Siwin-AB31
Siwin
Siwin-AB31
3068-76-6
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N-phenyl-3-aminopropyltrimethoxysilane, designated Siwin-AB31, is an aromatic amino-functional silane coupling agent with the molecular formula C12H21NO3Si and a molecular weight of 255.39 g/mol. It carries the CAS number 3068-76-6 and the EINECS number 221-328-2. The molecule features a secondary aromatic amine structure with a phenyl group attached to the nitrogen atom, connected to a trimethoxysilylpropyl chain.
The compound contains two reactive centers: a secondary aromatic amine group that reacts with epoxy, phenolic, and certain thermoplastic resins, and three trimethoxy groups that hydrolyze and bond to inorganic surfaces. The phenyl substitution on the nitrogen atom imparts higher thermal stability and improved compatibility with aromatic resin systems compared with primary amino silanes. This structural feature also reduces the reactivity rate, providing longer pot life in certain formulations.
Property | Value |
|---|---|
Chemical Name | N-phenyl-3-aminopropyltrimethoxysilane |
CAS NO. | 3068-76-6 |
EINECS NO. | 221-328-2 |
Formula | C12H21NO3Si |
Molecular Weight | 255.39 |
Appearance | Yellowish clear liquid |
Purity | ≥95% |
Density (ρ20, g/cm³) | 1.07 |
Boiling Point | 310°C |
Refractive Index (n25D) | 1.504 |
The product is soluble in common organic solvents including ethanol, acetone, toluene, and xylene. It hydrolyzes gradually in the presence of moisture, releasing methanol and forming reactive silanol groups. Purity is determined by gas chromatography (GC) analysis. Each production batch is supplied with a Certificate of Analysis detailing all test results.
In UV-curable and solvent-based ink formulations, Siwin-AB31 functions as a crosslinking agent and adhesion promoter. The aromatic amine group participates in the curing reaction, enhancing printing fastness, abrasion resistance, and solvent resistance of ink films on plastic and metal substrates. It is particularly suited for applications involving engineering plastic housings and electronic component marking, where adhesion and durability under environmental stress are required.
Siwin-AB31 serves as a bonding agent for filled or reinforced resin systems used in adhesive and sealant formulations. It improves adhesion between organic polymer matrices and inorganic fillers or substrates, contributing to enhanced bond strength and long-term durability. The secondary amine structure provides balanced reactivity that supports both initial bond development and extended working time in certain formulations.
In silicone rubber compounds, Siwin-AB31 acts as a crosslinker and adhesion promoter, improving the bonding of silicone elastomers to various substrates including metals, glass, and engineering plastics. It is also used in epoxy and phenolic resin systems to enhance mechanical properties and interfacial adhesion in reinforced and filled composites. The aromatic structure contributes to improved thermal stability of the cured resin matrix.
Typical addition levels range from 0.5% to 2.0% by weight of the total formulation, depending on the resin system, filler loading, and specific performance targets. For surface treatment applications, a 1% to 5% solution in appropriate solvent is commonly used. Optimal dosage should be determined through systematic laboratory trials. The product should be handled in well-ventilated areas with appropriate personal protective equipment.
Siwin-AB31 is compatible with epoxy resins, phenolic resins, silicone polymers, and certain acrylic and polyurethane systems. Its secondary amine structure provides lower reactivity compared with primary amino silanes, which can be advantageous in formulations requiring longer pot life or controlled curing rates. Compatibility with specific resin grades should be verified prior to commercial production.
Siwin-AB31 is available in 200L PVF steel drums, with custom packaging options available for commercial procurement orders. The product should be stored in tightly sealed containers in a cool, dry area away from direct sunlight and moisture. Exposure to humid air should be minimized to prevent premature hydrolysis.
Each production batch undergoes standardized testing including GC purity analysis, density measurement, refractive index determination, and visual inspection. The manufacturing process follows established quality control protocols to ensure batch-to-batch consistency. Technical support personnel are available to assist enterprise customers with application development, formulation optimization, and troubleshooting.
Siwin-AB31 contains a secondary aromatic amine (N-phenyl) structure, whereas primary amino silanes have an NH2 group. The phenyl substitution provides higher thermal stability, improved compatibility with aromatic resin systems, and reduced reactivity rate, resulting in longer pot life in certain formulations.
Siwin-AB31 is compatible with epoxy resins, phenolic resins, silicone polymers, and selected acrylic and polyurethane systems. Its aromatic amine structure provides enhanced compatibility with resins containing aromatic components compared with aliphatic amino silanes.
Store in original, tightly sealed containers in a cool, dry location away from direct sunlight and sources of moisture. Once opened, it is recommended to use the contents promptly or maintain a dry inert gas blanket to prevent moisture-induced hydrolysis.
Yes, Siwin-AB31 is used in UV-curable ink formulations where the aromatic amine group participates in crosslinking reactions, contributing to improved printing fastness, abrasion resistance, and solvent resistance of cured ink films on various substrates.
Yes, technical support is available to assist business buyers with formulation optimization, compatibility testing, and application-specific guidance. The support team can provide recommendations on dosage levels, mixing procedures, and performance evaluation methods for specific industrial applications.
