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Study on reutilization of wet-blue leather wastes for the production of regenerated leather composite / Cheng Qian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 11 (11/2014)
[article]
Titre : Study on reutilization of wet-blue leather wastes for the production of regenerated leather composite Type de document : texte imprimé Auteurs : Cheng Qian, Auteur Année de publication : 2014 Article en page(s) : p. 372-279 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Composites à fibres -- Propriétés mécaniques
Cuirs et peaux -- Déchets -- Recyclage
Déchirure (mécanique)
Extraction (chimie)
Humidité -- Absorption:Eau -- Absorption
Nontissés
Perméabilité
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Polyéthylène téréphtalate
Traction (mécanique)
Viscose
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the possibility of making use of wet-blue leather wastes on a large scale through a nonwoven method was investigated. Firstly, collagen fibers were extracted from the wastes and their structure was characterized. The water absorbency of collagen fibers was tested and compared with that of wool and silk fibers. Then, successfully developed a composite of regenerated collagen fibers on a base layer of PA/PET and viscose fiber, and tested their physical Properties. The results indicated that most of the extracted short collagen fibers existed in bundles, their fibers' lengh were in the range of 25-45 mm, and their finesse was in the range of 2-5?m. The extent of water absorption of collagen fibers was similar to that of wool fiber. The collagen fiber composite on the base layer of PA/PET had good tensile and tearing strength. Moreover, the composite had good moisture permeability with the viscose fibers as a support base layer. Note de contenu : - EXPERIMENTAL PROCEDURES : Properties of extracted collagen fibers - Properties of collagen fiber composites
- RESULTS AND DISCUSSION : Structure of the short collagen fiber - Length of the collagen fibers - Finesse of collagen fibers - Strength of collagen fibers - Water absorbent property of short collagen fiber - SEM on collagen fiber composites - Mechanical properties of collagen fiber compositesEn ligne : https://drive.google.com/file/d/1XkUa7LgLGo3-pyc-jWlCvGjYX7r91QzO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22278
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Code-barres Cote Support Localisation Section Disponibilité 16623 - Périodique Bibliothèque principale Documentaires Disponible Study on the degreasing of sheep skin using subcritical fluid extraction / Qiao Xia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 2 (02/2021)
[article]
Titre : Study on the degreasing of sheep skin using subcritical fluid extraction Type de document : texte imprimé Auteurs : Qiao Xia, Auteur ; Zhang Meina, Auteur ; Bo Mao, Auteur ; Hong Dai, Auteur ; Zongcai Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 39-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux -- Analyse
Cuirs et peaux -- Dégraissage
Cuirs et peaux de moutons
Extraction (chimie)
Peau -- Histologie
Peaux brutes
PentaneLe pentane est un alcane linéaire de formule C5H12.
Le terme pentane désigne aussi par extension abusive17 les trois isomères C5H12 : le n-pentane, le 2-méthylbutane ou isopentane et le 2,2-diméthylpropane ou néopentane. Ces diverses molécules comportent toutes cinq atomes de carbone.
Utilisations : Le pentane est un solvant couramment utilisé en chimie organique.
Propriétés chimiques : Le pentane brûle dans l'air selon la réaction : C5H12 + 8O2 —> 5CO2 + 6H2O (Wikipedia)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Degreasing is one of the important processes for the production of leather and fur. This study aimed to develop a degreasing method using subcritical n-pentane. Sheep skin was chosen as raw skin for this investigation. The best possible combination of degreasing parameters was found using single factor experiment and response surface methodology. The effects of temperature and pressure on the degreasing efficiency were evaluated further with histological analysis. The results showed that the optimum degreasing parameters were a degreasing time of 58 min, pressure of 0.45 MPa, temperature of 41.0°C and thus yielded a degreasing rate of 52.46% theoretically and 51.46% experimentally. Histological sections showed that the degreasing effect of subcritical n-pentane was quite significant and the lipid droplets around the hair follicles were dramatically reduced. It has been proven that subcritical n-pentane degreasing is an effective technique for sheep skin degreasing. Note de contenu : - EXPERIMENTAL : Materials & instruments - Experiment procedure - Sample preparation - Degreasing with subcritical n-pentane extraction - Single factor experiment design of subcritical n-pentane degreasing process - Optimization design of subcritical n-pentane degreasing process by RSM - Characterization of degreasing effect - Histological analysis of degreased skin
- RESULTS AND DISCUSSION : Effect of degreasing
- Table 1 : Single factor experiment scheme
- Table 2 : Factor table for single factor experiment
- Table 3 : Response surface experiment level and coding
- Table 4 : Experimental scheme of response surface methodology and response value of degreasing rate
- Table 5 : Analysis of variance of regression model of subcritical n-pentane degreasing
- Fig. 1 : The sheep skin degreasing procedure with subcritical n-pentane
- Fig. 2 : Single factor results
- Fig. 3 : Residuals
- Fig. 4 : Response surface graph and contour map
- Fig. 5 : Histological photomicrographs of degreased skin under different temeprature
- Fig. 6 : Histological photomicrographs of degreasing skin under different pressureDOI : https://doi.org/10.34314/jalca.v116i2.4234 En ligne : https://drive.google.com/file/d/1fFEfsYfERS70jjgP-KtN7vOTfnm400QO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35307
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Code-barres Cote Support Localisation Section Disponibilité 22600 - Périodique Bibliothèque principale Documentaires Disponible A study on the reliability on UNI EN ISO 17075 method for the determination of the Cr(VI) content in leather / Alberto Ballardin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 12 (12/2013)
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Titre : A study on the reliability on UNI EN ISO 17075 method for the determination of the Cr(VI) content in leather Type de document : texte imprimé Auteurs : Alberto Ballardin, Auteur ; Laura Monica Iannone, Auteur Année de publication : 2013 Article en page(s) : p. 457-461 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Cuirs et peaux -- Normes
Extraction (chimie)
FiabilitéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The UNI EN ISO 17075 method for Cr(VI) detection in leather presents several drawbacks. One of these is the choice of an alkaline extraction pH, which produces severe false positive results.
Summary : The hexavalent chromium content in 14 leather samples, resulted positive to the presence of Cr(VI) according to the UNI EN ISO 17075 method in two certified laboratories, was re-determined, using the official extracting method at pH 8 and a different phosphate extraction buffer at pH 4.4 containing 5% NaCl. The well-known transient nature of Cr6, that is the decrease of its amount in leather during time, required a re-activation by thermal treatment before analysis. The results show that the official method systematically gives false-positive values and that 10 of the 14 examined leather samples, when extracted with a buffer at pH 4.4, proved to have acceptable levels of Cr(VI). In addition we found that Solid Phase Extraction (SPE) cartridges, either normal or end-capped, absorb about 10% of chromate and this indicates that the calibration curves should be obtained after filtering each standard with the SPE employed.Note de contenu : - MATERIALS AND METHODS : Reagents and instruments - Analysis method - Samples
- RESULTS AND DISCUSSION : Comparison of Cr(VI) content in leathers extracted at pH 8 and 4.4 - The yield of filtration with SPE cartridgesEn ligne : https://drive.google.com/file/d/1EZ7Q2b8OmmzqEjMp1xpd0oVg_Pehqfax/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20059
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Code-barres Cote Support Localisation Section Disponibilité 15840 - Périodique Bibliothèque principale Documentaires Disponible Superheated alcohols : lipids from plants / Tony Clifford in PERSONAL CARE EUROPE, Vol. 7, N° 5 (09/2014)
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Titre : Superheated alcohols : lipids from plants Type de document : texte imprimé Auteurs : Tony Clifford, Auteur Année de publication : 2014 Article en page(s) : p. 26-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool
Extraction (chimie)
Extraits de plantes:Extraits (pharmacie)
IsopropanolL'isopropanol ou alcool isopropylique est le nom commun pour le propan-2-ol, composé chimique sans couleur et inflammable dont la formule chimique est CH3CH(OH)-CH3. C'est l'un des deux isomères du propanol (l'autre étant le propan-1-ol). Il est aussi connu sous son nom abrégé IPA (acronyme de l'anglais IsoPropyl Alcohol). Il est obtenu à partir de la réduction de l'acétone par le tétrahydruroborate de sodium.
Un autre procédé de fabrication consiste en une hydratation indirecte du propylène par l'acide sulfurique à 70 %, suivie d'une hydrolyse qui conduit à l'isopropanol.Index. décimale : 668.5 Parfums et cosmétiques Résumé : Superheated alcohols are liquid alcohols under pressure above their boiling points. They are much less polar than they are at room temperature. As a result they can extract lipid materials from biomass. This is often carried out by industrial organic solvents such as hexane. Instead the extraction can be carried out using benign solvents, both from the point of view of the environmental impact and solvent residues in the product. In addition novel compounds of interest can be obtained from a particular biomass. The motivation behind this development was to find environmental solvents, which can extract lipid materials from plant materials. We have experience using superheated water (lqiquid water under pressure above 100 °C) and wrote an article for Personal Care in February 2012. Molecular association by hydrogen bond increases the polarity of a solvent. This is particular the case in liquid water where there is an extensive intermolecular structure. When water is heated, this hydrogen-bond structure breaks up causing a reduction in polarity as measured by the dielectric constant strictly called nowadays the relative permeability. We will call it here by the older term: dielectric constant. The dielectric constant of water is 78 at room temperature and falls to 35 at 200°C. This enables it to dissolve organic molecules if they are slightly polar or polarizable. However, it will not dissolve completely non-polar molecules. We therefore decided to carry out research on superheated alcohols. Alcohols from dimers by hydrogen bonding and these break up at about 125 °C. The break-up of hydrogen bonding is also expected to cause the polarity of ethanol and other alcohols to fall in this temperature region. Thus we would expect some anomalous behaviour in the dielectric constant of alcohols in the region 100 °C to 150 °C. Note de contenu : - System for measurement of the dielectric constant
- Dielectric constant of ethanol
- Dielectric constant of isopropanol
- Laboratory and pilot-scale experimental studiesEn ligne : https://drive.google.com/file/d/1RSRM7KUpjv7gfMUACx4LP1JQhw9r68dR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22013
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Code-barres Cote Support Localisation Section Disponibilité 16487 - Périodique Bibliothèque principale Documentaires Disponible Superheated water : benefits to formulations / Tony Clifford in PERSONAL CARE EUROPE, Vol. 5, N° 1 (02/2012)
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Titre : Superheated water : benefits to formulations Type de document : texte imprimé Auteurs : Tony Clifford, Auteur Année de publication : 2012 Article en page(s) : p. 67-69 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eau
Extraction (chimie)
Extraits de plantes:Extraits (pharmacie)Tags : 'Eau surchauffée' Polarité Extraction Solubilité 'Extraits plantes' Energie Index. décimale : 668.5 Parfums et cosmétiques Résumé : Superheated water is liquid water under pressure at above 100°C. It is much less polar than water at room temperature. As a result it can extract organic compounds. The lower polarity combined with the higher temperature means that extracts are more concentrated and can contain more active compounds. At the same time water is the most benign of extraction media, both from the environmental impact and solvent residues in the product. Note de contenu : - Fall in polarity and enhanced solubility
- Extraction
- Energy considerations
- Laboratory-scale experiments
- Production plants
- Further processingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13398
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Code-barres Cote Support Localisation Section Disponibilité 13662 - Périodique Bibliothèque principale Documentaires Disponible Un survol des techniques de réaction et de séparation fluorées / Dennis P. Curran in L'ACTUALITE CHIMIQUE, N° 4-5 (04-05/2003)
PermalinkSustainability sourced pentylene glycol - a green all-rounder / Nadia Konaté in SOFW JOURNAL, Vol. 142, N° 10 (10/2016)
PermalinkSustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
PermalinkSynthesis and evaluation of a novel shavings-based cationic flocculant / Dai Chunji in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 2 (03-04/2018)
PermalinkSynthesis of a molecularly imprinted polymer to isolate glucosamine from plant extracts by an ionic-non-covalent dual approach / N. Henry in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 37, N° 2 (04/2015)
PermalinkSynthesis of sulfonated Sesamum indicum L. seed oil and its application as a fatliquor in leather processing / Adachukwu N. Nkwor in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
PermalinkTailor-made biomaterials from collagenic wastes in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 5 (05/2011)
PermalinkTamarind shell tannin-doped hybrid sol-gel coatings on mild steel in acidic medium toward improved corrosion protection / Abdullahi Abdulmajid in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
PermalinkTannin analysis of selected plants from Laikipia County, Kenya / Alex Kuria in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 2 (03-04/2016)
PermalinkTanning capacity of Tessmannia burttii extracts : the potential eco-friendly tanning agents for the leather industry / Cecilia R. China in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
PermalinkTanning with pomegranate peel tannin / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 7 (07/2023)
PermalinkTechnology for the production of high-performance textile-grade PA 6 in CHEMICAL FIBERS INTERNATIONAL, Vol. 67, N° 3 (09/2017)
PermalinkTechnology for the production of high-performance textile-grade PA 6 in CHEMICAL FIBERS INTERNATIONAL, (10/2018)
PermalinkPermalinkTextiles. Dosage du formaldéhyde / International Organization for Standardization (Genève, Suisse) / Geneve [Switzerland] : International Organization for Standardization (ISO) (1999)
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