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    • 9. 发明申请
    • LUBRICANTS WITH ENHANCED THERMAL CONDUCTIVITY CONTAINING NANOMATERIAL
    • 具有增强的包含纳米材料的热导率的润滑剂
    • WO2005060648A3
    • 2006-10-05
    • PCT/US2004042109
    • 2004-12-16
    • ASHLAND INCZHANG ZHIQIANGWU GEFEILOCKWOOD FRANCES E
    • ZHANG ZHIQIANGWU GEFEILOCKWOOD FRANCES E
    • C10M169/04C10M125/02
    • C10M125/02C10N2230/02C10N2240/042C10N2250/10C10N2250/12
    • A lubricant composition having an enhanced thermal conductivity, up to 80% greater than its conventional analogues, and methods of preparation for these fluids are identified. One preferred composition contains a base oil, nanomaterial, and a dispersing agent or surfactant for the purpose of stabilizing the nanomaterial. One preferred nanomaterial is a high thermal conductivity graphite, exceeding 80W/m-K in thermal conductivity. The graphite is ground, milled, or naturally prepared to obtain a mean particle size less than 500 nm (nanometer) in diameter, and preferably less than 100 nm, and most preferably less than 50 nm. The graphite is dispersed in the fluid by one or more of various methods, including ultrasonication, milling, and chemical dispersion. Carbon nanostructures such as nanotubes, nanofibrils, and nanoparticles are another type of graphitic structure useful in the present invention. Other high thermal conductivity carbon materials are also acceptable. To confer long-term stability, the use of one or more chemical dispersants or surfactants is useful. The thermal conductivity enhancement, compared to the fluid without graphite, is proportional to the amount of nanomaterials added. The graphite nanomaterials contribute to the overall fluid viscosity, partly or completely eliminating the need for viscosity index improvers and providing a very high viscosity index. Particle size and dispersing chemistry is controlled to get the desired combination of viscosity and thermal conductivity increase from the base oil while controlling the amount of temporary viscosity loss in shear fields. The resulting fluids have unique properties due to the high thermal conductivity and high viscosity index of the suspended particles, as well as their small size.
    • 确定具有比其常规类似物高达80%的增强导热性的润滑剂组合物以及这些流体的制备方法。 一种优选的组合物包含基础油,纳米材料和用于稳定纳米材料的分散剂或表面活性剂。 一种优选的纳米材料是导热率高于80W / m-K的高导热性石墨。 将石墨研磨,研磨或天然制备以获得直径小于500nm(纳米),优选小于100nm,最优选小于50nm的平均粒度。 石墨通过一种或多种各种方法分散在流体中,包括超声波处理,研磨和化学分散。 诸如纳米管,纳米原纤维和纳米颗粒的碳纳米结构是本发明中有用的另一种石墨结构。 其他高导热性碳材料也是可以接受的。 为了赋予长期稳定性,使用一种或多种化学分散剂或表面活性剂是有用的。 与没有石墨的流体相比,热导率增加与添加的纳米材料的量成比例。 石墨纳米材料有助于整体流体粘度,部分或完全消除了对粘度指数改进剂的需求并提供非常高的粘度指数。 控制颗粒尺寸和分散化学性质,以获得与基础油的粘度和热导率增加的期望组合,同时控制剪切场中的临时粘度损失量。 所得到的流体由于悬浮颗粒的高导热性和高粘度指数以及它们的小尺寸而具有独特的性质。