Electrostatic powder coating process

Electrostatic powder coating process

As we all know, electrostatic powder coating process since the birth of the 1960s, almost 100% for metal surface coating. While many have long powder manufacturers, equipment suppliers are claiming electrostatic powder coating can be applied to non-metallic surfaces, but can form industrial products, did not appear. Into the late 1990s, with the development of powder coatings and spraying equipment, electrostatic powder coating process applies to non-metallic surfaces become a possibility. Non-metallic materials for painting, Yudong high and the United Kingdom by way of the time in nearly two years, is committed to medium-density fiberboard (MDF) electrostatic powder coating, and has entered the industrial production a reality. This paper describes the present in terms of the latest situation sprayed MDF to promote the development of electrostatic powder coating technology.

1. Relevant factors electrostatic powder coating

Electrostatic powder coating is the powder coating is applied by electrostatic coating on another object, and the process of forming a coating baking temperature by a certain time. Factors involved in this process are another thing painted, powder coating, spray guns, baking equipment. These factors contribute to the analysis of the entire process understanding.

2. The coated object recognition

From an economic perspective, the object to be coated is sound given commodity. Except the metal, wood, plastic should be the choice of the column. Wherein the plastic due to the current stage temperature problem can not be considered temporary. For the timber is, MDF (medium density fiberboard) preferred. The reasons are: an electrostatic powder coating requires a conductive material, and wood is a hygroscopic material that will exchange moisture with the surrounding environment, after a certain period of time, it will absorb moisture in a particular environment at a certain temperature, thereby to reach equilibrium. Therefore, usually, the water content of manufactured goods Kimura will maintain an appropriate balance between the local climate. Can be considered by the adjustment of the moisture content of wood substrate, can become close to or equivalent to the conductor timber status. MDF is a wood products, also have these characteristics. Also MDF as environmentally friendly green building materials, a huge amount of its application, and increase in wood-based panels are also very fast. And MDF as a large-scale industrial production, and its products have also an important factor of stability and product quality process adjustability. It is these factors contributed to the choice we believe MDF powder coating.

3.Technological advances of Powder Coatings

Thermosetting powder coating for a long time, has been curing temperature (conventional curing temperature of 180 ℃, 20min) effects, making the process application range is limited. In recent years, more and more low temperature curing powder coatings are available. According to reports already 120 ℃ x20min curable powder can be prepared, of course, low temperature curing powder remaining in the storage stability of the poor, to some extent, restricted the scope of application. I believe that in the near future there will be improved. In the MDF plate spraying, use an ultraviolet-curable powder and ultra-low-temperature curing type. DSM has reportedly issued a maleic acid / vinyl ether-based UV-curable powder coating materials, the coating target for MDF. The company currently applied by way of the MDF (medium density fiberboard) is an epoxy / poly based mixed powder, the curing temperature is controlled within a maximum curing temperature is generally in the range of paint (150 ℃) inside.

4.Breakthrough of The electrostatic powder coating equipment

Corona charging gun experienced voltage charging, current charge, the total charge energy control (TEC) and several stages. The first two charging so spraying is limited to metal parts of the workpiece, and the use of TEC total energy control charging technology (TOTALENERGYCONTROL) broke through the above-mentioned limitations. Its technology is mainly that when the spray gun and the workpiece (access point) of the distance change, it could also automatically adjust the current and voltage to keep the total charge energy, effectively control the powder charge amount, to ensure the efficiency of the powder.

5. Powder Baking Equipment

For ultra-low temperature curing powder, through the use of special drying tunnel (high report mentioned in IR curing drying tunnel) to be cured and the elimination of volatile components under continuous high temperature MDF produced. That bake volatiles consumed internally, while ensuring stable process temperature curing temperature. This differs from the ultraviolet (UV) curing, UV curing is to use infrared light to make the powder melt flow level (100 ℃ or less), then a few seconds irradiation with ultraviolet light cured film.

Taking these points, electrostatic powder coating MDF (the ultra-low temperature curing) industrial production began in the late 1990s, in August 1999 the UK's first fully automated production line for MDF board successfully commissioned. Can be expected in the next two or three years, MDF powder technology will have a rapid development. Of course, the aspect of the MDF dusting process need to be improved in the future are: low temperature curing of coatings (including the further development and utilization of UV-curable powder); diverse variety of paint; TEC charging technology through the selection of a gun and the transformation of existing curing equipment, production lines so that both can be sprayed MDF sprayed metal products and so on. We also anticipate there will be other non-metallic products entering the field of electrostatic powder coating.

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Electrostatic powder coating process