News Details
Paint crosslinking agent for outdoor powder
2017-5-9 11:15:09
Paint crosslinking agent for outdoor powder. Low toxicity determines the viability of beta-haa in powder applications. Based on its virulence and its impact on the environment, beta-haa is also recognized as a reasonably safe outdoor powder crosslinking agent.
QM - 1260 is the subsequent launch PRIMID crosslinking agent, methyl, introduced on the structure of XL - 552, as a result, the improved gas furnace bake resistance of coating is not easy yellowing, but in general electric heating system not too big difference. PRIMID SF4510 is low sense of crosslinking agent since the crosslinking density to reduce its chemical resistance is not very good, and the yellowing is not completely overcome, so the product has not been a large number of promotion.
The features of beta-haa in practice
(1) the use of the ratio
The following is an example of the usage of beta-haa in the recipe by using the primid-xl552.
Beta HAA industrial products is not a pure compounds, although in theory the hydroxyl equivalent of 80 g/eq respectively, but in fact, as a result of the existence of other impurity content in general to 84 g/eq for practical calculation.
The use of beta-haa in polyester is related to acid price, so the hydroxyequivalent, the acid price, is the key factor in determining the dosage of beta-haa. The formula for the use of beta-haa is as follows:
Beta-haa % = {N * AV / 56.1} / {1000 + N * AV / 56.1}
AV: the acid price of polyester, N for HAA
According to the calculation of theoretical formula, the results can be reasonably satisfactory, and the actual usage should be more than 5% of theoretical calculation. The use of beta-haa is not recommended because it interferes with normal cross-linking and may cause other negative effects, such as yellowing and pinholes.
(2) resin selective problems
In the general powder system, the use accelerator can accelerate the reaction activity, which can greatly improve the efficiency of processing and reduce the temperature of baking. However, for beta-haa, the usual accelerant does not work because the hydroxy and carboxylic reactions in the beta position are only associated with the structure and composition of the polyester. So in this kind of system of fillers, pigments to the influence of the reaction speed is very slight, select the appropriate polyester resin is very necessary, in fact has a number of special resin to choose from.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
We know the beta HAA completely crosslinking can be as low as 150 ℃, the benefits of this feature is in beta HAA reactivity and polyester structure, such as long as selecting the appropriate polyester resin, powder of the reactivity changes should not be affected by other factors.
(3) the effect of humidity on the processing of beta-haa
Beta-haa is easily soluble in water and is also a hydrophilic substance, which tends to form a small amount of condensation. We often find beta HAA through extruder in steel with cooling, if the temperature difference is bigger, will find powder have damp phenomenon, especially in hot summer, humidity, a lot of cases this kind of phenomenon is more obvious, but in winter, especially the north this kind of situation is rare.
Beta HAA or made of beta HAA powder brings negative effect is: after hygroscopic powder due to moisture adsorption on the parts reduces the conductivity, before baking powder affected by prone to part falls off phenomenon.
Therefore, it is more effective to reduce the temperature difference by reducing the humidity in the production environment or using air conditioner. The powder of the pulverized powder has a higher temperature difference because of the environment, so it also causes moisture condensation and the solution.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
QM - 1260 is the subsequent launch PRIMID crosslinking agent, methyl, introduced on the structure of XL - 552, as a result, the improved gas furnace bake resistance of coating is not easy yellowing, but in general electric heating system not too big difference. PRIMID SF4510 is low sense of crosslinking agent since the crosslinking density to reduce its chemical resistance is not very good, and the yellowing is not completely overcome, so the product has not been a large number of promotion.
The features of beta-haa in practice
(1) the use of the ratio
The following is an example of the usage of beta-haa in the recipe by using the primid-xl552.
Beta HAA industrial products is not a pure compounds, although in theory the hydroxyl equivalent of 80 g/eq respectively, but in fact, as a result of the existence of other impurity content in general to 84 g/eq for practical calculation.
The use of beta-haa in polyester is related to acid price, so the hydroxyequivalent, the acid price, is the key factor in determining the dosage of beta-haa. The formula for the use of beta-haa is as follows:
Beta-haa % = {N * AV / 56.1} / {1000 + N * AV / 56.1}
AV: the acid price of polyester, N for HAA
According to the calculation of theoretical formula, the results can be reasonably satisfactory, and the actual usage should be more than 5% of theoretical calculation. The use of beta-haa is not recommended because it interferes with normal cross-linking and may cause other negative effects, such as yellowing and pinholes.
(2) resin selective problems
In the general powder system, the use accelerator can accelerate the reaction activity, which can greatly improve the efficiency of processing and reduce the temperature of baking. However, for beta-haa, the usual accelerant does not work because the hydroxy and carboxylic reactions in the beta position are only associated with the structure and composition of the polyester. So in this kind of system of fillers, pigments to the influence of the reaction speed is very slight, select the appropriate polyester resin is very necessary, in fact has a number of special resin to choose from.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
We know the beta HAA completely crosslinking can be as low as 150 ℃, the benefits of this feature is in beta HAA reactivity and polyester structure, such as long as selecting the appropriate polyester resin, powder of the reactivity changes should not be affected by other factors.
(3) the effect of humidity on the processing of beta-haa
Beta-haa is easily soluble in water and is also a hydrophilic substance, which tends to form a small amount of condensation. We often find beta HAA through extruder in steel with cooling, if the temperature difference is bigger, will find powder have damp phenomenon, especially in hot summer, humidity, a lot of cases this kind of phenomenon is more obvious, but in winter, especially the north this kind of situation is rare.
Beta HAA or made of beta HAA powder brings negative effect is: after hygroscopic powder due to moisture adsorption on the parts reduces the conductivity, before baking powder affected by prone to part falls off phenomenon.
Therefore, it is more effective to reduce the temperature difference by reducing the humidity in the production environment or using air conditioner. The powder of the pulverized powder has a higher temperature difference because of the environment, so it also causes moisture condensation and the solution.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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