3-Chloropropyltriethoxysilane

3-Chloropropyltriethoxysilane is an organic-inorganic compound with the chemical formula C₉H₂₁ClO₃Si and CAS number 5089-70-3. It appears as a colorless, transparent liquid at room temperature. The compound has a density of approximately 1.0±0.1 g/cm³, a boiling point of 230.8±23.0°C, and a flash point of 78.8±14.7°C. It is insoluble in water but readily undergoes hydrolysis in the presence of moisture to form condensation products. The chlorine atom in its molecular structure exhibits high reactivity and can be substituted by functional groups such as hydroxyl, amino, or carboxyl groups. It can also participate in coupling reactions.

Primarily used as a silane coupling agent, 3-chloropropyltriethoxysilane is widely applied in the preparation of epoxy resin composites, reactive silicone oils, and silicone rubbers. Additionally, it serves as an intermediate in organic synthesis and finds applications in rubber auxiliaries, coatings, and surface treatment agents. Industrially, it is produced via alcoholysis reaction between 3-chloropropyltrichlorosilane and ethanol.

Product Information:

●  Name: 3-Chloropropyltriethoxysilane

● Synonyms: Chloropropyltriethoxysilane; γ-Chloropropyltriethoxysilane; 3-(Triethoxysilyl)propyl chloride; 3-Chloropropyltriethoxysilane

● CAS No.: 5089-70-3

● Molecular Formula: C₉H₂₁ClO₃Si

● Molecular Weight: 240.8

● Structural Formula:

Physical Properties:

● Density (25°C): 1.0090 ± 0.0050 g/cm³

● Boiling Point: 220°C

● Flash Point: 72°C

● Refractive Index (n²⁰/D): 1.418 (lit.)

● Appearance: Colorless transparent liquid

● Solubility: Hydrolyzes upon contact with water; soluble in low-molecular-weight alcohols, hydrocarbons, ethers, and similar solvents

Applications:

Also known as γ-chloropropyltriethoxysilane, 3-chloropropyltriethoxysilane is primarily used in the market as an affinity coupling agent and adhesion promoter. Coupling agents enhance the interfacial interaction between inorganic and organic materials, significantly improving the overall performance of composite materials—such as mechanical, thermal, electrical, and optical properties. As a novel coupling agent for plastics and rubber, it improves the abrasion resistance and aging resistance of products including tires, rubber sheets, hoses, and footwear. Moreover, it helps reduce the consumption of natural rubber, thereby lowering production costs.

Storage:

Store in a dry, cool, and light-protected indoor environment.

Packaging:

Plastic drums, net weight: 25 kg and 200 kg.

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