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Preparation of polydopamine-induced nanosilver-modified polypropylene meltblown nonwoven fabric and study on its antibacterial properties
Journal of Silk ; 59(5):20-27, 2022.
Article in Chinese | Scopus | ID: covidwho-1934318
ABSTRACT
Polypropylene (PP) nonwoven fabric has good physical and mechanical properties, and the production process is simple and cost is low, so it is widely used in the fields of adsorption and filtration, medical and health care. After the outbreak of COVID-19 pandemic, the market demand for PP nonwovens for medical and health care, such as masks and protective clothing has surged. Nanosilver, with high efficiency and broad-spectrum antibacterial activity, has potential application prospects in the new generation of medical nonwoven materials. However, due to the undiversified macromolecular structure of polypropylene and the lack of polar functional groups on the surface, it is not easy for inorganic antimicrobial agents to hind to PP nonwoven substrates, thus limiting its application and development to a certain extent. Therefore, it is of great practical significance to research and develop PP nonwoven fabric with antibacterial and antiviral properties to achieve long-lasting antibacterial effects. Surface modification methods such as radiation grafting, plasma treatment and chemical etching are commonly used for nonwoven fabric to improve the binding properties of fabrics with antimicrobial agents, but these methods involve harsh treatment conditions and complicated preparation processes. Therefore, this study intends to develop a simple nonwoven modification pathway to enhance the surface binding of inorganic antimicrobial agents to fabrics and achieve sustainability of the antimicrobial effect of PP nonwoven fabric. Dopamine is a low-molecular-weight catecholamine that mimics an adhesion protein and can polymerize spontaneously on various organic-inorganic surfaces to form uniform polydopamine (PDA) films under mild conditions. In addition, the phenolic hydroxyl groups in PDA have redox activity and thus can be used as metal reducing agents. In this paper, inspired by mussel adhesion proteins, PDA coatings were deposited on the surface of PP nonwovens by impregnation using nonwovens with different structures as substrates, and the optimal process conditions for dopamine impregnation were optimally selected using orthogonal tests. Further, nanosilver was generated in situ on the modified PP nonwoven surface by chemical plating method, and the antibacterial PP nonwoven fabric was characterized using FTIR , XRD, SEM, and pore testing. The results showed that the best film formation and coating effect of PDA was achieved when the dopamine concentration was 4 g/L, the pH of the buffer solution was 8.5, and the impregnation time was 24 h. When the amount of PVP was small, irregular silver nanoparticles were easily generated on the fabric surface, and the appropriate amount of PVP could effectively prevent the agglomeration of Ag nanoparticles;when mPVp∗mAKN03 = 11, spherical Ag with narrow particle size distribution range and good dispersion was obtained, the antibacterial performance was tested using agar plate diffusion method, and the results showed that 25 g/nr sample fabric after 30 times of water washing. The antibacterial activity of the sample was 74. 22% against influenza A ( HI N1) virus. In this study, an effective antibacterial and potentially antiviral PP nonwoven fabric was prepared based on the surface modification of mussel mimicry, which expands its application in the medical and health care field. © 2022 China Silk Association. All rights reserved.
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Full text: Available Collection: Databases of international organizations Database: Scopus Language: Chinese Journal: Journal of Silk Year: 2022 Document Type: Article

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Full text: Available Collection: Databases of international organizations Database: Scopus Language: Chinese Journal: Journal of Silk Year: 2022 Document Type: Article