News Details
Fluorocarbon resin coating permanent temperature crosslinking agent
2017-5-10 15:43:51
Fluorocarbon resin coating permanent temperature crosslinking agent. With the rapid development of modern industry, large steel structure, Marine facilities, ocean shipping, and high-rise buildings of the anticorrosive coating, weatherability and durability put forward higher requirements.
By the crosslinking of FEVE resin was prepared at room temperature fluorocarbon resin coating, has a superior weather resistance, corrosion resistance, excellent chemical resistance and good washing resistance, contamination resistance, and the characteristics of convenient construction, and is widely applied in the field of heavy-duty.
Fluorine resin coating application development, however, has been a hotspot of research on high performance coatings, low temperature crosslinking or solvent soluble fluorine resin coating also represents the development direction of fluorine resin coating.
The experimental materials. F100 fluorine resin.
Isocyanate crosslinking agent: the diurea N75, hd-90 trimer, silicon modified fatty polyurethane crosslinking agent 3 #.
Fluorine resin coating of excellent performance from the molecular structure of F atoms, atomic electronegativity high F (4.0), small atomic radius (0.135 nm), C - F key extremely short, keys can be as high as 485 kj/mol, so the stability of molecular structure. In its molecule, every C - C key surrounded by a spiral three-dimensional columns of fluorine atoms tightly, thus can protect it from ultraviolet (uv) light, heat, or other media. Because of its very low oxygen penetration, it is very good to prevent corrosion of the substrate.
FEVE resins are based on monomers such as trifluorochloroethylene, and are made by copolymerization with functional functional groups such as vinyl ether or vinyl. In FEVE resin, three structure units of fluoride vinyl chloride, vinyl ether and fluorine olefin unit alternate connection, decided the coating excellent weather resistance and chemical resistance. Side chains on the hydroxyl can react with isocyanate - NCO functional groups, gradually formed a mesh polymer compound, on the side chain of carboxyl help wet dispersion of pigment.
Cross-linking agent performance comparison. The normal temperature crosslinking type fluorocarbon resin coating USES N75 as the crosslinking agent. The HDI trimer, which has been developing in recent years, has the following advantages:
(1) HDI trimer, because of the inability to form hydrogen bonds between molecules, is less viscous than N75, which is conducive to the construction of less solvents and easier to produce high solid content.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
(2) the protection of HDI trimer is superior to biurea.
The hardness of the coating is slightly higher.
Compare the compatibility of the three crosslinking agents with fluorocarbon resin: hd-90 > crosslinking agent 3 # > N75.
The effect of crosslinking agent type on coating performance: hd-90 crosslinked fluorine resin coating is the best mechanical properties, and N75 crosslinked fluororesin coatings are secondary to mechanical properties. Hd-90 has the fastest drying speed, high hardness and good appearance; The fluorine resin coating of the crosslinking agent 3 # is high, the appearance and fullness are good, but the impact performance has been decreased.
The effect of crosslinking agent on the resistance of dielectric properties: the use of the hd-90 crosslinking agent, the resistance of the coating to the alkali resistance and the water resistance of the coating has been greatly improved. There is not much difference between the matching salt mist and the air medium soak performance of the three crosslinking agents. In addition to the characteristics of the crosslinking agent, the compatibility of fluorocarbon resin and crosslinking agent has some effect on the coating properties.
In addition, the appropriate ratio of NCO/OH has a significant impact on mechanical performance and performance. It is shown that fluorocarbon coating has excellent anticorrosive properties, and it greatly improves the corrosion resistance of fluorocarbon coating after using the hd-90 crosslinking agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
By the crosslinking of FEVE resin was prepared at room temperature fluorocarbon resin coating, has a superior weather resistance, corrosion resistance, excellent chemical resistance and good washing resistance, contamination resistance, and the characteristics of convenient construction, and is widely applied in the field of heavy-duty.
Fluorine resin coating application development, however, has been a hotspot of research on high performance coatings, low temperature crosslinking or solvent soluble fluorine resin coating also represents the development direction of fluorine resin coating.
The experimental materials. F100 fluorine resin.
Isocyanate crosslinking agent: the diurea N75, hd-90 trimer, silicon modified fatty polyurethane crosslinking agent 3 #.
Fluorine resin coating of excellent performance from the molecular structure of F atoms, atomic electronegativity high F (4.0), small atomic radius (0.135 nm), C - F key extremely short, keys can be as high as 485 kj/mol, so the stability of molecular structure. In its molecule, every C - C key surrounded by a spiral three-dimensional columns of fluorine atoms tightly, thus can protect it from ultraviolet (uv) light, heat, or other media. Because of its very low oxygen penetration, it is very good to prevent corrosion of the substrate.
FEVE resins are based on monomers such as trifluorochloroethylene, and are made by copolymerization with functional functional groups such as vinyl ether or vinyl. In FEVE resin, three structure units of fluoride vinyl chloride, vinyl ether and fluorine olefin unit alternate connection, decided the coating excellent weather resistance and chemical resistance. Side chains on the hydroxyl can react with isocyanate - NCO functional groups, gradually formed a mesh polymer compound, on the side chain of carboxyl help wet dispersion of pigment.
Cross-linking agent performance comparison. The normal temperature crosslinking type fluorocarbon resin coating USES N75 as the crosslinking agent. The HDI trimer, which has been developing in recent years, has the following advantages:
(1) HDI trimer, because of the inability to form hydrogen bonds between molecules, is less viscous than N75, which is conducive to the construction of less solvents and easier to produce high solid content.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
(2) the protection of HDI trimer is superior to biurea.
The hardness of the coating is slightly higher.
Compare the compatibility of the three crosslinking agents with fluorocarbon resin: hd-90 > crosslinking agent 3 # > N75.
The effect of crosslinking agent type on coating performance: hd-90 crosslinked fluorine resin coating is the best mechanical properties, and N75 crosslinked fluororesin coatings are secondary to mechanical properties. Hd-90 has the fastest drying speed, high hardness and good appearance; The fluorine resin coating of the crosslinking agent 3 # is high, the appearance and fullness are good, but the impact performance has been decreased.
The effect of crosslinking agent on the resistance of dielectric properties: the use of the hd-90 crosslinking agent, the resistance of the coating to the alkali resistance and the water resistance of the coating has been greatly improved. There is not much difference between the matching salt mist and the air medium soak performance of the three crosslinking agents. In addition to the characteristics of the crosslinking agent, the compatibility of fluorocarbon resin and crosslinking agent has some effect on the coating properties.
In addition, the appropriate ratio of NCO/OH has a significant impact on mechanical performance and performance. It is shown that fluorocarbon coating has excellent anticorrosive properties, and it greatly improves the corrosion resistance of fluorocarbon coating after using the hd-90 crosslinking agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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