News Details
Organic urea low temperature crosslinking agent for coating
2017-9-4 12:14:39
Organic urea low temperature crosslinking agent for coating
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% organic epoxy powder coating low-temperature crosslinking agent, such as urea can 8 min at 130 degrees Celsius and 140 degrees c for 4 min condition completely crosslinking, make the powder coating is applied to plastics, paper, cardboard and wood heat sensitive substrate surface coating such as possible.
Powder coating is recognized as a 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 crosslinking temperature is high, which also increases the energy consumption and reduces the temperature of the crosslinking temperature by 10 degrees centigrade, which can save about 10% of the energy of coating energy.
The length of the crosslinking time also leads to the large area of continuous production line, which increases the remaining time of the product in the roasting chamber, which is unfavorable to the production cost and production efficiency.
Therefore, it is of great significance to study the low temperature crosslinking and rapid crosslinking of powder coatings. 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.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
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% organic epoxy powder coating low-temperature crosslinking agent, such as urea can 8 min at 130 degrees Celsius and 140 degrees c for 4 min condition completely crosslinking, make the powder coating is applied to plastics, paper, cardboard and wood heat sensitive substrate surface coating such as possible.
Powder coating is recognized as a 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 crosslinking temperature is high, which also increases the energy consumption and reduces the temperature of the crosslinking temperature by 10 degrees centigrade, which can save about 10% of the energy of coating energy.
The length of the crosslinking time also leads to the large area of continuous production line, which increases the remaining time of the product in the roasting chamber, which is unfavorable to the production cost and production efficiency.
Therefore, it is of great significance to study the low temperature crosslinking and rapid crosslinking of powder coatings. 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.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Experimental reagents and instruments: bisphenol A epoxy resin e-12, rutile titanium dioxide, 4, 4-diphenylmethane diisocyanate (MDI) are industrial products; Barium sulfate is pure; 3 - dimethylamine, 2, 2-2 (4 - hydroxybenzene) propane (bisphenol A) and benzoic are chemically pure.
SFJ - 32N seamless extruder; High speed universal mill; Infrared oven; MSGNA - IR760 infrared analyzer; Standard screen.
The synthesis of low temperature crosslinking agent with bisphenol A. It is said to take 0.5 molMDI in three flask and hold it for 30min at 70 degrees centigrade, making it slowly change from solid to full liquid. Add 1.0 mol3-dimethylaminamide to 2h and increase to 95 degrees Celsius.
When the drops are added, the temperature rises to 140 degrees centigrade, and the heat preservation reaction is 1h until the isocyanates are exhausted, producing a light yellow solid substance. Diphenylmethane - 4, 4-2 [N, n-dimethylamurea]
Continue to heat up to 165 degrees Celsius, add 0.98 mol A solution of organic urea, 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%.
Epoxy resin and low temperature crosslinking agent. 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. Residual acetone is removed at 60 degrees Celsius in a vacuum drying oven. The product is A mixture of bisphenol A epoxy resin e-12 and organic urea with bisphenol A.
Urea is an organic compound composed of carbon, nitrogen, oxygen and hydrogen, with molecular formula H2NCONH2. Also known as urea, carbon amide, carbamide urea, white odourless solid, melting point 133-135 ℃, relative density 1.323 (20/4 ℃), soluble in water and ethanol, strong thermal decomposition into ammonia and carbon dioxide.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Experimental reagents and instruments: bisphenol A epoxy resin e-12, rutile titanium dioxide, 4, 4-diphenylmethane diisocyanate (MDI) are industrial products; Barium sulfate is pure; 3 - dimethylamine, 2, 2-2 (4 - hydroxybenzene) propane (bisphenol A) and benzoic are chemically pure.
SFJ - 32N seamless extruder; High speed universal mill; Infrared oven; MSGNA - IR760 infrared analyzer; Standard screen.
The synthesis of low temperature crosslinking agent with bisphenol A. It is said to take 0.5 molMDI in three flask and hold it for 30min at 70 degrees centigrade, making it slowly change from solid to full liquid. Add 1.0 mol3-dimethylaminamide to 2h and increase to 95 degrees Celsius.
When the drops are added, the temperature rises to 140 degrees centigrade, and the heat preservation reaction is 1h until the isocyanates are exhausted, producing a light yellow solid substance. Diphenylmethane - 4, 4-2 [N, n-dimethylamurea]
Continue to heat up to 165 degrees Celsius, add 0.98 mol A solution of organic urea, 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%.
Epoxy resin and low temperature crosslinking agent. 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. Residual acetone is removed at 60 degrees Celsius in a vacuum drying oven. The product is A mixture of bisphenol A epoxy resin e-12 and organic urea with bisphenol A.
Urea is an organic compound composed of carbon, nitrogen, oxygen and hydrogen, with molecular formula H2NCONH2. Also known as urea, carbon amide, carbamide urea, white odourless solid, melting point 133-135 ℃, relative density 1.323 (20/4 ℃), soluble in water and ethanol, strong thermal decomposition into ammonia and carbon dioxide.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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