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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CVIII, N° 7Mention de date : 07/2013Paru le : 10/07/2013 |
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Ajouter le résultat dans votre panierUtilization of tannery solid waste : Dry strength additive for papermaking / Yaohui You in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
[article]
Titre : Utilization of tannery solid waste : Dry strength additive for papermaking Type de document : texte imprimé Auteurs : Yaohui You, Auteur ; Yunhang Zeng, Auteur ; Yishan Liu, Auteur ; Bi Shi, Auteur ; Xuepin Liao, Auteur Année de publication : 2013 Article en page(s) : p. 250-256 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs
Ammonium
Cations
Collagène
Cuirs et peaux -- Déchets -- Recyclage
Hydrolysats de protéines
Papier
Papier -- Propriétés mécaniques
Procédés de fabrication
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An approach of utilizing tannery solid waste was developed by using untanned solid waste as raw material to prepare a dry strength additive for papermaking. Cationic derivatives of collagen hydrolysate (C-CHs) were prepared by incorporating (2,3-epoxypropyl) trimethyl ammonium chloride into collagen hydrolysates with different molecular weights. C-CHs were employed in sheet formation for enhancing physical properties of hand-sheets, and the results indicated that C-CHs were useful in tap water and white water to improve the tensile strength and folding endurance of the hand-sheets. This should be due to the fact that C-CHs with cationic moieties are prone to be retained in anionic cellulose fibers, which is beneficial for the formation hydrogen bonds among hydroxyl groups in the cellulose fibers. Note de contenu : - EXPERIMENTAL : Materials - Preparation of CHs with different molecular weights - Cationization of CHs to obtain C-CHs - Effectiveness of C-CHs in sheet formation
- RESULTS AND DISCUSSION : characteristics of C-CHs - Effectiveness of C-CHs in sheet formationEn ligne : https://drive.google.com/file/d/11rFGXylHlX9eyLITVAEw2vFxg9Y-XQvX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19009
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 7 (07/2013) . - p. 250-256[article]Réservation
Réserver ce documentFerrous-gluconic acid compound tanning : a cleaner chrome-free tanning system / Yang Mao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
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Titre : Ferrous-gluconic acid compound tanning : a cleaner chrome-free tanning system Type de document : texte imprimé Auteurs : Yang Mao, Auteur ; Yi Jie, Auteur ; Shan Zhi-Hua, Auteur ; Chen Hui, Auteur Année de publication : 2013 Article en page(s) : p. 257-265 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique
Cuirs et peaux -- Propriétés mécaniques
Gluconique, AcideL'acide gluconique (C6H12O7) est un acide très répandu aussi bien chez les animaux que dans les plantes. Il est le plus souvent intégré dans une molécule plus grande comme c'est le cas dans diverses gommes. Il est obtenu à partir de la gomme d'acacia, à partir de laquelle on l'isole sous la forme de cristaux en aiguilles fondant à 165 °C. Il est soluble dans l'eau et l'alcool. Il est autorisé en Europe comme additif alimentaire (E5748).
Ions fer
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminiumIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to evaluate the reaction mechanism between Fe2+-gluconic acid compound and collagen, the combination tanning of type-I collagen with Fe2+-gluconic acid compound was studied by UV-Vis spectroscopy, infrared spectroscopy, circular dichroism, and differential scanning calorimetry. The molar ratio for the reaction between Fe2+ and gluconic acid was 1:3. The resulting increased thermal stability could be attributed to crosslinks formed between the compound and collagen. The tanning trials indicated favorable results. The shrinkage temperature observed was 96°C, with tensile strength of about 239 kg/cm, elongation at break of about 63% and tear strength of about 74 kg/cm. The leather tanned with the Fe2+-gluconic acid compound was lighter in color compared to the single ferrous sulfate (Fe(II)) tanning system, and had neither a darkening of color nor a reduction in strength properties. It was also clear that COD and TS loads were decreased by 26.5% and 29.8%, respectively compared to Fe(II) system, 7.3% and 26.1%, respectively, compared to BCS system. Studies show that the disadvantages connected with Fe(II) tanning system including loss of strength and darkening of color have been solved successfully. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the Fe2+-glucnic acid compound - UV-Vis spectral studies - FT-IR spectra - Elemental analysis - Viscosity measurements - CD spectroscopy - DSC determination - Tanning trials - Analysis of strength characteristics - Spent tan liquor analysis
- RESULTS AND DISCUSSION : UV-vis spectral studies - FT-IR studies - Elemental analysis - Viscosity analysis of the collagen-Fe2+-gluconic acid system - CD studies - DSC studies - Physical properties analysis of leathers - Spent tanning liquor analysisEn ligne : https://drive.google.com/file/d/1TTrHv9Q4Ceid9uZIuiBo1ApYG2CsL0EW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19010
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 7 (07/2013) . - p. 257-265[article]Réservation
Réserver ce documentEffects of atmospheric pressure plasma treatments on various properties of leathers / Safiye Meric Acikel in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
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Titre : Effects of atmospheric pressure plasma treatments on various properties of leathers Type de document : texte imprimé Auteurs : Safiye Meric Acikel ; Ahmet Aslan ; Lufti Oksuz ; Taner Aktan Année de publication : 2013 Article en page(s) : p. 266-276 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Argon
Colorants acides
Colorimétrie
Complexes métalliques
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Teinture
Déchirure (mécanique)
Frottements (mécanique)
Hydrophilie
Plasma à pression atmosphériqueUn plasma à pression atmosphérique (ou plasma à PA ou plasma froid) est le nom donné à une catégorie spéciale de plasma pour lequel la pression approche celle de l’atmosphère.
Le plasma à pression atmosphérique marque une nette différence avec le plasma basse et haute pression. En effet, contrairement à ces derniers aucune enceinte de traitement n'est nécessaire. Ce type de plasma peut donc être utilisé directement sur ligne de production, évitant ainsi l'utilisation de vide qui est extrêmement onéreuse.
Traction (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chrome tanned crust leathers were treated with atmospheric pressure plasma with argon flows at different times. The leather was then dyed with acid and metal complex dyes. The dyestuff concentration in the exhausted dye bath, CIE lab color analysis, hydrophilicity, FTIR spectra and SEM images were compared for 0, 2.1, 4.2 and 6.4 sec/cm2 durations of plasma. In addition, various physical properties such as rubbing fastness, tear loading and tensile strength were also examined to see the effects of increased duration of the plasma process. The presence of ions that appeared during this process in an atmospheric environment was determined by OES. The best results were obtained from leather subjected to 6.4 sec/cm2 of argon gas atmospheric pressure plasma. Note de contenu : - MATERIALS
- METHODS : Leather processing - Experimental set up - The dyeing process - Optical emission spectrometer analysis - FTIR measurements - Hydrophilicity measurements - Dyestuff concentration in the exhausted dye bath - CIE L* a* b* color measurement - Rubbing fastness - Tensile strength and tear load tests - Scanning electron microscope study
- RESULTS AND DISCUSSION : Optical emission spectrometer - FTIR - Hydrophilicity - Dyestuff concentration in the exhausted dye bath - CIE L* A* B* color - Rubbing fastness - Tensile strength and tear loas assessment - SEM photographsEn ligne : https://drive.google.com/file/d/1AIzopPZI4YDw6suYQBO90r0nL1_e2Lp8/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19011
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 7 (07/2013) . - p. 266-276[article]Réservation
Réserver ce documentUltrasound-assisted process intensification in leather making : diffusion rate enhancement in retanning process / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
[article]
Titre : Ultrasound-assisted process intensification in leather making : diffusion rate enhancement in retanning process Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; P. T. Anusha, Auteur ; Radhika Narayan, Auteur ; M. Shravya, Auteur Année de publication : 2013 Article en page(s) : p. 277-287 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Cuirs et peaux
Cuirs et peaux -- Finition
Diffusion (physique)
Granulométrie
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Phénols
Polyacryliques
Retannage
Statistique
Syntans
UltrasonsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Retanning is one of the essential steps in leather processing. It follows the primary tanning process, utilizing synthetic tanning agents (syntans) in order to impart certain functional properties to the final leather. This research study aimed at investigating the effect of ultrasound (US) on the uptake of syntans in the retanning process as compared to magnetic stirring (MS) process control. Different types of syntans based on phenolic, melamine resin and acrylic compound were investigated. The influence of process parameters such as US power, process time, float, syntan offer, US pulse mode were studied. The effects of pre-sonication of substrate (leather) as well as substance (syntan solution though particle size analysis) were also investigated. There was the possibility of about 10% to 60% increase in exhaustion due to the use of US over MS for different syntans under various process conditions. The Apparent Diffusion coefficient (D) of syntan through the leather matrix was calculated from the experimental uptake data, which indicates significant improvement (~1.5 times) in the D value due to US over MS under the given process conditions. Therefore, the present study clearly indicates positive influence of ultrasound on diffusion of these special types of organic compounds (syntans) through more complex porous matrix such as leather, leading to significant improvements in diffusion rate of syntans, considerable savings in process time and subsequent enhancement in the quality of retanned leathers. Note de contenu : - Ultrasound in leather application
- Experimental set-up
- Process details (all the % based on shaved wet-blue weight) - Analytical procedure
- Calculation of process intensification parameters enhancement in uptake of retanning agents
- Diffusion co-efficient of syntans through leather matrix
- Effect of process parameters, effect of ultrasound and type of syntan on uptake on syntan
- Effect of ultrasound on apparent diffusion coefficient of syntans - Effect of ultrasound on substrate : pre-sonication of leather
- Effect of ultrasound on substance : particle-size analysis of syntans - Effect of ultrasound pulse mode
- Effect of combination of syntans
- Effect of retanning with two pieces
- Effect of ultrasound and type of syntan on uptake on syntan (a. phenolic syntan, b. melamine resin syntan, c. acrylic syntan)
- Statistical analysisEn ligne : https://drive.google.com/file/d/1nEKS3fHXRhiWa_xxak8YLWRhXXNFjYET/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19012
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 7 (07/2013) . - p. 277-287[article]Réservation
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