Study Of Cold Endurance On Reducing Vibration Rubber Products

The variation rate of the rubber buffer stiffness at low temperature wasdecreased. The difference of five types of testing methods for the rubber lowtemperature performance was studied and the addition agent influence onelastic modulus of nature rubber at low temperature were also studied. Therubber with excellent resistance to cold and oil was obtained by using NBRwith the content of19%acrylonitrile.The properties of low temperature crystallization for the rubber bufferwas studied by testing the coefficient of compression of cold resistance in30minutes. The results showed that the properties of cold resistance wasexcellent when the system of raw rubber was blended with15phr BR and theproperties of cold resistance of the traditional vulcanization system was betterthan the effective vulcanization system. The vulcanization system withaccelerator A had better properties of cold resistance. The variation rate of therubber buffer stiffness at low temperature was decreased from50percent to8percent.The results at five types of low temperature testing methods showed thatthe brittleness temperature obtained by single specimen method was2-4℃lower than the multiple specimen method. And the glass transition temperature determined by DSC was1-7℃lower than the DMTAresult.The variation rate of modulus at low temperature and glass transitiontemperature was studied by DMTA. The results showed that the variation rateof modulus at low temperature was consistent with the variation of glasstransition temperature in the five raw rubber systems. The low sulfur and highaccelerator system had the lowest variation rate of the elastic modulus at lowtemperature. And the semi-efficient Vulcanization had the lowest glasstransition temperature among five raw rubber systems.The oil resistance and cold resistance performance of the rubber wascharacterized by the weight maintenance rate and the-50℃compressionmodulus. The results showed that it had better performance when the rubberwas mixed with NBR of23%acrylonitrile. The peroxide vulcanization systemand DOS plasticizer had better oil and cold resistance performance. The rawrubber with NBR/BR=80/20had relative better oil and cold resistanceperformance.