News Details
Sealed isocyanate paint crosslinking agent
2017-6-5 16:40:39
Sealed isocyanate paint crosslinking agent
The effect of different types of closed isocyanate on film performance. B1 and B2 were used respectively to two closed isocyanate crosslinking agent, with proper organic tin drier, n (─ NCO)/n (─ OH) = 1:1. The chemical composition of the closed isocyanate B1 is 3, 5-dimethyprazole (DMP), B2 is MEKO, and the film performance test is obtained.
With closed isocyanate B1 as crosslinking agent of paint film comprehensive performance is excellent, in the dry resistance, resistance to chemical media and artificial accelerated aging obviously superior to B2 system. This is because in DMP closed isocyanate is MEKO have lower deblocking temperature (see table 4), it can unlock under 110 ~ 120 ° C, to make it stronger coating the applicability of the formula, can satisfy the coating in crosslinking curing within the wider temperature range.
Studies have shown that DMP, in a closed isocyanate with isocyanate N H form five membered ring connected amino can further promote unsealed reaction intermediates, to speed up the reaction rate, therefore, can be realized in a shorter time coating crosslinked completely. Moreover, 3, 5-dimethyl pyrazazole also has the advantage of less yellowing than oxime.
Due to the closed isocyanate B1 B2 has lower deblocking temperature, under the condition of 140 ° C baking, B1 as crosslinking agent of coating the crosslinking degree of the B2 more completely, so the coating hardness, resistance to chemical media and artificial accelerated aging performance is more outstanding. In addition, the DMP sealants are non-volatile, boiling point is about 218 ° C.
Unlike other sealants, DMP sealants remain mainly in the coating during baking and are later used as inert filler. Therefore, the use of DMP sealant reduces the emissions during the baking process, and the residue is not only inert in the finished coating, but also low toxicity.
The requirements for each performance test are as follows:
(1) gloss, adhesion, pencil hardness, flexibility and impact resistance test are only used for making board and testing of fluorocarbon coating. The base material is made of iron plate, the film thickness is (23 + + 3) mu m, after drying 30 minutes and testing.
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.
(2) MEK (a ethyl ketone) is used to clean the performance test with a composite coating made from fluorocarbon paint and a matching primer. The base material is a horse iron plate, the primer and the surface paint each one, the primer and the surface paint are two baked. The coating thickness is 40 ~ 50 mu m, after drying, place 30 min to test again.
(3) water resistance, acid resistance, alkali resistance, and salt and fog performance testing projects are composite coatings for fluorocarbon coating and corresponding supporting primer. The base material is the steel plate that has been dealt with, the ground lacquer and the surface paint each one, the base lacquer and the face paint are two coating two bake. The coating thickness is 40 ~ 50 mu m, after drying, place 30 min for performance test .
(4) the artificial accelerated aging resistance performance test using only one component system board and fluorocarbon paint and base material is 1.0 mm thick aluminum plate, film thickness is 25 ~ 30 microns.
The above performance is based on HG/T 3792-2005 "crosslinked fluorocarbon coating" and relevant national standards.
Test conditions for artificially accelerating aging performance
(1) irradiance: under normal conditions, the radiation wavelength is 290 ~ 340 nm, and the irradiation is 0.6 W/(m2 / nm).
(2) the environment temperature, temperature control the whole test cycle in 50 ° C.
(3) condensate: the use of common tap water.
(4) rainfall: 4 h / 4 h for the period of rainfall (i.e., "rain time/no rainfall time").
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The effect of different types of closed isocyanate on film performance. B1 and B2 were used respectively to two closed isocyanate crosslinking agent, with proper organic tin drier, n (─ NCO)/n (─ OH) = 1:1. The chemical composition of the closed isocyanate B1 is 3, 5-dimethyprazole (DMP), B2 is MEKO, and the film performance test is obtained.
With closed isocyanate B1 as crosslinking agent of paint film comprehensive performance is excellent, in the dry resistance, resistance to chemical media and artificial accelerated aging obviously superior to B2 system. This is because in DMP closed isocyanate is MEKO have lower deblocking temperature (see table 4), it can unlock under 110 ~ 120 ° C, to make it stronger coating the applicability of the formula, can satisfy the coating in crosslinking curing within the wider temperature range.
Studies have shown that DMP, in a closed isocyanate with isocyanate N H form five membered ring connected amino can further promote unsealed reaction intermediates, to speed up the reaction rate, therefore, can be realized in a shorter time coating crosslinked completely. Moreover, 3, 5-dimethyl pyrazazole also has the advantage of less yellowing than oxime.
Due to the closed isocyanate B1 B2 has lower deblocking temperature, under the condition of 140 ° C baking, B1 as crosslinking agent of coating the crosslinking degree of the B2 more completely, so the coating hardness, resistance to chemical media and artificial accelerated aging performance is more outstanding. In addition, the DMP sealants are non-volatile, boiling point is about 218 ° C.
Unlike other sealants, DMP sealants remain mainly in the coating during baking and are later used as inert filler. Therefore, the use of DMP sealant reduces the emissions during the baking process, and the residue is not only inert in the finished coating, but also low toxicity.
The requirements for each performance test are as follows:
(1) gloss, adhesion, pencil hardness, flexibility and impact resistance test are only used for making board and testing of fluorocarbon coating. The base material is made of iron plate, the film thickness is (23 + + 3) mu m, after drying 30 minutes and testing.
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.
(2) MEK (a ethyl ketone) is used to clean the performance test with a composite coating made from fluorocarbon paint and a matching primer. The base material is a horse iron plate, the primer and the surface paint each one, the primer and the surface paint are two baked. The coating thickness is 40 ~ 50 mu m, after drying, place 30 min to test again.
(3) water resistance, acid resistance, alkali resistance, and salt and fog performance testing projects are composite coatings for fluorocarbon coating and corresponding supporting primer. The base material is the steel plate that has been dealt with, the ground lacquer and the surface paint each one, the base lacquer and the face paint are two coating two bake. The coating thickness is 40 ~ 50 mu m, after drying, place 30 min for performance test .
(4) the artificial accelerated aging resistance performance test using only one component system board and fluorocarbon paint and base material is 1.0 mm thick aluminum plate, film thickness is 25 ~ 30 microns.
The above performance is based on HG/T 3792-2005 "crosslinked fluorocarbon coating" and relevant national standards.
Test conditions for artificially accelerating aging performance
(1) irradiance: under normal conditions, the radiation wavelength is 290 ~ 340 nm, and the irradiation is 0.6 W/(m2 / nm).
(2) the environment temperature, temperature control the whole test cycle in 50 ° C.
(3) condensate: the use of common tap water.
(4) rainfall: 4 h / 4 h for the period of rainfall (i.e., "rain time/no rainfall time").
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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