Preparation method of concrete polycarboxylate water-reducer at normal temperature

The invention discloses a method for preparing concrete polycarboxylate water-reducer at normal temperature without heating or using organic solvent. The preparation method comprises the following steps that: a. unsaturated polyoxyethylene is dissolved into water, added with comonomer, molecular weight regulator and oxidant, stirred and mixed uniformly; b. reducer and the rest comonomer are dripped to be polymerized; and c. sodium hydroxide solution is added to be neutralized and cured. The polycarboxylate water-reducer of the invention adopts a radical polymerization method and takes water as the solvent. A whole synthesis process does not need heating, does not use organic solvent, saves energy and does not produce pollution. The preparation method of the concrete polycarboxylate water-reducer at normal temperature can solve the heating and the temperature control problems in the past polycarboxylate water-reducer production, reduces the use of fuel so that the polycarboxylate water-reducer becomes a real clean and environmental-firendly product, is a novel process method, can be applied to industrial production in a large scope, and brings considerable economic benefit.