Silane Coupling Agents

Silane coupling agents are a class of organosilicon compounds with a special structure, represented by the general formula Y-R-Si(OR')₃. Here, Y denotes organic functional groups (such as amino, epoxy, vinyl, etc.), R represents a short-chain alkyl group, and OR' signifies a hydrolyzable alkoxy group (such as methoxy, ethoxy). These products are capable of constructing a "molecular bridge" between organic polymers and inorganic materials, significantly enhancing the interfacial bonding strength of composite materials. They are widely used in the fields of rubber, plastics, coatings, adhesives, and high-performance composite materials.

Mechanism of action and performance advantages:

1. Dual reactivity

Inorganic end: The -Si(OR')₃ group in silane hydrolyzes to form silanol (-Si(OH)₃), which undergoes a condensation reaction with the hydroxyl (-OH) groups on the surface of inorganic fillers (such as glass fibers, silica, metal oxides, etc.), forming stable Si-O-M covalent bonds (M represents the inorganic substrate).

Organic end: Y functional groups (such as amino groups, epoxy groups) can be chemically reacted or physically entangled with polymer matrices (such as epoxy resins, polyolefins, rubbers, etc.) to achieve molecular-level interfacial coupling.

2. Performance improvement effect

Enhance dispersibility: Improve the dispersibility of inorganic fillers in organic matrices, avoid agglomeration, and enhance material homogeneity.

Mechanical property optimization: By reducing interfacial defects through chemical bonding, the tensile strength, impact toughness, and wear resistance of composite materials are significantly enhanced.

Weather resistance and durability: The stability of siloxane bonds (Si-O-Si) can withstand environmental aging factors such as heat and humidity, ultraviolet radiation, etc., thereby extending the lifespan of the material.

Electrical insulation: In electronic packaging materials, silane coupling agents can reduce dielectric loss and enhance insulation reliability.

Typical application areas:

1. Polymer composite material

Glass fiber reinforced plastic (GFRP): It enhances the interfacial bonding between glass fibers and resins (such as epoxy and unsaturated polyester) to avoid stress cracking.

Mineral-filled polyolefin: PP/PE systems filled with calcium carbonate and talcum powder to improve processing fluidity and mechanical properties.

2. Rubber industry

Reinforced tire with silica: Promotes the interaction between silica and rubber molecules (such as SBR, NR), reduces rolling resistance, and enhances grip.

3. Coatings and adhesives

Metal/ceramic coating: Enhances the adhesion of organic coatings to the substrate and improves corrosion resistance.

Sealant: Improve the bonding strength of silicone adhesive to glass and concrete.

4. Electronic materials

Semiconductor packaging: Improving the interfacial reliability between epoxy molding compound and chip carrier.

Product Features:

Functional group diversity: Provides different types such as amino (KH-550), epoxy (KH-560), vinyl (KH-171), etc., suitable for a variety of polymer systems.

Efficient coupling: With a low addition amount (0.5% to 2%), it can significantly optimize performance, offering high cost-effectiveness.

Environmental friendliness: Some models comply with RoHS/REACH regulations, making them suitable for the development of green materials.

This product series offers multiple grades tailored for different applications. For precise product selection, please contact our sales engineers to receive customized solution recommendations.