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Silicone rubber products

2019-04-25


Silicone products have good resistance to high and low temperatures, and generally work at 180 ° C for a long time. Silicone rubber can work for a long time at 250 ° C, and can withstand high temperatures of more than 1000 degrees Celsius. Silicone materials have good low temperature resistance and generally work at -55 °C. Some silicone rubbers are still elastic at -110 °C. Silicone materials have good electrical insulation properties, dielectric properties do not change drastically with temperature; dielectric constant does not increase with increasing frequency; and is resistant to arcing, corona, and leakage; ozone, radiation, and weathering It is difficult to burn, so it is extremely versatile. The following is a brief introduction to some of the main uses of silicone products in several major categories:

1. Silane Coupling Agent The silane coupling agent is a kind of low molecular compound. It is connected with one end of the silicon atom to be hydrolyzable chlorine or various alkoxy groups. After hydrolysis, it can be connected with inorganic substances. At the other end, there are various kinds of energy. The functional group acting on the organic phase, such as an amino group, a vinyl group, a thiol group or the like, allows the silane coupling agent to bridge the organic matter and the inorganic substance. There are nearly one hundred kinds of commonly used silane coupling agents. Glass fibers such as glass reinforced plastic are treated with a vinyl-containing coupling agent to increase the wet strength. The currently popular "green" tires use a large amount of silane-based silane coupling agent; polyethylene crosslinked with vinyl trialkoxysilane, which has a higher working temperature than ordinary polyethylene and polyvinyl chloride, is suitable for hot water production. Tube, cable sheath, etc.
2. Silicone silicone oils are low molecular weight polysiloxanes containing single or different organic groups and can be made into a variety of different viscosities. Silicone oil has a low surface tension and a large contact angle with water, and is a high-quality water-repellent material. Silicone oil has a small change in viscosity-temperature coefficient and does not solidify at low temperatures. It is a base oil for gyro oil, antifreeze and heat-resistant lubricating oil, hydraulic oil, instrument oil, etc., which are both high temperature resistant and low temperature resistant, and steam. Very low pressure high vacuum diffusion pump oil. The use of silicone oils or modified formulations thereof in cosmetics has grown rapidly in recent years. Silicone oil is not oily and not greasy on the skin, it feels smooth and comfortable, and can be made into various skin creams.
3. Silicone rubber According to the vulcanization mechanism, silicone rubber can be divided into high temperature vulcanized silicone rubber (HTV); room temperature vulcanized silicone rubber (RTV) and addition liquid silicone rubber (LSR), which have heat resistance, cold resistance, ozone resistance, ultraviolet resistance and resistance. Atomic oxygen, cosmic ray-resistant properties and comprehensive properties such as waterproof and shockproof. LSR liquid silicone rubber (also known as silicone gel) is an excellent potting and protection material for semiconductor chips and electronic devices; silicone gel with a transmittance of up to 91% is required to withstand high temperature, humidity and yellowing. The intermediate adhesive layer of the windshield glass. LSR silicone rubber mold glue is used for precision casting of engine components. The production of HTV and RTV accounts for a large share of silicone products (generally 40% to 50%), and HTV is more widely used than RTV.
(1) RTV room temperature curing silicone rubber RTV is generally made of hydroxy-terminated low molecular polysiloxane (107 gel), with catalyst, filler, etc. to make two-component or one-component, easy to use and can be cured at room temperature. Silicone rubber has good adhesion to various materials such as glass, ceramics, metal, concrete, etc. It is widely used in the bonding and sealing of structural parts such as full-view glass curtain wall, aluminum alloy doors and windows, and plugging in bathroom and toilet of the family. And caulking. RTV silicone rubber-based ablation resistant thermal barrier coatings have low thermal conductivity and are easy to construct. Thermal insulation materials for rocket tailpipes and returning spacecraft from ablation are also important for making aerospace components. material. RTV silicone rubber is also a flexible mold for all kinds of artistic carved decorative materials.
(2) HTV high temperature vulcanized silicone rubber HTV is a high molecular weight (400,000 to 800,000) polyorganosiloxane, added with reinforcing filler and other various additives, vulcanized, and formed into crosslinked rubber. HTV silicone rubber composite insulators for high-voltage transmission and transformation, not only 1/5 to 1/10 of the weight of porcelain insulators, but also easy to use, and good resistance to pollution flashover, can safely operate in high-voltage transmission and transformation power grids. HTV silicone rubber with carbon black or the like as a conductive medium is used as a key pad for a large number of keyboards for mobile phones and computers; silicone rubber is widely used for making shaft seals, gaskets, oil seals, industrial rubber rollers, shock absorbing rubber, and insulation. Products, medical products, etc. Silicone rubber insulated flame-retardant wires and cables are used in warships, airplanes, etc. where high reliability is required. Silicone rubber has the characteristics of physiological inertness, non-coagulation, simple disinfection, etc. It can produce silicone rubber parts that can be implanted into the human body and various silicone rubber catheters, cannulas, hydrocephalus drainage tubes, and peritoneal dialysis tubes that can be used for a long time. And artificial heart-lung machine blood transfusion pump tube. In addition, silicone rubber is breathable and has different permeability to different gases. The oxygen transmission rate is the highest among synthetic polymers, and it can be used as an oxygen-rich membrane or a gas separation membrane.
4. Insulation made of silicone resin is classified as H grade due to its good heat resistance and insulation properties. The motor made with it is small in size, light in weight and high in reliability, and will not be overheated or overloaded for a short period of time. Burned out. Silicone resin can be formulated to withstand high temperature coatings of 500 ° C; silicone modified acrylic resin coatings have good weather resistance, and water and stain resistance are advanced exterior wall coatings. Silicone plastic made of silicone can be used as a micro switch for high voltage, high current and arc resistance for aircraft engines. In short, the use of silicone materials is very extensive and the effect is very significant.

There are many types of silicone products classified into silicone products, which can be roughly divided into five categories, namely:
1. The most commonly used high temperature vulcanized silicone rubber is methyl vinyl silicone rubber, cold resistant phenyl silicone rubber, oil and solvent resistant fluorosilicone rubber and nitrile silicone rubber, and radiation resistant phenylene silicone rubber. It is provided to the user for the convenience of using the compounding compound.
2. Room temperature vulcanized silicone rubber has two components and one component in packaging form. The two components are divided into methyl, phenyl, nitrile silicon, fluorosilicon, and phenylene; the one component is divided into deacidification type, dealcoholization type, depurination type, deamination type, deamidation type, and deketone. Type and so on.
3. Silicone silicone oil can be divided into methyl silicone oil, ethyl silicone oil, methyl phenyl silicone oil, amino silicone oil, methyl hydrogen silicone oil, chlorophenyl silicone oil, fluorosilicone oil, nitrile silicone oil, long-chain alkane silicone oil, diffusion pump oil And modified silicone oil and so on. There is a type of processed product which is a large amount of silicone oil, that is, a silicone oil emulsion, such as a fabric treatment agent.
4. Silicone silicone resin can be divided into methyl silicone resin, methyl phenyl silicone resin, etc. according to the composition; solvent-based and solvent-free according to the form. Silicone resins are also made into coatings, molding powders and modified.
5. The silane coupling agent is classified according to a functional group, and the silane coupling agent mainly includes a vinyl silane, an amino silane, an epoxy silane, a mercapto silane, a methacryl oxy silane, and the like.
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