Study on the Influence of Shield Tail Sealing Grease on Rubber Property
Using EPDM as the test material,the effect of shield tail sealing grease on the rubber property was studied.The EPDM was impregnated with shield tail sealing grease for7 d,14 d,21 d and31 d under normal temperature(23±2)℃,and was impregnated with shield tail sealing grease under aging 70℃×96 h,respectively.The influence of shield tail sealing grease on rubber properties was characterized by the index values of hardness,tensile strength and elongation at break.The results show that the grease has corrosive effect on rubber properties under three mechanical indicators.With the increase of impregnation age,the loss of rubber properties is greater,and the loss of rubber properties is more obvious under aging conditions.It is suggested that the shield tail sealing grease immersion under the aging condition has been used as the testing condition,and the indexes and limits for evaluating the corrosivity of shield tail sealing grease to rubber are:hand coated type hardness loss≤10 degrees,tensile strength reduction≤30%,elongation at break reduction≤25%,and pumped type hardness loss≤10 degrees,tensile strength reduction≤40%,elongation at break reduction≤30%.
shield tail sealing greaserubber agingEPDMtensile strengthelongation at breakhardness(Shore A)
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