Silicon industry chain, have you understood the origin of silicone products?silicone baby cup price

　　Silicon is an important petrochemical substitute material, energy material and electronic material. The crustal abundance of silicon is 27%, second only to oxygen (46%), and about 1,000 times that of carbon. It is extremely rich in resources and has huge development potential. For a long time, the development and utilization of silicon materials have been the focus of the industry and the whole society. How silicon is transformed from its initial form into different types of downstream products is illustrated in the following figure.

　　Silicon metal

　　Metal silicon, also known as industrial silicon or crystalline silicon, is usually produced by reducing carbon dioxide in an electric furnace. Its main use is as an additive for non-ferrous alloys and as a starting material for the production of semiconductor silicon and organic silica gel. Major domestic silicon metal enterprises such as Hesheng Silicon Industry, Hubei Sanxin Silicon Industry, Siziwangqi Jiahui Silicon Industry, Yunnan Yongchang Silicon Industry, Tianfu Silicon Industry, Jingxin Silicon Industry, etc. Since the production of metal silicon requires a lot of energy, the energy cost accounts for more than 50% of the total cost. Therefore, Chinese silicon metal enterprises are more concentrated in the southwest region with abundant hydropower resources, or in the northwest and northeast regions with low-cost power resources.

　　Poly(mono)crystalline silicon

　　Polysilicon is a form of elemental silicon, which is used in the electronics industry to manufacture basic materials such as semiconductor radios, tape recorders, color TVs, video recorders, and electronic computers. In the new energy industry, polysilicon is an important raw material for the production of solar cells, and the general purity is 6-9N. China is the world's largest producer of polysilicon, and the main companies include Jiangsu Zhongneng Silicon Industry, Jiangxi LDK, TBEA, Luoyang Zhongsil and so on.

　　Monocrystalline silicon refers to a single crystal of silicon, which is drawn from high-purity polycrystalline silicon in a single crystal furnace. A crystal with a substantially complete lattice structure. Different directions have different properties and are a good semiconducting material. The general purity requirement is 9-12N. Used in the manufacture of semiconductor devices, solar cells, etc.

　　Microsilica

　　Microsilica is an amorphous (non-crystalline) polymorph of silicon dioxide. Generally speaking, 0.3-0.5 tons of silicon micropowder can be by-produced for every ton of silicon metal produced. Microsilica is sometimes confused with fumed silica. The average particle size of silica micropowder is 150 nanometers, which is 100 times smaller than cement particles, and the specific surface area is 15~30 square meters per gram, while the primary particle size of fumed silica is only about 5~7 nanometers, and the specific surface area is as high as 150~300 m²/g. The main application field of microsilica is as a reinforcing filler for high-performance concrete, especially to improve its comprehensive strength, bond strength and wear resistance. The addition of microsilica can also reduce the permeability of chloride ions to concrete and prevent the steel bars in the concrete from being corroded. In addition, silicon micropowder is also widely used in the fields of ceramics and refractory materials.

　　Silica sol

　　Silica sol is a dispersion of nano-sized silica particles in water or solvent. Since the SiO2 in the silica sol contains a large amount of water and hydroxyl groups, the silica sol can also be expressed as SiO2.nH2O. It can be used as binder for various refractories, coating industry, precision casting of thin shells, catalyst manufacturing and catalyst carrier, cellophane anti-adhesion agent, pretreatment agent for photographic paper, anti-slip agent for cement bags, dispersant for picture tubes, anti-corrosion agent for floor wax Slip and so on.

　　Monosilane

　　Monosilane is a colorless gas, alias tetrahydrosilicon, monosilane, which can spontaneously ignite in contact with air and release a very thick white amorphous silica fumes. Monosilane can be divided into industrial grade and electronic grade according to purity. Electronic grade is mainly used in integrated circuits, flat-screen TVs, solar cells and other industries; the main use of industrial grade is as the skeleton structure of chlorine monosilanes and alkyl chloride monosilanes. , Become the raw material of polysilicon, silicon oxide, silicon nitride, etc.

　　Silicone

　　Silicone resin is a polyorganosiloxane with a highly cross-linked network structure, which has the dual characteristics of organic resin and inorganic material, and has unique physical and chemical properties. Silicone resin is mainly used as insulating paint (including varnish, enamel, paint, impregnating paint, etc.) to impregnate H-class motor and transformer coils, and used to impregnate glass cloth, glass cloth and asbestos cloth to make motor bushings and electrical insulation. winding, etc. In addition, silicone resin can also be used as heat-resistant and weather-resistant anti-corrosion coatings, metal protective coatings, construction waterproof and moisture-proof coatings, mold release agents, adhesives and secondary processing into silicone plastics for electronic, electrical and defense industries In the past, as semiconductor packaging materials and electronic and electrical silicone resins, it can be roughly divided into several categories such as silicone insulating paints, silicone coatings, silicone plastics and silicone adhesives according to their main uses and cross-linking methods. Silicone resin processing additives have unique flexibility and compatibility, and have become a key ingredient in pulp and tissue production.

　　Silicone Rubber

　　Silicone rubber is a unique synthetic elastomer made from a polymer cross-linked by oxygen and silicon. It has the perfect balance of mechanical and chemical properties to meet many of today's demanding applications. Silicone rubber is a large category of silicone products with the largest output and the most widely used silicone products. 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 type liquid silicone rubber products (LSR).

　　High temperature silicone rubber, alias mixing silicone rubber, solid silicone rubber. It is one of the most mature products in silicone rubber. Because of its good high and low temperature resistance, weather resistance, hydrophobicity, arc resistance, electrical insulation, physiological inertia, etc., it is widely used in national defense industry, medical and health, industrial and agricultural production and people. widely used in daily life.

　　The development of high-temperature silicone rubber in China is relatively mature. In 2016, the production capacity reached 539,000 tons/year, and the output reached 440,000 tons. Liquid silicone rubber, namely addition type two-component liquid silicone rubber (LSR), is a category of varieties with rapid development, high technical content and high added value in recent years. In 2016, my country's LSR production capacity reached 59,100 tons, with an output of about 35,000 tons, mainly used in maternity and baby products, medical care, electronics.

　　RTV silicone rubber generally has a low molecular weight (30,000 to 60,000). RTV silicone rubber has one or two functional groups at both ends of the molecular chain (sometimes in the middle), and under certain conditions (moisture in the air or appropriate catalyst), these functional groups can react to form high molecular weight. cross-linked structure. The main production enterprises are Guangdong Baiyun, Chengdu Sibao, Guangzhou Xinzhan, Hangzhou Zhijiang, Zhengzhou Zhongyuan and so on.

　　Silicone Oil/Emulsion

　　Silicone oil is a kind of linear silicone polymer with Si-O-Si as the main chain and organic groups in the side chain. Widely used in textile, daily chemical, machining, chemical, electrical and electronic, medical and health industries. Usually silicone oils remain liquid at room temperature. As the molecular weight increases, the viscosity also increases, so the viscosity is an important physical property index of silicone oil. At present, common commercial silicone oils include methyl silicone oil, vinyl silicone oil, phenyl silicone oil, methyl phenyl silicone oil, methyl hydrogen-containing silicone oil, polyether modified silicone oil, etc. The silicone oil that can be used directly as a product is usually called a one-time product, and the silicone oil is used as a raw material or auxiliary agent, and thickeners, surfactants, solvents, fillers and various performance improvers are added. , emulsion, solution and other products are called secondary processed products of silicone oil. The domestic companies that produce silicone oil mainly include Bluestar New Materials, Xin'an Chemical, Tianci, Biaomei, Yichang Kelin, etc. The companies that produce emulsions mainly include Transfar and Demei Chemical.

　　Functional Silane

　　Functional silanes, together with silicone rubber, silicone oil and silicone resin, are called four categories of silicone materials; structurally speaking, small organic silicon molecules with a main chain of -Si-O-C- structure are generally referred to as functional silanes, while the Small molecule intermediates and polymer macromolecules whose main chain is -Si-O-Si- structure are generally called siloxanes, namely silicone rubber, silicone oil and silicone resin products; from the functional point of view, functional silanes are mostly hybrid Most products contain both polar and non-polar functional groups in the same molecule, which can be used as an interface bridge between inorganic materials and organic materials or directly participate in the cross-linking reaction of organic polymeric materials, thereby greatly improving material properties. China has become the world's largest producer, exporter and consumer of functional silane. In 2016, the total effective production capacity was about 351,000 tons per year, the output was about 199,000 tons, and the consumption was 138,000 tons. The main production enterprises are Hubei Xinlantian, Jingzhou Jianghan, Jiangxi Hongbai, Nanjing Shuguang and so on.

　　Fumed silica

　　Widely used in various industries, mainly used as rubber reinforcing agent, plastic filler, ink thickener, metal soft polishing agent, insulating and insulating filler, decolorizing agent, matting agent, advanced daily cosmetic filler and spraying material, Medicine, environmental protection and other fields, and provide new material basis and technical guarantee for the development of related industrial fields. It has attracted great attention due to its specific functions compared with conventional materials in terms of magnetism, catalysis, light absorption, thermal resistance and melting point. In 2016, China's fumed silica production capacity was 125,800 tons, and the output reached 70,600 tons. The main domestic enterprises are Xin'an, Dongyue, Huifu and so on.

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