| 摘要 |
PURPOSE:To enable to effectively remove silicic scale, by forming a descaling agent from alpha-hydroxyacetic acid, polycarboxylic acid and an anion- or nonion- type surfactant. CONSTITUTION:To provide a descaling agent which can effectively silicic scale, the descaling agent is prepared as an aqueous solution such that it contains 10- 50wt% alpha-hydroxyacetic acid, 1-20wt% polycarboxylic acid or its salt and 0.1- 2wt% a surfactant such as an anion type (e.g. alkyl sulfate having a hydrophillic group such as sulfonate) or a nonion type (e.g. polyoxyethylene alkyl ether). |
