Nano-Sio2 Application in the Manufacturing Technology of Elastic Skins

Abstract

The influence of ionized nano-SiO 2 content in the filling composition on the physico-chemical and technological properties of elastic skin was investigated. In this work, a semifinished product of chrome tanning made of 1.7 mm thick beef, nano-SiO 2 A-300, acrylic dispersion of RétanalRCN-40, a TrupolDL grasing material, P-11 gelatin, TrupotanG dispersant, quebracho extract and alumina galoon were used. In this case, methods of laser granulometry, infrared spectroscopy and a complex of physico-chemical research were applied.The inadequate influence of the concentration of modified nano-SiO 2 on the physical and chemical properties of leather semi-finished products has been established. In this case, an increase in relative elongation at a stress of 10 MPa and a decrease in the stiffness of the skin compared to the skin produced by the current technology were achieved. The study of the colloid-chemical properties of the filling dispersion in the interaction of nano-silica with auxiliary reagents shows a decrease in the particle size with an increase in polydispersity, respectively, by 2.0-2.7 and 1.5-1.9 times, a negative potential by 5.0-5.9 times, indicating the dispersant effect of the TrupolDL greasing material and the acrylic dispersion of RetanalRCN-40 on the nanosilver-containing composition.The analysis of the IR spectra of the products of the interaction of nano-SiO 2 with chrome gelatin, as a semifinished product, according to the spread of the Amid A band and the long-wave shift of the Amid 1 and Amid 2 bands, may indicate the interaction of pre-ionized nano-SiO 2 with the collagen core groups. It was established that nano-SiO 2 in the range of 1-2% of the mass of the half-finished product when it is filled gives the opportunity to get a skin of increased volume output and porosity and reduced rigidity compared to the skin obtained by the current technology, respectively 13-14 and 24-33%.The results of the conducted research indicate the possibility of effective use of nanoclay in the composition of the filling composition as an environmentally friendly and import-replacement reagent in the development of technologies for the production of elastic skins.