Hexamethylcyclotrisiloxane (D3)
| Chemical Name: | Hexamethylcyclotrisiloxane |
| Product Category: | Silicone Intermediate – Product |
| Structural Formula: |  |
| CAS No.: | 541-05-9 |
| EINECS: | 208-765-4 |
| Molecular Formula: | C6H18O3Si3 |
| Molecular Weight: | 222.46 |
Hexamethylcyclotrisiloxane Description
Hexamethylcyclotrisiloxane molecular formula C6H18O3Si3, is a white crystal, melting point 75 ℃, shrinkage rate of 0.6-0.8%, mainly used for silicone rubber shrinkage treatment.
Alias also known as: D3, hexamethylcyclotrisiloxane, hexamethylcyclotrisiloxane (D3), cyclotrimethylsiloxane, hexamethylcyclotrisiloxane.
D3 silicone intermediates are not only used to synthesize general silicone polymers, but also can be used to prepare specific silicone compounds, as a variety of surface treatment agents, coupling agents, cross-linking agents.
| Melting point | 50-64 °C(lit.) |
| Boiling point | 134 °C(lit.) |
| Density | 1.02 |
| Vapor Density | 1 (vs air) |
| Flash point | 95°F |
| Storage conditions | Flammables area |
| Water solubility | may decompose |
| Sensitivity | Moisture Sensitive Moisture Resistant Water Resistant |
| Stability | Stable, but moisture sensitive. Incompatible with strong oxidizing agents. |
| Properties | white crystal, melting point 75°C, shrinkage rate 0.6-0.8%, used for silicone rubber shrinkage treatment |
| Uses | In addition to synthesizing general organosilicon polymers, it can also be used to prepare specific organosilicon compounds as various surface treatment agents, coupling agents, cross-linking agents, etc. |
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Hexamethylcyclotrisiloxane: Guide
Hexamethylcyclotrisiloxane is used in the manufacture of methyl vinyl silicone rubber products and is also an important raw material for the synthesis of other polymer compounds.
In trace amounts of sodium silanolate, potassium silanolate or a small amount of concentrated sulfuric acid, hexamethylcyclotrisiloxane within the Si-O-Si bond breakage rearrangement, the generation of straight-chain polysiloxanes and cyclic siloxane mixture. This catalytic fracture rearrangement process has an equilibrium character, and macromolecular chain-breaking degradation occurs at the same time as the ring-opening polymerization of the ring body into a high molecular weight polymer. Reaction with excess sodium hydroxide methanol solution produces sodium dimethylsilanediol. It can be produced by high-temperature cracking of the hydrolyzed material of dimethyldichlorosilane with KOH. Dimethicones and silicone rubbers are usually prepared in the form of mixed cyclic bodies (containing hexamethylcyclotrisiloxane).
In trace amounts of sodium silanolate, potassium silanolate or a small amount of concentrated sulfuric acid, hexamethylcyclotrisiloxane within the Si-O-Si bond breakage rearrangement, the generation of straight-chain polysiloxanes and cyclic siloxane mixture. This catalytic fracture rearrangement process has an equilibrium character, and macromolecular chain-breaking degradation occurs at the same time as the ring-opening polymerization of the ring body into a high molecular weight polymer. Reaction with excess sodium hydroxide methanol solution produces sodium dimethylsilanediol. It can be produced by high-temperature cracking of the hydrolyzed material of dimethyldichlorosilane with KOH. Dimethicones and silicone rubbers are usually prepared in the form of mixed cyclic bodies (containing hexamethylcyclotrisiloxane).
