What is the future development of coating technology for coating machines?

From the development of coating technology in recent years, there are three important characteristics of coating technology in the future:

1. It is worth mentioning that scraper coating is still the most important coating method for a long period of time, and it is developing towards high speed and high solid content;

2. The widespread use of measuring, gluing, pressing, and coating methods has developed rapidly;

3. New coating methods (spray coating and curtain coating) have attracted wide attention and will have a bright future.

But it doesn't mean that the development mentioned above will go smoothly, and there may be many technical difficulties and challenges to face. High solid content scraper coating can cause operational issues such as scraper marks, high scraper pressure, paint deposition on the scraper (commonly known as flipping), and fast scraper wear; Measurement, gluing, pressing, coating, and coating must face many challenges brought by high speed, high solid content, and high coating volume. Including spray at the outlet of the coating roller pressing area, orange peel paper disease on the coating surface, etc; The new coating method also needs to solve new problems that have not been encountered in conventional coating.

The progress of coating technology in coating machines

The development of coating technology in coating machines requires the matching of pigments, adhesives, and additives. At this time, the unique and important value of coating additives is highlighted. With the increase of solid content, the viscoelastic performance of coatings becomes increasingly important. The interaction between the components inside the coating leads to the structural changes of the wet coating, exhibiting distinct viscoelastic characteristics.

If the coating structure can be effectively broken under shear and quickly restored after measurement, it would be extremely beneficial. In this way, not only can it exhibit good workability, but also the migration of coating adhesive is reduced, and the coating coverage is good. However, at high solid content, the viscoelastic structure cannot be eliminated to an ideal level. The result is that there may be problems with scraper coating and metering glue pressing coating.

In spray coating and curtain coating, new coating additives are needed to obtain good workability. For example, a wetting agent needs to be added to the coating to spread the spray coating and stabilize the curtain of curtain coating. More importantly, spray coating requires low paint viscosity, and curtain coating requires appropriate paint stretch viscosity and other properties, which may also need suitable additives to cooperate.

In addition, coating additives have also shown a trend of multifunctional development. Rheological and water retention modifiers have some of the functions of lubricants.