The TPU one is synthetic
Submitted by super
.The TPU one is synthetic
TPU can be divided into a footwork and gathered the law in advance while formating the method, because response conditions are different, greater difference appears in the performance of the polymer. Among them the best method is that a footwork uses one pair of spiral shells' pole pushing out of machine to produce TPU. TPU had to a step legal system, it is one kind that inlays a section of line type polymer basically, the basic response type is:
2nOCN-R-NCO+nHO-R'-OH+nHO-R" -OH CONH-R-NHCOO-R'-O-CONH-R-NHCOO-R" -On