Dichlorodimethylsilane CAS 75-78-5 Si(CH₃)₂Cl₂

What is Dichlorodimethylsilane

Dimethyldichlorosilane (Molecular formula: Si(CH₃)₂Cl₂), is an organosilicon compound, which is a colorless and transparent liquid with pungent odor at room temperature. It is easy to react with water to form chain or ring silicone resin, CAS No. 75-78-5, density 1.07 g/cm³, boiling point 70℃, flash point -15.6℃, it is a flammable and explosive chemical.

It is produced by direct reaction between methyl chloride and silicon in the presence of copper catalyst. The reaction temperature is usually controlled at 300~400℃, and the dimethyldichlorosilane generated by the reaction is separated and purified by distillation. This method has the advantages of low cost and high yield, and is the main method for industrial production at present.As an important organosilicon compound, dimethyldichlorosilane has a wide range of applications and important industrial value.

Application of Dichlorodimethylsilane

1. Synthesis of Siloxanes: Dimethyldichlorosilanes are important monomers in the synthesis of silicone polymers such as silicone oils, silicone rubber and silicone resins. These polymers are used in a wide range of applications in aerospace, electronics and electrical appliances, construction and pharmaceuticals due to their excellent heat resistance, weatherability and electrical insulation properties.

2. Surface treatment agents: Dimethyldichlorosilanes are commonly used to prepare hydrophobic and antifouling coatings, which can improve the water and stain resistance of materials, and have important applications in the textile, glass and ceramic industries.

3. Cross-linking agent: In organic synthesis, dimethyldichlorosilane can be used as a cross-linking agent to modify polymers and resins, thus improving their mechanical properties and heat resistance.

4. Chemical intermediates: Dimethyldichlorosilane is also used as an intermediate for other organosilicon compounds, e.g. in the preparation of dimethylsilanols, methylsilanes and silane coupling agents.

Hazards of Dichlorodimethylsilane

1. Irritant and corrosive: Dichlorodimethylsilane is irritating and corrosive to the eyes and skin and may cause eye and skin damage on contact. Avoid direct contact and take appropriate personal protective measures such as gloves, goggles and protective clothing when using.

2. Toxicity: Dichlorodimethylsilane has a certain degree of toxicity and may cause health effects with prolonged or heavy exposure. Inhalation or ingestion of excessive amounts of Dichlorodimethylsilane may cause respiratory irritation, headache, dizziness, nausea and vomiting.

3. Fire Hazard: Dichlorodimethylsilane is capable of forming flammable vapors in air, which may cause a fire or explosion when exposed to open flames or high temperatures. It should be kept away from ignition sources and fire precautions should be taken during storage and use.

4. Environmental impact: The emission of Dichlorodimethylsilane may cause pollution of water bodies and the atmosphere, with potential risks to aquatic organisms and the environment. When handling and disposing of waste, regulations and guidelines need to be followed to minimize the impact on the environment.

In conclusion, the use of Dichlorodimethylsilane should be based on safe handling, following relevant safety guidelines and regulations, ensuring appropriate protective equipment and ventilation to minimize risks to human health and the environment.

The transportation and storage of Dichlorodimethylsilane requires the following precautions

1. Transportation: During transportation, relevant regulations and rules should be followed. Dichlorodimethylsilane is classified as a hazardous material and should be appropriately packaged and labeled, and compliance with international and domestic transportation regulations should be ensured.

2. Storage containers: Dichlorodimethylsilane should be stored in well-sealed containers to prevent contact with moisture and humidity in the air. Common materials for storage containers include glass, stainless steel or special plastics, etc. Make sure that the containers can withstand the corrosive properties of Dichlorodimethylsilane.

3. Storage conditions: Dichlorodimethylsilane should be stored in a dry, clean, well-ventilated place. It should be kept away from fire, heat and combustible materials and avoid direct sunlight. The temperature of the storage area should generally be kept at room or low temperature and prolonged contact with moisture, humidity and air should be avoided.

4. SAFETY MEASURES: Appropriate safety measures must be taken when handling and working with Dichlorodimethylsilane. Operators should wear personal protective equipment such as chemical protective glasses, protective gloves, protective clothing and respiratory protective equipment. Good ventilation should be maintained during operation and avoid inhalation of vapors or contact with skin.

5. Waste disposal: Waste Dichlorodimethylsilane should be disposed of in accordance with the relevant waste disposal regulations. In general, it should be handed over to a specialized waste disposal facility for disposal to ensure safety and environmental protection.

Please note that local regulations and guidelines should be followed at all times to ensure safe transportation and storage of Dichlorodimethylsilane.