DISPERSANT POWDER CONTAINING PARTIALY ACETALIZED WATER- SOLUBLE POLYVINYL ALCOHOL, USE THEREOF, AND PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a dispersant powder capable of improving tensile adhesion strength to a hydrophobic base material of cement bonding type prepared mortar. SOLUTION: This dispersant powder contains a) at least one of base polymers selected from vinyl esters, vinyl ester comonomers, vinyl ester/ethylene, acrylic acid (methacrylic acid), and styrene/acrylic acid polymers; b) at least one of protective colloids in 1-25 wt.% calculated based on base polymers; c) at least one of partialy acetalized water-soluble polyvinyl alcohols in 1-25 wt.% calculated based on base polymers; d) a retarding admixture in 0-20 wt.% calculated based on total polymer weight; and e) other additives if necessary.