Polycarboxylate superplasticizer and preparation method thereof
A technology of water reducing agent and polycarboxylic acid, applied in the field of polycarboxylic acid water reducing agent and its preparation, can solve the problems of high bleeding rate, small slump retention value, poor comprehensive performance, etc., and achieve good comprehensive performance Effect
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Embodiment 1
[0017] The polycarboxylate water reducer provided in this example is: 320 parts of macromonomer, 30 parts of acrylic acid, 20 parts of ammonium persulfate; 6 parts of mercaptopropionic acid, 1.5 parts of sodium methacrylsulfonate, 60 parts, lye 85 parts, deionized water 1350 parts.
[0018] The preparation method of the polycarboxylate water reducer provided in this example is: weigh 320 parts of macromonomer, 30 parts of acrylic acid, 20 parts of ammonium persulfate, 6 parts of mercaptopropionic acid and 1250 parts of deionized water according to a certain mass, and stir Heating to a temperature of 40°C; adding deionized water to acrylic acid and mercaptoacrylic acid respectively to prepare acrylic acid aqueous solution and ammonium persulfate aqueous solution with a concentration of 20%-60%, and adding it dropwise at a constant speed in step (1). The time is 2.5h; after adding 85 parts of lye, stir and keep warm for 1h. Finally, add 92 parts of deionized water.
Embodiment 2
[0020] The polycarboxylate water reducer provided in this example is: 330 parts of macromonomer, 31 parts of acrylic acid, 22 parts of ammonium persulfate; 7 parts of mercaptopropionic acid, 2 parts of sodium methacrylsulfonate, 70 parts, 88 parts lye, 1400 parts deionized water.
[0021] The preparation method of the polycarboxylate water reducer provided in this example is: weigh 330 parts of macromonomer, 31 parts of acrylic acid, 22 parts of ammonium persulfate, 70 parts of mercaptopropionic acid and 1300 parts of deionized water according to a certain mass, and stir Heating to a temperature of 50°C; adding acrylic acid and mercaptoacrylic acid to deionized water respectively to prepare acrylic acid aqueous solution and ammonium persulfate aqueous solution with a concentration of 50%, and adding it dropwise at a constant speed in step (1), and the dropping time is 2.5 h; After adding 88 parts of lye, stir and keep warm for 1h. Finally, add 100 parts of deionized water.
Embodiment 3
[0023] The polycarboxylate water reducer provided in this example is: 360 parts of macromonomer, 38 parts of acrylic acid, 24 parts of ammonium persulfate; 9 parts of mercaptopropionic acid, 2.5 parts of sodium methacrylsulfonate, 70 parts, 90 parts lye, 1500 parts deionized water.
[0024] The preparation method of the polycarboxylate water reducer provided in this example is: weigh 360 parts of macromonomer, 38 parts of acrylic acid, 24 parts of ammonium persulfate, 70 parts of mercaptopropionic acid and 1300 parts of deionized water according to a certain mass, stir Heating to a temperature of 50°C; adding deionized water to acrylic acid and mercaptopropylene respectively to prepare acrylic acid aqueous solution and ammonium persulfate aqueous solution with a concentration of 55%, and adding dropwise at a constant speed in step (1), and the dropping time is 2.5 h; After adding 88 parts of lye, stir and keep warm for 1h. Finally, add 100 parts of deionized water.
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Abstract
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