1,721,041 research outputs found
Antimicrobial finish of textiles by chitosan UV-curing
No full textIn this work cotton, silk fabrics and synthetic filter fabrics were impregnated with an acid solution of chitosan and photoinitiator and cured at room temperature by exposure to UV light. Process conditions such as percentage weight on, dilution, irradiation time and power, chitosan-fabric contact time were optimized in order to improve treatment fastness.
Obtained results showed a strong antimicrobial activity conferred by the treatment, homogeneous on fabric surface. It is evident already at low weights on, not affecting the hand properties of cotton or silk and the filtration characteristics of synthetic fabrics. Finally, fastness was better for silk and for samples prepared with the better interpenetration of chitosan inside fibers, nevertheless it was found that the lost in antimicrobial activity was not due to lost of chitosan from the fabrics but probably to the interaction between surfactant and chitosan
Fluorinated Compounds applied to Cotton Fabrics via Sol-gel
No full textThe sol–gel technique has been reported as a promising tool for preparation of water repellent coatings especially versatile for application on textile or wood. In the present work, hydro and oil repellency were conferred to cotton fabrics by an hybrid organic-inorganic finishing via sol-gel. The nanosol was prepared by co-hydrolysis and condensation of tetraethoxysilane (TEOS) and 1H,1H,2H,2H–fluorooctyltriethoxysilane (FOS) or Fluorolink S10, a lower cost commercial fluorosilane product, as precursors. The application on cotton was carried out by padding, followed by drying and thermal treatment, varying the weight on from 5 till 30% o.w.f. Treated samples were tested in terms of contact angles measured with both water and oil, drop adsorption times and washing fastness, and characterized by SEM, ATR and XPS analysis. Good results in terms of conferred properties were obtained in all the investigated cases but, considering the treatment fastness, best results were related to Fluorolink S10 nanosol. Moreover, a comparison with a conventional thermal finishing product was carried out, showing the sol-gel as a promising alternative process
Antimicrobial Finish of Textiles by Chitosan UV-Curing
No full textThe purpose of this research work was to develop a textile finish based on the radical UV-curing of chitosan on textiles to confer antimicrobial properties. Chitosan is a biopolymer with unique properties such as biodegradability, non-toxicity, antimicrobial activity. In this work cotton or silk fabrics and synthetic filter fabrics were impregnated with an acid solution of chitosan added of the photoinitiator in the proper amount and cured at room temperature by exposure to UV lamp. Process conditions such as percentage add-on, dilution, chitosan-fabric contact time, irradiation time and power, were optimized. The antimicrobial activity of finished fabrics was tested according to ASTM E 2149-01 standard test performed with Escherichia Coli ATCC 8739. Moreover dyeing test with Turquoise Telon dye were carried out to evaluate the treatment homogeneity while the amino group content was determined by ninhydrin assay. Moreover on cotton and silk fabrics the treatment fastness to domestic laundering was tested, according to UNI EN ISO105-C01. Obtained results showed a strong antimicrobial activity conferred by the treatment, homogeneous on fabric surface. It is evident already at low add-on, without affecting the hand properties of natural fabrics and the filtration characteristics of the synthetic filter fabrics. Finally, washing fastness was better for samples prepared with a better penetration of chitosan inside the fiber
Finissaggio del cuoio con processo sol-gel
No full textIl nostro studio riguarda la funzionalizzazione via sol-gel, con prodotti siliconici e fluorurati, di un cuoio Nabuk tinto, per migliorarne la resistenza all’abrasione e conferire idro e oleorepellenza.
La componente siliconica del finissaggio agisce come coating protettivo, migliorando la resistenza allo sfregamento e conferendo una certa idrorepellenza, mentre l’oleorepellenza è conferita dal componente fluorurato. Inoltre, l’applicazione del coating micro o nano strutturato via sol-gel consente di ridurre l’apporto di agente finissante necessario per ottenere l’effetto desiderato, mantenendo sul cuoio trattato le caratteristiche organolettiche ed estetiche tipiche della pelle.
Oltre alle valutazioni delle proprietà conferite tramite misure di solidità della tintura allo sfregamento, di angolo di contatto con acqua ed esadecano, rigidità ed effetto scrivente, è stata condotta una analisi tramite FTIR-ATR per rilevare la presenza dei gruppi funzionali superficiali desiderati
Cotton and polyester surface modification by methacrylic silane and fluorinated alkoxysilane via sol-gel and UV-curing coupled process
No full textThe aim of the present work was the surface modification of cotton and polyester fibers to confer hydro and oil repellency to the fabrics. Sol-gel, previously investigated by the same authors as textile finishing, was here chosen as surface treatment not involving the bulk of the fibers, so fabrics can keep unvaried comfort characteristics. Moreover, it was coupled to post-UV-curing to enhance the finishing adhesion to fibers, improving treatment fastness. Process optimization was in fact focused on an economical and ecofriendly process to obtain an effective finishing with good fastness to washing. 3-(Trimethoxysilyl)propyl methacrylate (MEMO) was used as sol-gel precursor both alone and with Fluorolink® S10, a commercial product from Solvay Solexis (Italy), to obtain an UV-curable modified nanosol to be applied to fabrics with add-ons ranging from 5% to 30% o.w.f. (on weight of fibers). Treated samples were tested by means of contact angle measurements with water and oil while fastness to washing was tested according to ISO standard (till 5 washing cycles). Moreover the modifications that occurred on fiber surface were investigated by FTIR-ATR and XPS while the influence on thermal properties was revealed by DSC measurements. Promising results were obtained in terms of conferred water and oil repellency and treatment fastness, enhanced in particular on UV post-cured samples, as expecte
UV-grafting di chitosano per il finissaggio antibatterico sostenibile di tessuti (parte I)
No full textIl chitosano è un biopolimero di origine naturale, non tossico, con spiccata attività antibatterica e fotoreticolabile. Il processo di UV-grafting prevede l'aggraffaggio delle macromolecole di chitosano al tessuto tramite radiazione ultravioletta, in presenza di fotoiniziatore radicalico. Nella parte I la ricerca è stata svolta a livello di laboratorio variando i principali parametri di processo quali percentuale di carica, tempo e temperatura di impregnazione; i campioni sono quindi stati caratterizzati da un punto di vista chimico, fisico e morfologico e ne è stata testata l'attività antibatterica anche dopo ripetuti lavaggi
Application of fluorinated compounds to cotton fabrics via sol-gel
No full textThe aim of this work was the study of the surface modification of cotton fibers to confer hydro and oil repellency to the fabrics. A surface treatment not involving the bulk of the fibers was chosen, so fabrics can maintain comfort properties. Moreover the study focused on an economical and environmental friendly process, in order to obtain an effective treatment with good fastness to washing. A modified silica based film was applied on fibers surface by sol-gel, comparing laboratory grade reagents with a commercial product as precursors and optimizing process parameters. From obtained results sol-gel can be indicated as a promising process to confer an effective and durable finishing to cotton fibers with low add-ons. Long impregnation times can significantly improve the treatment fastness, while ironing the washed samples can restore, at least partially, hydro and oil repellency lost after the washing. Obtained results were supported by a deep surface characterization of untreated, treated and washed samples. The best results were obtained using the commercial product as the only precursor. This is interesting for an industrial application, due to the low cost of this product if compared with the laboratory grade reagents investigated. Some applications of finished textiles can be for household use, technical garments, umbrellas or outdoor textiles
Surface Modification of Cotton and Polyester Fibers by Methacrylate Silane and Fluorinated Alkoxysilane via Sol-gel and UV-curing Coupled Process
No full textThe aim of the work was the surface modification of cotton and polyester fibers to confer hydro and oil repellency to the fabrics. Sol-gel, previously investigated by the same authors as textile finishing [1-3], was here chosen as surface treatment not involving the bulk of the fibers, so fabrics can keep unvaried comfort characteristics. Moreover, it was coupled to post UV-curing to enhance the
finishing adhesion to the fibers, with a consequent improvement of treatment fastness. Process optimization was in fact focused on an economical and ecofriendly process to obtain an effective finishing with good fastness to washing.
3-(Trimethoxysilyl)propyl methacrylate (MEMO) was used as sol-gel precursor both alone and with Fluorolink® S10, a commercial product from Solvey Solexis (Italy), to obtain an UV-curable modified nanosol to be applied to fabrics with weight-ons ranging from 5% to 30% o.w.f. Treated samples were tested by means of contact angle measurements with water and oil while fastness to washing was tested according ISO standard (till 5 washing cycles). Moreover the modifications occurred on fibers surface were investigated by FTIR-ATR and XPS while the influence on thermal properties were revealed by DSC measurements.
Promising results were obtained in terms of conferred water and oil repellency and treatment fastness, enhanced in particular on UV post-cured samples, as expected.
[1] F. Ferrero and M. Periolatto, Appl. Surf. Sci., 257, 201 (2013).
[2] M. Periolatto, F. Ferrero, A. Montarsolo, R.Mossotti, Cellulose, 20(1), 355 (2013). [3]
A.Montarsolo, M. Periolatto, M. Zerbola, F. Ferrero, R. Mossotti, Text. Res. J. , 83(11), 1190 (2013)
Glycerol in comparison with ethanol in alcohol-assisted dyeing
No full textThe dyeing processes can be reformulated to reduce the environmental pollution with economic advantages by the substitution of most auxiliary products with low cost, non-toxic and biodegradable products derived from natural sources. In a previous work a chemical substitution study was carried out with ethanol and the results showed a favorable effect of ethanol addition, at about 1-3% v/v, on the dye
uptake, with some differences depending on fiber nature and dye class. In the present study glycerol was considered as alternative to ethanol due to the very low volatility and high boiling point which make safer its use in industry. The effect of glycerol introduction without other additives in isothermal dyeing of various fiber yarns (wool, cotton, polyester, nylon 6 and acrylic) was experimented and compared with that of ethanol. Moreover the equilibrium data obtained were correlated with contact angle measurements of water-glycerol solutions on the yarns. Glycerol, like ethanol, is able to improve the dye uptake. In the case of synthetic fibers the wetting effect was confirmed by a minimum of interfacial tension in the range 1-3% v/v of glycerol in water. However in the case of wool and cotton other effects should be
considered, involving the glycerol penetration into the fiber structure favored by hydrogen bonds formation. Finally environmental benefits and cost savings arising from substitution of auxiliary agents with glycerol were considered and some advantages of glycerol in comparison with ethanol were highlighted
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