| 摘要 |
PROBLEM TO BE SOLVED: To provide a scaling inhibitor having a excellent deposition suppressing effect of scale, particularly silica scale in a water system such as a cooling water system, and a method for preventing scaling in the water system. SOLUTION: The scaling inhibitor contains a water-soluble copolymer comprising monomer units of a phosphonic acid and/or its salt and at least (meth)acrylic acid and/or its salt, monomer units of a (meth)acrylamide-alkylsulfonic acid and/or a (meth)acrylamide-arylsulfonic acid and/or its salt and a monomer unit of a substituted (meth)acrylamide. It is also preferable that an azole compound and a bacteria suppressor are further added to the scaling inhibitor if necessary.
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