Preparation method of synthetic leather and polyurethane composition used for synthetic leather

Abstract

The invention discloses a preparation method of synthetic leather. The preparation method of the synthetic leather comprises the following steps: firstly, impregnating a cloth base with a first polyurethane composition added with a pore-foaming agent; and followed by eluting the pore-foaming agent agglomerated on the cloth base with an eluent, and thus forming gaps in the cloth base agglomerated with a polyurethane layer, wherein the pore-foaming agent is dissolved in the first polyurethane composition and also dissolved in a high-molecular polymer of the eluent. In the preparation method of the synthetic leather, the pore-foaming agent is added in the first polyurethane composition impregnating the cloth base, at a later stage, the pore-foaming agent agglomerated on the cloth base is eluted, therefore, the gaps are formed in the cloth base after the pore-foaming agent is eluted, the gaps form a moisture permeable channel, and the high moisture permeability effect can be improved; and moreover, the eluting of the pore-foaming agent belongs to micro-particles, the cloth base and an overall connection face of polyurethane attached to the cloth base surface are not affected, and mechanical properties of the synthetic leather cannot be reduced.

Description

technical field [0001] The invention relates to the technical field of synthetic leather, in particular to a method for manufacturing synthetic leather and a polyurethane composition used for synthetic leather. Background technique [0002] Leather products are divided into natural and synthetic. Natural leather mainly comes from animals. Artificial synthetic leather mainly includes PVG leather, PU wet-laid leather and microfiber leather. With the rapid economic growth and the continuous improvement of people's living standards, leather demand is increasing. [0003] PVC leather has disadvantages such as relatively high hardness, poor elasticity, non-washable, non-environmental protection, airtightness, and plasticizers, which cannot meet people's higher environmental protection and health requirements for leather. Microfiber leather is in the research and development experiment stage. The price is relatively high, so the increasingly perfect PU wet-laid leather production ...

AI Technical Summary

Problems solved by technology

[0006] The second method is to drill holes in the synthetic leather for shoes to improve its moisture permeability. This method greatly reduces the mechanical properties of synthetic leather and increases the cost.

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