Polymerization method for preparing polycarboxylic high-efficiency water-reducing agent
A high-efficiency water-reducing agent and polycarboxylic acid-based technology, which is applied in the field of organic polymer synthesis, can solve the problems of difficulty in controlling the dripping ratio of monomers and initiators, unstable product quality, and high equipment requirements, and achieves artificial and mechanical requirements. The effect of small influencing factors, stable product quality and low equipment requirements
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Embodiment 1
[0030] Add 50 g of methoxypolyethylene glycol methacrylate (n=23), 15 g of methacrylic acid, 0.006 g of hydroquinone, 0.5 g of mercaptopropionic acid, and Ammonium sulfate 3.5g, water 60g, stir evenly to form a homogenized body for use.
[0031] Add 90 g of water to a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, a nitrogen inlet bottle and a reflux condenser, and keep the temperature in the reactor at 85° C. in a nitrogen atmosphere. Then, the homogenized body prepared above was uniformly dropped into the reactor within 2 hours. After the dropwise addition was complete, the reaction mixture was maintained at 85°C for 1 hour. Then, adjust the pH value of the reaction mixture to 5.5-7.0 with sodium hydroxide to obtain a polycarboxylic acid-based high-efficiency water reducer.
Embodiment 2
[0033] Add 50 g of methoxypolyethylene glycol methacrylate (n=26), 10 g of methacrylic acid, 5 g of acrylic acid, 0.001 g of hydroquinone, and 0.001 g of phenothiazine into a glass reactor equipped with a thermometer and a stirrer. g, 0.8 g of mercaptoethanol, 4.5 g of ammonium persulfate, and 60 g of water, stirred evenly to form a homogenized body for later use.
[0034] Add 80 g of water to a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, a nitrogen inlet bottle and a reflux condenser, and keep the temperature in the reactor at 80° C. in a nitrogen atmosphere. Then, the homogenized body prepared above was uniformly dropped into the reactor within 2 hours. After the dropwise addition was complete, the reaction mixture was kept at 80° C. for 1 hour. Then, adjust the pH value of the reaction mixture to 5.5-7.0 with sodium hydroxide to obtain a polycarboxylic acid-based high-efficiency water reducer.
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