Development of a polymer composition to protect textile material from bio-damage

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Introduction
Typical requirements for standard employee's work wear are usually reduced to ensuring its protective functions and practicality of wear. In recent years, the question has arisen of the need to create completely new materials necessary for special clothing. Certain substances and finishing methods are used to give certain properties.
Due to the huge material losses caused by the action of microorganisms, at the moment, more attention is paid to the biosecurity of various materials, including textiles, which are damaged during their production, storage and operation [1].

Materials and research methods
Laboratory studies were conducted using physical, mechanical, and microbiological testing methods.
The main objects of research in this work were: -fabric Premier Standard 210 (article 81423); -chemical compounds: polyvinyl alcohol, maleic acid, silver ion solution. Microbiological studies were performed on untreated and treated samples of mixed fabric [3]. Aspergillus niger, Penicillium brevi and Trichoderma viride fungi were used as test cultures to test for fungal resistance.

Results and their discussion
The tissue samples under study were infected with a fungi suspension and transferred to Petri dishes. Next, Petri dishes were placed in a desiccator with water. The desiccator with water was used to provide the necessary humidity. Incubation was carried out for 28 days at a temperature of 30℃ [4] As a result, after 28 days, the growth of Penicillium brevi and Trichoderma viride fungi was detected on the untreated tissue sample. The intensity of fungal germination was 5 points (noticeably extensive tissue damage by fungi). The growth rate of the Aspergillus niger fungus in the control sample was estimated at 3 points (noticeable growth, but not over the entire surface of infection).
The growth of Penicillium brevi and Aspergillus niger fungi was observed on the fabric samples treated with this composition, but the intensity of their germination was insignificant, and the growth of Trichoderma viride was suppressed (Fig.1).  The contamination of fabric samples was also investigated. For verification, swabs were taken from fabric samples. Swabs were taken using sterile moistened cotton swabs. Before seeding the washings, 5 ml of an isotonic sodium chloride solution was added to the swab. The tampon was washed thoroughly, after which 0.1 ml of flushing fluid was placed in a Petri dish with nutrient medium. The cups were placed in a thermostat at 30°C. A preliminary count of the grown colonies was made after 48 hours, the final -after 72 hours [5].

Untreated fabric samples
As a result of research, it was found that the growth of bacteria in cups containing flushes from untreated tissue samples significantly increased. On the surface of untreated mixed fabric (25 cm 2 ) contains about 200 cells. In the treated fabric samples, microbial growth was absent (Fig. 2). Quality assessment of finished fabrics was carried out on the physico-mechanical properties such as crease-resistance, tensile characteristics and abrasion resistance as well as organoleptically.
As a result of the assessment on organoleptic indicators, it was found that the fabric becomes smooth and easily slips off the hands.

Summary
The study revealed the most optimal concentrations of the composition components: PVA -8 g/l, SI -50 ml/l, MA -5 g/l.
The results of the study revealed the acquired antimicrobial properties of tissue treated with an dressing composition based on polyvinyl alcohol, maleic acid and a solution of silver ions. The acquired properties have shown their resistance to the development of mold fungi on their surface, as well as to the resistance to harmful effects of microorganisms in operating conditions.