1.2.2 Fluoropolymer Coatings
Fluorine-containing polyurethane coatings have excellent weathering resistance, color retention and heat resistance, corrosion resistance, chemical resistance, room-temperature curing, and comprehensive performance unmatched by other coatings. They are widely used in aerospace, bridges, and vehicles. Marine anti-corrosion and construction and other fields are protective and decorative coatings for aluminum, steel, cement, plastic, and wood surfaces.
Fluorine-containing polyurethane coatings use the principle of hydroxyl-curing two-component polyurethane coatings. Hydroxy-containing fluororesins and polyisocyanates, which are components of the curing agent, are formulated as fluorine-containing polyurethane coatings that can be crosslinked at room temperature. As a functional group, the fluorinated copolymer is cured by crosslinking with a polyisocyanate at room temperature, and has been widely used not only for its excellent chemical properties but also for its versatile coating properties.
RobertF. Brady reported on a fluorine-containing polyurethane coating developed by the U.S. Navy. The formulation contained 34% (volume fraction) of polytetrafluoroethylene, hexamethylene diisocyanate as a curing agent, and dibutyltin dilaurate as a drying agent. The paint has excellent appearance, weather resistance, heat resistance and corrosion resistance. It can be used as aircraft exterior paint, fuel storage tank paint, ship antifouling paint, automotive paint and so on.
Zhang Yongming et al. synthesized hydroxyl-containing fluorosilicone resin and used 60 parts of this resin as raw materials, 30 parts of methyl isobutyl ketone/xylene (2:1), 10 parts of additives, and 25 parts of HDl (as curing agent). Made of varnish. The varnish not only has good adhesion and mechanical strength, but also has high heat resistance, weather resistance, good hydrophobicity and stain resistance, and has great potential application value in anti-corrosion coatings and anti-fouling coatings.
1.2.3 Fluorine-containing epoxy resin coating
The fluorine-containing epoxy resin can not only improve the solubility of the epoxy resin, but also improve the heat resistance, wear resistance, and corrosion resistance of the epoxy resin. Wuhan University of Technology Unisong High uses 2,2-bis(4-hydroxybenzene)-1,l,1,3,3,3-hexafluoropropane for condensation polymerization with epichlorohydrin, the introduction of fluorine atoms not only The solubility of the epoxy resin is increased and the heat resistance is improved.
Wuhan University New Technology Research Institute Shi Mingde, etc. using epoxy resin modified vinylidene fluoride - tetrafluoroethylene - hexafluoropropylene copolymer, obtained epoxy modified organic fluorine coating, both the advantages of epoxy resin and organic fluorine resin It not only has good adhesion, but also has good mechanical properties and resistance to organic solvents, and has broad application prospects.
1.2.4 Fluorine-Containing Silicone Coatings
The fluorine-containing organosilicon coating can be cured at room temperature and has excellent corrosion resistance, impact resistance, adhesion and weather resistance, and its service life can be more than 20 years. The WB99 fluorine-containing organosilicon coating developed by Shanghai Huisheng Silicone Science and Technology Co., Ltd. has been successfully applied to coating and protection of Nanpu Bridge cable jacket. The fluorine-containing organosilicon antifouling coatings developed by Mera et al. are suitable for the protection of undersea storage tanks, ships, fishing nets and wharves.
1.2.5 Fluoropolyphenylene sulfide coating
Polyphenylene sulfide coatings have excellent thermal stability, flame retardancy, chemical resistance, weatherability, and radiation resistance. Thin coatings and no pinholes. However, its main disadvantage is its large brittleness and easy cracking. It can be modified with organic fluorine, and it can be used for high corrosion resistance, heat resistance, and high toughness of fluororesin, high adhesion to polyphenylene sulfide, and thermal stability. The combination of pinholes and anti-corrosion properties results in a high-performance anti-corrosion coating. Ye Peng, Shandong University, etc. uses polyfluoroethylene-propylene as the top coat and polyphenylene sulfide as the base coat. It uses the principle of gradient functional materials, adds intermediate transition layers, and transitions in layers to increase the bond strength of coatings. A good anti-corrosion coating.
2 New Fluorine Coatings
With the development and application of surface-activated cross-linking technology, supercritical fluids, nanotechnology and other advanced technologies and materials, as well as the enhancement of people’s environmental health awareness, new types of fluorine coatings that are economical, efficient, environmentally friendly, and functional have developed rapidly and become The main development direction of fluorine coatings.
2.1 Waterborne Fluorine Coatings
Water-based fluorinated coatings not only have excellent weatherability, stain resistance, corrosion resistance and other properties of fluorinated materials, but also have the environmental protection, safety, and other properties of water-based paints. Therefore, they are increasingly attracting the attention of all countries in the world and are an important factor in the future development of the paint industry. direction. Schmidt, Dow Chemical Company, USA, first reported the use of reactive fluoropolymers to make non-stick coatings. The waterborne fluoropolymer coatings developed abroad have various forms such as water-soluble, water-dispersible and emulsion-like. However, most of the current aqueous fluoropolymers are still water-dispersible. Typical aqueous fluorine coatings are cathodic electrophoretic coatings made from fluoroolefins, vinyl ethers, carboxyl-containing compounds, and water-soluble amino resins. Japan’s research in this area is very active. Kawamura S and Hi-BiT of Japan Large Ink Company used flonated emulsion and epoxy silane as cross-linking agents to obtain durable and non-sticky water-based fluorinated coatings. The film formation temperature is 30～45°C. Among domestically developed water-based fluoropolymer coatings, Nanchang Institute of Aeronautics and Industry Rao Houzeng has developed NH-R water-based fluorinated coatings that are unique in that they are formulated from a fluorinated emulsion that does not cure itself and a certain percentage of additives. The coating has strong adhesion, aging resistance, corrosion resistance and chemical stability, and is easy to apply. It is widely used in aviation, marine development, energy, electronics and chemical industries.
(to be continued)
Fluorine-containing polyurethane coatings have excellent weathering resistance, color retention and heat resistance, corrosion resistance, chemical resistance, room-temperature curing, and comprehensive performance unmatched by other coatings. They are widely used in aerospace, bridges, and vehicles. Marine anti-corrosion and construction and other fields are protective and decorative coatings for aluminum, steel, cement, plastic, and wood surfaces.
Fluorine-containing polyurethane coatings use the principle of hydroxyl-curing two-component polyurethane coatings. Hydroxy-containing fluororesins and polyisocyanates, which are components of the curing agent, are formulated as fluorine-containing polyurethane coatings that can be crosslinked at room temperature. As a functional group, the fluorinated copolymer is cured by crosslinking with a polyisocyanate at room temperature, and has been widely used not only for its excellent chemical properties but also for its versatile coating properties.
RobertF. Brady reported on a fluorine-containing polyurethane coating developed by the U.S. Navy. The formulation contained 34% (volume fraction) of polytetrafluoroethylene, hexamethylene diisocyanate as a curing agent, and dibutyltin dilaurate as a drying agent. The paint has excellent appearance, weather resistance, heat resistance and corrosion resistance. It can be used as aircraft exterior paint, fuel storage tank paint, ship antifouling paint, automotive paint and so on.
Zhang Yongming et al. synthesized hydroxyl-containing fluorosilicone resin and used 60 parts of this resin as raw materials, 30 parts of methyl isobutyl ketone/xylene (2:1), 10 parts of additives, and 25 parts of HDl (as curing agent). Made of varnish. The varnish not only has good adhesion and mechanical strength, but also has high heat resistance, weather resistance, good hydrophobicity and stain resistance, and has great potential application value in anti-corrosion coatings and anti-fouling coatings.
1.2.3 Fluorine-containing epoxy resin coating
The fluorine-containing epoxy resin can not only improve the solubility of the epoxy resin, but also improve the heat resistance, wear resistance, and corrosion resistance of the epoxy resin. Wuhan University of Technology Unisong High uses 2,2-bis(4-hydroxybenzene)-1,l,1,3,3,3-hexafluoropropane for condensation polymerization with epichlorohydrin, the introduction of fluorine atoms not only The solubility of the epoxy resin is increased and the heat resistance is improved.
Wuhan University New Technology Research Institute Shi Mingde, etc. using epoxy resin modified vinylidene fluoride - tetrafluoroethylene - hexafluoropropylene copolymer, obtained epoxy modified organic fluorine coating, both the advantages of epoxy resin and organic fluorine resin It not only has good adhesion, but also has good mechanical properties and resistance to organic solvents, and has broad application prospects.
1.2.4 Fluorine-Containing Silicone Coatings
The fluorine-containing organosilicon coating can be cured at room temperature and has excellent corrosion resistance, impact resistance, adhesion and weather resistance, and its service life can be more than 20 years. The WB99 fluorine-containing organosilicon coating developed by Shanghai Huisheng Silicone Science and Technology Co., Ltd. has been successfully applied to coating and protection of Nanpu Bridge cable jacket. The fluorine-containing organosilicon antifouling coatings developed by Mera et al. are suitable for the protection of undersea storage tanks, ships, fishing nets and wharves.
1.2.5 Fluoropolyphenylene sulfide coating
Polyphenylene sulfide coatings have excellent thermal stability, flame retardancy, chemical resistance, weatherability, and radiation resistance. Thin coatings and no pinholes. However, its main disadvantage is its large brittleness and easy cracking. It can be modified with organic fluorine, and it can be used for high corrosion resistance, heat resistance, and high toughness of fluororesin, high adhesion to polyphenylene sulfide, and thermal stability. The combination of pinholes and anti-corrosion properties results in a high-performance anti-corrosion coating. Ye Peng, Shandong University, etc. uses polyfluoroethylene-propylene as the top coat and polyphenylene sulfide as the base coat. It uses the principle of gradient functional materials, adds intermediate transition layers, and transitions in layers to increase the bond strength of coatings. A good anti-corrosion coating.
2 New Fluorine Coatings
With the development and application of surface-activated cross-linking technology, supercritical fluids, nanotechnology and other advanced technologies and materials, as well as the enhancement of people’s environmental health awareness, new types of fluorine coatings that are economical, efficient, environmentally friendly, and functional have developed rapidly and become The main development direction of fluorine coatings.
2.1 Waterborne Fluorine Coatings
Water-based fluorinated coatings not only have excellent weatherability, stain resistance, corrosion resistance and other properties of fluorinated materials, but also have the environmental protection, safety, and other properties of water-based paints. Therefore, they are increasingly attracting the attention of all countries in the world and are an important factor in the future development of the paint industry. direction. Schmidt, Dow Chemical Company, USA, first reported the use of reactive fluoropolymers to make non-stick coatings. The waterborne fluoropolymer coatings developed abroad have various forms such as water-soluble, water-dispersible and emulsion-like. However, most of the current aqueous fluoropolymers are still water-dispersible. Typical aqueous fluorine coatings are cathodic electrophoretic coatings made from fluoroolefins, vinyl ethers, carboxyl-containing compounds, and water-soluble amino resins. Japan’s research in this area is very active. Kawamura S and Hi-BiT of Japan Large Ink Company used flonated emulsion and epoxy silane as cross-linking agents to obtain durable and non-sticky water-based fluorinated coatings. The film formation temperature is 30～45°C. Among domestically developed water-based fluoropolymer coatings, Nanchang Institute of Aeronautics and Industry Rao Houzeng has developed NH-R water-based fluorinated coatings that are unique in that they are formulated from a fluorinated emulsion that does not cure itself and a certain percentage of additives. The coating has strong adhesion, aging resistance, corrosion resistance and chemical stability, and is easy to apply. It is widely used in aviation, marine development, energy, electronics and chemical industries.
(to be continued)
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