Antibacterial property is another important indicator for people’s close-fitting clothing. Since the fabric is composed of fibers, the porous object shape and the chemical structure of the high molecular polymer are conducive to the attachment of microorganisms and become a good place for microorganisms to survive and reproduce. Therefore, we We need certain technical means so that the clothes we wear can have sterilizing and antibacterial effects.
There are currently two types of fabrics with antibacterial effects on the market. The first type is to use fibers with antibacterial effects as raw materials to make the fabric itself antibacterial. Common antibacterial fibers include:
1. Silver-based antibacterial fibers such as silver ions and nano-silver
2. Bamboo fiber
3. Bamboo charcoal fiber
4. Pure chitin fiber
Although this type of antibacterial fiber raw material is durable and washable, its cost is too high and is often only used in high-end fabrics. It is not suitable for corporate promotion and long-term development. So is there a cheaper way to make fabrics antibacterial? The answer is yes.
This is the second type of product. Through post-processing, during the fabric printing, dyeing and finishing process, antibacterial agents are applied and fixed by dipping, padding, coating or spraying, so that traditional fabrics are also antibacterial. Currently, silver-based antibacterial additives such as silver ions and nanosilver are commonly used. The active group of nanosilver is a charged silver ion. Because its size is in the nanoscale range, it will bring special properties that are completely different from metallic silver. The antibacterial effect of nanosilver is greatly enhanced. The mechanism may be related to its large specific surface area that can release silver ions faster, or it may be related to the surface activity of nanosilver itself. Therefore, a smaller concentration of nanosilver can be used to achieve a stronger antibacterial effect. It is precisely because of this powerful antibacterial ability that nanosilver is widely used in all aspects of life.
There have been discussions about the safety of nanosilver for a long time. Some people believe that thousands of years of use of metallic silver have proven that silver is not harmful to health. However, this view ignores the differences between nanosilver and metallic silver. Nanosilver also has special properties that metallic silver does not have. At present, our understanding of the toxicity of nanosilver is still very limited. Others argue that nanosilver may be harmful to human health and the environment.
Although silver has powerful antibacterial effects, silver cannot differentiate between good bacteria and bad bacteria. Under normal circumstances, our human body carries some non-pathogenic bacteria. These good bacteria are beneficial to our health. For example, the skin is the body’s first line of defense against external invasion. In addition to its own barrier function, the skin Normal bacteria present on the surface also play an irreplaceable protective role. When nanosilver products are used in contact with the skin, this layer of biological defense system will be destroyed, causing damage to the immune system.
There is currently no direct evidence of the impact of nanosilver on human health, but from some in vitro experiments we can see the potential harm that silver may have. Studies have shown that exposure to silver nanoparticles can lead to inflammatory responses, oxidative stress, genotoxicity (effects on germ cells) and cytotoxicity. Nanoscale silver is more toxic than large scale silver, probably due to the increased specific surface area caused by the small size. But experiments are still needed to prove whether the toxic effect of nanosilver comes from the small size effect or from the silver ions it releases, or both. Extended reading: https://www.tpu-ptfe.com/post/7720.html
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