Emulsifying method of polyurethane micro-powder, polyurethane micro-powder emulsion, leather mending agent and application thereof

Abstract

The invention discloses an emulsifying method of polyurethane micro-powder, a polyurethane micro-powder emulsion, a leather mending agent and application of the leather mending agent, and the emulsifying method comprises the following steps: mixing nonionic surfactants with different HLB values to obtain a compound emulsifier; adding the polyurethane micro-powder into the composite emulsifier to obtain a polyurethane micro-powder suspension; dropwise adding deionized water into the polyurethane micro-powder suspension; dropwise adding a curing agent into the polyurethane micro-powder suspension, adjusting the pH value of the system to 7.5-9, and stirring to obtain the polyurethane micro-powder emulsion; according to the invention, the problem that in the prior art, polyurethane micro-powder is difficult to form a stable body in a water phase or a solvent phase is solved; the technical problem that the application of the polyurethane micro-powder emulsion in leather finishing is limitedin the prior art is solved, the polyurethane micro-powder emulsion is formed and applied to the leather mending agent, the performance of the leather mending agent is improved, and meanwhile, if theleather mending agent containing the polyurethane micro-powder is applied to the grain surface of crust leather, the mending effect can be remarkably improved.

Description

technical field [0001] The invention relates to the technical fields of tanning chemistry and engineering, in particular to an emulsification method of polyurethane micropowder, polyurethane micropowder emulsion, leather repairing agent and application thereof. Background technique [0002] Raw hides commonly used in tanning are mainly livestock hides, mostly cowhide, sheepskin, and pigskin. During the growth period of animals, the storage period of raw hides, and the processing of raw hides (or wet blue leather), it is inevitable that the grain surface will be damaged to varying degrees. The damage will affect the appearance of leather and reduce the value of leather. In order to make up for grain defects of crust leather, correct the grain surface defects of crust leather, and improve the utilization rate of leather, leather repair agents are usually used to repair the damaged parts of the grain surface of crust leather. Leather repair agents are composed of polymers, fill...

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present application solves the problem that the polyurethane micropowder in the prior art is difficult to form a stable body in the water phase or solvent phase by providing an emulsification method of polyurethane micropowder, polyurethane micropowder emulsion, leather repair agent and its application, which limits its application in leather. The technical problem in the application of finishing has realized the improvement of the performance of the leather repair agent by forming a polyurethane micropowder emulsion and applying it to the leather repair agent; at the same time, if the leather repair agent containing polyurethane micropowder is coated on the leather Grain surface, can significantly improve the effect of repairing wounds