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Breakdown of polyisobutene during operation of thickened oils in a gearbox

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Chemistry and Technology of Fuels and Oils Aims and scope

Summary

  1. 1.

    A study has been made of the mechanical breakdown of solutions of 18, 200, 8300, and 5300 molecular weight polyisobutenes and of a 16,000 molecular weight isobutene-styrene copolymer. It has been shown that the lower the molecular weight of the polymer, the less the degree of breakdown.

  2. 2.

    As the operating time increases, the rate of mechanical breakdown drops off; this is related to the decrease in the number of dissolved polymer molecules that are susceptible to breakdown under the given conditions.

  3. 3.

    Under constant breakdown conditions, the molecular weight of polyisobutene is reduced to approximately the same level, regardless of the original molecular weight.

  4. 4.

    Under boundary lubrication conditions, the rate of mechanical breakdown of polymers depends on the angular velocity of the gears but is practically independent of gear tooth load.

  5. 5.

    The production of polyisobutene-compounded automatic transmission oils that are stable against mechanical breakdown is possible if polymers of 5000–8000 molecular weight are used.

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Authors
  1. G. I. Kichkin
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  2. K. I. Klimov
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Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 8, pp. 49–53, August, 1966.

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Kichkin, G.I., Klimov, K.I. Breakdown of polyisobutene during operation of thickened oils in a gearbox. Chem Technol Fuels Oils 2, 569–572 (1966). https://doi.org/10.1007/BF00719214

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  • DOI: https://doi.org/10.1007/BF00719214

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