Effect of Carboxyl Content on the Performance of Carboxylated Graphene/Chitosan Leather Finishing Agent

Graphene oxide was modified with bromoacetic acid, and then carboxylated graphene was prepared, and its basic structure was characterized by infrared spectroscopy; then chitosan was used as a matrix, carboxylated graphene was used as a filler, and the solution blending method was used to prepare carboxylated graphene/chitosan composite leather finishing agent. The results of this study indicate that the content of carboxyl groups increased with the increase in the amount of bromoacetic acid, so was their stability. The crosslinking degree of carboxylated graphene/chitosan also increased with the increase of carboxyl content. The increase of the carboxyl content also improved the hydrophilicity and solvent resistance of the composite; the carboxylated graphene/chitosan composite with the carboxyl content of 6.48 mmol/L had the best physical and mechanical properties. At the same time, abrasion resistance can be increased to level 4, dry rub resistance to level 5, and wet rub resistance to level 4-5.