In response to market demand for higher hydrophobic performance of base materials, we have newly launched the Octadecyltrimethoxysilane product series. As a long-chain alkane-based silane coupling agent, it not only delivers outstanding hydrophobicity and interfacial activity, but also significantly reduces material surface tension, improving the convenience of coating, adhesion and lubrication. Featuring UV resistance, high-low temperature resistance and superior chemical stability, it maintains stable performance under various harsh environments. Its unique hydrophilic-lipophilic balance structure and surface activity enable uniform dispersion in both aqueous and oil phases, forming stable emulsions and dispersions at diverse interfaces to expand application possibilities.

Basic Information

Chinese Name:十八烷基三甲氧基硅烷

English Name: Octadecyltrimethoxysilane

Common Abbreviation: OTS / ODTMOS

Chemical Formula: C₂₁H₄₆O₃Si

CAS No.: 3069-42-9

Structural Formula: CH₃(CH₂)₁₇Si(OCH₃)₃

Core Properties & Mechanism

The core function of Octadecyltrimethoxysilane is to form a durable, hydrophobic protective film on the surface of inorganic materials. Its working principle is as follows:

1. Hydrolysis: Methoxy groups in silane molecules are hydrolyzed into reactive  silicone hydroxyl groups when exposed to moisture in the air or water films on material surfaces.

2. Bonding: Bonding with substrates. The generated silicone hydroxyl groups undergo dehydration-condensation with hydroxyl groups on inorganic materials (such as glass, concrete, metal oxides), forming firm Si-O-Si or Si-O-M (M = metal) covalent bonds.

3. Self-crosslinking: Silicone hydroxyl groups between silane molecules also condense with one another, forming a cross-linked siloxane network structure on the material surface.

Application Scenarios

· Building Protection: Added to exterior wall coatings to enhance surface smoothness and antifouling performance, block water penetration and extend building service life.

· Rubber & Plastic Components: Improve the anti-aging and wear-resistant properties of rubber seals and plastic products, enhance surface smoothness and weather resistance, and prolong product service life.

· Functional Textile Finishing: Endow textiles with water-proof, oil-proof and antifouling properties to boost their functionality and comfort.

· Cultural Relic Protection: Resist acid corrosion and freeze-thaw damage, applied to surface reinforcement and weathering protection of stone and ceramic cultural relics.

· High-End Industrial Applications: Suitable for multiple high-end fields including anti-fog treatment for glass, surface modification of ultrafine powders (e.g. stationary-phase surface treatment for chromatographic columns or separation materials).

Product Portfolio

We also provide methoxysilane and chlorosilane products with various carbon-chain lengths to meet diverse hydrophobic requirements for different scenarios.

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