Silicone rubber is an elastomer (rubber-like material) composed of silicone&#;itself a polymer&#;containing silicon together with carbon, hydrogen, and oxygen. Silicone rubbers are widely used in industry, and there are multiple formulations. Silicone rubbers are often one- or two-part polymers, and may contain fillers to improve properties or reduce cost. Silicone rubber is generally non-reactive, stable, and resistant to extreme environments and temperatures from &#;55 to 300 °C (&#;70 to 570 °F) while still maintaining its useful properties. 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, in products such as silicone sealants.
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In its uncured state, silicone rubber is a highly adhesive gel or liquid. To convert it to a solid, it must be cured, vulcanized, or catalyzed. This is normally carried out in a two-stage process at the point of manufacture into the desired shape, and then in a prolonged post-cure process. It can also be injection molded or 3D printed.
Silicone rubber may be cured by a platinum-catalyzed cure system, a condensation cure system, a peroxide cure system, or an oxime cure system. For the platinum-catalyzed cure system, the curing process can be accelerated by adding heat or pressure.
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In a platinum-based silicone cure system, also called an addition system (because the key reaction-building polymer is an addition reaction), a hydride- and a vinyl-functional siloxane polymer react in the presence of a platinum complex catalyst, creating an ethyl bridge between the two.[1] The reaction has no byproducts. Such silicone rubbers cure quickly, though the rate of or even ability to cure is easily inhibited in the presence of elemental tin, sulfur, and many amine compounds.[2]
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Condensation curing systems can be one-part or two-part systems.[3] In one-part or RTV (room-temperature vulcanizing) system, a cross-linker exposed to ambient humidity (i.e., water) experiences a hydrolysis step and is left with a hydroxyl or silanol group. The silanol condenses further with another hydrolyzable group on the polymer or cross-linker and continues until the system is fully cured. Such a system will cure on its own at room temperature and (unlike the platinum-based addition cure system) is not easily inhibited by contact with other chemicals, though the process may be affected by contact with some plastics or metals and may not take place at all if placed in contact with already-cured silicone compounds. The crosslinkers used in condensation cure systems are typically alkoxy, acetoxy, ester, enoxy or oxime silanes such as methyl trimethoxy silane for alkoxy-curing systems and methyl triacetoxysilane for acetoxy-curing systems. In many cases an additional condensation catalyst is added to fully cure the RTV system and achieve a tack-free surface. Organotitanate catalysts such as tetraalkoxy titanates or chelated titanates are used in alkoxy-cured systems. Tin catalysts such as dibutyl tin dilaurate (DBTDL) can be used in oxime and acetoxy-cured systems. Acetoxy tin condensation is one of the oldest cure chemistries used for curing silicone rubber, and is the one used in household bathroom caulk. Depending on the type of detached molecule, it is possible to classify silicone systems as acidic, neutral or alkaline.[4]
Overview of the most commonly used silicone systemsTwo-part condensation systems package the cross-linker and condensation catalyst together in one part while the polymer and any fillers or pigments are in the second part. Mixing of the two parts causes the curing to take place. A typical filler is fumed silica, also known as pyrogenic silica, which used to control the flow properties of the sealant. [5]
Once fully cured, condensation systems are effective as sealants and caulks in plumbing and building construction and as molds for casting polyurethane, epoxy and polyester resins, waxes, gypsum, and low-melting-temperature metals such as lead. They are typically very flexible and have a high tear strength. They do not require the use of a release agent since silicones have non-stick properties.
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Peroxide curing is widely used for curing silicone rubber. The curing process leaves behind byproducts, which can be an issue in food contact and medical applications. However, these products are usually treated in a postcure oven which greatly reduces the peroxide breakdown product content. One of the two main organic peroxides used, dicumyl peroxide, has principal breakdown products of acetophenone and 2-phenyl-2-propanol. The other is 2,4-dichlorobenzoyl peroxide, whose principal breakdown products are 2,4-dichlorobenzoic acid and 1,3-dichlorobenzene.[6][7]
Crosslinking by organic peroxides[
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The first silicone elastomers were developed in the search for better insulating materials for electric motors and generators. Resin-impregnated glass fibers were the state-of-the-art materials at the time. The glass was very heat resistant, but the phenolic resins would not withstand the higher temperatures that were being encountered in new smaller electric motors. Chemists at Corning Glass and General Electric were investigating heat-resistant materials for use as resinous binders when they synthesized the first silicone polymers, demonstrated that they worked well and found a route to produce them commercially.
The term "silicone" is actually a misnomer. The suffix -one is used by chemists to denote a substance with a double-bonded atom of oxygen in its backbone. When first discovered, silicone was erroneously believed to have oxygen atoms bonded in this way. The technically correct term for the various silicone rubbers is polysiloxanes (polydimethylsiloxanes being a large subset), referring to a saturated Si-O backbone.[2]
Corning Glass in a joint venture with Dow Chemical formed Dow Corning in to produce this new class of materials. As the unique properties of the new silicone products were studied in more detail, their potential for broader usage was envisioned, and GE opened its own plant to produce silicones in . GE Silicones was sold to Momentive Performance Materials in . Wacker Chemie also started production of silicones in Europe in . The Japanese company Shin-Etsu Chemical began mass production of silicone in .[8]
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Silicone rubber offers good resistance to extreme temperatures, being able to operate normally from &#;100 to 300 °C (&#;150 to 570 °F). Silicone rubber has low tensile strength, poor wear and tear wear properties.[9] Some properties such as elongation, creep, cyclic flexing, tear strength, compression set, dielectric strength (at high voltage), thermal conductivity, fire resistance and in some cases tensile strength can be&#;at extreme temperatures&#;far superior to organic rubbers in general, although a few of these properties are still lower than for some specialty materials. Silicone rubber is a material of choice in industry when retention of initial shape and mechanical strength are desired under heavy thermal stress or sub-zero temperatures.[10][11][12]
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Organic rubber has a carbon-to-carbon backbone which can leave it susceptible to ozone, UV, heat and other aging factors that silicone rubber can withstand well. This makes silicone rubber one of the elastomers of choice in many extreme environments. Silicone is considerably more permeable to gasses than most other rubbers which limits its use in some areas.
Silicone rubber is highly inert, does not react with most chemicals, and is not available to participate in biological processes, allowing it to be used in many medical applications including medical implants. It is biocompatible, hypoallergenic, which makes it suitable for baby care products, and food contact in general. Silicone rubber is a reliable solution (as opposed to rubber and thermoplastic elastomers) for migration or interaction problems between the main active ingredients. Its chemical stability prevents it from affecting any substrate it is in contact with (skin, water, blood, active ingredients, etc.).[13]
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To make silicone, the silicon atoms must be isolated from the silicon dioxide compound silica. This is done by heating large volumes of quartz sand to extremely high temperatures, often up to °C. From here, there are several processes where silicon is combined with methyl chloride and heated. It is then distilled into a polymerised siloxane known as polydimethylsiloxane. The polydimethylsiloxane can then be polymerised. This is done using a variety of techniques depending on the use of the final product.[14] The raw silicone compound is combined with any desired additives, which may include pigments, and the catalyst. It is then injection moulded, extruded or 3D printed. Curing is the final stage in the production process.
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Silicone rubber chain Repeat unit of silicone rubberPolysiloxanes differ from other polymers in that their backbones consist of Si&#;O&#;Si units instead of C&#;C units. The large bond angles and bond lengths make polysiloxanes more flexible than basic polymers such as polyethylene. A C&#;C backbone unit has a bond length of 1.54 Å and a bond angle of 112°, whereas an Si&#;O backbone unit has a bond length of 1.63 Å and a bond angle of 130°. Polymer segments in polysiloxanes can move farther and change conformation easily, making for a flexible material. Polysiloxanes tend to be more stable and less chemically active because more energy is required to break the silicon-oxygen bond. Although silicon is a congener of carbon, having the same electron bonding configuration, silicon analogues of carbonaceous compounds generally exhibit different properties. The difference in total charge and mass between carbon with 6 protons and 6 neutrons, and silicon with 14 protons and 14 neutrons causes an added layer of electrons and their screening effect changes the electronegativity between the two elements. For example the silicon-oxygen bond in polysiloxanes is significantly more stable than the carbon-oxygen bond in polyoxymethylene, a structurally similar polymer. The difference is partly due to the higher bond energy, the energy required to break the Si-O bond, and also because polyoxymethylene decomposes formaldehyde, which is volatile and escapes driving decomposition forward, but Si-containing decomposition products of silicone are less volatile.[15]
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] Hardness, shore A 10&#;90 Tensile strength 11 N/mm2 Elongation at break 100&#; % Maximum temperature 300 °C Minimum temperature &#;120 °C[
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There are many special grades and forms of silicone rubber, including: steam resistant, metal detectable, high tear strength, extreme high temperature, extreme low temperature, electrically conductive, chemical/oil/acid/gas resistant, low smoke emitting, and flame-retardant. A variety of fillers can be used in silicone rubber, although most are non-reinforcing and lower the tensile strength.
Silicone rubber is available in a range of hardness levels, expressed as Shore A or IRHD between 10 and 100, the higher number being the harder compound. It is also available in virtually any colour, and can be colour matched.
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Silipi Technology are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.
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Silicone rubber is used in automotive applications, many cooking, baking, and food storage products, apparel including undergarments, sportswear, and footwear, electronics, to home repair and hardware, and a host of unseen applications. It is usually processed and shaped with the following methods.[16]
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Once mixed and coloured, silicone rubber can be extruded into tubes, strips, solid cord or custom profiles according to the size specifications of the manufacturer. Cord can be joined to make O-rings and extruded profiles can be joined to make seals.
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Silicone rubber can be moulded into custom shapes and designs. Manufacturers work to set industry tolerances when extruding, cutting or joining silicone rubber profiles. In the UK this is BS , for extrusions the tightest level is E1 and the widest is E3.
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Silicone 3d print with support materialSilicone rubber can be 3d printed (liquid deposition modelling LDM) using pump-nozzle extrusion systems. Unfortunately, standard silicone formulations are optimized to be used by extrusion and injection moulding machines and are not applicable in LDM-based 3D printing. The rheological behavior and the pot life need to be adjusted.[17]
3D printing also requires the use of a removable support material that is compatible with the silicone rubber.
Liquid silicone rubber is also manufactured for life science applications (syringe pistons, closure for dispensing system, gaskets for IV flow regulator, respiratory masks, implantable chambers for IV administration), cosmetic products (Mascara brush, make-up packaging, make-up applicator and lipstick moulds) and optics products (circular lens, collimators, Fresnel lenses and free form lenses).[18]
A silicone rubber pastry brush.Freeze-tolerant solar water-heating panels exploit the elasticity of silicone to repeatedly accommodate the expansion of water on freezing, while its extreme temperature tolerance maintain a lack of brittleness below freezing and excellent tolerance of temperatures in excess of 150 °C (300 °F). Its property of not having a carbon backbone, but a chemically robust silicon backbone instead, reduces its potential as a food source for dangerous waterborne bacteria such as Legionella.
Non-dyed silicone rubber tape with an iron(III) oxide additive (making the tape a red-orange colour) is used extensively in aviation and aerospace wiring applications as a splice or wrapping tape due to its non-flammable nature. The iron oxide additive adds high thermal conductivity but does not change the high electrical insulation property of the silicone rubber. This type of self-amalgamating tape amalgamates or fuses to itself, so that when stretched and wrapped around cables, electrical joints, hoses and pipes it bonds into a strong seamless rubbery electrically insulating and waterproof layer, although not adhesive. As an electrical insulator, silicone rubber has the added virtue of remaining non-conductive when damaged by heat, reducing the likelihood of runaway arcing.
With the addition of carbon or another conductive substance as a powdered filler, silicone rubber can be made electrically conductive while retaining most of its other mechanical properties. As such it is used for flexible contacts which close on being pressed, used in many devices such as computer keyboards and remote control handsets.
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Silicone rubber is used as an electrical insulator in power cables and cable joints.[16][19] Silicone-insulated cables are advantageous in that they can withstand temperatures from -90°C to 200°C, and are highly flexible. These properties make them suitable for maintaining circuit integrity in the event of a fire.[20]
In , silicone rubber formed the matrix of the first autonomic self-healing elastomer.[21] The microcapsule-based material was capable of recovering almost all of the original tear strength. Additionally, this material had improved fatigue properties as evaluated using a torsion-fatigue test.[22]
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So prevalent is it that we tend to take Silicone for granted without a second thought. As leading manufacturers of Dimensional Gel Pads for pressure ulcer prevention, we bring you a brief history of this remarkable product.
It&#;s a product that enhances our everyday lives, from Gel Ovations pressure relieving gel pads in healthcare, to cake moulds and construction to vital construction sealant.
It&#;s a unique material because of its versatility; for delicate uses such as teats of baby bottles, yet tough enough to be used in jet engines! This is because silicone rubber is stable enough to withstand extreme temperatures and environments, including extreme heat.
Technically silicone is a modern elastomer. It differs from the organic elastomers such as polyurethane, latex, and natural rubber options being mineral in nature. Silicone is made with silicon and oxygen, combined with carbon and hydrogen.
During the Stone Age, silica-based stones and quartz were used to create new tools. Oxygen and silicon are two of the most prevalent elements in the crust of the Earth, and you can mostly find them in rocks as silicates and silica.
These have been important since Ancient Times for both protection and for survival. Next, the Romans stepped in and started the transformation of silica into glass. Later, as soon as scientists learned this was how to make glass, they worked on solutions to extract silica from sand during the 19th century.
During the 19th century, silicone rubber was developed in leaps and bounds and it actually had to be discovered as an element first.
In , the Swedish chemist Jöns Jackob Berzelius was the first person to succeed in isolating silicon on its own. With techniques employing potassium, silicon was extracted before being heated in chlorine.
This then led to vigorous combustion and the result was the silicon tetrachloride which is used to produce silicones today. Although Berzelius is recognised as the founder of silicon, it was Henri Sainte-Claire Deville who discovered the more common crystalized form 31 years later.
During the process of electrolysis smelting, Deville obtained pure silicon and throughout the remainder of the 19th century, chemists continued their research. When we arrived in the mid-20th century, chemists developed silicone rubber for other commercial purposes.
Dr. James Franklin Hyde first researched how to produce those commercial silicones in .
His work combined the advantages of both glass and plastics, organic and inorganic chemistry. This lead to the commercial production of silicones at Dow Corning Corporation.
It was the British chemist, Frederick Stanley Kipping, who named the new material as silicones in . He thought that they were a sticky mess, but didn&#;t quite see the potential of silicone rubber, believing that there was no practical use for it.
In the later 20th century, the use of resins, elastomers and silicone rubber was rising. For example, the silicon used in computer chips was behind the naming of the famous Silicon Valley in the United States.
If you want to learn more, please visit our website Wholesale Rubber Silicone Products.