Lithium/Lithium Complex: The majority of greases sold worldwide are made with a simple lithium soap or lithium complex thickener. In order for a grease to change state, one thing that has to happen is the soap matrix needs to break down, to degrade. Table 1 is a lithium grease in mineral group I base oil. Simple soaps are most commonly based on salts of lithium and calcium, and less commonly on salts of sodium, aluminum, and barium. Lithium hydroxideis used in the production of lithium soaps, which are used in making lubricating greasesfrom oil. Additives are required to improve performance or to meet current standards and specifications. A grease composition having improved thickener yield, comprised of a major amount of a lubricating base oil, and a minor amount of a lithium complex thickener. Unirex EP 2 is a premium quality grease that combines advanced lithium complex soap technology and leading edge polymer enrichment technology to provide excellent adhesion, water wash-out resistance, mechanical stability and high temperature performance. Have some questions about formulation and blending process. The main components of lithium soaps are lithium stearate and lithium 12-hydroxystearate.[4]. OEM meets requirements of Hino , Isuzu , Honda , Mitsubishi . Bicycle bearing greases explained | BikeGremlin The manufacturing process and formulating of grease is pure chemistry. Classification and Characteristics of Grease - Kyodo Yushi (25) attributed the fiber shortening of lithium soap-based grease to the loss of physical bonding of thickener molecules at high temperature (120). Both lithium soap-based grease and lithium complex grease exhibit good shear resistance. Don't missour next Lubeletter where the variousnon-soap thickenersused to formulate Nye's greases will be featured. The base oil viscosity can be different between #1 and #2 in the same brand and type of grease; but the base oil might stay the same vis and the #2 grade have more percent lithium soap (thickener) in the mix. At the end of the day, the most important thing is to select the right grease for the application. EP Grease - Selso Lubricants Grease is one of the oldest lubricants used by humans dating back to 1400BC.[3]. materials? If you provide more services, kindly contact me via the mentioned e-mail. If youre responsible for lubricating machinery in a plant or factory, choosing the right grease is important. WHAT IS MULTI-PURPOSE GREASE USED FOR - Epoxy Oil Lithium greases are expensive due to the high price of raw materials. -Any required ratio of LiOH:12 HSA:HCO to get maximum yield. The dropping point of 190-200C (374-392F) is lower for many high-temperature applications. High-quality base oil ensures a good oil film thickness is maintained, even in high-temperature applications, protecting components from wear. "Numerous types of grease thickeners are currently in use, each with its own pros and cons. Over time, if the oil separates too much in storage, it may be impossible for the grease to be reconstituted for use. In the actual reaction process, 12-hydroxystearic acid and stearic acid as thickeners cannot completely saponify with lithium hydroxide to form soap fibers. Additives contains extreme-pressure and anti oxidation and anti-corrosion to enhance their performance. Not all greases are created equal some will withstand high temperatures, while others are better at resisting water and other contaminants. They offer excellent lubricity, shear stability, and thermal resistance. When they were first developed, calcium soap based greases were used to provide basic lubrication for a range of simple applications. lithium 12-hydroxystearate grease is probably the best multipurpose grease ever developed. Lithium grease adheres particularly well to metal, is non-corrosive, may be used under heavy loads, and exhibits good temperature tolerance. Following the 15 minutes mixing time, apply full heat to initiate the temperature ramp to the 195-200C (383-392F). The chart below summarizes the key characteristics of each thickener we have discussed. The penetration range at 77F (25C) is 265 to 295. Thickener plays a significant role on the performance of grease, including rheological property, chemical and thermal stability, colloidal and mechanical stability, and so forth. The invention provides a process for the preparation of a lithium soap thickened grease which comprises heating a mixture of an oil and a lithium base, and optionally also a calcium base, to at. Automotive GreaseProduct InformationNIPPECO Grease Selection: Lithium vs. Lithium Complex - Machinery Lubrication Lithium greases provide good lubricity and have great shear stability, thermal resistance and relatively low oil separation. Global Presence. [3] Its unique thickener technology and low viscosity oil (PAO) provide excellent lubrication performances at low temperatures. Lithium Complex. As a result, it is resistant to both the absorption of water and washing by water. Career. Shell Gadus S2 V220 2 greases are designed . Lithium Multipurpose Greases - Grainger Industrial Supply Back in November 2017, the spot price for battery-grade lithium carbonate in China peaked at 175,000 yuan per tonne. Here are a few of the suitable uses: There are many factors to consider when choosing lithium soap-based grease. 4).And the thickener microstructure strongly determines the physicochemical properties of LCG ().From the FE-SEM, The LCGs prepared by azelaic acid and sebacic acid show the entangled spiral fiber . A Not recommended for use in sliding and reciprocating applications due to less adhesion. [6] Grease, as we know it today, is a three dimensional network of thickener particles. Best Grease For Bench Vise - Tools Guidance Lithium soaps are very efficient thickeners. Anticorrosion additives are specifically needed. These thickener types have an advantage over simple soap because of better high-temperature properties. Lithium soap greases resist shearing . At this time, modern lithium soap (thickener) consists of 12HSA (12-hydroxystearic acid, or triglycerides) with lithium hydroxide monohydrate in a base fluid. Its mechanical effect as a lubricant between the two moving objects is in the field of physics. Soap thickened greases consist of simple, mixed and complex soaps. Thickener Base Oil Kinematic Viscosity of Base Oil 40 Weld Load by Shell Four-Ball Test 1760rpm,10sec Approximate Operating Temperature Range Description NET, Packing Unit, Code; Sumigrease BG: No.3 240 Light Brown: Lithium Soap: Mineral Oil : 99mm 2 /s: 1,236N: 20+130 A lithium soap grease with excellent water resistance and . Complex soaps. Lithium complex grease, the most popular in North America, is made with lithium hydroxide, 12 HSA, and azelaic acid. The composition of the thickener is the mixture of lithium 12-hydroxyoctadecanoate and lithium stearate, and the molecular structure of lithium soap is shown in Fig. Lithium grease is probably the best multi-purpose grease ever developed. MOLYKOTE 55 O-Ring Grease is the industry standard for lubricating metal-on-elastomer interfaces and sealing rubber O-rings & connectors. [Pg.905] Lithium greasescan be manufactured by continuous processin a heated tube reactor. Grease, Mineral Oil and Lithium Soap Thickener. PDF Fundamental study of the initial agglomeration of lithium soap - NLGI Calcium greases have a higher water resistance than lithium grease. Thickener Type. A variety of industrial equipment including agricultural, mining, construction machinery, pumps, conveyors, elevators, chains, pulleys, cranes, shafts, wire ropes, and automotive applications require good thermal stability and water resistance. Base Oil Viscosity of Greases @ 40 C, mm2/s, AMS . Lithium salts are generally preferred to soaps with other counterions such as sodium, calcium, and barium. Calcium soap greases do not have good thermal resistance (dropping points range from 135-145C) and are typicallyonly used in applications that operate up to 110C. But, what is the best option for your application? A grease thickener can influence your greases operating temperature, load, speed, and material compatibility. Furthermore, small amounts of polymer additives can be added to lithium complex and lithium soap-based greases to improve their water resistance. Lubricating grease is a thickened oil (gelled). It reduces friction as well as resists water and provides sealing. Other thickeners such as calcium and barium are more water resistant than lithium and lithium complex thickeners, but their negative qualities make them less desirable in a wide variety of applications. View Details. grease based on a Lithium-12-Hydroxy stearate soap for long time lubrication under high load. The environmental impact of grease manufacturing plants and the use of grease is the domain of health and environmental sciences. The dropping point of 190-200C (374-392F) is not high enough for several high-temperature applications. Calcium, lithium, aluminum, barium, polyuria, even clay - you'll see greases made with these kind of thickeners. Thickening by silica, and add other additive. MOLYKOTE PAO Greases, DuPont - ChemPoint also how can I attain transparent and crystal appearance in grease please tell. Material Description. Product Name Base Oil Thickener Penetration Grade Characteristics; PERMALUB FIM-3J: Synthetic oil: Lithium soap: 2 . Well use them to improve our service. Non-soaps are split into two main categories. April 1, 2017. It is a highly versatile, multipurpose grease invented in the 1940s. Including but not limited to physics, chemistry, tribology, rheology, formulation, manufacturing, mechanical engineering, chemical engineering, and health and environmental sciences. additives is less than 25 wt % of the grease composition. Lithium soap-based grease: In almost all industrial sectors, it is the most preferred bearing grease. The first group is comprised of thickeners that undergo a chemical reaction to form the thickener, such as calcium sulfonates and polyureas.The second group is a dispersion of particles in oil that includes silica, organo-clays, polytetrafluoroethylene (PTFEs), and carbon black. Lithium 12-hydroxy stearate greases are the most widely used soap greases. Quick Links. And why use both in grease blending as raw Thickener transforms liquid lubricant (base oil) into a semi-solid grease. Lithium hydroxide, Calcium hydroxide or Aluminium hydroxide which is why you will hear greases described as lithium grease, calcium grease and so on. [2]. Mixing greases in a system can cause issues with thickener systems reacting with each other. Addressing Grease Shortages Starts with Soap Thickeners - Polyurea Explained: Why Lithium Prices Have Surged 400 Per Cent Despite The US5236607A - Preparation of lithium soap thickened greases - Google CA2059234C - Preparation of lithium soap thickened greases - Google Patents The LMCG 1 from SKF is a polyethylene thickened mineral oil-based grease with lithium complex thickening technology. [5] Some formulations include PTFE or other substances, such as molybdenum disulfide. Choosing the Right Grease Thickening System: Soap Thickeners -How is intermediate and final temperature & ramp time during grease blending affect yield and grease properties? The different types of soap thickeners include lithium 12-hydroxy stearate soaps, lithium stearate soaps, calcium soaps, sodium soaps and aluminum soaps. Grease chemistry is governed by thickener structure Itis a fatty acid salt and used to stabilize and thicken lubricating greases. The first major characteristic is mechanical stability, or shear stability, which is the ability of the grease to remain consistent under mechanical shear forces. Difference in NLGI Grade 1 and Grade 2 lithium grease? - Gunloads.com The oxidative resistance of lithium greases is generally improved with anti-oxidants. The metal used defines the type of soap, with lithium being the most common. Sodium soaps do provide good shear stability and lubricity. Lithium soap is the thickener that turns the base oil into grease. So, it is best to compare lithium soap-based grease to those using other thickeners, such as sodium and calcium soap thickeners. MOLYKOTE 55 O-Ring Grease is formulated from a high-quality silicone base oil with added synthetic ester and a lithium soap thickener. Lithium greases are traditionally used in automotive and industrial applications such as bearings. It has a dropping point of 190 to 220C (370 to 430F) and resists moisture, so it is commonly used as lubricant in household products, such as electric garage doors, as well as in automotive applications, such as constant-velocity joints. Introduction. Greases with com-plex soap thickeners are becoming more popular because of higher operating temperature and superi-or load-carrying abilities. PDF GREASE COMPATIBILITY CHART - PetroLiance -How does cooling rate affect grease properties? Cool to below 80C (176F), add additives, add more base oil to achieve desired NLGI grade and mill.
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