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PUR hot melt adhesive
The curing process of PUR hot melt adhesive (reactive polyurethane hot melt adhesive) has unique dual characteristics. In its initial curing stage, a bonding interface is formed through physical solidification, and then a chemical cross-linking reaction is triggered by contact with moisture in the environment, which releases trace amounts of carbon dioxide into the atmosphere. With the increase of crosslinking degree, the adhesive layer gradually forms a polymer with a three-dimensional network structure, endowing the material with excellent cohesive strength and interface stability.