Function Improvement Of Antibacterial Finishing Agent To Feed Main Body Of Nonwoven Antibacterial Products

< p > with the development of modern nonwoven technology, nonwoven materials are applied more and more in medical products, health care products, daily use articles, upholstery fabrics, automobile interior decorations and various public places. However, the short board of bacteria which is easily infected with nonwoven materials has always been a "heart disease" in the industry. In particular, the metabolites such as sweat and sebum that may be attached to the human body are more suitable for the growth of bacteria.

Among them, antibacterial agents, which have been developing weak positions, have become the primary task to enhance the antibacterial function of nonwoven materials.

< /p >

< p > University of London researchers recently published a paper in the journal that a new type of nonwovens photocatalytic antibacterial agent TiO2 has been developed.

This material has a lethal effect on bacteria under light conditions, and has a good antibacterial effect in the dark environment. Modern hospitals, such as the widely used antibacterial material, can effectively reduce nosocomial infection.

< /p >

< p > < strong > three kinds of crystal structures are realized together with < a href= "//www.sjfzxm.com/news/index_c.asp > > antibacterial effect < /a > /strong > /p >

Compared with ordinary antibacterial properties, nano TiO2 photocatalytic material has the properties of high temperature resistance (>600 C) and good safety, resistance, weather resistance and heat resistant processing. < p > it can be widely applied in the fields of antibacterial fabrics and nonwovens.

At the same time, TiO2 photocatalytic materials can also decompose harmful gases and organic compounds such as formaldehyde, ammonia, benzene, xylene, sulfur dioxide and nitrogen oxides to achieve antibacterial and purifying effects of air and water.

The antibacterial mechanism and regeneration principle of nonwovens treated with near photocatalytic antibacterial agents, and the production of antibacterial substances under the condition of light protection will ensure the long-term effectiveness of antibacterial.

< /p >

< p > University of London professor Jackson pointed out that photocatalytic inorganic antibacterial agent is a new antibacterial agent which can achieve antibacterial effect by photocatalytic properties of semiconductor materials.

The band structure of semiconductor materials is generally composed of low energy entrainment and high energy conduction band. There is a forbidden band between valence band and conduction band.

The band gap of semiconductors is generally 3.0eV.

When the energy is greater than or equal to the energy gap, the absorption of light by semiconductor materials can produce electron (e-) - hole (h+) pairs.

Due to the lack of continuous region between semiconductor semiconductors, photoelectron hole pairs usually have picosecond lifetime, which is sufficient for photoelectron and photoinduced holes to pfer species to the semiconductor surface through the band gap to the solution or gas phase.

TiO2 has three crystal structures: rutile, perovskite and anatase. The three crystal structures can achieve antibacterial effect together.

The band gap of anatase TiO2 is 3.2eV, which corresponds to the photon energy of 387.5nm.

At the same time, the size of TiO2 particles has certain effect on the antibacterial effect. The smaller the TiO2 particles, the better the efficacy of killing bacteria. The commonly used TiO2 antibacterial agents are mostly ultrafine TiO2, and nano scale TiO2 has more antibacterial properties.

< /p >

< p > < strong > < a > href= > //www.sjfzxm.com/news/index_c.asp > > nanometer > /a > TiO2 the development of antibacterial agents has four trends: /strong > /p >

< p > there are many semiconductor materials with photocatalytic properties, such as TiO2, WO3, ZrO, V2O3, ZnO, CdS, SeO2, GaP, SiC, SnO2, and so on. However, other materials such as stability, oxidation and short life span exist in addition to other materials.

< /p >

< p > the characteristics and application prospect of TiO2 photocatalytic antibacterial activity. Zhang Jian, researcher of Northwest Nonferrous Metal Research Institute, thinks that the research and development of TiO2 photocatalytic inorganic antibacterial materials may be embodied in 4 aspects.

一是TiO2光催化杀菌反应是紫外光激发下的反应，光催化活性氧类存在的时间非常短，生活空间能利用的紫外光较少，如果进一步提高其光激发波长范围，同时提高其对细菌的吸附性，大活性氧类与细菌的接触，使更多的光活性氧类物质得以产生，那么纳米二氧化钛抗菌剂将可以更多地参与光催化反应，大幅度提升非织造材料的整体功能;二是提高其施用性，低成本、高活性、耐候性、实施方便的光催化抗菌涂料将是今后开发的一个重要方向;三是由于釉面砖、 玻璃等表面的 TiO2 光催化涂膜需要再次烧结，因此，有必要研究它们表面生产过程中的在线涂膜技术，从而避免涂膜工艺中基体的清洗过程，并使基体生产和涂膜工艺所需的烧结过程一步完成;四是由于并非所有的细菌都对人体有害，而 TiO2 光催化杀菌效应却是针对所有的细菌，因此如何提高其对细菌的选择杀灭

Sex is also something that researchers must consider.

< /p >

< p > < strong > < a > href= > //www.sjfzxm.com/news/index_c.asp > > industry standard < /a > making work is urgent. < /strong > /p >

< p > although the market of antibacterial products has broad application prospects, the market of domestic antibacterial products is mixed and the quality of products is not good, which seriously affects the healthy development of antibacterial products market.

In addition, the entry of multinational corporations is undoubtedly a great challenge to the development of China's antibacterial industry.

Zhang Yingzeng, director of the Secretariat of the antibacterial Industry Branch of the National Health Industry Enterprise Management Association, said that in the field of building materials, although the popularization and application of nonwoven antibacterial products in building materials products have yielded fruitful results, there are still uneven developments in various parts of the country. Most enterprises should be relatively small in scale, and the production process is relatively backward, and the product grades, quality and economic benefits are relatively low, which has affected the development of the industry.

Moreover, many products that claim to have antibacterial functions exist false propaganda, exaggerated propaganda or even shoddy conditions.

In order to avoid being investigated and dealt with, some products usually use unilateral propaganda of antibacterial function instead of propaganda of antibacterial products.

< /p >