What are the advantages and disadvantages of powder coatings compared with traditional coatings?

Generally speaking, powder coatings have the advantages of no solvent and zero volatile organic compounds. Due to pinhole problem, it is difficult to obtain ultra-thin coating (thickness less than 1.0).

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The exhaust gas discharged from the coating room can return to the coating room, which can reduce the frequent discoloration of the gas discharged from the oven.

Increase downtime

About 98% of the overspray powder can be recycled. The storage and handling of powder need special climate control.

Without drying or flashing time, the parts to be painted can be arranged more closely in color matching, and there is slightly less liquid in color tone.

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The uniformity of coating thickness suitable for continuous and automatic processes is sometimes difficult to maintain.

The coating does not sag, which can reduce the rejection rate. For temperature sensitive parts, the curing temperature of some powders is too high.

The training and supervision of construction personnel is minimal, so it is difficult to powder coat sharp corners.

Easy-to-obtain thick coatings are expensive to switch from liquid coating process to powder coating process.

The production capacity/output is highly adjustable. Due to the faraday cage shielding effect, the inner corner coating is very thin.

Simple cleaning and maintenance

1. Reduce environmental pollution

Energy saving

3. Excellent coating performance

4. Considerable economic benefits

1 Reduce environmental pollution

With the increasingly stringent requirements of environmental protection regulations on volatile organic compounds (VOC) content in the atmosphere, the coating industry seeks various methods to improve the coating technology to reduce environmental pollution. After long-term experiments and tests, it is finally found that "powder coating" is the most ideal coating technology that can be achieved at present.

Powder coatings do not use volatile solvents such as organic solvents and water, so powder coatings are inorganic solvent-based coatings, which greatly reduces the potential safety hazards caused by solvents, such as organic solvent poisoning incidents of operators caused by containing organic solvents; Or fire caused by organic solvents. Since the appearance of powder coatings in 1950s and 1960s, there have been no serious safety accidents caused by powder coatings.

Powder coating is 100% solid powder coating, which can be sprayed automatically. Excessive or overspray powder coatings can be recovered through the recovery system, so the utilization rate of powder coatings can almost reach 100%, which makes the coating industry reduce waste treatment and minimize environmental pollution.

Energy saving

Look at the energy costs of powder coatings and liquid coatings. Liquid coatings contain organic volatiles, which cause volatiles to volatilize into the atmosphere; Powder coating, on the other hand, will not be so wasteful, greatly reducing the use of energy.

The electrostatic coating machine has a large output, and a thick film can be obtained by one-time spraying without repeated spraying and priming. Under the condition of the same film thickness, the coating operation with powder coating is faster, which can save time and cost.

There is no need to set time in coating equipment, which can save equipment space. In addition, the baking time of powder coating is less than that of liquid coating, which can greatly reduce fuel energy, shorten coating production line, improve productivity and promote the overall production efficiency.

3. Excellent coating performance

As long as the powder coating is sprayed directly on iron or aluminum after proper pretreatment, excellent coating surface can be obtained after baking, such as the durability of the coating, including wear resistance, impact resistance, adhesion, toughness, corrosion resistance and chemical resistance. In addition to the above advantages, outdoor powder coatings also have high weatherability and pollution resistance. Especially for thick coatings, the powder coating can reach 50-300μm at a time, with good leveling property, and there will be no sagging and stagnant flow when the solvent coating is thick.

In order to improve the versatility of powder coatings, the color, luster and surface smoothness can be adjusted according to customers' preferences, even special metal powder coatings and some special wrinkle powder coatings.

4. Considerable economic benefits

Because the powder coating is sprayed by electrostatic principle, the coating equipment can be fully automated without wasting human resources. Even if manual assistance is needed, the painter can spray the film well without long-term training. Powder coating is 100% solid component, and no solvent is added, which saves packaging and reduces storage space. In the process of spraying, if there is a bad spraying part, you can blow it off with an air gun before baking, and then spray it on. Therefore, it is unlikely that the paint will hang on the surface, thus reducing the probability of repainting and rework. Among the components forming the coating film, the solvent-based coating accounts for about 60-65%, while the powder coating can almost reach 100%, and the powder not attached to the sprayed object can be recycled. Generally speaking, powder coating technology can improve production efficiency and economic benefits.