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Leather coated with mixtures of humectant and antioxidants to improve ultraviolet and heat resistance / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 5 (05/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 5 (05/2009) . - p. 161-168 Titre : Leather coated with mixtures of humectant and antioxidants to improve ultraviolet and heat resistance Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Renée J. Latona, Auteur ; Nicholas P. Latona, Auteur ; Mila Aldema-Ramos, Auteur Année de publication : 2009 Article en page(s) : p. 161-168 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ultraviolet (UV) and heat resistance are very important qualities for leather products. We recently developed an environmentally friendly finishing process for improving the UV- and heat resistance of chrome-free leather. We previously reported and demonstrated some promising results from coating tocopherol, a natural antioxidant, onto the grain layer of leather. Tocopherol (Vitamin E) is a potent free radical scavenger and highly protective agent for collagen fibers against UV damage. This antioxidant has improved the UV- and heat resistance of the leather product. To help prevent over-drying, glycerol, a humectant, is added to tocopherol to not only maintain proper moisture content, but also to improve the UV and heat resistance of leather. The mixture of glycerol and tocopherol is applied as an emulsion with sodium dodecyl sulfate (SDS), as an emulsifying agent and coated the grain layer of that leather. Following exposure in a Fade-ometer, the treated samples were evaluated by colorimetric and mechanical testing for the efficacy of UV- and heat resistance. Data showed that leather coated with glycerol/tocopherol exhibited significant improvement in color fading resistance against UV radiation and heat. En ligne : https://drive.google.com/file/d/1Qg8OOonUTzHNM5WLOs4yntnYoXvO7Of-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5217 [article]

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Evaluation of degreasers as brine curing additives / Eduard Hernàndez Balada in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 5 (05/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 5 (05/2009) . - p. 169-176 Titre : Evaluation of degreasers as brine curing additives Type de document : texte imprimé Auteurs : Eduard Hernàndez Balada, Auteur ; William N. Marmer, Auteur ; Peter H. Cooke, Auteur ; John G. Phillips, Auteur Année de publication : 2009 Article en page(s) : p. 169-176 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The length of time needed for brine curing of raw hides and skins, a minimum of 18 h, is a time consuming process. In this paper we initially report the results of an investigation of the stratigraphic distribution of sodium chloride and water in fleshed hides cured for varying intervals of time. We demonstrated that salt entered the hide mainly from the flesh side. Water, on the other hand, was withdrawn from both sides of the hide; the epidermis acted as a semipermeable membrane. Three commercial degreasers as well as a glycolipid surfactant (sophorolipid) were tested as brine curing additives and their efficiency evaluated according to the moisture, salt, salt saturation and fat content levels in the brine cured hide. One of the commercial degreasers, when used at 0.5% w/w, significantly removed fat from the hide as well as enhanced the uptake of salt. The sophorolipid also was an effective degreasing agent, decreasing the fat content of the brine-cured hide and, if used in excess, significantly increasing the uptake of salt. The data presented here confirmed that the usage of an appropriate degreasing agent in the brine is a suitable option for reducing the turn-around times in raceways and thus creating additional curing capacity. En ligne : https://drive.google.com/file/d/1tmXZ4iHYvy-Z0bbk5GIKX19K_j6wLkuB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5218 [article]

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Possibility of using tannery waste for biodiesel production / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 5 (05/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 5 (05/2009) . - p. 177-182 Titre : Possibility of using tannery waste for biodiesel production Type de document : texte imprimé Auteurs : Karel Kolomaznik, Auteur ; Michaela Barinova, Auteur ; Tomas Fürst Année de publication : 2009 Article en page(s) : p. 177-182 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Waste fat produced by tanneries during the processes in which raw hide is transformed into leather represents a very important raw material for biodiesel production. Under laboratory and pilot-scale conditions, biodiesel samples were prepared from waste tannery fat and required analyses were carried out. The process of biodiesel production has three stages: 1) refining melting of the raw material (separation of fats from other undesirable components), 2) organic base-catalyzed methanolysis and 3) separation of glycerin layer. The mathematical model of zonal refining melting is presented in this paper as well as the results of the refining and methanolysis product analyses. The use of organic bases (tetramethylammonium hydroxide, n-butylamine, cyclohexylamine, etc.) is innovative. It enables us, in addition to considerable financial benefits, to produce a high quality biodiesel and glycerin containing practically no ash. Further, it contains a residual amine that works as a stabilizer, and after methanolysis the amine can be partially recycled. En ligne : https://drive.google.com/file/d/1cdXyo4XpskAQ-ayI1gyzcJBx6LOSVhKM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5219 [article]

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Coloring of leather using henna - natural alternative material for dyeing / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 5 (05/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 5 (05/2009) . - p. 183-190 Titre : Coloring of leather using henna - natural alternative material for dyeing Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Balaraman Madhan, Auteur ; W. Madhulatha, Auteur ; Jonnalagadda Raghava Rao, Auteur ; G. A. Gasmelseed, Auteur ; S. Sadulla, Auteur Année de publication : 2009 Article en page(s) : p. 183-190 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Synthetic dyes are widely used in the leather industry; some of these are carcinogenic in nature. Environmental concern leads one to seek dye products based on natural resources, which have several advantages like less toxicity, biodegradability, etc. The research work presented in this paper focuses on an eco-friendly dyeing process of the leather using aqueous henna leaves extract that contain lawsone, 2-hydroxy 1,4 naphthaquinone, the most prominent member of alpha – hydroxynaphthaquinone, natural dye class. The aqueous extraction from the henna leaves was studied and the best extraction conditions were found to be the maceration of the ground henna leaves in water, at temperature (> 80°C) for 60 minutes in a water bath without agitation. The color of the leather had become deeper with increasing amount of henna extract and multiple colors have been obtained depending on the type of mordants used. The henna dyeing had resulted in leathers with good rub (dry and wet) and perspiration fastness characteristics, while the light fastness characteristics were found to be moderate. En ligne : https://drive.google.com/file/d/1CW56u-TUPgTxFPrHbzc3eElLF5qzkeeO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5220 [article]

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