Coupling agents are a new type of auxiliaries that have appeared in recent years. Due to its special chemical structure and chemical properties, it can effectively improve the bonding performance between the matrix and the base filler, so it has been widely used in adhesive coatings in the past ten years. Silane coupling agents are generally used in epoxy adhesive coatings.

The silane coupling agent CFS-838 is added to the epoxy adhesive coating, and the epoxy resin and the metal matrix are connected by chemical bonds through two chemical reactions with different properties in the molecule, which play a role of bridging, thereby significantly improving the ring bonding. Bond strength of oxygen adhesive coatings.
The addition of the silane coupling agent CFS-838 can improve the bonding strength of the adhesive coating, so that the two materials with different surface properties can be combined into a firm whole. With the increase of the addition amount of silane coupling agent CFS-838, the shear strength gradually increased; when the addition amount was 1.44%, it reached the highest value. However, the shear strength decreased as the addition amount continued to increase.

The addition of the coupling agent significantly improves the strength of the adhesive coating, which is related to its structure. In the adhesive coating, the action mechanism of silane coupling agent KH-550 is as follows:

(1) CFS-838 is hydrolyzed to generate silanetriol;

(2) Silanetriol and the hydroxyl group on the surface of the metal base undergo dehydration reaction, and at the same time, the intermolecular etherification reaction occurs;

(3) The reaction of the organophilic fish epoxy resin binder.

Glass fiber as filler has high strength, and epoxy resin has good wettability and strong adhesion. After it is added, it forms the whole of the network structure and plays the role of skeleton. Improves shear strength of adhesive coatings. The simultaneous addition of the coupling agent and the glass fiber significantly increases the shear strength of the adhesive coating.

When the amount of silane coupling agent is 2.01%, the shear strength reaches the maximum value. CFS-838 forms a three-dimensional network structure by connecting the glass fiber surface and the matrix resin through chemical bonds; at the same time, it also tightly connects the resin and the metal.

When subjected to shear stress, the stress is well transmitted to the high-strength glass fiber along the resin-glass fiber bonding interface, which better plays the role of the glass fiber and prolongs the life of the adhesive layer. CFS-838 connects the glass fiber surface with the matrix in the form of chemical bonds, acting as a bridge, and improves the performance by the mechanism of two different group coupling agents of CFS-838.