Polycarboxylic acid type water reducer and preparation method thereof

2015 
The invention provides a polycarboxylic acid type water reducer and a preparation method thereof. The technical scheme adopted by the invention is as follows: the polycarboxylic acid type water reducer has a general structural formula defined in the specification, wherein m, n, x, y and z represent degree of polymerization, data ranges are as follows: m is equal to 1 to 6, n is equal to 11 to 39, x is equal to 2 to 9, y is equal to 4 to 18, z is equal to 6 to 18, and the molecular weight range is 10,000 to 55,000. The preparation method for the polycarboxylic acid type water reducer comprises the following steps: by taking acrylamide, acrylic acid, acrylic polyethylene glycol monomethyl ether ester and sodium methallyl sulfonate as monomers and taking de-ionized water as a solvent, dropwise adding a de-ionized aqueous solution of an initiator and a de-ionized aqueous solution of the monomers under the nitrogen protection at the same time respectively, producing a copolymerization reaction, and regulating the pH value of a system to be 6 to 8 after the reaction is ended to obtain the polycarboxylic acid type water reducer. The polycarboxylic acid type water reducer prepared with the method has high water-reducing rate and good slump retention capability.
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