University of Zagreb
Repozitorij Tekstilno-tehnološkog fakulteta Sveučilišta u ZagrebuNot a member yet
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NANOPARTICLES OF ACTIVATED NATURAL ZEOLITE ON TEXTILES FOR PROTECTION AND THERAPY
Get PDFActivated natural zeolite clinoptilolite is microporous hydrated aluminosilicates crystals with well-defined structures containing AlO4 and SiO4 tetrahedral linked through the common oxygen atoms. It is to point out that zeolites act as strong adsorbents and ion-exchangers but having many other useful properties. Due to its cationexchange ability, zeolites have catalytic properties and, for that, multiple uses in medicine and industry, agriculture, water purification and detergents. Zeolites are nontoxic substance, excellent for UVR and microbes protection, for proteins and small molecules such as glucose adsorption. In this paper its positive effect on the metabolism of living organisms and its anticancerogenic, antiviral, antimetastatic and antioxidant effect. The activity of natural zeolite as natural immunostimulator was presented as well as its help in healing wounds. Therefore, the present paper is an attempt to modify cotton (by mercerization) and polyester (by alkaline hydrolysis) fabrics for summer clothing with addition of natural zeolite nanoparticles for achieving UV and antibacterial protective textiles
ADSORPTION OF PLANT EXTRACTS ON CATIONIZED COTTON
Get PDFCotton, like most textile fibers, is negative charged in neutral and alkali aqueous solutions. Dyestuffs, optical brighteners and finishing agents in aqueous solution have the same electrical charge as cotton. Therefore, adsorption processes are difficult due to these repulsive forces. This paper studies the application of water extraction plants of St. Johns wart, marigold and hibiscus for the finishing of modified cotton by mercerization and cationization. The mercerization is the oldest modification since 19th century, while the cationization is researched in last 10 years. In this paper cationization of cotton fabric for achieving electropositive charge and better adsorption properties was carried out with cationic compound, quaternary ammonium salt during the mercerization well as with commercial product for cationization Denimcol Fix-GF (Bezema). The cotton electrokinetic phenomena after modifications were determined by zeta potential, isoelectric point, point of zero charge and specific amount of surface charge. The adsorption ability of plant extracts with and without mordant was investigated
Synthesis and Structural Characterization of the 5-(2- Haloethyl)pyrimidines - Hydrogen-Bonded chains in a-(1- Carbamyliminomethylene)-g-Butyrolactone
Get PDFThree novel 5-(2-haloethyl)pyrimidine derivatives were synthesized and characterized by 1H-NMR, 13C-NMR, MS, IR spectra and elemental analysis. Iodine and chlorine atoms in the C-5 side chain were introduced by reaction of 5-(2- hydroxyethyl)pyrimidine with hydroiodic acid and phosphoryl chloride, respectively. The structure of the intermediate a-(1-carbamyliminomethylene)-g-butyrolactone was determined by X-ray crystal structure analysis. The molecule deviates very slightly from planarity. Three NHO hydrogen bonds link the molecules into one-dimensional chains of edge-fused rings
UV PROTECTION WITH ZEOLITE TREATED COTTON KNITTED FABRIC - THE INFLUENCE OF YARN LINEAR DENSITY
Get PDFUV radiation (UV-R) can be divided into UV-A, UV-B and UV-C radiation. UV-C radiation get absorbed by atmosphere, but diminishing of the ozone layer results with the reaching of UV-B and UV-A rays on the Earths surface. Even though the UV-A rays are necessary for vitamin D synthesis, longer exposure to UV-A and UV-B rays can cause acute and chronic reactions and damages such as erythema (sunburn), sun tanning, photocarcinogenesis and photoaging, as well as known skin aging and recently the formation of skin malignant neoplasm. Garment provides some UV protection, but in most cases there are not enough its sun screening properties. This protection, among other large number of factors, highly depends on fabric surface and construction, especially for longer pending in the sun. Therefore, in last few years different protective finishes and material modification were developed. This paper deals with the influence of yarn linear density of cotton knitted fabric on its ultraviolet skin protection expressed as ultraviolet protection factor (UPF). The effects of yarn linear density on UPF using knitted fabrics from the same cotton fibers were discussed. Raw, pretreated and zeolite treated cotton fabrics were used. UV-A and UV-B transmissions were measured on transmission spectrophotometer Cary 50 Solarscreen (Varian) according to AATCC Test Method 183-2000. On the base of these values Ultraviolet protection factor (UPF) was calculated
Surface Modification of Polyester Fabric with Tribomechanically Activated Natural Zeolite (TMAZ) Nanoparticles
Get PDFEuropski tekstilci udruženi u European Technology Platform for the Future of Textile donijeli su devet smjernica za razvoj tekstilstva u Europi. Nova primjena tekstilne tehnologije za izradu materijala visokih svojstava (medicinski tekstil, tekstil za za{titu i sport) jedna je od njih. U skladu s tim, ovaj rad je pokušaj modifikacije površine poliesterske tkanine nanočesticama tribomehanički aktiviranog zeolita (TMAZ) radi postizanja ve}e UV zaštite. Sposobnost zaštite poliesterskom tkaninom namijenjenom uglavnom za ljetnu odjeću od nepovoljna UV zračenja ispitana je nakon površinskih modifikacija alkalne hidrolize i obrade nanočesticama TMAZ-a te optičkog bijeljenja. Poliesterska tkanina od poli(etilen-tereftalata) površinski je modificirana alkalnom hidrolizom u natrijevoj lužini uz dodatak ubrzivača. Nanočestice TMAZ-a i optičko bjelilo Uvitex ERN-P (Ciba) naneseni su na površinu poliesterske tkanine termosol-postupkom. Površina tkanine istražena je skenirajućom elektronskom mikroskopijom (SEM). Određen je zaštitni učinak na UV zračenje te utjecaj na bjelinu (e. CIE whiteness, WCIE) i požućenje (e. Yellowing Index, YI) tkanine. Učinak površinskih modifikacija uspoređen je s učinkom UV apsorbera Tinofast PES (Ciba), posebno namijenjenoga za UV zaštitu. Postojanost obrade ispitana je nakon pranja. Alkalnom hidrolizom poliesterske tkanine dolazi do površinske modifikacije poliesterskog vlakna te tkanina poprima estetski izgled nalik na svilu. Obradom nanočesticama TMAZ-a ispunjavaju se napukline na alkalno hidroliziranoj poliesterskoj tkanini, dajući joj bolju adsorptivnost, dok estetski izgled ostaje. Optičkim bijeljenjem povećava se bjelina i UV zaštita. Optičko bjelilo i nanočestice TMAZ-a pokazuju sinergijski učinak na pove}anje bjeline i UV zaštite. Primjenom nanočestica TMAZ-a na modificiranoj tkanini postignuta je podjednaka UV zaštita kao primjenom UV apsorbera, koja se neznatno smanjuje u pranju.Textile Scientists, united in the European Technology Platform for the Future of Textiles, established nine topics as guidance for future textile development. New textile application for achieving the materials for human performance (medical, protective and sports) is one of them. This paper is an attempt to modify the surface of polyester fabric with nanoparticles of tribomechanically activated zeolite (TMAZ) for achieving better UV protection. Polyester fabric protective ability from UV radiation (UV-R) was investigated after different treatments - alkaline hydrolysis, TMAZ nanoparticle treatment, and optical brightening. Polyester fabrics of poly(ethyleneterphtalate) was alkaline hydrolyzed in sodium hydroxide with addition of accelerator for achieving silk-like fabric for summer clothing purposes. TMAZ nanoparticles and optical brightener Uvitex ERN-P (Ciba) were applied on polyester fabric surface by thermosol process. Fabric surface was investigated by SEM. UV protection with modified fabric; fabric whiteness (CIE whiteness, WCIE) and yellowness (Yellow Index, YI) were determined. The effect of surface modification was compared with the effect of UV absorber, Tinofast PES (Ciba) commercial product specially produced for UV protection. For the durability of treatment the fabrics were washed. Alkali hydrolysis modifies the surface of polyester fabric resulting in silk-like fabric. The treatment with TMAZ nanoparticles fills out the pits on fabric surface resulting in better adsorption, and retaining the silk-like appearance. Optical brightening increases the fabric whiteness and UV protection. Optical brightener and TAMZ nanoparticles show synergism in whiteness and UV protection increment. Modification with TMAZ nanoparticles results in UV protection similar to the one using UV absorber, which slightly goes off in the washing process