Preparation method and application of high-performance water-based polyurethane adhesive for synthetic leather

Abstract

The invention provides a preparation method and application of a high-performance water-based polyurethane adhesive for synthetic leather. The preparation method comprises the following steps: addingthe following components in parts by weight into a reaction kettle: 18-22 parts of mixed polymer diol, 9-11 parts of isophorone diisocyanate and 1-3 parts of triethylamine; adding the following components in parts by weight after reaction: 1.3-1.6 parts of dimethylolpropionic acid, 0.4-0.6 part of 1,4-butanediol and 1-3 parts of triethylamine; adding 3-5 parts of diethanol amine and water after reaction, and stirring to obtain polyhydroxyl-terminated to serve as a component A; and taking hexamethylene diisocyanate (HDI) trimer as a component B. According to the preparation method, a stepwise polymerization method and polyhydroxyl termination technology are adopted to prepare the polyhydroxyl-terminated water-based polyurethane to serve as the component A, and the HDI trimer is used as thecomponent B to prepare a dual-component water-based polyurethane adhesive which can be used for preparing high-performance water-based synthetic leather.

Description

technical field [0001] The invention relates to the technical field of synthetic leather, in particular to the preparation and application of a high-performance water-based polyurethane adhesive for synthetic leather. Background technique [0002] Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually non-woven fabric is used to simulate the mesh layer, and microporous polyurethane coating is used to simulate the grain layer. The front and back of the obtained synthetic leather are very similar to leather, and have a certain degree of air permeability, which is closer to natural leather than ordinary artificial leather. Widely used in making shoes, boots, bags and ball games. In 2014, the domestic consumption of synthetic leather was about 4.55 billion square meters, and its total production ranked first in the world. It is estimated that the average compound gro...

AI Technical Summary

Problems solved by technology

Among them, replacing solvent-based polyurethane with water-based polyurethane and producing water-based polyurethane synthetic leather is the main research and development direction, but water-based polyurethane has poor water resistance and hydrolysis resistance, resulting in poor performance of water-based polyurethane synthetic leather.

Especially for water-based polyurethane adhesives, it is difficult to implement dry and semi-dry pasting processes, and due to insufficient water resistance and hydrolysis resistance, the wet peel strength and hydrolytic peel strength are very low, which limits the application of water-based polyurethane synthetic leather