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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 The influence of solvents on hydrothermal stability and microstructure of combination tannage / Wang Yajuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
[article]
Titre : The influence of solvents on hydrothermal stability and microstructure of combination tannage Type de document : texte imprimé Auteurs : Wang Yajuan, Auteur ; Shan Zhihua, Auteur ; Jiang Lan, Auteur ; Wu Ningkun, Auteur ; Shao Shuangxi, Auteur Année de publication : 2012 Article en page(s) : p. 48-55 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alun
Cuirs et peaux
Glutaraldéhyde
Microscopie électronique à balayage
Microstructures
Mimosa et constituants
Oxazolidine
Stabilité hydrothermale
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The influence of solvents on combination tanned leather was established with observation of thermal stability, and the microstructure of the leather sample before and after shrinkage. Thermal stability of leather tanned with MI (mimosa), GA (glutaraldehyde, OZ (oxazolidine) and Al (aluminium sulphate) were reported using the shrinkage temperature for helix and random coil transition after soaking in O.5, 1.0 and 2.0 mo/L urea solution had a very obvious effect on GA-MI and MI-OZ-tanned leather, whose Ts reduced to 84,2°C and 84,6°C from 94,8°C and 100,9°C respectively. The influence of acidity and basicity of the solution also cannot be ignored, and OZ-MI leather was the most susceptible one whose Ts reduced to 85,3°C from 97,7°C the thermal stability of leather involving MI and Al can be affected remarkably by glycerin. All of the leather samples showed a more obvious Ts decrease when it was soaked from the dry state than in moist state.
Scanning electron microscope (SEM) studies revealed that the microstructure of collagen is destroyed when it shrinks and that the degree of destruction depends on the cross-linking agents.Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Preparation of leather samples - Solvent treatment - Micro-morphology of sample
- RESULTS AND DISCUSSION : Hydrothermal stability of MI and GA leather - Micro-morphology of MI and GA leather - Hydrothermal stability of MI and OZ leather - Micro-morphology of MI and OZ leather - Hydrothermal stability of MI and Al leather - Micro-morphology of MI and Al leatherEn ligne : https://drive.google.com/file/d/1h6CrbyREtmKMIjmL08MwCsp86RaHhf_0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14567
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 2 (03-04/2012) . - p. 48-55[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13844 - Périodique Bibliothèque principale Documentaires Disponible The reaction of vegetable tannin-aldehyde-collagen - A further understanding of vegetable tannin-aldehyde combination tannage / Zhongbing Lu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 5 (09-10/2003)
[article]
Titre : The reaction of vegetable tannin-aldehyde-collagen - A further understanding of vegetable tannin-aldehyde combination tannage Type de document : texte imprimé Auteurs : Zhongbing Lu, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2003 Article en page(s) : p. 173-178 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calorimétrie
Cuirs et peaux de moutons
Mimosa et constituants
Oxazolidine
Poudre de peaux
Stabilité hydrothermale
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 organique
Tannage végétal
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Using mimosa as a vegetable tanning agent and oxazolidine as an aldehydic tanning agent, the approaches of hydrothermal analysis, hydrogen bond and hydrophobic bond breaking as well as chemical modifications of collagen were employed to investigate the effects of hydrogen bonds, hydrophobic bonds and side amino groups of collagen on vegetable tanning, aldehyde tanning and vegetable-aldehyde combination tanning The results indicated that the aldehyde should still predominantly react with the side amino group of collagen even when added after vegetable tanning. However, the aldehyde could further react with the vegetable tannin and thus form a cross-linkage between collagen and the vegetable tannin if high-activity nucleophilic sites are present in the tannin molecules. As a result, the synergistic effect of the combination tanning on increasing the hydrothermal stability of collagen fibres was achieved and the combined stability of vegetable tannin and collagen was strengthened remarkably. This mechanism is appropriate for describing combination tanning with condensed tannins which contain nucleophilic sites. However, with hydrolysable tannins, no aldehydic cross-linkage between collagen and tannin could be observed.
In general, this research revealed that vegetable-aldehyde combination tanning has features which are different from those previously assumed. According to the mechanism suggested in this paper, all the phenomena relating to vegetable tannin -aldehyde-collagen interactions can be well understood.Note de contenu : - EXPERIMENTAL METHODS :
- Materials
- Methods
- Vegetable tanning of hide powder
- Combination tanning of hide powder
- Aldehyde tanning of hide powder
- Hydrogen bond breaking
- Hydrophobic bond breaking
- Differential scanning calorimetry (DSC) studies
- Amino analysis
- RESULTS AND DISCUSSION
- Table 1 : The influence of urea solution on hydrothermal stability of collagen (oC)
- Table 2 : The influence of n-propanol solution on hydrothermal stability of collagen (oC)
- Table 3 : The content of typical amino acids in the hide powders before and after chemical modifications (number of amino acid / 1000 amino acids)
- Table 4 : Ts and Tp of hide powders tanned by different tannages (oC)
- Table 5 : The shrinkage temperature (Ts) of the sheepskin leathers tanned by combination tannage using 20% tannin extract and 4% oxazolidine
- Table 6 : The influence of sequence in combination tannage on shrinkage temperatureEn ligne : https://drive.google.com/file/d/1hO3CzXXRcP8Uf_g31Ja9PijSfHmCzAJ-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39707
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 5 (09-10/2003) . - p. 173-178[article]Ultra-low viscosity oxazolidine and aldimine-based reactive diluents for high-solids polyurethane coatings / Thomas L. Johnson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 849 (10/1995)
[article]
Titre : Ultra-low viscosity oxazolidine and aldimine-based reactive diluents for high-solids polyurethane coatings Type de document : texte imprimé Auteurs : Thomas L. Johnson, Auteur Année de publication : 1995 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs
Diluants
Haut extrait sec
Oxazolidine
Polyuréthanes
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The oxazolidine product (Zoldine RD-20) and the oxazolidine-aldimine product (Zoldine RD-4) have been shown to perform as highly effective reactive diluents. These products both possess extremely low intrinsic viscosities at 100% solids and function as very good diluents in millbases or when blended with higher viscosity polyols. They also provide great flexibility in pot life and controlled reactivity as co-reactants for polyisocyanates in high-solids coatings.
Oxazolidine and oxazolidine-aldimine reactive diluents were shown to significantly increase solids at equivalent system viscosity in polyurethane coatings. As a result these materials represent a viable technology to significantly reduce VOC in higher solids systems. Performance improvements can also be expected in the areas of impact resistance and abrasion resistance when these compounds are employed as an integral part of high-solids polyurethane coatings. More importantly, these compounds will substantially improve the weathering performance of polyester polyurethanes even in the absence of UV inhibitors.Note de contenu : - Reactive diluents
- Characteristics of oxazolidines
- Oxazolidines as reactive diluents
- Cure response and pot life
- Film performance
- Weathering performancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18562
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 849 (10/1995) . - p. 41-47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003495 - Périodique Bibliothèque principale Documentaires Disponible 003507 - Périodique Bibliothèque principale Documentaires Exclu du prêt Wet-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)
[article]
Titre : Wet-white leather processing : a new complex combination tannage Type de document : texte imprimé Auteurs : Luo Jianxun, Auteur ; Shan Zhihua, Auteur ; Bi Shi, Auteur Année de publication : 2011 Article en page(s) : p. 93-97 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Cuirs et peaux de chèvres
Oxazolidine
Tanins végétaux
Wet-white (tannage)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new complex combination tannage on combination tannage of veg-Al and veg-Oxa has been developed as a chrome-free tannage. The veg-Al-Oxa tannage was applied to hide powder and pickled goatskin. The shrinkage temperature of the finished leather obtained by veg-Al-Oxa complex combination tanning is 112°C, which is much higher than that of binary combination tannages. The fibre weave is better separated in ternary combination tannage than in a single tannage or binary combination tannage as judged from SEM images. Based on Ts, length contraction rate, tensile strength and tear strength of the leather on heat-ageing, a good ternary combination tannage sequence is confirmed to be vegetable tannins, aluminium tanning agent and oxazolidine. The optimized offers of vegetable tannins, aluminum tanning agent and oxazolidine are 10 %, 3 % based on pickled goatskin pelt. Note de contenu : EXPERIMENTAL PROCEDURES :
- Materials
- Methods : Tanning of hide powder
- GOATSKINS COMBINATION TANNING USING VEGETABLE TANNINS, ALUMINIUM TANNING AGENT AND OXAZOLIDINE : Testing of the chrome-free leather - Scanning electron microscopic examination of leather samples
RESULTS AND DISCUSSION : Results of hide powder tanning - Characteristics of the leathersEn ligne : https://drive.google.com/file/d/1u7mgS9V8fk6omA9i3uiZnLvXinvIC7XZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11876
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 3 (05-06/2011) . - p. 93-97[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013132 - Périodique Bibliothèque principale Documentaires Disponible Zirconium acetate - Oxazolidine combination tannages in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 4 (07-08/2010)
PermalinkZirconium-oxazolidine combination tannage for sheep garment leather / Qiang Tao-Tao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)
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