3-(Dimethoxymethylsilyl)propylamine CAS NO: 3663-44-3 QM-A530

3-Aminopropylmethyldimethoxysilane is a commonly used surface treatment agent for glass fibers in the manufacture of glass fiber-reinforced plastics (GFRP). During production, glass fibers are prone to developing surface micro-cracks, which can reduce the strength of the resulting composite material if used untreated. Treatment with this coupling agent effectively fills these surface micro-cracks and improves interfacial bonding between the fibers and the resin matrix. This not only significantly enhances the interlaminar shear strength and flexural strength of the composite but also improves its electrical properties in humid environments and extends its service life.

As an adhesion promoter, this compound is widely used in water-based coatings and adhesives. In coating systems, it forms a monolayer on inorganic substrates—such as glass, metal, and concrete—firmly anchoring polar organic coatings to the substrate and thereby greatly improving water, corrosion, and scrub resistance. In the production of polysulfide sealants and polyurethane adhesives, the addition of an appropriate amount of this product significantly boosts bond strength to substrates like glass and aluminum, ensuring effective sealing.

Leveraging the dual reactivity of its amino and siloxane groups, 3-aminopropylmethyldimethoxysilane is frequently used for the surface modification of biomaterials. It enables the immobilization of bioactive molecules—such as enzymes, antibodies, and cell-adhesion peptides—onto glass, silica, or metal surfaces for applications in biosensors, cell culture dishes, and enzyme immobilization carriers. Because the modification process is relatively mild and helps preserve the activity of the biomolecules, the compound holds significant value in the field of biomedical engineering.

This substance is a key raw material for synthesizing amino-functional silicone oils. Through equilibration reactions with compounds such as D4 (octamethylcyclotetrasiloxane), polysiloxanes featuring amino groups in their side chains or at their terminal ends can be produced. Such amino-functional silicone oils are widely used in textile softening processes, imparting softness, smoothness, antistatic properties, and wrinkle resistance to fabrics, thereby significantly enhancing their performance and tactile quality.

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