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The resulting mixture is then distilled. Uses[ edit ] In general, the applications of stearic acid exploit its bifunctional character, with a polar head group that can be attached to metal cations and a nonpolar chain that confers solubility in organic solvents.
The combination leads to uses as a surfactant and softening agent. Stearic acid undergoes the typical reactions of saturated carboxylic acids, a notable one being reduction to stearyl alcoholand esterification with a range of alcohols.
This is used in a large range of manufactures, from simple to complex electronic devices.
Soaps, cosmetics, detergents[ edit ] Stearic acid is mainly used in the production of detergents, soaps, and cosmetics such as shampoos and shaving cream products. Soaps are not made directly from stearic acid, but indirectly by saponification of triglycerides consisting of stearic acid esters.
Esters of stearic acid with ethylene glycolglycol stearateand glycol distearate are used to produce Review of related literature of soaps pearly effect in shampoos, soaps, and other cosmetic products. They are added to the product in molten form and allowed to crystallize under controlled conditions.
Detergents are obtained from amides and quaternary alkylammonium derivatives of stearic acid. Lubricants, softening and release agents[ edit ] In view of the soft texture of the sodium salt, which is the main component of soap, other salts are also useful for their lubricating properties.
Lithium stearate is an important component of grease.
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The stearate salts of zinc, calcium, cadmium, and lead are used to soften PVC. Stearic acid is used along with castor oil for preparing softeners in textile sizing.
They are heated and mixed with caustic potash or caustic soda. Related salts are also commonly used as release agentse. This section needs additional citations for verification.
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August Learn how and when to remove this template message Being inexpensive and chemically benign, stearic acid finds many niche applications. As an example, it can be used to make castings from a plaster piece mold or waste mold, and to make a mold from a shellacked clay original.
In this use, powdered stearic acid is mixed in water and the suspension is brushed onto the surface to be parted after casting. This reacts with the calcium in the plaster to form a thin layer of calcium stearatewhich functions as a release agent.
When reacted with zinc it forms zinc stearatewhich is used as a lubricant for playing cards fanning powder to ensure a smooth motion when fanning. Stearic acid is a common lubricant during injection molding and pressing of ceramic powders.
Stearic acid is used as a negative plate additive in the manufacture of lead-acid batteries. It is added at the rate of 0. It is believed to enhance the hydrophobicity of the negative plate, particularly during dry-charging process.
It also reduces the extension of oxidation of the freshly formed lead negative active material when the plates are kept for drying in the open atmosphere after the process of tank formation. As a consequence, the charging time of a dry uncharged battery during initial filling and charging IFC is comparatively lower, as compared to a battery assembled with plates which do not contain stearic acid additive.
Fatty acids are classic components of candle -making. Stearic acid is used along with simple sugar or corn syrup as a hardener in candies. In fireworksstearic acid is often used to coat metal powders such as aluminium and iron. This prevents oxidation, allowing compositions to be stored for a longer period of time.
Metabolism[ edit ] An isotope labeling study in humans  concluded that the fraction of dietary stearic acid that oxidatively desaturates to oleic acid is 2. Also, stearic acid is less likely to be incorporated into cholesterol esters.
In epidemiologic and clinical studies, stearic acid was found to be associated with lowered LDL cholesterol in comparison with other saturated fatty acids.Handmade Happy Soaps, Bath Bombs, and Body Scrubs, since We make natural soaps, bath bombs, sugar scrubs and body butter always with a focus on colorful, fun and top shelf ingredients.
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