A-LINK35
Momentive
2931900090
Siwin-AL31
15396-00-6
| Quantity: | |
|---|---|
3-Isocyanatopropyltrimethoxysilane is a bifunctional organosilane that carries both an isocyanate group (-NCO) and a trimethoxysilyl group within the same molecule. This dual-reactivity structure enables the compound to function as a molecular bridge between organic polymers and inorganic substrates, which is the fundamental mechanism behind its role as a crosslinker and adhesion promoter in industrial formulations.
The chemical formula of 3-isocyanatopropyltrimethoxysilane is C₇H₁₅NO₄Si. The molecule features a three-carbon propyl chain that connects a trimethoxysilyl group at one end to an isocyanate group at the other. The trimethoxysilyl moiety undergoes hydrolysis in the presence of atmospheric moisture to form silanol groups, which subsequently condense with hydroxyl groups on inorganic surfaces such as glass, metal oxides, and mineral fillers. Simultaneously, the isocyanate group reacts with active hydrogen-containing functional groups — including hydroxyls, amines, and urethanes — found in many organic polymers. This dual reaction pathway establishes covalent bonds across the organic-inorganic interface, thereby improving adhesion and composite integrity.
The following table preserves the original product parameters as published on the source page:
Parameter | Value |
|---|---|
Product No. | Siwin-AL31 |
Chemical Name | 3-Isocyanatopropyltrimethoxysilane |
CAS NO. | 15396-00-6 |
Formula | C7H15NO4Si |
Appearance | Colorless to yellowish clear liquid |
Purity | ≥ 98% |
Density (ρ20°C, g/cm³) | 1.071 |
Boiling Point | 203.8°C |
Molecular Weight | 189.28 |
Refractive Index | 1.421 |
Additional reference parameters for procurement evaluation:
Parameter | Value | Test Condition |
|---|---|---|
EINECS No. | 239-415-9 | — |
Flash Point | 108°C | Closed cup |
Refractive Index | 1.421 | 25°C |
HS Code | 2931900090 | — |
Equivalent Grade | Momentive A-LINK 35 | Comparative reference |
3-Isocyanatopropyltrimethoxysilane serves as a crosslinker and adhesion promoter across multiple industrial sectors where organic-inorganic bonding performance directly affects end-product quality.
In adhesive and sealant formulations, particularly those based on polyurethane prepolymers and acrylic systems, this silane functions as both a coupling agent and a crosslinking agent. It promotes adhesion to a range of substrates — including glass, aluminum, steel, and other inorganic surfaces — and delivers wet adhesion performance under humid conditions. The isocyanate group reacts with urethane linkages in the polymer matrix, while the silane end anchors to the substrate surface, creating a durable bond line that resists moisture ingress.
In coating applications, 3-isocyanatopropyltrimethoxysilane improves the adhesion of organic coatings to metallic and glass substrates. Its trimethoxysilyl groups hydrolyze and condense with surface hydroxyls on the substrate, forming a siloxane network that enhances coating adhesion and resistance to delamination. The isocyanate functionality can also react with binder resins to improve crosslink density and chemical resistance of the cured film.
In the production of silane-crosslinked polyethylene (XLPE) cables and pipes, this silane is used to improve the affinity between glass fiber or inorganic fillers and the resin matrix. The silane grafts onto the polyethylene chain during compounding and subsequently crosslinks under moisture exposure, contributing to the heat resistance, mechanical strength, and dimensional stability of the finished cable insulation and pipe walls.
Suitable polymer systems include acrylics, silicones, and polyurethane prepolymers, where the isocyanate-silane bifunctionality provides both adhesion promotion and crosslinking capability.
The standard packaging for 3-isocyanatopropyltrimethoxysilane is 200L PVF-lined steel drums. Alternative packaging options are available upon request to accommodate different shipment volumes and handling requirements. Each drum is labeled with product identification, batch number, manufacturing date, and safety hazard markings in compliance with international transport regulations.
The product should be stored in a cool, dry place, protected from direct sunlight and moisture. Because the isocyanate and trimethoxysilane groups are both moisture-sensitive, the container must remain tightly sealed when not in use. Storage under nitrogen blanketing is recommended to extend shelf life and prevent premature hydrolysis. Under proper storage conditions, the product maintains its specified purity for 12 months from the date of manufacture.
Siwin-AL31 is manufactured under an ISO 9001:2015 certified quality management system. Each production batch undergoes gas chromatography (GC) analysis to verify purity, along with density measurement and refractive index testing to confirm conformance with published specifications. A Certificate of Analysis (COA) is available for every shipment upon request.
This silane promotes adhesion to a wide range of inorganic substrates, including glass, aluminum, steel, and other metal oxides, as well as to difficult-to-bond materials such as nylon and certain engineering plastics. The actual bond strength depends on the specific substrate surface preparation and the polymer matrix used.
Yes, 3-isocyanatopropyltrimethoxysilane is compatible with polyurethane prepolymers. The isocyanate group in the silane can react with polyols and isocyanate components in the PU formulation, while the silane end provides adhesion to inorganic substrates. It is commonly used in moisture-curing PU sealants and adhesives.
Typical addition levels range from 0.5% to 3.0% by weight of the total formulation, depending on the application, substrate type, and desired performance. For optimal results, dosage should be determined through laboratory testing that simulates the specific processing conditions and end-use requirements.
3-Isocyanatopropyltrimethoxysilane is a moisture-sensitive liquid. Operators should wear appropriate personal protective equipment, including chemical-resistant gloves, safety goggles, and protective clothing. Handling should take place in a well-ventilated area to avoid inhalation of vapors. Contact with skin, eyes, and clothing should be avoided. Refer to the Safety Data Sheet (SDS) for complete handling and first-aid instructions.
Yes, sample quantities are available for evaluation and formulation testing. Contact the technical sales team to request samples, specify the required quantity, and discuss application requirements. Technical support for formulation development is also available upon request.
