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Fluorocarbon polymer contains C-F bonds, with high bond energy (486 KJ/mol), and fluorine atomic radius is small, electro-negative (4.0) large and polarization rate is very low, so the fluorocarbon resin is given many excellent performance. Thanks to this, fluorocarbon coatings as high-performance coatings with ultra-climate aging resistance, chemical corrosion resistance, strong stability and other characteristics, than the popular polyurethane, silicone, acrylic coating performance is superior, is widely used in the construction field, large-scale structures, transportation and outdoor signs.
recent years, based on environmental regulations, VOC (volatile organic compounds, volatile organic compounds) emissions around the world began to be strictly controlled, the hydration of fluorocarbon coatings has become a trend of development
China
.in the preparation of
synthesizer
water-based fluorocarbon resins, the monosomes used can be divided into fluorine-containing and non-fluorine-containing monoglycers, commonly used fluorine-containing monoglycers are Teflon, Teflon, difluoroethylene, fluoroethylene, hexafluoropropylene, fluorocarbon ethylene (acrylic) esters or ethers. Although the ionum or co-polymers of these HFOF monomers have the advantages of high temperature, weather resistance and chemical stability, they also have the disadvantage that processing is not easy and must be filmed at high temperatures. Therefore, non-fluorine monomer co-polymerization is required to reduce its crystallization in order to obtain fluorocarbon resins that can be cured at room or medium temperature.
non-fluorinated monosomes often imported from water-based fluorocarbon resins are vinyl ethers, ethylene pyridine and acrylics. Vinyl ethers have cycloethylene ether, hydroxyvinyl ether, ethyl vinyl ether, etc.; vinyl acetate includes ethylene acetate, vinyl butylate, vinyl acrylic, etc.; acrylic has acrylic, ethyl acrylic, acrylic cycloethyl and methyl acrylates, methyl acrylates.
synthesis method
fluorocarbon emulsion preparation is similar to the preparation of general emulsion, the common methods are the following four:
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1
solution polymerization
solution polymerization Fluoroolefins and other co-polymer monomers are dissolved in solvents, in the presence of oil-based triggers for solution polymerization, and then under the protection of emulsifying agents by mechanical high-speed stirring resin dispersed in water to form a water-based fluorocarbon resin, belongs to the oil-to-water type resin. These products usually contain a small amount of solvent, the technical door is low, usually in order to comply with VOC regulations also need to remove solvents.
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2
Emulsion Polymerization
Emulsion polymerization is the fluoroolefin monomer and other co-polymer monomers mixed with emulsions, regulators, etc., in the presence of triggers, direct emulsion polymerization in water method, the current mainstream FEVE emulsion is using this method preparation, that is, teflon-based monomer and fluorine-free vinyl ether monomer free-based emulsion polymerization.
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3
Nuclear shell emulsion polymerization
nuclear shell emulsion polymerization is to meet certain special needs of the process used, by selecting different performance monosomes, adjust the required ratio to meet the special performance requirements of emulsion particles. Can solve the emulsion used in coatings soft, sticky and poor resistance to dirt and other shortcomings, but also to solve the high crystallization of fluorocarbon polymers and high glass transfer temperature makes the coating difficult to process, but also can prepare low-temperature film fluorocarbon resin, so that its application is more extensive.
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4
Soap-free polymerization
soap-free polymerization is a synthetic method that can reduce or achieve emulsion polymerization without the emulsifying agent used in general emulsification polymerization, which can improve the resin's water resistance, soil resistance, etc. The use of water-based fluorocarbon resins in preparation can improve their materialization, especially by significantly increasing weather and water resistance. Soap-free polymerization products are generally based on the type of dispersion, first in the solvent polymer resin, by the polymer main chain modification, so that it has acid-based can be dispersed in water, but also belongs to the oil-to-water type resin, still need to be removed solvent.
in recent years, the construction market has developed rapidly, and the demand for high-standard coatings for building facades has also increased dramatically. For example, Beijing for the building exterior paint clearly stipulates: anti-aging performance must be more than 15 years, material requirements low toxicity, which brings great business opportunities for the development of water-based fluorocarbon coatings. The synthesis of fluorine emulsions in water-based fluorocarbon coatings, the research and development of supporting additives, the optimization of supporting systems and the improvement of construction processes will be the focus of research and development.