Wet-type high-peel-strength polyurethane resin and preparation method thereof

Abstract

The invention discloses a wet-type high-peel-strength polyurethane resin and a preparation method thereof. According to the invention, a special polyester polyol is adopted; the difference of the special polyester polyol from the common adipic acid series polyester in that the polyester polyol has a soft segment structure, the flexibility of the soft segment part in the molecular chain is reducedand the rigidity is increased due to the rigid chain segment with a benzene ring in the polyester polyol, so that the polyurethane resin has excellent peel strength; the terephthalic acid dihydric diol structure of the polyester is similar to the molecular structure of the polyester cloth, so that the resin can be well combined with a cloth base during tanning; and based on the low flexibility ofthe terephthalic acid chain segment, the crystallization of the soft segment is reduced, so that the phase separation of the soft segment and the hard segment is reduced, the cohesion is reduced, thecurling degree during leather surface drying is reduced, and the leather surface flatness is improved.

Description

technical field [0001] The invention relates to the technical field of polyurethane synthetic leather, in particular to a wet-type high-peeling-strength polyurethane resin and a preparation method thereof. Background technique [0002] Wet-process polyurethane synthetic leather is the best substitute product for the new generation of natural leather. It has excellent properties, such as good air permeability, moisture permeability, smooth and plump feel and excellent mechanical strength, especially from the structure similar to natural leather. , so its products are widely used in clothing, shoes, bags, car cushions, sofas and other fields. [0003] Among them, high-stripping polyurethane synthetic leather is very popular in the sports shoe market, and has gradually replaced genuine leather to process sports shoes. Higher peel strength means that it can remain intact under harsher physical and mechanical impacts, so the pursuit of higher peel strength has always been a mark...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of the limitation of the strength of the molecular chain itself caused by the soft and hard block structure of the wet high-peeling polyurethane, and the limitation of the peeling strength due to the insufficient bonding force between the polyurethane resin and the base cloth, the present invention provides a kind of molecular chain with higher strength. High, wet type high peel strength polyurethane resin with better bonding strength with base cloth and preparation method thereof