| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubrication method with which contamination of surrounding environment of seawater, etc., is prevented in lubrication around sliding parts of a ground treatment machine of the sea bottom. SOLUTION: The lubrication method comprises using biodegradable grease that has a high density and is sedimented in sea water. The grease, for example, comprises a biodegradable base oil, a thickening agent and a specific gravity adjuster. COPYRIGHT: (C)2007,JPO&INPIT |
