Breathable water-absorption PU (polyurethane) resin for shoes

Abstract

The invention relates to breathable water-absorption PU (polyurethane) resin which contains the following materials by total mass percent of a reaction system: (A) 10%-12% of diphenylmethane-4,4 '-diisocyanate; (B) 15%-20% of polyol compounds; (C) 0.8%-2% of dual-hydroxy organosilicon modified by propylene oxide; (D) 2%-3.5% of diol chain extender; and (E) 60 % -70% of solvent, wehrein the mass ratio of polyester polyol to polyether polyol is 1.5:1-4:1, the mass ratio of dual-hydroxy organosilicon modified by propylene oxide to polyol compounds is 1:19-3:17. In the invention, the dual-hydroxyof organosilicon is allowed to react with the diisocyanate in the materials and then connected to a resin structure. Due to the interface activation of the organosilicon, uniform cells are formed on the resin; more important, as the organosilicon is modified by propylene oxide, the speed of solidification at the surface of the resin is slowed greatly, therefore vertical cells can be formed; and after the surface of synthetic leather is polished, the vertical openings of the cells are opened and finally vertical water channels are formed, therefore the resin has excellent breathable and water-absorption properties.

Description

technical field [0001] The invention relates to a breathable and water-absorbing PU resin for shoes, which is specifically applied in the industry of synthetic leather for shoes and belongs to the technical field of chemical industry. Background technique [0002] Although PU synthetic leather is closer to natural leather in appearance and internal results, it is far inferior to natural leather in some properties such as breathable and water-absorbing properties. The reason is that PU synthetic leather itself has relatively dense foam. Pore ​​structure, so the air permeability is poor, and this air permeability is an important evaluation criterion in the field of synthetic leather for shoes. Because if the air permeability and water absorption are poor, it is not easy to discharge foot sweat, and the wearing comfort is poor. In order to improve the air permeability of synthetic leather for shoes, researchers in this industry have carried out a lot of related research. Suzho...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a breathable and water-absorbing PU resin for shoes in view of the technical problem of poor air permeability of PU synthetic leather. The breathable and water-absorbing PU resin for shoes is considered from the resin synthesis itself, and special substances are introduced into the resin synthesis. Propylene oxide modified dihydroxy silicone, reacting this modified silicone into the resin, makes it easier to form vertical moisture channels when the resin containing the modified silicone structure is made into leather, thus greatly improving the resin. Breathability and water absorption