TECHNOLOGY OF HYBRID MODIFICATION WITH HUMIC ACIDS OF BROWN COAL HYDROXYPROPYLMETHYL CELLULOSE FILMS

Abstract

The peculiarities of the technology of hybrid modification of lignite humic acids of biodegradable films based on hydroxypropylmethylcellulose are considered. As a result of the conducted research, hybrid biodegradable films with antibacterial properties were obtained for the first time. Hydroxypropylmethylcellulose of the Walocel brand was used for the production of biodegradable films, and citric acid (99.88%) according to GOST 3652 is used as a catalyst for crosslinking biodegradable polymer films. As part of the research, the hybrid structures of hydroxypropylmethylcellulose modified with different types of humic acids were actually determined by IR spectroscopy. As a result of the study, the regularities of changes in the time of appearance of mold of films within the framework of the technology of hybrid modification with lignite humic acids were established. It was also established that the technology of hybrid modification of hydroxypropylmethylcellulose films with humic acids of lignite and giving them antibacterial properties allows to preserve the properties of biodegradation. It was established that the technology of hybrid modification of hydroxypropylmethylcellulose with lignite humic acids of biodegradable hydroxypropylmethylcellulose films with different types of humic acids, while giving them antibacterial properties, allows the biodegradation of films based on them to be at least 91% within 6 months with an optimal humic acid content of 10% by mass. Biodegradable films with bactericidal properties based on hydroxypropylmethylcellulose, obtained according to the technology of hybrid modification with humic acids of lignite, in terms of their operational characteristics, are superior to known similar biodegradable films based on natural biopolymers and can be recommended for the manufacture of packaging of dry food products (bread, cereals, nuts, etc.) with an extended storage period.