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Theoretical and practical aspects of polar interactions between hide collagen and aqueous media in curing and tanning / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 54, N° 12 (12/1970)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS > Vol. 54, N° 12 (12/1970) . - p. 417-429 Titre : Theoretical and practical aspects of polar interactions between hide collagen and aqueous media in curing and tanning Type de document : texte imprimé Auteurs : Alan E. Russell, Auteur ; Desmond R. Cooper, Auteur Année de publication : 1970 Article en page(s) : p. 417-429 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs Cuir -- Séchage Dynamique moléculaire Imperméabilisation Tannage végétal Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Recent fundamental studies in these laboratories have been concerned with the range of relatively weak, reversible interactions, generally termed "polar" interactions, which occur between hide collagen and its aqueous environment. These studies have provided further insight into the factors governing this reactivity. The interaction has wide significance in determining solubilities and properties of solutions, the solution structure of proteins as well as the interaction of hide collagen with technological materials such as vegetable tannins, dyestuffs and water-proofing agents. Hence, greater understanding of the basic processes involved is a prerequisite for rationali-sation and improvement in the technological operations of curing and tanning. In this review, the mechanism of polar interaction indicated in fundamental studies is outlined and some areas of practical application discussed, including the use of polar additives as penetration assistants in vegetable tannage and the application of polar molecules carrying long-chain hydrocarbon structures in waterproofing treatments for leather. Note de contenu : - BASIC STUDIES : Nature of non-covalent interactions in solution - Factors in collagen stabilisation - Factors in solvent lyotropic activity - PRACTICAL SIGNIFICANCE OF POLAR INTERACTIONS - POLAR INTERACTIONS IN PENETRATION-ASSISTED VEGETABLE TANNAGE : Polar binding of waterproofing agents - Table 1 : Relative lyotropic activities of a range of polar compounds Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35670 [article]

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One shot chrome tannages / J. C. Bickley in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 54, N° 12 (12/1970)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS > Vol. 54, N° 12 (12/1970) . - p. 431-442 Titre : One shot chrome tannages Type de document : texte imprimé Auteurs : J. C. Bickley, Auteur ; H. Lee, Auteur ; J. B. Whitton, Auteur Année de publication : 1970 Article en page(s) : p. 431-442 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie) Carbonate de sodium Le carbonate de sodium est un composé chimique ayant pour formule Na2CO3. Il s'agit d'un sel de sodium de l'acide carbonique. Dans le langage courant, on parle aussi de soude ou de cristaux de soude, à cause de son contenu en sodium et de sa forme habituellement cristalline. Par contre, il ne faut pas confondre le carbonate de sodium avec la soude caustique ou encore avec le bicarbonate de soude. Cuirs et peaux -- Analyse Mélanges (chimie) Naphtalène Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : After reviewing published methods of shortening and simplifying the chrome tanning process, the elimination.of the basification stage was chosen for further investigation. Firstly, the rates of reaction between freshly prepared solutions of chrome powder and various added basifying agents was determined. As a result of these findings, a number of bases were selected for further trials in laboratory scale tannages carried out on hide pieces. To obtain satisfactory penetration and even distribution of chrome, a short pickle was found to be essential. However, using these short float powder tannages, the importance of hide location was found to be more marked than in a conven-tional tannage and this made difficult the interpretation of the results obtained. For the final assessment, therefore, matched sides were used for com-parison with a conventional system. A chemical and physical analysis of the leather was carried out in addition to a subjective assessment. All the leathers produced were judged to be commercially acceptable but the following powder systems appeared to give superior results to the conventional long float method using chrome liquor : - I : A commercially available self-basifying chrome powder - II : A mixture of chrome powder and "Whiting" - III : A mixture of chrome powder, soda ash and neutral naphthalene syntan Note de contenu : - Table 1 : Analysis of basifying materials - Table 2 : Analysis of leather from experiment 2 - Table 3 : Analysis of leather from experiment 3 - Table 4 : Analysis of Finished Leather from Experiment 4 - Table 5 : Subjective assessment of finished leather from experiment 4 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35671 [article]

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