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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
007089	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > 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 : Basification (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 Cuirs et peaux -- Finition Naphtalène Poudres 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 conventional tannage and this made difficult the interpretation of the results obtained. For the final assessment, therefore, matched sides were used for comparison 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 leather from experiment 4 - Table 5 : Subjective assessment of finished leather from experiment 4 En ligne : https://drive.google.com/file/d/1hY8aY_QacT_ouLkKfJmdB63SvVhRHWTO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40710 [article]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Stimuli responsive leathers using smart retanning agents / Sangeetha Subramanian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 6 (06/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 6 (06/2012) . - p. 196-204 Titre : Stimuli responsive leathers using smart retanning agents Type de document : texte imprimé Auteurs : Sangeetha Subramanian, Auteur ; N. N. Fathima, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2012 Article en page(s) : p. 196-204 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Cuir Formaldéhyde Fourier, Spectroscopie infrarouge à transformée de Matériaux intelligents Matériaux thermosensibles Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Microscopie électronique à balayage Naphtalène Retannage Syntans Thermogravimétrie Transition de phase En physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...). Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The main use of leather is to protect the body against external environment and to provide comfort. However, leather may be used for additional functions specific to 1) an adverse or extreme climate and 2) job-ambience or profession so as to enhance adaptability and productivity of the user. When such an application arises, the leather is termed as “smart material”. Making leather perform the functions it did as a skin on a live animal renders it as smart leather. Hence, the futuristic objective is to make the processed skin termed “leather” retain its memory so as to result in “smart or intelligent leather”. In this paper, it has been attempted to incorporate thermo responsive function into leathers using smart materials such as phase changing materials (PCM). PCMs are capable of absorbing or releasing large amount of heat during phase transitions between two solid states and/or liquid and solid states. Manufacture of syntans using PCM based on two different prepolymers viz, melamine formaldehyde and naphthalene sulfonic acid has been attempted in this paper. The retanning agents synthesized have been characterized using various techniques like FT-IR, DSC, TGA and SEM analysis. Leathers made using PCM incorporated retanning agents have been tested for various properties viz. strength properties, thermal stability, organoleptic properties to study the influence of the PCM incorporated retanning agents. Note de contenu : - REAGENTS MICROENCAPSULATION OF n-OCTADECANE : Synthesis of prepolymer solution - Synthesis of oil phase - Synthesis of water phase - Emulsion preparation - Fabrication of microcapsules (PCM)) - CHARACTERIZATION OF SMART RETANNING AGENTS : FT-IR analysis - Differential scanning calorimetry - Thermo-gravimetric analysis - Scanning electron microscopy - RETANNING AND CHARACTERIZATION OF LEATHERS MADE USING SMART RETANNING AGENTS - CHARACTERIZATION OF RETANNING AGENTS MADE USING PCM FTIR ANALYSIS : Scanning Electron Microscopy analysis - Thermo Responsive Function Analysis - PROPERTIES OF LEATHER MADE USING PCM : Thermal Stability (DSC and TGA) of leathers - Scanning Electron Microscopic Studies of Leathers - Physical strength characteristics of leathers - Hand evaluation of leathers - Thermo responsive function En ligne : https://drive.google.com/file/d/1q8RiPFy-qGqifrMclOhTAMfwDOMHfayT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15533 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
13991	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)