What is Lithium 12-hydroxystearate? Lithium 12-hydroxystearate chemical formula is C18H35LiO3. Lithium 12-hydroxystearate is a compound that is classified as lithium soap. In chemistry, "soap" refers to salts of fatty acids. Lithium 12-hydroxystearate is a white solid. Lithium soap is a key ingredient in many greases. Lithium 12-hydroxystearate has been widely considered as the preferred fatty acid for the manufacture of lithium-based grease thickeners. Greases prepared with this acid are usually smooth and have a butter-like texture.
What is Lithium 12-hydroxystearate Used for? Lithium 12-hydroxystearate is used as a thickener and gelling agent in lubricating grease.
Lithium 12-hydroxystearate has high oxidation stability with a drop point of about 200 °C. At present, most greases used in motor vehicles, aircraft and heavy machinery contain lithium stearate, mainly lithium 12-hydroxystearate. Some greases are made of sodium, barium, lithium and calcium soaps. Lithium soap-based grease is favored because of its water resistance, oxidation stability and mechanical stability. According to the difference of grease, they also have good performance at high or low temperature.
How to produce Lithium 12-hydroxystearate? In order to produce lithium 12-hydroxystearate, lithium hydroxide and fatty acids are combined in an aqueous medium. Through strong stirring, diluted lithium hydroxide monohydrate is gradually added to fatty acid dispersions heated to water slightly below the boiling point. Because these lithium soaps are difficult to filter, they are collected by spray drying. In terms of application, lithium 12-hydroxystearate is usually dispersed in synthetic oils such as silicone oil and ester oil. Synthetic oils are favored because of their higher stability and performance at extreme temperatures.
12-hydroxystearic acid is obtained by hydrogenation of castor oil. After most of the primary reactions of double bond saturation, the dehydration and reduction of hydroxyl groups lead to stearic acid. Hydrogenated castor oil produces a mixture of 12-hydroxy stearic acid and stearic acid.
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