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    • 26. 发明公开
    • Conducting polymer-thickened grease compositions
    • Leitfähigepolymerverdickte Schmierfettzusammensetzungen
    • EP0795598A1
    • 1997-09-17
    • EP97200670.4
    • 1997-03-06
    • SKF Industrial Trading & Development Co, B.V.
    • Wan, George Tin YauMeijer, Dick
    • C10M119/02C10M169/06
    • C10M119/02C10M125/02C10M125/04C10M125/22C10M169/06C10M2201/041C10M2201/042C10M2201/05C10M2201/065C10M2201/066C10M2201/084C10M2205/00C10M2205/006C10M2205/0213C10M2205/024C10M2205/046C10M2205/066C10M2205/086C10M2205/106C10M2205/126C10M2205/146C10N2220/02C10N2240/00C10N2240/201C10N2240/202C10N2240/22C10N2240/30C10N2240/50C10N2240/52C10N2240/54C10N2240/56C10N2240/58C10N2240/60C10N2240/66
    • An electrically conducting polymer thickened grease composition is provided, comprising

      1) a lubricating base oil
      2) a polymer thickener
      3) an electrically conducting component
      4) further additives known per se,
      characterised in that the polymeric thickener comprises a mixture of (1) a (co- or homo-)polymer of propylene with a weight average molecular weight > 200.000 and (2) a (co- or homo-)polymer of propylene with a weight average molecular weight
      The electrically conducting component is preferably chosen from metal containing additives, especially organo metallic/organo bismuth compounds; anti-static agents, or electrically conducting solids, such as soft metal particles, silver, copper, graphite, bismuth or niobium (IV) sulfide.
      The grease composition can conduct electricity through the parts of a roller bearing, not only under static conditions, but also during use; this makes the greases especially suited for use in roller bearings with rotating electrical contacts, such as described in SKF's US patent 5 139 425.
      The grease can further reduce or prevent the build-up of static electricity and spark formation in roller bearings.
      The grease is prepared by mixing/dissolving the melted polymer thickener with/in a lubricating base oil and incorporating the electrically conducting component and the further additives.
      After that, the grease composition is cooled from the mixing temperature to room temperature, preferably by "quenching", i.e. rapid cooling within around 30 seconds. After that the grease can be worked to the required consistency.
      The invention further relates to the use of a polymeric thickener in a preparation of an electrically conducting lubricant grease composition.
    • 提供导电聚合物增稠的润滑脂组合物,其包含1)润滑基础油2)聚合物增稠剂3)导电组分4)本身已知的其它添加剂,其特征在于,所述聚合物增稠剂包含(1) (共聚或均聚)丙烯的重均分子量> 200.000的聚合物和(2)重均分子量<100.000的丙烯(共聚或均聚)聚合物。 。 导电组分优选选自含金属的添加剂,特别是有机金属/有机铋化合物; 抗静电剂或导电固体,例如软金属颗粒,银,铜,石墨,铋或铌(Ⅳ)硫化物。 润滑脂组合物可以不仅在静态条件下,而且在使用过程中都能通过滚子轴承的部件进行通电; 这使得特别适用于具有旋转电触头的滚子轴承的润滑脂,如SKF的美国专利5 139 425中所述。润滑脂可以进一步减少或防止滚动轴承中的静电和火花形成。 通过将熔融的聚合物增稠剂与润滑基础油混合/溶解并掺入导电组分和其它添加剂来制备润滑脂。 之后,将润滑脂组合物从混合温度冷却至室温,优选通过“淬火”冷却,即在约30秒内快速冷却。 之后,可以将润滑脂加工成所需的一致性。 本发明还涉及聚合物增稠剂在制备导电润滑剂润滑脂组合物中的用途。