Technologies and Engineering

Investigation of the influence of liquid finishing processes on properties of natural leather

Purpose. 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. Methodology. 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 multicriteria 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 syntan-neutralizater Politan BN – during neutralization, syntan Retanal LMV – at retanning-filling

liquid finishing, chemical materials for neutralization, retanning-filling, leather semifinished products, leather