Aminosilane oligomers are a class of organosilicon compounds with amino functional groups, which form oligomeric structures through silicon-oxygen bonds (Si-O-Si). Compared with monomeric aminosilanes, their oligomers have more advantages in stability, compatibility and application performance, and are widely used in material modification and industrial fields. The following are its core advantages and main uses:
I. Advantages of aminosilane oligomers
1. Higher stability
- The oligomer structure reduces the easily hydrolyzed monomeric silane (such as Si-OR group), is more stable during storage and use, and is not easy to self-polymerize or gel.
- Reduced sensitivity to moisture, suitable for long-term storage.
2. Excellent compatibility
- The molecular weight of the oligomer is moderate, which can be better compatible with organic polymers (such as epoxy resins, polyurethanes) and inorganic materials (such as glass, metal oxides) to avoid phase separation.
3. Enhanced interfacial bonding
- Amino groups (-NH₂) provide reactive activity and can react with functional groups (such as epoxy and carboxyl) of resin, coating and other systems to form chemical bonds;
- The siloxane part bonds with inorganic surfaces (such as glass and metal) through hydrolysis and condensation to achieve strong bonding between organic and inorganic materials.
4. Low volatility and environmental protection
- The volatility of oligomers is lower than that of monomer silanes, which reduces VOCs emissions and is more in line with environmental protection requirements.
5. Multifunctionality
- Amino groups can be further derivatized (such as reacting with isocyanates and anhydrides) to expand application scenarios.
2. Main uses
1. Composite material reinforcement
- Fiber/filler treatment: used for surface modification of glass fiber, carbon fiber or mineral filler, to enhance the interfacial bonding with resin matrix (such as epoxy and nylon), and to improve the mechanical strength of composite materials.
- Nanomaterial dispersion: improve the dispersibility of silica, carbon nanotubes, etc. in polymers.
2. Adhesives and sealants
- As a tackifier, it improves the adhesion of epoxy, polyurethane and other adhesives to metal and glass, especially in high temperature and high humidity environments.
3. Paints and coatings
- Anti-corrosion coatings: By enhancing the bonding between the coating and the metal substrate, corrosion is delayed; amino groups can also cross-link with resins to increase the hardness of the coating.
- Wear-resistant coatings: used on ceramic or metal surfaces to improve wear resistance and durability.
4. Electronic packaging and packaging materials
- Used in semiconductor packaging glue and LED packaging glue to improve the adhesion between silicone and substrates while reducing internal stress.
5. Rubber and plastic modification
- Added to silicone rubber or engineering plastics to improve aging resistance, mechanical properties and processing fluidity.
6. Biological and medical materials
- Modify the surface of biosensors or medical catheters to improve biocompatibility; amino groups can also be used to fix proteins or drug molecules.
7. Other fields
- Paper processing: Improve the wet strength and wrinkle resistance of paper.
-Textile finishing: used as a softener to enhance the smoothness and durability of fibers.
3. Typical application cases
-Automotive industry: used for glass fiber reinforced nylon parts to reduce weight and increase strength.
-Wind turbine blades: treat carbon fibers to enhance the fatigue performance of epoxy resin composites.
-Electronic devices: improve the bonding reliability of glass and frame in mobile phone screen adhesives.
Summary
Aminosilane oligomers have outstanding performance in interface bonding, material modification and functionalization through their unique organic-inorganic hybrid structure, and are particularly suitable for high-performance composite materials, electronic packaging and environmentally friendly coatings. Its oligomerization design solves the stability problem of monomer silane while retaining its reactivity, and is an important auxiliary agent in fine chemicals and high-end manufacturing.
