LOW-TEMPERATURE METHOD FOR PREPARING HIGH-ADAPTABILITY ETHER POLYCARBOXYLIC ACID WATER REDUCER

摘要

Disclosed is a low-temperature method for preparing high-adaptability ether polycarboxylic acid water reducer. The method comprises the following steps: formulating unsaturated carboxylic acid, unsaturated sulfonate, unsaturated phosphonic acid, a chain transfer agent and water into a mixed solution A; formulating reducing agent C and water into a mixed solution B; adding unsaturated polyoxyethylene ether, buffering agent and water into a reaction vessel; adjusting the reaction temperature to 10-40 ℃, adding an oxidant at one time, and dissolving by stirring; respectively and simultaneously dropping the mixed solution A and mixed solution B; at the end of the dropping, adding 0-0.5 parts of reducer D at one time, continuously reacting for 1-2 hours; and adding 10-20 parts of 30wt% sodium hydroxide solution to neutralize, thereby obtaining the polycarboxylic acid water reducer. The method of the present invention is simple. The prepared water reducer can have high dispersibility by low doping amount. The low-temperature high-efficiency reducer is introduced to implement low-temperature polymerization of the polycarboxylic acid, thereby enhancing the conversion rate of the product..