Simultaneous dyeing and anti-bacterial finishing of textile by sol-gel technique (original) (raw)
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Journal of Sol-Gel Science and Technology, 2010
Antimicrobial textile materials were produced by sol-gel coatings with embedded biocidal compounds. For preparation a sol-gel procedure was used, starting from pure silica sols and 3-glycidyloxypropyltriethoxysilane (GLYEO) containing silica sols. These sols were modified with silver compounds, hexadecyltrimethyl-ammoniump-toluolsulfonat (HTAT) and copper compounds, respectively. The investigations were performed on viscose fabrics as function of the concentration of biocidal compounds and of thermal treatment of textile after dip-coating between 80 up to 180°C. The use of modified silica coatings leads to a decreased growth of fungi (Aspergillus niger) and bacteria (Bacillus subtilis and Pseudomonas putida) with increasing amount of the biocide embedded in the coating. The addition of GLYEO supports the biocidal effect of the coatings and enhances the stability of the coating solutions. For preparation of antimicrobial silica coatings the biocides silver, copper or HTAT can be used alone but the combination of these compounds leads to enhanced results against both fungi and bacteria. Therefore silica sols containing a combination of different types of biocides may be used for antimicrobial modification of textiles in some practical applications. For industrial applications the here presented coating solutions are especially advantageous, because of 90% water content in the solvent.
A novel sol-gel multi-layer approach for cotton fabric finishing by tetraethoxysilane precursor
Surface and Coatings Technology, 2013
The way of producing functional textile finishings by the sol-gel process using a multistep approach, consisting of consecutive depositions of sol layers on cotton fabric, for obtaining architectures with a different number of layers (namely, 1, 3 or 6 layers) is discussed. To this aim, tetraethoxysilane (TEOS) has been used as a precursor and the role of such architectures has been deeply investigated and correlated with the sol concentration and with the presence of the condensation catalyst DBTA (Dibutyltindiacetate). The multi-layer coatings were applied by padding using sols containing appropriate molar ratios of the precursor, anhydrous ethanol, catalyst and hydrochloric acid. The effects of the catalyst during the alkoxide reaction and the silica amount applied by sol-gel treatment on the thermo-oxidative behavior of the treated fabrics were deeply studied. FT-IR ATR spectroscopy, SEM analysis, thermal and thermo-oxidative stability, washing fastness, flammability and mechanical properties of the sol-gel treated cotton fabrics have been also investigated. The results obtained should be interpreted according to the properties investigated. The higher the concentration and the number of layers of the inorganic matrix, the higher the heat protection of textile samples. However, the resulting coating was so rigid that it modified the mechanical properties and particularly it decreased the wear resistance according to Martindale test. To improve the mechanical properties the best results were obtained by modulating a lower concentration of the matrix using a layered approach. In all cases, high adhesion of the coating to the textile fabrics was observed.
Inorganics
The surface modification of textile fabrics and therefore, the development of advanced textile materials featuring specific implemented and new properties, such as improved durability and resistance, is increasingly in demand from modern society and end-users. In this regard, the sol–gel technique has shown to be an innovative and convenient synthetic route for developing functional sol–gel coatings useful for the protection of textile materials. Compared with the conventional textile finishing process, this technique is characterized by several advantages, such as the environmentally friendly approaches based on one-step applications and low concentration of non-hazardous chemicals. The sol–gel method, starting from inorganic metal alkoxides or metal salts, leads to inorganic sols containing particles that enable a chemical or physical modification of fiber surfaces, giving rise to final multifunctional properties of treated textile fabrics. This review considered the recent develo...
Effects of a multi-step sol-gel process of inorganic silica coatings on cotton fabrics
2013
In this work the sol-gel synthesis of silica thin films and a novel multistep process consisting of 1-6 consecutive depositions of tetraethoxysilane (TEOS) onto cotton fabric are presented: samples with a different number of silica layers, with the last one alternately consisting of DBTA (Dibutyltindiacetate) catalyst, were obtained. The interaction of sol-gel derived silica coatings and the textiles fabrics were studied by changing two process variables: the TEOS concentration and the presence or absence of the catalyst.
Nanoparticles have been increasingly used to improve the properties of textile fabrics. Viscose and polyester fabrics are treated with SiO 2 nanoparticle by another technique than the conventional sol–gel method in presence of binder (acrylate based copolymer). The effect of the content of SiO 2 nanoparticle on the physical properties of the treated fabrics such as moisture regain, tensile strength and elonga-tion % were investigated. Furthermore, the antibacterial activity and coloration properties of pretreated fabrics were evaluated. Characterizations of pretreated samples by infrared spectroscopy and scanning electron microscopy were also conducted. The results show that the physical and coloration properties of pretreated samples were improved. The treated viscose fabric showed outstanding antibacterial performance against both Escherichia coli (G−) and Staphylococcus aureus (G+). Excellent durability of the treatment to repeated home laundering toward antibacterial and coloration properties was obtained in presence of binder.
Coating process for antimicrobial textile surfaces derived from a polyester dyeing process
Journal of Coatings Technology and Research, 2015
The presented study introduces an approach for coating to realize antimicrobial textile surfaces without the use of nanoscaled metal particles. Bactericidal metal ions were used instead of elementary metal particles and stored in alginates, which were fixed on the textile substrate by a coating application. A newly developed coating process for fixation was conducted which was derived from a polyester dyeing process leading to a significantly higher antimicrobial activity than the application of a common sol-gel coating. For this purpose, a specific coating agent was developed. Antimicrobial testing was done by a viability assay against Escherichia coli and Staphylococcus aureus. The promising results in antibacterial activity could probably in the future lead to useful coating applications for textiles as well as for other polymeric substrates.
Investigation on the effects of antibacterial finishes on dyed cotton knitted fabrics
Tekstil ve Konfeksiyon
The main objective of the research was to obtain antibacterial and antifungal effects in case of dyed cotton knitted fabrics. In addition to antibacterial properties, other effects of the antibacterial treatment on the dyed fabrics were investigated: the amount of metal bonded on fibre, the chromatic parameters, and the dye fastness. During the finishing process, the samples were subjected to several treatments, as: preparation for dyeing, pre-treatment with chitosan, dyeing with Direct Green 26 dye. In order to provide dyed materials with antibacterial properties, the samples have been treated, in different conditions, with different concentrations of silver nitrate (AgNO3) and zinc sulphate (ZnSO4) solutions. After the finishing process, the samples were tested against several microbial organisms: bacteria (gram positive and gram negative) and fungi. Due to their antimicrobial activity, both chitosan and metal salts have been taken into consideration in the research. Fourier trans...
Journal of Sol-Gel Science and Technology, 2014
In the present study, a possibility to realize a transparent sol by zinc-based precursors in a neutral medium without acidic or alkaline catalyst was investigated. Moreover, to study the influence of an inorganic-organic hybrid polymer on the proposed antibacterial finishing, the Zn-based sol was mixed with 3-glycidoxypropyltrimethoxysilane (GPTMS), a hybrid sol-gel precursor, to produce zinc-containing silica coatings on the cotton fibres. An optimization of functionalization process parameters was performed by monitoring survival rate of Escherichia coli bacteria. Finally, selected finishes were tested in respect to their antibacterial activity using potential pathogenic bacteria Staphylococcus aureus and Klebsiella pneumoniae. Sol-gel synthesized cotton finishes based on nano-Zn acetate without and with GPTMS showed larger bactericidal and bacteriostatic activities. The both types of finishes also show hydrophobic effect within the first eliminates the hydrophobicity effect and reduces antibacterial activity. The results are very promising, since the antibacterial activity of cotton is comparably high and the finishing procedure is cheap and can be easily performed.
Simultaneous dyeing and antibacterial finishing for cotton cellulose using a new reactive dye
Carbohydrate Polymers, 2013
A new bifunctional reactive cationic dye containing bis (monochlorotriazine/quaternary ammonium) reactive cationic system was synthesized. This dye and its monofunctional analogue were studied for simultaneous dyeing and antibacterial finishing of nylon fabric using exhaust method. Relatively high exhaustion and total dye fixation were achieved at pH 5 and 100°C for both dyes. The bifunctional dye exhibited higher levels of exhaustion and fixation efficiency compared to the monofunctional dye. Antibacterial activities of the dyed samples at different concentrations of both dyes were studied against gram positive (Staphylococcus aureus) and gram negative (Escherichia coli) bacteria. The dyed samples for both dyes are durable to washing and exhibited antibacterial activity after 10 times wash. The presence of the additional quaternary ammonium group in the bifunctional reactive cationic dye promotes a higher antibacterial activity on nylon 6 fabric compared to the nylon fabric dyed with the monofuncional dye. The dyeings exhibited good to high fastness properties.
Innovative Approach to the Creation of Textile Materials with Antimicrobial Properties
Science and Innovation, 2021
Introduction. In recent years, there has been a constant search for more advanced and environmentally friendlymeans for antimicrobial treatment of cellulose-containing tissues of various intended uses in the textile industry.Problem Statement. The problem of protection of textile materials and products from microbiological destruction is complex and multifaceted and needs to be solved. Today, one of the methods of protection is to provide textile materials with biocidal properties, which not only prevents the growth of bacteria, but can also ensure a high level of tissue safety. Therefore, we are faced with the task of finding new safe biocidal products.Purpose. The research has been made to determine the level of safety of textile materials treated by biocidalsubstances with the thiosulfonate structure including Ethylthiosulfanilate, Methylthiosulfanilate and Allylthiosulfanilate.Materials and Methods. The fabrics of different chemical composition were used in the study, designed f...