What is the difference between liquid silicone and silicone?

Elastomer

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An uncured piece of liquid silicone rubber

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.

Curing

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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.

Platinum-based cure system

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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]

Condensation cure system

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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 systems

Two-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.

Peroxide cure system

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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 (compare cumene hydroperoxide), has principal breakdown products of acetophenone and phenyl-2-propanol. The other is dichlorobenzoyl peroxide, whose principal breakdown products are dichlorobenzoic acid and dichlorobenzene.[6]

Crosslinking by organic peroxides

History

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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 .[7]

Properties

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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.[8] 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.[9][10][11]

Compared to organic rubber

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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 and does not react with most chemicals and isn&#;t 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.).[12]

Property Value Appearance Hardness, Shore A 25&#;90 Tensile failure stress, ultimate 1,400&#;10,300 kPa (200&#;1,500 psi) Elongation after fracture in % &#; 700% maximum Density Can be compounded from 0.95 to over 1.20 g/cm3

Production

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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.[13] 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.

Structure

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Silicone rubber chain Repeat unit of silicone rubber

Polysiloxanes 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.[14]

Mechanical properties (Polymax )[

citation needed

] Hardness, shore A 10&#;90 Tensile strength 11 N/mm2 Elongation at break 100&#; % Maximum temperature 300 °C Minimum temperature &#;120 °C

Special grades

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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.

Applications

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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.

Extrusion

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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.

Injection moulding

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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.

3D printing

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Silicone 3d print with support material

Silicone 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.[15]

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).[16]

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.

Electrical insulation

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Silicone rubber is used as an electrical insulator in power cables and cable joints.[17] 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.[18]

In , silicone rubber formed the matrix of the first autonomic self-healing elastomer.[19] 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.[20]

See also

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References

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Further reading

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• Brydson, John () Plastics Materials, Butterworth, 9th Ed
• Lewis, PR, Reynolds, K and Gagg, C () Forensic Materials Engineering: Case Studies, CRC Press

No matter what you&#;re purchasing, it&#;s always good to know your options. Not all products are created equal. Usually they are differentiated by their build quality which includes the design, manufacturing process, and materials used. In order to set your product up for success, its best to start with quality raw materials. Already, many engineers and manufacturers have discovered the advantages of using silicone rubber to create amazing new products. Silicone has grown in popularity due to its versatility, resistance to change, reliability, and durability. However, even within the silicone family there are options to choose from. At the most basic level, silicone can be divided into two major categories: solid and liquid.

Solid
The difference between solid and liquid silicone rubber is due to its makeup at a chemical level. Solid silicone contains polymers with a high molecular weight and relatively long polymer chains. Typically, solid silicone is produced in bars and other solid shapes. These bars are then able to be molded into the desired product. Solid silicone is a simple solution for many basic products, but it is limited compared to the versatility and customization of liquid silicone.

Liquid
On the other hand, Liquid silicone rubber contains polymers of lower molecular weight and shorter chains. One of the main advantages of liquid silicone is its versatility. In liquid form, this silicone is a blank canvas that can be customized with color options and additives. For example, if you need a chemical resistant product, SiTECH can synthesize liquid silicone with chemical resistant additives in order to create a highly resilient product. In many ways, silicone rubber is only limited by the imagination of the engineer or product designer. No matter what industry you are creating a product for, liquid silicone can be customized and molded to accomplish the task.

Silicone Technology Corp. is headquartered in Newport News, Virginia. We are proud to supply silicone products to many industries including medical, automotive, military, and so many more. We use a unique liquid injection molding process with Dow and GE Silicones. This combination of technology and quality offers you a competitive domestic supplier of custom keypads and other silicone rubber products. If you want to find out more about what makes SiTECH different from our competitors, give us a call today at 757-887-.

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