The paper studies the questions of the use of antimicrobial products (biocides) which can increase resistance of textile materials to the action of microorganisms and confer antimicrobial properties. Antimicrobial textile materials have broad opportunities of use both for daily and technical purposes. Hence, the development of efficient products for rendering textiles antimicrobial and enhancing their biostability against widespread microorganisms is relevant. The objective of the conducted research was chemical modification of polyamide textile materials with biocides and evaluation of antimicrobial properties of the resulting materials. Textile polycaproamide yarns and nonwoven materials were selected as the research object. During the experiment, the test portions under study were treated with biocides: nitrofuryl-acrolein, chloramine B, and catamine AB. Then, the direct action of the test portions on live cells growing on the nutrient medium was evaluated. Antimicrobial activity was identified according to the area of sterile zones which were formed around test portions. The research results have shown that the greatest antimicrobial action was observed in test portions treated with nitrofuryl-acrolein (NFA) and catamine AB. It has been shown that antibacterial action (bacterial growth inhibition zone) of yarns chemically modified with NFA amounts to: 14,3 mm when acting on the Erwinia herbicola bacteria, while it is 24,1 mm when acting on the Bacillus mesentericus bacteria. NFA-containing nonwoven polyamide materials had the diameter of sterile zones ranging from 21,4 to 24,9 mm with gram-negative bacteria, and from 32,3 to 36,4 mm – with the gram-positive ones (under the action of the 250 g/m² surface density material). It has also been found out that the said materials feature fungicidal action - after two days of exposure to the standard set of microscopic fungi, these fabrics had the fungicidal action zone diameter equal to 39,0 mm; in 8 days, the diameter of the zone was 2 times smaller; however, asporogenous mycelium was observed around the test portions, which gives evidence about fungistatic action of these materials. In the work, chemical modification of polycaproamide yarns and nonwoven materials with nitrofuryl-acrolein (NFA) has been performed. The research results have shown that both yarns and nonwoven materials made of polycaproamide containing NFA have antimicrobial activity both against bacterial cultures, and against microscopic fungi.

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