Preparation Of Ethylene-Propylene Copolymer Lubricant Viscosity Index Improver

With the development of machine-building industry and requirements of environmental protection and energy-saving, the demands on the performance of lubricants oil are higher and higher. In order to meet the needs of this demanding, the lubricant additive technology has developed rapidly. In recent years, the viscosity index improve are widely used in multi-level oil. It is generally oil-soluble polymer, when added to the base oil, it can increase the oil viscosity and improve oil viscosity index. Therefore, the multi-level engine oil that prepared with viscosity index improver has good viscosity-temperature performance and low-temperature startup performance.At present, there are two types of lubricating oil viscosity index improvers: single-effect viscosity index improver and functional viscosity index improver. For example, polymethacrylate (PMA), ethylene-propylene copolymer (OCP) and hydrogenated styrene-butadiene copolymer (HSD), etc. In which the ethylene propylene copolymer viscosity index improver is the most widely used.In this paper, the research work is mainly based on previous work. Choosing a appropriate degradation system, and controlled degradation of ethylene propylene copolymer to achieve a better performance. And after degradation of viscosity index improver, the products were functional response to make it more efficient, and satisfy the needs of high-performance lubricants. Specific research works as follows:(1) In the experiment, the degradation of ethylene propylene copolymer was catalyzed by a series of peroxide and air (oxygen). The results show that the base oil model 150SN; ethylene propylene copolymer model J0010, and its mass fraction in reaction system 16%-17%; the initiator is Y1, and its mass fraction is 0.015% (according to the weight of ethylene-propylene copolymer); reaction time is 5h; the SSI of viscosity index improver is 19 and the thickening capacity is more than 7.2. The product is suitable for deployment of high-grade lubricating oil. (2) In the experiment, the degradation of EPDM copolymer was catalyzed by a series of peroxide and air (oxygen). On this basis, the degradation of EPDM copolymers and ethylene-propylene copolymer mixed system was studied. For the degradation of EPDM copolymer, its mass fraction in reaction system 18%-19%; the initiator is Y1, and its mass fraction is 0.01%; the time of degradation reaction is 8h; the SSI of viscosity index improver is 20 and the thickening capacity is more than 7. For the degradation of compounding system, compounding ratio: EPDM copolymer is 30% and ethylene propylene copolymer is 70%; the initiator is Y1, and its mass fraction is 0.015%; the polymer mass fraction in reaction system is 17%-18%; the time of degradation reaction is 6h; the SSI of viscosity index improver is 20 and the thickening capacity is more than 7.(3) The preparation of dispersant ethylene propylene copolymer viscosity index improver was studied. The suitable processing conditions were obtained as follows:the initiator is F1, and its mass fraction is 0.5 %; the maleic anhydride mass fraction is 12%; the grafting reaction temperature is 160℃; the amine compounds mass fraction is 7%; the amination temperature is 140℃; the spot dispersion of product is 69; the SSI of viscosity index improver is 19; the thickening capacity is 5.8; the product color is 2.5; The product is suitable for deployment of high-grade lubricating oil.