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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Effect of thermo-mechanical processing on the rheology of oleogels potentially applicable as biodegradable lubricating greases
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Effect of thermo-mechanical processing on the rheology of oleogels potentially applicable as biodegradable lubricating greases

机译：形变场处理的效果流变学oleogels可能适用可生物降解的润滑油脂

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This work is focused on the development of oleogels potentially suitable as biodegradable lubricating greases by studying the effect that some thermo-mechanical processing variables exert on their rheological properties and microstructure.Oleogels were prepared by dispersing sorbitan monostearate(SMS)in castor oil under different agitation conditions and thermal protocols.The effect of processing variables was evaluated by performing small-amplitude oscillatory shear(SAOS)measurements,AFM observations and some mechanical and tribological tests usually employed to check lubrication performance and stability of lubricating greases.Rheological properties of oleogels can be monitored in situ during processing using a rheo-reactor.Processing conditions such as maximum temperature applied to disperse the gelling agent,heating time,agitation speed and cooling rate significantly influence gel strength.Cooling profile is the most important processing variable affecting the rheological response of oleogels.Differences of more than one decade in the values of SAOS functions were found for oleogels processed by applying different cooling profiles.A moderate agitation during SMS dispersion in oil yields maximum values of oleogel linear viscoelasticity functions.The maximum processing temperature reached during this stage should be only slightly higher than the SMS melting point.In general,oleogel samples exhibited a poor mechanical stability after sample working in a rolling element,but,on the contrary,they recovered completely their initial consistency after a moderate resting time,also exhibiting remarkable lubricant properties.Moreover,oleogel samples tested in a ball-disc tribometer show values of the friction coefficient inferior to those obtained with model lithium lubricating greases.
机译：这项工作是关注的发展oleogels潜在合适的可生物降解的润滑油脂的研究的影响一些变量产生形变场处理在他们的流变特性微观结构。在castor分散山梨醇酐单硬脂酸酯(SMS)石油不同搅拌条件下,热的协议。变量被进行评估小振幅振荡剪切(sao)测量,AFM观察和一些力学和摩擦学测试通常用来检查和润滑性能润滑油脂的稳定性。oleogels可以原位监测的性质在处理过程中使用rheo-reactor。最高温度等条件分散胶凝剂,加热时间,搅拌速度和冷却速率显著影响凝胶强度。重要处理变量的影响oleogels流变响应。不止一个十年圣的值oleogels处理功能被发现应用不同的冷却配置文件。风潮在SMS分散石油产量最大值的oleogel线性粘弹性功能。在这个阶段应该略高于SMS熔点。将军,oleogel样品表现出一个贫穷机械稳定性样品工作之后滚动的元素,但是,相反,它们完全恢复最初的一致性适度的休息时间后,也表现出卓越的润滑性能。样品测试在ball-disc摩擦计的摩擦系数差值同锂润滑模型油脂。

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