Polycarboxylic acid water reducing agent for gypsum and preparation method thereof
A technology of water reducer and polycarboxylic acid, which is applied in the field of polycarboxylate water reducer for gypsum and its preparation, can solve the problems of unfavorable rapid production of gypsum board and cumbersome operation, and achieve the goal of not delaying the solidification of gypsum, low energy consumption, high The effect of water reduction rate
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Embodiment 1
[0031] Add 120g of GE-1 and 120g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 80°C. Add dropwise the monomer aqueous solution that is mixed with 17.6g methacrylic acid, 1.6g2-mercaptopropionic acid, 90g deionized water and 10g of potassium persulfate aqueous solution of 10wt% at the same time, drop time is controlled at about 90 minutes, and reaction temperature is controlled at 78 -85°C. After the dropwise addition, the temperature was kept for 45 minutes to complete the polymerization. Add 17.25 g of 28 wt % ammonia water to neutralize to about pH 6.5. The water reducer of the present invention was obtained, which was designated as PG-1.
Embodiment 2
[0033] Add 120g of GE-2 and 120g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 80°C. At the same time, 10 g of monomer aqueous solution mixed with 35.6 g of methacrylic acid, 7.6 g of sodium vinyl sulfonate, 1.2 g of mercaptoethanol, 70 g of deionized water and 10 wt % of ammonium persulfate aqueous solution were added dropwise, and the dropping time was controlled at about 90 minutes , the reaction temperature is controlled at 78-85°C. After the dropwise addition, the temperature was kept for 45 minutes to complete the polymerization. Add 13.75 g of 28 wt % ammonia water to neutralize to about pH 6.5. The water reducer of the present invention is obtained, which is denoted as PG-2.
Embodiment 3
[0035]Add 120g of GE-3 and 120g of deionized water into a 500ml four-neck flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 85°C. Simultaneously add dropwise the monomer aqueous solution mixed with 17.28g methacrylic acid, 0.8g mercaptoacetic acid, 70g deionized water, 7.8g butyl methacrylate and 10g aqueous potassium persulfate solution of 15wt%, and the dropping time is controlled at about 120 minutes , the reaction temperature is controlled at 83-88°C. After the dropwise addition was completed, the insulation was kept for 30 minutes to complete the polymerization. Add 15g of 28wt% ammonia water to neutralize to about pH 6.5. The water reducer of the present invention was obtained, which was designated as PG-3.
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