Preparation method of viscosity-reduction type polycarboxylate water reducer
A technology of viscous polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures in building materials, can solve the problems of high viscosity, achieve high dispersion, obvious viscosity reduction effect, and good adaptability
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[0025] Example 1
[0026] 1) Put 100 parts of methylalkenyl polyoxyethylene ether (molecular structure see general formula 1, n=50) into the bottom of the kettle, add 100 parts of deionized water, heat to 60℃, stir to dissolve, and then put in butyl acrylate 10 70 parts of random polyoxyethylene oxypropylene ether acrylate (see general formula 1 for molecular structure, m=50, q=10, z=0), stir well;
[0027] 2) Control the temperature at 60°C, add 3.5 parts of potassium persulfate to the kettle and stir for 10 minutes;
[0028] 3) The temperature is controlled at 60°C, and a mixed solution containing 15 parts of acrylic acid, 1.2 parts of mercaptoethanol and 15 parts of deionized water is added dropwise for 3 hours;
[0029] 4) Continue to keep warm for 2h
[0030] 5) Cool down to 35℃~40℃, and add 30% liquid caustic soda to neutralize, adjust the pH to 5. Dilute with water to a concentration of 40% to obtain the product of the present invention VPC-1.
Example Embodiment
[0031] Example 2
[0032] 1) Put 100 parts of methylalkenyl polyoxyethylene ether (molecular structure see general formula 1, n=50) into the bottom of the kettle, add 100 parts of deionized water, heat to 60℃, stir to dissolve, and then put in butyl acrylate 5 70 parts of methoxy random polyoxyethylene oxypropylene ether acrylate (see general formula 1 for molecular structure, m=50, q=20, z=0), stir well;
[0033] 2) Control the temperature at 60°C, add 3.5 parts of potassium persulfate to the kettle and stir for 10 minutes;
[0034] 3) The temperature is controlled at 60°C, and a mixed solution containing 15 parts of acrylic acid, 1.2 parts of mercaptoethanol and 15 parts of deionized water is added dropwise for 3 hours;
[0035] 4) Continue to keep warm for 2h
[0036] 5) Cool down to 35℃~40℃, and add 30% liquid caustic soda to neutralize, adjust the pH to 5. Dilute with water to a concentration of 40% to obtain the product of the present invention VPC-2.
Example Embodiment
[0037] Example 3
[0038] 1) Put 100 parts of methylalkenyl polyoxyethylene ether (molecular structure see general formula 1, n=50) into the bottom of the kettle, add 100 parts of deionized water, heat to 60℃, stir to dissolve, and then put in butyl acrylate 5 70 parts of methoxy random polyoxyethylene propylene oxide butenyl ether acrylate (see general formula 1 for molecular structure, m=50, q=20, z=20), stir evenly;
[0039] 2) Control the temperature at 60°C, add 3.5 parts of potassium persulfate to the kettle and stir for 10 minutes;
[0040] 3) The temperature is controlled at 60°C, and a mixed solution containing 15 parts of acrylic acid, 1.2 parts of mercaptoethanol and 15 parts of deionized water is added dropwise for 3 hours;
[0041] 4) Continue to keep warm for 2h
[0042] 5) Cool down to 35℃~40℃, and add 30% liquid caustic soda to neutralize, adjust the pH to 5. Dilute with water to a concentration of 40% to obtain the product of the present invention VPC-3.
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