News Details
Powder coating crosslinking agent formula
2017-3-19 16:41:53
Powder coating crosslinking agent formula,In powder coating, the coating crosslinked bad reason has two aspects, one is powder coating formula design is unreasonable, coating performance can not meet the requirements, the second is powder coating performance no problem itself, but rather in powder coating, coating process control is not reasonable, causing coating performance failed to achieve technical indicators.
Considering from powder coating, if resin in the formula design and matching of crosslinking agent is unreasonable, such as resin reactivity or varieties and quantities of crosslinking agent selection is not reasonable; Packing quality percentage or volume concentration is too big etc. These problems will affect the physical and mechanical performance of the coating.
Considering from the powder coating process, influence coating crosslinked bad reason has the following several aspects.
1. The baking temperature baking furnace baking temperature of powder coating requirement. While baking furnace temperature control can meet the design temperature or when no load required by the powder coating baking temperature, but the full load cases, caused by a lack of the total quantity of heat, sometimes can not meet the design temperature or powder coating baking temperature as needed.
2. The temperature is low, particularly the northern region winter workshop if baking furnace heat preservation condition is poor, be before coating in baking furnace and lower temperature, by coating materials, wall thickness and thermal capacity is big, it is easier to appear this kind of problem. As the temperature of the baking furnace short of powder coating baking crosslinking temperature, it is easier to appear this kind of problem. When baking furnace temperature reach powder coating baking crosslinking temperature, on the one hand, by increasing the heating power solution; On the other hand can also prolong bake crosslinking and other measures to solve them.
2. In the baking furnace, baking crosslinking time short of baking powder coating requirements. In powder coating baking conditions, baking time refers to the coated material reached after baking temperature calculation of the baking time, not be coated in after baking ovens, began to calculate time. When the coating material thickness, hung with a more, so is the greater the coating of heat capacity, the coated things heat up to the time required to control temperature is long.
3. In a certain length of baking furnace, at constant when the speed of the conveyor chain, effective curing time is short. Effective baking time enough, if incomplete, coating crosslinked coating not physical and mechanical performance requirements. In powder coating, therefore, it is best to furnace temperature tracking apparatus under the condition of full load, the coated content in baking furnace temperature changes, in order to determine reasonable baking crosslinking temperature and time, which ensures that coating crosslinked completely, at the same time also can guarantee the physical and mechanical properties of coating.
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.
3. The coated surface treatment well. On the coated surfaces in the oil not clean, scale or rust is not clean, or phosphating film quality is bad, many in the surface phosphating liquid residue and so on, in this case, after the powder coating of coating and substrate adhesion is bad, cause the film impact resistance performance is not good at the same time. This problem is by improving the coating quality of the surface treatment is to be solved.
4. In terms of coating performance testing, should be strictly in accordance with regulations of the product standard test under the conditions of temperature and coating thickness. In general, the film thickness is thicker than rules; Laboratory temperature than at low temperature, resistance to impact strength of coating adhesion, flexibility, cup drawing test and performance is poor, it is not easy to pass; But thin coating thickness, test temperature than at high temperature, physical and mechanical properties of these would be easy to pass.
If you want to really accurate determination of coating performance, must according to the conditions stipulated in the standard or close to the test conditions is better. From the Angle of guarantee the quality of the products to consider, as far as possible under the condition of a tough test coating performance index, can safely ensure the quality of coating products.
5. Here also want to consider to bake crosslinking temperature is too high, the baking time is too long, because the coating thermal aging makes the coating color change, at the same time coating flexibility, high impact strength and other physical mechanics performance degradation phenomenon. Therefore, roasted crosslinking temperature is too high, time is too long for same physical and mechanical properties of coating film is unfavorable.
In powder coating, powder coating baking crosslinking temperature and time on the physical and mechanical properties of coating play a decisive role. , therefore, must after condition experiments, the classifying by coating reasonably, to determine the number of widgets and arrangement, as well as the corresponding to the baking temperature and time, in order to ensure the quality of coating products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Considering from powder coating, if resin in the formula design and matching of crosslinking agent is unreasonable, such as resin reactivity or varieties and quantities of crosslinking agent selection is not reasonable; Packing quality percentage or volume concentration is too big etc. These problems will affect the physical and mechanical performance of the coating.
Considering from the powder coating process, influence coating crosslinked bad reason has the following several aspects.
1. The baking temperature baking furnace baking temperature of powder coating requirement. While baking furnace temperature control can meet the design temperature or when no load required by the powder coating baking temperature, but the full load cases, caused by a lack of the total quantity of heat, sometimes can not meet the design temperature or powder coating baking temperature as needed.
2. The temperature is low, particularly the northern region winter workshop if baking furnace heat preservation condition is poor, be before coating in baking furnace and lower temperature, by coating materials, wall thickness and thermal capacity is big, it is easier to appear this kind of problem. As the temperature of the baking furnace short of powder coating baking crosslinking temperature, it is easier to appear this kind of problem. When baking furnace temperature reach powder coating baking crosslinking temperature, on the one hand, by increasing the heating power solution; On the other hand can also prolong bake crosslinking and other measures to solve them.
2. In the baking furnace, baking crosslinking time short of baking powder coating requirements. In powder coating baking conditions, baking time refers to the coated material reached after baking temperature calculation of the baking time, not be coated in after baking ovens, began to calculate time. When the coating material thickness, hung with a more, so is the greater the coating of heat capacity, the coated things heat up to the time required to control temperature is long.
3. In a certain length of baking furnace, at constant when the speed of the conveyor chain, effective curing time is short. Effective baking time enough, if incomplete, coating crosslinked coating not physical and mechanical performance requirements. In powder coating, therefore, it is best to furnace temperature tracking apparatus under the condition of full load, the coated content in baking furnace temperature changes, in order to determine reasonable baking crosslinking temperature and time, which ensures that coating crosslinked completely, at the same time also can guarantee the physical and mechanical properties of coating.
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.
3. The coated surface treatment well. On the coated surfaces in the oil not clean, scale or rust is not clean, or phosphating film quality is bad, many in the surface phosphating liquid residue and so on, in this case, after the powder coating of coating and substrate adhesion is bad, cause the film impact resistance performance is not good at the same time. This problem is by improving the coating quality of the surface treatment is to be solved.
4. In terms of coating performance testing, should be strictly in accordance with regulations of the product standard test under the conditions of temperature and coating thickness. In general, the film thickness is thicker than rules; Laboratory temperature than at low temperature, resistance to impact strength of coating adhesion, flexibility, cup drawing test and performance is poor, it is not easy to pass; But thin coating thickness, test temperature than at high temperature, physical and mechanical properties of these would be easy to pass.
If you want to really accurate determination of coating performance, must according to the conditions stipulated in the standard or close to the test conditions is better. From the Angle of guarantee the quality of the products to consider, as far as possible under the condition of a tough test coating performance index, can safely ensure the quality of coating products.
5. Here also want to consider to bake crosslinking temperature is too high, the baking time is too long, because the coating thermal aging makes the coating color change, at the same time coating flexibility, high impact strength and other physical mechanics performance degradation phenomenon. Therefore, roasted crosslinking temperature is too high, time is too long for same physical and mechanical properties of coating film is unfavorable.
In powder coating, powder coating baking crosslinking temperature and time on the physical and mechanical properties of coating play a decisive role. , therefore, must after condition experiments, the classifying by coating reasonably, to determine the number of widgets and arrangement, as well as the corresponding to the baking temperature and time, in order to ensure the quality of coating products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian