Leather adhesive and preparation method thereof

Abstract

The invention discloses a leather adhesive which is prepared from the following raw materials in parts by mass: 30-66 parts of polyurethane prepolymer prepared by reaction between isophorone diisocyanate and poly-adipic acid-1,4-butanediol ester diol, 10-20 parts of neopentyl glycol, 5-15 parts of scrap rubber nano micropowder, 3-15 parts of 2,2-dimethylolpropionic acid, 20-50 parts of deionized water and 5-12 parts of carboxyl butadiene styrene rubber. The leather adhesive has the advantages of high solid content, high emulsion adhesive power, high binding strength and favorable film-forming property. The adhesive film formed by the leather adhesive has the characteristics of scratch resistance, high toughness, simple preparation method and the like.

Description

technical field [0001] The invention relates to a leather adhesive and a preparation method thereof, belonging to the technical field of chemical material preparation. Background technique [0002] With the development of technology, leather products have achieved diversified production and enriched people's lives. In the process of leather product processing, the bonding process of leather is an important process, and the leather adhesive affects the quality of leather products. [0003] Commonly used leather adhesives are polyurethane adhesives. Polyurethane adhesives refer to adhesives containing carbamate groups (-NHCOO-) or isocyanate groups (-NCO) in the molecular chain. At present, there are two types of polyurethane adhesives: solvent-based and water-based. Water-based polyurethane adhesives have the characteristics of low VOC content, low or no environmental pollution, and non-combustibility. Solvent-based polyurethane adhesives need to use organic solvents in th...

AI Technical Summary

Problems solved by technology

Water-based polyurethane needs to have a certain water solubility to ensure the stability of its emulsion, and because water-based polyurethane contains water-based groups, it has poor water resistance. It is used for leather bonding, and there is still insufficient bonding strength. When leather When the product encounters a humid environment with a high moisture content, it is prone to cracking at the joint or separation of the adhesive from the leather; moreover, the film formed by the adhesive is not strong enough, and when external forces act, such as scratching, rubbing When kneading, pulling, etc. act on the surface of the film or the upper and lower leather surfaces connected by the film, it is easy to cause the film to be misaligned or separated from the leather because the film is too hard and brittle or the internal bonding of the film is insufficient.