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    Home > Coatings News > Paints and Coatings Market > Research and application of outdoor ultra-heat-resistant transfer wood-print powder coating.

    Research and application of outdoor ultra-heat-resistant transfer wood-print powder coating.

    • Last Update: 2020-10-16
    • Source: Internet
    • Author: User
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    Wen/Qiu Xianfeng, Wang Wenjun, Liu Wu, Zheng Zhengwei
    Guangdong Smart Environmental Technology Co., Ltd.
    Abstract:
    This article introduces outdoor ultra-heat-resistant transfer wood-printed powder coating design, transfer process control and transfer paper / film selection and matching.
    powder coating as a new type of environmentally friendly products, in recent years at home and abroad rapid development, according to the Paint Association statistics of the country's large and small powder coating factory as many as 4000. With the national environmental protection and high pressure, more and more industries, more and more fields, is from the traditional paint spraying to powder coating

    . Thermal transfer wood powder coating through the heat transfer process, get a variety of patterns, especially simulation of wood visual effects, in furniture, doors, windows, the application of warm and natural visual effects, compared to solid wood more environmentally friendly, low maintenance costs, durable, has been loved and recognized by customers.
    With the development of wood-printed thermal transfer, more and more wood-printed profiles are used outdoors, strong ultraviolet light always tests the weather-resistant quality of thermal transfer wood-printed powder coating, how to make thermal transfer wood-print powder coating durable has become the direction of continuous research and eternal pursuit of wise people.
    1 Outdoor heat-resistant transfer wood-print powder coating formulation design
    powder coating outdoors by moisture, temperature and intensity of sunlight, if its weather resistance is not good, after a period of use will produce fade and gloss loss, cracking, powdering, mechanical strength loss and even peeling off. Due to the polyester/β-HAA system thermal transfer tear paper difficult problem so far has not been very good to solve, the current outdoor heat-resistant transfer wood-print powder coating is mainly polyester/TGIC, polyester/isocyanate type and fluorocarbon system.
    methods for aging testing are currently more approved for xenon lamps and Florida sun exposure in the United States, AAMA2603/2064 in the United States and QUALIDECO in Europe.
    1.1 polyester initial choice
    powder coating after a long period of use, coating polymer aging is mainly reflected in the loss of coating gloss, color changes, powder cracking and so on. Under the action of photooxygen, a part of the polymer molecular chain breaks, forming a low molecular weight substance, washed away by rain to form a rough surface, as shown by: reduced gloss, inadequate coating protection of pigments fade, powder, and even cracking and other phenomena. These need to point out that when we do outdoor high and low acid polyester dry mixed light system, we will find that this part of the product in the use of a certain period of time gloss will increase, this is due to high and low acid polyester dry mixed light system itself surface rough, diffuse line, under the action of light oxygen, the formation of these low molecular weight substances washed by rain but form a smooth surface, gloss rise, of course, this phenomenon only appears in a specific period of time, long-term performance. It can be seen that resin plays a decisive role in the weather resistance of thermal transfer wood grain powder coating.
    from Table 1 can be seen that the above resins can meet the current industry said that the ten-year outdoor weather resistance requirements, but after the heat transfer is obviously resin A and resin B can not meet the QUALIDECO Class1 requirements. Therefore, for outdoor heat-resistant transfer wood-print powder coating design needs to use the base powder xenon lamp 1000 hours test, its preservation rate can still reach more than 75% polyester.
    1.2 polyester in-depth selection
    from Table 1 we found that the preservation rate of resin C is much worse than that of resin D, but its color change is similar to that of resin D. This is due to the depth difference between the penetration of different resins on the transfer ink.
    Our study found that resins with different acid values will have differences in the depth of ink penetration, resins with the same type of acid value, different resin manufacturers' brands, ink penetration depth will vary, acid values between 20-35mg KOH/g, ink penetration depth of 60-80m The acid value is about 40 mgKOH/g, the ink penetration depth is 50-60 m, the acid value is 50 mg KOH/g, and the ink penetration depth is 40-60 m (the above study is based on the transfer temperature of 200 degrees C transfer time of 2 minutes).
    in the formulation design, under the premise of the same weather resistance level, try to choose the ink penetration deep resin, transfer texture will protect more durable.
    1.3 Use of titanium dioxide
    When titanium dioxide is exposed to light (ultraviolet light) at wavelengths ≤387.5nm), the electrons of the price band will gain the energy of the photons and jump to the guide band to form photoelectronic e-), while the photoretic e-) is correspondingly formed in the price band.
    Because of the redstone type of TiO2 oxygen adsorption capacity is lower than the sharp titanium type, its weather resistance is better, the current surface of titanium dioxide modified way is: silicon aluminum coating, tantalum aluminum coating, etc. , the purpose is also to isolate titanium dioxide and ultraviolet direct contact, reduce titanium dioxide and oxygen in the air contact, thereby improving weather resistance.
    Non-transfer weather resistant powder coating formulation design time in addition to the above well-known type of titanium dioxide type selected goldstone type and has done cladding treatment, in the heat transfer weather resistant wood-print powder coating also need to pay attention to the amount of titanium dioxide.
    From Table 3 can be seen with the increase in the content of titanium white powder thermal transfer after the wood grain product color change level is increased, so in doing red acid branches, golden oak, cherry wood and other products need to strictly control the content of titanium white powder, currently do heat-resistant transfer wood grain products white (titanium white powder content >18%) recommended to do white oak products.
    2 Thermal transfer process control
    transfer process conditions for thermal transfer wood grain products weather resistance is essential, usually we only find different transfer temperature and transfer time, transfer out of the color will be different! In-depth studies have found that the incoality of these colors is due to the ink heat sublimation to the size and depth of the coating.
    table 4, we can see that as the transfer temperature increases or the transfer time increases, the depth of ink penetration deepens. In doing weather-resistant heat transfer wood grain products, according to the relevant transfer paper / film supplier recommended transfer temperature is as follows:
    3 transfer base powder and transfer paper with the reasonableness
    Many people have such a misunderstanding, think that as long as the use of weather-resistant bottom powder and weather-resistant wood grain paper / film, you can ensure that wood-print product weather resistance, in fact, it is not. Because the wood texture color difference measurement point as long as the slight deviation chroma value will be very different, the use of chroma meter to assess the color change color color of wood grain products color difference error is large. Ultimately, the vast majority of people agree that grayscale is the standard, grayscale value ≥4 grayscale value (ISO105-A02), as a qualified product.
    Due to the particularity of wood grain products, we should use transfer paper / film and transfer base powder as close as possible, such wood products after long-term use of visual fading situation will not be very obvious. Here we recommend that each newly designed weather-resistant wood grain product be tested for xenon aging before it is put on the market to ensure user satisfaction with the wood grain product.
    In recent years, thanks to the rapid development of the aluminum profile market, thermal transfer powder coating products with its realistic decorative effects and colorful colors, by the majority of users love, colorful wood color to meet the consumer yearning for a natural, comfortable life. Wood-print transfer process can make the production of wood-printed profile texture clear, three-dimensional sense, more reflect the natural feeling of wood, is the ideal alternative to wood energy-saving environmental protection materials, in line with the current advocacy of "aluminum wood" concept of green environmental protection, wood-print series of powder coatings in the door and window industry Has also been widely used, in the next all-aluminum furniture will also be brilliant, in order to weather-resistant wood grain products market benign development, wood-print transfer products related suppliers should work together to improve weather-resistant wood-print product grade, for our customers to provide more durable products.
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