Glyoxylic acid : an interesting contribution to clean technology / Karlheinz Fuchs in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 1 (11/1993)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVIII, N° 1 (11/1993) . - p. 402-415 Titre : Glyoxylic acid : an interesting contribution to clean technology Type de document : texte imprimé Auteurs : Karlheinz Fuchs, Auteur ; Rainer Kupfer, Auteur ; John W. Mitchell, Auteur Année de publication : 1993 Article en page(s) : p. 402-415 Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In nearly all countries on earth the protection of the environment has become increasingly a very serious concern. As a result, those producing idustrial and consumer products must strive to reduce environmental strain. Main causes of concern for tanners are the chrome-containing effluents from chrome tanning, washing, neutralization, retanning, and dying. These have been studies in Hoechst and the authors are pleased to now present a constructive solution: a glyxylic acid pickling process for chrome tanning that considerably reduces the chronium content of tannery effluents (extraordinary fixation, minuscule leaching). It is already well established in many tanneries in Germany, Europe and other parts of the world. Glyoxylic acid becomes an aid to tanning by converting amine groups in collagen to carboxyl groups, creating additional sites for chrome to combine with the collagen, witch causes the chrome offered to be better exhausted and more strongly fixed than a conventional tannage. Advantages of the glyoxylic acid pickle include: exceptional chrome exhaustion; leaching is drastically reduced during wringing, washing, and retanning; conventional chrome tanning salt is used; chrome is offered at a reduced level; grain wrinkles level; and it is liquid for automated feed systems. En ligne : https://drive.google.com/file/d/1obRwOG5evU3usqEg3-S-XQMtJdZfuX-Q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8143 [article]

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Silicone dioxyde : environmentally friendly alternative for wet white manufacture / Karlheinz Fuchs in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 6 (06/1995)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXX, N° 6 (06/1995) . - p. 164-176 Titre : Silicone dioxyde : environmentally friendly alternative for wet white manufacture Type de document : texte imprimé Auteurs : Karlheinz Fuchs, Auteur ; Rainer Kupfer, Auteur ; John W. Mitchell, Auteur Année de publication : 1995 Article en page(s) : p. 164-176 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Silicon and oxygen are the most abundant elements on earth. When chemically combined they form naturally occuring silicon dioxyde and silicates with widely differing structures. Minerals found in nature and based on these elements are numerous. Silicates have been widely used in technical applications for a long time. Pure silicon as a material for electronic components laid the foundations of the computer age has had a crucial influence on our era. In leather manufacture, by contrast, the silicon compounds have so far been of only minor importance. With the development of a specific colloidal aqueous suspension of silicon dioxyde gel, a major step has been taken toward making this class of substances accessible to and usable in leather manufacture. This compound enables pelts to be processed into wet white, a stabilized hide material that can be subjected to mechanical operations and then can be subjected to mechanical operations and then to any kind of tanning. the hide waste producted in splitting, shaving, and trimming is free from environmentally polluting chemicals and presents no problems in disposal or recycling. Since the collagen is hardly altered by silica (unlike wet white processed with tanning agents that affect the collage fibre structure), subsequently tanned hides retain their charactéristic properties and undergo no adverse changes. This also means no restrictions need be placed on the collagen offal of trimming and shaving, which expands the array of their possible uses and value in the market. Note de contenu : - INTRODUCTION : In the beginning ... the claims - Environmental audit - Wet white economics - EXPERIMENTAL : Silicon dioxide wet white system - Health and toxicity - Stability of the dispersion - RESULTS AND DISCUSSION : Influence of pH - Interaction of feliderm W with collagen - Does it tan ? - Further work - How to tan the ECO leather En ligne : https://drive.google.com/file/d/18sl4hEUCFj5nc-4xIxu6o9xqmmZr-wyd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7941 [article]

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