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The effect of adding polymers with different structures to lithium grease (mineral oil-based and vegetable oil-based) was studied. The addition of polymer into grease significantly improved its performance, especially water resistance and shear stability. By adding 1% of a high molecular weight polyisoprene in a vegetable oil-based grease, the weight loss percentage of the grease in water spray test decreased from 83 to 17%. The addition of 1% ethylene/propylene copolymer in a mineral oil-based grease decreased the weight loss percentage from 73 to 15%. Due to the chemistry difference between mineral oils and vegetable oils, the compatibility of polymer with base fluid varied from the chemical structure. Thus, some polymers working for mineral oil-based grease do not work well in vegetable-based grease.


Trademark
Mitsubishi Plastics Inc. and Functional Products Inc. | Date: 2006-05-01

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Trademark
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Trademark
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