CEMENT COMPOSITION ADDITIVE INCLUDING POLYCARBOXYLIC COPOLYMER AND METHODE FOR PREPARING THE SAME

摘要

The present invention relates to a cement composition additive including polycarboxylic copolymer and/or salt thereof. The polycarboxylic copolymer includes an alkoxy polyalkylene glycol mono(meta)acrylic acid ester-based monomer with an average additional mole number of oxyalkylene group of an integer of 40 to 100 and a (meta)acrylic acid-based monomer. A polymerization initiator of the polycarboxylic copolymer is a copolymer included at 0.5 wt% to 5 wt% with respect to the total weight of the monomer mixture, the polymerization temperature of the polycarboxylic copolymer being 10°C to 50°C, and polymerized in a condition of a hydrogen ion concentration (pH) of 4 to 11.