Curing of adhesives

The curing of adhesives is a process in which curing agents or accelerators play a role, which is usually divided into three kinds: chemical curing, physical curing, and heating curing.

Chemical curing is the process of promoting a curing reaction through a chemical reaction, such as the curing of epoxy adhesives. Its advantages are fast curing speed, and high bonding strength, but poor heat resistance.

Physical curing is the process of promoting the curing reaction through physical action, such as the curing of polyurethane adhesives. Its advantage is better heat resistance, but the curing speed is slow.

Heat curing is the process of promoting the curing reaction by heating, such as the curing of hot melt adhesives. Its advantage is that the bonding process is simple, but the temperature resistance is poor.

For example, epoxy resin adhesives are a common adhesive whose curing process is facilitated by chemical reactions. When the epoxy resin adhesive is applied on the surface of the object, the epoxy resin and the curing agent react chemically to generate a three-dimensional structure network, so that the adhesive loses its fluidity and achieves permanent bonding. In this process, the role of the curing agent is to provide the active groups required for chemical reactions, such as the addition of an acidic curing agent in epoxy resin, through an acid-base neutralization reaction to generate a three-dimensional structure of the network, to achieve bonding curing.

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