Method for preparing polycarboxylate water reducer by normal temperature mixing method
A technology of polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of increased transportation costs and reduced profits, and achieves the effects of short production cycle, avoidance of violent aggregation, and low energy consumption
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[0022] (1) Put 100kg of polyether macromonomer isopentenol polyoxyethylene ether, 100kg of water, 10kg of acrylic acid, 2kg of 2-acrylamide-2-methylpropanesulfonic acid, and 3kg of potassium persulfate into the reaction vessel in turn, and turn on the pump The circulation device makes all the raw materials dissolve.
[0023] (2) Put 1 kg of pre-dissolved sodium bisulfite and 0.4 kg of mercaptopropionic acid into the reaction vessel at one time, start the reaction, and close the pump circulation device. The system maintains the reaction by its own redox reaction exotherm, and the temperature reaches the highest point within 0.5-1.5 hours of the reaction, and continues to keep warm for 3 hours after reaching the highest temperature point.
[0024] (3) Add liquid caustic soda for neutralization, turn on the pump circulation device and mix for 5 minutes to obtain a polycarboxylate superplasticizer with a concentration of 40%.
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