Research On Application Of Hydrogenated Nitrile Rubber In Sealing Ring For Oil Cooler Of Automobile Engine

In recent years,with the rapid development of the automobile industry and the continuous tightening of emission regulations,as electronic fuel injection devices,turbocharging technology and exhaust gas aftertreatment systems have been promoted and applied in automobile engine systems,the design of fuel efficiency and engine speed has improved With the continuous increase,the internal temperature and pressure of the engine also continue to increase,which brings a higher risk of aggravated internal friction.Coupled with the popular use of synthetic engine oil and the increase in grade,such "bad" working conditions are cooling the vehicle oil.The sealing reliability of the seal ring of the device puts forward higher requirements.In view of this,in addition to meeting higher mechanical strength and other mechanical performance indicators,the rubber used in this type of product must also have stronger heat aging performance and high temperature oil aging resistance.Performance,especially lower reliability requirements such as compression set resistance.HNBR has excellent heat resistance,ozone resistance and high temperature compression permanent deformation properties;at the same time,in terms of mechanical properties,it also has high strength,high tear performance and excellent wear resistance.Lubricating oils with polar additives also have a good resistance type.Therefore,compared to materials such as NBR,CR,FKM,etc.,they are more suitable for the manufacture of such products and are highly regarded at home and abroad.This research work is based on the customer’s "pain point" of the "engine full-speed and full-load 1000 h durability test oil cooler sealing ring leakage event".After careful investigation of the working conditions,starting from the performance characteristics of the HNBR material,the main body of the HNBR Material chemical structure,molecular chain type and technical indicators,peroxide system cross-linking aid category,peroxide curing agent dosage for its unvulcanized rubber characteristics and vulcanization characteristics and conventional mechanical properties of vulcanized rubber,high temperature air resistance,In-depth research on the influence rules of oil compression set performance,heat-resistant air aging performance,and high-temperature oil aging performance,combined with previous research and development experience,completed the system optimization of its matching system,under the premise of meeting product process performance,To further improve the conventional mechanical properties of the material,and at the same time to achieve a greater improvement in its resistance to high temperature air aging,high temperature oil aging,especially high temperature,oil compression permanent deformation performance.In the aspect of oil cooler seal ring manufacturing,this research work optimizes its manufacturing process from the aspects of compound rubber preparation,rubber blank molding,primary vulcanization molding,and secondary vulcanization shaping.From the perspective of cost and efficiency,an internal mixer is used to prepare the rubber compound;from the perspective of quality and cost,the film cutting process is used;from the perspective of reducing the scrap rate,the vacuum vulcanizing machine is used for the primary vulcanization molding,and the secondary vulcanization molding is automatically controlled.The temperature system controls the high temperature oven.Finally,after product verification,the performance indicators of the HNBR material prepared with the optimized formula meet the requirements of the technical standard indicators of the product materials.The two oil cooler seals manufactured have passed the customer’s full-speed full-load 1000 h durability test,and The research results on the long-term high-temperature oil compression permanent deformation of the product provide an effective reference index for the timeliness of the subsequent oil cooler seal durability reliability test,and provide a basis for the customer to quickly determine the product quality in the later period.