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GLASS COATING AND DECORATION

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GLASS COATING AND DECORATION

Working under the motto «we paint everything», it is clear that we could not pass glass painting in our studies.

Glass possesses a number of unique properties, especially the ability to create different optical effects. It has always been a subject of expert’s interest in the field of construction, interior decoration, furniture, etc. Glass painting relates to technology, «treatment», which solves problems of artistic and decorative properties of products. It allows you to create a broad palette of different colors, which makes glass as a decorative material even more attractive.

Everyone knows (see Section «Powder coating») the benefits and advantages of polymer powder coatings technology.

Therefore, special attention is now paid for the coloring of glass by thermoset powder paints. Leading developers of paints made numerous studies of this technology. And, despite some progress, gaps in quality of painting have become an occasion for serious and well-founded criticism. With the development and introduction of new modified thermoplastic paints a notable progress in improving of glass coating methods has appeared. However, in view of urgent need of solving this problem, it is obvious that significant technological breakthrough in application of powder coatings for glass is predicted in the near future.

We believe that first of all it will be connected with thermoplastic paints. The basis for this assertion is our hands-on experience with thermoplastic paints of PLASCOAT (RRA series 571ES, RRA 524ES, WITROGUARD 12ES).

We found that when glass is coated by PLASCOAT paints, finished products acquired a new property – protection. Nature of destruction of this glass is similar with Triplex. Powder coating additionally acts as a protective film. We have received samples of color «painted» triplex. Polymeric powder layer was used instead of classic laminating film. The results indicate the prospects of this direction and require further theoretical and practical development.

Now let’s review the alternative methods of glass painting with liquid coating materials (LCM).

There are several groups of LCM. First is paint (enamel based on ceramides) with firing in oven at high temperatures, the second is a group of acrylic and polyurethane materials for air drying. They can be either water soluble or dilatable by organic solvents.

In our work at glass painting, we use a two-component polyurethane-acrylic production of «Palin Coatings Ltd». All process maps were presented by «Plast Style» (Kiev). Analysis of results of practical application showed that the materials offer good mechanical and chemical resistance, adhesion, have a large range of colors, they can be tinting on RAL system. There are also a good group of special effects and relatively low cost of painting process. We perform continuous surface painting, and use art stencils that allow us to get full-color drawings of any complexity.

We have developed and tested a method of high-performance drying of these materials in the infrared ovens.

The approach is in the following: the process of glass heating is divided into two phases:

  1. Drying.
  2. Heat treatment.

Drying is removal of moisture.

Heat treatment is heating of material to activate chemical reactions.

Due to differences in the physical nature of tasks, phased programmed mode is used in which power and spectral composition of radiant flux control is performed. At the same time, we get the perfect quality surface with good adhesion. The full cycle of heat exposure is 20-25 minutes. The photos are examples of continuous and fragmentary painting. We have done coating of facade and interior glazing of «Shakhtar» hotel Donetsk.

In addition to simple glass painting, interest to create large-scale full-color images on glass and mirror surfaces is constantly growing. Existing methods for applying high quality pictures have drawbacks, and in view of complexity of instruments they are used quite rarely. So one of the persecuted goals is to show the possibility of solving such tasks by simpler methods and means, which are based on principle of sublimation thermal transfer (see. section «Polymeric decoration»).

A combined image forming method which does not require restrictions on size and configuration was developed. It enables to form an image on the mirror surface, with a transparent or opaque background.

The photo shows samples of painting and decorating of glass and mirrors.

The practical side of developed method involves an in-depth study of image formation mechanism and development and optimization of equipment parameters. We are ready to provide proposal for sublimation equipment for glass decoration.