self-swimming coating is relatively simple, and the pre-treatment does not require surface adjustment and phosphating treatment, and the auto-swimming fluid does not require ultrafiltration. The process flow is as follows: Pre-degreasing ——Washing——degreasing——water washing——deionized water washing——autophoretic deposition——water washing——post-treatment——drying Control at 5 ~ 10min. If there is rust on the surface of the workpiece, it must be derusted
