Polyaspartic acid/urea graft copolymer and its preparation method and application
A technology of polyaspartic acid and graft copolymer, which is applied in the fields of chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. Based on environmental pollution, unfavorable industrial production and other problems, to achieve excellent scale inhibition effect, less environmental pollution, and cheap raw materials
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preparation Embodiment 1
[0035] Weigh 9.8g of maleic anhydride and 5.5g of absolute ethanol into a three-neck flask, react at 60°C for 2.5h to obtain a colorless solution, cool to room temperature to obtain monoethyl maleate.
preparation Embodiment 2
[0037] Weigh 9.8g of maleic anhydride and 5.5g of absolute ethanol into a three-necked flask, react at 60°C for 2.5h to obtain a colorless solution, and cool to room temperature. Add 8.9 g of 25% ammonia water into the three-necked flask, and react at room temperature for 3 h to obtain a pale yellow ammonium salt solution.
preparation Embodiment 3
[0039] Add 9.8g of maleic anhydride and 5.53g of ethanol into a three-necked flask, and react at a temperature of 60°C. As the reaction progresses, the solid dissolves, and the reaction stops after 2.5h to obtain a colorless monoethyl maleate solution, which is cooled to room temperature. Add 8.9 g of 25% ammonia water to the three-necked flask with a constant pressure dropping funnel and react at room temperature for 3 hours to obtain a light yellow ammonium salt solution. 15g sulfolane and nitrogen methylpyrrolidone (1:1) mixed solvent are added in the flask, and white turbidity is arranged to appear, and in N 2 Protection, mechanical stirring, thermal polycondensation under the condition of water separation, and reaction at 180°C for 6h. As the reaction temperature increased, the turbidity disappeared, and when the temperature was higher than 150 °C, the solution began to turn orange, and the color continued to deepen, and finally a brown viscous solution was obtained. Th...
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