Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof
A slow-release polycarboxylic acid and high-performance technology, which is applied in the field of concrete water-reducing agent and its preparation, can solve the problem that the concrete slump performance cannot be satisfied, the water-reducing rate of the water-reducing agent is low, and the water-reducing function does not have a slow-release effect and other problems, to achieve the effect of high water reducing rate, excellent slump retention performance and wide adaptability
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Embodiment 1
[0041] 0.13mol of monomer A is methylalkenyl polyoxyethylene with a degree of polymerization of 30-60;
[0042] 0.32mol monomer B is acrylic acid;
[0043] 0.01mol monomer C is sodium methacrylate;
[0044] 0.12mol monomer D is acrylamide;
[0045] 0.05mol monomer E is ethyl acetate;
[0046] The initiator is a mixture of sodium sulfate and potassium persulfate in a ratio of 1:1;
[0047] The chain transfer agent is mercaptoacetic acid;
[0048] Preparation steps:
[0049] a. Dissolve monomer C, monomer D, monomer E, and monomer B in an equimolar amount to monomer D in deionized water, stir evenly, and obtain a small monomer solution for use;
[0050] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use; the consumption of the chain transfer agent is 0.05% by weight of the total monomer weight of the reaction;
[0051] c. Put the monomer A and deionized water into the reaction container and...
Embodiment 2
[0054] 0.13mol of monomer A is allyl polyoxyethylene ether with a degree of polymerization of 30-60;
[0055] 0.32mol monomer B is methacrylic acid;
[0056] 0.01mol monomer C is sodium methacrylate;
[0057] 0.12mol monomer D is 2-acrylamido-methylpropanesulfonic acid;
[0058] 0.05mol monomer E is styrene;
[0059] The initiator is hydrogen peroxide;
[0060] The chain transfer agent is a mixture of mercaptoacetic acid, 2-mercaptopropionic acid and 3-mercaptopropionic acid in a ratio of 1:1:1;
[0061] Preparation steps:
[0062] a. Dissolve monomer C, monomer D, monomer E, and monomer B in an equimolar amount to monomer D in deionized water, stir evenly, and obtain a small monomer solution for use;
[0063] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use; the consumption of the chain transfer agent is 0.2% by weight of the total monomer weight of the reaction;
[0064] c. Put the mo...
Embodiment 3
[0067] 0.13mol of monomer A is polyoxypropylene ether with a degree of polymerization of 30-60;
[0068] 0.32mol monomer B is acrylic acid;
[0069] 0.01mol monomer C is sodium methacrylate;
[0070] 0.12mol monomer D is acrylamide;
[0071] 0.05mol monomer E is ethyl acetate;
[0072] The initiator is a mixture of sodium sulfate and hydrogen peroxide at 2:1;
[0073] Chain transfer agent is sodium bisulfite;
[0074] Preparation steps:
[0075] a. Dissolve monomer C, monomer D, monomer E, and monomer B in an equimolar amount to monomer D in deionized water, stir evenly, and obtain a small monomer solution for use;
[0076] B, the chain transfer agent is dissolved in deionized water, stirred evenly, and the chain transfer agent solution is obtained for use; the consumption of the chain transfer agent is 0.4% by weight of the total monomer weight of the reaction;
[0077] c. Put the monomer A and deionized water into the reaction container and heat to dissolve. After the ...
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