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Analysis of the advantages of powder coatings compared with traditional coatings
1. Reduce environmental pollution With environmental protection laws and regulations on the content of volatile organic compounds (VOC) in the atmosphere becoming more and more stringent, the coating industry seeks various ways to improve coating technology to reduce environmental pollution. After long-term experiments and tests, it was finally found that powder coating is the most ideal coating technology that can be achieved. The powder coating does not use organic solvents, water and other volatile solvents, so the powder coating is an inorganic solvent-based coating, which greatly reduces the safety hazards caused by the solvent, such as the organic solvent poisoning of the operator caused by the organic solvent; or Fire caused by organic solvents, etc. Since the introduction of powder coatings in the 1950s and 1960s, there has not been a major safety accident caused by powder coatings. Powder coating is a 100% solid powder coating, which can be sprayed fully automatically. Excessive or oversprayed powder coatings can be recycled and reused through the recycling system device. Therefore, powder coatings can reach almost 100% utilization rate, which enables the coating industry to reduce waste disposal and reduce environmental pollution to lowest. 2. Save energy Looking at the energy costs of powder coatings and liquid coatings. Liquid coatings contain organic volatiles, causing volatiles to evaporate into the atmosphere; while powder coatings do not have such waste, which greatly reduces energy usage The electrostatic coating machine has a large discharge volume and a thick film can be obtained by one spray. There is no need to repeat spraying or primer. In the case of the same film thickness, the coating operation using powder coatings is faster, which can save time and cost. No setting time is required in the painting equipment, which can save equipment space. In addition, the baking time of powder coating is also less than that of liquid coating. This can greatly reduce fuel energy, shorten coating lines, increase productivity, and promote overall production efficiency. 3. Excellent film performance As long as the powder coating is directly sprayed on the substrate with suitable pretreatment, the surface of the coating film with excellent performance can be obtained by baking, such as the durability of the coating film, including: abrasion resistance, impact resistance, adhesion, Toughness, corrosion resistance and chemical resistance etc. In addition to the above-mentioned advantages, outdoor powder coatings also include high weather resistance and pollution resistance. Especially for thicker coatings, the powder coating can reach 50-300μm in one spray, and has good leveling properties, which will not cause dripping or stagnation when thickly coated with solvent coatings. In order to enhance the multi-functionality of powder coatings, the color, gloss and surface flatness can be adjusted according to customer preferences, even special metal powder coatings and some special wrinkle powder coatings. 4 Considerable economic benefits Because powder coatings are sprayed using electrostatic principles, the coating equipment can be fully automated without wasting human resources. Even if manual assistance is required, painters can spray a good film without long-term training. The powder coating is 100% solid content and does not need to add any solvent, saving packaging and reducing storage space. In the spraying process, if there is a poorly sprayed part, it can be blown off with an air spray gun before baking, and then sprayed on. Therefore, it is unlikely that the surface flow and dripping will occur, thereby reducing the probability of repainting and rework. In the composition of the coating film, solvent-based coatings are about 60-65%, while powder coatings can reach almost 100%, and the powder that is not attached to the object to be sprayed can be recycled and reused. Generally speaking, the use of powder coating technology can improve production efficiency and economic efficiency. (Transfer from Paint Online)
Purchase skills and precautions for powder coatings
Purchase skills and precautions for powder coatings Powder coatings are generally composed of synthetic resins, curing agents, pigments, fillers and additives. Therefore, it is very important to choose these raw materials, because the proper selection of each raw material has a great impact on the performance of the coating and coating film. 1. Selection of synthetic resin The structure and performance of synthetic resin are the main factors that determine the performance of powder coatings and coating films. Therefore, we must handle the selection of synthetic resin. The structure of the thermosetting powder resin must contain active functional groups, so that a network-like structure can be formed during the baking process. In the application process of powder coating, if the decomposition temperature of the resin is very close to the melting temperature, it is very difficult to control the heating temperature. Therefore, the temperature difference between the melting temperature and the decomposition temperature of the resin is required to be large. 2. Selection of curing agent The curing agent largely dominates the performance of thermosetting powder coatings and coating films, and it is an important measure for resin modification. Therefore, it is very important to choose the right curing agent. It is solid at room temperature, that is, powder, granule or flake. It has the characteristics of latent curing agent. That is to say, different resins or other components undergo chemical reactions during production or storage, and they do not agglomerate and agglomerate. 3. The choice of pigments and fillers. 4. The choice of additives. Precautions: 1. Keep away from fire, avoid direct sunlight, and place in a well-ventilated place with a temperature below 35°C. 2. Avoid storing in places susceptible to water, organic solvents, oils and other materials. 3. Safety of painting construction site 4. All equipment used in painting operations must be well grounded to eliminate static electricity.
One of the important additives of powder coating leveling agent
Leveling agent is one of the most important additives in powder coatings. In powder coating formulations, when a smooth and smooth film appearance is required, whether it is a high-gloss, glossy, semi-gloss, matte or matte powder coating, a leveling agent must be added. The function of the leveling agent is to form a very thin monomolecular layer on the surface of the molten paint when the powder coating is melted and leveled to provide uniform surface tension and at the same time to provide good wetting between the powder coating and the coated object (workpiece) It can overcome the disadvantages of pinholes and shrinkage holes formed on the surface of the coating film due to uneven local surface tension. In addition, the leveling agent is beneficial to improve the leveling of the coating film, reduce the orange streak of the coating film, facilitate the dispersion of pigments and fillers, and facilitate degassing during film formation. The main components of leveling agents are acrylate homopolymers and copolymers, silicone modified acrylate polymers, polysiloxanes, hydrogenated castor oil and butyral, etc., and the addition amount is 0.5-1.5 of the total formula %, it can eliminate shrinkage holes and improve the gloss of the coating film.
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