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首页> 外文期刊>Environmental Science & Technology >Viscosity Modification Of High-oleic Sunflower Oil With Polymeric Additives For The Design Of New Biolubricant Formulations
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Viscosity Modification Of High-oleic Sunflower Oil With Polymeric Additives For The Design Of New Biolubricant Formulations

机译：设计新型生物润滑剂配方的高分子添加剂对高油葵花籽油的粘度改性

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Although most common lubricants contain mineral or synthetic oils as basestocks, new environmental regulations are demanding environmentally friendly lubricants. In this sense, vegetable oils represent promising alternatives to mineral-based lubricants because of their high biodegradability, good lubricity, and low volatility. However, their poor thermo-oxidative stability and the small range of viscosity represent a clear disadvantage to be used as suitable biolubricants. The main objective of this work was to develop new environmentally friendly lubricant formulations with improved kinematic viscosity values and viscosity thermal susceptibility. With this aim, a high-oleic sunflower oil (HOSO) was blended with polymeric additives, such as ethylene vinyl acetate (EVA) and styrene-butadiene-styrene (SBS) copolymers, at different concentrations (0.5-5% w/w). Dynamic viscosity and density measurements were performed in a rotational rheometerand capillary densimeter, respectively, in a temperature range between 25 and 120 ℃. An Arrhenius-like equation fits the evolution of viscosity with temperature fairly well. Both EVA and SBS copolymers may be satisfactorily used as additives to increase the viscosity of HOSO, thus improving the low viscosity values of this oil. HOSO viscosity increases with polymer concentration. Specifically, EVA/ HOSO blends exhibit higher viscosity values, which are needed for applications such as lubrication of bearings and four-stroke engines. On the other hand, viscosity thermal susceptibility of HOSO samples increases with EVA or SBS concentration.
机译：尽管大多数普通润滑剂都包含矿物油或合成油作为基础油，但新的环保法规要求使用环保型润滑剂。从这个意义上讲，植物油由于具有高生物降解性，良好的润滑性和低挥发性，因此可以替代矿物基润滑剂。然而，它们的热氧化稳定性差和粘度范围小代表明显的缺点，不能用作合适的生物润滑剂。这项工作的主要目的是开发具有改善的运动粘度值和粘度热敏感性的新型环保润滑剂配方。为此，将高油酸葵花籽油（HOSO）与聚合物添加剂（例如乙烯乙酸乙烯酯（EVA）和苯乙烯-丁二烯-苯乙烯（SBS）共聚物）以不同的浓度（0.5-5％w / w）混合。动态粘度和密度测量分别在旋转流变仪和毛细管密度计中，在25至120℃的温度范围内进行。类似于Arrhenius的方程式非常适合粘度随温度的变化。 EVA和SBS共聚物均可令人满意地用作添加剂，以提高HOSO的粘度，从而改善该油的低粘度值。 HOSO粘度随聚合物浓度而增加。具体地说，EVA / HOSO混合物显示出较高的粘度值，这是轴承和四冲程发动机润滑等应用所需要的。另一方面，HOSO样品的粘度热敏感性随EVA或SBS浓度的增加而增加。

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