News Details
The coating USES organic urea-like low temperature crosslinking agent
2017-5-3 16:26:41
The coating USES organic urea-like low temperature crosslinking agent.With 4, 4 - diphenyl methane diisocyanate (MDI) and 3 - amino propyl amine as raw material, dimethyl synthetic low-temperature crosslinking agent such as a kind of organic urea diphenyl methane - 4-2 / N, N - dimethyl amine c urea, and improved the production technology of powder coating, the epoxy powder coating completely cross-linking under low temperature.
Adding 11% epoxy powder coating urea organic crosslinker, 8 min at 130 degrees Celsius and 140 degrees Celsius for 4 min completely under the condition of crosslinking, make the powder coating is applied to plastics, paper, cardboard and wood heat sensitive substrate surface coating such as possible.
Powder coating is an accepted high production efficiency, excellent coating performance, ecological environmental protection, economical type 4E coating products. Its VOC emissions are almost zero, and environmental demands are driving its rapid growth.
But thermoplastic or thermosetting powder coating whether its film temperature is high, generally need to above 180 degrees Celsius for 20 min, make its applications are limited to heat-resistant base material such as metals, cannot be applied to heat sensitive substrate. The high temperature of crosslinking will also increase the energy consumption and reduce the temperature of the crosslinking temperature by 10 degrees Celsius.
It also results in a large area of continuous production line, which increases the time of the product in the roasting chamber, which is bad for the production cost and the production efficiency.
Therefore, it is of great significance to study powder coating for low temperature crosslinking and rapid crosslinking. This paper synthesized a kind of organic urea class low temperature crosslinking agent, the epoxy powder coating can be fast crosslinked at low temperatures, so that the powder coating is applied to plastics, paper, cardboard and wood heat sensitive substrate such as possible, has the very good industrial application prospect.
Experimental reagents and instruments: diphenol A epoxy resin e-12, rutile titanium powder, 4, 4-diphenyl methane diisocyanate (MDI) are industrial products; Barium sulphate for pure analysis; 3 - dimethylamine, 2, 2-2 (4-hydroxybenzene) propane (bisphenol A) and benzoin are chemically pure.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
SFJ - 32N. High speed universal mill; An infrared oven; MSGNA -ir760 infrared analyzer; Standard screen.
Synthesis of low-temperature crosslinking agent with bisphenol A. Call it 0.5 molMDI in three flasks, at 70 degrees centigrade heat insulation 30min, making it slowly turn from solid to full liquid. Add 1.0 mol3-dimethylamine to 2h and heat up to 95 degrees Celsius.
When the drops are added, the temperature rises to 140 degrees centigrade, the heat insulation reacts 1h, until isocyanate runs out, and produces a light yellow solid substance. Diphenylmethane - 4-4-2 [N, n-dimethylamide]
Continue to heat up to 165 degrees Celsius, add 0.98 moles of bisphenol A to dissolve the organic urea compound, the reaction product becomes clear solution. Strike out, cooling solidification, adding acetone dissolved, vacuum distillation, removing acetone, get brown solid product, is the organic urea compounds containing bpa diphenyl methane - 4-2 / N, N - dimethyl amine c urea, its molecular weight is 454, the yield was 98%.
A mixture of epoxy and cryogenic crosslinking agents. According to take A certain amount of bisphenol A type epoxy resin E - 12 and synthetic organic containing bisphenol A type of low temperature crosslinking agent, adding acetone, dissolved in full, under the stirring in 60 degrees Celsius under reduced pressure removing acetone. The remaining acetone is removed at 60 degrees Celsius in a vacuum drying oven. The product is A mixture of bisphenol A, the e-12, and organic urea, which contains bisphenol A.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Adding 11% epoxy powder coating urea organic crosslinker, 8 min at 130 degrees Celsius and 140 degrees Celsius for 4 min completely under the condition of crosslinking, make the powder coating is applied to plastics, paper, cardboard and wood heat sensitive substrate surface coating such as possible.
Powder coating is an accepted high production efficiency, excellent coating performance, ecological environmental protection, economical type 4E coating products. Its VOC emissions are almost zero, and environmental demands are driving its rapid growth.
But thermoplastic or thermosetting powder coating whether its film temperature is high, generally need to above 180 degrees Celsius for 20 min, make its applications are limited to heat-resistant base material such as metals, cannot be applied to heat sensitive substrate. The high temperature of crosslinking will also increase the energy consumption and reduce the temperature of the crosslinking temperature by 10 degrees Celsius.
It also results in a large area of continuous production line, which increases the time of the product in the roasting chamber, which is bad for the production cost and the production efficiency.
Therefore, it is of great significance to study powder coating for low temperature crosslinking and rapid crosslinking. This paper synthesized a kind of organic urea class low temperature crosslinking agent, the epoxy powder coating can be fast crosslinked at low temperatures, so that the powder coating is applied to plastics, paper, cardboard and wood heat sensitive substrate such as possible, has the very good industrial application prospect.
Experimental reagents and instruments: diphenol A epoxy resin e-12, rutile titanium powder, 4, 4-diphenyl methane diisocyanate (MDI) are industrial products; Barium sulphate for pure analysis; 3 - dimethylamine, 2, 2-2 (4-hydroxybenzene) propane (bisphenol A) and benzoin are chemically pure.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
SFJ - 32N. High speed universal mill; An infrared oven; MSGNA -ir760 infrared analyzer; Standard screen.
Synthesis of low-temperature crosslinking agent with bisphenol A. Call it 0.5 molMDI in three flasks, at 70 degrees centigrade heat insulation 30min, making it slowly turn from solid to full liquid. Add 1.0 mol3-dimethylamine to 2h and heat up to 95 degrees Celsius.
When the drops are added, the temperature rises to 140 degrees centigrade, the heat insulation reacts 1h, until isocyanate runs out, and produces a light yellow solid substance. Diphenylmethane - 4-4-2 [N, n-dimethylamide]
Continue to heat up to 165 degrees Celsius, add 0.98 moles of bisphenol A to dissolve the organic urea compound, the reaction product becomes clear solution. Strike out, cooling solidification, adding acetone dissolved, vacuum distillation, removing acetone, get brown solid product, is the organic urea compounds containing bpa diphenyl methane - 4-2 / N, N - dimethyl amine c urea, its molecular weight is 454, the yield was 98%.
A mixture of epoxy and cryogenic crosslinking agents. According to take A certain amount of bisphenol A type epoxy resin E - 12 and synthetic organic containing bisphenol A type of low temperature crosslinking agent, adding acetone, dissolved in full, under the stirring in 60 degrees Celsius under reduced pressure removing acetone. The remaining acetone is removed at 60 degrees Celsius in a vacuum drying oven. The product is A mixture of bisphenol A, the e-12, and organic urea, which contains bisphenol A.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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