雌酚的冷流特性:老方法(D97 和 D2500)与小方法(D5773 和 D5949)的比较

IF 3.1 3区 工程技术 Q2 ENGINEERING, MECHANICAL Lubricants Pub Date : 2024-04-23 DOI:10.3390/lubricants12050141
Grigor B. Bantchev, Helen Ngo, Yunzhi Chen, DeMichael D. Winfield, S. Cermak
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引用次数: 0

摘要

有关开发新型可持续润滑油的研究日益增多。在许多应用中,具有适当冷流特性的可持续润滑油尤其受到关注。测量冷流特性的既定方法的一个局限性是测试样品所需的体积较大。这使得许多难以合成的样品难以进行初步筛选。在当前的研究中,我们比较了较早的、广为接受的 ASTM 方法 D97(倾点,PP)和 D2500(浊点,CP)与较新的、体积较小且易于操作的生物基基础油(雌烷醇和异雌烷醇)方法 D5949 和 D5773 的结果。对于颜色较浅的样品,CP 结果非常一致,但对于一些颜色较深(加德纳色 >8)的样品,尤其是酯类,D5773 得出的数值较低。D5949 报告的 PP 值略微偏高,尤其是较低值。此外,还测量了较大温度范围(15 至 120 °C)内的粘度和密度。表面张力是通过文献组方法估算的。粘度和密度效应只能部分解释两种方法得出的 PP 值的差异。总之,除非样品颜色太深,否则在无法获得较大体积样品的情况下,较新的微型方法是一种可以接受的替代方法。
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Cold-Flow Properties of Estolides: The Older (D97 and D2500) versus the Mini-(D5773 and D5949) Methods
There is growing research on developing new and sustainable lubricants. Sustainable lubricants with adequate cold-flow properties are of particular interest for many applications. One limitation of the established methods for measuring cold flow properties is the large volume needed to test samples. This makes initial screening of many hard-to-synthesize samples difficult. In the current study, we compared the results of the older, widely accepted ASTM methods D97 (pour point, PP) and D2500 (cloud point, CP) to the newer, smaller-volume, and easier-to-perform methods D5949 and D5773 for bio-based base oils (estolides and iso-estolides). The CP results were in good agreement for less colored samples, but D5773 gave lower values for some darker (Gardner color >8) samples, especially esters. The D5949 showed a tendency to report slightly higher PP, especially for the lower values. Viscosities and densities in a wide temperature range (15 to 120 °C) were also measured. The surface tensions were estimated by a literature group method. Viscosity and density effects can only partially explain the differences in the PP values from the two methods. In conclusion, the newer mini-methods are an acceptable substitution when larger volumes are not accessible, unless the sample is too dark.
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来源期刊
Lubricants
Lubricants Engineering-Mechanical Engineering
CiteScore
3.60
自引率
25.70%
发文量
293
审稿时长
11 weeks
期刊介绍: This journal is dedicated to the field of Tribology and closely related disciplines. This includes the fundamentals of the following topics: -Lubrication, comprising hydrostatics, hydrodynamics, elastohydrodynamics, mixed and boundary regimes of lubrication -Friction, comprising viscous shear, Newtonian and non-Newtonian traction, boundary friction -Wear, including adhesion, abrasion, tribo-corrosion, scuffing and scoring -Cavitation and erosion -Sub-surface stressing, fatigue spalling, pitting, micro-pitting -Contact Mechanics: elasticity, elasto-plasticity, adhesion, viscoelasticity, poroelasticity, coatings and solid lubricants, layered bonded and unbonded solids -Surface Science: topography, tribo-film formation, lubricant–surface combination, surface texturing, micro-hydrodynamics, micro-elastohydrodynamics -Rheology: Newtonian, non-Newtonian fluids, dilatants, pseudo-plastics, thixotropy, shear thinning -Physical chemistry of lubricants, boundary active species, adsorption, bonding
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