Carboxymethyl chitosan (CMCTS) and silver nanoparticles (Ag NPs) were successfully linked onto a cotton fabric surface through a simple mist modification process. The CMCTS binder was covalently linked to the cotton fabric via esterification and the Ag NPs were tightly adhered to the fiber surface by coordination bonds with the amine groups of CMCTS. As a result, the coating of Ag NPs on the cotton fabric showed excellent antibacterial properties and laundering durability. After 50 consecutive laundering cycles, the bacterial reduction rates (BR) against both S. aureus and E. coli remained over 95%. It has potential applications in a wide variety of fields such as sportswear, socks, and medical textile.Copyright © 2017 Elsevier Ltd. All rights reserved.

为研究光敏剂在纺织材料上负载的抗菌效果和其在纺织品改性中应用的可能性,通过文献调研的方式对光动力抗菌的研究背景、光敏剂的种类、抗菌纺织品的应用情况、光敏剂常用的负载形式进行归纳整理。研究表明:作为一种能高效杀菌的新型抗菌材料,光动力抗菌纺织品具有良好的发展前景;通过化学共价键合光敏剂的改进负载方法能够解决常见负载方式中出现的结合牢度差、重复利用性不佳等问题,进一步拓宽抗菌材料的研发途径;目前光敏剂对其光敏抗菌性能均未能做到精准调控,今后的研究应当通过控制光敏剂的种类及光敏剂浓度等因素实现对光敏抗菌性能的把控。

In order to study the antibacterial effect of photosensitizers loaded on textile materials and the possibility of its application for textile modifications, the research background of photodynamic antibacterial, types of photosensitizers, current applications of antibacterial textiles, and photosensitizers were systematically reviewed. The commonly used loading forms of the drug are examined, and the conclusions and future prospects are summarized. The review indicates that photodynamic antibacterial textiles are a new type of antibacterial material that can be effectively sterilized and has a good development prospect. The improved loading method through chemical covalent bonding of photosensitizers can solve the problems of poor binding fastness and poor reusability associated with the commonly used loading methods, and can further broaden the research and development path of antibacterial materials. At the same time, it is realized that the current photosensitizers have not been able to control accurately their photosensitizing antibacterial properties. Future research should control the photosensitive antibacterial properties by controlling the types of photosensitizers and the concentration of photosensitizers.

The antibacterial activity of naturally colored cottons (NCCs) is evaluated. Compared to the conventional white cotton, brown NCC was found to exhibit excellent antibacterial activity with a reduction rate of 89.1% and 96.7%, when in contact with two species of bacteria, Staphylococcus aureus and Klebsiella pneumoniae, respectively, while the antibacterial effect of green NCC was faint. To investigate the antibacterial mechanism of NCCs, pigments have been extracted from NCC fibers for further determination of their antibacterial activity using the disk diffusion method, and the chemical nature of extracted pigments was also analyzed. The results are as follows: the pigment from brown cotton fibers showed significant inhibition against the two challenge bacteria, while the resistance capacity of the pigment from green cotton fiber was insignificant, indicating that the antibacterial efficacy of NCC fibers was highly related to the chemical nature of the pigment. Diagnostic results indicated that the pigment from brown cotton belonged to condensed tannins, and the pigment from green cotton fiber was identified as flavonoids. The effect of high-temperature treatment on antibacterial activity of the pigment extracted from brown cotton was also examined. It showed that the general textile high-temperature curing conditions decrease its antibacterial activity, but the antibacterial activity still has a satisfactory retention, indicating a durable natural antibacterial performance of brown NCC to the high-temperature curing technology.

为促进天然香蕉茎秆纤维在纺织服装领域的应用,采用半精纺纺纱工艺,以香蕉茎秆纤维(BF)、优可丝安泰贝抗菌纤维(ATB)和稀土抑菌再生纤维素纤维(XT)为原料,制备了混纺比为50/50、65/35、70/30、85/15的8种BF/抗菌纤维混纺纱和1种BF纯纺纱,表征了纱线的线密度和捻度,探究了混纺比例与纱线力学性能、质量指标、抗菌性能的关系。结果表明,9种纱线实测的线密度和捻度与设计值存在偏差,但其偏差在允差范围内;ATB和XT的加入提高了BF纯纺纱的力学性能与抗菌性能,改善了BF纯纺纱的条干均匀度、毛羽指数、棉结、粗节、细节等质量指标,且香蕉/抗菌纤维混纺纱强度高、毛羽少、手感柔软,适宜开发各类机织和针织面料。

<p id="p00010"><strong>Objective</strong> With the proposal of the "double carbon economy" policy, green environmental protection and sustainable development become the direction of future textile development, and Xitu it is of great significance to develop new natural plant fibers and promote the application of natural banana stem fibers in the field of textile and clothing.</p><p id="p00015"><strong>Method</strong> The semi-worsted spinning process was adopted with banana stem fiber (BF), EcoCosy^R antibacterial fibers (ATB) and rare earth antibacterial regenerated cellulose fiber (XT) as raw materials. Eight types of BF/antibacterial fibers (ATB and XT) blended yarns, with blending ratio of 50/50, 65/35, 70/30 and 85/15, and one BF pure spun yarn were prepared. The yarn density and twist were characterized, and the relationship between the blending ratio and mechanical properties, quality index and antibacterial properties of the yarn was investigated.</p><p id="p00020"><strong>Results</strong> The measured linear density and twist of the 9 types of yarns were different from the designed values, but the deviation was within the tolerance range. The mechanical properties of BF pure spinning are poor, with the breaking strength being (7.12±1.45) cN/tex, the elongation at break (2.56±0.43)%, and the initial modulus (247.11±81.07) cN/tex. The mechanical properties of yarns were improved with the addition of ATB and XT content. The elongation at break of BF/ATB(50/50) and BF/XT(50/50) yarns was the highest, which was (4.19±0.46)% and (4.74±0.41)%. The breaking strength of BF/ATB(85/15) and BF/XT(70/30) yarns is the highest, and they were (9.33±1.45) cN/tex and (8.97±1.28) cN/tex respectively. With the increase of the content of ATB and XT, the defects such as knots, thick knots and detail of the yarn were greatly reduced, and the evenness of yarn strip and hairiness index were improved. The yarn unevenness was decreased from 21.83% to 13.91% and 14.8% respectively, and the hair index was decreased from 6.72 mm to 5.85 mm and 5.27 mm respectively, decreasing by 13% and 22%. The bacteriostatic rate of BF pure spinning against <i>Escherichia coli</i> was 65.47%, and the bacteriostatic rate of yarn increased with the increase of ATB and XT content. When the ratio of BF/ATB and BF/XT blended yarn was 50/50, the inhibition rate of <i>Escherichia coli</i> reached the maximum, which were 88.79% and 84.76% respectively, while for <i>Staphylococcus aureus</i>, the content of ATB and XT had little effect on the inhibition rate, and the inhibition rate of BF pure spun yarn and blended yarn could reach more than 95%.</p><p id="p00025"><strong>Conclusion</strong> The addition of ATB and XT improved the mechanical properties and antibacterial properties of BF pure spinning. In addition, it also improves the quality indexes of BF pure spun yarn, such as strip evenness, hairiness index, knots, thick knots and details, making the blended yarn have higher breaking strength, excellent antibacterial property. It is of great significance for its application and development in clothing, and is suitable for the development of leisure woven shirt fabric and knitted fabric.</p>