The invention belongs to the field of
leather tanning process and relates to a process for tanning and
softening sheepskin by a multi-carboxylic nano compound chrome tanning additive. In a traditional chrome tanning method, the use of various chemicals in picking and chrome tanning procedures causes damage to the
ecological environment. According to
leather tanning mechanisms and structural features of collagenous
fiber and the multi-carboxylic nano compound chrome tanning additive, the process used for
leather tanning and
skin softening is characterized in that the shrinkage temperature of blue wet leather can reach 105 DEG C, the grain side is flat and fine, and the requirements of goat
skin garment leather can be met; compared with the method that 8 percent of
chromium powder is adopted for conventional tanning
liquid waste,
liquid waste is characterized in that the content of Cr2O3 in the
liquid waste is reduced to 172 mg / L from 1,952 mg / L, and the content of
chromium in the liquid waste is reduced greatly; compared with the conventional chrome tanned leather, the chrome tanned leather treated through the process has the advantages that excellent effects to follow-up backwater,
neutralization, and control to
chromium pollution in dying and oiling liquid waste are achieved, the physical and mechanical performance of crust leather is similar, compact hand feeling is achieved, the filling performance and the softness are excellent, and the requirements of the goat
skin garment leather can be met.