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Improvement of light fastness of water-based printing inks with addition of glycerol derivative containing thiol groups in COLORATION TECHNOLOGY, Vol. 134, N° 2 (04/2018)
[article]
Titre : Improvement of light fastness of water-based printing inks with addition of glycerol derivative containing thiol groups Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 100-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Encre d'imprimerie
Encre en phase aqueuse
Essais accélérés (technologie)
Films plastiques
GlycérineLe glycérol, ou glycérine, est un composé chimique de formule HOH2C–CHOH–CH2OH. C'est un liquide incolore, visqueux et inodore au goût sucré, utilisé dans de nombreuses compositions pharmaceutiques. Sa molécule possède trois hydroxyles correspondant à trois fonctions alcool responsables de sa solubilité dans l'eau et de sa nature hygroscopique. Un résidu glycérol constitue l'articulation centrale de tous les lipides de la classe des triglycérides et des phosphoglycérides.
PROPRIETES PHYSIQUES : Le glycérol se présente sous la forme d'un liquide transparent, visqueux, incolore, inodore, faiblement toxique si ingéré (mais laxatif à haute dose), au goût sucré.
Le glycérol peut se dissoudre dans les solvants polaires grâce à ses trois groupes hydroxyles. Il est miscible dans l'eau et l'éthanol ; et insoluble dans le benzène, le chloroforme et le tétrachlorométhane.
Son affinité avec l'eau le rend également hygroscopique, et du glycérol mal conservé (hors dessicateur ou mal fermé) se dilue en absorbant l'humidité de l'air.
- PROPRIETES CHIMIQUES : Dans les organismes vivants, le glycérol est un composant important des glycérides (graisses et huiles) et des phospholipides. Quand le corps utilise les graisses stockées comme source d'énergie, du glycérol et des acides gras sont libérés dans le sang.
- DESHYDRATATION : La déshydratation du glycérol est faite à chaud, en présence d'hydrogénosulfite de potassium (KHSO3) et produit de l'acroléine
- ESTERIFICATION : L'estérification du glycérol conduit à des (mono, di ou tri) glycérides.
- AUTRES PROPRIETES : Le glycérol a un goût sucré de puissance moitié moindre que le saccharose, son pouvoir sucrant est de 0,56-0,64 à poids égal13.
Le glycérol a des propriétés laxatives et diurétiques faibles.
Comme d'autres composés chimiques, tels que le benzène, son indice de réfraction (1,47) est proche de celui du verre commun (~1,50), permettant de rendre "invisibles" des objets en verre qui y seraient plongés.
Impression sur matières plastiques
Photostabilité
Structure biaxiale
ThiolsIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of this work was to study the influence of a glycerol derivative with thiol groups, 3,6‐dithia‐1,8‐octanediol (DTO), on light fastness of prints overprinted with water‐based flexographic printing inks. Laboratory printing was performed on various plastic films (BOPP and PE). The effect of a small amount of DTO on printing ink colour was examined by studying the optical density of a full tone area, relative printing contrast and the colour values (CIELAB), and the total colour difference ΔE*ab. Artificial ageing was applied in order to investigate DTO influence on colourfastness of CMY printing inks. Densitometry and spectrophotometric parameters were measured during artificial ageing by irradiation. Additionally, FTIR spectroscopy was used to observe the changes in ink film on printing bases before and after ageing. The print quality of investigated prints is widely discussed. In general, DTO addition influenced the printability of the plastic film and the optical density of a full tone area with an acceptable total colour difference ΔE*ab. Furthermore, printing inks with added DTO exhibited higher optical density and smaller changes of ΔE*ab during artificial ageing. Moreover, the FTIR spectra of printing ink films with added DTO after ageing did not exhibit any perceptible changes in contrast with the original printing ink. Note de contenu : - EXPERIMENTAL : Materials - Preparation and characterisation of inks - Printing - Characterisation of prints - Artificial ageing process - FTIR spectroscopy
- RESULTS AND DISCUSSION : Print quality - Influence of artificial ageingDOI : 10.1111/cote.12315 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12315 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30313
in COLORATION TECHNOLOGY > Vol. 134, N° 2 (04/2018) . - p. 100-105[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19748 - Périodique Bibliothèque principale Documentaires Disponible Improving light fastness of natural dye : photostabilisation of gardenia blue / Hironori Oda in COLORATION TECHNOLOGY, Vol. 128, N° 1 (2012)
[article]
Titre : Improving light fastness of natural dye : photostabilisation of gardenia blue Type de document : texte imprimé Auteurs : Hironori Oda, Auteur Année de publication : 2012 Article en page(s) : p. 68-73 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu de Gardénia
Colorants -- Stabilité
Colorants végétaux
Fibres cellulosiques
Photostabilité
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The photofading behaviour of gardenia blue on cellulose was investigated. A contribution of auto-oxidation and singlet oxygen to that fading was suggested. The inhibiting effect of phenyl ester ultraviolet absorbers towards the photofading of gardenia blue was examined on cellulose. It has been found that the presence of a simple ultraviolet absorber is not of particular value in improving the light fastness of natural dye. The introduction of a singlet oxygen quenching group into an ultraviolet absorber can, however, have an important effect. The nickel complex of 1-benzoyloxynaphthalene-3-sulphonic acid was very effective in reducing the rate of photofading. Note de contenu : - EXPERIMENTAL : Materials - General procedure for photofading of gardenia blue - Assessment of antibacterial activity
- RESULTS AND DISCUSSION : effect of various additives on the photofading of gardenia blue - effect of phenyl ester-type UV absorbers on the photostability of gardenia blue - Effect of UV absorbers bearing the nickel sulphonate group on the light fastness of colour - Antibacterial activity of new stabilisersDOI : 10.1111/j.1478-4408.2011.00324.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00324.x/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13099
in COLORATION TECHNOLOGY > Vol. 128, N° 1 (2012) . - p. 68-73[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13529 - Périodique Bibliothèque principale Documentaires Disponible Improving the fastness properties of thermochromic leathers : the effects of UV absorbent and cross-linkers / Arife Candas Adigüzel Zengin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 5 (09-10/2017)
[article]
Titre : Improving the fastness properties of thermochromic leathers : the effects of UV absorbent and cross-linkers Type de document : texte imprimé Auteurs : Arife Candas Adigüzel Zengin, Auteur ; Eylul Kucukakin, Auteur ; Behzat Oral Bitlisli, Auteur Année de publication : 2017 Article en page(s) : p. 242-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Absorbeurs de rayonnement ultraviolet
Additifs
Colorimétrie
Photostabilité
Pigments à effets spéciaux
Résistance à l'abrasion
Réticulants
ThermochromieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The emerging new applications of thermochromic pigments in leather industry could give a promising opportunity to create innovative designs of smart thermochromie leathers and these leathers are well known with their colour changing effect depending on thermal activation temperature of the thermochromic pigments. A long product his also needed for thermochromic leathers due to the demand for additive use which will enhance the fastness properties of the microencapsulated thermochromic pigments. This study aimed at increasing the light and rubbing fastness values of the leathers that change colour with temperature. Touch (magenta ; 31°C) and cold (blue; 15°C) activated two thermochromic pigments were used in order to provide the colour change of the finished leathers, UV absorbent and Cross-linking chemical additives were used along. with thermochromic pigments in the finishing procedure to increase the fastness properties of the leathers. Colour change features, rubbing and light fastness properties of thermochromic leathers were analyged by a spectrophotometric method in addition to ISO standards of related fastness properties. The use of a UV absorbent in the finishing procedure lead to an increase in the light fastness values of touch and. cold activated therrnochromic leathers. Likewise it was revealed that the use of cross-linker in the top coat of finishing process.improved the rubbing fastness properties of thermochromic leathers. Note de contenu : - Colour measurements of thermochromic leathers
- Fastness properties of thermochromic leathersEn ligne : https://drive.google.com/file/d/1ZrhUEu363ZeuXd_JhEoD124dYFZdDsOG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29239
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 5 (09-10/2017) . - p. 242-249[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19275 - Périodique Bibliothèque principale Documentaires Disponible Improving the photostability of bleached silk without reducing its whiteness / Wang Zongqian in COLORATION TECHNOLOGY, Vol. 131, N° 6 (12/2015)
[article]
Titre : Improving the photostability of bleached silk without reducing its whiteness Type de document : texte imprimé Auteurs : Wang Zongqian, Auteur ; Weiguo Chen, Auteur ; Xuewei Zhou, Auteur ; Chaonan Liu, Auteur ; Keith R. Millington, Auteur Année de publication : 2015 Article en page(s) : p. 439-443 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet
Blanchiment
Chimie textile
Photoabsorption
Photostabilité
Soie et constituantsIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Bleached silk is rapidly yellowed by exposure to the ultraviolet radiation present in sunlight. The conventional application of a water-soluble hydroxyphenyl benzotriazole ultraviolet absorber (such as UVFast W) to bleached silk reduces its rate of photoyellowing but has a negative impact on the whiteness of the bleached silk, largely cancelling out the improvements in whiteness achieved during bleaching. Therefore, a series of bleaching processes and aftertreatments using UVFast W on silk were investigated, with the measurement of reflection spectrum, whiteness, yellowness, and strength before and after exposure to ultraviolet radiation. The results show that whiteness of silk treated by oxidation–reduction double bleaching can be increased, and the whiteness of double-bleached silk with 4% UVFast W aftertreatment was even slightly higher than that of the hydrogen-peroxide-bleached silk. After ultraviolet irradiation, double-bleached silk samples with 4% UVFast W treatment resulted in both the highest whiteness and optimum photostability by comparison with unbleached standard silk and hydrogen-peroxide-bleached silk samples with and without 4% UVFast W treatment, and its strength difference was superior to the samples, except for standard silk with 4% UVFast W treatment after exposure to UV radiation for 18 h. Note de contenu : - EXPERIMENTAL : Materials - Oxidative bleaching with hydrogen peroxide - UVFast W treatment process for unbleached and hydrogen-peroxide-bleached silk - UVFast W treatment from a reductive bleach bath - Photostability testing - Yellowness measurement - Whiteness measurement - Colour measurement - Breaking strength test
- RESULTS AND DISCUSSION : Colour values of silk and hydrogen-peroxide-bleached silk with and without UVFast W treatment - Colour values of double-bleached silk with and without UVFast W treatment - Photostability of silk and bleached silk with and without UVFast W treatmentDOI : 10.1111/cote.12185 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12185 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25090
in COLORATION TECHNOLOGY > Vol. 131, N° 6 (12/2015) . - p. 439-443[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17685 - Périodique Bibliothèque principale Documentaires Disponible Improving the photostability of bleached wool without increasing its yellowness / Keith R. Millington in COLORATION TECHNOLOGY, Vol. 130, N° 6 (12/2014)
[article]
Titre : Improving the photostability of bleached wool without increasing its yellowness Type de document : texte imprimé Auteurs : Keith R. Millington, Auteur ; Michelina del Giudice, Auteur ; Lu Sun, Auteur Année de publication : 2014 Article en page(s) : p. 413-417 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet
Agents de blanchiment
Colorimétrie
Laine
Peroxyde d'hydrogèneLe peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales.
Photostabilité
Résistance au jaunissement
Tests d'efficacitéIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Bleached wool is rapidly yellowed by exposure to the UV radiation present in sunlight. The conventional application of a water-soluble hydroxyphenyl benzotriazole UV absorber (such as UVFast W) to bleached wool reduces its rate of photoyellowing but has a negative impact on the whiteness of the bleached wool, largely cancelling out the improvements in whiteness achieved during bleaching. However, if the UV absorber is applied to peroxide-bleached wool from a reductive bleach bath, white wool with improved photostability to sunlight and UV radiation can be obtained. Note de contenu : - Oxidative bleaching with hydrogen peroxide
- Standard application of UVFW
- Application of UVFW from a reductive bleach bath
- Colour measurement
- Photostability testing
DOI : 10.1111/cote.12109 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12109 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22475
in COLORATION TECHNOLOGY > Vol. 130, N° 6 (12/2014) . - p. 413-417[article]Réservation
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