Silicone intermediates are mainly Dimethylcyclosiloxane (DMC), Hexamethyldisiloxane (MM), Hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), DecaMethylCycloPentaSiloxane (D5) and other siloxane products. The following will take you to understand the introduction of these silicone monomers And the association in the application.
D3 is Hexamethylcyclotrisiloxane, white crystal, melting point 75℃, shrinkage rate 0.6-0.8%, used for shrinkage treatment of silicone rubber. In addition to the synthesis of general organosilicon polymers, D3 can also be used to prepare specific organosilicon compounds as various surface treatment agents, coupling agents, crosslinking agents, etc.
D3 molecular structure
D4 is octamethylcyclotetrasiloxane. It is a pure substance, colorless, transparent or milky white liquid, flammable and odorless. It is a compound obtained by separation and rectification on the basis of dimethyldichlorosilane through the hydrolysis synthesis process. , Is an important intermediate in the silicone industry. The main uses include the preparation of silicone polymers such as methyl silicone oil, the insulation and moisture-proof of radio parts, and the surface deactivator for gas chromatography glass capillary columns.
D4 molecular structure
D5 is decaMethylCycloPentaSiloxane, a colorless and odorless organosilicon compound, widely used in cosmetics and body care products, and has good compatibility with most alcohols and other cosmetic solvents.
D5 molecular structure
DMC is Dimethylcyclosiloxane, which is a mixture of D3, D4 and D5. It is composed of wire and ring. It can be used to polymerize silicone oil (polysiloxane). It is a colorless and transparent oily liquid, flammable, with a density range of 0.95-0.97g/ cm3.
DMC is divided into hydrolysis material and cracking material according to the source of raw materials. Cracking DMC is silicone waste after sorting to remove iron, crushed into high temperature reactor for acid cracking process, and then use alkali cracking process to make solid silicone cracked into small molecules Dimethylcyclosiloxane, and then vacuum distillation is purified to obtain DMC.
DMC molecular structure
DMC is the main raw material for the production of silicone rubber and silicone oil. It is also widely used in rubber filler treatment and cosmetics. Dimethylcyclosiloxane (DMC) is used to prepare silicone rubber, silicone oil and other polysiloxane products, which can be further processed into improved silicone rubber and silicone oil with high and low temperature resistance, insulation, weather resistance, ozone resistance, and radiation resistance.
The above is a brief introduction to silicone intermediates DMC, D3, D4, D5 raw materials.
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