| 摘要 |
PROBLEM TO BE SOLVED: To provide a reduction effect-keeping type method for reducing frictional resistance in piping of a water-based heat carrying medium, in which increase of a flow rate and reduction of pump power can be expected over a long period by excellent frictional resistance-reducing effect in piping, and having low toxicity and less environmental load when a frictional resistance- reducing agent is discarded. SOLUTION: The reduction effect-keeping type frictional resistance-reducing agent in piping is obtained by combining (a) an amine oxide type nonionic surfactant alone or a mixture of two or more of amine oxide type nonionic surfactants and (b) a betaine type amphoteric surfactant alone or a mixture of two or more of betaine type amphoteric surfactants with (c) an aromatic carboxylic acid salt alone or two or more of aromatic carboxylic acid salts. Persistency of frictional resistance-reducing effect in piping can be improved by adding the agent into piping. COPYRIGHT: (C)2004,JPO
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