Introduction of silicone-Iota

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Service > Introduction of silicone

Introduction of silicone

Organosilicon compounds are those containing Si-O bond, and at least one organic group is a compound directly bonded to silicon atoms, the compounds often customary to those obtained by an oxygen, sulfur, nitrogen and other organic groups connected to the silicon atom also as an organic silicon compound. Among them, the silicon-oxygen bond (-Si-0-Si-) as a skeleton composed of silicone, is the largest number of organic silicon compounds, study the deepest, the most widely used class of more than 90% of the total amount of .
The nation's largest organic silicon industry sites, there are all kinds of detailed documentation, reference documents on silicone hotline website.
Silicone material having a unique structure:
(1) on the Si atoms in a high energy sufficient methyl polysiloxane backbone shielding;
(2) CH polarity, so that the interaction is very weak intermolecular forces;
(3) Si-O bond length is longer, Si-O-Si bond angle is large.
Covalent bond (4) Si-O bond is an ionic bond with a 50% characterized by (a covalent bond with a directional, non-directional ionic bond).
Due to the unique structure of organic silicon, both the performance of inorganic materials and organic materials with low surface tension, viscosity-temperature coefficient, high compression, gas permeability higher basic properties, and has high temperature resistance, electrical insulation, resistance to oxidation stability resistance, weather resistance, flame retardant, water-repellent, corrosion-resistant, non-toxic, odorless and physiologically inert and other outstanding features, widely used in aerospace, electrical and electronics, construction, transport, chemicals, textiles, food, light industry, medical and other industries, where the silicone is mainly used in sealing, bonding, lubrication, coating, surface activity, stripping, defoaming, waterproof, moisture, inert fillers and the like. With the continued growth in the number and variety of organic silicon, applications continue to expand, the formation of new chemical materials sector important unique product system, many varieties can not be replaced by other chemicals, but essential.
Silicone materials according to their different forms, can be divided into: a silane coupling agent (silicone chemical reagents), silicone oil (grease, silicone emulsions, silicone surfactant), high-temperature vulcanized silicone rubber, liquid silicone rubber, silicone, composites and the like.
First, the performance of silicone
The basic structural unit of the silicone product is made of a silicon - oxide chain section composed of the side chain attached to the silicon atom through a variety of other organic groups. Thus, in the structure of organic silicon products containing both "organic group", also contain "inorganic structure", this particular composition and molecular structure makes it characteristic feature set and inorganic organic matter in one. Compared with other polymer materials, the most outstanding performance silicone products are:
1. Temperature characteristics
Silicone products based on silicon - oxygen (Si-O) bond as the main chain structure, C-C bond energy of 82.6 kcal / mole, Si-O bond in the organic Si bond energy of 121 kcal in / mole, so the high thermal stability of silicone products, at high temperature (or radiation) molecular bond is not broken, do not break down. Silicone not only temperature, but also low temperature, can be used in a wide temperature range. Whether it is physical or chemical properties and mechanical properties, changes in temperature are very small.
2. Weatherability
Backbone of silicone products for -Si-O-, unparalleled key exists, it is not easy to be decomposed by UV and ozone. Silicone has a better than other polymer materials, thermal stability and resistance to radiation and weathering capabilities. Silicone natural environment life of up to several decades.
3. Electrical insulation properties
Silicone products have good electrical insulation properties, dielectric loss, resistance, voltage, resistance, arc resistance, corona, volume resistivity and surface resistivity of the top in the insulating material etc., and their electrical properties affected by temperature and frequency little effect. Therefore, they are in a stable electrically insulating material, are widely used in electronic and electrical industry. Silicone addition has excellent heat resistance, but also has excellent water repellency, the electrical equipment which is used under wet conditions with a high guarantee of reliability.
4. Physiologically inert
The polysiloxane compound is known to the least one active compound. They are very resistant to biological aging, and animal body without rejection, and has better anti-clotting properties.
5. Low surface tension and low surface energy
Main chain of the silicone is very soft, the force between molecules is much weaker than the hydrocarbon, therefore, less than the viscosity of the hydrocarbons with a molecular weight, surface tension is weak, the surface energy is small, the film forming ability. This low surface tension and low surface energy is the main reason for many applications it gets: the excellent performance of hydrophobic, anti-foaming, foam stabilizers, anti-sticking, lubrication, polishing and so on.
Second, use of silicone
Since the organic silicon has these excellent properties, it is a very wide range of applications. It is not only as aviation, cutting-edge technology, military technology department of special materials, but also for the various sectors of the national economy, its scope of application has been extended to: construction, electrical and electronics, textile, automobile, machinery, leather, paper, chemicals, light industry, metal and paint, pharmaceutical and medical.
Third, the classification of silicone
Silicones are divided into silicone rubber, silicone, silicone three categories.

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