Slow release slump retaining polycarboxylate water reducer and preparation thereof
A water-reducing agent and slump-preserving technology, which is applied in the field of slow-release slump-preserving polycarboxylate water-reducing agent and its preparation field, can solve the problem of high content of water-reducing agent, improve the performance of water-reducing agent, and solve the problem of slump reduction. Excessive loss of degree and the effect of long-lasting slump retention
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[0033] Example one: 50g methallyl polyglycol ether, 3.75g acrylic acid, 1.79g methyl acrylate, 0.15g ethylene glycol dimethacrylate, 0.39g ammonium persulfate, 0.20g mercaptopropionic acid, 83.30g deionized Add water to the four-necked flask, heat the water bath to 85°C, react for 3 hours, cool to 40°C, adjust the pH value to neutral with 20% sodium hydroxide by mass concentration to obtain a slow release with a solid content of 40% Slump-preserving polycarboxylic acid water reducer.
Example Embodiment
[0034] Embodiment two: Add 50 g of methallyl polyglycol ether and 33.30 g of deionized water into a four-necked flask, and heat in a water bath. 3.75g acrylic acid, 0.15g triethylene glycol bismethacrylate and 1.79g methyl acrylate were mixed, 0.39g ammonium persulfate and 0.20g mercaptopropionic acid were added to 50g deionized water to make a solution. When the temperature is heated to 85℃, add the above two mixtures dropwise respectively. The dripping time is 3 hours. After the dripping is completed, the reaction is kept for 2 hours, and the temperature is reduced to 40℃. The pH is adjusted with sodium hydroxide with a mass concentration of 20%. The value is neutral, and a slow-release slump type polycarboxylic acid water reducing agent with a solid content of 40% is obtained.
Example Embodiment
[0035] Embodiment three: 50g methallyl polyglycol ether, 3.75g acrylic acid, 2.08g ethyl acrylate, 0.15g ethylene glycol dimethacrylate, 0.39g ammonium persulfate, 0.20g mercaptopropionic acid, 83.70g deionized Add water to the four-necked flask, heat the water bath to 85°C, react for 3 hours, cool to 40°C, adjust the pH value to neutral with 20% sodium hydroxide by mass concentration to obtain a sustained release with a solid content of 40% Slump-preserving polycarboxylic acid water reducer.
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