Abstract

In this paper, the waterproof and oilproof properties of different parts of natural cowhide were experimentally tested, and regression analysis was carried out on the data of surface water and oil contact angles with time. The pore distribution parameters were obtained by SEM image measurement. The static contact angle, droplet absorption time and droplet diffusion area were used as reference sequences, and pore distribution parameters were used as comparison sequences for Grey Relation Analysis. Studies have found that cowhide has good oilproof performance and poor waterproof performance, and the back is more likely to be penetrated by water and oil droplets. The static water contact angle of each part of the cowhide is greater than the oil contact angle. There is a significant linear correlation between water contact angle and time at different parts. There is a significant cube regression correlation between the contact angle of oil and time at different parts. The degree of influence of surface pore distribution on the static water contact angle of leather surface: pore area proportion> pore density> average pore area; The degree of influence on the static oil contact angle and oil diffusion area of the leather surface: pore density> pore area proportion> average pore area; The degree of influence on the water and oil absorption time: average pore area> pore area proportion> pore density; The degree of influence on water diffusion area is: pore area proportion> average pore area> pore density.