Alternative methods for transferring mosquito repellent capsules containing bio-based citronella oil to upholstery fabrics: coating and printing / Merih Sariisik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 323–336 Titre : Alternative methods for transferring mosquito repellent capsules containing bio-based citronella oil to upholstery fabrics: coating and printing Type de document : texte imprimé Auteurs : Merih Sariisik, Auteur ; Gülsah Ekin kartal, Auteur ; Gökhan Erkan, Auteur ; Sadi Etkeser, Auteur Année de publication : 2022 Article en page(s) : p. 323–336 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ameublement Citronnelle Coacervation La coacervation est un phénomène colloïdal qui implique la diminution de solubilté d'un polymère dans un solvant par addition de quantité importante de différents composés : un alcool, un deuxième polymère plus soluble ou un sel (sulfate de sodium). Les molécules de polymère qui sont désolvatées coalescent et forment des gouttelettes, dites gouttelettes de coacervat. Si la coacervation se fait dans un milieu ou il y a deux phases, les gouttelettes de coacervat se regroupent à l'interface créant ainsi une membrane. Il suffit alors de durcir la membrane, de la rendre plus résistante par des réactions de crosslinking entre les molécules de polymère. Coacervation simple : La coacervation est déclenchée par addition d'un alcool concantré, par exemple de l'éthanol à 50% ou du sulfate de sodium Coacervation complexe : La coacervation complexe repose sur le même principe que la coacervation simple excepté que : le polymère en solution dans la phase continue est un polymère chargé, un deuxième polymère est utilisé pour modifier le solubilité du premier. Ce deuxième polymère porte une charge opposée à celle du premier. Encapsulation Enduction textile Ethylcellulose Insecticides Matériaux -- Imprégnation Microcapsules Morphologie (matériaux) Moustiques Textiles et tissus Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this study was to prepare insect repellent textiles and compare the application methods. Bio-based insect repellent agent citronella oil was encapsulated with ethyl cellulose shell with coacervation method. Morphological assessment showed that capsules had smooth surfaces and their shape was spherical. The homogenous size distribution of the capsules was supported and the mean particle size of the optimum formulations was almost 50 μm. Outdoor upholstery fabrics were treated with citronella capsules by coating and printing to compare the application methods. After application, the insecticide effects of the fabrics were investigated and compared with the impregnation method. Insecticide activity was evaluated against common house mosquitoes (Culex pipiens), with respect to cone bioassay of World Health Organization. Mosquitoes tended to stay away from treated fabrics, and mortality rates of mosquitos were noted as 72, 65 and 55% for printing, coating and impregnation, respectively, and the fabrics still showed repellency after five washing cycles. This study showed that the developed product might be used as an alternative to the other products in the market for avoiding mosquito-borne diseases and these results showed that capsules can be transferred by printing and coating processes when compared with the impregnation method. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the microcapsules - Mass yield of microcapsule - Particle morphology of microcapsules - Particle size of microcapsules - Fourier transform infrared spectrophotometer (FTIR) analysis - Thermogravimetric analysis (TGA) - Application of the microcapsules to the outdoor upholstery fabrics - Evaluation of treated fabrics - RESULTS AND DISCUSSION : Mass yield of microcapsules - Particle morphology of microcapsules - Particle size of microcapsules - Fourier transform infrared spectrophotometer (FTIR) analysis - Thermogravimetric analysis (TGA) - Evaluation of treated fabrics - Table 1 : Capsule transfer prescription for printing method - Table 2 : Capsule transfer prescription for coating method - Table 3 : Capsule transfer prescription for impregnation method - Table 4 : Mass yield of microcapsules - Table 5 : SEM photomicrographs of outdoor upholstery fabrics treated with citronella capsules with no wash, after 5 washing cycles and after rubbing - Table 6 : The ion chromatogram of citronella oil and GC-MS diagrams of outdoor upholstery fabrics treated with citronella capsules with no wash and after 5 washing cycles - Table 7 : Citronella amount in the samples as a result of GC-MS analysis - Table 8 : m2 weight changes of samples before and after washing - Table 9 : Insect repellent effect results of samples - Table 10 : Dimensional change percentage for fabrics - Table 11 : Fastness test results of capsule-transferred fabrics containing citronella - Table 12 : Color measurements of fabrics DOI : https://doi.org/10.1007/s11998-021-00529-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00529-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37161 [article]

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