The reaction of TPU, ie, the reaction of -OH with -NCO to form the amino acid ester-NHCOO-, includes: the reaction of a long-chain alcohol with an isocyanate to form a so-called soft segment, which reacts with an isocyanate to form a so-called hard The mass segment is combined with urethane to form a molecular chain containing a soft segment and a hard segment.

　　TPU film construction

　　The molecular weight of the TPU film varies greatly depending on the R value at the time of processing, that is, the molecular value varies greatly in the molecular formula, and there are tens of thousands of changes.

　　Each TPU molecular chain contains a hard segment and a soft segment, which are formed by interaction, which is a so-called multiblock copolymer.

　　In addition, in the TPU which is completed by polymerization, how is the hard segment combined? If 1.4BG is short-chain diol (B) and MDI is diisocyanate (M), the hard segment is (MB) bonded, or is ( MBMB) combined, or how large (n) (n), and its distribution state, differs from the raw materials and reaction conditions - but the results of the reaction must be considered as the focus of the formulation.

　　TPU film is mainly used for the bonding of high-grade fabrics, and can be applied to clothing and footwear thermal underwear and cold film for agriculture.