formula:
Rosin 36%
Maleic anhydride 8%
Ethylene glycol 20%
Diethylene glycol 16%
Urea 8%
Triethanolamine 12%
Process:
1, according to the amount of rosin into the reaction kettle, began to warm up
2. As the temperature rises, the rosin begins to dissolve, and it starts to stir at 180 degrees. The maleic anhydride is put into the reaction vessel and continues to heat up to 200 degrees. After the solution is completely dissolved, the temperature starts to incubate. The acid value in the kettle is measured at 240-250 in about 3 hours. When the ethylene glycol and diethylene glycol are put into the kettle, stir until the temperature drops to 170 degrees, and then keep warm for two hours before cooling.
3. After 1 hour, the temperature is reduced to 100 degrees and urea is added. After the temperature is maintained for one hour, the temperature is lowered.
4. When the temperature drops to 70 degrees, add triethanolamine slowly, adjust the PH value, control PH=7.5-9, keep warm
5, Insulation for 1 hour, cooling down to 30 degrees, testing, qualified after discharge packaging ready
Source: 21st Century Fine Chemicals Network