Hexamethyldisiloxane (silicone, MM capping agent), colorless and transparent liquid, easy to deliquesce. Insoluble in water, soluble in many organic solvents. Used as silicone oil, silicone rubber, pharmaceuticals, gas chromatographic fixatives, analytical reagents, hydrophobic agents, etc. Produced by hydrolysis of trimethylchlorosilane.
Properties: colorless transparent liquid, easy to deliquesce.- Solubility: insoluble in water, soluble in most organic solvents;
Stability: stable;
Hazard marking: F Flammable substances - Technical indicators:
Density: 0.762-0.770g / ml
Refractive index: 1.3748
Melting point: -59 ℃
Boiling point: 99.5 ℃
Flash point: -1 ℃ - Dangerous characteristics: It is easy to cause burning in case of high heat, open flame and strong oxidant.
Combustion (decomposition) products: carbon monoxide, carbon dioxide, silicon oxide.
resolve resolution:
62.49g (0.575mol) trimethylchlorosilane was added dropwise to a solution composed of 72.7g (0.06mol) N, N-dimethylaniline and 7g water, and heated to reflux for 1h. Atmospheric distillation, collecting 98-101 ℃ fractions, after drying it is hexamethyldisilyl ether, to obtain 43-44g, yield 92-94%. Industrial production is the hydrolysis of trimethylchlorosilane at 30-40 ° C.
Used as silicone oil, silicone rubber, pharmaceuticals, gas chromatographic fixed liquids, analytical reagents, hydrophobic agents, etc. This product is used as a head sealing agent, cleaning agent, and stripping agent. It is mainly used in the production of organic chemicals and pharmaceutical chemicals.
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