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Describe the functional characteristics and structural properties of silicone contained in silicone bag cages

Silicone cages, ie organosilicon compounds, which contain Si-C bonds And at least one organic group is a compound directly connected to a silicon atom, and a compound which connects an organic group and a silicon atom through oxygen, sulfur, nitrogen or the like is also conventionally used as an organosilicon compound. In the meantime, polysiloxanes having a silicon-oxygen bond (-Si-O-Si-) as a skeleton are a large number of organosilicon compounds, and are widely studied and widely used, accounting for more than 90% of the total amount.

Structure

Silicone data has a common structure:

(1) A sufficient amount of methyl groups on the Si atom will be a high-energy polysiloxane backbone Shielded;

(2) CH is non-polar, making the interaction between molecules very weak;

(3) Si-O bond length is longer, Si-O-Si bond The key angle is large.

(4) The Si-O bond is a covalent bond having a 50% ionic bond characteristic (covalent bond has directionality and ionic bond has no directionality).

Temperature resistance characteristics

Silicone products are based on silicon-oxygen (Si-O) bonds, and the bond energy of C-C bonds is 82.6 kcal/g. The bond of the molecule and the Si-O bond is 121 kcal/g in the silicone, so the thermal stability of the silicone product is high, and the chemical bond of the molecule at high temperature (or radiation) is not broken or differentiated. Silicone is not only resistant to high temperatures, but also resistant to low temperatures and can be used over a wide temperature range. Whether it is a chemical function or a physical mechanical function, it changes little with temperature.

Weatherability

The main chain of silicone products is -Si-O-, which has no double bonds and is therefore not easily differentiated by ultraviolet light and ozone. Silicones have better thermal stability and resistance to radiation and weathering than other polymer materials. The service life of silicone in the natural environment can reach several decades.

Electrical Insulation Function

Silicone products have good electrical insulation, dielectric loss, withstand voltage, arc resistance, corona resistance, volume resistivity and surface resistivity. They are among the best in insulation materials, and their electrical functions are minimally affected by temperature and frequency. Therefore, they are a stable electrical insulation material and are widely used in the electronics and electrical industries. In addition to excellent heat resistance, silicone has excellent water repellency, which is a guarantee of high reliability of electrical equipment under wet conditions.

Biological Properties

Bioactive silicones are essential nutrients for the body. Silicone is an important element that constitutes human tissue and participates in innovation. Stored in every cell of the human body, as a support for cell construction, silicone bags together help other important substances such as magnesium, phosphorus, calcium and so on. The human body can only continuously obtain silicone through food.

Due to the common structure of organic silicon, it combines the functions of inorganic materials and organic materials, and has basic properties such as low surface tension, small viscosity coefficient, high compressibility and high gas permeability, and has high and low temperature resistance. Excellent electrical, electrical insulation, oxidation resistance, weather resistance, flame retardant, water-repellent, corrosion-resistant, non-toxic and tasteless, and physiological lazy, widely used in aerospace, electrical and electronic, construction, transportation, chemical, textile, food , light industry, medical and other occupations, during which silicone is mainly used for sealing, bonding, lubrication, coating, surface active, demoulding, defoaming, foam suppression, waterproof, moisture-proof, lazy filling. With the continuous growth of the number and variety of silicones, the field of application continues to expand, forming an important product system unique to the new chemical industry. Many types are indispensable for other chemicals.

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