Powder coating

1. Powder Coating

Powder coating technology was invented starting in the late 1940s and early 1950s. By Dr. Erwin Gemmer, a German scientist. This technology was patented in May 1953. With the advantage of outstanding color diversity, durability lasts for decades. This technology is increasingly developed and applied in all aspects of human life. Contributing to products with high durability, beautiful colors, comfort and safety with better electrical insulation and fire resistance than other paint technologies. With low production costs, people’s lives become more and more modern, safe and environmentally friendly.

2. Classification of powder coating

Today, according to technology there are two types of powder coating. Wet paint and dry paint have different advantages and disadvantages.

• Wet powder coating is a two component paint. Use liquid or gaseous solvents to mix to form a paint solution. The advantage is that it can be painted almost any surface on any different material. Colors can be mixed, varied, high accuracy. The construction process is mobile, flexible, and the investment costs are low. The disadvantage is that the excess solvent cannot be recovered, which affects the environment, the maintenance is longer, the paint failure rate is higher due to the paint surface having different thicknesses, depending on the skill of the painter.

• Dry powder coating uses dry powder coating with a positive charge (+), the surface to be painted has a negative charge (-). The paint surface is always uniform, with higher adhesion. Excess paint powder is recovered and reused, resulting in lower consumable costs. It does not require high skill in construction, construction and maintenance time is very fast. Greater durability and safety. Cons, only suitable for metal detail surface. Must invest in spray and drying system, difficult to maneuver, difficult to control the color of recovered paint powder.

Thus, depending on the material and the color scheme of the details to be painted. People will choose the paint plan to suit their production activities.

3. Common mistakes when powder coating

In order for the product surface to be of high quality and durable in all harsh environments and conditions. The powder coating process must meet strict requirements on equipment, technique, and paint quality. But sometimes products still experience unexpected surface defects. Let’s join Vietnam Industrial Surface Treatment Joint Stock Company to find out these errors and their causes. These errors usually appear due to the following reasons.

• Because the detailed surface to be treated has not met the requirements. The phenomenon of paint film peeling, perforation, uneven surface, smooth, wavy. Poor physico-mechanical strength, rust.
• Because improper preservation of raw materials, contamination, poor quality or inappropriateness. The phenomenon of paint film peeling, wrong color, uneven surface, poor mechanical strength.
• Because the technical level of the painter. The phenomenon of paint film is not uniform in thickness, edges are missed. Poor physico-mechanical strength, rust.
• Because the adjustment paint mode is not suitable. The phenomenon of paint surface blistering, foaming, uneven, grainy, wrong color. The paint surface thickness is uneven, the physico-chemical strength is poor.
• Because the equipment system being magnetized, contaminated or the quality of the equipment is not satisfactory. The phenomenon of the paint surface is not smooth with small dots, small holes, wrong color, poor physico-chemical strength.