hot melt adhesive dtf powder manufacturer is a kind of polyurethane that can be plasticized by heat and dissolved by solvent. Compared with mixed and cast polyurethanes, thermoplastic polyurethanes have little or no chemical crosslinking in chemical structure, and their molecules are basically linear, but there is a certain amount of physical exchange.
The concept of so-called physical exchange was developed in 1958 by SchollenbergeC S. First, it is proposed that there is a "connection point" between linear polyurethane molecular chains that is reversible in the face of heat or solvent, which is not actually chemical crosslinking, but plays a role in chemical crosslinking. Due to this physical crosslinking, polyurethanes form the theory of multiphase morphology, and the hydrogen bond of polyurethanes strengthens its morphology and makes it withstand higher humidity.
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