Perhaps you’ve also heard the term “powder coating” and come into contact with them every day without even knowing it. Because nowadays, electrostatic paint is used quite commonly and appears everywhere around us, they are in everyday objects or devices. So what is powder coating? Where is the application? And what are the advantages? How are they different from regular paints, let’s find out!
1. What is electrostatic painting
?Powder coating technology is known in English as Electrostatic Powder Coating. It appeared in 1950 and was invented by TS.Erwin Gemmer after going through many researches.
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The history of powder coating goes back to the late 1940s and early 1950s, at a time when organic polymers were still sprayed in powder form onto metal sheets. Dr. Erwin Gemmer, a German scientist, later developed the fluidized bed process for treating thermoset powder coatings and patented the appropriate process in May 1953. From 1958 to 1965 , all types of powder coating generally have only functional applications with film thicknesses from 150 µm to 500 µm, treated by fluidized bed application. Coating materials in those days included nylon 11, CAB, polyethylene, flexible PVC, polyesters and chlorinated polyesters, thermoset epoxides, and more.
Powder coating is coated as a dry, heated powder, also known as a thermoplastic. Contrary to conventional paints that use water or solvents, electrostatic paint uses an electrostatic charge method for paint powder to create a stable bond with the parts to be coated. According to the principle that the current carrying a positive charge (+) will always be closely associated with a negative charge (-). That’s why electrostatic paint brings uniform quality and adheres firmly to the surface.
Powder coating is often used to create a hard finish and is especially hardier than conventional paints. So it is often used to coat metals, such as household appliances, aluminum profiles, in parts of cars, motorcycles and bicycles..
1.1 Composition of powder coating
Powder coating is a powder mixture produced from paint powder including raw materials: Organic polymer compounds (Organic Polymer), curatives, colorants, pigments and other additives. Then all will be mixed together and melted to form a homogeneous mixture, then cooled and ground into a fine powder, known as powder coating.
Currently on the market there are 04 popular types of powder coating: glossy (Gloss), matte (Matt), sand (Texture) and wrinkle (Wrinkle) they are used indoors and outdoors.
1.2 How to classify powder coating
– Classified according to the nature of 2 types:
Dry powder coating: use electrostatic powder to make paint for iron, steel, stainless steel Wet powder coating: Use solvent to make paint for wood, plastic, metal….
– Classification by function includes 5 types:
Polyester Paint Powder: this is the most common type of paint, has the advantage of high durability, resistant to sunlight. Epoxy Powder Paint: commonly used to resist impact, adhesion, erosion Acrylic Powder Paint: Commonly used Mainly used in clear paints, creating smooth surfaces and good chemical resistance Fluoropolymer powders: commonly used for outdoor paints Hybrid (Epoxy-Polyester) powders: low cost, easy to use. on many material surfaces.
2. Working principle of powder coating
Powder coating works on the principle of creating a coating on the surface of the material using a spray gun. Spray the charged coating on the surface of the material and then heat it. At this time, the paint powder will flow out and adhere to the surface layer of the material, creating a stable bond.
Equipment used in powder coating technology includes spray gun and automatic line system. In addition, to ensure the principle and process of electrostatic painting, businesses also need to invest in paint spray booths, paint recovery rooms, steam chambers, drying chambers, air compressors, dehumidifiers and chemical tanks. for surface treatment of materials before painting.
Principle of operation – Powder coating line
3. Advantages of powder coating
Economic: Powder coating brings high economic benefits. 99% paint is used thoroughly, residual paint powder in the process of spraying paint is recovered and reused thoroughly. No primer is required and easily cleans affected areas by spraying or by unsatisfactory spraying. The cost of products using electrostatic paint will be cheaper than conventional paints.
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In terms of usage characteristics: The coating process can be easily automated by using an automatic spray gun system). Easy to clean when the powder adheres to the body without using any solvents like for water-based paints, oil-based paints.
About quality: The finished product life of powder coating is high. Hard to be corroded by chemical agents, chemicals or weather.
Environmentally safe: Powder coating does not use solvents or organic compounds, so it will not harm the environment during construction. Waste can be disposed of in the landfill so it will not cause harm to the environment. Meanwhile, conventional paints contain toxic ingredients that can degrade ozone and create hazardous waste if not handled appropriately.
Durability: When cured, powder coating forms a much tougher protective layer than other paints. However, that doesn’t mean powder coating is the most durable solution on the market. Depending on the application, there will be alternatives that can provide a longer lasting coating.
4. Disadvantages of powder coating
Color change: As unused paint particles are collected and reused, there is a risk of mixing with each other. That makes color matching inaccurate.
System construction costs: Powder coating requires a spray gun and an air compressor power supply. In addition, it is also necessary to have a drying oven and a large power source to generate high voltage for the spray gun. The initial cost will be high.
In addition, workers must have a lot of experience and know the paint spraying process to be able to work in the system. Therefore, businesses need to spend more labor costs, labor training costs
5. Application of powder coating
Powder coating works mainly on the principle of electrostatics in modern physics. So it is suitable for metal materials and is often used in household and industrial equipment.
And especially, powder coating has a high application in the glass and aluminum door industry. Due to its colorfastness, it is difficult to fade by weather, and keeps the aesthetics of the building. Almost all types of aluminum currently available on the market in our country are suitable for this type of powder coating. Common types can be mentioned such as: 700 aluminum, 1000 aluminum, Viet Phap aluminum, Eurowindow aluminum, Xingfa red stamp.
Iron can also use this coating method, but iron has the disadvantage of being easily oxidized and corroded in the natural environment, even if it is a good paint. So the popularity of powder coating for iron is not as popular as aluminum. We can mention the applications of powder coating such as:
– Application in painting galvanized iron and steel shelves, galvanized fences, iron door frames, aluminum gates
– Application in automobile and motorcycle technology such as: chassis, bonnet, wheels, door handles, radiators, filters and many other details.
Application of powder coating in the automotive industry
– Application in home appliances: front and side of refrigerator, washing machine cover, air conditioner heater cover, dryer box, air conditioner, water heater, dish rack, microwave oven waves, ovens, metal hammocks… and many other household items.
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– Application in architecture, home decoration: powder coated door frames, doors, furniture, light poles, railings, signs, pillars and fences…
Applications in everyday products: there are countless everyday uses for powder coated products such as lighting fixtures, antennas and electrical components. Farmers have tractors and farm equipment that are powder coated. Fitness enthusiasts use golf clubs, snowmobiles, bicycles and exercise equipment, all of which are powder coated. Office workers use metal furniture, computer cabinets, mechanical pencils and pens, pins and other desk accessories that are powder coated. These items, and more, all benefit from a powder coated finish.