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1. (WO2013147112) METHOD FOR TREATING COOLING WATER SYSTEM

Pub. No.:    WO/2013/147112    International Application No.:    PCT/JP2013/059451
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Sat Mar 30 00:59:59 CET 2013
IPC: C02F 5/10
C02F 5/00
C08F 216/14
C08F 220/04
C23F 11/16
F28G 9/00
Applicants: KURITA WATER INDUSTRIES LTD.
栗田工業株式会社
NIPPON SHOKUBAI CO., LTD.
株式会社日本触媒
Inventors: NISHIDA, Ikuko
西田 育子
FUJITA, Kazuhisa
藤田 和久
MURANO, Yasushi
村野 靖
NAKANO, Masato
中野 真人
SANO, Yuki
佐野 友紀
Title: METHOD FOR TREATING COOLING WATER SYSTEM
Abstract:
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.