Composite slump-loss-resistant polycarboxylic acid water reducing agent and preparation method thereof
A technology of water reducer and polycarboxylic acid, which is applied in the field of polycarboxylate water reducer and its preparation, which can solve the problems of unsatisfactory dispersion effect, fast hydrolysis speed of water reducer, and inability to guarantee the slump retention of concrete , achieve good concrete slump retention, solve the effect of excessive slump loss, and good initial dispersion
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Embodiment 1
[0031] Embodiment one: Add 50 g of methallyl polyglycol ether and 31.7 g of deionized water into the reaction flask, and heat in a water bath. 4.5g of acrylic acid was dissolved in 22g of deionized water, 0.27g of ammonium persulfate and 0.2g of mercaptopropionic acid were dissolved in 28g of deionized water. After the temperature is heated to 80°C, the above two solutions are added dropwise, and the dropwise addition is completed within 3 hours, and the heat preservation reaction is continued for 2 hours, the temperature is lowered to 40°C, and the pH value is adjusted to neutral with 20% sodium hydroxide. properties to obtain a non-crosslinked polycarboxylate water reducer with a solid content of 40%.
Embodiment 2
[0032] Embodiment two: Add 50 g of methallyl polyglycol ether and 33.2 g of deionized water into the reaction flask, and heat in a water bath. 5.1 g of acrylic acid and 0.41 g of ethylene glycol dimethacrylate were mixed to obtain a monomer mixture; 0.33 g of ammonium persulfate and 0.2 g of mercaptopropionic acid were dissolved in 50 g of deionized water. After the temperature is heated to 80°C, the above two mixed solutions are added dropwise, and the dropwise addition is completed within 3 hours, and the heat preservation reaction is continued for 2 hours, the temperature is lowered to 40°C, and the pH value is adjusted to Neutral, get a cross-linked polycarboxylate superplasticizer with a solid content of 40%.
[0033] After compounding the cross-linked polycarboxylate water-reducer obtained in this example with the non-cross-linked polycarboxylate water-reducer obtained in Example 1 at a weight ratio of 9:18, a composite slump-retaining polycarboxylate was obtained. Wa...
Embodiment 3
[0034] Embodiment three: Add 50 g of methallyl polyglycol ether and 34.1 g of deionized water into the reaction flask, and heat in a water bath. 4.8 g of acrylic acid and 1.24 g of ethylene glycol dimethacrylate were mixed to obtain a monomer mixture; 0.34 g of ammonium persulfate and 0.2 g of mercaptopropionic acid were dissolved in 50 g of deionized water. After the temperature is heated to 80°C, the above two mixed solutions are added dropwise, and the dropwise addition is completed within 3 hours, and the heat preservation reaction is continued for 2 hours, the temperature is lowered to 40°C, and the pH value is adjusted to Neutral, get a cross-linked polycarboxylate superplasticizer with a solid content of 40%.
[0035] After compounding the cross-linked polycarboxylate water-reducer obtained in this example with the non-cross-linked polycarboxylate water-reducer obtained in Example 1 at a weight ratio of 9:17, a composite slump-retaining polycarboxylate Water reducing a...
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