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Mention de date : 11/2008
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Ajouter le résultat dans votre panierElastiticy studies on leather retanned with various types of acrylic polymers / Jianzhong Ma in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 11 (11/2008)
Titre : Elastiticy studies on leather retanned with various types of acrylic polymers Type de document : texte imprimé Auteurs : Jianzhong Ma, Auteur ; Hua Lu, Auteur Année de publication : 2008 Article en page(s) : p. 363-369 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Different acrylic polymer retanning agents were synthesized with acrylic acid as the primary monomer and eight other acrylate monomers (MAA-methyl acrylic acid, EA-ethyl acrylate, BA-butyl acrylate, VAc-vinyl acetate, MA-methyl acrylate, AM-acrylamide, IA-Itaconic acid, HEA-2-hydroxyethyl acrylate) as commoners. The eight copolymers were applied in the retanning process separateley and the elasticity of the resultant leather was discussed. The results showed that the leather elasticity could be tested by calculating young's modulus of the elastic deformation, which ws a variable region on the load-displacement curve, and young's modulus of the elastic deformation could serve as an independent parameter in characterizing leather's physical properties. The relation between the elasticity and the dosage of copolymer was discussed, and it revealed that every comonomer had a proper dosage at which level the resultant leather showed the lowest young's modulus. Then the effects of the eight comonomers on leather elasticity were compared under the same condition. It showed that the soft comonomers, BA and EA, contributed more in leather elasticity than other selected comonomers. En ligne : https://drive.google.com/file/d/1M03xfreplpgebWEsh1KSuRfyOjukyXzr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3022
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 11 (11/2008) . - p. 363-369[article]Réservation
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Titre : Electrochemical oxidation and reuse of pickling wastewater from tanneries Type de document : texte imprimé Auteurs : S. Sundarapandiyan, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Sathya Ramalingam, Auteur ; M. C. K. Dhanaselvan, Auteur ; G. Rajeswari, Auteur Année de publication : 2008 Article en page(s) : p. 370-376 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Reuse of pickling wastewater after treating it electrochemically has been studied. Pickling wastewater has been neutralised to pH 7.0 and subjected to electrooxidation. electrooxidation has been carried out using graphite electrodes at a current density of 0.012 A/cm2 for 2 hrs. Pickling wastewater has been analysed prior to and after the treatment. Treated wastewater has been reused and the cycle continued for seven times. The pickled pelts were chrome tanned and further converted into crust leathers. Shrinkage temperature, chromium uptake and chromium distribution of wetblue were tested. Crust leathers were tested for physical chrateristics. Characteristics of treated pickling wastewater indicated that electrooxidation reduced the pollution load in terms of COD and TKN significantly. Results indicated that the recycling did not influence the characteristics of wetblue and crust leathers. En ligne : https://drive.google.com/file/d/1pKcBpKpTSRF0WGazL5Q7fREOTfKvveX7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3023
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 11 (11/2008) . - p. 370-376[article]Réservation
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Titre : Tanning effects of aluminum -genipin or -vegetable tannin combinations Type de document : texte imprimé Auteurs : Keyi Ding, Auteur ; Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2008 Article en page(s) : p. 377-382 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Fixateurs (chimie)
Génipine
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Genipin, a naturally occurring protein crosslinking agent, isolated from the fruit of Gardenia jasmindides Ellis, is beginning to replace glutaraldehyde as a fixative for biological tissues. Earlier research in this laboratory demonstrated that when hide powder was first tanned with 8% aluminum and retanned with (2% to 10%) genipin, the thermal stability increased linearly with increasing concentrations of genipin, suggesting the possibility that a practical combination tannage based on genipin could be designed. When pieces of bated hide were pretanned with 6% aluminum, then split and tanned with 6% genipin based on the split wet-white pelt weight, the hydrothermal stability was about 89 deg C as determined from the onset of the melting curve in a differential scanning calorimetry (DSC) experiment, or shrinkage T = 92 deg C by a traditional shrinkage temperature measurement. Values for the physical-mechanical properties were similar to those measured for aluminum-glutaraldehyde and mimosa-aluminum leathers prepared, as controls, under equivalent conditions. By subjective evaluation, the appearance of aluminum-genipin tanned leather was rated 4 on a scale of 1 to 5, and the leather was more stable to washing than were control leathers. These results suggest the potential for development of practical genipin-based tannages. En ligne : https://drive.google.com/file/d/10bvMNtk7jkcWyvg8_Nys_Co_S3dsJC4S/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3024
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 11 (11/2008) . - p. 377-382[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010839 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Recent developments in the short-term preservation of cattle hides Type de document : texte imprimé Auteurs : Dean Didato, Auteur ; George Stockman ; Susan Steele, Auteur Année de publication : 2008 Article en page(s) : p. 383-392 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Every year substantial dollar losses inhide value occur in the United States that are directly attributable to the combined effects of hide autolysis and bacterial degradation. Much of this value could be recovered through the effective application of short-term preservation chemicals immediately after slaughter. Two areas of critical importance for recoverig hide value are inrural (i.e., small sources such as farms or local butchers) hide collection and inscheduling the processing of fresh hides. A two to three day delay in curing is to known adversely affect grain quailty on rural collection hides, especially in hot weather. Even good quality packer hides delayed in delivery or just delayed in process over a weekend can result in a loss of grain quality.
To adress these needs, we have evaluated a wide range of generally regarded as safe (GRAS) and non-GRAS preservation treatments. Collagenase inhibitors have been incorporated to reduce grain damage from autolysis as well as damage from bacterial enzymes post-slaughter. Thus, we were able to extend the "shelf-life" of fresh hides by three to six days and prevent loss in hide value.
Several GRAS and non-GRAS chemical combinations achieved the desired results during bench scale testing and the data obtained will be discussed. Larger scale field-testing is in progress and details on these trails will be presented.En ligne : https://drive.google.com/file/d/1Fm4h0De06fq2qnxeEpbv5KhcwU2O53Ej/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3025
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 11 (11/2008) . - p. 383-392[article]Réservation
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Titre : Carbodiimides in leather finishing II : recent advances Type de document : texte imprimé Auteurs : L. C. J. Hesselmans, Auteur ; A. J. Derksen, Auteur ; W. Posthumus, Auteur ; J. Levy Année de publication : 2008 Article en page(s) : p. 393-395 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The first paper in this series outlined the then-known chemistry of water-dispersible polycarbodiimides and demonstrated conclusively their utility for leather finishing, but at the same time revealed unexpected gaps in some of the chemical detail.
This presentation represents an update to an important leather industry audience and is one more in what is a longer series devoted to developing consensus understanding of the chemistry and benefits that accrue to the use of polycarbodiimide crosslinkers for specialty coatings. The search for continued performance imporvement in the most demanding areas of leather finishing continues, and the thrust of this paper and others in the series is to promote amore precise understanding of the complex chemistry of polycarbodiimides, to distill out from that larger chemical picture what reactios are most likely and deserve further study, and to ally that knowledge with what is taught by experience for the purpose of proposing, explaining, and justifying how best to use them to produce more cost-effective performance outcomes for the leather finisher.En ligne : https://drive.google.com/file/d/1UgcgDT74GSvVwt8DdK7lKwk6kot6AatJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3026
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| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 010839 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
