Performance determines use
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The market of silicone resin is not single, but thousands of niche markets across many industries, disciplines and functions. The following is an example of the special application of silicone resin, which may be said to be an all-purpose material.
One of the first applications was during World War II, in 1943, silicone rubber gaskets were used on B-29 searchlights and superchargers. No other material can withstand such extreme temperatures. In the late 1940s, this major use spawned an industry. Industrial gaskets and sealants, together with some applications of high temperature rubber, have caused explosive growth in the market. It has rapidly expanded to the automotive, aerospace and professional markets. At this time, the hot vulcanized silicone rubber industry has been established.
Silicon defoamer was used in industry before 1947. Based on very low surface tension, they can quickly eliminate foam. By 50s, liquid silicone resin with foam suppression capability was used in polyurethane products with uniform pore structure.
In 1948, the first polysiloxane emulsion was developed and applied to modern tire mold based on silicon release agent. Polydimethylsilicone oil (PDMS) is a natural anti-sticking agent with similar function and release agent. At the same time, silicone oil automobile wax and furniture polishing oil have been widely used. In addition, for stone and textile fabrics, there will be a unique water repellency 3.
Room temperature vulcanized (RTV) silicone resin is the first silicone rubber product accepted by the general user market. Since it was introduced in 1960, it has been widely used. Silicone resin is considered to be superior to other sealants because of its extreme temperature tolerance and its ability to adhere to various matrix materials without primer. They can also be used in construction, glass assembly, medicine, aviation, aerospace, manufacturing, electrical, electronic products and automotive markets. Today, the biggest part of silicone consumption is in the use of materials industry.
Room temperature vulcanized (RTV) silicone sealants for filling are widely used in automotive fluidity sealing materials, which is attributed to their ability to withstand high temperatures in various states. Silicone resin is the only elastomer that can keep good flexibility under the freezing condition of -45 degree C, so it is also used in the refrigeration industry. This capability also enables silicone resin to be used in aerospace applications. As the only elastomer to remain flexible at low temperatures, the silicone resin on the lunar boots worn by astronauts was the first material to touch the moon in 1969. In addition to the flexibility of low temperature, the anti-ultraviolet ability of silicone resin determines its application in artificial satellites and spacecraft.
In the field of electronic encapsulating adhesive, such as some mobile phones, silicone gel has the functions of damp proof, dustproof and waterproof, and can also be used as an absorber for mechanical shock / shock, and also has electrical insulation performance. Their low modulus and high stress dissipation ability produce internal vibration damping, which determines their use. In addition to high corona resistance and resistance to high voltage ionization, silicone resin itself is a very good electrical and thermal insulation material. Therefore, silicone resin can be used in many high voltage electronic and electrical fields. Conductor insulation and cable terminals are also very typical applications of silicone rubber. In those areas, they can include more than 90% of the current standard size of organic cable material 3. Moreover, when the insulated conductor is ignited, the external thermal and electrical insulators will form ashes, thus maintaining the operation capacity of 2.
The thermal insulation of silicone resin can also upgrade the top of the section of the extremely hot platform to the wooden shelf counter. In addition, the characteristic data of silicone rubber can also be used in the field of heat conduction, such as the radiator of loudspeakers and laptops. Conductive parameters can be applied to touch screen, electromagnetic interference (EMI) and radio frequency interface devices. Other characteristic values can be described as flame retardancy.
For more than 40 years, all glass aquariums have been assembled and sealed by RTV silicone resin due to their long-term water resistance and excellent glass bonding performance. Another unique use of the newly produced RTV silicone resin is the permanent trouser leg seam.
PDMS has a high free volume, which leads to the special atomic spacing of silicone resin, so the polymer has a strong permeability to gases and liquids. Considerable unique medical applications resulting from these functions include:
Incompatible materials, such as pharmaceuticals, can be incorporated into silicone pressure sensitive adhesives (PSA) repair materials. Drugs are placed in a free space inside a silica gel matrix. The rate is controlled by the silica gel matrix (such as filler grade, type, additional additives and crosslinking density), and the drug is released at the designed rate. Drugs are slowly exuded from the silica gel matrix and then absorbed by the skin. Drug delivery systems are relatively new areas that can be applied to any range, from vitamins and nitroglycerin-like drugs to antibiotics.