Structural Color Modified Fabrics with Excellent Antibacterial Property

With the improvement of living standards, people are paying more and more attention to health problems. The antibacterial function of fabrics is therefore of great importance. The structural color(photonic crystal), which has been widely investigated and applied on fabric dyeing, contains a large number of hollow microstructure and functional groups, and is easy to be modified and functionalized. Therefore, an innovative way of endowing structural color dye on fabrics with antibacterial property was presented in this paper. The latex spheres and zinc pyrrolidone were co-assembled on polydopamine modified fabrics, antibacterial ion zinc pyrrolidone was therefore loaded into the pores of structural color dye, and brilliant antibacterial fabrics were successfully achieved. The existence of zinc pyrrolidone had little influence on the color saturation of brilliant structural color and meanwhile ensured the structural color dye excellent antibacterial effect. The antibacterial reduction rate of the antibacterial fabric reached 99.99%. Owing to the addition of polyurethane(PUA) coating on the surface of structural color, the fabric modified by the antibacterial structural color dye also presented good washing resistance, which showed great application possibility in functional textile and antibacterial fields.

Development of an Antibacterial Finishing Progress for Medical Compression Hosiery

Medical compression hosiery based on polyurethane and polyamide covered yarns was treated with two antibacterial agents,SCJ-891 and SCJ-963, to investigate their antimicrobial performance. Various parameters of finishing process, including concentration,temperature,pH and liquor ratio,were studied in the single factor and orthogonal experiments. ANOVA analysis indicated that all of these four variables played important roles in antimicrobial efficacy. Different combinations of finishing parameters gave different antimicrobial efficacies against both gram positive bacteria Staphylococcus aureus( S. aureus) and gram negative bacteria Escherichia coli( E. coli). SCJ-963 treated fabric had better antibacterial efficacy when compared with that of SCJ-963 treated yarn. Meanwhile both SCJ-963 treated fabric and yarn showed better antibacterial efficacy when compared with SCJ-891 treated fabric and yarn. The optimized parameters for SCJ-891 treated fabric against S. aureus( A: 86%) were a liquor ratio of 1: 20,a concentration of 10% of weight of fabric,pH of 4. 5 and a temperature of 99℃; the optimized parameters for SCJ-963 treated fabric against S. aureus( A: 83%) were a liquor ratio of 1: 15,a concentration of 10% of weight of fabric, a pH of 5 and a temperature of 99℃. Furthermore, two kinds of antimicrobial finishing of the fabric had good resistance to 50 times washing. This study concluded that SCJ-891 and SCJ-963 were compatible to be used in medical compression hosiery.

Antibacterial Cellulose Coated with N-halamine by Pad-Cure Process

In order to improve the antibacterial property of cellulose,a new N-halamine antibacterial material precursor was synthesized.1,2,3,4-Butanetetracarboxylic acid( BTCA) was used to attach the N-halamine precursor onto cotton fabric as the cross-linking agent. The synthesized compound was characterized by1 H nuclear magnetic resonance(1H NMR). The cotton fabric treated with Nhalamine precursor was characterized by Fourier transform infrared spectroscopy( FT-IR) and scanning electron microscopy( SEM).The antimicrobial efficacy, washing durability and UVA light stability were investigated. The cotton fabric treated with the Nhalamine precursor could be rendered biocidal after exposure to dilute household bleach. The chlorinated cotton fabric shows great antimicrobial efficacy,100% of Staphylococcus aureus( S. aureus)with 1.00 ×10~7 CFU and 99. 998% of Escherichia coli (E. coli)O157∶H7 with 2. 20 × 10~7 CFU can be inactivated with 30 min of contact. Washing durability tests indicate that over 55% of the chlorine can be regained upon rechlorination after 50 washing cycles,and UVA light stability tests show that over 62% of the chlorine can be regenerated after irradiation of 12 h.

Nano-copper ions assembled cellulose-based composite with antibacterial activity for biodegradable personal protective mask

The current SARS-CoV-2 pandemic has resulted in the widespread use of personal protective equipment,particularly face masks.However,the use of commercial disposable face masks puts great pressure on the environment.In this study,nano-copper ions assembled cotton fabric used in face masks to impart antibacterial activity has been discussed.To produce the nanocomposite,the cotton fabric was modified by sodium chloroacetate after its mercerization,and assembled with bactericidal nano-copper ions(about 10.61 mg·g^(–1))through electrostatic adsorption.It demonstrated excellent antibacterial activity against Staphylococcus aureus and Escherichia coli because the gaps between fibers in the cotton fabric allow the nano-copper ions to be fully released.Moreover,the antibacterial efficiency was maintained even after 50 washing cycles.Furthermore,the face mask constructed with this novel nanocomposite upper layer exhibited a high particle filtration efficiency(96.08%±0.91%)without compromising the air permeability(28.9 min·L^(–1)).This green,economical,facile,and scalable process of depositing nano-copper ions onto modified cotton fibric has great potential to reduce disease transmission,resource consumption,and environmental impact of waste,while also expanding the range of protective fabrics.