News Details
Weather-resistant powder coating crosslinking agent
2017-8-16 11:41:52
Weather-resistant powder coating crosslinking agent is one of the most active and the most studied areas. The coating systems we normally discuss are classified according to the type of crosslinking agent for weather-resistant powder coatings.
So far, the most mature weather-resistant powder coating crosslinking agent is the TGIC system of isocyanuric acid triglyceride (TGIC). It is well known that three epoxy functional groups in the TGIC molecular structure provide sufficient activity, while the stable triazine ring structure ensures good heat resistance and weathering energy. The system can regulate its reaction activity through different accelerators. Therefore, it can meet various application requirements such as high-light, low light, texture, super resistance and high temperature crosslinking.
In addition, it has always been favored by the market in addition to its stable, easy to melt formation system, stable formulation, adjustable and unaccompanied product release. However, further studies have shown that TGIC strong excitant and potential carcinogenicity, make countries gradually limiting the use of TGIC and Europe as early as 1998 issued toxicity notation to limit its use, from now on, on a global scale the rise of TGIC alternative product development.
In numerous TGIC alternative development achievement, the typical application (there are) are mainly hydroxyl alkyl amide (HAA) and glycidyl ester of polybasic acid crosslinking agent (PT910), three different melamine urea acid - beta - methyl glycidyl ester (MT239), liquid, aliphatic epoxy ethane compounds (Uranox); Polyacrylate (GMA resin); Hydroxyl polyesters/enclosed isocyanates (PU), hydroxyl polyesters/Glycoluril etc. Various alternatives are used for the performance of powder coatings.
TGIC has the most balanced performance in addition to toxicity. And HAA except for small molecules escape (pinhole) lead to film the most serious, the rest of the performance is the most balanced, plus the cost is moderate, easy industrialization, etc, therefore, it is in numerous TGIC alternatives, the most acceptable for market.
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
So far, the most mature weather-resistant powder coating crosslinking agent is the TGIC system of isocyanuric acid triglyceride (TGIC). It is well known that three epoxy functional groups in the TGIC molecular structure provide sufficient activity, while the stable triazine ring structure ensures good heat resistance and weathering energy. The system can regulate its reaction activity through different accelerators. Therefore, it can meet various application requirements such as high-light, low light, texture, super resistance and high temperature crosslinking.
In addition, it has always been favored by the market in addition to its stable, easy to melt formation system, stable formulation, adjustable and unaccompanied product release. However, further studies have shown that TGIC strong excitant and potential carcinogenicity, make countries gradually limiting the use of TGIC and Europe as early as 1998 issued toxicity notation to limit its use, from now on, on a global scale the rise of TGIC alternative product development.
In numerous TGIC alternative development achievement, the typical application (there are) are mainly hydroxyl alkyl amide (HAA) and glycidyl ester of polybasic acid crosslinking agent (PT910), three different melamine urea acid - beta - methyl glycidyl ester (MT239), liquid, aliphatic epoxy ethane compounds (Uranox); Polyacrylate (GMA resin); Hydroxyl polyesters/enclosed isocyanates (PU), hydroxyl polyesters/Glycoluril etc. Various alternatives are used for the performance of powder coatings.
TGIC has the most balanced performance in addition to toxicity. And HAA except for small molecules escape (pinhole) lead to film the most serious, the rest of the performance is the most balanced, plus the cost is moderate, easy industrialization, etc, therefore, it is in numerous TGIC alternatives, the most acceptable for market.
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
Antioxidants are substances that inhibit or delay the degradation of the polymer and are often used to prevent yellowing of the coating during baking. Antioxidant variety many, the effect also is not the same, according to its antioxidant mechanism can be divided into two categories, one kind is chain termination type antioxidants, such antioxidants in polymer and produce free radicals reaction interrupt the growth of the chain, also known as antioxidant, another kind is preventive antioxidant, the antioxidant can inhibit or slow down cause the formation of free radicals in the process, also known as auxiliary antioxidants. The main antioxidant has been hindered by phenols, zhongfang amine and prophylactic antioxidant, such as phosphatate, dithiocarbamate, metal salts, etc.
In the main antioxidant, the phenol antioxidant has a good thermal aging performance and is not easy to yellow. It is often used in hot baking formulations such as IRGANOX in HAA and other light-colored systems. 1010, IRGANOX? 1076, IRGANOX? 245, etc. But the study found that they had obvious red "pinking" in the presence of NOx, so they could not be used for roasting in a gas stove.
Amine antioxygenation agent itself has a yellow tendency, generally not used in light color system. Prophylactic antioxidants generally have good resistance to yellowing and can be used in HAA systems, such as IRGASFOS, an antioxidant. 126, etc.
Different types or structures of antioxidants can be used to achieve better anti-oxidative yellowing effects (synergistic effects), such as phenol/subphosphate mixture IRGANOX? B 225 has better anti-oxidative yellowing effects than using one of the components alone.
Consider from the Angle of saving the cost of crosslinking, users increasingly tend to use gas furnace baking powder, and occurring in the process of NOx exhaust gas type in baking coating causes more severe oxidation action such as yellowing, although some antioxidant system of hot baking yellowing oxide has good inhibition effect, but the inhibition of gas baking yellowing effect is not obvious. So you must use a special antioxidants, such as more aromatic ring lactone class antioxidant HP - 136, yellowing of heat aging and gas baking yellowing all has the very good inhibitory effect, allegedly, if its with phosphite ester antioxidant, effect is better.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Antioxidants are substances that inhibit or delay the degradation of the polymer and are often used to prevent yellowing of the coating during baking. Antioxidant variety many, the effect also is not the same, according to its antioxidant mechanism can be divided into two categories, one kind is chain termination type antioxidants, such antioxidants in polymer and produce free radicals reaction interrupt the growth of the chain, also known as antioxidant, another kind is preventive antioxidant, the antioxidant can inhibit or slow down cause the formation of free radicals in the process, also known as auxiliary antioxidants. The main antioxidant has been hindered by phenols, zhongfang amine and prophylactic antioxidant, such as phosphatate, dithiocarbamate, metal salts, etc.
In the main antioxidant, the phenol antioxidant has a good thermal aging performance and is not easy to yellow. It is often used in hot baking formulations such as IRGANOX in HAA and other light-colored systems. 1010, IRGANOX? 1076, IRGANOX? 245, etc. But the study found that they had obvious red "pinking" in the presence of NOx, so they could not be used for roasting in a gas stove.
Amine antioxygenation agent itself has a yellow tendency, generally not used in light color system. Prophylactic antioxidants generally have good resistance to yellowing and can be used in HAA systems, such as IRGASFOS, an antioxidant. 126, etc.
Different types or structures of antioxidants can be used to achieve better anti-oxidative yellowing effects (synergistic effects), such as phenol/subphosphate mixture IRGANOX? B 225 has better anti-oxidative yellowing effects than using one of the components alone.
Consider from the Angle of saving the cost of crosslinking, users increasingly tend to use gas furnace baking powder, and occurring in the process of NOx exhaust gas type in baking coating causes more severe oxidation action such as yellowing, although some antioxidant system of hot baking yellowing oxide has good inhibition effect, but the inhibition of gas baking yellowing effect is not obvious. So you must use a special antioxidants, such as more aromatic ring lactone class antioxidant HP - 136, yellowing of heat aging and gas baking yellowing all has the very good inhibitory effect, allegedly, if its with phosphite ester antioxidant, effect is better.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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