silicone oil wikipedia
It is particularly known for its unusual rheological properties. They are typically colorless, oils or rubber-like substances. Grease is a semisolid lubricant.
Any liquid polymerized siloxane with organic side chains, "Space Station User's Guide, ISS Elements: Service Module ("Zvezda")". 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. Polydimethylsiloxane (PDMS), also known as dimethylpolysiloxane or dimethicone, belongs to a group of polymeric organosilicon compounds that are commonly referred to as silicones. Sealants may be weak or strong, flexible or rigid, permanent or temporary. These polymers are of commercial interest because of their relatively high thermal stability and their lubricating properties. The Silicone Oil Aerosol is 100% Ozone Friendly.  Additionally, silicone oil is used in general medicine and surgery. Their temperature stability and good heat-transfer characteristics make them widely used in laboratories for heating baths ("oil baths") placed on top of hotplate stirrers, as well as in freeze-dryers as refrigerants. Additives comprise up to 5% by weight of some oils. It is used for heat-transfer abilities, rather than friction reduction. 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. In this context they are often referred to as dielectric grease. Commonly used agents are insoluble oils, polydimethylsiloxanes and other silicones, certain alcohols, stearates and glycols. Oil additives are chemical compounds that improve the lubricant performance of base oil. Many groups can be attached to the tetravalent silicon centres, but the dominant substituent is methyl or sometimes phenyl. The property of reducing friction is known as lubricity. Some applications also require the coolant to be an electrical insulator. Thermal grease often consists of a silicone-grease base, along with added thermally conductive fillers. Silicones have a wide range of commercial applications, from lubricating greases to biomedical implants. The phenoxy groups in the former class of polymers do not contain any substituents whereas those in the latter class contain 2 to 4 alkyl groups on the phenyl ring. Silicone oil is a liquid polymer - specifically poly(dimethylsiloxane) - and therefore its boiling point ultimately depends upon its molecular weight. It is one of several types of silicone oil. Either class can have the oxygen atoms attached at various positions around the rings.
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. This page was last edited on 25 December 2019, at 16:59. Pure silicone grease is widely used by the plumbing industry in faucets and seals, as well as in dental equipment. Jump to navigation Jump to search. It can be used to lubricate fountain pen filling mechanisms and threads. Silicone rubber is generally non-reactive, stable, and resistant to extreme environments and temperatures from −55 to 300 °C while still maintaining its useful properties.
Most commonly, the silicone oil is polydimethylsiloxane (PDMS) and the thickener is amorphous fumed silica.Using this formulation, silicone grease is a translucent white viscous paste, with exact properties dependent on the type and proportion of the components.  They are excellent electrical insulators  and, unlike their carbon analogues, are non-flammable. Mineral oil is any of various colorless, odorless, light mixtures of higher alkanes from a mineral source, particularly a distillate of petroleum, as distinct from usually edible vegetable oils. They are sometimes added to cooking oils to prevent excessive foaming during deep frying. Silicone oil is also commonly used as the working fluid in dashpots, wet-type transformers, diffusion pumps and in oil-filled heaters. Common hydraulic fluids are based on mineral oil or water.
lubrication oil . The impurity may be carried through purification by chromatography in undesirable amounts. 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. Some common forms include silicone oil, silicone grease, silicone rubber, silicone resin, and silicone caulk. It functions well as a corrosion inhibitor and lubricant on non-metal-metal contact areas. Due to these properties and its ease of manufacturing and shaping, silicone rubber can be found in a wide variety of products, including: voltage line insulators, automotive applications; cooking, baking, and food storage products; apparel such as undergarments, sportswear, and footwear; electronics; medical devices and implants; and in home repair and hardware with products such as silicone sealants. The functional group R3SiO− (where the three Rs may be different) is called siloxy. 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. The characteristic feature of greases is that they possess a high initial viscosity, which upon the application of shear, drops to give the effect of an oil-lubricated bearing of approximately the same viscosity as the base oil used in the grease. Silicone oils used as lubricants can be inadvertent defoamers (contaminants) in processes where foam is desired, such as in the manufacture of polyurethane foam. Silicone oil is also one of the two main ingredients in Silly Putty, along with boric acid. , Silicone grease can decompose to form an insulating layer at or next to switch contacts that experience arcing, and contamination can cause the contacts to prematurely fail.. A silicone oil is any liquid polymerized siloxane with organic side chains. Silicones are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. 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. Polypropylene is another common polyolefin which is made from the olefin propylene. The most important member is polydimethylsiloxane. Depending on context and on which type of cutting fluid is being considered, it may be referred to as cutting fluid, cutting oil, cutting compound, coolant, or lubricant. 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. References This page was last changed on 16 May 2015, at 15:11. Sealants are not adhesives but some have adhesive qualities and are called adhesive-sealants or structural sealants. The siloxane functional group forms the backbone of silicones, the premier example of which is polydimethylsiloxane. More specialized silicone greases are made from fluorinated silicones or, for low-temperature applications, PDMS containing some phenyl substituents in place of methyl groups. A siloxane is a functional group in organosilicon chemistry with the Si−O−Si linkage. Various household uses include lubricating door hinges, shower heads, threads on bolts, garden-hose threads or any thread or mechanism that can be lubricated.
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