Fluorescent type polycarboxylate water reducer and preparation method thereof
A technology of polycarboxylate and water reducing agent, which is applied in the field of water reducing agent for cement concrete, which can solve the problems of short service life and achieve the effects of reducing the difficulty of reaction, simple production process, good cost performance and competitive advantage
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Embodiment 1
[0027] 1) Keep 2 mol of acrylic acid, 1 mol of allyl polyethylene glycol (weight average molecular weight 300) under the combined action of 0.1 mol of hydrogen peroxide, 0.05 mol of white block, and 0.03 mol of 2-mercaptopropionic acid at a temperature of 5°C Carry out redox free radical polymerization reaction for 5 hours under low temperature to obtain the pre-product of water reducer;
[0028] 2) 1 mol of the water reducer pre-product obtained in step 1) and 10 mol of N-(hydroxyethyl) carbazole with fluorescent properties were subjected to an esterification reaction for 5 hours under the action of 0.1 mol of solid acid, and then potassium hydroxide was used to The pH value was adjusted to 7, and water was added to obtain a fluorescent polycarboxylate water reducer with a concentration of 60 wt % and a weight average molecular weight of 20,000.
Embodiment 2
[0030] 1) Keep 3mol methacrylic acid, 1mol methallyl polyethylene glycol (weight average molecular weight 800) under the action of 0.08mol ammonium persulfate, 0.1mol sodium sulfite and 0.04mol mercaptoethanol at a temperature of 15°C Carrying out 4 hours of redox radical polymerization to obtain the pre-product of water reducer;
[0031] 2) 1 mol of the pre-product of the water reducer obtained in step 1) and 7 mol of N-(hydroxymethyl) carbazole with fluorescent properties were subjected to an esterification reaction for 3 hours under the action of 0.08 mol of concentrated sulfuric acid, and then dissolved in sodium hydroxide The pH value was adjusted to 6, and water was added to obtain a fluorescent polycarboxylate water reducer with a concentration of 50 wt % and a weight average molecular weight of 40,000.
Embodiment 3
[0033] 1) 4mol sodium acrylate, 1mol 3-methyl-3-butene-1-polyethylene glycol (weight average molecular weight is 1000), in 0.06mol sodium persulfate, 0.15mol sodium metabisulfite and 0.05mol dodecanethiol Under the combined action, keep the temperature at 25°C for 3 hours for redox radical polymerization to obtain the pre-product of the water reducer;
[0034] 2) 1 mol of the water reducer pre-product obtained in step 1) and 6 mol of 9-(p-hydroxymethyl)phenylcarbazole with fluorescent properties were subjected to an esterification reaction for 4 hours under the action of 0.03 mol of p-toluenesulfonic acid, and then Calcium hydroxide is used to adjust the pH value to 6.5, and water is added to obtain a fluorescent polycarboxylate water-reducer with a concentration of 50 wt % and a weight-average molecular weight of 50,000.
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