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Uses and selection of silane coupling agent

Uses and selection of silane coupling agent2016.09.12

Silane coupling agent is a class of organic compounds containing silicon atoms. It can enhance affinity between organics and inorganics, as well as enhance the physical and chemical properties of the composite, such as strength, toughness, electrical properties, water resistance and corrosion resistance.

Main uses of silane coupling agent are as follows:

It is a kind of double function molecule. It not only can react with inorganic filler, but also can react with organic polymer. It functions as a variety of mineral filler polymer viscosity and accelerator and improve the mechanical properties and electrical properties. When combined with inorganic filler, this product can make the surface of the filler hydrophobic. This effect can improve the compatibility between the filler and polymer. Thereby makes it better dispersion, lower melt viscosity and easy processing of filled plastics.


Superfine powder active halogen-free flame retardant agent produced by modified aluminum hydroxide and magnesium hydroxide fundamentally solve the ultrafine particle coalescence, insufficient modification and uneven dispersion problem. As a result, the flame retardant is widely used in the flame retardant of electric wire and cable, engineering plastics, decorative materials, coating and fabric.

It improves the adhesion of printing ink, glue and paint on the surface of glass, ceramic or metal. It has lower cost than ceramic melting process.

When it used for the treatment of glass fiber reinforced materials, it can improve the wet mechanical properties of the composite materials and the stability of electrical properties. As a tackifier of epoxy resin, polyurethane, chloroprene rubber adhesives and sealants can greatly improve the dry adhesion of resin to glass or metal substrate, as well as improve wet adhesion retention rate.

In the two types of properties of silane coupling agent, the Y group is the most important one, which directly determines the application effect of silane coupling agent. Bonding strength of organic adhesive can be improved only when the Y group can react with the corresponding matrix resin. Generally requirement is the Y groups can be able to mixed with the resin and has coupling reaction, so the silane coupling agent containing the appropriate Y group must be selected for different resins. When Y is non reactive alkyl or aryl, it is not available to the polar resin. But it can be used in the bonding of non polar resin, such as silicone rubber, polystyrene, etc. When Y is a reactive functional group, it should pay attention to reaction and phase solubility with the resin used. Amino silane coupling agent is universal, it almost can be coupled with a variety of resins, but other than polyester resin.

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