润滑脂新型添加剂研究进展

润滑脂由于其特殊的应用性能,是不可或缺的润滑材料。润滑脂添加剂正由传统的单一性能添加剂向复合型添加剂方向发展。综述了润滑脂中离子液体添加剂、固体材料添加剂和环保型添加剂的研究现状,指出了当前研究中存在的问题,并对今后润滑脂添加剂的发展提出了建议。     

汽车锂基脂行车试验

锂基润滑脂是多效、通用、长寿命润滑脂,也是汽车轮毂轴承润滑的理想润滑脂。目前世界汽车主要生产国多采用锂基润滑脂。我国目前多采用钙基润滑脂或钙钠基润滑脂,其性能差,不耐高温,使用寿命短。解放牌汽车轮毂采用钙基润滑脂.其寿命6000～10000km.     

碳酸钙在润滑脂中的应用

碳酸钙是一种重要的无机物，具有来源广泛、物美价廉的优点。润滑脂在工业发展中发挥着重要的作用，是机械设备正常运行的重要保障。碳酸钙作为钙类润滑脂的基础原料，可以制备出多种性能良好的润滑脂；作为润滑添加剂，碳酸钙纳米粒子具有良好的摩擦学性能，将其添加到润滑脂中，可以有效提高润滑脂的抗磨减摩性能；碳酸钙具有绿色价廉、填充性能优异的优点，将其作为润滑脂增容增重的填充剂，可以减少润滑脂原料的使用，有利于环境的保护。     

MAF-6作为无水钙基润滑脂添加剂的摩擦学性能研究

以金属多氮唑骨架材料(MAF-6)作为润滑脂固体添加剂,考察其在润滑脂中的摩擦学性能。结果表明,MAF-6作为添加剂能有效提高基础脂的摩擦学性能,在高往复频率、高运行载荷和延长运行时间的条件下,MAF-6脂能够保持优异的减摩抗磨性能。研究其润滑机制发现,在运行过程中,拥有柔性晶体结构的球状MAF-6能够粘附在金属表面,表现出优良的润滑性能。     

道康宁推出超高性能特种润滑脂

由于具有优异性能以及能够解决或预防任何设备实际润滑问题的专业技术，近60年来，世界各地的OEM设计人员，维护与材料工程师始终信赖MOLYKOTE品牌。日前，道康宁公司推出了专为严酷作业环境设计的MOLYKOTE超高性能特种润滑脂。MOLYKOTE HP-300和HP-500超高性能特种润滑脂设计用来润滑在严酷环境中作业的轴承、     

重载车辆润滑脂流变及润滑特性对比分析

考察了四种重载车辆润滑脂的流变学性能和摩擦学性能,分析了基础油的种类和粘度、稠化剂的种类和含量以及增粘剂等参数在不同温度下对润滑脂流变学性能的影响;使用流变仪的"三板球"测试组件对四种润滑脂摩擦学性能进行测试,考察不同压力和速度下润滑脂摩擦系数的变化情况。结果表明:在流变学测试中,LX-4和LX-2润滑脂表现出了较好的高温性能,说明这两种润滑脂在高温密封性能和高温粘附性上表现优异,其中LX-4在高低温范围都显示出优良的润滑性能。在摩擦学测试中,LX-2润滑脂表现出较低的摩擦系数,特别是在50 N高压区,LX-2表现出更容易进入薄膜润滑区,润滑膜形成更加容易,摩擦系数下降较快。     

固体无机润滑材料—二硫化钨

一、前言随着科学技术事业的发展,涉及多学科知识和行业的润滑技术的作用显得更为重要。润滑材料也由过去习惯使用的各种润滑油、润滑脂发展到固体润滑材料,而且气体润滑也引起了人们的重视。应用得最早而又广泛的固体润滑材料是石墨和被称为“润滑之王”的二硫化钼。它们在解决某些高温、低温、高负荷、真空等苛     

二硫化钨润滑添加剂摩擦学性能研究现状

二硫化钨是一种新型的固体润滑添加剂,二硫化钨在润滑脂和润滑油中均表现出了良好的抗磨减摩性能。本文概述了二硫化钨在润滑脂和润滑油中的摩擦学性能研究现状。     

超声波改善二硫化钼润滑脂性能的研究

研究了超声波对二硫化钼润滑脂性能的影响,结果表明,超声波能通过声流和声空化作用对复合锂基润滑脂中的二硫化钼进行微观均化,进而提离润滑脂的抗磨减摩性能。     

高抗水淋连铸机润滑脂的研制

结合连铸机高温、高负荷、有水淋的苛刻工况,通过对润滑脂基础油、稠化剂以及其他添加剂的考察和筛选,确定了一种高抗水淋连铸机润滑脂的配方。经润滑脂理化性质的试验研究以及在国内某钢铁厂连铸机润滑系统的应用,表明高抗水淋连铸机润滑脂不仅具有良好的抗水、防锈、抗腐蚀性能,且具有良好的极压性、剪切安定性、机械安定性及高温性能,可满足连铸机的使用要求。     

Utilization of olive-residue oil in the formulation of lubricating calcium greases

Calcium greases were manufactured from olive-residue oil in a closed reactor by substituting olive-residue oil for animal tallow. The results of the performance tests applied to the obtained greases showed that their physicochemical and mechanical characteristics are comparable to those of calcium grease manufactured industrially by using animal tallow. The substitution of part of the animal tallow with olive-residue oil increased the thermal and mechanical stability of the grease. Olive-residue oil could constitute, alone or in combination with animal tallow, a raw material in the formulation of lubricating calcium grease.     

锂基润滑脂热流变特性及其变化机理

采用旋转流变仪探究了变温条件下的锂基润滑脂流动特性和黏弹特性,考察了温度对锂基润滑脂流变特性变化的影响规律,并对热流变过程中壁面滑移效应变化规律进行了讨论。进一步结合锂基润滑脂的微观形貌,探究了锂基润滑脂皂纤维结构与热流变特性变化的关联性。最后基于热流变和皂纤维结构研究结果,分析了锂基润滑脂胶体分散体系结构演化过程,给出了胶体分散体系及壁面滑移效应在热流变条件下的变化机理。     

多功能通用润滑脂的研制

介绍了多功能通用润滑脂的研究过程及性能。实验室理化性能测定和实际使用结果表明，该脂主要性能达到了美军标ML-G-10924F的质量标准，可以满足火炮、炮弹及车辆等军械装备的使用要求。     

Influence of soap/polymer concentration ratio on the rheological properties of lithium lubricating greases modified with virgin LDPE

The main goal of this work was to study the feasibility of using a low-density polyethylene (LDPE) as additive to improve the rheological properties of lithium lubricating greases. The combined effect that both soap and LDPE concentrations exerts on the rheology of lithium lubricating greases and its relationship with grease microstructure were studied according to an experimental design based on the response surface methodology (RSM). Different lubricating grease formulations were manufactured by modifying lithium 12-hydroxystereate and LDPE concentrations. Small-amplitude oscillatory shear (SAOS) and viscous flow measurements, as well as mechanical stability tests, were performed. In addition to these, environmental scanning electronic microscopy (ESEM) was used to determine grease microstructure. LDPE was found to be a useful additive to modify grease rheology, acting as filler in the entangled soap network. The values of both apparent viscosity and linear viscoelasticity functions increase with soap and LDPE concentration. However, the addition of LDPE distorts soap microstructural network, yielding greases with lower relative elastic characteristics.     

Rheology of lubricating greases modified with reactive NCO‐terminated polymeric additives

A comprehensive rheological characterization of lithium lubricating greases modified with NCO‐terminated polymers has been performed in this work, with special emphasis on the effect of temperature. With this aim, NCO‐terminated polymers were prepared from several di‐ and tri‐functional polyols and polymeric MDI. Afterwards, the reaction between terminal isocyanate groups and 12‐hydroxystearate lithium soap, used as thickener for lubricating grease formulations, was promoted. Transient and steady‐state viscous flow, rheo‐destruction and stress relaxation tests were performed on the different samples studied. In this sense, the influence that temperature, free NCO content, molecular weight, and functionality of the reactive polymers exert on the rheological response of lubricating greases was analyzed. The most important rheological modification was achieved by using the lowest molecular weight polymer. In general, NCO‐terminated polymers significantly dampen the influence of temperature on the rheological functions of the additive‐free lubricating grease. In some cases, the viscosity and/or viscoelastic functions even increase with temperature, especially in formulations with residual free NCO groups. Several experimental flow problems, such as fracture and sample expelling from the measuring tool, are generally found, more frequently in formulations with high NCO content. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Recycled and virgin LDPE as rheology modifiers of lithium lubricating greases: A comparative study

In this work, a new application for recycled low‐density polyethylene (LDPE), as rheology modifier of standard lithium lubricating grease formulations, was studied. The effectiveness of this additive was compared with that achieved with a virgin LDPE. With this aim, both types of polymers were added to the formulation during the manufacturing process of greases, following the same standard protocol, to reinforce the role of the thickening agent, the lithium 12‐hidroxystearate. The effect that both lithium soap and LDPE concentrations exert on the rheology of lubricating grease formulations and its relationship with grease microstructure were discussed. Lubricating greases were rheologically characterized through small‐amplitude oscillatory shear and viscous flow measurements. In addition to these, scanning electron microscopy observations and mechanical stability tests were also carried out. In all cases, an increase in soap concentration yields higher values of apparent viscosity and linear viscoelasticity functions. On the other hand, the values of the rheological functions obtained for recycled LDPE‐based lubricating greases are, in general, higher than those obtained for virgin LDPE‐based grease formulations. However, the structural skeleton developed in greases containing recycled LDPE demonstrates less resistance to severe working conditions, showing lower mechanical stability than virgin LDPE‐based grease formulations. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers     

The effect of recycled polymer addition on the thermorheological behavior of modified lubricating greases

This article deals with the influence of temperature on the rheological behavior of lithium lubricating greases modified with three different types of recycled polymers, high‐density polyethylene (HDPE), low‐density polyethylene, and polypropylene (PP), all deriving from waste plastic recycling plants. Grease formulations containing diverse polymers were manufactured and rheologically characterized. Small‐amplitude oscillatory shear and viscous flow measurements over a temperature range of 25–175°C were carried out. The experimental results obtained suggest that a blend of HDPE and PP could be considered a suitable potential viscosity modifier for lithium lubricating greases in a wide range of in‐service temperature. Thus, the lubricating greases studied modified by HDPE or PP show quite promising results at low or high temperature, respectively. In addition, thermomechanical reversibility has been studied by applying different combined stress–temperature protocols. Lubricating greases containing any of the recycled polymers studied show a significant irreversible structural breakdown when the sample is submitted to temperatures and stresses higher than 75°C and 200 Pa, respectively. Regarding lubricating grease viscous flow behavior, a minimum in the shear stress versus shear rate plots appeared at temperatures above 50°C, more pronounced as temperature increased, resulting from material flow instabilities. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers.     

固体涂层与油脂复合润滑现状及发展趋势

随着机械设备零件的减磨耐磨技术发展,固体润滑涂层与油脂润滑在机械设备上得到了广泛的应用,固体-油脂复合润滑方式也取得了很大的进展。本文论述了在边界润滑条件下,固体-油脂复合润滑的研究现状及应用价值,指出了固体——油脂复合润滑的发展趋势及存在的主要问题。     

润滑脂流变性影响因素研究现状

润滑脂由于其复杂而独特的流变性能,近年来受到了学界的广泛关注。学者们选用一系列流变参数来定性定量描述润滑脂的流变性能。润滑脂组分、工作条件及制备手段的变化常常会影响和改变润滑脂的流变参数。综述了温度,稠化剂结构、含量及粒度,基础油,添加剂及填料,制备条件,微观结构等因素对润滑脂流变参数的影响情况,总结了润滑脂流变学发展中存在的问题,并对润滑脂流变学未来的发展进行了展望。