Powder coating around us

Powder coating additives must be stable in powder coatings for a long period of time in order to achieve their proper performance. Therefore, the commonly used additives should have good compatibility with epoxy, polyester, acrylic and other resins. Then the compatibility of furniture powder coating additives and resins is usually compared, and the method used is based on their structural similarity. For example, the use of leveling agents can be divided into one type is physical, and the other is carrier-free.

Carriers with E-12 as carriers cannot be used in the formulation of pure polyester systems. Furthermore, the commonly used B68 type chemical matting agent is only suitable for systems with epoxy, and for other systems, which not only loses its due effect, but also brings negative effects to the coating film.

1. Control the particle size distribution of the powder, the narrower the better:

Reasonably controlling the particle size of the powder (difficult to control), in our actual production, we only have to adjust the speed of the ACM main and auxiliary mills. It is important that the particle size of the powder is 40-50UM, and the narrower the distribution, the better.

Second, increase the resin content:

Increase the amount of resin and reduce the amount of filler. Use a resin with good charging performance. Epoxy is better for powdering. Some manufacturers do not powder polyester, and some manufacturers have difficulty in powdering the polyester (epoxy and polyester are ground separately. Powder spray plate), the leveling of the friction spray gun is significantly better than that of the electrostatic gun, and the friction gun can spray a thicker coating, the coating does not have the disadvantages of high-pressure guns such as blooming orange peel.

3. Reasonable selection of fillers:

Filler fineness and dispersion are closely related to powdering. The powder on the precipitate is higher than the general ultra-fine heavy barium, and the barium sulfate is better than the calcium carbonate.

Fourth, increase charging assistant:

Add an appropriate amount of conductive additive to the formula (Mechanism of action: make the powder particles more charged. There is a strong electric field in the area from the high-voltage electrostatic spray gun to the workpiece, and the air is ionized to generate hundreds of millions of ions. The powder particles of the electric agent are polarized when passing through this area, and they can capture more negative ions and carry more electric charges. For the dead corner of the groove and other parts, the power line is weak due to the Faraday effect. The powder particles can reach the surface of the workpiece by their own power, thereby improving the powder coating on these parts.

Analyze the main composition and performance characteristics of powder coatings: what are the main types of electrostatic powders, including resins, pigments, curing agents, auxiliaries, etc. electrostatic wind powder coatings are divided into two categories, namely thermosetting coatings and thermoplastics Coatings, thermosetting coatings refer to thermosetting resins as film-forming materials, and infusible hard coatings are added; thermoplastic coatings are simple to process and spray. Thermoplastic coatings need only be heated to melt, level, cool or extract to solidify into a film. That is, no complicated curing device is needed, and the coating is non-toxic, non-toxic, and solvent-free, so no problems such as poisoning, fire, and waste generation occur, which fully meets the requirements of national environmental protection laws.

Electrostatic spraying powder can save energy. Because powder coatings have no volatilization of organic substances, waste is avoided, and the term electrostatic spraying powder spraying can get a thick film without the need for a primer; use electrostatic spraying The powder has significant economic benefits, high coating utilization efficiency, and automation, saving human resources, high coating utilization, and no need to use organic solvents, which also reduces environmental pollution.