Abstract
The aim of the work is studying the plasticization process of semi-finished chrome tanning from hides of cattle for the production of elastic leather materials. The process of influence of biologically catalytic modifiers on the elastic properties of the leather semi-finished chrome tiling is investigated. The technological parameters of the process of plasticization-filling of leather semi-finished products are determined. The developed plasticisation process of leather semi-finished products using biocatalytic modifier 3 and aerosol A-300 provides the formation of natural leather materials with high elastic-plastic properties while saving chemical materials by 20–25 %. The resulting full-fledged leather material according to the complex of properties meets the requirements for elastic leather materials for garments according to DSTU 3115-95, the interstate standard for leather for the top of shoes "GOST 939-88" and the requirements of the international standard of quality management systems "ISO 9001:2008". Thus, the technology of plasticization-filling of leather semi-finished product was developed, which allows to increase the yield of leather material to 6.7 % compared with the existing technology.
Highlights
Modern technologies for the processing of leather raw materials into highly elastic leather materials must meet the requirements for material and energy consumption, reduce the cost of production and environmental safety of production
It is shown that when the biocatalytic modifier is effectively used, value of the stiffness index of the semi-finished leather is reduced twice as compared with the semi-finished product, elaborated by the existing technology while maintaining its mechanical strength
It is established that the critical temperature of the plasticization process using biocatalytic modifiers should be done at a temperature of 25–30 oC below the hydrolytic stability of the leather semi-finished product
Summary
Modern technologies for the processing of leather raw materials into highly elastic leather materials must meet the requirements for material and energy consumption, reduce the cost of production and environmental safety of production In this respect, the improvement of existing technologies and the development of new ones makes it possible to use shortages of natural raw materials more efficiently, to replace imported high-value reagents with domestic scientifically sound and environmentally friendly. Specialists from Lanxess recommend this reagent as a universal plasticizer for clothing, footwear, furniture, leather haberdashery and automotive skins In this case, the stability of natural material to the effect of light and heat, high intensity of coloration during dyeing, as well as biodegradation of the developed plasticizer is determined
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