The five drying methods for waterborne coatings, you must learn to dry!
1, naturally boring
Natural boring is the advantage of simple method and universal application, but at the same time it has the drawback of slow drying speed. Under natural conditions, temperature and humidity and wind speed are changed from time to time, and the drying speed and film formation quality are unstable.
2, microwave boring
Microwave heating is based on the principle of dielectric loss, and the dielectric constant of water is much larger than that of dry matter. The vast majority of the energy released by the electromagnetic field is absorbed by the moisture in the coating. The advantage of microwave heating is that the drying speed is extremely fast, and different substances have selective absorption with respect to microwaves. The heating of the coating film is average, there is no temperature gradient, and the thick film can be dull.
3, UV boring
The water-based paint contains a small amount of photosensitizer. Under the ultraviolet light, the photosensitizer absorbs ultraviolet light of a specific wavelength, synthesizes a reactive group, and initiates polymerization reaction of the film-forming substance to form a network structure to cure the coating. UV curing has the characteristics of fast coating curing speed and good film quality. but. This method can only be used for dry water-based paints, and can only be dried into flat-shaped furniture coated panels.
4, infrared boring
Infrared curing has the advantages of fast curing speed, rapid temperature rise, good curing quality, etc., but when the coating is dried by infrared heating, the coating has a significant temperature gradient, and its boring is extended from the outside to the inside, which makes it It is not suitable for use in boring and thick coatings; infrared ray can only heat the area where infrared rays can be reflected, and cannot be used for boring flat objects.
5, hot air is boring
Hot air boring is a heating and boring method using a convection principle, a hot air having a temperature of 40 to 60 ° C as a heat carrier, and a heat transfer energy to a coating on the surface of the workpiece, and the coating absorbs energy and solidifies into a film. Commonly used electricity or steam as a heat source, the air is first heated, and the heat is transferred from the hot air to the surface of the coating by convection, so that the coating is quickly and boring.
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