Reactive Coatings

Powder, Epoxy and other Protective Coatings

polyurethane powder coatings in the sublimation thermal transfer technology application - transfer, polyurethane powder, the factors affecting bare

Abstract: This paper presents the technology of sublimation thermal transfer and polyurethane powder coatings to the application DS heat transfer. Transfer process and discussed some of the factors affecting peel.

Keywords: transfer factor of polyurethane powder affect skin
1, Introduction powder coating with the environment, economic, efficient and performance of the "Four E" advantages. With the growing awareness of environmental protection, application of powder paint increasingly popular. special texture powder paint art, its only decoration effect, beautiful appearance but also for the love of people. In recent years, the technology transfer in the application of powder coatings, can be arbitrarily complex patterns texture.

Technology transfer, research in art history texture powder that milestone. polyurethane powder coating has a density of crosslinking high, the excellent transfer performance model. Therefore in the UP is widely used in heat transfer, has become the mainstream in Europe. It is used for construction and home decoration everywhere. However, in Asia, due to patent monopoly, and some material factors transfer request thermal P / TGIC based on the system. However, in some cases special application needs, or had to choose polyurethane powder.

2, transfer Technology Transfer is divided into two types of heat transfer and water transfer. water transfer is the use of water as a medium, which has been printed in patterns colors on paper or special PVA film is transferred to the surface of the transfer printing method, stickers, and water in the water, cover two. Costly than heat transfer equipment in the powder coatings industry less, the heat transfer is first adopted by the team master of digital printing, the design printed on special paper, special transfer, and then printed on transfer paper pattern near the surface of the substrate temperature and high pressure technology transfer sublimation transfer images accurately to the surface of substrates. Heat transfer method is divided into cement paste stickers and label the vacuum method two. The transfer progress powder powder texture. Texture than traditional dust (pink, gold and silver patterns dust, pollen point) greater control over the texture, can easily access a variety of complex patterns.

Heat transfer 2.1 dye sublimation is based on the principles of work, the substrate coated with a thermosetting material is completely cured and the transfer paper closely contacted at 150 --- 250, the ink sublimation printing surface layer material transfer at the end. heat transfer film was initially the pattern, printed using technology heat transfer in the aluminum substrate surface polyurethane powder to achieve the imitation of wood or stone decorative effect. In the 3-5 minutes need wood or marble patterns, rapid transfer to the aluminum powder coating the surface, and penetrate the lining of 40? 60 microns. Because of its strength corrosion, impact resistance, abrasion resistance, anti-aging, good for outdoor use can be maintained for 15 years does not change color, weight lightweight, high strength excellent physical and chemical properties, clear and vivid patterns, very powerful visual effects. Widely used in doors and windows, furniture, decoration interior and exterior building materials and other industries. As the polyurethane curing agent powder affected by the monopoly, the price expensive. China in turn applies transfer polyester / TGIC and epoxy / polyester systems.

2.2 Method thermal transfer technology have published the document of transfer vacuum, for example, introducing the heat transfer process of aluminum.

(1) film with a cutting machine for the transfer of volume the film (purchase to transfer the film to roll m 1000) cut to size.

(Two) reduce the amount of a good movie packaging machine ultrasonic welding according to the size of the workpiece in the workpiece wrapped bags.

(3) packaging platform, will Dust dash and completely cured of the workpiece in the workpiece is done with the transfer film wrapped bags.

(4) improve the print pack thermal transfer film machine parts on the platform of the car, turn 18 may contain aluminum, aluminum foil and bags of the two ends of tap connected to a vacuum lock, open the vacuum switch, On this point transfer film attached tightly on aluminum. aluminum cars automatically sends a baking furnace, oven temperature 220 degrees automatically heat and 3 minutes, the car automatically out of the oven.

(5) Cut vacuum tap, remove the workpiece. To transfer the role and the work gas separation drum, remove the transfer film, and check the quality parts.

2.3 Precautions transfer powder formulation
(1), reference and other equivalent response rate to ensure a cure complete.
(2), do not add wax irrelevant, not to transfer the images blur.
(3), add the filling to increase functional strength.
(4) ensure the full surface of the membrane, DOI good.
Surface film 2.4, Tg, the relationship between hardness and exfoliation

powdered formula polyurethane to use two different hydroxyl values of the resin, so that the coating on the surface of the microscopic irregularities, transfer paper forces adsorption surface coating is not the same thing, good peeling; Secondly, the layer can not be generated back to Visco, TG 80? Appropriate 110. Tg below 50 degrees, transfer time (180 --- 220) softening effect coating peeling. TG greater than 130, the layer is too fragile and easy to damage the routine use in the substrate, again, the hardness is also important, role of bad tear low hardness, hardness at least 3N to peeling. The hardness is too high, the employer can not transfer (or total transfer takes a long time), the transfer of the adhesion and penetration is poor. Experience in the transfer temperature (for example as, 200), the coating scratch resistance test (zero Oesterle resistance tester model 435), well at least 8N, the best of at least 11N. scratch-resistant roof depends of the thermal transfer time, the longest time and depends on the thermal stability of the film. In general, however, the largest anti-zero must be less than 30N. About the Author

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