Organosilicon refers to a compound in which the main chain of the molecule is composed of silicon-oxygen chain links, and the side chain is connected by silicon atoms and various other organic groups.
Therefore, the structure of organic silicon products contains both "organic groups" and "inorganic structures". This special composition and molecular structure make it integrate the characteristics of organic substances and the functions of inorganic substances, and it has high and low temperature resistance. , Weather resistance, electrical insulation, ozone resistance, water repellency, flame retardant, non-toxic, non-corrosive and physiological inertness and many other excellent properties, and some varieties also have oil resistance, solvent resistance, and radiation resistance. Compared with other polymer materials, the most outstanding properties of silicone products are excellent temperature resistance, dielectric properties, weather resistance, physiological inertia and low surface tension.
Silicone performance1. Temperature resistance
General polymer materials are mostly based on carbon-carbon bonds as the main chain structure, such as plastics, rubber, chemical fibers, etc., while silicone products are based on silicon-oxygen bonds as the main chain structure, and the bond energy of carbon-carbon bonds is 82.6 thousand. The bond energy of the silicon-oxygen bond in organic silicon is 121 kcal per gram per mole of calorie, so the thermal stability of silicone products is high, and the chemical bonds of molecules will not be broken or decomposed under high temperature (or radiation exposure). Silicone is not only resistant to high temperature, but also resistant to low temperature, and can be used in a wide temperature range. Whether it is chemical properties or physical mechanical properties, the change with temperature is very small, which is also related to the flexible helical structure of silicone molecules.
2. Weather resistance
The main chain of organic silicon products is Si-O, and there is no double bond, so it is not easy to be decomposed by ultraviolet light and ozone. In silicone products, the chain length of silicon-oxygen bonds is approximately one and a half times the chain length of carbon-carbon bonds. The longer chain length makes silicone have better thermal stability, radiation resistance and weather resistance than other polymer materials. The life span of organic silicon in the natural environment can reach several decades.
3. Electrical insulation performance
Silicone products have good electrical insulation properties. Their dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistivity and surface resistivity are among the best in insulating materials, and their electrical properties are affected by temperature and frequency. The impact is very small. Therefore, they are a kind of stable electrical insulating materials, which are widely used in the electronics and electrical industries. In addition to excellent heat resistance, silicone also has excellent water repellency, which is a guarantee for high reliability of electrical equipment used in wet conditions.
4. Physiological inertia
Polysiloxane compounds are one of the most inactive compounds known. They are very resistant to biological aging, have no rejection reaction with the animal body, and have good anticoagulant properties.
Uses of siliconeBecause silicone has these excellent properties, it has a wide range of applications. It is not only used as a special material for aviation, cutting-edge technology, and military technology departments, but also used in various sectors of the national economy. Its application range has been expanded to: construction, electronics and electrical, textiles, automobiles, machinery, leather and paper, chemical light industry, Metal and paint, medicine and medical treatment, etc.
â‘ Application of silicone oil and its derivatives
The main applications of silicone oil and its derivatives are release agents, shock absorption oils, dielectric oils, hydraulic oils, heat transfer oils, diffusion pump oils, defoamers, lubricants, hydrophobic agents, paint additives, polishing agents, cosmetics and Daily necessities additives, surfactants, particle and fiber treatment agents, silicone grease, flocculants.
â‘¡Application of silane coupling agent
Silane coupling agents are mainly used in paint, plastic and rubber processing, and adhesives.
â‘¢Application of silicone resin
The main applications of silicone resin are varnishes, insulating varnishes, molding compounds, protective coatings, packaging materials, bonding coatings, pressure-sensitive adhesives, laminating resins, release agents, adhesives, and masonry waterproofing agents.
â‘£ Application of silicone rubber
Silicone rubber is divided into room temperature vulcanized silicone rubber and high temperature vulcanized silicone rubber. The former is mainly used in: sealants, adhesives, conformal coatings, gaskets, foam rubber, molded parts, packaging materials, electrical insulation, glass assembly, medical implants, surgical aids, molding materials; the latter Mainly used in: pipes and hoses, strips, wire and cable insulation materials, surgical auxiliary materials, flame-retardant rubber parts, penetrating sealing materials, molded parts, embossing rollers, automobile ignition cables and spark plug covers, extrusion parts , Medical implants, laminates, conductive rubber, fiber coatings, foam rubber.
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