Фенилтрихлорсилан

Description

Phenyltrichlorosilane C6H5SiCl3 is a chlorosilane with one phenyl and three chlorine substituents at silicon. One of the key monomers of organosilicon synthesis: phenyl-containing silicone resins and oils are obtained from it by hydrolysis and subsequent polycondensation. Three hydrolyzable Si–Cl bonds make it a trifunctional unit, that is, a cross-linking unit in the polymer network.

Identification

• CAS No.: 98-13-5
• Chemical formula: C6H5Cl3Si
• Molecular weight: 211.541; exact weight: 211.55
• EU number: 202-640-8
• UNII: M7199JL06M
• NSC number: 77080
• UN number: 1804
• DSSTox ID: DTXSID5026621
• HS code: 2931900090
• PSA: 0
• XLogP3: 5.94

Physical properties

• Color and form: colorless liquid
• Appearance: colorless liquid with a pungent odor; under the influence of moisture or water, it decomposes to hydrochloric acid with the release of heat; causes metal corrosion and tissue damage
• Density: 1.321 g/cm³ at 25 °C
• Melting point: −33 °C
• Boiling point: 201 °C
• Flash point: 196°F (91°C), open cup
• Refractive index: 1.536
• Solubility in water: reacts. Soluble in benzene, ether, perchlorethylene

Chemical behavior

The defining property is hydrolytic instability. Si–Cl bonds are destroyed by air moisture, releasing hydrogen chloride and heat; The hydrolysis product is phenylsilanols, which immediately condense into siloxane structures. From here there are two practical consequences: any work is carried out in a dry atmosphere, and product vapors in the workshop produce an acidic fog that is aggressive to the metal and the respiratory tract.

Scope of application

• raw material for phenyl silicone oils and resins: phenyl groups increase the heat resistance and radiation resistance of the polymer compared to purely methyl silicones
• intermediate product for the production of polysiloxanes
• hydrophobizers and water-repellent impregnations
• electrical insulating resins and heat-resistant paints and varnishes
• sizing agents and surface modifiers, sizing of fillers
• laboratory reagent for organosilicon synthesis

Safety Information and Transport

• UN number: 1804
• Primary hazard: corrosive to skin, eyes, respiratory tract and metals; upon contact with water, hydrogen chloride is released when heated

The product card does not contain phrases H and P, toxicity indicators and WGK class - this data is taken from the manufacturer's safety data sheet.

Storage and handling

The entry about storage conditions in the original card is torn off at the listing “all containers, pipes, apparatus, installations and structures used for production, storage, transportation.” The meaning of the requirement is standard for chlorosilanes: the entire system must be sealed and drained. The product is stored under dry inert gas, the container is protected from moisture, and corrosion-resistant materials are used. Work - in a fume hood, wearing gloves, glasses and protective clothing; in the event of a spill, it cannot be extinguished or diluted with water, since hydrolysis occurs with the release of hydrogen chloride and heat.