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1 Foreword
weather-resistant powder coating polyester/TGIC type in the curing reaction, because no volatile parts produced, it can be made into a thick coating film without pores, with good weather resistance, and has an excellent coating appearance. However, the main disadvantage of polyester/TGIC powder coating is that the curing agent TGIC is more toxic, irritating to the skin, affected by the pressure of environmentally friendly and healthy forms, more and more countries restrict its use. Substitute TGIC curing agent polyester/ HAA (hydroxyalinelamide) system powder coating, after more than ten years of twists and turns of the development path, in today's society to health, environmental protection, energy-saving trend for the global mainstream pressure, slowly mature, its market share increased byIn the weather-resistant powder market has accounted for about 40% of the share, close to half of the mountain. In Europe, more than half are used. However, the process of environmental protection requirements in China lags behind, and polyester/TGIC powder coating system still occupies an advantage.
HAA system has the same outdoor durability as TGIC series powder, after many years of tracking and testing by domestic and foreign companies, HAA replacement (most of the replacement) TGIC has been a firm conclusion. Whether it is the increase of HAA users, or the reduction of TGIC, PU users, all start from the care of human health, reduce pollution of the earth's environment and energy conservation. HAA system powder coating can achieve low temperature curing, non-toxicity, good stability of coating storage, low cost of coating formulation, HAA reaction activity is stronger than TGIC, can be adapted to friction gun spraying.
HAA system has advantages in health and environmental protection, some physical and chemical performance restricts its development. Hydroxyacetylamide releases small molecular compounds such as water during the curing of polyester, and the coating is too thick to make pinholes. The heat resistance is worse than that of the TGIC system. Hydroxylamide preparation of high-gloss flat powder coating, the surface is not dense enough, affecting the decorative, more used in the production of sand, hammer and other powders do not require a flat appearance. Therefore, it is necessary to focus on research and development to solve the technical problems such as thick coating pinholes, yellowing, acid rain resistance and so on.
HAA curing agent representative product is XL552, its weak point is the appearance of flat, yellow change, pinholes, which is also the powder coating manufacturers, coating application enterprises and powder coating technicians concerned about the key issues.
himself, through his research and practice at ROYAL Powder Coatings in Turkey, has solved the problem of yellowing, gas-resistant baking and hydrolytic and applying thickly coated pinholes in the XL552 using Primid system improved curing agent products developed by SWISS EMS.
2 Improved HAA curing agent properties
2.1 QM 1260 mainly solves the yellowing, gas-resistant baking and hydrolyzing problems of XL552
Can also replace isocyanate triglycerides (TGIC) as a curing agent for weather-resistant powder coatings, used in hydroxy polyester resin and polyacrylic resin crosslinking, can be equipped with non-biological mutation, better weather resistance, non-toxic polyester powder coating, which is mainly due to the unique chemical structure of QM1260. The hydroxyl of the curing agent QM1260 is in β bits, susceptible to N-atoms, very high activity, can be used as a chemical intermediate, and easy to esterify the reaction with niobium-based, under the condition of no catalyst, can still be well cured with pyridine-containing polyester resin and polypropylene resin. In addition, powder coatings cured by QM1260 curing agents have better impact resistance and better leveling than powder coatings cured with TGIC, and because HAA has a high melting point, the curing agent QM1260 can be very energy efficient, with a minimum of 150 degrees C/20-25min completely cured. The curing agent QM1260 system powder coating friction charge is good, because it has its own blocking amine structure, and can reduce the spray voltage, can also usewipe spray gun for construction.
: 1. Gardner color less than 0.5; 2. Moisture content less than 1.0%; 3. Melting point range 100-115 degrees C; (4) hydroxy value 550-650mgKOH/g.
2.2 SF4510 mainly solves the problem of thickly coated pinholes
. SF4510 is a reactive crosslinker that can select a wide range of resins with a pyrethroid resin value of 20 to 80. Particularly suitable for high-gloss powder coatings, in syxyneamide powder coatings, not only has environmental protection pollution-free and can withstand exposure testing in Florida, but also has better mobility, excellent degassing performance, can meet the higher film thickness, and can improve live performance and excellent baking resistance.
: 1. Gardner color less than 1.0; 2. Moisture content less than 1.0%; 3. hydroxy value 550-650mg KOH/g.
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Source: 2018 China Powder Coatings and Coatings Industry Annual Meeting
Xujing Quan Yantai Yuanli Machinery Manufacturing Co.,
.