News Details
The low temperature crosslinking powder coating
2017-4-24 18:31:15
The low temperature crosslinking powder coating,The powder coating are four "E" (Economical - economic, Environmental, Environmental protection, Efficient - high efficiency, Excellent performance, performance excellence) advantages, but some of its weakness is obvious. Such as crosslinking is quite harsh conditions, crosslinking temperature is between 180 ~ 200 ℃.
If you can reduce the crosslinking temperature can reduce energy consumption, is the need of environmental protection, energy conservation and emissions reduction. Crosslinking temperature is high, in addition to causing high energy consumption, for some not ability in the base material of high temperature, such as plastic, wood coating is restricted, expand greatly influence the powder coating applications.
From the perspective of further improve efficiency consideration, often can be low temperature crosslinking of powder coatings, under the condition of keeping constant temperature, shorten the crosslinking time, improve production efficiency. Thus realize powder coating of low temperature crosslinking, has become one of the development direction of powder coatings industry.
For a long time, engaged in powder coating as well as related fields such as raw materials, equipment, with the help of colleagues in powder coating of low temperature crosslinking has made considerable progress. Now pure epoxy system sand grain effect products can do 130 ℃ / crosslinking 15 minutes. Plane highlights epoxy system can do 140 ℃ / crosslinking 15 minutes.
But epoxy yellowing resistance and weather resistance is poor, cannot be used for outdoor use. Compared with epoxy system better resistance to yellowing of the polyester/epoxy hybrid system sand grain products can do 135 ℃ / 15 minutes, the plane specular products can do 150 ℃ / 15 minutes crosslinking (flow leveling is a bit poor).
Pure polyester system sand grain products can do 140 ℃ / 15 minutes crosslinking, plane highlights crosslinking can be 160 ℃ / 15 minutes. But pure polyester system planar low light products is still very difficult. Realize the powder coating cryogenic associated technology has great difficulty.
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.
First of all, powder coating crosslinked system is a kind of latent crosslinking system at low temperature, low temperature high reactivity, if the system is bound to affect the powder powder extrusion and storage stability, on the other hand powder coating resin and the crosslinking agent are adopted by the solid high softening point, melt viscosity at low temperature is higher, in the crosslinking of low temperature and coating flow flat hard, affect the surface effect.
If the low softening point of the resin and crosslinking agent, though may reduce the melt viscosity, but the storage stability of powder, need low temperature cold storage, bring inconvenience to use.
Can, therefore, to find a suitable for powder store there are both high softening point and proper reactivity of resin and crosslinking agent is the key to the preparation of low temperature crosslinking powder coating.
Low temperature crosslinking powder coating development direction To reduce the crosslinking temperature of powder coating, the resin from the body, crosslinking agent and catalyst, infrared radiation crosslinking, uv crosslinking, spray drying method to manufacture powder coatings powder coatings and free radicals reaction crosslinking aspects to discuss.
Thermoplastic or thermosetting powder coating whether, film-forming temperature of around 180-200 ℃, crosslinking time (10 to 20 min), which limits its can only be used for heat resistant base material, such as metals and time-consuming, relatively large energy consumption. Every 10 ℃ below the crosslinking temperature about 10% energy saving, to save energy to reduce costs, expand the range of coating powder coating, better with solvent-based coating, powder coating must be to develop in the direction of low temperature crosslinking type.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
If you can reduce the crosslinking temperature can reduce energy consumption, is the need of environmental protection, energy conservation and emissions reduction. Crosslinking temperature is high, in addition to causing high energy consumption, for some not ability in the base material of high temperature, such as plastic, wood coating is restricted, expand greatly influence the powder coating applications.
From the perspective of further improve efficiency consideration, often can be low temperature crosslinking of powder coatings, under the condition of keeping constant temperature, shorten the crosslinking time, improve production efficiency. Thus realize powder coating of low temperature crosslinking, has become one of the development direction of powder coatings industry.
For a long time, engaged in powder coating as well as related fields such as raw materials, equipment, with the help of colleagues in powder coating of low temperature crosslinking has made considerable progress. Now pure epoxy system sand grain effect products can do 130 ℃ / crosslinking 15 minutes. Plane highlights epoxy system can do 140 ℃ / crosslinking 15 minutes.
But epoxy yellowing resistance and weather resistance is poor, cannot be used for outdoor use. Compared with epoxy system better resistance to yellowing of the polyester/epoxy hybrid system sand grain products can do 135 ℃ / 15 minutes, the plane specular products can do 150 ℃ / 15 minutes crosslinking (flow leveling is a bit poor).
Pure polyester system sand grain products can do 140 ℃ / 15 minutes crosslinking, plane highlights crosslinking can be 160 ℃ / 15 minutes. But pure polyester system planar low light products is still very difficult. Realize the powder coating cryogenic associated technology has great difficulty.
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.
First of all, powder coating crosslinked system is a kind of latent crosslinking system at low temperature, low temperature high reactivity, if the system is bound to affect the powder powder extrusion and storage stability, on the other hand powder coating resin and the crosslinking agent are adopted by the solid high softening point, melt viscosity at low temperature is higher, in the crosslinking of low temperature and coating flow flat hard, affect the surface effect.
If the low softening point of the resin and crosslinking agent, though may reduce the melt viscosity, but the storage stability of powder, need low temperature cold storage, bring inconvenience to use.
Can, therefore, to find a suitable for powder store there are both high softening point and proper reactivity of resin and crosslinking agent is the key to the preparation of low temperature crosslinking powder coating.
Low temperature crosslinking powder coating development direction To reduce the crosslinking temperature of powder coating, the resin from the body, crosslinking agent and catalyst, infrared radiation crosslinking, uv crosslinking, spray drying method to manufacture powder coatings powder coatings and free radicals reaction crosslinking aspects to discuss.
Thermoplastic or thermosetting powder coating whether, film-forming temperature of around 180-200 ℃, crosslinking time (10 to 20 min), which limits its can only be used for heat resistant base material, such as metals and time-consuming, relatively large energy consumption. Every 10 ℃ below the crosslinking temperature about 10% energy saving, to save energy to reduce costs, expand the range of coating powder coating, better with solvent-based coating, powder coating must be to develop in the direction of low temperature crosslinking type.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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