High slump retaining type polycarboxylic acid water reducing agent with sustained-release effect and preparation method thereof
A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of large slump loss and poor slump retention performance, and achieve the effects of no loss of slump, excellent product performance, and wide applicability
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Embodiment 1
[0022] In a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g deionized water, 120g prenol polyoxyethylene ether (polymerization degree n=54), turn on nitrogen, heat in a water bath, and control the temperature. When the temperature is about 40°C, stir while heating, after the prenol polyoxyethylene ether melts, slowly increase the temperature to 60°C, add 2.84g acrylamide, dropwise add 132g aqueous solution containing 5g ammonium persulfate and 78 g of a mixed aqueous solution of 28.6 g of hydroxyethyl methacrylate, 17.2 g of methacrylic acid, 0.3 g of thioglycolic acid, and 0.017 g of hydroquinone. The dropping time of the mixed aqueous solution of hydroxyethyl methacrylate, methacrylic acid, thioglycolic acid and hydroquinone is 3.5h, the dropping time of the ammonium persulfate aqueous solution is 4h, and the temperature is kept at 60°C for 1h after the dropping. Finally, the temperature is lowered, alkali is added to neutralize,...
Embodiment 2
[0024] In a 500ml four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, add 100g deionized water and 130g allyl polyglycol ether (polymerization degree n=23) in sequence, turn on nitrogen, heat in a water bath, and control the temperature When the temperature is about 40℃, stir while heating, after the allyl polyglycol ether macromonomer melts, slowly increase the temperature to 60℃, add 3.62g 2-acrylamido-2-methylpropanesulfonic acid Sodium, 135g of aqueous solution containing 5g of ammonium persulfate and 86.5g of mixed aqueous solution containing 27.2g of hydroxypropyl acrylate, 18.6g of acrylic acid, 0.3g of thioglycolic acid and 0.022g of phenothiazine were added dropwise. The dripping time of the mixed aqueous solution of hydroxypropyl enoate, acrylic acid, thioglycolic acid and phenothiazine is 3.5h, the dripping time of the ammonium persulfate aqueous solution is 4h, and the temperature is kept at 60°C for 2h after dripping. Finally, the temper...
Embodiment 3
[0026] In a 500ml four-necked flask equipped with a thermometer, stirrer and dropping funnel, add 100g deionized water, 126g prenol polyoxyethylene ether (polymerization degree n=54), turn on nitrogen, heat in a water bath, and control the temperature When the temperature is about 40℃, stir while heating, after the isopentenol polyoxyethylene ether macromonomer melts, slowly increase the temperature to 60℃, add 3.27g acrylamide, and add dropwise each containing 4.6g potassium persulfate 144 g of aqueous solution and 87.5 g of mixed aqueous solution containing 28.3 g of hydroxyethyl acrylate, 17.8 g of methacrylic acid, 0.35 g of sodium methacrylic acid sulfonate and 0.024 g of hydroquinone. The dripping time of the mixed aqueous solution of hydroxyethyl acrylate, methacrylic acid, sodium methacrylic acid sulfonate and hydroquinone is 3.5h, and the dripping time of the potassium persulfate aqueous solution is 4h. After the dripping, the temperature will be kept at 60℃ 3h. Final...
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