GREASE COMPOSITION

PROBLEM TO BE SOLVED: To provide a water resistant urea-based grease composition of which the grease structure is hardly broken under used environment where water is mixed with the grease and of which the lubrication life can extend by maintaining a lubrication film stable even when water is mixed w...

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Bibliographic Details
Main Authors FUJIMAKI YOSHITOMO, TANAKA KEIJI
Format Patent
LanguageEnglish
Japanese
Published 27.07.2017
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Summary:PROBLEM TO BE SOLVED: To provide a water resistant urea-based grease composition of which the grease structure is hardly broken under used environment where water is mixed with the grease and of which the lubrication life can extend by maintaining a lubrication film stable even when water is mixed with the grease by stirring.SOLUTION: The grease composition is provided that contains: an urea compound as a thickener; a base oil; alkali earth metal salicylate and/or alkali earth metal phenate, as a first component of an additive; metal soap which is metal stearate, as a second component of the additive; and calcium sulfonate and/or zinc naphthenate as a third component of the additive. The grease composition is provided that preferably contains further alkyl organic acid and/or alkyl organic ester. The grease composition is provided in which the urea compound of the thickener is preferably diurea or tetraurelia.SELECTED DRAWING: None 【課題】水がグリース中に混入する使用環境下において、グリース構造が破壊し難く、且つ、攪拌により水がグリース中に混入した場合においても安定した潤滑膜を維持することにより、潤滑寿命が延長できる耐水性ウレア系グリース組成物の提供。【解決手段】増ちょう剤として、ウレア化合物と、基油と、添加剤の第一成分として、アルカリ土類金属サリシレート、及び/又は、アルカリ土類金属フェネートと、添加剤の第二成分として、金属ステアレートである金属石けんと、添加剤の第三成分として、カルシウムスルホネート、及び/又は、亜鉛ナフテネートとを含有するグリース組成物。更にアルキル有機酸及び/又はアルキル有機酸エステルを含有することが好ましいグリース組成物。前記増ちょう剤のウレア化合物がジウレア又はテトラウレアであることが好ましいグリース組成物。【選択図】なし
Bibliography:Application Number: JP20160011009