| Harmful micro-organisms (bacteria, fungi, viruses, etc.) are widespread in nature. There is awide range of harmful micro-organisms exists in water, air, soil, variety of surfaces, the body’ssurface and the coelom which contact with the outside world, etc. This huge number of harmfulmicro-organisms is a threat to human health. While the invention of antibiotics, vaccines, otherdrugs and biological agents has enhanced the safety precautions of health, making infectiousdiseases under control, but the current annual incidence of infectious disease still accounts forthe first place of the overall incidence in the world. Therefore, it is particularly important toresearch and develop effective long-lasting anti-bacterial textiles. In addition, it is rich inresources and the processing is convenient, so, it has been developed into a novel antibacterialagents. Using the bactericidal or bacteriostatic effect of zinc, silver, copper and other metals andtheir ion, loading them into a particular carrier. In this way, a Inorganic antibacterial agent isprepared. It successfully overcomes the shortcomings of organic antibacterial agent, such as poorheat resistance, easy to decompose, short service life，easy to produce drug resistance of bacteriaand so on.Inorganic antimicrobial agent is using zinc, silver, copper and other metal ions and theirbactericidal or bacteriostatic effect, finding its load on a particular carrier obtained. In all of themetal ions, silver does small harm to the human body, and owns excellent antibacterial effect.Mesoporous silica reveals ordered pore structure, uniform controllable pore size distribution,high specific surface area and pore volume, high chemical stability, which has attracted scholars’attention. At the same time, synthesis of mesoporous materials costs less, and it’s easy to get thetemplate of this material.Owing to the advantages of mesoporous silica and silver, an novel silver-supportingmesoporous silica antimicrobial (Ag/SBA-15) was synthesized by one-step method with addingAg into the process of preparing mesoporous carrier. Characterize this antimicrobial agent, andthen test the performance of its antibacterial properties and release. Then, padding theantimicrobial agent to cotton fabric by post-prepare methods, tests antibacterial properties and washing performance of cotton fabric, discussed and studied the changes of cotton fabricbetween pre-prepare and post-prepare of antimicrobial-treated in fabric’s whiteness, permeability,strength and other performance.The main tasks and conclusions of this issue are as follows:1. In this study, mesoporous silica antimicrobial Ag/SBA-15are be successfully synthesizedby using a one-pot synthesis route in which all the precursors are incorporated into this process.In a typical systhesis of Ag/SBA-15, P123is chosen as template agent, and tetraethylorthosilicate (TEOS),AgNO3are chosen as the sources of Ag.2. Investigated the effects of Ag in mesoporous silica, measured the amount of Ag inantimicrobial agents and the release properties of Ag by using XRD, TEM, EDS, atomicabsorption spectroscopy and N2adsorption/desorption technique,the results are as follows:(1) Small-angle XRD patterns show that in the curve of Ag/SBA-15,emergence a strongdiffraction peak in the2θ=1°, correspond with (100) lattice planes, two weak diffraction peaksexistence at about2θ=1.5°which corresponding to (110) and (200) lattice planes.All these showone-step synthesis of the antimicrobial agent can maintain good hexagonal ordered mesoporousstructure.(2) Wide-angle XRD patterns show that it existence four sharp diffraction peaks at2θ=38.2o,44.2o,64.4o,77.1o in Ag/SBA-15curve, the four peaks corresponding to the (111),(200),(220) and (311) lattice planes of metal Ag, this indicates that Ag has successfully doped intomesoporous silica materials, and formed a single mass.(3) TEM shows that in Ag/SBA-15, mesoporous pore can be clearly observed, meanwhile,elemental Ag dispersed in the mesoporous channels, at the average diameter of5~8nm.(4) N2adsorption/desorption tests show that the type of Ag/SBA-15’s physical adsorptionisotherms is Ⅳ, a typical mesoporous solid adsorption.(5) EDS, atomic absorption spectroscopy and other tests further showed that silver has beensuccessfully doped into the pores of mesoporous and contains14.8%silver. In addition, from therelease curve, in the first10days marinate the release of Ag+reveals a high speed, the speedbegan to slow down after the first10days, and release a total cumulative amount of30.28%ofAg, indicating that Ag+released slowly from anti-bacterial material, which makes antibacterialand antimicrobial more persistence. 3. Using colon bacillus and Staphylococcus aureus to test antimicrobial performance, theresults show that Ag/SBA-15can suppress escherichia coli and staphylococcus aureus bacteriawell, both the minimum inhibitory concentration (MIC) are40μg/mL.4. Ag/SBA-15were handled against discoloration, the results show that after anti-colortreatment, anti-bacterial agent’s color will not change significantly in the air, and the treatmentwill not affect the antimicrobial properties of antibacterial agents.5. By optimizing the type and concentration of dispersant, the type and concentration ofbinder, antimicrobial agent concentration, comes a complete set of cotton fabric antibacterialprocess. The bath ratio of1:10, choose SNF as dispersant, and anti-bacterial agent mass ratio of1:1, choose methyl acrylate as a binder, the concentration is30g/L, the concentration ofantimicrobial agent is200mg/L. The preparation of solution and cotton fabrics are as follows:the dispersant dissolved in deionized water, ultrasonic for1h, then add adhesive to ultrasonic5~10min, then place the cotton fabric in solution for2min. After soaking, the fabric will beremoved after Two-Baptist&Two-Crush step to make antimicrobial powder fully attached to thecotton fabric. Then, after90℃pre-drying for5min, baking120℃for3min. And test thewashing performance of cotton fabrics, the results show that the fabric still perform a goodantibacterial effect after washing50times.6. Breathable, wear, drape, crease recovery and tensile properties of cotton fabric before andafter the treatment has made a contrast. The results are as follows: After antibacterial treatment,wear performance enhanced remarkably and other properties are slightly reduced, but all thesedo not affect the production and application.These results indicate that with the one-step synthesis, cotton fabric owns good antibacterialproperties and washing performance, meanwhile, these no other effects on the performance ofthe original fabric. The antibacterial cotton fabric can be used in the textile, medical, clothingand other fields, and this issue provides a theoretical foundation, better ideas and methods inantibacterial cotton fabric. |
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