News Details
The effect of the coating crosslinking accelerator on the properties of resin
2017-5-6 11:51:05
The effect of the coating crosslinking accelerator on the properties of resin.Crosslinking accelerator can change the crosslinking rate of resins and crosslinking agents, and it is often necessary to join the crosslinking accelerator when synthesizing TGIC's end carboxylic polyester resin. Due to the polyester resin for end carboxyl polyester resin, crosslinking agent used TGIC for compounds containing epoxy groups, can promote the epoxy groups and carboxyl reaction has a variety of crosslinking promoter, mainly imidazoles, imidazoline, ammonium salt, phosphate salt etc.
The use of crosslinking accelerator can accelerate the reaction activity, which can greatly improve the efficiency of processing and reduce the temperature and time of baking. The addition of crosslink accelerator can also indirectly improve the crosslinking density and mechanical strength of the coating.
For beta hydroxy alkyl amide, however, the reaction of hydroxyl and carboxyl polycondensation reaction, so the reactions associated with the structure and composition of polyester, usually used TGIC crosslinking promoter on its doesn't work, can reduce polyester resin instead after China's entry into wto and the crosslinking rate of beta hydroxy alkyl amide.
Because in the case of without additives, polyester resin and crosslinking agent of beta hydroxy alkyl amide reaction rate is fast enough, and as the end carboxyl polyester resin of beta hydroxy alkyl amide crosslinking mechanism and different: TGIC TGIC type mainly epoxy groups and end carboxyl of TGIC polyester resin addition reaction of carboxyl, did not produce by-products.
The hydroxy beta hydroxy alkyl amide and end carboxyl polyester carboxyl polycondensation, produce water molecules, so if the crosslinking rate is too fast and reactivity difference is bigger, coating has been part of the crosslinking, may lead to reaction in heating concentration of water molecules into water vapor removal, easy to produce pinhole on the coating.
And if the crosslink rate is more moderate, the melt coating is less sticky, and the water that is produced early in the reaction can be easily removed, which can improve the thickness of the thick film pinhole. In practice, some additives can be added to delay the reaction rate of resins and crosslinking agents.
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.
In order to further improve the activity of the system, it is necessary to increase the polycondensation reaction of hydroxyl and carboxyl crosslinking promoter, crosslinking temperature can be reduced to 150 ℃ or less, the research work is under way.
The synthesis is a carboxylic ester resin, which is ultimately an acid overdose. But if one-time all formula of material in reaction kettle and the viscosity of the resin, relative molecular mass distribution width, make look bad after powder coating, impact resistance is poor. If the initial input material for excess alcohol, synthetic end hydroxyl polyester resin after first, then add part polybasic acid, then get the resin molecular weight distribution is narrow, characterized by lower viscosity, in addition with the crosslinking agent crosslinking reaction rate is more appropriate, the final coating with good performance.
Research on powder coating preparation. The preparation of powder coatings used the traditional melt extrusion method, the solid material after weighing the premixed, extruder melt extrusion, cooling, crushing, fine crushing, grading sieve powder coating product.
In the process of making powder, the additives can also be added to improve the thickness of the thickness of the thick film. The temperature of the other diplomatic link also influences the performance of the coating. The higher the temperature, the shorter the response time.
In terms of coating aging, in addition to the sun's ultraviolet light, must also consider the water vapor transmittance, due to the structure of isophthalic acid restricted the molecular motion, so the water vapor transmittance of benzenoid polyester film significantly higher than that of benzenoid between polyester film, so isophthalic acid has good weatherability. The effect of different monomers on the coating resistance is considered when designing the formulation of the resistant polyester resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The use of crosslinking accelerator can accelerate the reaction activity, which can greatly improve the efficiency of processing and reduce the temperature and time of baking. The addition of crosslink accelerator can also indirectly improve the crosslinking density and mechanical strength of the coating.
For beta hydroxy alkyl amide, however, the reaction of hydroxyl and carboxyl polycondensation reaction, so the reactions associated with the structure and composition of polyester, usually used TGIC crosslinking promoter on its doesn't work, can reduce polyester resin instead after China's entry into wto and the crosslinking rate of beta hydroxy alkyl amide.
Because in the case of without additives, polyester resin and crosslinking agent of beta hydroxy alkyl amide reaction rate is fast enough, and as the end carboxyl polyester resin of beta hydroxy alkyl amide crosslinking mechanism and different: TGIC TGIC type mainly epoxy groups and end carboxyl of TGIC polyester resin addition reaction of carboxyl, did not produce by-products.
The hydroxy beta hydroxy alkyl amide and end carboxyl polyester carboxyl polycondensation, produce water molecules, so if the crosslinking rate is too fast and reactivity difference is bigger, coating has been part of the crosslinking, may lead to reaction in heating concentration of water molecules into water vapor removal, easy to produce pinhole on the coating.
And if the crosslink rate is more moderate, the melt coating is less sticky, and the water that is produced early in the reaction can be easily removed, which can improve the thickness of the thick film pinhole. In practice, some additives can be added to delay the reaction rate of resins and crosslinking agents.
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.
In order to further improve the activity of the system, it is necessary to increase the polycondensation reaction of hydroxyl and carboxyl crosslinking promoter, crosslinking temperature can be reduced to 150 ℃ or less, the research work is under way.
The synthesis is a carboxylic ester resin, which is ultimately an acid overdose. But if one-time all formula of material in reaction kettle and the viscosity of the resin, relative molecular mass distribution width, make look bad after powder coating, impact resistance is poor. If the initial input material for excess alcohol, synthetic end hydroxyl polyester resin after first, then add part polybasic acid, then get the resin molecular weight distribution is narrow, characterized by lower viscosity, in addition with the crosslinking agent crosslinking reaction rate is more appropriate, the final coating with good performance.
Research on powder coating preparation. The preparation of powder coatings used the traditional melt extrusion method, the solid material after weighing the premixed, extruder melt extrusion, cooling, crushing, fine crushing, grading sieve powder coating product.
In the process of making powder, the additives can also be added to improve the thickness of the thickness of the thick film. The temperature of the other diplomatic link also influences the performance of the coating. The higher the temperature, the shorter the response time.
In terms of coating aging, in addition to the sun's ultraviolet light, must also consider the water vapor transmittance, due to the structure of isophthalic acid restricted the molecular motion, so the water vapor transmittance of benzenoid polyester film significantly higher than that of benzenoid between polyester film, so isophthalic acid has good weatherability. The effect of different monomers on the coating resistance is considered when designing the formulation of the resistant polyester resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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