Dispersion retaining agent for hydraulic composition
A composition and hydraulic technology, applied in the field of dispersion and retention agents for hydraulic compositions
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Embodiment 1
[0073] · Example 1 {Synthesis of Vinyl Copolymer (EX-1), etc.}
[0074] Put 29.2 g of ion-exchanged water and 174.2 g of α-(3-methyl-3-butenyl)-ω-hydroxyl-poly(n=53) ethylene oxide into a tube equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen gas introduction tube. After uniformly dissolving it under stirring, the atmosphere was replaced with nitrogen, and the temperature of the reaction system was adjusted to 65° C. using a warm water bath. Next, 10.8 g of 3.5% hydrogen peroxide was added dropwise over 3 hours, and an aqueous solution in which 15.2 g of 2-acryloyloxyethylsuccinic acid and 28.3 g of hydroxyethyl acrylate were suspended was added dropwise over 3 hours to 174.2 g of ion-exchanged water. Furthermore, an aqueous solution in which 1.0 g of L-ascorbic acid and 0.8 g of mercaptoethanol were dissolved was added dropwise to 7.3 g of ion-exchanged water over 4 hours. Thereafter, the temperature was maintained at 65° C. for 2 hours to terminate t...
Embodiment 2
[0075] Example 2 {Synthesis of Vinyl Copolymer (EX-2)}
[0076] 206.5 g of ion-exchanged water, 151.7 g of α-methacryloyl-ω-methoxy-poly(n=23) ethylene oxide, 23.3 g of 2-methacryloyloxyethyl succinic acid, and hydroxyethyl acrylate 19.4 g and 2.3 g of 3-mercaptopropionic acid were put into the same reaction vessel as in Example 1, and the atmosphere was replaced with nitrogen while stirring, and the temperature of the reaction system was set to 70° C. using a warm water bath. The reaction was initiated by adding 28.0 g of 3.0% sodium persulfate in water. Three hours after the start of the reaction, 6.8 g of an aqueous solution of 3.0% sodium persulfate was added, and the temperature was maintained at 70° C. for 3 hours to terminate the polymerization reaction. Thereafter, 30% aqueous sodium hydroxide solution was added to adjust the pH to 6, and the concentration was adjusted to 40% with ion-exchanged water to obtain an aqueous solution of the reactant. This reactant was re...
Embodiment 3
[0077] · Example 3 {Synthesis of Vinyl Copolymer (EX-3)}
[0078] 27.9 g of ion-exchanged water and 173.0 g of α-(3-methyl-3-butenyl)-ω-hydroxyl-poly(n=53) ethylene oxide were dropped into the same reaction vessel as in Example 1, and stirred After it was uniformly dissolved under the hood, the atmosphere was replaced with nitrogen, and the temperature of the reaction system was adjusted to 65° C. using a warm water bath. Then, 10.8 g of 3.5% hydrogen peroxide was added dropwise for 3 hours, and at the same time, 43.2 g of 2-acryloyloxyethylsuccinic acid was suspended in 173.0 g of ion exchanged water for 3 hours. An aqueous solution in which 0.9 g of L-ascorbic acid and 0.7 g of 3-mercaptopropionic acid were dissolved was added dropwise to 6.1 g of exchanged water. Thereafter, the temperature was maintained at 65° C. for 2 hours to terminate the polymerization reaction. After the polymerization reaction was terminated, 30% aqueous sodium hydroxide solution was added to adju...
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