3-Ureidopropyltriethoxysilane (A-1160)
Key Features
- Ureido group provides hydrogen-bonding coupling to PA, PU, and polyester matrices
- Ambient-temperature stable — excellent pot life in sizing solutions and pre-treated fillers
- Thermal activation above 100°C for maximum coupling efficiency
- Complementary hydrogen bonding with amide groups in polyamide composites
- Long shelf life of pre-treated glass fiber mats and fillers
3-Ureidopropyltriethoxysilane (A-1160) features a urea-type functional group (–NH–CO–NH₂) that provides unique coupling characteristics compared to amine and vinyl silanes. The ureido group is a weak base and is particularly effective for coupling glass fibers and mineral fillers to nylon (polyamide), polyurethane, and certain epoxy resin systems where the moderate nucleophilicity of the urea hydrogen bonds provides enhanced adhesion.
The ureido functionality is non-reactive under ambient conditions, providing excellent pot life and storage stability in sizing solutions and pre-treated fillers. This makes A-1160 particularly valuable in size formulations for glass fiber that must be stored before use, and in pre-treated filler applications where the treated material must have long shelf life. The coupling activation occurs at elevated temperatures during hot pressing, pultrusion, or elevated-temperature cure of composites.
In fiberglass-reinforced nylon (PA6, PA66) and polyurethane composites, A-1160 provides superior adhesion compared to aminosilanes due to the complementary hydrogen bonding between the ureido groups and the polymer amide or urethane linkages. This hydrogen bonding creates a more mechanically compatible interface and reduces stress concentration at the fiber-matrix boundary. A-1160 is also used in glass fiber mat for sheet molding compounds and in glass fiber reinforced thermoplastic injection molding grades where the activation temperature of the urea coupling is compatible with processing.
Specifications
| Parameter | Value |
|---|---|
| Purity | ≥ 96.0% |
| Appearance | Colorless to pale yellow liquid or solid (mp ~30°C) |
| CAS Number | 23779-32-0 |
| Flash point | >110°C |
| Boiling point | >300°C |
| Chemical name | 3-Ureidopropyltriethoxysilane |
| Density (20°C) | 1.010–1.020 g/cm³ |
| Molecular weight | 264.4 g/mol |
Applications
FAQ
In glass-fiber-reinforced nylon (GF-PA), the interface between glass fiber and nylon matrix is critical for mechanical performance. A-1160 (ureido silane) forms hydrogen bonds with the amide linkages in nylon that are more mechanically compatible than the more polar amine-amine interface from A-1100. The ureido group also has better thermal stability than primary amine in high-temperature nylon processing (250–280°C), reducing degradation at the interface during injection molding.
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