Aldehyde nucleophilic addition complexing antibacterial fibers as well as preparation method and application thereof

Abstract

The invention relates to the field of textiles, in particular to antibacterial fibers. The invention relates to a preparation method of aldehyde nucleophilic addition complexing antibacterial fibers.The method comprises the following steps of selecting to-be-modified fibers at least containing one aldehyde active group on a sugar unit as a raw material, carrying out a cross-linking reaction, andpadding the to-be-modified fibers in a solution of a cross-linking agent and a catalyst to obtain a modified fiber intermediate, wherein the cross-linking agent at least contains one aldehyde active group on the to-be-modified fibers and one complexing active group; performing washing with the cross-linking agent; and carrying out a complexation reaction to obtain the antibacterial fibers. According to the invention, an aldehyde addition reaction is adopted to crosslink the bifunctional crosslinking agent to the fibers, then antibacterial ions are complexed to form a covalent bond with higherbond energy, and the covalent bond cannot be broken due to common washing strength, so that the antibacterial ability of a product is durable, and can still reach the 3A-level standard after the product is washed for 50 times; and in addition, the processing technology is relatively simple, is easy to realize in industrial large-scale production, and has good technical feasibility and economic value.

Description

technical field [0001] The invention relates to the field of textiles, in particular to an antibacterial fiber. Background technique [0002] With the development of social economy and the improvement of people's living standards, people's requirements for textiles have risen from the basic requirements of warmth and comfort to the hope that textiles can also have multiple functions such as health care and safety. Many pathogenic microorganisms can not only cause skin infections, decompose human metabolites to produce peculiar smell, endanger human physical and mental health, but also spread among people, causing infectious diseases, such as nosocomial infections. In the transmission of pathogens, textiles are one of the important media. Therefore, the antibacterial processing technology of textiles has emerged at the historic moment, and the existing antibacterial fibers are generally realized by adding antibacterial agents. There are two types of antimicrobial processing...

AI Technical Summary

Problems solved by technology

This method has better antibacterial durability, but has two conflicting features that lead to poor practicability: one, the antibacterial property is related to the content of additives, the higher the content of antibacterial additives, the stronger the antibacterial properties, but the higher the content of antibacterial additives, the fiber The physical indicators will be worse, so the amount added should not be too large

2. Because the antibacterial additive is added to the masterbatch before spinning, so that the antibacterial additive is evenly distributed in the masterbatch, and only the additive on the surface of the fiber after spinning can actually play an antibacterial role. The antibacterial agent is actually useless and has no antibacterial effect. Further increasing the content of additives in the fiber will affect the physical properties of the fiber

The textiles processed by van der Waals adsorption (such as dipping method, such as the patent "Preparation method of HAP mixed with silver and copper antimicrobial agent composite coating (CN201410366746.4)") are not strong enough, not resistant to washing, and are more likely to be exposed to salt in the presence of salt. Desorption in the case of desorption and loss of long-lasting antibacterial properties, and the fibers are stiff and the softness of the fabric is reduced

In addition, the Chinese patent CN108239881A discloses a method for preparing antibacterial fibers. In this method, although an intermediate (dimethylaminoethyl methacrylate) is grafted to connect the fibers and bactericidal ions through chemical bonds, the problem of The coating-type bactericidal layer is not resistant to washing; however, the grafting method from one end to the intermediate body is grafting with high-energy radiation and fiber ends. This method not only has high energy consumption, low grafting rate, and poor economy, it cannot be applied to In addition to large-scale industrial production, its intermediate product (quaternized fiber product) may also have certain human toxicity and affect fertility and fetal development (Toxicol. Sci. 2019, DOI: 10.1093 / toxsci / kfz139), which requires further research and observation. It is not suitable for direct application on textiles that are directly worn; at the same time, the other end of the intermediate is combined with permanganate through ionic bonds to achieve a bactericidal effect, but permanganate has a strong oxidizing property and is easily reduced, resulting in the loss of antibacterial properties; Moreover, the ionic bond is not resistant to salt, and the salt in sweat and detergent must exist, so that the antibacterial effect of the product is not valid for a long time. In addition, the permanganate ion itself has a purple color, which affects the subsequent dyeing process of textiles.

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