Rock bit grease composition
    379.
    发明授权
    Rock bit grease composition 失效
    岩石润滑脂组成

    公开(公告)号:US5589443A

    公开(公告)日:1996-12-31

    申请号:US576617

    申请日:1995-12-21

    Abstract: A rock bit grease composition is prepared by combining synthetic polymer lubricant basestocks comprising a first ethylene-alphaolefin polymer having an average molecular weight in the range of from 3,500 to 4,000, and a polyisobutylene polymer to form a first master. A metal complex soap base thickener is prepared by combining a synthetic polymer lubricant basestocks comprising a second ethylene-alphaolefin having an average molecular weight in the range of from 400 to 800, with an alkali-metal or alkaline-earth metal hydroxide, and at least one fatty acid. A preferred fatty acid is a blend of a first fatty acid having in the range of from 15 to 20 carbon atoms, and a second fatty acid having in the range of from 5 to 12 carbon atoms. The first master and metal complex soap base thickener are mixed together in desired proportions. Boron nitride extreme pressure agent, molybdenum disulfide lubricant additive, and copper powder anti-seize agent are added to the mixture to produce a grease composition having a Brookfield viscosity at 120.degree. C. in the range of from 600 to 750 centipoise, that is not harmful to elastomeric rock bit seals and boots, and that is free of metal lubricant additives that are toxic to humans and/or hazardous to the environment.

    Abstract translation: 通过将包含平均分子量为3,500至4,000的第一乙烯-α-烯烃聚合物和聚异丁烯聚合物的合成聚合物润滑剂基础油料组合以形成第一母料来制备岩石润滑脂组合物。 金属络合物皂基增稠剂通过将包含平均分子量为400-800的第二乙烯-α-烯烃的合成聚合物润滑剂基础油与碱金属或碱土金属氢氧化物组合,并至少 一种脂肪酸。 优选的脂肪酸是具有15至20个碳原子的第一种脂肪酸和5至12个碳原子的第二种脂肪酸的共混物。 第一个主金属和金属络合物皂基增稠剂以所需的比例混合在一起。 将氮化硼极压剂,二硫化钼润滑剂添加剂和铜粉防止剂加入到混合物中以产生在120℃下的Brookfield粘度在600至750厘泊范围内的润滑脂组合物,即不是 对弹性岩石钻头密封件和靴子有害,并且没有对人类有毒和/或对环境有害的金属润滑剂添加剂。

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