What Is Adhesive?
Adhesives are tools used to attach substances to substances.
Various types of adhesives vary in terms of the materials to be joined, the temperature at which they are used, and the time required for adhesive strength to develop after bonding. Therefore they should be selected according to the intended use. There are also various conditions under which adhesives cure, such as temperature conditions and the presence or absence of moisture or gas. In addition to the commonly known one-component adhesives, there are also two-component adhesives that can be bonded by mixing the main agent and curing agent.
Uses of Adhesives
A wide range of adhesives is sold, from low-viscosity and smooth ones to high-viscosity and vicious ones. Adhesives with low viscosity can, for example, be post-penetrating, meaning they penetrate through gaps in the threads after the screw has been secured.
Adhesives with high viscosity can be used not only to bond but also to block water and air from entering or leaving the area.
Adhesive Principle
Industrial joining includes screwing, riveting, and welding. Adhesives are used for joining plastic, soft materials, or materials that cannot be tapped by screwing or for joining at an angle. For metal-to-metal joints, welding is sometimes used in addition to adhesive bonding but at a higher cost. Adhesives have recently improved in performance, and a wide variety of adhesives are available for various applications, including those with bonding capabilities as strong as welding and anaerobic adhesives that begin bonding immediately after exposure to air.
Adhesion principles include mechanical bonding, chemical interaction, and physical interaction. Mechanical bonding occurs when the adhesive penetrates the pores and crevices of the material’s surface and cures there. Chemical interactions are formed by chemical reactions in which the adhesive and the object to be bonded share each other’s electrons (i.e. form covalent bonds between atoms). Physical bonding is referred to as intermolecular forces or van der Waals forces and occurs due to the intermolecular attraction that occurs when the adhesive and the object are brought closer together at the atomic level.