Development of Viscous Coupling Oil(Part 2). Gelation Mechanism of Dimethylsilicone Oil.

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Other Title
  • 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
  • Gelation Mechanism of Dimethylsilicone Oil
  • ジメチルシリコーンオイルのゲル化機構

Abstract

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 FexN. 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. FexN accelerates the tribochemical reaction of dimethylsilicone oils.<br>(4) The major role of specified EP-agents is to inhibit gelation by deactivating FexN.<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.

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