According to foreign media, a research team at a Brazilian start-up has developed a new textile material that can eliminate the new coronavirus on its surface in just two minutes, with an efficiency of up to 99.9%, or can be used to make medical masks and protective clothing.According to a report by the Buenos Aires Economic News Network in Argentina on June 17, researchers from the Institute of Biomedical Sciences of the University of São Paulo in Brazil, supported by scientists from the University of Jaime I in Spain, have developed a method that uses two different silver particles. New textile material of impregnated polyester fiber and cotton fabric blend.The project is being developed by a tech startup founded by researchers at the University of São Paulo. Researchers at a research and development center for functional materials in the state of São Paulo are also involved in the project.The start-up, Nanox, is developing antibacterial fabrics and fungicides, and this newly developed material will be used to make medical masks and protective clothing.Luis Gustavo Pagoto Simmons, head of Nanox, said: "We have applied for a patent for this technology and are in talks with two Brazilian textile companies. Once negotiated, the two companies will use the The technology makes medical masks and protective clothing."The results of tests conducted by the researchers showed that the fabric impregnated with silver microparticles inactivated 99.9 percent of the virus after only two minutes of contaminating its surface with organic matter, the report said.Lucio Freitas Junior, a researcher at the University of Sao Paulo and one of the leaders of the study, said: "The amount of Covid-19 that we used to contaminate the fabric during the test was much higher than the environment in which the medical masks were exposed. The number of viruses in the cells. Even in this case, the new material is able to clear the virus with high efficiency."The researchers are still testing the duration of the fabric's antiviral effects. Other materials previously developed by the company have antibacterial capabilities that last up to 30 washes.Simons said: "This fabric is the first development of the use of silver particles to inactivate the new coronavirus, and we will soon develop more kinds of anti-viral fabrics."

In the critical period when the current epidemic prevention and control situation is improving and the domestic economy is accelerating the recovery and development, the annual event of the textile industry - the 2022 China Textile Federation Autumn Joint Exhibition will be restarted again, bringing together China International Textile Fabrics and Accessories (Autumn and Winter) Expo, China International Garment Apparel Expo (autumn), China International Textile Yarn (autumn and winter) exhibition and China International Knitting (autumn and winter) expo four professional exhibitions will be unveiled at the National Convention and Exhibition Center (Shanghai) from August 29 to 31.This is not only a gathering of exhibitors, exhibitors, and audiences eagerly looking forward to after a few months of silence, but also an important business exchange and docking platform for industry companies to demonstrate their strength, expand markets, and seek business opportunities. We will strengthen the confidence of the whole industry and accelerate the coordinated resumption of work and production of upstream and downstream enterprises. We will try our best to recover the time and losses caused by the epidemic, and strive to compose textiles and garments on the road of a new journey with practical actions. new chapter.Gather pioneers and integrate innovationSince 2020, the ups and downs of the epidemic have continued to test the resilience of the supply chain of my country's textile and apparel industry chain. Especially since March, the spread of the domestic epidemic has caused many textile and garment enterprises to face huge challenges in their production and operations. It has become the consensus of everyone to adjust and optimize the layout of the supply chain, build a truly competitive industrial chain advantage, and ensure the safe and stable operation of the textile and garment industry supply chain.At this time, the co-frequency linkage of the four exhibitions at the same time and in the same place will undoubtedly provide a steady stream of new impetus and new potential energy for the restart of the industry, promote the docking, communication and integration and innovation of upstream and downstream enterprises in the industry chain, and promote the formation of a coordinated, efficient and smooth industry. Chain supply chain, strong development of resilience and anti-risk capabilities, and ultimately achieve a symbiosis and win-win situation for upstream and downstream enterprises. From textile fabrics and accessories, apparel, to yarn and knitting, new products, new technologies and new trends in the textile industry are gathered here. The four exhibitions work together to demonstrate the solid strength of China's textile and apparel industry.At the same time, each exhibition will hold a series of rich and diverse activities, through fashion trend release, forum salon, new product launch conference, live broadcast tour, high-quality selection and other forms, to output value information and help the industry to move forward.Gather business and seek common development"Golden Nine Silver Ten" has always been the peak season for textile and apparel trade, especially when the local epidemic prevention and control situation is becoming more and more stable, industry enterprises are stepping up to restore the previous level of production and operation. It has become the best choice for enterprises to seize the "Golden Nine Silver Ten" business opportunities with "recovery".Digital technology empowers business and trade. The four exhibitions will upgrade digital services, realize online and offline dual-track linkage, integrate omni-channel industry resources with digital technology, and help exhibitors and professional visitors connect efficiently during the exhibition. At the same time, a large number of professional audiences and channel resources will gather on the scene, and a series of business activities and customized precision business services will also release a large amount of backlog in the industry and stimulate market vitality again."Good things come from hard things, and brilliance always comes from hard work." Although the complexity, severity and uncertainty of my country's economic development environment are on the rise, there are always more ways than difficulties. In the face of the pressure in the early stage, many companies have seized the opportunity to transform production processes, promote digital transformation, and constantly innovate and polish "internal strength" to enhance their competitiveness. The China Textile Federation will also continue to provide services for enterprises, guide and help enterprises to seize the opportunity of integrated development of domestic and foreign trade, nurture opportunities in the crisis, and open new situations in the changing situation, so as to better promote the docking of domestic and foreign markets, Gradually form a new pattern of domestic and international "dual circulation".Gather business opportunities, strengthen confidence, and chain the future. At that time, the China Textile Federation's autumn joint exhibition will gather the power of the textile industry to innovate, forge ahead, and meet everyone at the Convention and Exhibition Center (go to the country sea).

When printing textiles with special paints, there must be printing pastes with different characteristics first, so let's review its origin. In the pigment printing of knitted fabrics, under its elastic extension, white spots (also called white ink) will appear in the printing part. Gold and silver powder printing is also affected by the low pH value of the pigment paste.Factors affecting the application (1) The contact time T (s) of the color paste movement element in the wedge-shaped area means that a certain mesh of the rotary screen starts from entering the wedge-shaped area of the paste storage and leaves the imprinting point (the contact point between the scraper or the magnetic bar and the rotary screen) ), the elapsed time is determined by the width B (mm) of the wedge-shaped area and the printing speed V (m/s): T=B/V.B can be calculated from the amount of printing paste pressed into the wedge-shaped area and the geometric characteristics. It is generally believed that the high printing speed will make the color paste more squeezed and increase the amount of paste. But in fact, it was found that high printing speed will reduce the amount of application, while the reduction of printing speed will increase the amount of pulp. The reason is that the high printing speed reduces the time, the contact time between the mesh and the color paste is reduced, and the amount of color paste exudation is reduced. Practice has proved that this factor is more dominant than other factors. The greater the viscosity of the colorant, the greater the effect of speed changes.In recent years, there have been reports in our country that the method of blending is used to modify it, but the emulsion is unstable and the film strength is greatly reduced. However, the method of copolymerization is used for modification, and there are few researches and applications at present. Through the silicone-modified acrylic resin leather finishing agent, the coating from the bottom layer to the middle layer can achieve very good surface performance with the same paste. Main quality indicators Emulsion appearance, fluorescent milky white liquid thermal stability, no precipitation chemical stability, is a general-purpose high-grade leather special finishing agent.

How to avoid unevenness in the printing and dyeing process is one of the important indicators of the quality of the printing and dyeing process. Leveling agent is an auxiliary agent used to make the dye evenly dyed on the dyed object. One of the functions of the leveling agent is enough to make the dye adsorbed by the fiber relatively slowly, and secondly, when the dyeing is uneven, it makes the dye in the dark part move to the light part, and finally achieves leveling. Therefore, retardation and migration are the two most important functions of leveling agents.In recent years, various new fibers have been widely used in the printing and dyeing industry. At the same time, with the gradual improvement of people's awareness of environmental protection, various types of leveling agents have been developed. The development of leveling agents for dyes is reviewed to better promote the research of leveling agents in my country.1. Levelling agent for reactive dyesThe dyeing of cellulose fibers, at present, the proportion of reactive dyes is the largest. Reactive dyes are water-soluble dyes containing reactive groups, which can chemically combine with macromolecules such as cotton, wool, and silk, so the soaping and rubbing of dyed fabrics are fast. degree is very high. The commonly used leveling agents are generally nonionic surfactants. In addition to nonionic surfactants, anionic leveling agents and complexes of nonionic and anionic surfactants have also been frequently used in recent years.The hydrophobic groups of commonly used 1F ionic surfactants can be higher alcohols, higher fatty acids, higher alkylamines, etc. The hydrophobic groups are above C12, and long-chain alkyl groups of C16 and C18 are ideal, which can be hydrophilic with polyoxyethylene. Water groups form ether-bonded, ester-bonded, amine-bonded, etc. linked forms.The commonly used leveling agents Pingping 0, leveling agent 102 and leveling agent OP have a certain leveling effect on the dyed part of reactive dyes. Because the long molecular chain of this type of leveling agent contains polyoxyalkyl ether, it can form loose oxygen bonds with hydroxyl (-OH), amino (-NH) and other groups in the dye molecule. On the one hand, it combines with the dye to form a relaxed complex in the dye liquor, which hinders the adsorption and dyeing of the dye, thus playing a role in retarding the dyeing; It further promotes the uniform adsorption of dyes. For example, leveling agent WE for wool is aliphatic amine polyoxyethylene ether, which belongs to non-ionic/weak cationic type. It is mainly used as leveling agent for reactive dyeing of wool, which can improve the color supply. Affects the dyeing percentage, and also has excellent leveling effect in medium, neutral, weak acid and metal complex dyes.2. Anionic surfactantsAnionic dispersing and leveling agents are dye affinity leveling agents. Anionic surfactants have the same ionic type as reactive dyes. The mechanism of preempting the dyeing mat is adopted to slow down the dyeing speed of dyes. Leveling agent EDER is an anionic leveling agent whose chemical composition is a complex of aromatic polyether sulfonates. It is a relatively new type of anionic leveling agent. Its advantages are as follows:1) The leveling agent EDER has a certain chelating and dispersing adjustment function for heavy metal ions such as calcium and magnesium, and improves the quality of dyes; (2) In the |: dye adsorption stage, it has excellent retarding performance, and controls the dye to evenly dye and adsorb. ; (3) In the fixation stage, buffer the pH of the dye bath to ensure that the dye is fixed evenly and evenly to avoid uneven fixation; (4) No adverse effect on the dyeing fastness of the fabric.Cotton dispersing and leveling agent 40Dx produced by Shanghai Daxlang Chemical Industry Co., Ltd. (Daxlang) is a new type of dispersing and leveling agent for cellulose fibers dyed with reactive dyes. In addition, it also has the effect of preventing the secondary agglomeration of metal ions such as calcium and magnesium and dyes to cause dye spots; it does not affect the final color, and has low foaming properties.In addition, there are reactive dye leveling agent 640 and Daimian ER which have good leveling properties for reactive dyeing.3. Compounds of nonionic and anionic surfactantsNonionic surfactants obtain retarding effect by combining oxygen atoms on polyoxyethylene bonds with dye molecules by oxygen bonds. At present, most of the nylon leveling agents provided by auxiliary manufacturers are anionic/nonionic composite leveling agents, mainly including nylon leveling agent M-2200 (Hangzhou Meigao Huayi Chemical), leveling agent SWP Ningbo Xinghua Chemical), Nylon Leveling Agent N-1l (Shanghai Daxiang Chemical), Nylon Leveling Agent GND (Nantong Sint Chemical), Leveling Agent FK460 (Beijing China Textile Chemical), Leveling Agent TBW-951 (Guangdong Demei Chemical) , Nylon leveling agent rrs (Wuxi Changsheng Fine Chemicals).2. Levelling agent for disperse dyes1. Polyester fabricWhen dyeing polyester with disperse dyes, the levelness is good, and the dyeing fastness is very high. At present, disperse dyes are mostly used for high temperature and high pressure dyeing in polyester dyeing processing, but it is difficult to color dark dyes and causes environmental pollution.Product development has been the most active research topic in the textile industry for the past two decades. The superfine polyester fabric has a fast color absorption rate, and an appropriate leveling agent should be added to the dyeing bath to improve leveling. The leveling agent should have the following conditions: (1) good retarding effect; (2) good migration effect; (3) good dispersing effect, especially at higher temperatures (such as 80-120 ℃) Dispersion of dyes; (4) Does not affect dye uptake and shade; (5) Good stability against hard water and various heavy metal ions. For example, the leveling agent RDP=2000 is made of polyol and aromatic acid after reaction, and then compounded with emulsifier. It belongs to non-ionic and anionic compound leveling agent. RDP-2000 has strong permeability and dye migration, which can improve the high temperature dispersibility of disperse dyes to a certain extent. The advantages are: (1) easy application and good effect; (2) wide technological adaptability; (3) effectively inhibiting tar spot and color spot phenomenon; (4) no adverse effect on the color light and fastness of dyestuffs. The new polyester high temperature leveling agent WYR-1 is developed by using sodium dodecyl benzene sulfonate, sodium dodecyl polyoxyethylene ether sulfate, polyoxyethylene (7) glycerin cocoate and surfactant WYR. The performance test and application show that WYR-l has good dye dispersibility, levelness, migration and dye uptake, low bubble point and cloud point higher than 100℃.2. Polyester microfiberCompared with ordinary fibers, microfibers have the characteristics of small monofilament fineness, large specific surface area and high content of amorphous area, which are easy to cause uneven dyeing. Therefore, it is very important to choose a suitable leveling agent.The leveling agent TF-215 developed by Zhejiang Transchemical Co., Ltd. can significantly reduce the initial adsorption percentage of disperse dyes, improve the desorption and migration of dyes at the initial stage and at high temperature, and increase the high temperature dispersibility and compatibility of dyes. Traditional disperse dyes can be used for microfiber dyeing in the presence of leveling agent TF-215.In addition, β-cyclodextrin is also an effective leveling agent in the study of dispersion dyeing of polyester microfibers. Cyclodextrin is a polycyclic glucose obtained by biotechnology, by degrading polysaccharide starch by cyclodextrin glucosyltransferase. Among them, the special cyclic structure of β-cyclodextrin can form inclusion complexes with most cationic dyes, so that they can be released slowly during the dyeing process, and the E dyeing rate can be slowed down to play a level dyeing effect. And the use of β-cyclodextrin does not affect the final surface color depth and color fastness of the dye, but it is not suitable to be used together with surfactants. The β-cyclodextrin ring has a moderate size, high solubility in water and biodegradation, and has a wide application prospect in printing and dyeing processing.

Since the application of pigment printing on textiles in the mid-1950s, my country has undergone continuous improvement and innovation, but the research on special pigment printing pastes has been slow and the effect is not good.The pre-emulsification process is to emulsify part of the monomers at room temperature before entering the reactor, so that the organosiloxane and acrylate can be effectively formed into monomer particles adsorbed by the emulsifier, and the dispersion is relatively uniform. When it is gradually added to the reaction kettle for chemical reaction, the polycondensation reaction of the organosiloxane itself and the free radical copolymerization reaction between it and the acrylate proceed simultaneously. At this time, the emulsifier adsorbed on the monomer particles gradually Transfer to the surface of latex particles to ensure the stability of the new polymer system generated by the reaction, reduce gel generation, and finally form a uniform and stable copolymer emulsion.Modification of acrylate with 5% to 10% of silicone monomer can make the synthetic paint printing adhesive feel soft and smooth. Adding 2% to 4% of N-methylol acrylamide can effectively improve the rubbing fastness of the pigment printing adhesive. Anionic/nonionic composite emulsification system (1:3) dosage 3%～4%, butyl acrylate dosage 50%～75%, ethyl acrylate dosage 20%～30%, acrylonitrile dosage 10%～15%, styrene The dosage of 5% to 10%, the dosage of acrylic acid is 2% to 4%, and the organic siloxane and reactive monomer are added. The synthesized paint printing adhesive has excellent performance and stable system. The pre-emulsification process of mixing organosiloxane and acrylic monomers can make the polymerization process safe and smooth, the polymer product system is stable, and there is no gel and oily phenomenon.

Acid dyes have complete chromatograms, bright colors, and the light fastness and wet fastness vary greatly with the variety of dyes. Mainly used for dyeing wool, silk and nylon, but also for leather, paper, ink, etc. Generally no coloring power to cellulose fibers.Direct dyes have water-soluble groups such as sulfonic acid group (-SO3H) or cause group (-COON) arranged in a linear molecular structure. The aromatic ring structure is in the same plane, so the direct dye has a greater affinity for cellulose fibers, and it can be dyed directly in a neutral medium as long as the dye is dissolved in dry water.Compared with the two, acid dyes have a simple structure and lack long conjugated double bonds and a flat structure, so they lack directness to cellulose fibers and cannot be used for dyeing cellulose fibers.