News Details
The coating is HDI biurea
2017-5-3 16:26:24
The coating is HDI biurea. The FEVE fluorocarbon coating has been adopted by most users by using HDI biurea (DesmodurN 75) as the most cross-linking agent. In recent years, the development of HDI trimer and IPDI trimer have been superior to HDI biurea in some performance, and market demand is increasing.
Compared with HDI biurea, HDI trimer and IPDI are used as crosslinking agents, and the coating has many advantages such as high hardness and good light. The gk-570 fluorine resin is formulated by the formula, and separately with the Desmodur. N 75, Desmodur? N 3390 and Desmodur? N 3390 / Z4470 (quality ratio 4:1) 3 crosslinking agents for the paint, N (-nco)/N (-oh), 1.05:1, for performance comparison.
Using N 3390 as the crosslinking agent, the coating performance is the best and the performance is better than N 75. Using N 3390 / Z4470 as the crosslinking agent, the anti-shock performance was reduced, but the performance of artificial acceleration was most prominent.
The reason of the analysis is that because HDI diurea molecules are linear, the film is flexible. And the HDI trimer and IPDI trimer have a ring structure, which is more rigid, especially IPDI trimer, which can obviously improve the coating hardness.
After the causation of alkali (acid) catalysis and ultraviolet radiation, the ammonia-coated ammoniac bonds are decomposed into small molecular products, resulting in degraded performance.
Compared with HDI biuret, HDI trimer and IPDI trimer as crosslinking agent of coating of ammonia ester bond than part of isocyanate crosslinking agent is relatively stable, so in the chemical medium resistance, salt fog resistance and anti ultraviolet ageing performance is more outstanding.
HDI trimer viscosity than HDI biuret low viscosity, high solid content paint construction, reduce the VOC content in the coating, is beneficial to environmental protection, and other performance and HDI biuret.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
IPDI trimer can be used in the construction of short period of time. Because of its hard and crisp, non-impact, flexible and so on, it is usually not used alone, often with HDI system crosslinking agent.
The difference in performance of different type teflon resin. By comparison of the performance of four fluorine resin coatings, it is shown that the different structure of tetrafluororesins directly influences the performance of the coating. From the Angle of chemical structure, it is best to surround the structure of the unit with four fluoroethylene units.
In other words, the tetrafluoroethylene unit should be aligned with the copolymerization unit. Because of the monomer rate, the tetrafluoroethylene/vinyl fluorine resin will not be the graft of ether and ether, the ideal alternate copolymer (ABABAB...). In the molecular link, the less stable vinyl ether fragment is shielded and surrounded by the stable, better tetrafluoroethylene fragments.
In addition, as a result of the fluorine atom electronegativity, with more negative charges, adjacent fluorine atoms repel each other, and make the connection of fluorine atoms on the main chain of the polymer molecules fully extended, the molecular main chain into helical conformation.
The helical conformation of the surface of the molecular structure has more fluorine atoms, high key can C - F key low bond energy of C - C key can be fully protected, give the film high chemical resistance and aging resistance. The gk-570 resins are the type teflon. The tetrafluorotype of our country is mainly tetrafluoroethylene/vinyl ester.
Vinyl acetate (VAc) is the domestic fluorine carbon resin is mainly used in the process of synthesis of monomers, the monomer and the tendency is bigger, and copolymerization tend to be small, not easy to get arranged alternately copolymer (ABABBAB...). There is continuous vinyl ester copolymerization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Compared with HDI biurea, HDI trimer and IPDI are used as crosslinking agents, and the coating has many advantages such as high hardness and good light. The gk-570 fluorine resin is formulated by the formula, and separately with the Desmodur. N 75, Desmodur? N 3390 and Desmodur? N 3390 / Z4470 (quality ratio 4:1) 3 crosslinking agents for the paint, N (-nco)/N (-oh), 1.05:1, for performance comparison.
Using N 3390 as the crosslinking agent, the coating performance is the best and the performance is better than N 75. Using N 3390 / Z4470 as the crosslinking agent, the anti-shock performance was reduced, but the performance of artificial acceleration was most prominent.
The reason of the analysis is that because HDI diurea molecules are linear, the film is flexible. And the HDI trimer and IPDI trimer have a ring structure, which is more rigid, especially IPDI trimer, which can obviously improve the coating hardness.
After the causation of alkali (acid) catalysis and ultraviolet radiation, the ammonia-coated ammoniac bonds are decomposed into small molecular products, resulting in degraded performance.
Compared with HDI biuret, HDI trimer and IPDI trimer as crosslinking agent of coating of ammonia ester bond than part of isocyanate crosslinking agent is relatively stable, so in the chemical medium resistance, salt fog resistance and anti ultraviolet ageing performance is more outstanding.
HDI trimer viscosity than HDI biuret low viscosity, high solid content paint construction, reduce the VOC content in the coating, is beneficial to environmental protection, and other performance and HDI biuret.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
IPDI trimer can be used in the construction of short period of time. Because of its hard and crisp, non-impact, flexible and so on, it is usually not used alone, often with HDI system crosslinking agent.
The difference in performance of different type teflon resin. By comparison of the performance of four fluorine resin coatings, it is shown that the different structure of tetrafluororesins directly influences the performance of the coating. From the Angle of chemical structure, it is best to surround the structure of the unit with four fluoroethylene units.
In other words, the tetrafluoroethylene unit should be aligned with the copolymerization unit. Because of the monomer rate, the tetrafluoroethylene/vinyl fluorine resin will not be the graft of ether and ether, the ideal alternate copolymer (ABABAB...). In the molecular link, the less stable vinyl ether fragment is shielded and surrounded by the stable, better tetrafluoroethylene fragments.
In addition, as a result of the fluorine atom electronegativity, with more negative charges, adjacent fluorine atoms repel each other, and make the connection of fluorine atoms on the main chain of the polymer molecules fully extended, the molecular main chain into helical conformation.
The helical conformation of the surface of the molecular structure has more fluorine atoms, high key can C - F key low bond energy of C - C key can be fully protected, give the film high chemical resistance and aging resistance. The gk-570 resins are the type teflon. The tetrafluorotype of our country is mainly tetrafluoroethylene/vinyl ester.
Vinyl acetate (VAc) is the domestic fluorine carbon resin is mainly used in the process of synthesis of monomers, the monomer and the tendency is bigger, and copolymerization tend to be small, not easy to get arranged alternately copolymer (ABABBAB...). There is continuous vinyl ester copolymerization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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