News Details
Hydroxyl alkyl amide coating cross-linking agent
2017-3-1 17:32:01
Hydroxyl alkyl amide coating cross-linking agent, hydroxyl alkyl amide (HAA, T105) curing the reliability of the polyester film.
(especially long since been used to the person who had TGIC) are often on the basis of TGIC. Look at the emergence of new curing agent, the other seems to be contrary to TGIC performance is bad, and even some wrong conclusions. For example they HAA curing of carboxyl polyester TGIC system, it is difficult to get beautiful and conform to the requirements of the performance of coating, accusing HAA problems.
HAA activation energy is far lower than the TGIC, actually need to choose low activity, low curing temperature, low glass transition temperature and low melt viscosity of carboxyl polyester, namely must use special carboxyl polyester with HAA compatibility. Currently existing in the world, including the DSM, UCB, 14 companies; Home also has in hangzhou, zhejiang days companies such as pine, anhui excalibur with dozens of products dedicated to HAA curing system, and thus is a great choice.
HAA system in most of the performance is not worse than TGIC system, some performance even better than TGIC system (see table 2).
In addition to a (molecular weight) without contrast, two kinds of curing system of six (appearance, coating apparent, impact resistance, weather resistance, resistance to hot and humid and salt fog) performance index is quite, six indicators (functionality, dosage, toxicity and storage stability, price, powder coating curing conditions) HAA leading system, only the three indicators (melting point, coating thickness and the largest yellow degeneration) TGIC system have the advantage.
High melting point is shortcomings, but it can be improved through proper melt extrusion temperature and solved. HAA the real problem is structural, that is, when it has moisture with carboxyl polyester curing reaction.
HAA system has two main disadvantages of film (yellow, thick coating) are the resulting, for the reliability of the coating and the resulting debate. Due to curing with water can't is indisputable fact that, as far as possible in order to get rid of too much water use benzoin coating is the root cause of the yellowing.
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
But most of the time just from the mechanism analysis of hydroxyl alkyl amide chemistry or a water generated by its curing such as one-sided speculation, it concluded that poor acid wet resistance is unconvincing.
In fact has been made, in general the volatiles in the process of powder paint baking total could reach 1.5% ~ 6% (see table 3). HAA powder curing system when the moisture for the only 0.4% ~ 0.4% (0.26% ~ 0.26% of total amount of powder), made of polyester powder coatings volatiles increased only 10%. So it may produce some more pores, but will not happen such as imagined, good corrosion resistance, salt fog resistance of the poor and the consequences of poor resistance to hydrolysis.
Yellow degeneration is, indeed, HAA weaknesses, as previously mentioned it is caused by benzoin defoaming agent. Reduce the melt viscosity of the resin, reduce the dosage of benzoin or use alternative measures are quite effective. However, after careful analysis we can see that the so-called yellow degeneration is coating baking sex, i.e. coating curing stand at the high temperature baking.
But HAA powder at 150 ℃ / 30 min can be cured completely, in the industrial production for 20 min, 180 ℃ / 165 ℃ / 10 min has been completely satisfy its curing conditions, general baking equipment (or lines) of the temperature error is 10%, even if the error of 20% will not exceed 220 ℃. So the requirement of > 220 ℃, in fact, is still in accordance with the thinking formulary of TGIC in operation, it does not apply to hydroxyl alkyl amide powder.
In other words, in accordance with the curing condition of HAA to cure, or in accordance with its curing conditions for the design of the equipment and pipeline, it is impossible to appear the so-called yellow degeneration. However should be admitted that under the condition of gas heating, HAA system's resistance to yellow degeneration is poorer, EMS company in recent years introduced PrimidQM1260, ningbo modified products such as the south China sea also launched T105M to solve this problem.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
(especially long since been used to the person who had TGIC) are often on the basis of TGIC. Look at the emergence of new curing agent, the other seems to be contrary to TGIC performance is bad, and even some wrong conclusions. For example they HAA curing of carboxyl polyester TGIC system, it is difficult to get beautiful and conform to the requirements of the performance of coating, accusing HAA problems.
HAA activation energy is far lower than the TGIC, actually need to choose low activity, low curing temperature, low glass transition temperature and low melt viscosity of carboxyl polyester, namely must use special carboxyl polyester with HAA compatibility. Currently existing in the world, including the DSM, UCB, 14 companies; Home also has in hangzhou, zhejiang days companies such as pine, anhui excalibur with dozens of products dedicated to HAA curing system, and thus is a great choice.
HAA system in most of the performance is not worse than TGIC system, some performance even better than TGIC system (see table 2).
In addition to a (molecular weight) without contrast, two kinds of curing system of six (appearance, coating apparent, impact resistance, weather resistance, resistance to hot and humid and salt fog) performance index is quite, six indicators (functionality, dosage, toxicity and storage stability, price, powder coating curing conditions) HAA leading system, only the three indicators (melting point, coating thickness and the largest yellow degeneration) TGIC system have the advantage.
High melting point is shortcomings, but it can be improved through proper melt extrusion temperature and solved. HAA the real problem is structural, that is, when it has moisture with carboxyl polyester curing reaction.
HAA system has two main disadvantages of film (yellow, thick coating) are the resulting, for the reliability of the coating and the resulting debate. Due to curing with water can't is indisputable fact that, as far as possible in order to get rid of too much water use benzoin coating is the root cause of the yellowing.
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
But most of the time just from the mechanism analysis of hydroxyl alkyl amide chemistry or a water generated by its curing such as one-sided speculation, it concluded that poor acid wet resistance is unconvincing.
In fact has been made, in general the volatiles in the process of powder paint baking total could reach 1.5% ~ 6% (see table 3). HAA powder curing system when the moisture for the only 0.4% ~ 0.4% (0.26% ~ 0.26% of total amount of powder), made of polyester powder coatings volatiles increased only 10%. So it may produce some more pores, but will not happen such as imagined, good corrosion resistance, salt fog resistance of the poor and the consequences of poor resistance to hydrolysis.
Yellow degeneration is, indeed, HAA weaknesses, as previously mentioned it is caused by benzoin defoaming agent. Reduce the melt viscosity of the resin, reduce the dosage of benzoin or use alternative measures are quite effective. However, after careful analysis we can see that the so-called yellow degeneration is coating baking sex, i.e. coating curing stand at the high temperature baking.
But HAA powder at 150 ℃ / 30 min can be cured completely, in the industrial production for 20 min, 180 ℃ / 165 ℃ / 10 min has been completely satisfy its curing conditions, general baking equipment (or lines) of the temperature error is 10%, even if the error of 20% will not exceed 220 ℃. So the requirement of > 220 ℃, in fact, is still in accordance with the thinking formulary of TGIC in operation, it does not apply to hydroxyl alkyl amide powder.
In other words, in accordance with the curing condition of HAA to cure, or in accordance with its curing conditions for the design of the equipment and pipeline, it is impossible to appear the so-called yellow degeneration. However should be admitted that under the condition of gas heating, HAA system's resistance to yellow degeneration is poorer, EMS company in recent years introduced PrimidQM1260, ningbo modified products such as the south China sea also launched T105M to solve this problem.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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