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Acrylic syntans - versatile tanning materials / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
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Titre : Acrylic syntans - versatile tanning materials Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; Charles R. Sigafoos, Auteur Année de publication : 1975 Article en page(s) : p. 481-497 Note générale : Appendix - Bibliogr. Langues : Américain (ame) Catégories : Chaussures
Cuirs et peaux de porcs
pH
Polyacryliques
Prétannage
QuebrachoLe quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches.
Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ;
Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae.
Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache.
Retannage
Syntans
Tannage au chrome
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage synthétique
Tannage végétal
Tige de la chaussure
VêtementsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic resins have been utilized for decades in the finishing of leather, and literature references are available for their use in finishing and in retanning processes. There is little in the current literature, however, on acrylic syntans for use in tanning or retanning, although such products have been available commercially since the early 1960's. In 1966, a Netherlands patent and, in 1969, a United States patent were issued covering the basic composition and use of an acrylic polymer prepared in the presence of a sulfated oll for use in the preparation of leather. A paper read at the Northampton group of the SLTC covered the known properties of one of these novel retanning materials. More recently, a patent was issued to cover copolymers of unsaturated acids and quaternized tertiary amines, although products of this type are not normally available. Note de contenu : - USE OF ACRYLIC SYNTAN WITH CHROME TANNING : As a chrome exhaust aid - As a pretannage
- USE OF ACRYLIC SYNTAN IN RETANNING OF CHROME LEATHER : Review of precious work - Effect of pH to control deposition - Buffered retannages - Combination retannages with vegetable extract
- CURRENT RETANNAGES FOR VARIOUS LEATHERS
- Table 1 : Acrylic syntan - typical values
- Table 2 : Syntan influence on chrome exhaustion
- Table 3 : Acrylic syntan compared as pretan or retan
- Table 4 : Acrylic syntan pretan in salt-free pickle chrome content of leathers
- Table 5 : Effect of pH of retannage on leather properties
- Table 6-A : Effect of buffers on leather properties
- Table 6-B : Effect of buffers on leather properties
- Table 7 : Acrylic syntan in combination with vegetable
- Table 8 : Buffered acrylic plus quebracho retannage
- Table 9 : Buffered retannage for white, full grain side leather
- Table 10 : Soft pigskin for garment leather
- Table 11 : Retannage for white pigskin
- Table 12 : Retannage for shoe side upper leather
- Table 13 : Retannage for softy shoe or bootEn ligne : https://drive.google.com/file/d/1tJOg67zIbIoqEV2WZUuL8IAHhtGEvESE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38793
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 481-497[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008509 - Périodique Archives Documentaires Exclu du prêt Chrome free tanning compositions and processes / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 2 (02/2003)
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Titre : Chrome free tanning compositions and processes Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; Marcel Siegler, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2003 Article en page(s) : p. 63-69 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Totally organic tannages that start with an aromatic composition that lends itself to secondary reactions or crosslinking are one approach to the reduction or elimination of chrome as the primary tanning agent for leather. Our approach was to focus on the preparation of low molecular weight methacrylic acid copolymers with methacrylate comonomers in order to maintain a rigid-rod structure with functional groups extending from the rod. In one series we developed polymerization procedures with an aminomethacrylate monomer, to impart cationic functionality to the tanning molecule, and hydroxyethylmethacrylate to provide hydroxyl functionality for the second stage reaction. In another series, methacrolein was the only comonomer thus providing aldehyde functionality for the second stage reaction. For evaluation shrinkage temperatures were measured before and after the addition of crosslinking agents to the experimentally tanned stock. The best result for the hydroxyl functionality was 86°C obtained with glutaraldehyde, while for the aldehyde functionality the best result was 84°C obtained with oxazolidine. While lower than shrinkage temperatures obtained with chrome tanning, these values are high enough for automotive upholstery leather. Samples of these systems were retanned with a typical upholstery formulation and evaluated. These leathers met the physical requirements for automotive leathers, but we feel the retanning formulations and polymer compositions would need adjustments to improve color matching and to be certain the fatliquors are suitable for fogging tests. En ligne : https://drive.google.com/file/d/1PZLzZqy_mgDIcA6VIIdb2t9h63qe6U9E/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4095
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Code-barres Cote Support Localisation Section Disponibilité 001583 - Périodique Bibliothèque principale Documentaires Disponible High performance acrylic resins / J. J. Biles in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIX (Année 1984)
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Titre : High performance acrylic resins Type de document : texte imprimé Auteurs : J. J. Biles, Auteur ; Nicholas J. DiCandilo, Auteur ; William C. Prentiss, Auteur Année de publication : 1984 Article en page(s) : p. 34-44 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The availability of acrylic resins for the manufacture of leather dates back well over fifty years. Some of the earliest acrylics developed for the base coating of leather are still in use today, a tribute to the performance capabilities achieved through acrylic technology. In the last decade, as new technology was developed, new products such as ultra-fine impregnation resins, ambient cure base coat resins, and water reducible topcoats have appeared. In this paper, some of the more recently developed materials for the finishing of leather are described with emphasis on the performance of soft, but tough acrylic basecoat emulsions. They offer a superior balance of elasticity/tensile strength with freedom from tack normally associated with typical basecoat resins. Also covered are acrylic topcoat materials which are comparable to nitrocellulose lacquer emulsions in application performance and physical requirements. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9347
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Code-barres Cote Support Localisation Section Disponibilité 008084 - Périodique Bibliothèque principale Documentaires Disponible High performance acrylic resins for leather - 2 acrylic topcoating systems / J. J. Biles in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
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Titre : High performance acrylic resins for leather - 2 acrylic topcoating systems Type de document : texte imprimé Auteurs : J. J. Biles, Auteur ; Nicholas J. DiCandilo, Auteur ; William C. Prentiss, Auteur Année de publication : 1987 Article en page(s) : p. 65-71 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel prototype, second generation acrylic topcoat system was described in a previous technical presentation. Since that time the growing demand for aqueous based topcoat products due in particular to lower solvent emission requirements by local municipalities has made traditional water dilutable emulsion topcoats unacceptable for many topcoating purposes. The scope of this paper identifies a family of safe, non-toxic acrylic emulsion topcoats offering a range of performance properties and favorable economics which are applicable to the softer leathers of today's leather market and which meet today's safety requirements. Their key properties feature attractive product characteristics such as low emissions and non-combustibility as was as numerous application and finished leather benefits. They offer flow/leveling and drying properties which make them suitable for conventional spray application and application by roll coater. En ligne : https://drive.google.com/file/d/1vXr_VgG5L9s_rw7bvt090FrlWdmIiLBQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8972
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Code-barres Cote Support Localisation Section Disponibilité 008087 - Périodique Bibliothèque principale Documentaires Disponible Improved chrome utilisation in chrome tanning / William C. Prentiss in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
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Titre : Improved chrome utilisation in chrome tanning Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; I. V. Prasad, Auteur Année de publication : 1982 Article en page(s) : p. 32-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Déchets -- Réduction
Masquage
Mesure
pH
Produits chimiques -- Consommation -- Réduction
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In a recent article Smith notes that emphasis on environment, health, and energy conservation has led to new studies to increase the efficiency of chromium usage in a tannery. He cites four basic concepts for increasing efficiency, these being improved uptake, recycling chrome liquors, precipitation and recovery of chrome for reuse and alkaline incineration. Utilising various techniques, all of the first three are practical commercially, while the fourth is being studied seriously from both chrome recovery and solid waste disposal perspectives. Since the first disclosure of a practical chrome tanning process in 1858 there have been literally hundreds of publications about the chemistry and technology of chrome tanning. It is estimated that about half relate to improved chrome uptake, but they can be classified into four main categories. These are control of pH, selection of masking agents, control of time and temperature, and control of float (or concentration).
pH control does not necessarily mean increasing the pH at the end of chrome tanning by adding more neutralising agent. It does include employing more modern techniques such as adding magnesium oxide, a sparingly soluble basifying agent, for control of neutralisation ; or a combination of conventional and self-basifying chrome ; or even a chelated chrome added immediately following the bate. Selection of masking agents can be very critical. The more conventional formate and acetate masking can lead to more rapid arome penetration, while the more complex, polybasic acids which affect the size of the chrome complex can decrease penetration but improve fixation. Time, temperature and control of float are all rational and interrelated. Since chrome tanning is both a physical (diffusion) and a chemical (reaction) process which ultimately leads to an equilibrium situation, any condition which achieves equilibrium more rapidly or at equilibrium increases the quantity of total fixed chrome relative to the total unfixed chrome will improve uptake. The conditions are, of course, low float, higher temperature and longer running times.
It is now possible to add a fifth category to the techniques for improved chrome uptake. Although currently there is insufficient evidence to establish the mechanism of action, it is apparent that a class of chemicals has been discovered, broadly defined as amine salts, which shifts the equilibrium of chrome between stock and float such that more chrome is exhausted in the stock and less remains in the exhaust liquor. This paper describes the results of our laboratory programme to determine the effect of process variations and define an optimum process for tannery trials. The results of confirmatory tannery trials are also reported.Note de contenu : - EXPERIMENTAL : Tanning process - Measurements
- RESULTS AND DISCUSSION : Effect of reduced chrome - Effect of chrome exhaust aid level - Effect of pickle pH - Effect of masking - Effect of stock pH after neutralisation - Addition of exhaust aid with the chrome compared with addition before the chrome - Proposed optimised processEn ligne : https://drive.google.com/file/d/1Xq6Amudrel-rlxTG9vUNEZYcPehDW-wa/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34208
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Code-barres Cote Support Localisation Section Disponibilité 007129 - Périodique Bibliothèque principale Documentaires Disponible Improved chrome utilization in chrome tanning / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
PermalinkImproved chrome utilization in chrome tanning. II. Process variables affecting chrome exhaustion / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
PermalinkIsothiazolones for leather preservation. II. Military leather / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIV (Année 1979)
PermalinkPractical leather processes using the novel pretan concept / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
PermalinkPractical leather processing using the novel pretan concept II. results of tannery trials on side upper leather / J. J. Hodder in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIX (Année 1984)
PermalinkThe characterization of acrylic syntans for retanning chrome leather / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
PermalinkThe role of acrylics in pigskin processing / William C. Prentiss in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 2 (03-04/1979)
PermalinkViscosity parameters of finishes applied by roll & precision coating / J. Biles in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXX (Année 1985)
PermalinkWhat's adhesion / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIII (Année 1988)
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