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How to keep the adhesive sticky?
17 May 2025
Research work and experience show that adhesives can be bonded to things by intermolecular attraction, and the adhesion between interfaces is composed of secondary and mechanical forces, among which secondary force is the main force generating adhesion.
The realization of this adhesive relay can be considered as having two stages:
The first stage is that the flowing glue molecules spread to the surface of the bonded object with the help of Brownian motion and gradually approach, while the fluidity of the glue solution (viscosity is smaller) and the application of curing pressure are conducive to the contact and approach between the molecules;
The second stage is the generation of intermolecular adsorption. When the distance between the adhesive molecules and the surface molecules of the adhesive is close to, the secondary valence force begins to play a role and increases with the reduction of the distance between the adhesive molecules and the surface molecules.
These two processes cannot be completely separated, the glue liquid before curing has been in progress. It can be seen that the adhesive can promote full contact with the surface of the adhesive. The close distance between the two molecules is the key to obtain the adhesive force.
Therefore, for the same adhesive, the viscosity of the glue itself is large or in the construction, try to make it thin and hot fast Brownian motion heating measures and curing pressure and curing time extension, the surface of the adhesive is smooth, clean, dry are the conditions to obtain the best adhesion.
