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Organic silicone household items

2018-07-24
Organic silicone

An organosilicon compound refers to a compound containing a Si-C bond and at least one organic group is directly bonded to a silicon atom, and a compound which connects an organic group to a silicon atom through oxygen, sulfur, nitrogen or the like is also conventionally used. Also used as an organosilicon compound. Among them, polysiloxanes composed of silicon-oxygen bonds (-Si-O-Si-) are the most widely studied and most widely used organosilicon compounds, accounting for more than 90% of the total dosage.
Chinese name Organic silica gel According to the form of silane coupling agent According to the vulcanization method Silicone rubber can be divided into high temperature vulcanized organic silicon unique structure bond Si-C bond
table of Contents
1 structure
2 Form classification
3 performance
4 Use of silicone
5 Classification of silicones
6 inorganic silica gel
▪ Introduction
▪ Product characteristics
▪ Use
7 Development prospects

structure
Silicone materials have a unique structure:
(1) A sufficient methyl group on the Si atom shields the high energy polysiloxane backbone;
(2) C-H is non-polar, making the intermolecular interaction force very weak;
(3) The Si-O bond has a long length and a large Si-O-Si bond angle;
(4) Si-O bond is a covalent bond with 50% ionic bond characteristics (covalent bond has directionality, ionic bond has no direction)

Morphological classification
Can be divided into: (silicone chemical reagents), silicone oil (silicone grease, silicon emulsion, silicon surfactant), high temperature vulcanized silicone rubber, liquid silicone rubber, silicone, composites and so on.
(Hot vulcanized) silicone rubber and room temperature vulcanization (including low temperature vulcanization) silicone rubber two major categories.
Due to its properties with organic materials, it has basic properties such as low surface tension, low viscosity coefficient, high compressibility and high gas permeability. It has high and low temperature resistance, electrical insulation, oxidation resistance, weather resistance, flame retardancy and water repellency. Excellent resistance to corrosion, non-toxic, tasteless and physiologically inert. It is widely used in aerospace, electrical and electronic, construction, transportation, chemical, textile, food, light industry, medical and other industries. Silicone is mainly used for sealing and bonding. Lubrication, coating, surface activity, demoulding, defoaming, foam suppression, waterproof, moisture proof, inert filling, etc. With the continuous growth of the number and variety of organic silicon, the application field has been continuously expanded to form an important product system unique to the chemical new materials industry. Many varieties are indispensable and indispensable for other chemicals.

performance
The basic structural unit of the organosilicone product is composed of silicon-oxygen chain links, and the side chains are connected to various other organic groups through silicon atoms. Therefore, in the structure of the silicone product, both the "organic group" and the "inorganic structure" are contained, and this special composition and molecular structure make it combine the characteristics of the organic substance with the function of the inorganic substance. Compared with other polymer materials, the most outstanding properties of silicone products are:
1. Temperature resistance
The silicone product is based on a silicon-oxygen (Si-O) bond. The bond energy of the C-C bond is 82.6 kcal/g molecule, and the bond energy of the Si-O bond is 121 kcal in the silicone. /moles, so silicone products have high thermal stability, and the chemical bonds of molecules at high temperatures (or radiation) do not break or decompose. 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 chemical or physical and mechanical properties, it varies little with temperature.
2. Weather resistance
The main chain of silicone products is -Si-O-, which has no double bonds and is therefore not easily decomposed 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.
3. Electrical insulation performance
Silicone products have good electrical insulation properties, and their dielectric loss, withstand voltage, 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 small. Therefore, they are a stable electrical insulating 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 in the use of electrical equipment under wet conditions.
4. Physiological inertia
Polysiloxanes are one of the most inactive compounds known. They are very resistant to biological aging, have no rejection reaction with animals, and have good anticoagulant properties.
5. Low surface tension and low surface energy
The main chain of silicone is very compliant, and its intermolecular force is much weaker than that of hydrocarbons. Therefore, it is lower in viscosity than hydrocarbons of the same molecular weight, has weak surface tension, small surface energy, and strong film forming ability. This low surface tension and low surface energy are the main reasons for its multi-faceted application: hydrophobic, defoaming, foam stabilization, anti-sticking, lubrication, glazing and other excellent properties.
Use of silicone
Since silicone has these excellent properties, it has a wide range of applications. It can be used not only as a special material for aviation, cutting-edge technology, and military technology departments, but also for various sectors of the national economy. Its application has been extended to: construction, electrical and electronic, textile, automotive, machinery, leather and paper, chemical light industry. , metals and paints, medical and medical industries.

Classification of silicone
Silicone is mainly divided into three categories: silicone rubber, silicone resin and silicone oil.
● High temperature vulcanized silicone rubber (HTV)
● Room temperature vulcanized silicone rubber (RTV)

Introduction to Inorganic Silicone
Inorganic silica gel chemical formula xSio2·yH2O. A transparent or milky white granular solid, a highly active adsorbent material, usually an amorphous machine made by reacting sodium silicate with sulfuric acid and undergoing a series of post-treatment processes such as aging and acid foaming. It is washed or processed by minerals in nature to become granules or beads. The main component of inorganic silica gel is silica, which is an amorphous machine made of sodium silicate and sulfuric acid in silica. Finished product. The inorganic silica gel is washed or processed by minerals existing in nature to become granular or beaded.

Product Features
The structure of the inorganic silica gel is very similar to a sponge. The pores that communicate with each other form a capillary pore adsorption system with a large surface area, which can adsorb and retain water vapor. At a humidity of 100%, it can adsorb and condense moisture equivalent to 40% of its own weight. High adsorption performance, capable of adsorbing a variety of substances. Dilute sulfuric acid (or hydrochloric acid) is added to an aqueous solution of water glass and allowed to stand to form a hydrous silicic acid gel, which is solidified, has good thermal stability, is chemically stable, and has high mechanical strength. use
Inorganic silica gel has a wide selection of packaging materials, generally OPP/PE, PET/PE film, non-woven fabric, composite paper and so on. Used for gas drying, gas absorption, liquid dehydration, chromatography, etc., also used as a catalyst. For example, cobalt chloride is added, which is blue when dried and red when absorbed.

Prospects
Several foreign silicone companies have made every effort to rationalize production, and strive to reduce costs. In production, the key factors affecting product quality and cost are seized to enhance competitiveness, such as: continuously expanding the scale of single-cylinder bed of methylchlorosilane; Continuously increase the content of dimethyldichlorosilane in methylchlorosilane; establish a fumed silica production plant used as a silicone rubber near the methylchlorosilane production plant to comprehensively utilize by-products in the production of methylchlorosilane It pays great attention to the cost of supporting transportation and logistics in the production process, and achieves the most rational layout and the most economical scale production. In recent years, some production enterprises in China have made efforts in this regard and achieved gratifying results. However, many enterprises are still in a blind state. Blindly expanding production scale or repetitive technology introduction according to market needs, lacking technical and economic arguments, resulting in economic benefits decline or loss.
 
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