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Application Properties and Main Functions of Coupling Agents in Various Industries
Author:LongKom  Time:2018-4-23

1. The bonding between metal and non-metal in structural adhesives can be condensed with metal oxides or with another silane alcohol if silane tackifiers are used, thus bringing the silicon atoms into close contact with the surface of the adhesives. If silane is added to NBR phenolic structural adhesive as tackifier, the bonding strength can be significantly improved.

2. Silane has been widely used as a treatment agent in bonding glass fibers at home and abroad. For example, the bonding peel strength of chloroprene adhesive is 1.07 kg/cm 2 when silane is not used as treatment agent, and 8.7 kg/cm 2 when amino silane is used as treatment agent.

3. Silane tackifier has special function in bonding rubber with other materials. It obviously improves the bonding strength of various rubber and other materials. For example, when glass is bonded to polyurethane rubber, the peeling strength of the adhesive is 0.224 kg/cm 2 without silane as treatment agent, and 7.26 kg/cm 2 with silane.

4. Adhesion problems that could not be solved with general adhesives can sometimes be solved with silane coupling agents. For example, aluminium and polyethylene, silicone rubber and metal, silicone rubber and organic glass, the corresponding silane coupling agent can be selected according to the chemical bond theory, and satisfactory solution can be obtained. For example, polyethylene can be bonded to aluminium foil with vinyl triperoxide tert-butylsilane (Y-4310); and silicone rubber can be bonded to metal with butadiene triethoxysilane with a tensile strength of 21.6-22.4 kg/cm 2.

General adhesives or resins combined with coupling agents can not only improve the bonding strength, but also increase the water resistance and durability of the bonding strength. For example, polyurethane and epoxy resin have high adhesion to many materials, but their durability and water resistance are not ideal. After adding silane coupling agent, their properties can be significantly improved.

The surface of inorganic powder modified by aluminate coupling agent is used in composite products. The inorganic and organic ends of coupling agent react with inorganic filler surface and organic resin respectively or form entanglement structure, which enhances the interfacial compatibility between inorganic powder and organic resin. Therefore, modification with aluminate coupling agent can not only improve the addition of plastic products filled with inorganic powder. Work performance, but also can significantly improve the physical and mechanical properties of products, so that the product water absorption rate is reduced, oil absorption is reduced, fillers are evenly dispersed.

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