Oral
Abstract
Research summary supplied by the authors
In order to reduce the apparent density of the finished leather and the amount of fat-liquor during the production of leather-making, an polymer auxiliary with silicon is synthesized by radical co-polymerization of acrylic acid, meth-acrylic acid and polyvinyl silicone oil,etc. The polymers were applied to the re-tanning process of sheepskin. Comparing the viscosity and applied properties of the polymer auxiliary with silicon, the mol ratio of acrylic acid, meth-acrylic acid used was confirmed to be 0.5:0.2, the consumption of polyvinyl silicone oil, ammonium persulfate, the reactive temperature and time is 5%, 1.5%, 80-85°C, 120-180min, respectively. Infrared spectroscopy shows that the structure of the polymer auxiliary contains -Si-O- bond. The thickening rate, softness of the treated leather is 23.1%, 6.0 and the consumption of fat-liquoring agent after re-tanning can be reduced to 4%~8% when the optimum consumption of the an polymer auxiliary is 8%~10%, the retreated leather is fine, soft, hydrophobic and the apparent density is 0.457g/cm3.