very nice please share lithium complex formulation. For starters, almost 70% of grease on the market is lithium soap-based grease! There are only a few other thickeners that are not compatible with lithium complex, when using one of the Graco greases. Lithium 12-hydroxy stearate greases are the most widely used soap greases. Non-Soap Greases One needs to look at the product data sheets for the choice picked. Career. Available as an extreme pressure (EP) grease, which adds high load and anti-wear abilities. Complex soaps. The modern lithium soap (thickener), consists of 12HSA (12 hydroxystearic acid or triglycerides) mixed with lithium hydroxide monohydrate in an oil base. Thereis a wide variety of soap greases to choose from and they all have different physical properties where the application requirements dictate which soap is best. Caltex Molytex EP 2 Lithium Grease offers further protection through the presence of rust and corrosion inhibitors and molybdenum disulfide solid lubricant. Hello! 1347613 [LMCG1/0.4 from SKF Group (The)] from RS Components, Ltd. Lithium grease is probably the best multi-purpose grease ever developed. If you provide more services, kindly contact me via the mentioned e-mail. GREASE NLGI 3 is for the long-term lubrication of rolling and slide bearings, also appropriate in case of high loads. Silicone grease is silicone oil based together with inert fillers thickened with a lithium soap. Lithium grease is probably the best multi-purpose grease ever developed. MOLYKOTE 33 Extreme Low Temp Bearing Grease (Light) is a premium silicone-based lubricant formulated with a lithium-soap thickener for excellent long-term performance. "Numerous types of grease thickeners are currently in use, each with its own pros and cons. The invention provides a process for the preparation of a lithium soap thickened grease which consists of heating a mixture of an oil and a lithium base, and optionally also a calcium base, to at least 100 C., then adding a C 10-24 saturated or unsaturated fatty acid, and heating the resulting mixture at a temperature in the range 110 C. to 200 C. until a thickened grease is obtained. Greases prepared from calcium soaps have improved water resistance over the lithium greases and good shear stability. Lubricating greases are commonly formulated as mixtures of an oil and a lithium soap thickener. For example, lithium soap based thickener can be used with either mineral, or synthetic base oils to achieve different grease characteristics. 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. In the actual reaction process, 12-hydroxystearic acid and stearic acid as thickeners cannot completely saponify with lithium hydroxide to form soap fibers. Lubrication grease is a mixture of oil and soap or another thickener. . Greases consist 75-98% of base oil. These thickener types have an advantage over simple soap because of better high-temperature properties. Due to its high production and raw material costs, lithium grease is more expensive than other greases. Excellent rust inhibiting properties. The environmental impact of grease manufacturing plants and the use of grease is the domain of health and environmental sciences. SKF LGLT 2 is a fully synthetic oil based grease using lithium soap. At 88-90C (190-194F), add lithium hydroxide monohydrate slurry while mixing over 20-30 minutes. First, lets define what a grease thickener is. The most common mixed soap grease is lithium/calcium as the lithium will improve the high temperature resistance of the resulting grease while the calcium improves the water washout and cost. Temperature, environment, and type of equipment all need to be considered when making a selection. The price increase was driven by China's subsidy-driven roll . Please register to get access to our Customer Portal where youll be able to download our Technical Datasheets and White Papers. In particular, solvent refined (solvent neutral SN) and hydro-processed paraffinic base oil are preferred. Lithium complex greases were developed in the late 1940s. Grease & Paste could be separated into different performance range, like different temperature range resistance, thermal conductivity range, food . Lithium greases provide good lubricity and have great shear stability, thermal resistance and relatively low oil separation. Although they are more expensive to manufacture than other grease types, lithium soap greases offer so many advantages compared to sodium and calcium soap thickeners that extra cost is offset by improved performance. Mineral paraffinic base oils along with naphthenic are prevalent to manufacture greases. Not applicable.. GMW16601. Lithium soap complex. Not all greases are created equal some will withstand high temperatures, while others are better at resisting water and other contaminants. Lithium Soap Thickeners Lithium-based greases are among the most commonly used greases today, as they offer multi-purpose properties, good low-temperature performance and mechanical stability, low oil bleed tendency, good pumpability and good long-term storage stability. The dropping point of 190-200C (374-392F) is lower for many high-temperature applications. Whereas table 2 is a synthetic PAO formulation. 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. However, simple lithium soap-based greases are often the most economical choice for specific applications. The thickener system provides a high dropping point, excellent resistance to water wash, and a tenacious structural stability. They perform well in a wide range of applications due to their versatility. 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. 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. These thickener particles adhere to each other and the oil matrix through chemical and physical forces. Calcium greases have a higher water resistance than lithium grease. But the use of 12HSA along with HCO (hydrogenated castor oil) is most preferred. Simple lithium greases are widely used and very effective for basic, all-purpose greasing. Thickener transforms liquid lubricant (base oil) into a semi-solid grease. as saponification, soap dissolution, re-crystallization and The purpose of this research is to prepare an homogenization [8]. Complex soaps are also used widely as grease thickeners. Mixing greases in a system can cause issues with thickener systems reacting with each other. Lithium complex grease has excellent heat and water resistance and rust preventing property, as well as longer life at high temperature than lithium soap grease. . [5] Some formulations include PTFE or other substances, such as molybdenum disulfide. Angelo Nora, Alfred Szczepanek, Gunther Koenen, "Metallic Soaps" in Ullmanns Encyclopedia of Industrial Chemistry 2005 Wiley-VCH, Weinheim. Lithium complex products have higher temperature tolerances and are found in off-highway applications with an addition of . 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. Use it in normal bearing applications. Lithium soap greases resist shearing . Its unique thickener technology and low viscosity oil (PAO) provide excellent lubrication performances at low temperatures. Additives are required to improve performance or to meet current standards and specifications. Simple lithium greases are widely used and very effective for basic, all-purpose greasing. Thus, it iskey you determine which thickener is best suited for use in your specific application. Required fields are marked *. Types of Non-Soap Thickeners The penetration range at 77F (25C) is 265 to 295. 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. Copyright 2014-2021 Exxon Mobil Corporation. ). Calcium, lithium, aluminum, barium, polyuria, even clay - you'll see greases made with these kind of thickeners. So, it is best to compare lithium soap-based grease to those using other thickeners, such as sodium and calcium soap thickeners. 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. Calcium. 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. Base oils can be mineral oils or synthetic fluids, or a blend of any or both. 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. Table 1 is a lithium grease in mineral group I base oil. Composition / Chemistry: Lithium Complex or Soap Thickener. Its mechanical effect as a lubricant between the two moving objects is in the field of physics. View Details. Sodium soaps do provide good shear stability and lubricity. The EC Number, formerly known as the EINECS number is a unique 7-digit number (format: xxx-xxx-x) assigned to chemicals registered with the European Chemicals Agency (ECHA). Thickener Type. grease based on a Lithium-12-Hydroxy stearate soap for long time lubrication under high load. Chem LiHSA is Lithium 12 Hydroxystearate. More than 90 % of thickeners are soap based. We welcome your ideas, request, or comments about Redlist. In most cases, lithium soap-based greases offer so many advantages that the additional cost is easily offset by increased performance. -50 C ( -60 F) and extremely high speeds (n dm values of 1,6 x 106 can be reached). Lithium soap-based grease: In almost all industrial sectors, it is the most preferred bearing grease. NPC Grease is high quality multipurpose, extreme pressure grease based on formulation of high quality mineral oil and lithium soap thickener blened with additives to increase their performance in wide range of applications. The heat resistance of a grease can be measured by a temperature sweep test using a controlled stress rheometer. Make sure to use a valid business email address. Including but not limited to physics, chemistry, tribology, rheology, formulation, manufacturing, mechanical engineering, chemical engineering, and health and environmental sciences. Lithium soaps are very efficient thickeners. 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 soap-based grease is such a multipurpose grease that you can use for so many applications. GREASE NLGI 3 is a relative rigid grease. Lithium complex grease, the most popular in North America, is made with lithium hydroxide, 12 HSA, and azelaic acid. This premium quality, general purpose grease is suitable for a wide range of industrial and automotive applications requiring stiff grease. At this time, modern lithium soap (thickener) consists of 12HSA (12-hydroxystearic acid, or triglycerides) with lithium hydroxide monohydrate in a base fluid. It has lower adhesion properties, so it is not suitable for sliding or reciprocating applications. Soaps are salts of fatty acidsthey are prepared by heating a fat with a strong base.
Giorgio Armani Lipstick, Simmons University Dorm Rules, Codeigniter Get Request Data, Salmon Fish Fry Kerala Style, Jack White Fear Of The Dawn Drummer, Criminalmodz Fast Run Xbox, Restaurant Style Cheesecake, Starbound Stardust Core, Microsoft Remote Desktop Mac Setup,
