A Lithium greases are expensive due to the high price of raw materials. 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. Caltex Molytex EP 2 Lithium Grease is formulated with a highly refined ISO VG 220 mineral base oil in combination with a lithium soap thickener and robust extreme pressure additives. Lithium soaps are the most commonly used thickeners. Lithium grease has excellent water resistance (not as good as calcium), superior mechanical or shear stability, excellent thermal stability and, excellent storage stability. Types of Non-Soap Thickeners This can change the physical and chemical structure of the grease, causing an inability to hold or release the base oil. Comment * document.getElementById("comment").setAttribute( "id", "a5737489e58065245e5e0a21a61bc784" );document.getElementById("d1d327f8af").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. Furthermore, small amounts of polymer additives can be added to lithium complex and lithium soap-based greases to improve their water resistance. Thickener Type. The chart below summarizes the key characteristics of each thickener we have discussed. Different thickener systems can react with each other to modify the physical and chemical structure resulting in the inability to hold or release the base oil. grease based on a Lithium-12-Hydroxy stearate soap for long time lubrication under high load. Here, lithium complex-calcium sulfonate (L/C) greases were synthesized via regulating lithium complex soap and calcium sulfonate in the molar ratio of 1:2, 2:1 and 1:1, along with thickening the polyalphaolefin (PAO40 . They are used in applications that require excellent structural stability at low to moderate temperatures, good water resistance, good low temperature pumpability, and good low to medium operating temperatures. GREASE NLGI 3 is a relative rigid grease. Not recommended for use in sliding and reciprocating applications due to less adhesion. PAO based grease with lithium thickener and offering reduced stringiness and commonly used with glass fiber reinforced plastics (GFRP). Examples of simple soap thickeners include lithium 12-hydroxystearate and calcium stearate. Lithium grease adheres particularly well to metal, is non-corrosive, may be used under heavy loads, and exhibits good temperature tolerance. NIPPECO manufactures greases suitable for many automobile and machinery industries in Japan and internationally. About. Aluminum soaps have excellent oxidation resistance and good water resistance. 1347613 [LMCG1/0.4 from SKF Group (The)] from RS Components, Ltd. Cool to below 80C (176F), add additives, add more base oil to achieve desired NLGI grade and mill. 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 . Because lithium soaps are very efficient thickeners, lithium 12-hydroxystearate greases are the most prevalent. To analyze the complexing effect on the microstructure of the lithium complex soap, the FE-SEM and AFM was employed to investigate the microstructure of the lithium complex soap (Fig. So, in this blog post, well take a look at it and explain why it might be the best choice for your application. Simple soaps are most commonly based on salts of lithium and calcium, and less commonly on salts of sodium, aluminum, and barium. Invented in [], Calcium Soap Greases: Tallow (animal fat) based calcium greases were the earliest [], Lubricating grease consistency A grease consistency or penetration score indicates grease consistency []. Hello! In addition, since their formulation is not based on metal soap thickeners like lithium greases, which can leave behind wetter sediment when used up, they typically are the preferred choice of lubrication for electric motors. So that tells us that the kind of thickeners used to make the grease will dictate how high its dropping point is. The resulting grease carries unknown performance characteristics (load, temperature stability, shear, etc. It was made by reacting lithium hydroxide with fatty acids. Lithium grease is expensive due to its high raw material and production cost. Lithium greases are traditionally used in automotive and industrial applications such as bearings. Lithium grease was invented in the early 1940s. -How is intermediate and final temperature & ramp time during grease blending affect yield and grease properties? 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. The NLGI grease guide states a thickener is "the solid particles which are relatively uniformly dispersed to form the structure of lubricating grease in which the liquid is held by surface tension and other physical forces." Historically, thickeners have been classified as soaps or non-soaps. In this test, a simple soap grease will lose its structure as the temperature approaches that of its dropping point. Lithium salts are generally preferred to soaps with other counterions such as sodium, calcium, and barium. Products. Silicone grease is silicone oil based together with inert fillers thickened with a lithium soap. The penetration range at 77F (25C) is 265 to 295. Manufacturing. One needs to look at the product data sheets for the choice picked. Simple metallic soaps are made by reacting the metallic alkali with a monobasic organic acid. [3]. Lithium greases using a thickener formed by reacting a simple lithium soap with an acid are known as lithium complex greases and have higher dropping points as well as improvements to other properties.[6]. 3, Fig. More than 90% of all bearings have grease as a lubricant. For starters, almost 70% of grease on the market is lithium soap-based grease! dropping point, then compared to standard lithium 12-HSA and lithium complex formulations produced in-house with the same base oil. The penetration range at 77F (25C) is 265 to 295. While lithium soap-based grease has a long list of benefits, it does also have a few disadvantages, including: Simple lithium soap-based greases had been the mainstay of the industry until lithium complex greases became popular in the early 1980s. Lithium/Lithium Complex: The majority of greases sold worldwide are made with a simple lithium soap or lithium complex thickener. In addition to that, in either of the mentioned combinations, another additive can be combined, like molybdenum disulfide for example, in order (in this case) to improve grease's resistance to extreme . It is the most preferred bearing grease in almost all industrial sectors. Complex lithium thickeners can perform in higher temperature environments, and they also offer improved structural stability, improved shear stability and lower oil bleed while still maintaining the best characteristics of simple lithium thickeners. For example, solvent neutrals SN600, SN500, and N600, and N500 (neutrals), etc. Over time, if the oil separates too much in storage, it may be impossible for the grease to be reconstituted for use. April 1, 2017. Better water resistance properties compared to sodium soap greases. The main components of lithium soaps are lithium stearate and lithium 12-hydroxystearate.[4]. [4], Lower water resistance than calcium greases. Excellent water resistance means that the grease stays in place and is not washed or sprayed off in wet conditions, reducing the need for frequent re-application. First, let's define what a grease thickener is. Lithium soap greases resist shearing . Simple lithium greases are widely used and very effective for basic, all-purpose greasing. Lithium/Lithium Complex: The majority of greases sold worldwide are made with a simple lithium soap or lithium complex thickener. Simple lithium soaps are often used in low-cost general-purpose greases and perform relatively well in most performance categories at moderate temperatures. In the actual reaction process, 12-hydroxystearic acid and stearic acid as thickeners cannot completely saponify with lithium hydroxide to form soap fibers. Lithium Soap Lithium greases have good lubricity, shear ability, thermal resistance, and relatively low oil separation. Thus, it iskey you determine which thickener is best suited for use in your specific application. GMW16601. Soaps are salts of fatty acidsthey are prepared by heating a fat with a strong base. The brous structure of lithium soap thickener in grease was known from about that time through electron micrographs produced by Brown, Huddson, and Loring. Most greases have 75-98% paraffinic mineral base oils. materials? Synthetic oil: Lithium soap: 2 Oil separate prevention Lubricity: Noise Reduction Grease. Due to its high production and raw material costs, lithium grease is more expensive than other greases. Grease is one of the oldest lubricants used by humans dating back to 1400BC.[3]. -Any required ratio of LiOH:12 HSA:HCO to get maximum yield. For example, common grease additives areanti-corrosion,metal deactivators,antioxidants,and performance enhancement additives likeanti-wear propertiesand other characteristics. Lithium grease was invented in the early 1940s. Grease is one of the oldest lubricants used by humans dating back to 1400BC. The environmental impact of grease manufacturing plants and the use of grease is the domain of health and environmental sciences. It has lower adhesion properties, so it is not suitable for sliding or reciprocating applications. For high viscosity applications, it is a blend with bright stock. The metallic hydroxide used defines the thickener type. However, it shouldnt release too much oil during storage. Grease is one the oldest lubricants that humans have used since 1400BC. Copyright 2014-2021 Exxon Mobil Corporation. 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. Apart from this, naphthenic base stocks are dominant in grease applications because of their high solvency and better thickening power.Due to the higher price of synthetic fluids like PAO, they have limited use only.Vegetable oil greases are also available. -What is the difference between 2-HSA and HCO? (25) attributed the fiber shortening of lithium soap-based grease to the loss of physical bonding of thickener molecules at high temperature (120). "Numerous types of grease thickeners are currently in use, each with its own pros and cons. Angelo Nora, Alfred Szczepanek, Gunther Koenen, "Metallic Soaps" in Ullmanns Encyclopedia of Industrial Chemistry 2005 Wiley-VCH, Weinheim. Calcium greases have a higher water resistance than lithium grease. Table 1 is a lithium grease in mineral group I base oil. Lithium complex is the thickener that is most compatible with other thickeners. -50 C ( -60 F) and extremely high speeds (n dm values of 1,6 x 106 can be reached). GREASE NLGI 3 is for the long-term lubrication of rolling and slide bearings, also appropriate in case of high loads. [3] Add the initial base oil (40-60% of total base oil) to an open kettle, start heating and mixing. In most cases, lithium soap-based greases offer so many advantages that the additional cost is easily offset by increased performance. (Lithium soapthickens the oil.) Invented in 1938, the production of lithium grease is still higher than all the other greases combined. If youre responsible for lubricating machinery in a plant or factory, choosing the right grease is important. Use Temperature: -22 to 284. Since lithium complex greases contain a second thickener component, known as the complexing agent, the dropping point is higher than that of simple lithium soap greases. PLEASE INFORM. More than 90 % of thickeners are soap based. Symbols. 1. Lithium soaps are used as lubricant components and form-release agents at relatively high temperatures. Lithium Complex. Similarly, the preferred base oil for high viscosity application is bright stock blend. Lithium soaps are very efficient thickeners. Introductory Guide to Acid Number Lubricant Analysis, Intro to Proper Journal Bearing Lubrication, Lubrication Management Practices to Improve Operations, How to Implement Operator-Driven Reliability, The Components of an Effective Lubrication Management Program, A high dropping point of 190-200C (374-392F), Depending on the base oil, a good low-temperature function. In particular, solvent refined (solvent neutral SN) and hydro-processed paraffinic base oil are preferred. Greases prepared from calcium soaps have improved water resistance over the lithium greases and good shear stability. Its Drop point lies between 177 - 204 C. The use of silicon oil and especially in dielectric grease is increasing. -How is shaft speed affect yield. Lastly, there are the complex soaps which are formed by reacting the alkali with a blend of a monobasic acid and a dibasic acid. Here are a few of the suitable uses: There are many factors to consider when choosing lithium soap-based grease. Primary Chemical Name is the standard name assigned to a chemical substance. The portion of the grease that determines the compatibility is the thickener. Simple lithium-based thickeners were developed in 1940 and are ideal for low to moderate temperature applications of 100 degrees Celsius or less. Lithium complex grease, the most popular in North America, is made with lithium hydroxide, 12 HSA, and azelaic acid. When they were first developed, calcium soap based greases were used to provide basic lubrication for a range of simple applications. Composition / Chemistry: Lithium Complex or Soap Thickener. Suitable for use at temperatures up to 130C (266F), Low, medium, and high-speed bearing grease, Gear lubrication for open and enclosed gears. Soap thickeners not only provide thickening agent, usually soap in a liquid lubricant and rigidity to grease and they also affect desired properties may also contain additives that upgrade. So, it is best to compare lithium soap-based grease to those using other thickeners, such as sodium and calcium soap thickeners. Introduction For the past 70 years, 12-HSA has been the dominant fatty acid used for lithium soap thickeners in lubricating greases, and today, lithium soap greases make up more than 70% of the commercially available When aluminum soap greases get too hot from bearing heated, they form stringy gels that cause sharp increases in torque and therefore additional work is required to turn a bearing. Water is still soluble in lithium hydroxide, but only in small amounts. also how can I attain transparent and crystal appearance in grease please tell. By comparison, Complex lithium-based thickeners were developed two decades later in 1962, and they are able to perform in higher temperature applications of more than 100 degrees Celsius. If you provide more services, kindly contact me via the mentioned e-mail. Lithium complex products have higher temperature tolerances and are found in off-highway applications with an addition of . A palm-grease is made using lithium eco-friendly palm-grease, for use in bearings, gear and soap thickener 15% and base oil 85% of total product. In the same way, its viscosity or consistency and flow properties fall under rheology (the science of flow). Its mechanical effect as a lubricant between the two moving objects is in the field of physics. A grease composition for resin lubrication, the grease composition to be applied to a sliding surface made of resin, the grease composition comprising: a fluorine-based base oil and a synthetic hydrocarbon oil; a fluorine-based thickener, and one of a lithium soap thickener or a lithium complex soap thickener; a fluorine-based surfactant; and an extreme pressure additive, wherein, the . Grease is a lubricant that reduces friction, resists water, and seals. According to a recent NLGI survey, the production of lithium greases is higher than all other greases combined. Historically, thickeners have been classified as soaps or non-soaps. Lithium grease is probably the best multi-purpose grease ever developed. But, what is the best option for your application? Excellent rust inhibiting properties. And, while complex calcium soap based thickeners could withstand higher operating temperatures of up to 260 degrees Celsius, the arrival of higher performing lithium-based thickeners in the mid-20th century made these less advanced greases outdated. Temperature, environment, and type of equipment all need to be considered when making a selection. Not applicable.. GMW16601. [1][2] Sodium-based and potassium-based soaps are used as cleaning agents in domestic and industrial applications, whereas lithium soaps are used as components of lithium grease (white lithium). But due to the high price of silicon oil, it has limited use.Esters and PAO-based greases are only for demanding applications due to the very high cost of the synthetic base fluids. Use it in normal bearing applications. Home / Blog / What is Lithium Soap-Based Grease?. OEM meets requirements of Hino , Isuzu , Honda , Mitsubishi . There are three types of soap-based thickeners: Simple soap Simple soap results from the reaction of one fatty acid, such as 12 hydroxy stearic acid (12 HSA), and a metallic hydroxide, such as lithium hydroxide. While they are worth a mention as they are the first modern greases, having been developed in the late 1800s, Calcium soap based greases are used less and less today. Boom bust Boom. TO MAKE 90 GRADE OIL HOW MUCH QUANTITY VI SHOULD BE MIXED IN BASE OIL. So, why is the selection of a grease thickener so important? U.S. Patent 2,417,428 was granted to Lester W. McClennan on March 18, 1947. The soap is formed by reaction of lithium hydroxide with the mixture of fatty acid and dibasic acid. Good lubricity, shear stability, thermal resistance, low oil separation, Improved water resistance over the lithium greases, good shear stability, Used in applications that operate up to 110C, bearings of water pump, wheel bearings, and agricultural vehicles, High dropping points (typically 175C), good shear stability and lubricity, Excellent oxidation resistance, good water resistance, Vibrating screens, elevator drive motors and governors where reversing motion occurs, and large electric motors with bearings operating at high linear speeds. Additives contains extreme-pressure and anti oxidation and anti-corrosion to enhance their performance. Greases made with simple lithium soap thickeners first appeared in the 1940s, starting with Clarence Earle's 1942 patent (U.S. 2,274,675). Mixed soap greases were developed to improve the short comings of individual simple soap greases. Lithium grease remains stable in high temperature compare to Silicone grease. Introduction. [6] Grease, as we know it today, is a three dimensional network of thickener particles. The lithium soap thickener appears like shorter and less intricate fibres network, while the calcium soap thickener remains dispersed in the grease matrix in form of larger spherical granules, with sizes of around 2-4 m. You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long. Similarly, manufacturers use naphthenic base oils to achieve better thickening by soaps and low-temperature fluidity. Lithium soap is the thickener that turns the base oil into grease. Thickening by silica, and add other additive. [1]. Complex greases are made by combining the metallic soap with a complexing Simple lithium greases are widely used and very effective for basic, all-purpose greasing. taking into consideration compatibility. We welcome your ideas, request, or comments about Redlist. Lubricating greases are commonly formulated as mixtures of an oil and a lithium soap thickener. 1. How to Check Transmission Fluid Without Dipstick, Lithium Grease: Composition, Formulations, and Applications, Calcium Grease: Composition, Formulations, and Applications, NLGI Grease Consistency, Classifications and Applications, Base Fluid SpectraSyn 100 (Synthetic G IV), About 2-20% of thickener system (thickener transforms a liquid base oil into a grease) [2], Multipurpose grease for automotive, industrial, and marine, Multipurpose lubricant with operating temperature not exceeding 130C (266F), Bearing grease for low, medium, and high speed*. Both formulations are for illustrative purposes only. For example, lithium soap based thickener can be used with either mineral, or synthetic base oils to achieve different grease characteristics. Thickener transforms liquid lubricant (base oil) into a semi-solid grease. MOLYKOTE 55 O-Ring Grease is formulated from a high-quality silicone base oil with added synthetic ester and a lithium soap thickener. October 1, 2011. Use it in normal bearing applications. The grease composition of claim 1 , where the amount of thickener and any. The most common types are simple lithium soaps, lithium complex and polyurea. GREASE NLGI 3 reduces wear thanks to its very good resistance to high pressure.

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