水溶性稠化剂的流变性及成膜性能试验研究
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摘要
水溶性稠化剂的成膜能力是衡量其润滑性能的一个重要指标,为研究水溶性稠化剂的成膜性能,选用水溶性稠化剂聚氧乙烯(PEO)作为试验材料,利用流变仪在不同温度对不同质量分数的PEO水溶液进行流变性试验,再利用自制的点接触弹流润滑实验台对不同质量分数的PEO水溶液成膜性能进行研究。结果表明:PEO水溶液呈现剪切变稀的非牛顿流体特性,随着PEO质量分数的增加,PEO水溶液的非牛顿性增强;PEO水溶液在卷吸速度较高时的润滑行为符合弹流润滑规律,而在较低卷吸速度时的润滑行为符合薄膜润滑规律;不同质量分数的PEO水溶液其薄膜润滑转变为弹流润滑的临界速度不同,PEO质量分数越高,其临界速度越高;对于相同质量分数的PEO水溶液,载荷越大,其膜厚越小;在同一载荷下,水溶液中PEO质量分数越大,润滑膜中心膜厚越大。
The film forming ability of the water-soluble thickener is an important indicator to measure its lubricating performance.To study the film forming properties of the water-soluble thickener,water-soluble thickener polyoxyethylene(PEO) was selected as the test material.Rheometer was used to conduct rheological tests on different content of PEO aqueous solution at different temperatures.The self-made point contact elastohydrodynamic lubrication test bench was used to study the film forming ability of different content of PEO aqueous solution.The results show that the PEO aqueous solution exhibits shear thinning property of non-Newtonian fluid.With the increase of PEO content,the non-Newtonian effect of PEO aqueous solution is increased.The lubrication behavior of the PEO aqueous solution at higher entrainment velocity conforms to the elastohydrodynamic lubrication(EHL) theory,while that at lower entrainment velocity conforms to the thin film lubrication(TFL) theory.There is different critical speed of transition from TFL to EHL for the different content of PEO aqueous solution,the higher the PEO content in the aqueous solution,the higher the critical speed.For the same content of PEO aqueous solution,the greater the load,the smaller the film thickness.Under the same load,the higher the PEO content in the aqueous solution,the greater the film thickness at the center of the lubricating film.
The film forming ability of the water-soluble thickener is an important indicator to measure its lubricating performance.To study the film forming properties of the water-soluble thickener,water-soluble thickener polyoxyethylene(PEO) was selected as the test material.Rheometer was used to conduct rheological tests on different content of PEO aqueous solution at different temperatures.The self-made point contact elastohydrodynamic lubrication test bench was used to study the film forming ability of different content of PEO aqueous solution.The results show that the PEO aqueous solution exhibits shear thinning property of non-Newtonian fluid.With the increase of PEO content,the non-Newtonian effect of PEO aqueous solution is increased.The lubrication behavior of the PEO aqueous solution at higher entrainment velocity conforms to the elastohydrodynamic lubrication(EHL) theory,while that at lower entrainment velocity conforms to the thin film lubrication(TFL) theory.There is different critical speed of transition from TFL to EHL for the different content of PEO aqueous solution,the higher the PEO content in the aqueous solution,the higher the critical speed.For the same content of PEO aqueous solution,the greater the load,the smaller the film thickness.Under the same load,the higher the PEO content in the aqueous solution,the greater the film thickness at the center of the lubricating film.
引文
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[2]王祖安.新型水溶性稠化剂[J].润滑油,1993,8(5):39-41.WANG Z A.New type water soluble thickener[J].Lubricating Oil,1993,8(5):39-41.
[3]郑哲,方建华,王建华,等.新型水溶性润滑添加剂的研究进展[J].摩擦学学报,2017,37(3):409-420.ZHENG Z,FANG J H,WANG J H,et al.The research progress of novel water-soluble lubricant additives[J].Tribology,2017,37(3):409-420.
[4]李刚.苛刻条件下润滑脂成膜机理及润滑特性研究[D].北京:清华大学,2010.
[5]解国新,雒建斌,郭丹,等.普通离子液体润滑剂的润滑成膜性能研究[J].机械工程学报,2011,47(11):82-86.XIE G X,LUO J B,GUO D,et al.Film forming characteristics of common ionic liquid lubricants[J].Journal of Mechanical Engineering,2011,47(11):82-86.
[6]聂淑芳,刘辉,刘艳丽,等.几种亲水凝胶骨架材料相关性质的比较[J].药学学报,2011,46(3):338-343.NIE S F,LIU H,LIU Y L,et al.Comparison of the characteristics of several polymer materials used in hydrophilic matrix tablets[J].Acta Pharmaceutica Sinica,2011,46(3):338-343.
[7]杨倩倩.分离流量法的非牛顿流体润滑理论、计算与实验研究[D].广州:华南理工大学,2016.
[8]HAMROCKB J,DOWSON D.Isothermal elastohydrodynamic lubrication of point contacts:Part III.fully flooded results[J].Transasmef,1983,28(2):159-171.
[9]LUO J,WEN S,HUANG P.Thin film lubrication.Part I.Study on the transition between EHL and thin film lubrication using a relative optical interference intensity technique[J].Wear,1996,194(1/2):107-115.
[10]LUO J B,QIAN L M,WEN S,et al.The failure of fluid film at nano-scale[J].ASLE Transactions,1999,42(4):912-916.
[11]ZHU D.Elastohydrodynamic lubrication in extended parameter ranges.Part I:speed effect[J].ASLE Transactions,2002,45(4):540-548.
[12]GLOVNEA R P,OLVER A V,SPIKES H A.Experimental investigation of the effect of speed and load on film thickness in elastohydrodynamic contact[J].ASLE Transactions,2005,48(3):328-335.