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Octadecyltrimethoxysilane Liquid CAS 3069-42-9

CAS No.:3069-42-9
Purity:99%
Place of Origin:Henan China
MF:C21H46O3Si
Appearance:Colorless liquid
Certification:MSDS,COA,TDS
Free Samples

CATEGORY

Octadecyltrimethoxysilane, as a long-chain alkane silane coupling agent, not only possesses excellent hydrophobicity and interfacial activity, but also significantly reduces the surface tension of materials, improving the ease of application, bonding, and lubrication. This product is UV resistant, withstands high and low temperatures, and exhibits strong chemical stability, maintaining stable performance even in various harsh environments. Its unique hydrophilic-lipophilic balanced structure and surface activity allow it to be uniformly distributed in both aqueous and oil phases, forming stable emulsions and dispersions at different interfaces, expanding its application possibilities.

Product picture:

Main characteristics and principles

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

1) Hydrolysis: When the methoxy group in the silane molecule encounters moisture in the air or a water film on the material surface, it hydrolyzes to generate reactive silanol groups.

2) Bonding: The generated silanol groups bond with the substrate, undergoing dehydration condensation with the hydroxyl groups on the surface of the inorganic material (such as glass, concrete, and metal oxides) to form strong Si-O-Si or Si-O-M (M represents metal) covalent bonds.

3) Self-crosslinking: The silanol groups between silane molecules also condense with each other, forming a crosslinked siloxane network structure on the material surface.

Function

Building Protection: Added to exterior wall coatings, it enhances smoothness and stain resistance, blocks moisture penetration, and extends building lifespan.

Rubber and Plastic Fittings: Enhances the anti-aging and wear resistance of rubber seals and plastic products, improves surface smoothness and weather resistance, and extends product lifespan.

Textile Functional Finishing: Imparts waterproof, oil-proof, and stain-resistant properties to textiles, improving their functionality and comfort.

Cultural Relics Protection: Provides acid corrosion and freeze-thaw resistance; used for surface reinforcement and weathering protection of stone and ceramic cultural relics.

High-End Industrial Applications: Suitable for various high-end fields such as glass anti-fogging and surface modification of ultrafine powders (e.g., surface treatment of stationary phases for chromatographic columns or separation materials).

Technical Specifications:

dentification	IR spectrum similar to that of RS
	HPLC retention time similar to that of RS
Related substance	Total impurities: NMT0.3%
	Single impurity: NMT0.1%
Loss on drying	NMT0.5%
Residue on ignition	NMT0.1%
Assay	98.5%-101.0%