silicone oil wikipedia

Compare this product Remove from comparison tool. Its applications range from contact lenses and medical devices to elastomers; it is also present in shampoos, food, caulking, lubricants and heat-resistant tiles. They are excellent electrical insulators [2] and, unlike their carbon analogues, are non-flammable. Cutting fluid is a type of coolant and lubricant designed specifically for metalworking processes, such as machining and stamping. Learn how and when to remove this template message, "NMR Chemical Shifts of Trace Impurities: Common Laboratory Solvents, Organics, and Gases in Deuterated Solvents Relevant to the Organometallic Chemist", https://en.wikipedia.org/w/index.php?title=Silicone_grease&oldid=981454785, Creative Commons Attribution-ShareAlike License, This page was last edited on 2 October 2020, at 12:15. A polyolefin is a type of polymer produced from a simple olefin as a monomer. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces. Silicone greases are electrically insulating and are often applied to electrical connectors, particularly those containing rubber gaskets, as a means of sealing and protecting the connector. "Lubricants and Lubrication" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Weinheim. This grease improves water resistance of the flashlights and protects threads from wearing out. Silicone oil has been commonly used as the fluid in the automobile cooling fan clutch assemblies, and is still being used in the newer electronic fan clutches. Silicone oil is also one of the two main ingredients in Silly Putty, along with boric acid. Silicones are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. Sealants are not adhesives but some have adhesive qualities and are called adhesive-sealants or structural sealants. It is particularly known for its unusual rheological properties. Silicone oils used as lubricants can be inadvertent defoamers (contaminants) in processes where foam is desired, such as in the manufacture of polyurethane foam. Synthetic lubricants can be manufactured using chemically modified petroleum components rather than whole crude oil, but can also be synthesized from other raw materials. The base material, however, is still overwhelmingly crude oil that is distilled and then modified physically and chemically. The siloxane functional group forms the backbone of silicones, the premier example of which is polydimethylsiloxane. Silicone greases generally have an operating temperature range of approximately −40 to 200 °C (−40 to 392 °F) with some high-temperature versions extending this range slightly. Most commonly, the silicone oil is polydimethylsiloxane (PDMS) and the thickener is amorphous fumed silica. The structure of an oxygen-containing PPE is provided in Figure 1 and that of a 2, 6-xylenol derived PPO is shown in Figure 2. PDMS is the most widely used silicon-based organic polymer due to its versatility and properties leading to a manifold of applications. [3][4] Various household uses include lubricating door hinges, shower heads, threads on bolts, garden-hose threads or any thread or mechanism that can be lubricated. [6], Lubrication of an apparatus with silicone grease may result in the reaction mixture being contaminated with the grease. Polypropylene is another common polyolefin which is made from the olefin propylene. Silicone rubber is an elastomer composed of silicone—itself a polymer—containing silicon together with carbon, hydrogen, and oxygen. It is insoluble in methanol, ethanol, and water.[2]. Silicone grease is commonly used for lubricating and preserving many types of rubber parts, such as O-rings, without swelling or softening the rubber, but is contraindicated for silicone rubber due to these factors. Common hydraulic fluids are based on mineral oil or water. Other thickeners may be used, including stearates and powdered polytetrafluorethylene (PTFE). [5] Related Research Articles. Silicone grease is soluble in organic solvents such as toluene, xylene, mineral spirits, and chlorinated hydrocarbons. Siloxanes are manmade and have many commercial and industrial applications because of the compounds’ hydrophobicity, low thermal conductivity, and high flexibility. Some applications also require the coolant to be an electrical insulator. This change in viscosity is called shear thinning. Sealants may be weak or strong, flexible or rigid, permanent or temporary. Silicone oil is also commonly used as the working fluid in dashpots, wet-type transformers, diffusion pumps and in oil-filled heaters. This page was last edited on 25 December 2019, at 16:59. A hydraulic fluid or hydraulic liquid is the medium by which power is transferred in hydraulic machinery. A siloxane is a functional group in organosilicon chemistry with the Si−O−Si linkage. Its main purpose is to prevent or rapidly quench electric discharges. Other silicone liquids are cyclosiloxanes. Silicone oil silicon oil. Most commonly, the silicone oil is polydimethylsiloxane (PDMS) and the thickener is amorphous fumed silica. Grease is a semisolid lubricant. Like all siloxanes (e.g., hexamethyldisiloxane), the polymer backbone consists of alternating silicon and oxygen atoms (...Si−O−Si−O−Si...). Thermal grease often consists of a silicone-grease base, along with added thermally conductive fillers. Silicone grease is used with waterproof devices, as it has a very thick body and doesn't dissolve in water as most spirits and other liquids would. The parent siloxanes include the oligomeric and polymeric hydrides with the formulae H(OSiH2)nOH and (OSiH2)n. Siloxanes also include branched compounds, the defining feature of which is that each pair of silicon centres is separated by one oxygen atom. From Wikimedia Commons, the free media repository, Λάδια σιλικόνης (el); Silikónový olej (sk); silikonolje (nn); Silikonový olej (cs); زيت السليكون (ar); Силиконовое масло (ru); 矽油 (zh); Silikonöle (de); 실리콘오일 (ko); silicone oil (en); روغن‌های سیلیکون (fa); 硅油 (zh-hans); Silikoneolie (da) οποιοδήποτε υγρό πολυμερισμένο σιλοξάνιο με οργανικές πλευρικές αλυσίδες. For example, petroleum jellies such as Vaseline are not generally classified as greases. Silicone, any of a diverse class of fluids, resins, or elastomers based on polymerized siloxanes, substances whose molecules consist of chains made of alternating silicon and oxygen atoms. [3]. In 13C NMR, it appears at δ = 1.19 ppm in CDCl3 and 1.38 ppm in C6D6. Many silicone liquids are linear polymers end-capped with trimethylsilyl groups. Jump to navigation Jump to search. It can be used to lubricate fountain pen filling mechanisms and threads. Other thickeners may be used, including stearates and powdered polytetrafluorethylene (PTFE).[1]. They are used in industrial applications such as distillation or fermentation, where excessive amounts of foam can be problematic. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, chemically inert and neither causes nor promotes corrosion of the cooling system. Dry lubricants or solid lubricants are materials that, despite being in the solid phase, are able to reduce friction between two surfaces sliding against each other without the need for a liquid oil medium. An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. Its function is to provide electrical insulation, suppress corona and arcing, and to serve as a coolant. Haiduc, I., "Silicone Grease: A Serendipitous Reagent for the Synthesis of Exotic Molecular and Supramolecular Compounds", Organometallics 2004, volume 23, pp. In NMR spectroscopy, the methyl groups in polydimethylsiloxane display 1H and 13C chemical shifts similar to trimethylsilane (TMS), the reference compound for those forms of NMR spectroscopy. The property of reducing friction is known as lubricity. 3–8. Silicone oils are primarily used as lubricants, thermic fluid oils or hydraulic fluids. Aerospace use includes the external coolant loop and radiators of the International Space Station Zvezda module, which rejects heat in the vacuum of space. The additive is used to prevent formation of foam or is added to break a foam already formed.

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