Application of carboxyl-functionalized epoxy resin in the leather tanning process / Bin Lyu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 7 (07/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 7 (07/2018) . - p. 225-231 Titre : Application of carboxyl-functionalized epoxy resin in the leather tanning process Type de document : texte imprimé Auteurs : Bin Lyu, Auteur ; Li Yajuan, Auteur ; Dangge Gao, Auteur ; Jianzhong Ma, Auteur ; Lv Leihong, Auteur Année de publication : 2018 Article en page(s) : p. 225-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Détérioration enzymatique Douceur (toucher) Eaux usées -- Teneur en chrome hexavalent Epoxydes Groupement carboxyle Polymères -- Synthèse Réactions chimiques Stabilité hydrothermale Tannage Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning is widely used in the tanning process ; however, it can cause environmental pollution. Leather tanned with epoxy resin was considered as a more environmentally friendlyprocess, but it takes as long as five days for reaction, and results in poor performance of leather. The aim of the present study was to tan leather collagen with a carboxyl-functionalized epoxy resin, which was thought to be an eco-friendly tanning process and the reaction time was shortened to 12h. The reaction between carboxyl-functionalized epoxy resin and leather collagen can be divided into two stages, the reaction of epoxy group with leather collagen and the reaction of carboxyl group with leather collagen. The influences of tanning conditions (medium pH, epoxy resin amount and reaction time) on the properties of tanned leather were also discussed. In the first stage, the epoxy group was reacted with leather collagen in basic conditions. The results showed that the carboxyl-functionalized epoxy resin could better penetrate into the leather fibers when the pH value was 8.5, and the best effect of tanned leather collagen was found using reaction condition of pH 7.0. In the second stage, it was the reaction of carboxyl group to leather collagen in acid conditions, and the best effect was found under the condition of pH was 3.5. Meanwhile, it provided a better tanning effect when the carboxyl-functionalized epoxy resin amount was 6% and the reaction time was 12h. The chrome-less tanning process that carboxyl-functionalized epoxy resin combination with 3% chrome was studied. The results showed that the hydrothermal stability and strength properties of leather tanned by carboxyl-functionalized epoxy resin with 3% chrome were close, even superior, to those of the leather produced by conventional chrome tanning with 8% chrome. Note de contenu : - MATERIALS AND METHODS : - Material - Methods : Synthesis of the carboxyl-functionalized epoxy resin - Tanning methodology - Testing and characterization : Shrinkage temperature - Thickness increment ratio - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water - Calculation - RESULTS : - Tanning conditions of carboxyl-functionalized epoxy resin pH : The amount of tanning agent - Chrome-less tanning results : SEM topography of the leather - Physical properties - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water En ligne : https://drive.google.com/file/d/1zAn7Cgd6nhD2xonUrhpGkK5uE09EybTG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30830 [article]

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Chrome-less tanning - a non-pickling process based on Zr-Al-Ti complex tanning agent / Wang Kangjian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 1 (01-02/2018)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 1 (01-02/2018) . - p. 1-6 Titre : Chrome-less tanning - a non-pickling process based on Zr-Al-Ti complex tanning agent Type de document : texte imprimé Auteurs : Wang Kangjian, Auteur ; Chen Yining, Auteur ; Dan Nianhua, Auteur ; Dan Weihua, Auteur Année de publication : 2018 Article en page(s) : p. 1-6 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés mécaniques Eaux usées -- Teneur en chrome hexavalent Essais (technologie) Etudes comparatives pH -- Mesure Tannage au chrome Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The non-pickting tanning for cattle hide upper leather was carried out with chrome-less process based on zirconium-aluminium-titanium tanning (DMT-II) in this paper. The best material offers of DMT-Il and chrome tanning agent were selected through preliminary experiments. The operating parameters in the tanning process, including the pretreatment, the temperature after basification and the final pH, were optimize using the orthogonal testing method. The chrome content of wastewater was chosen as an evaluation index. The evaluation indexes of the optimum scheme were compared with those of the conventional chrome tanning method. The shrinkage temperature of the crust leather (Ts), the chrome content of wastewater BOD5/COD and the gross mechanical property and the histological sections Were evaluated. The results.showed that the shrinkage temperature of the crust leather could be up to 90°C when the tanning temperature was 35°C and the pH after tanning was 4.5, the chrome content of the wastewater was less than 50mgL-1. The BOD5/COD was much higher than those of the.converitional chrome tanning method. Moreover, the shrinkage temperature, mechanical properties, crust leather fibres tighter density were comparable to those of conventional chrome tanning. Note de contenu : - EXPERIMENTAL : Materials - Experimental procedures - RESULTS AND DISCUSSION : Non-pickling chrome-less tanning preliminary experiment - Orthogonal test of non-pickling chrome-less tanning - TABLE : 1. The factors and levels of orthogonal tests - 2. Non-pickling chrome-less tanning process - 3. Results of non-pickling chrome-less tanning preliminary experiment - 4. Results of orthogonal test of non-pickling chrome-less tanning - 5. Analysis of orthogonal test of non-pickling chrome-less tanning - 6. Results of optimum non-pickling chrome-less tanning and common chrome tanning process - FIGURES : 1. Histological observation of the cross sections of crust leathers - 2. Histological observation of the longitudinal sections of crust leathers En ligne : https://drive.google.com/file/d/10o_ZJ2LjsMaC060vjadNeJLmy-AxP2Uk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30007 [article]

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Cr(VI) Formation in double-face sheepskins : Effect of chromium level and ironing / Bahri Basaran in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 1 (01-02/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 1 (01-02/2007) . - p. 4-10 Titre : Cr(VI) Formation in double-face sheepskins : Effect of chromium level and ironing Type de document : texte imprimé Auteurs : Bahri Basaran, Auteur ; Nuray Olcay Isik, Auteur Année de publication : 2007 Article en page(s) : p. 4-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent Cuir -- Teneur en chrome hexavalent Cuir double face Cuirs et peaux de moutons Décoloration Dibrome Le dibrome (Br2) est une molécule composée de deux atomes de brome. C'est l'unique forme moléculaire (allotrope) de l'élément brome.Le dibrome est un liquide rouge très volatil. Il est très toxique par inhalation et provoque de graves brûlures. Les vapeurs attaquent les muqueuses, la peau et le système respiratoire. Sa solution aqueuse s'appelle "l'eau de brome", qui est beaucoup moins nocive. - Propriété oxydante : Le dibrome a un pouvoir oxydant élevé : E°(Br2/Br-) = 1,07 V. Ainsi, l'eau de brome permet de mettre en évidence la présence d'une double liaison (voir Test au dibrome) en l'oxydant. - Précautions : Du fait de son fort pouvoir oxydant, et parce qu'il est extrêmement volatil, le dibrome dégage des vapeurs toxiques, suffocantes et rougeâtres. Au contact de la peau, il engendre des plaies qui cicatrisent très lentement. Le dibrome est détruit par une solution de thiosulfate de sodium. (Wikipedia) Eaux usées -- Teneur en chrome hexavalent Laine -- Teneur en chrome hexavalent Laine de mouton Satinage Solutions (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study examines the relationship of Cr(VI) formation in leather and wool fibres to the level of Cr and the ironing temperature in double-face processing. The chromium oxide levels in both the leather and wool fibres of the skins were measured. An increase in the amount of basic chromium sulphate used was shown to increase the chromium content in both leather and wool fibres. Related to this increase, parallel increases in the amount of Cr(VI) in leather and wool fibres were detected by the analysis method - DIN 53314 (IUC 18: 1997). Furthermore, higher temperatures during the ironing processes produced higher levels of Cr(VI) in leather and wool fibres. To eliminate any false-positive results due to the interference of dyestuffs in the Cr(VI) determination with dark coloured extracts, Br2/water solutions were added to extract solutions and the measurements were repeated in the transparent extracts. A comparison of the results revealed that in the extracts with Br2/water addition, Cr(VI) values were lower and it was concluded that Br2/water solution eliminated the dyestuff interference and, therefore the false-positive results. Note de contenu : - EXPERIMENTAL PROCEDURE : Double-face processing - Cr2O3 Analysis and Cr(VI) determinations - Decolorising the extract by Br2/water addition - Reaction mechanism of Br2/water - RESULTS AND DISCUSSION : Decolorising with Br2/water addition - Calibration curve of standardized solutions - Recovery rates of sample groups - Absorbance values of Br2/water - Cr2O3 contents of the leather, wool fibres and exhausted floats - Cr(VI) contents determined in leather and wool sides of double-faces - Cr(VI) concentrations in leather and wool of double-face determined both with and without Br2 solution - Table 1 : Experimental design of the study - Table 2 : Process used for processing double-faces - Table 3 : Absorbance values of Br2/water against water - Table 4 : Chromium oxide contents of leathers, wool fibres and exhausted floats En ligne : https://drive.google.com/file/d/1thGG6QSg4zSkZyWj1M3wEV9rFED_1FdB/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39039 [article]

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Determination of chromium(III) and chromium(VI) in water by low Pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry / Jin Haochen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 182-185 Titre : Determination of chromium(III) and chromium(VI) in water by low Pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry Type de document : texte imprimé Auteurs : Jin Haochen, Auteur ; Zhang Xinshen, Auteur ; Wan Xu, Auteur ; Wang Junwei, Auteur Année de publication : 2016 Article en page(s) : p. 182-185 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie Eaux usées -- Analyse Eaux usées -- Teneur en chrome hexavalent Eaux usées -- Teneur en chrome trivalent Spectrométrie de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel method using low pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry (LPLC-ICP-MS) has been developed for the determination of water-soluble chromium(III) and chromium(VI) in waste water. The low pressure anion exchange column used in this system contained quaternary ammonium groups, which could separate the Cr(III) from Cr(VI). The ICP-MS was used as the detector in this coupled system to detect the concentration of chromium. The linear range of this method was 10.0ng.L-1~1.0mg•L-1 ; the detection limit of Cr(III) was 3.5ng.L-1, Cr(VI) was 9.8ng•L-1(pH=7) ; the precision of Cr(III) was 2.1%, Cr(VI) was 4.6% (n=6). Compared with National Standard Method of China reste the error was ±6%. Note de contenu : - EXPERIMENTAL PROCEDURE : Reagents - Apparatus - Analytical procedure - RESULTS AND DISCUSSION : Composition and concentration of mobile phase - Flow velocity of mobile phase - Potential of hydrogen (pH) of mobile phase - Comparison of different mass to charge ration (m/z) - Reproductibility calibration curve and detection limit En ligne : https://drive.google.com/file/d/1nzvOrJ0TW5q3z2OdZFkOINBY0U6bsi2y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26795 [article]

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Determination of chromium(VI) with bordeaux red by flow injection spectrophotometry in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 3 (05-06/2008) . - p. 1 Titre : Determination of chromium(VI) with bordeaux red by flow injection spectrophotometry Type de document : texte imprimé Année de publication : 2008 Article en page(s) : p. 1 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Chimie analytique Chrome hexavalent Eaux usées -- Teneur en chrome hexavalent Oxydation Rouge (couleur) Spectrophotométrie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new flow injection spectrophotometric method for determination of chromium(VI) in tannery wastewater is introduced. The proposed method is based on the oxidation of bordeaux red by chromium(VI) in acidic media. The absorbance was registered at 520nm. Under the optimum conditions, the linear range for chromium(VI) was 0.10-10.0mg/L. The detection limit was 0.02mg/L. The relative standard deviation (n = 11) for 2.0 mg/L chromium(VI) was 1.37 %. This method is simple, accurate, sensitive and rapid. The method was applied to the determination of chromium(VI) in tannery wastewater with satisfactory results. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemical reagents - ANALYTICAL PROCEDURE - RESULTS AND DISCUSSION : Choice of wavelength - Effect of flow injection variables - Effect of chemical reaction variables - Calibration curve, reproducibility and detection limit - Effects of foreign ions - Analysis of the samples - Table 1 : Determination of chromium(VI) in tannery wastewater En ligne : https://drive.google.com/file/d/1nk1YajZwVWv32Z7fLvpM-ZaRoICa4rQ-/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38957 [article]

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Development of a reagent kit for rapid determination of chromium (VI) / Ding Shaolan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

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Electrochemical separation of chromium containing tannery waste liquid / Zheng Haonan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 3 (05-06/2020)  

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Release of chrome in chrome tanning and post tanning process / Zhou Jian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 4 (07-08/2012)  

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