Aqueous polyurethane hot coating sol for case-bag artificial leather and preparation method thereof

Abstract

The invention relates to waterborne polyurethane thermosol for coating used for artificial leather of bags and a preparation method thereof. The polyurethane thermosol for coating made by the method is mainly used for bonding of fabric and synthesized artificial leather, characterized in that Diisocyanate and ester compound can be mixed to make prepolymer, the terminal group of which is -NCO, andthen hydrophilic monomer and 1,4-butanediol are added to do chain extending reaction. In the end after amine being used for adjusting the pH value to neutrality, deionized water is added and stirred.The waterborne polyurethane thermosol for coating is obtained. The adhesion strength of the thermosol is higher than that of solvent type PU adhesive. The thermosol can stand strong intensity. The bonding fabric is soft. The rigidity is in accordance with the technical demands for various artificial leather of bags and the performance. The invention has another characteristic, which is no volatilization of poisonous solvent when the invention is sprayed, scraped and solidified, and completely accords with the environmental and technical demands for chemical addition.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly water-based polyurethane hot-melt coating adhesive for artificial leather of bags. The hot-melt coating adhesive is mainly used for the bonding of textile fabrics and artificial leather materials. It belongs to the technical field of chemical additives. Background technique [0002] Before the present invention was made, the hot-melt coating glue currently used for luggage artificial leather was solvent-based PU glue. It mainly has the following disadvantages: as the production cost is relatively high, and it contains a large amount of toxic solvents such as toluene and dimethylformamide, the large amount of solvent it discharges during use seriously pollutes the environment. As countries around the world pay more and more attention to environmental protection requirements, and environmental protection regulations become increasingly stringent, highly polluting solvent products ...

AI Technical Summary

Problems solved by technology

It mainly has the following disadvantages: as the production cost is relatively high, and it contains a large amount of toxic solvents such as toluene and dimethylformamide, a large amount of solvents discharged during use seriously pollute the environment

[0003] However, the water-based polyurethane prepared by the traditional method has low adhesion fastness, and there are few commercialized water-based polyurethane hot melts.