The principle of glue bonding is mainly based on the theory of molecular diffusion and adsorption. When the molecules on the interface of the adhesive and the adherend diffuse and penetrate each other, they are combined together by intermolecular forces (such as hydrogen bonding and van der Waals forces) to form a strong bond. In addition, the adsorption theory believes that bonding is generated by molecular contact and interfacial forces between the two materials, and the main source is intermolecular forces.
The process of glue bonding includes the following steps: Surface treatment: Before bonding, the bonded surface needs to be properly treated to ensure good wetting and contact. Gluing: Apply the adhesive evenly on the surface of the adherend. Lamination: Lay the adherends coated with adhesive together. Curing: The adhesive is cured by chemical reaction or physical change after lamination to form a strong bond. Factors affecting the effect of glue bonding include the surface state of the adherend, the type and performance of the adhesive, and environmental conditions. For example, surface treatment can improve the surface energy of the adherend, thereby increasing the bonding strength; while the type and properties of the adhesive directly affect the bonding effect and durability.
