| 摘要 |
PURPOSE:To obtain an obstruction preventive agent capable of effectively preventing the obstruction due to the corrosion and the scale formation generated in a water system by incorporating carbohydrazide into the obstruction preventive agent of the water system as an essential component. CONSTITUTION:Into an effective amt. of carbohydrazide, other corrosion inhibitor and/or a descaling agent are incorporated to prepare an obstruction preventive agent. A chemical agent for iron such as polymerized phosphate, phosphoric acid (salt), zinc salt, molybdic acid (salt), and a low-molecular polymer of carboxylic acid can be used as said other corrosion inhibitor and descaling agent. A chemical agent for copper such as an azole compd. can be mentioned as the corrosion inhibitor. The mere addition of a soln. of the obstruction preventive agent to the water system is enough as the actual treatment. The amt. of carbohydrazide to be added to the water system is regulated to 0.1-1,000ppm. |
