Application of low temperature curing agent of organic urea in powder coating

Whether it is thermoplastic or thermosetting powder coating, it is generally required to bake for 20min above 180 ℃ Due to the high curing temperature, its application is limited to heat-resistant base materials such as metal, but it can not be applied to the surface coating of heat-sensitive base materials such as wood, MDF, etc High curing temperature also increases energy consumption Every 10 ℃ reduction of curing temperature can save about 10% of coating energy The long curing time also leads to a large area of continuous production line and increases the retention time of products in the baking room, which is unfavorable to production cost and production efficiency Therefore, the study of low temperature curing and rapid curing of powder coatings has important economic and social benefits A kind of organic urea curing agent (toluene-2,4-di [nn-dimethylaminopropionamide]) for epoxy powder coating was synthesized, and the production process of epoxy powder coating was improved to realize rapid curing at low temperature At the same time, the amount of curing agent, the physical and mechanical properties and the chemical resistance of the composite epoxy powder coating were studied A kind of low temperature curing agent (toluene-2,4-bis [n, n-dimethylaminopropionamide]) suitable for epoxy powder coating was synthesized, and the production process of the powder coating was improved, so that the epoxy powder coating could be cured completely at low temperature and in a short time
Using organic urea compound as curing agent of epoxy powder coating, the fixed curing agent dosage is 9%, adopting the improved process to produce powder coating, can make epoxy powder coating fully solidified under the curing conditions of 130 ℃, 9min and 140 ℃, 4min, can greatly reduce the curing temperature while meeting the physical and Mechanical properties and chemical resistance of the coating film, and has obvious energy saving effect It can meet the requirements of industrial production
The synthesis of low temperature curing epoxy powder coating makes the application of powder coating not only limited to the surface coating of heat-resistant base materials such as metal, but also makes it possible for powder coating to be applied to the surface coating of heat-sensitive base materials such as plastic products, paper, paperboard and wood, and finally realizes the specialization of wood powder coating, so as to replace the dominant VOC in wood furniture industry As a result, the application field and application range of powder coating are greatly expanded.