PRODUCTION OF WATER REDUCING AGENT

摘要

PURPOSE: To efficiently and simply obtain a calcium salt type water reducing agent from the existing water reducing agent as a starting material without damaging water reducing performance and long period stability by passing a water reducing agent aqueous solution for alkali component-containing raw material through a column filled with calcium type cation exchange resin. CONSTITUTION: The water reducing agent for Na and/or K-containing raw material is passed through the column filled with the Ca type cartion exchange resin and Na and/or K contained in the aqueous solution is exchanged with Ca ions in the exchange resin and the water reducing agent aqueous solution is produced. A melamine based water reducing agent being a sulfonate aqueous solution of a melamine formaldehyde condensation product is most preferable as the using water reducing agent aqueous solution for the raw material. These water reducing agent aqueous solutions containing 1.0-6.0wt.% Na and/or K and have 2-800mPa. s viscosity, when solution is passed through the column filled with the Ca type cation exchange resin.