Organic fluorine coating research and application (3)
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Like water-based fluorinated coatings, high-solid fluorine-based coatings and fluororesin powder coatings are also environmentally friendly. Fluoro-resin powder coatings prepared from thermoplastic PVDF resins have been marketed for a long time, but due to their poor dispersion and high-temperature baking, their use is narrow. In recent years, a thermosetting fluororesin coating can be prepared by using a fluororesin having a fluoroolefin vinyl ether as a main chain and having a crosslinkable reactive group such as a hydroxyl group melted at 100°C. Zhang Yunxiang and others from the Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, used Tetrafluorene ETFE (ethylene, tetrafluoroethylene copolymers) to produce powder coatings with excellent properties. Stefano et al. used perfluoroether polyurethane and perfluoroether polyesters. Series high-solid fluorine resin coating.
2.3 super weathering fluoride coating
Organic fluorine resin has excellent weather resistance, weather resistance of coatings modified with fluorine-modified polyacrylates, polyurethanes, and epoxy resins is also significantly improved, and can be used for outdoor long-term, high decorative protective coatings. The fluorine-containing acrylate coating has excellent weather resistance, good gloss and color retention, is not easy to chalk, and has good gloss. He Xiaolu and others have developed a super weather resistant color acrylic fluorinated coating that can be applied to outdoor and a variety of plastic products. Fluorine-containing polyurethane coatings have excellent moisture resistance and ultraviolet light resistance and are widely used for the protection of aircraft skins, automotive coatings, large tank surfaces, and stone artifacts.
2.4 fire retardant fluorine coating
Since the amount of fluorine atoms in the fluorine resin and the fluorine-containing resin accounts for 25%-50% of the resin, it itself has flame-retardant and fire-retardant properties. For example, the limited oxygen index (PVI) of polyvinylidene fluoride (PVDF) is 440, and the oxygen limiting index of ethylene tetrafluoroethylene (ETFE) is 30, which is higher than the oxygen content in the air, so it can be self-extinguished in air. , showing a higher flame retardant performance. Combined with ultrafine layered silicates, hydrated alumina, and magnesium oxide, it can be made into high-efficiency, low-smoke and low-toxic paints. The current market for ultra-thin steel fire-retardant fluorine coatings is increasingly promising.
2.5 Antifouling Self-cleaning Fluorine Coatings
Due to the dense molecular structure of the fluorine coating, its surface friction coefficient is low, the induced voltage on the surface of the paint film is high, the surface energy is low, and it is not easy to cause static electricity, there is anti-soil residency and strong hydrophobicity, so that dust, It is difficult for water to adhere to the surface of the coating film. Nanotechnology is used to form the surface of the lotus leaf structure. It has excellent stain resistance and self-cleaning properties. Can be made of environmentally friendly marine anti-fouling coatings, can also be made into car shell protection coating, self-cleaning exterior paint, aircraft anti-ice and snow paint.
2.6 Anti-stick and wear-resistant fluorocoating
Since the fluoropolymer has a small atomic radius, a small polarizability, and a small surface tension, it exhibits an anti-sticking property, and the fluororesin has a small cohesive energy and a low friction coefficient, and is used as a base material for a wear-resistant lubricating coating. Lubricants have more prominent wear-resistant lubricating properties, so they are widely used in molds, cookware, household appliances, machinery and equipment. Luo Guoqin et al developed a water-based single-layer fluororesin anti-stick coating, and Wang Wenliang and others also developed ZF-426 water-based anti-sticking and easy-cleaning, one-spray and one-drying fluorine coatings. Foreign So-da, Yoshihiro and other tetrafluoroethylene dispersion polyether Permarin VA200, made a good non-viscous wear-resistant coating.
With the continuous research and development of new materials and improvements, organic fluorine coating research will be more and more in-depth, performance will become more and more excellent, to meet the different requirements of different industries or areas of paint requirements. At the same time, as people's awareness of environmental protection increases, organic fluorine coatings will also develop in the direction of pollution-free and environment-friendly. Organic fluorine coating as the best performance coating species, will increasingly attract people's attention, and get a wide range of deep-level applications in specific areas.
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