January 06 , 2025Bonding Mechanism and Binder Formulation
In the research and understanding of the bonding mechanism of adhesives to abrasives and substrates in the manufacture of coated abrasives, many theoretical viewpoints have been proposed, but no consensus has been reached. The main bonding mechanisms are physical adsorption theory, mechanical bonding theory, diffusion theory, electrostatic theory, and chemical bond theory. Physical adsorption theory is often used to explain why abrasives are bonded to the substrate. According to the material structure theory, there are main valence forces of chemical bonds and weaker van der Waals forces (including bond forces, dipole forces, induced dipole forces, and dispersion forces) between atoms and molecules in the aggregated state of the material. The solid surface adsorbs liquids and gases due to the van der Waals force. This effect is called physical adsorption. Due to the physical adsorption effect, the adhesive completely infiltrates the surface of the adherend before curing, and the molecules are close enough to each other, so the van der Waals force between the molecules has a high adhesion strength.
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