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Subject: Textile and Apparel Designing × Author: Gupta, Vandana × End date: 2019 × Start date: 2013 × Type: Thesis ×
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    ThesisItemOpen Access
    UV protective and antibacterial finish on cotton using plant extracts
    (CCSHAU, 2016) Gupta, Vandana; Yadav, Nirmal
    The present study was planned to develop UV protective and antibacterial finish on cotton fabrics by using plant extracts. To achieve the objectives proposed in the research plan, two types of cotton fabric, namely, woven and knitted were selected in greige state. Enzymatic desizing and enzymatic scouring were performed on selected cotton fabrics for uniform application of finish. Three plants species, namely, Portulaca oleracea (Bichubutti), Syzygium cumini (L.) (Jamun) and Psidium guajava (L.) (Guava) were selected and subjected to soxhlet extraction by using methanol as solvent. Analysis of plant extract was done and Syzygium cumini was selected for application of finish on cotton fabrics as it exhibited highest properties i.e. 19.5% yield , four phytochemicals (tanin, flavonoids, saponin, phenols), 25.01 SPF and moderate antibacterial properties with zone of inhibition of 11 mm for Staphylococcus aureus and 12 mm for Bacillus subtilis, as compared to other two plant extracts. Optimization of standard variables was conducted on the basis of UV protective and antibacterial properties exhibited by treated fabrics. The application of finish was performed with paddry- cure process by using the standard conditions which were optimized i.e. concentration of Syzygium cumini (L.) leaves extract (11% for woven and knitted); material to liquor ratio (1:20 for woven and 1:15 for knitted); concentration of resin cross linking agent (60 g/l for woven and 40 g/l for knitted); concentration of magnesium chloride (10 g/l for woven and knitted ); pH (5.5 for woven and 5.0 for knitted) and treatment time (30 min for woven and knitted fabric). The antibacterial properties of finished cotton fabrics were 95.67% for (S. aureus) for cotton and 96.93% for knitted and 94.70% for (B. subtilis) for cotton and 97.00 % for knitted, the results exhibited remarkable per cent reduction in bacterial growth. The UPF value was found ‘excellent’ after the finishing treatment in both the finished fabrics (woven and knitted) hence showed excellent UV protective property. After subjecting the finished woven fabric to number of wash cycles (0,5,10,15 and 20) decrease in fabric count (0 to 5.78%), fabric weight (0.80 to 5.47%), fabric thickness (1.18 to 6.69%), bending length (1.29 to 6.14%), flexural rigidity (3.12 to 16.91%), crease recovery angle (1.34 to 8.25%) and tensile strength (0.87 to 8.57) was observed. Whereas, properties such as elongation (0.36 to 7.51%), moisture regain (2.67 to 7.61%) and air permeability (1.72 to 8.95%) exhibited gradual increase after each set of wash cycles. Knitted fabric exhibited similar trend i.e. gradual decrease in stitch density (0 to 6.26%), fabric bulk (2.62 to 5.24%), fabric weight (0.12 to 4.41%), fabric thickness (2.80 to 7.64 %), bursting strength (1.64 to 8.30%), crease recovery angle (4.36 to 14.47%), bending length (3.22 to 10.13 %) as well as flexural rigidity (6.14 to 23.30 %). The moisture regain (1.43 to 6.82 %) and air permeability (1.06 to 7.16%) showed gradual increase after subjecting to number of wash cycles. Consumers’ preferences regarding the developed finished fabrics showed acceptance of its use for apparel purpose being finished with UV protective and antibacterial finish