Slow-release high-adaptability polyester polycarboxylic acid water-reducing agent and preparation method and application thereof
A technology of polyester polycarboxylate and adaptability, which is applied in the field of mud-resistant polyester polycarboxylate water reducer and its preparation, and can solve the problems of high sensitivity to inorganic salt ions, lack of compatibility, low steric hindrance, etc. problems, to achieve the effects of good time retention, improved tolerance, and good adaptability
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[0042] Example 1
[0043] The present invention is an embodiment of a preparation method of a sustained-release polyester polycarboxylic acid water reducing agent with strong adaptability. The method described in this embodiment includes the following steps:
[0044] (1) Into a 1000ml four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 400ml deionized water, 0.14mol 3-mercaptopropionic acid (moles 3% of the total monomer moles), 1mol N,N-Dimethacrylamide, 1mol methacrylic acid, 0.5mol polyethylene glycol monomethyl ether methacrylate, 1mol hydroxypropyl acrylate and 1mol glycidyl methacrylate, fully stirred to obtain a mixed liquid;
[0045] (2) Raise the temperature of the above mixture to 90°C, add dropwise an aqueous solution of ammonium persulfate, the dropping time is 2.5h, after the dropping is completed, keep the reaction for 3h, lower the temperature to 48°C, adjust the pH to 6, and obtain a sustained release Polyester polycarboxylic acid wa...
Example Embodiment
[0046] Example 2
[0047] The present invention is an embodiment of a preparation method of a sustained-release polyester polycarboxylic acid water reducing agent with strong adaptability. The method described in this embodiment includes the following steps:
[0048] (1) In a 1000ml four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 300ml of deionized water, 0.004mol of 3-mercaptopropanol (the mole is 0.5% of the total monomer mole), 0.2mol CH 2 =CH-CONR 1 R 2 (R 1 For CH 3 , R 2 Is C 4 H 9 ), 0.1mol acrylic acid, 0.25mol polyethylene glycol monomethyl ether acrylate, 0.3mol CH 2 =CR-COO(CH 2 ) n-OH (R is H, n is 2) and 0.15 mol of glycidyl acrylate, fully stirred to obtain a mixed solution;
[0049] (2) Raise the temperature of the above mixture to 85°C, and add potassium persulfate aqueous solution dropwise for 2 hours. After the addition is complete, keep the temperature for 2 hours, cool to 45°C, adjust the pH to 5, and obtain a sustained-release...
Example Embodiment
[0050] Example 3
[0051] The present invention is an embodiment of a preparation method of a sustained-release polyester polycarboxylic acid water reducing agent with strong adaptability. The method described in this embodiment includes the following steps:
[0052] (1) In a 1000ml four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 500ml deionized water, 0.89mol thioglycolic acid (moles 5% of the total monomer moles), 3mol CH 2 =CH-CONR 1 R 2 (R 1 Is C 2 H 5 , R 2 Is C 3 H 7 ), 5mol sodium allyl sulfonate, 3mol polyethylene glycol monomethyl ether methacrylate, 2mol CH 2 =CR-COO(CH 2 )n-OH (R is CH 3 , N is 5) and 4mol of glycidyl methacrylate, and the mixture is obtained after fully stirring;
[0053] (2) Raise the temperature of the above-mentioned mixture to 95°C, add dropwise the aqueous solution of benzoyl peroxide, the dropping time is 3h, after the dropping is completed, the reaction is kept for 4h, the temperature is lowered to 50°C, and the ...
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