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|1. (WO2013147112) METHOD FOR TREATING COOLING WATER SYSTEM|
|Applicants:||KURITA WATER INDUSTRIES LTD.
NIPPON SHOKUBAI CO., LTD.
|Title:||METHOD FOR TREATING COOLING WATER SYSTEM|
A method for treating a cooling water system which has a calcium hardness of 300 mg/L or higher in terms of CaCO3 amount and a concentration of chloride ions and/or sulfate ions of 1,000 mg/L or higher, the method comprising adding a treating agent containing a (meth)acrylic acid-based copolymer to the cooling water system, wherein the (meth)acrylic acid-based copolymer comprises structural units (a) derived from a (meth)acrylic acid monomer (A) and structural units (b) derived from a specific (meth)allyl ether monomer (B), the contents of the structural units (a) and the structural units (b) being 80-90 mol% and 10-20 mol%, respectively, per 100 mol% all the monomer-derived structural units, and the (meth)acrylic acid-based copolymer has a sulfonic acid group or a salt thereof as at least one of the terminals of the backbone thereof.