Although the currently used electrostatic powder spraying equipment has many advantages such as safety and environmental protection, beautiful coating, excellent characteristics, and better coating quality, it still has the following problems to be solved:
(L) Selection of powder properties The current electrostatic powder used to produce high-quality coating depends on whether the powder has a positive electrostatic charge or a negative electrostatic charge. Generally speaking, a positively charged powder can produce smooth Coating, and the effect of negative charge is worse, powders with different properties will determine whether it can be positively or negatively charged. This aspect is still the place where manufacturers need to improve, hoping to break the restrictions on powder selection as soon as possible.
(2) Powder color modulation Because powder is not always different from solvent-based pigments, there are restrictions on the color modulation. Especially, it is difficult to make special colors such as gold and silver. Some paint manufacturers have problems in controlling the stability of the color, and often cannot maintain the same color for each batch of paint, which makes the coating of customers' products different in color. In fact, the quality of powders produced in Europe is stable and reaches international standards, and most powders do not contain toxic metal components, and this technology is lacking in domestic manufacturers, because without good formula, they do not contain heavy metal components. The powder is difficult to have a bright effect.
(3) The explosion hazard of powders and the toxicity of lead-containing mixtures. Powders are usually flammable and explosive, and form a potentially explosive mixture within certain well-defined density limits of the powder and air mixture. In addition, although most powder coatings are non-toxic, some powder coatings contain lead mixtures, which poses a certain threat to human health and safety, because powder coatings contain toxic elements and lead in dry films. The ingredients of the mixture will migrate out of contact with human skin. If the lead content of the powder mixture in the powder coating exceeds 5% of the weight of the mixture itself, the powder coating cannot be used for coating food containers and children's chewing or sucking articles. These are issues that manufacturers must pay attention to when selecting or replacing powders.
(4) The life of powder coatings Currently, powder coatings can only last for 10 years. With the increasing market demand, research steps on how to extend the life of powder coatings need to be continuously accelerated.
In summary, with the rapid development of modern coating technology, powder coating, as a simple, clean, and economical technology, has its own advantages. In the automotive air-conditioning industry, a new round of product upgrades and accompanying In the coming technological transformation, it will be more and more widely used.