INVESTIGATION OF THE INFLUENCE OF LIQUID FINISHING PROCESSES ON PROPERTIES OF NATURAL LEATHER

Abstract

To improve the quality of natural leather for uppers shoes are investigated the influence of the  processes  of  liquid  finishing  (neutralization,  retanning-filling)  carried  out  using  a  series  of  modern chemical materials on its properties.  In order to achieve this purpose, the following methods had been used in the work: the typical  method  of  production  of  chrome  goat  leather  for  uppers  shoes,  with  adjusting  the  type  and  the consumption of chemical materials, methods of organoleptic evaluation, chemical and physical-mechanical analysis of leather, and statistical processing of experimental data. Results. In laboratory conditions, the influence of neutralization, retanning and fillings processes on the properties of natural goat leather for uppers shoes is studied. It is established that the best indexes of
straight  of  leather  overall  and  it  surface,  by  volume  yield  and  yield  of  area  are  provide  with  the  use  of preparation Politan BN based on aromatic compounds during neutralization and synthetic retanning agent (especially  syntan  Retanal  LMV  based  on  melamine)  during  retanning-filling.  After  neutralization  with sodium salts are increased elongation at break and the yield of thickness in the case of retanning-filling with the use of syntans Retanal LMV and Retanal RCN-40 based on acrylic-based polymer, and the absorption time of water drop during retanning-filling quebracho tannins and Retanal LMV. By the method of multi-criteria optimization, the most rational conditions of treatment are established. Scientific  novelty.  The  relationship  between  the  conditions  of  neutralization  processes,  retanning and  fillings  and  individual  indices  of  leather  quality:  strength,  elongation,  yields  in  thickness  and  area, volume yield, absorption time of water drop had been established. Practical value.  Based on the results of investigation the possibility of improvement of quality of chrome goat leather for uppers shoes is revealed by improving the liquid finishing processes with the use of modern chemical materials such as syntn-neutralizater Politan BN – during neutralization, syntan Retanal LMV – at retanning-filling.