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Powder coating weathering crosslinking agent
2017-3-2 15:14:48
Powder coating weathering crosslinking agent, during 1998 ~ 1999 in Florida exposure test had some bad weather HAA film model (i.e., after one year exposure of the gloss retention rate < 50%), opinions vary, but shortly after, found that the other curing systems including TGIC a similar situation, the example of this phenomenon has nothing to do with the curing system.
Supposedly it may be associated with astronomical change at that time, because the UV radiation during the same period atmosphere unusually high, rainfall also increased greatly. In order to verify, by Dr Jean - LucDallons accelerated aging, such as water immersion test were evaluated.
The accelerated aging test conditions are: 60 ℃ UVA irradiatio
n 4 h. 50 ℃ lon 4 h for a cycle. Water immersion test condition is: temperature 65 ℃, pH is 5, and 7 of the two kinds of water bath respectively.
The conditions of the model is: polyester/TGIC formulas and glycidyl ester system (GES), HAA system for 93/7 to 95/5, curing temperature is 200 ℃ 200 ℃ / min and 10 respectively / 10 min two levels. Model of evaluation based on 600 gloss coating changes. The following is the result of the assessment.
(1) the effect of powder coating processing strength: HAA system of red powder coating using four different conditions of processing, the two samples is low energy single screw extrusion machine, the other two samples are double screw extrusion machine. In 2000 h QUV test and pH5 bath immersion test in no difference between the four types of sample. But in pH7 bath immersion test, the model is much better than that of the single screw extrusion machining twin-screw extrusion machining model.
(2) other factors: HAA adding hydrogenated castor oil to improve the coating curing system and to take off the gas flowing property, the film no matter in the QUV accelerated aging test, pH5 water bath immersion test, or pH7 bath immersion test, gloss coating increases by about 10.
(3) when the HAA curing system of carboxyl polyester were compared for different companies and found that no matter the QUV accelerated aging test, pH5 water bath immersion test, or pH7 bath immersion test, a sample of coating gloss change difference is not big.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
According to the above test can draw the following conclusion: TGIC system difference, with the system of HAA GES system with poor light fastness of red coating, it may be related to the choice of the fillers.
Processing technology of powder coating aging resistance has no apparent influence, but the water resistance has a certain influence. Has decided to influence on ageing resistance and water resistance factor is the coating of the curing conditions. A basic material of chemical curing of ageing resistance and water resistance and no difference.
Based on statistical data, the analysis of the chemical structure and applications of test, that is no matter from theory and practice experience has proved the HAA is a stable and reliable performance is excellent weather resistance of powder coating curing agent, especially commendable, it is an energy efficient and environmentally friendly weather resistance of powder coating curing agent.
In the field of powder coating weather resistance curing agent, after 15 years of the development of HAA already from obscurity to leading role transformation, but in 2003 was a turning point, just believe that future change will be faster. North America is a breakthrough in 2003, HAA curing powder coatings has amounted to 5000 t. Japan is 700 t, 2004 and the year before was only 400 t.
At the same time also need to point out that this article cited figures from foreign companies, it has a certain credibility, but not comprehensive, especially to grasp the situation of China, HAA actual production may be higher.
Compared with 2003, the Chinese HAA growth rate of more than 40% in 2004, and 2005 years ago, the growth rate of a few months more than a year earlier. These Numbers are only catch a glimpse of the world development trend.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Supposedly it may be associated with astronomical change at that time, because the UV radiation during the same period atmosphere unusually high, rainfall also increased greatly. In order to verify, by Dr Jean - LucDallons accelerated aging, such as water immersion test were evaluated.
The accelerated aging test conditions are: 60 ℃ UVA irradiatio
n 4 h. 50 ℃ lon 4 h for a cycle. Water immersion test condition is: temperature 65 ℃, pH is 5, and 7 of the two kinds of water bath respectively.
The conditions of the model is: polyester/TGIC formulas and glycidyl ester system (GES), HAA system for 93/7 to 95/5, curing temperature is 200 ℃ 200 ℃ / min and 10 respectively / 10 min two levels. Model of evaluation based on 600 gloss coating changes. The following is the result of the assessment.
(1) the effect of powder coating processing strength: HAA system of red powder coating using four different conditions of processing, the two samples is low energy single screw extrusion machine, the other two samples are double screw extrusion machine. In 2000 h QUV test and pH5 bath immersion test in no difference between the four types of sample. But in pH7 bath immersion test, the model is much better than that of the single screw extrusion machining twin-screw extrusion machining model.
(2) other factors: HAA adding hydrogenated castor oil to improve the coating curing system and to take off the gas flowing property, the film no matter in the QUV accelerated aging test, pH5 water bath immersion test, or pH7 bath immersion test, gloss coating increases by about 10.
(3) when the HAA curing system of carboxyl polyester were compared for different companies and found that no matter the QUV accelerated aging test, pH5 water bath immersion test, or pH7 bath immersion test, a sample of coating gloss change difference is not big.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
According to the above test can draw the following conclusion: TGIC system difference, with the system of HAA GES system with poor light fastness of red coating, it may be related to the choice of the fillers.
Processing technology of powder coating aging resistance has no apparent influence, but the water resistance has a certain influence. Has decided to influence on ageing resistance and water resistance factor is the coating of the curing conditions. A basic material of chemical curing of ageing resistance and water resistance and no difference.
Based on statistical data, the analysis of the chemical structure and applications of test, that is no matter from theory and practice experience has proved the HAA is a stable and reliable performance is excellent weather resistance of powder coating curing agent, especially commendable, it is an energy efficient and environmentally friendly weather resistance of powder coating curing agent.
In the field of powder coating weather resistance curing agent, after 15 years of the development of HAA already from obscurity to leading role transformation, but in 2003 was a turning point, just believe that future change will be faster. North America is a breakthrough in 2003, HAA curing powder coatings has amounted to 5000 t. Japan is 700 t, 2004 and the year before was only 400 t.
At the same time also need to point out that this article cited figures from foreign companies, it has a certain credibility, but not comprehensive, especially to grasp the situation of China, HAA actual production may be higher.
Compared with 2003, the Chinese HAA growth rate of more than 40% in 2004, and 2005 years ago, the growth rate of a few months more than a year earlier. These Numbers are only catch a glimpse of the world development trend.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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