Oct 09, 2021
1. Silicone—a new material with increasing permeability

Organosilicon generally refers to chemical molecular materials with carbonyl groups connected to the four bonds of silicon atoms. There are various organic groups on the silicon atoms, including methyl, ethyl, alkoxy, phenyl, etc., but currently the most important application It is [Si-O-Si-O]n as the main chain, and the other two groups on the silicon atom are methyl cyclosiloxane (DMC), and the downstream accounted for more than 90%. It is also what we call organosilicon monomers daily.|

The synthesis of organosilicon requires the synthesis of silicon powder and methyl chloride. About 0.25 tons of silicon powder and 0.8 tons of methyl chloride can be used to synthesize 1 ton of crude monomers, including monomethylchlorosilane, dimethylchlorosilane, trimethylchlorosilane, and high boilers. , Low boilers, hydrogen-containing silanes, etc., among which dimethylchlorosilane is used as a monomer for the synthesis of DMC, and the yield can be increased to more than 85% through repeated disproportionation of methylene dimethyl. Dimethyl is hydrolyzed, cracked and rectified to produce polysiloxane DMC (D4 is a type of DMC), and the general industry is calculated based on the synthesis of 0.5 ton of DMC from 1 ton of crude monomer.

1.1. Electrical insulation, high and low temperature resistance, heterogeneous high adhesion, and water resistance are the four excellent properties of silicone
The special chemical bond of organosilicon brings excellent performance. Silicone is a polymer in which the [-Si-O-]n group is the framework, and the remaining two bonds of the silicon atom are connected to two methyl groups. Due to the chemical bond energy properties of the Si-C bond and the Si-O bond, the silicone has Quite a lot of excellent properties, such as better electrical insulation performance, better temperature tolerance, that is, it can withstand the extreme temperature of -50 degrees Celsius to 300 degrees Celsius without aging. Because the groups on both sides have different affinity for organic and inorganic media, and respectively affinity for organic and inorganic media, organic silicon can bond organic and inorganic media very well. At the same time, due to the properties of silicon atoms, silicone has very good water resistance and can be used for various waterproof seals.

The excellent performance has brought a wide range of applications, and the traditional demand is dominated by silicone rubber. Silicone is generally made into silicone rubber made by the polymerization of silicon-oxygen bonds. Due to the excellent properties of silicone, silicone products have been widely used as a high-performance material, and have been called "industrial monosodium glutamate" and "industrial vitamins". "Industrial catalyst" shows the continuous improvement of its status. For example, due to the excellent ability of silicone to bond "organic and inorganic media" and the ability to not age under extreme temperatures, silicone rubber has a wide range of applications as a binder for glass curtain walls. Due to the good sealing effect, silicone rubber sealing materials are widely used in automotive electronic device packaging, waterproof packaging required in building decoration, etc. Due to its anti-electricity effect, the insulating material required for power equipment is also an important use of organic silicon. In general, the domestic downstream demand for organic silicon is still dominated by silicone rubber. In 2018, the domestic downstream demand accounted for about 66.9%. In addition to silicone rubber, silicone is also mainly used in downstream demand areas such as textiles, daily chemical silicone oil, silicone resin, and silane coupling agent.

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