Finishings such as polyester varnishes are often used in the furniture and industrial sectors. The product line includes glossy and matt finishes suitable for coating metal and wood substrates. In addition to coatings, polyester primers are actively sold on the market, which are indispensable for closed-pore finishing.
Properties of polyester-based coatings
This kind of funds are characterized by increased performance. A product covered with such a varnish looks brighter in appearance, and the surface acquires a shine similar to a wet effect. With the option of using a pigmented varnish, the surface acquires distinctive decorative properties.
In terms of their composition, polyester compositions are paraffin-containing and paraffin-free, each of which differs in its specific details of operation.
A distinctive feature of polyester varnishes lies in their properties, namely:
- fits well on wooden base;
- cope with minor imperfections: mechanical defects, chips or dents, grooves resulting fromgrinding;
- formation of an even and smooth glossy coating, which, if necessary, after drying, polished in order to remove the upper paraffin layer.
Features and benefits of using polyester coatings
Among the distinctive characteristics of the polyester compound for wood:
- possibility of using the top coat as a base (preparatory coat);
- distinctive decorative properties (glossy surface);
- special matte texture, to achieve which special components are used that are added to the composition of polyester varnish;
- possibility of pigmenting the varnish to achieve a beautiful clean tone of the coating;
- varnish shrinkage does not occur over time;
- for external work is not a very good option, as it is unstable to changes in the atmospheric environment.
Features of paraffin-containing formulations
Polyester varnishes for wood, the component composition of which includes unsaturated resins dissolved in styrene. In addition, it contains catalysts (initiators) and accelerators (accelerators) of the polymerization process. Due to the content of paraffin on the surface of the product, a thin film is formed that prevents the evaporation of styrene and the oxidation of the inner layers of the varnish. This is what makes it possible to achieve a film-forming coating that is distinguished by its strength.
The methodology for applying wax-based wood varnish is by pouring and spraying. Dries processedsurface for at least 180 minutes at a temperature of +20 oC (±2 oC).
Percentage of dry residue of the paraffin-containing polyester composition - up to 94.95%. This is a property that allows minimizing the consumption of paintwork materials for coating the surface of furniture on an industrial scale.
Features of unwaxed varnishes
Alkyd resins in the composition increase the adhesive properties of surfaces. The dry residue indicators of such varnishes are lower, but the boundaries of the temperature range allow this material to be used wider than waxed varnishes.
To apply to the surface of a wooden product, a pouring method or a special pneumatic sprayer in an electrostatic field of high voltage currents is used. When using the latter method, it is possible to significantly save on the consumption of the polyester composition.
Main characteristics of polyester varnish for metal
Metal, a material characterized by strength and reliability, but like everything that surrounds us, sooner or later it loses its characteristics, becoming unusable. It is worth noting that outdoor structures fall into disrepair faster than others.
With the constant exposure of the metal surface to sunlight, precipitation, temperature changes and other climatic factors and the influence of the environment, rust forms on the metal surface, which indicates an irreversible reaction - corrosion.
To protect metal bases from such a fate, are usedspecial varnishes and paints, including polyester varnish for metal. Such coatings contribute to the formation of a special protective decorative layer on the surface of the product.
Several techniques are used to apply coatings to metal structures:
- with a brush;
- through a roller;
- when using a spray gun;
- through a can.
Of course, the last two options are preferable due to the fact that the varnish lays down evenly and is consumed more slowly, evenly penetrating deep into the structure of the surface layer of the material and forming a reliable protective coating.
It is worth noting that among the properties of polyester varnish is a strong water repellency that protects the surface of both metal and wood from corrosion and decay, respectively.
Now you understand what a polyester composition is and why it is needed. The above features of certain types of polyester-based coatings will help you focus on choosing the right option, narrowing the range of product range depending on the need.
