News Details
Aluminium alloy coating crosslinking agent
2017-7-3 23:23:49
Aluminium alloy coating crosslinking agent
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
From the coating to the future development of weathering is one of the important performance index, aluminum alloy construction profiles but due to the use of environment, regional differences, can use different standards, thus, the selection of coating to be targeted.
The polymer with acrylic acid and its esters has high weatherability, which is mainly determined by monomer. It is formed by polymerization and has a strong stability of light. If the monomer is chosen properly, the coating will be excellent optically. This kind of resin is much better than the polymer formed by condensation.
As such must also have excellent corrosion resistance of coatings, the key to form the crosslinked film, adopting liujia oxygen methyl three melamine as cross-linking agent, in the process of curing film has good crosslinking, make coating has high hardness, gloss, color (yellow) and excellent weatherability.
In recent years, better light fastness of the emergence of cathodic electrodeposition coatings is also a good choice, its corrosion resistance is better, it is polyethylene polyamine resin structure, with IPDI (isophorone isocyanate) or aliphatic isocyanate crosslinking agent, has excellent weather resistance, can be made into CED.
Use CED, without using aluminum oxide, because in the process of electrodeposition, behavior toward the cathode electrophoresis, oxidation film can all or part of damage to damage, but still this coating have excellent corrosion resistant agent and weatherability, there are a lot of people think it should be a development trend in the field of architecture.
About coating process, adopt the method of electrodeposition method is the most ideal, favorable production automation, high efficiency and the utilization rate of coating is as high as 95% (the production of aluminum anode electrophoresis paint is 82% commonly, efficiency mainly related to the viscosity of the coating solution and anti-jamming ability), production coating quality the most stable, is through the ED form of film.
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
Its process is under the action of electric field force, first of all in the position with high current density, coating, formed after the membrane resistance, without the formation of adjacent areas and become the position with high current density flow, thus continue to coating, high resistance of parts of each part are formed, and then extend ED coating will no longer be thickening time, for each part of the geometry of complex profile can get a uniform film thickness of film, called ED HFM can swim, and excellent corrosion resistance, as well as improve the weatherability.
The insulation of the coating depends not only on the thickness of the coating, but also on the porosity of the coating itself. Coating porosity in the very great degree has been adopted by the method and application conditions, because the formation of voids in the coating depends basically mold cavity surface contact carrier and the evaporation rate of water, the most commonly used method is the application of spraying mould coating, but sometimes brush painting, as in the gating system and take in the estuary.
At about 170 ° to 200 ° for spraying, often can get the best coating effect, but the viscosity of coating and spraying equipment have an effect on the quality of the coating sediments, therefore, depending on the viscosity of coating and spraying equipment, sometimes it's necessary to spray a little on the high side is the best temperature.
Mold coating at high temperature, coating carrier between water and high temperature can reflect the strong, can usually get a lot of coating porosity, coating of heat insulation performance will be better, but because of too high mold temperature will cause strong "rebound", it is difficult to make coating adhesion on the cavity surface, the coating adhesion of mould and will reduce the service life.
On the contrary, while the coating has a higher life span, the coating is more compact and less adiabatic, and too low spray temperature can cause the coating to be uneven and patched. When the mold is heated to the working temperature, it will produce the coating cracking and peeling defects, and the moisture absorbed in the coating will also crack the adhesive membrane when it evaporates at high temperature.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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