关键词: 粘胶纤维, HKUST-1, 羧甲基化, 抗菌, 耐水洗

Abstract: As living standards continue to improve, people are placing increasing emphasis on personal hygiene and protection, gradually developing new types of green, healthy, and safe antibacterial textiles to replace traditional ones. Viscose fibers, as the most widely produced regenerated cellulose fibers, are widely used in textiles, medical applications, and other fields. During daily use, due to close contact with human skin and the external environment, bacteria, fungi and other microorganisms are prone to proliferate on textile surfaces. This not only poses a threat to human health but also affects the lifespan of the textiles. Combining viscose fibers with antibacterial agents is an important direction to develop new antibacterial textiles. Metal-organic frameworks (MOFs) are multifunctional crystalline materials composed of metal ions and organic ligands. They have the advantages of high specific surface area, high porosity, structural diversity, and ease of adjustment and modification, making them a focal area of research in recent years. However, the majority of MOFs exist in powder form, which limits their recovery, processing, and molding. Choosing natural or modified flexible fibers as ideal substrates for depositing MOFs can, on the one hand, endow the fiber substrates with many new functions, realizing high-value utilization of the fibers. On the other hand, fiber substrates can provide a wider utilization space for MOFs, achieving multi-level development and utilization of MOFs. Therefore, combining HKUST-1 materials with binder fibers holds significant practical importance. 
Under alkaline conditions, viscose fibers were carboxymethylated using chloroacetic acid to prepare carboxymethylated viscose fibers. Based on this, HKUST-1/viscose composite fibers were prepared through metal-organic coordination. The effects of factors such as the mass fraction of NaOH, the mass concentration of chloroacetic acid, etherification time, and etherification temperature on the Cu2+ adsorption capacity and mechanical properties of the bonded fibers were investigated. The apparent morphology and chemical structure of the adhesive fibers were analyzed by SEM, XRD, and XPS. Additionally, the antibacterial properties and wash durability of the HKUST-1/viscose composite fibers were tested. 
The carboxymethylation process for viscose fibers is as follows: 0.5 g of viscose fibers, a sodium hydroxide mass fraction of 5%, a chloroacetic acid mass concentration of 20 g/L, etherification time of 45 minutes, and etherification temperature of 85 °C. Under these conditions, the prepared viscose fibers have a higher carboxyl group content, resulting in better Cu2+ adsorption performance, which facilitates the loading of HKUST-1 onto the fiber surface. After carboxymethylation treatment, the mechanical properties are slightly improved. SEM images show that under room temperature ultrasonic conditions, crystalline particles are successfully loaded onto the surface of the bonded fibers. Further confirmation through XRD and XPS reveals that the crystalline particles are HKUST-1. Antibacterial and wash durability tests indicate that HKUST-1/viscose composite fibers have good antibacterial properties. When the concentration of copper ammonia solution reaches 0.40 mmol/L, the antibacterial rates against Escherichia coli and Staphylococcus aureus are 99.01% and 99.79%, respectively. After 50 cycles of standard washing, the antibacterial rates remain above 90%. 

Key words: viscose fiber, HKUST-1, carboxymethylation, antibacterial, washable