Siwin-91231
Siwin
Siwin-91231
3069-21-4
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N-Dodecyltrimethoxysilane (Siwin-91231) is a long-chain alkyl silane coupling agent manufactured by Siwin, a specialized silane producer with an annual production capacity of 5,000 metric tons. With CAS number 3069-21-4 and EINECS number 221-332-4, this product features a twelve-carbon alkyl chain attached to a silicon atom, providing distinct hydrophobic properties compared to short-chain alkyl silanes.
The product serves as a surface modification agent for inorganic materials, improving their compatibility with organic polymers and enhancing water resistance in composite systems. It finds application across industrial sectors including glass processing, construction materials, cultural heritage preservation, and filler treatment for polymer composites, supporting commercial procurement requirements for consistent batch quality and technical support.
The following table presents the key physical and chemical properties of Siwin-91231, with each parameter measured under specified test conditions:
Parameter | Value |
Product No. | Siwin-91231 |
Chemical Name | n-Dodecyltrimethoxysilane |
CAS No. | 3069-21-4 |
EINECS No. | 221-332-4 |
Molecular Formula | C15H34O3Si |
Appearance | Colorless Transparent Liquid |
Density | 0.8900 ± 0.0050 g/cm³ |
Refractive Index | 1.4270 ± 0.0050 |
Purity (by GC) | 96% |
Chemical Structure |  |
The Equivalent List
Momentive | Dow Corning | ShinEtsu | Evonik | Wacker |
|---|---|---|---|---|
N.A | N.A | N.A | N.A | N.A |
N-Dodecyltrimethoxysilane contains three methoxy groups (-OCH3) bonded to the silicon atom, which hydrolyze in the presence of moisture to form silanol groups (-Si-OH). These silanol groups then condense with hydroxyl groups on inorganic surfaces, forming stable covalent Si-O-Si bonds.
The twelve-carbon linear alkyl chain (dodecyl group) provides hydrophobic character to the treated surface. Unlike amino or epoxy functional silanes that serve as coupling bridges, dodecyltrimethoxysilane functions primarily as a hydrophobizing agent, reducing surface energy and water absorption of treated substrates. The long alkyl chain also contributes to improved compatibility with non-polar polymer matrices.
N-Dodecyltrimethoxysilane is used for surface modification of inorganic fillers including glass, silica, Al2O3, kaolin, mica, silicon carbide, and talcum powder. The treatment improves dispersion of fillers in organic polymer matrices and enhances the mechanical properties of composite materials. Typical dosage ranges from 0.5% to 2.0% by weight of filler, depending on specific surface area and application requirements.
The product serves as a key component in hydrophobic coating formulations for glass surfaces. It can be applied to blank glass and coated glass, including optical anti-reflective coatings, vacuum anti-reflective coatings, and reflective coatings. Treated glass surfaces exhibit reduced water contact angle hysteresis and improved resistance to moisture-induced fogging.
For historical relics, particularly outdoor monuments and artifacts, n-dodecyltrimethoxysilane provides water-repellent protection against corrosion, freeze-thaw damage, and efflorescence. The treatment penetrates porous stone and masonry surfaces, forming a hydrophobic barrier that reduces water absorption while maintaining vapor permeability.
In building materials, the silane is incorporated into waterproofing formulations for concrete, brick, and natural stone surfaces. It reduces capillary water absorption and protects structures from moisture-related degradation, extending service life in outdoor exposure conditions.
Siwin operates under ISO 9001 quality management system certification. Each batch of n-dodecyltrimethoxysilane undergoes gas chromatography purity analysis and physical property testing before shipment. A Certificate of Analysis (COA) is available upon request for every production batch. The product complies with REACH registration requirements for the European market. Technical support staff with background in silane chemistry are available to assist with formulation questions and application troubleshooting for enterprise customers.
N-Dodecyltrimethoxysilane is supplied in 210L iron drums with a net weight of 180 kg per drum. The product should be stored in a cool, dry place away from direct sunlight and moisture. Proper storage conditions maintain product stability for 12 months from the date of manufacture. Handling requires standard chemical safety precautions, including protective gloves and eye protection.
Under proper storage conditions in sealed original packaging, the shelf life is 12 months from the date of manufacture. Storage temperature should remain between 2°C and 30°C to prevent moisture-induced viscosity increase.
The dodecyl alkyl chain provides compatibility with non-polar polymer matrices, while the silane groups bond to the inorganic filler surface. This dual functionality reduces filler agglomeration and improves distribution throughout the polymer system.
Typical dosage ranges from 0.5% to 2.0% by weight of the filler. The exact amount depends on filler specific surface area, particle size distribution, and the desired level of hydrophobic modification.
Yes, the product is compatible with most epoxy resin systems. It is primarily used for filler hydrophobization rather than as a coupling agent, as it does not contain reactive functional groups that participate in epoxy curing.
