Manufacturing method of high range water reducing agent having polycarboxylic acid group

摘要

The present invention provides a method for producing a polycarboxylic acid-based water reducing agent for concrete mixing, comprising 54 parts by weight of ion-exchanged water as an initial polymerization solvent, 93.5 parts by weight of acrylic acid as monomer, 10.0 parts by weight of ethyl acrylic acid, 7.5 parts by weight of methyl methacrylate, 2.5 parts by weight of 2-acrylamido-2-methylpropane sulfonic acid and 1.5 parts by weight of n-dodecylmercaptan as a molecular weight modifier, 5.0 parts by weight of ammonium persulfate and 50 parts by weight of ion-exchanged water as a initiator solution and a cocatalyst solution After mixing and aging at 90 ° C using a solution of 6.5 parts by weight of hydroperoxide (35%) and 20 parts by weight of ion-exchanged water, the mixture was neutralized to pH 7 using 60 parts by weight of 50% sodium hydroxide. A method for producing a carboxylic acid-based high performance water reducing agent.;The method of the present invention has the effect of producing a high performance water reducing agent having a solid content of 44% and a viscosity of 1000 cps or less by an economical and environmentally friendly method that does not use isopropyl alcohol as a polymerization solvent.