ビスカスカップリングオイルの開発(第2報) ジメチルシリコーンオイルのゲル化機構:ジメチルシリコーンオイルのゲル化機構  [in Japanese] Development of Viscous Coupling Oil(Part 2). Gelation Mechanism of Dimethylsilicone Oil.:Gelation Mechanism of Dimethylsilicone Oil  [in Japanese]

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Abstract

ビスカスカップリングオイルの中で, ジメチルシリコーンオイルはプレートの摩擦や摩耗粉に起因してゲル化すると推定される。これを検証し, その反応機構を明らかにすることを目的とした。実機台上試験および熱酸化安定度試験での試験後オイルや発生ガスの分析を行うとともに, 摩擦試験による粘度変化を調べ, 酸化反応および摩擦の要因について詳細に検討した。この結果, ジメチルシリコーンオイルはトライボケミカル反応によりゲル化し, この反応は窒化鉄の存在により促進されることがわかった。また, ゲル化防止に有効な特定の極圧剤の主な作用機構は窒化鉄の不活性化にあることを明らかにした。

Reliability of viscous couplings depends on the stability of the oil. Realizing this fact, the authors made studies on stabilities of dimethylsilicone oils used as viscous coupling oils. In our previous report, it was suggested that gelation has to do with the friction of the plates in viscous coupling. However, there is still no clear understanding of the reaction mechanism of gelation of dimethylsilicone oils.<br>Gelling and the increase in viscosity as regards viscous coupling has been investigated using laboratory heat and friction tests, and a series of analyses of oils tested and gases evolved has been carried out in order to clarify the mechanism.<br>The results may be summarized as follows:<br>(1) It could reasonably be assumed that gelation of dimethylsilicone oils in viscous coupling is not due to the crosslinking by oxidation because of the leanness of oxygen. Therefore, the laboratory heat test is not suitable for examining the gelation of viscous coupling oils.<br>(2) In the laboratory friction test, the increase in viscosity proceeds at 40 to 100°C and is accelerated in the presence of Fe<i><sub>x</sub></i>N. A satisfactory correlation between the increase in viscosity in the friction test and the torque change in the accelerated viscous coupling test is obtained.<br>(3) From these experimental results, it is obvious that gelation in viscous coupling is due to the extraordinary reaction, namely, "tribo-chemical" reaction, which occurs at the interface between the metal surfaces of the plates under friction. Fe<i><sub>x</sub></i>N accelerates the tribochemical reaction of dimethylsilicone oils.<br>(4) The major role of specified EP-agents is to inhibit gelation by deactivating Fe<i><sub>x</sub></i>N.<br>(5) It is proposed that a branched polymer consisting of the main and side chains of polydimethylsiloxane is produced by tribo-chemical reaction without oxygen and a highly branched polymer becomes a gel by forming a three dimensional network.

Journal

  • Journal of The Japan Petroleum Institute

    Journal of The Japan Petroleum Institute 37(3), 270-277, 1994

    The Japan Petroleum Institute

Codes

  • NII Article ID (NAID)
    130003583954
  • Text Lang
    JPN
  • ISSN
    0582-4664
  • Data Source
    J-STAGE 
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