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

Abstract: This paper introduces the sublimation thermal transfer technology, and polyurethane powder coatings at the sublimation thermal transfer application. Transfer process and analyzed some of the factors affecting peeling.

  Keywords: polyurethane powder transfer factors affecting peeling

1, Introduction Powder coating is environmentally friendly, economical, efficient and superior performance of the "Four E" advantages. With the increased awareness of environmental protection, powder coating application more and more popular. Particular texture powder paint art, its unique decorative effect, and beautiful appearance, but also by the people's love. In recent years, transfer technology in powder coating application, can be arbitrarily complex texture patterns.

Transfer technologies, research in the history of art texture powder that milestone. Polyurethane powder coating has a high crosslink density, excellent pattern transfer performance. Therefore in PU is widely used in heat transfer in, has become the mainstream in Europe. Used for building and home decoration everywhere. However, in Asia, due to patent monopoly, and some material factors, thermal transfer application to P / TGIC system-based. However, in some cases the special application needs, or had to choose polyurethane powder.

2, transfer technology Transfer can be divided into two types of heat transfer and water transfer. Water transfer is the use of water as the medium, to have been printed on paper-based or special color PVA film patterns are transferred to the surface of the transfer printing method, stickers, and water into water, drape two. Expensive than thermal transfer equipment, in the powder coatings industry less; heat transfer was first adopted by the digital pattern printing equipment, the pattern printed on special paper, special transfer, and then printed on transfer paper pattern close to the substrate surface to high temperature and pressure of the sublimation transfer technology to transfer images accurately to the substrates surface. Heat transfer paper method is divided into cement paste stickers and sticker vacuum method two. Transfer powder is texture powder breakthrough. Texture than the traditional powder (color pink, gold and silver powder patterns, point pollen) more control over the texture, you can easily access a variety of complex patterns.

2,1 Heat Sublimation thermal transfer is based on principles of work, the substrate coated with a thermosetting material is completely cured and the transfer paper closely contacted at 150 --- 250 , the printing ink through sublimation the surface coating material transfer in the end. Heat transfer film was initially to the pattern, printed using thermal transfer technology to the aluminum substrate of polyurethane powder coating surface to achieve the imitation wood or stone decorative effect. In the 3-5 minutes it will need wood or marble patterns, rapid transfer to the aluminum powder coating the surface, and penetrate within the coating 40?? 60 microns. Because of its corrosion resistance, impact resistance, abrasion resistance; anti-aging, good for outdoor use can maintain for 15 years does not change color; light weight, high strength excellent physical and chemical properties; clear and vivid patterns; highly advanced visual effects . Widely used in doors and windows, furniture, indoor and outdoor decoration, building materials and other industries. As the polyurethane curing agent powder affected by the monopoly, the price expensive. China in turn applied to the polyester transfer / TGIC and epoxy / polyester systems.

2,2 thermal transfer technology Method I posted the vacuum transfer paper, for example, introduce the aluminum thermal transfer process.

(1) film with a cutting machine to transfer film volume (buy to transfer film to 1000 m roll) cut to the required size.

(2) will cut a good transfer film packaging machines with ultrasonic welding according to the size of the workpiece into the workpiece wrapped bags.

(3) the packaging platform, will be sprayed powder and fully curing the workpiece into the workpiece is made with the transfer film wrapped bags.

(4) improve the package thermal transfer printing film machine parts on the car platform, in turn can hold 18 of aluminum, the aluminum wrap and bags of both ends of the tap connected to a vacuum lock, open the vacuum switch, At this point transfer film attached tightly on the aluminum. Aluminum car automatically sent to baking furnace, oven temperature 220 degrees automatically and heat 3 minutes, the car automatically exit the oven.

(5) Release the vacuum tap, remove the workpiece. To transfer paper and the work piece drum gas separation, remove the transfer film, and check the quality of parts.

2,3 Precautions transfer powder formulation

(1), reference and other equivalent response ratio to ensure complete curing.

(2), do not add irrelevant wax, so as not to transfer images fuzzy.

(3), add the appropriate functional filler to increase the hardness.

(4), ensure the membrane surface fullness, DOI good.

2,4 film surface, Tg, the relationship between hardness and peeling

Polyurethane powder formula to use two different hydroxyl value of resin, so that coating the surface of microscopic irregularities, transfer paper at the coating surface adsorption forces are not the same, good peeling; Second, the coating can not generated back to Visco, TG at 80? 110 suitable. Tg below 50 degrees, transfer time (180 --- 220 ) coating softening effect peeling. TG higher than 130 , the coating is too brittle and easy to cause damage to routine use in the substrate; again, the hardness is also important, low hardness bad paper tear, hardness at least 3N to peeling. Hardness is too high, pattern can not transfer (or total transfer takes a long time), transfer of the adhesion and penetration are poor. Experience in the transfer temperature (such as 200 ), the test coating scratch resistance (Oesterle scratch resistance tester model 435), good for at least 8N, the best of at least 11N. Scratch-resistant ceiling depends on the thermal transfer time, the longest transfer time and depends on the film's thermal stability. In general however, the largest anti-scratch should be less than 30N.
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