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Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins / Yuanhang Xiao in COLLAGEN AND LEATHER, Vol. 5 (2023)
[article]
Titre : Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins Type de document : texte imprimé Auteurs : Yuanhang Xiao, Auteur ; Jiajing Zhou, Auteur ; Chunhua Wang, Auteur ; Jinwei Zhang, Auteur ; Vera D. Radnaeva, Auteur ; Wei Lin, Auteur Année de publication : 2023 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants
Caractérisation
Coût
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Déchets -- Réduction
Eaux usées -- Analyse
Environnement -- Etudes d'impact
Produits chimiques -- Consommation -- Réduction
Synergie
Syntans
Tanins végétaux
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage métal free
Tannage synthétique
Tannage végétal
TriazineUne triazine est l'un des trois isomères du composé organique constitué d'un hétérocycle aromatique de six atomes, dont trois de carbone et trois d'azote. Chacune a donc pour formule C3H3N3.
La structure de la triazine est hétérocycle aromatique, analogue au cycle à six atome du benzène, mais avec trois atomes de carbone remplacés par des atomes d'azote. Les trois isomères correspondent donc aux emplacements respectifs des atomes de carbone et d'azote sur le cycle. On compte ainsi la 1,2,3-triazine, la 1,2,4-triazine, et la 1,3,5-triazine. Les autres hétérocycles aromatiques courant contenant de l'azote sont les azines (en particulier la pyridine) qui contiennent un atome d'azote, les diazines qui contiennent deux et les tétrazines qui en contiennent quatre.
Les triazines sont des bases faibles, plus faibles que la pyridine.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Restrictions on heavy metals, especially chromium, have encouraged alternative tanning systems that can reduce environmental and human health risks from conventional chrome-based tanning. In this work, metal-free combination tanning was developed by using vegetable tannins and a triazine-based syntan containing active chlorine groups (SACC). Specifically, the relationship between leather performance (e.g., hydrothermal stability and organoleptic properties) and technical protocols (e.g., types and dose of tannins) was systematically established. The optimized protocol involving a unique procedure (i.e., 10% SACC pre-tanning, shaving, and 25% wattle tanning) endowed the leather with high shrinkage temperature (~ 92 °C) and met the Chinese standards for shoe upper leather (QB/T 1873-2010). Our method not only produces zero chrome-containing solid wastes, but also uses ~ 75% less tannin for leather manufacture. The excellent leather performance was ascribed to the synergistic effects, where SACC and wattle diffused into collagen fibrils and may bind to collagen via covalent, hydrogen and ionic bonding, locking the hierarchical structure of collagen from microfibrils to fiber bundles. Moreover, we summarized these findings and proposed a diffusion-binding-locking mechanism, providing new insights for current tanning theory. Together with the biodegradable spent tanning liquor, this approach will underpin the development of sustainable leather manufacture. Note de contenu : - EXPERIMENTAL SECTION : Materials - Leather tanning process - Characterization - The environmental impact assessment (EIA) of metal-free tanning process
- RESULTS AND DISCUSSIONS : Optimizations of metal-free combination leather tannage - Molecular mechanisms in the combination tanning system - Morphologies and porous structures of leather - Organoleptic properties and physical performance of the leathers - Environmental assessment and cost analysis of our method
- Table 1 : The physical properties of the leathers. The value on the shoe upper leather suggests the Chinese standard requirements (QB/T 1873-2010)
- Table 2 : The content of extractable metals in the metal-free finished leather
- Table 3 : Environmental assessment index of tanning spent liquor
- Table 4 : The cost of main chemicals used in the SACC-tannin acid and SACC-wattle combination tanningDOI : https://doi.org/10.1186/s42825-022-00108-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00108-0.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38537
in COLLAGEN AND LEATHER > Vol. 5 (2023) . - 13 p.[article]Synthesis, characterisation and application of novel valonia tannin based waterborne polyurethane with natural colour / Yang Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 3 (05-06/2019)
[article]
Titre : Synthesis, characterisation and application of novel valonia tannin based waterborne polyurethane with natural colour Type de document : texte imprimé Auteurs : Yang Liu, Auteur ; Haihang Luo, Auteur ; Benyapathitiwong Ruj, Auteur ; Tao You, Auteur ; Youjie He, Auteur Année de publication : 2019 Article en page(s) : p. 135-141 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algues marines
Caractérisation
Cuirs et peaux -- Finition
Essais dynamiques
Humidité -- Absorption:Eau -- Absorption
Pliage (mécanique)
Polymères -- Analyse
Polymères -- Synthèse
Polymères en émulsion
Polyuréthanes
Résistance chimique
Solidité de la couleur
Taille des particules
Tanins végétauxIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel natural coloured waterborne polyurethane (PU) based on valonia tannin was successfully synthesised and characterised. A structural study of the polymer by Fourier Transform Infra Red (FTIR) spectroscopy confirmed the incorporation of valonia tannin into the backbone of the PU. The dispersion of valonia tannin and homogeneity of surface of the PU samples were confirmed by scanning electron microscopic (SEM) analysis. Chromaticity and colour difference further verified the colour depth and uniformity of the cured films. Thermogravimetric analysis (TGA) results indicated that the synthesised PU samples exhibited an improved thermal decomposition temperature. Particle size analysis, mechanical testing and water absorption of the synthesised PU samples further showed the effect of the cross-linked structure in the molecular chain segment. Moreover, the colour fastness and folding [flexing] resistance of the leather coating finished with synthesised PU was better than that of valonia tannin blending. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of polyurethane - Preparation of polyurethane films and finished leather samples - Measurements
- RESULTS AND DISCUSSION : FTIR spectral studies - Scanning electron microscope (SEM) analysis - Chromaticity and colour difference analysis - Particle size analysis - Thermal stability - Mechanical testing - Water and solvent resistance - Property analysis of leather coating
- Table 1 : Chromaticity size analysis
- Table 2 : The average particle size of the PU samples
- Table 3 : Water and solvent resistance of PU samples
- Table 4 : Properties of finished leather samplesEn ligne : https://drive.google.com/file/d/1vPbiP9usPOvkUanzxPqYIzf_EFe9o9MN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32670
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 3 (05-06/2019) . - p. 135-141[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20989 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of an amphoteric polymer auxiliary agent and its application to chrome-free leather / Luo Jianxun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 6 (11-12/2018)
[article]
Titre : Synthesis of an amphoteric polymer auxiliary agent and its application to chrome-free leather Type de document : texte imprimé Auteurs : Luo Jianxun, Auteur ; Feng Yanjuan, Auteur Année de publication : 2018 Article en page(s) : p. 298-303 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Colorants
Composés amphotériques
Copolymères
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 -- Teinture
Cuirs et peaux de chèvres
Formulation (Génie chimique)
Oxazolidine
Poids moléculaires
Polymères -- Analyse
Polymères -- Synthèse
Produits de nourriture du cuir
Tanins végétaux
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-SynthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to reduce the disadvantages of chrome tannage, chrome-free tannage was developped by many technologists and tanneries. However, because of the structures and charge of the tanning materials in the chrome-free tannage, the absorption rate of the chrome-free leather for anionic dyestuffs, re-tanning agents and fatliquors is lower than that of the chrome-tanned leather. Therefore, in order to improve the absorptivity of the chrome-free leather for these products, an amphoteric polymer auxiliary agent was synthesized with methyl-acrylic acid, sodium methylallyl sulfonate and dimethyl diallyl ammonium chloride (DMDAAC) by free radical copolymerization using ammonium persulfate at 80°C for 3 hours. The molar ratio of methyl-acrylic acid, sodium methylallyl sulfonate and dimethyl diallyl ammonium chloride was confirmed to be 1.0/0.3/ 1.0. The structure of the amphoteric polymer auxiliary agent was characterized by FTIR, H-NMR, C-NMR. The charge and properties of the solution of the amphoteric polymer auxiliary agent were characterised. Applied results of the amphoteric polymer auxiliary on the absorption of chrome-free leather for dyestuff and fatliquor, show that it has strong auxiliary absorptive capacity and the absorptive rate of dyestuff and fatliquor is more than 96%. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of the amphoteric polymer auxiliary agents - Application of series of the copolymers and the selection of the synthetic recipe - Molecular weight of the amphoteric polymer auxiliary agent and its structure determination - Test of isoelectric point (pI) of the amphoteric polymer auxiliary agent - Application and the optimum amount of the amphoteric polymer auxiliary agent on goatskin crust tanned by combination tannages
- RESULTS AND DISCUSSION : Analysis of the optimised formulation of the copolymer - Analysis of the molecular weight and the structure optimised formulation of the copolymer and its characteristics
- Table 1 : Parameters of orthogonal experiment
- Table 2 : Formulation of Lg(3 4 copolymer reaction with methyacrylic acid, dimethyl diallyl ammonium chloride, sodium methylallyl sulfonate
- Table 3 : The process of dyeing of the goatskin leather tanned by combination tannages with vegetable tannins and oxazolidine
- Table 4 : The process of fatliquor of the goatskin leather tanned by combination tannages with vegetable tannins and oxazolidine
- Table 5 : Results of Lg(3 4 copolymer reaction and application
- Table 6 : Relation between the band and the relevant group of APAA
- Table 7 : Relation between the band and the relevant group of APAA
- Table 8 : Relation between the band and the relevant group of APAA
- Fig. 1 : The synthesis of the amphoteric polymer auxiliary agent
- Fig. 2 : Curve of GPC of APAA
- Fig. 3 : IR spectrum of APAA
- Fig. 4 : 1H-NMR of APAA
- Fig. 5 : 13C-NMR of APAA
- Fig. 6 : relation between zeta potential and pH of APAA
- Fig. 7 : Relationship of the uptake of dyestuff and absorptive rate of fatliquor during the dyeing and fatliquoring of the goatskin crust tanned by combination tannage with vegetable tannins and aluminium tanning agent and the dosage of APAA
- Fig. 8 : Relationship of the uptake of dyestuff and absorptive rate of fatliquor during the dying and fatliquoring of the goatskin crust tanned by combination tannage with vegetable tannins oxazolidine and the dosage of APAAEn ligne : https://drive.google.com/file/d/1BiwvJszgvFJ3WgL2uSOk6h_DBCwO-A9M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31324
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 6 (11-12/2018) . - p. 298-303[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20391 - Périodique Bibliothèque principale Documentaires Disponible Tamarind shell tannin-doped hybrid sol-gel coatings on mild steel in acidic medium toward improved corrosion protection / Abdullahi Abdulmajid in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
[article]
Titre : Tamarind shell tannin-doped hybrid sol-gel coatings on mild steel in acidic medium toward improved corrosion protection Type de document : texte imprimé Auteurs : Abdullahi Abdulmajid, Auteur ; Tuan Sherwyn Hamidon, Auteur ; M. Hazwan Hussin, Auteur Année de publication : 2022 Article en page(s) : p. 527-542 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosifs
Anticorrosion
Caractérisation
Extraction (chimie)
Métaux -- Revêtements protecteurs
Sol-gel, Procédé
Tanins végétauxIndex. décimale : 667.9 Revêtements et enduits Résumé : This study investigated the application of tamarind shell tannin extracts (TSTE) [isolated using methanol (TME) and 70% acetone (TAE)]-doped hybrid sol-gel coatings prepared using (3-Glycidyloxypropyl)trimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) in 0.5 M HCl solution. The anticorrosion properties of these hybrid coatings on the surface of mild steel electrodes were described using potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS) measurements. The hybrid sol–gel coatings were characterized via FTIR. Also, the hydrophobicity of the coated plates was determined through water contact angle measurement. Meanwhile, the surface morphology and elemental compositions were determined using SEM/EDX analyses. The electrochemical measurements showed that the mixture of doped TME and TAE hybrid sol-gel coating resulted in higher corrosion resistance. The corrosion inhibition efficiency (CE) was CETME = 94.02 % and CETAE = 91.35 %, respectively. The Tafel slopes revealed a mixed form of corrosion protection with the main effect at cathodic sites. FTIR absorption bands attained at 945 cm-1 for TME and 961 cm-1 for TAE revealed Fe-O-Si bond formation. The higher corrosion inhibition capability of the coating matrix corroborates to higher water contact angle (θTME = 107.64°, θTAE = 104.62°) values. SEM analysis revealed coatings' improved corrosion protection due to the doping's enhanced inhibitive performance. Note de contenu : - Table 1 : Nyquist impedance parameters at various concentrations of TME- and TAE-doped hybrid sol-gel in 0.5 M HCl solution at 303 K
- Table 2 : Tafel parameters of undoped and TME- and TAE-doped hybrid sol–gel and their comparison with the bare mild steel in 0.5 M HCl solution at 303 K
- Table 3 : The FTIR bands of hybrid sol-gel matrix, coated hybrid sol–gel, and TAE- and TME-doped sol-gel coating
- Table 4 : The percentage of an element for the uncoated mild steel and hybrid sol-gel coated with TME and TAE extracts on mild steel acquired using EDX analysisDOI : https://doi.org/10.1007/s11998-021-00539-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00539-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37285
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 527-542[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23408 - Périodique Bibliothèque principale Documentaires Disponible Tannin analysis by near infrared spectroscopy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 1 (01-02/1995)
[article]
Titre : Tannin analysis by near infrared spectroscopy Type de document : texte imprimé Année de publication : 1995 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants
Ecorces
Spectroscopie infrarouge proche
Statistique
Tanins -- analyse
Tanins végétauxIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé :
The use of near infrared spectroscopy (NIRS) is demonstrated to be an important alternative to the empirical and laborious traditional methods for tannin analysis of the bark of black wattle (Acacia mearnsii De Wild.), particularly when large numbers of samples have to be processed rapidly.
A set of 98 ground wattle bark samples was used to calibrate the output from a NIRS instrument, taking absorption readings every 2 nm between 1100 nm and 2498 nm. The spectral data from this calibration set was then statistically manipulated using multivariate techniques to generate calibration models. These calibrations were then applied to a separate set of 79 bark samples which, for validation purposes, were also analysed by wet chemistry. The tannin analysis predictions compared favourably with the wet chemistry results on these samples, with standard errors of determination of 1.2%, 0.3% and 1.1% for tans, non-tans and total extractives respectively.Note de contenu : - MATERIALS AND METHODS : Sample preparation - Analysis - Statistical analysis
- RESULTS AND DISCUSSION : Spectral characteristics of bark components
- Table 1 : Characteristics from classical wet chemistry
- Table 2 : Calibration and validation statistics obtained for tans, non-tans and total extractives using partial least squares regression on first derivative transformation of spectral data (PCs = principle components ; SED square error of determination)
- Table 3 : Spectral characteristics of bark componentsEn ligne : https://drive.google.com/file/d/1lj2fjUM8ieQnDb6Bvh-3mCGDFdPG1TZl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40049
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 79, N° 1 (01-02/1995)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007002 - Périodique Bibliothèque principale Documentaires Disponible Tannin analysis of selected plants from Laikipia County, Kenya / Alex Kuria in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 2 (03-04/2016)
PermalinkTannin characterization and sourcing in historical leathers through FTIR spectroscopy and PCA analysis / Alireza Koochakzaei in COLLAGEN AND LEATHER, Vol. 5 (2023)
PermalinkTanning capacity of Tessmannia burttii extracts : the potential eco-friendly tanning agents for the leather industry / Cecilia R. China in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
PermalinkTara (Caesalpinia spinosa) : The sustainable source of tannins for innovative tanning processes / Juan-Carlos Castell in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 6 (06/2013)
PermalinkTerminalia chebula, la plante sacrée de la médecine bouddhique / François Marchio in EXPRESSION COSMETIQUE, N° Hors série (12/2014)
PermalinkThe chemistry of vegetable tannins / London [Royaume Uni] : Society of Leather Trades'Chemists (1956)
PermalinkThe effect of mordant salts on antibacterial activity of wool fabric dyed with pomegranate and walnut shell extracts in COLORATION TECHNOLOGY, Vol. 128, N° 6 (2012)
PermalinkThe function of the basic groups of collagen in its reaction with vegetable tannins / Karl Helmer Gustavson in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 50, N° 4 (04/1966)
PermalinkThe measurement of the binding of tannin subunits to soluble collagen by continuous-flow dynamic dialysis / Neil A. Sparrow in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
PermalinkThe natural organic tannins / Maximilian Nierenstein / Londres [Royaume-Uni] : J. & A. Churchill ltd. (1934)
PermalinkUltrasound assisted vegetable tannin extraction from myrobalan nuts for leather application / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 2 (02/2018)
PermalinkUltrasound extraction of valonea tannin and its effects on extraction yield / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 11 (11/2012)
PermalinkVegetable tannins / E. H. W. Rottsieper / Saint-Albans : W. Cartmel & Sons (1946)
PermalinkWet-white leather processing : a new complex combination tannage / Luo Jianxun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 3 (05-06/2011)
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