Hyperbranched polymers - A primer for their uses in the leather industry / Wang Xue-Chuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 2 (03-04/2006)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 2 (03-04/2006) . - p. 54-57 Titre : Hyperbranched polymers - A primer for their uses in the leather industry Type de document : texte imprimé Auteurs : Wang Xue-Chuan, Auteur ; Qiang Tao-Tao, Auteur ; Ren Long-Fang, Auteur Année de publication : 2006 Article en page(s) : p. 54-57 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Cuirs et peaux -- Finition Floculant Polymères ramifiés Système de libération contrôlée (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The evolution, structural traits and characteristics of hyperbranched polymers are summarized. Furthermore, the article analyzes the feasibility of their applicability as a new type of tanning agent in leather industry with the possibility of chrome-free leather. The article is intended as a guide and introduction to hyperbranched polymers and their possible applications in the leather industry. Note de contenu : - BACKGROUND : Special features of hyperbranched polymers - APPLICATION FOREGROUND OF HYPEBRANCHED POLYMERS IN THE LEATHER INDUSTRY : Use as tanning and retanning agents - Used to prevent Cr (VI) formation in leather - Use as highly absorptive chrome tanning auxiliaries - Use as finishing agents and auxiliaries - Use as sustained-release agents - Use as levelling and fixing agents - Used as flocculating agents in tanning waste disposal En ligne : https://drive.google.com/file/d/1BpyCZdK6s05GMwWA7gPGuzSPe4ZyP-92/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39157 [article]

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Phosphonium-aluminum combination tanning for goat garment leather / Ren Long-Fang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 6 (06/2009) . - p. 232-241 Titre : Phosphonium-aluminum combination tanning for goat garment leather Type de document : texte imprimé Auteurs : Ren Long-Fang, Auteur ; Wang Xue-Chuan, Auteur ; Qiang Tao-Tao, Auteur ; Ren Yong-Qiang, Auteur ; Xu Jianxin, Auteur Année de publication : 2009 Article en page(s) : p. 232-241 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new tetrakis hydroxymethyl phosphonium sulphate (THPS)-aluminum combination tanning system has been developed. The optimum dosage of THPS was 2.0%. The amount of THPS and basic aluminum chloride was optimized at 2.0% and 3.0% (basing on the weight of pelt). The influence of ligands on the shrinkage temperature (Ts) of leathers was also studied and the Ts of THPS-aluminum combination tanned leathers was above 88°C. Color fastness to dry/wet rub of THPS-aluminum combination tanned leathers was much better than the relevant color fastness to dry/wet rub of leathers tanned with THPS alone. Scanning electron microscopic studies showed that the fiber weave of THPS-aluminum combination tanned leather was much closer than leathers tanned with THPS alone and the fiber weave of THPS-aluminum combination tanned leather was closer(tighter) with an increase of amount of basic aluminum chloride. Hence, with the increase of the amount of basic aluminum chloride, the reactive ability of basic aluminum chloride with collagen fiber was stronger and the softness became worse. Degradation rate of soiling for the THPS-aluminum combination tanning leather was much quicker than that of chrome tanning leather. Through SEM analysis, the surface structure of leather which was not degraded was more regular than the leather degraded for 30 days. Meantime, the of THPS-aluminum combination tanning leather degradated much more easily than the chrome leather, which suggested a benefit for the sustainable development of the leather industry in future. En ligne : https://drive.google.com/file/d/1rceSxbfqOplHnQS3Mb4wFMBANyf5JUUs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5988 [article]

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Phosphonium-zirconium combination tannage for goat garment leather / Qiang Tao-Tao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 5 (09-10/2008) . - p. 192-199 Titre : Phosphonium-zirconium combination tannage for goat garment leather Type de document : texte imprimé Auteurs : Qiang Tao-Tao, Auteur ; Wang Xue-Chuan, Auteur ; Ren Long-Fang, Auteur ; Xu Jian-Xin, Auteur Année de publication : 2008 Article en page(s) : p. 192-199 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés chimiques Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de chèvres Essais (technologie) pH Sulfate de tétrakis hydroxyméthyl phosphonium Le sulfate de tétrakis hydroxyméthyl phosphonium est un myxobactéricide qui offre une prévention efficace contre les biofilms microbiens dans les eaux de traitement, et ce, pour une vaste gamme de micro-organismes formant des biofilms. Le sulfate de tétrakis (hydroxyméthyl) phosphonium agit principalement en augmentant la perméabilité de la membrane externe de l'enveloppe de la cellule microbienne, ce qui entraîne la libération rapide de protéines et d'autres substances cellulaires par les cellules. En outre, le sulfate de tétrakis (hydroxyméthyl) phosphonium inhibe le processus de sulfatoréduction dans les bactéries réductrices de sulfate. Tannage combiné Le 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-Synthétique Zirconium Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new tetrakis hydroxymethyl phosphonium sulphate (THPS)-zirconium combination tanning system has been developed. The optimum dosage of THPS, pickling pH and basifying pH were 2.0%, 3.5 and 5.0, respectively. The amount of THPS and zirconium sulphate were optimized at 2.0% and 2.5% (based on the pelt weight). The influence of ligands on the shrinkage temperature (Ts) of leathers has also been studied and the Ts of THPS alone and THPS-zirconium combination tanned leathers was much better than the relevant colour fastness to dry/wet rub of THPS alone tanned leathers. Scanning electron microscopic studies show that the fibre weave of THPS-zirconium combination tanned leather was much closer than for THPS only tanned leather and the fibre weave of THPS-zirconium combination tanned leather was closer with an increase of amount of zirconium sulphate. Hence, this proves that the softness was reduced with an increase of the amount of zirconium sulphate and that the reactivity of zirconium sulphate with collagen fibre was very strong. The bulk trial carried out in Haining Shangyuan Leather Co., Ltd., proved that all indexes of the leather reached Chinese standard requirements. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Determination of Ts - Optimization of the dosage of THPS - Optimizing pH - THPS-zirconium combination tanning - Physical testing and handle of leather - Test of Cr2O3, Cr6+ and formaldehyde content - Analysis with scanning electron microscopic (SEM) - RESULTS AND DISCUSSION : Optimization of the dosage of THPS - Optimization of pH - Optimization of the dosage of zirconium retanning agent - Fig. 1 : Relation of Ts and the dosage of THPS - Fig. 2 : Relation of tensile strength and the dosage of THPS - Fig. 3 : Relation of tear strength and the dosage of THPS - Fig. 4 : Organoleptic properties of THPS alone tanned leathers - Fig. 5 : Relation of TS and the dosage of zirconium sulphate - Fig. 6 : Organoleptic properties of leathers tanned with THPS-zirconium - Table 1 : Process to pickle and tan for wet salted goatskins - Table 2 : Process topickle and tan and post tanning for garment leather - Table 3 : Zirconium retanning process for garment leather - Table 4 : Relation of pickling pH and penetration of THPS - Table 5 : Relation of basifying pH and Ts - Table 6 : Dyeing ability of THPS-zirconium combination tanned leather - Table 7 : Physical-chemical properties of leathers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35250 [article]

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Synthesis and properties of hydroxyl-terminated hyperbranched poly isocyanurate-ester retanning agents / Ren Long-Fang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 7 (07/2017) . - p. 240-249 Titre : Synthesis and properties of hydroxyl-terminated hyperbranched poly isocyanurate-ester retanning agents Type de document : texte imprimé Auteurs : Ren Long-Fang, Auteur ; Zhao Yong-Xia, Auteur ; Zhang Hua, Auteur Année de publication : 2017 Article en page(s) : p. 240-249 Note générale : Bibligor. Langues : Américain (ame) Catégories : Chromatographie sur gel Cuirs et peaux -- Propriétés mécaniques Essais dynamiques Fourier, Spectroscopie infrarouge à transformée de Polyisocyanurate ester Polymères -- Synthèse Polymères à terminaison hydroxyle Polymères ramifiés Résonance magnétique nucléaire Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : AB2 monomer was synthesized by Michael addition of diethanolamine (DEA) and methyl acrylate (MA). Then the hydroxyl-terminated hyperbranched poly isocyanurate-ester with different generations (HPICEs) which were named as HPICE-I, HPICE-II and HPICE-III, were prepared respectively via three-(2-hydroxycthyl) isocyanurate (THEIC) and AB2 monomer in which THEIC was used as the core and AB2 monomer as the branching unit. The structure and mass of HPICEs were characterized by Fourier Transform Infrared Spectra (FT-IR), nuclear magnetic resonance hydrogen spectra (•H-NMR) and gel permeation chromatography (GPC). HPICEs were applied in the retanning process of wet blue leather. The results show that when the dosage of HPICEs retanning agent is 3% (basing on the weight of wet blue leather), the properties of leather retanned with HPICE-III are the best compared with those retanned with HPICE-I and HPICE-II. The thickening percentage of the back and belly were 14.88% and 20.54%, respectively. Compared with that of leather retanned with RST, a kind of acrylic retanning agent widely used in the market, the tearing strength, tensile strength and cracking strength of the leather retanned with HPICE-III are increased by 53.31%, 65.69% and 85.28% respectively. All the leather samples retanned by HPICEs exhibited better dry rub fastness but worse wet rub fastness than that retanned by RST. In addition, the samples present better surface properties as well. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Synthesis of HPICE - Solid content testing - Solubility testing - the pH testing - Fourier Transform Infrared Spectroscopy (FT-IR) - Nuclear magnetic resonance hydrogen spectra (1H-NMR) - Gel permeation chromatography (GPC)1 - Retanning procedure - Test of thickening percentage - Test of tensile strength, tearing strength and cracking strength - Test of dry and wet rub fastness - Organoleptic properties of retanned leathers - RESULTS AND DISCUSSION : HPICEs characterization solubility - FT-IR analysis - H-NMR analysis - GPC analysis - Result of thickening percentage - Results of tensile strength, tearing strength and cracking strength - Results of dry and wet rub fastness - Optimization of the dosage of HPICE-III - Organoleptic properties En ligne : https://drive.google.com/file/d/1nOroC3Fpkwkl71cCtSTxUZxAk9CISNYA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28822 [article]

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Zirconium-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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 35-39 Titre : Zirconium-oxazolidine combination tannage for sheep garment leather Type de document : texte imprimé Auteurs : Qiang Tao-Tao, Auteur ; Wang Xue-Chuan, Auteur ; Ren Long-Fang, Auteur ; Ren Yong-Qiang, Auteur Année de publication : 2009 Article en page(s) : p. 35-39 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de moutons Oxazolidine Tannage au zirconium Vêtements en cuir Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Increasing environmental consciousness has impacted on the pollution caused by chrome tanning which has become a difficult problem requiring an urgent solution leading to studies on chrome-free tanning system. A new zirconium-oxazolidine combination tanning system has been developed. The amount of zirconium-oxazolidine has been optimized at 2.5 % and 3.0 % (based on limed weight of skins). The influence of ligands on the shrinkage temperature (Ts) of leathers has also been studied and zirconium-oxazolidine combination tanned leathers showed Ts above 92°C. Zirconium-oxazolidine tanned sheep garment leather is much whiter than the chrome tanned, being close to the standard whiteness. The degradation rate of zirconium-oxazolidine combination leather is 18.83 % after 45 days soil burial and is much quicker than that of chrome tanned leather which is 5.78 % after 45 days. SEM observation revealed that the non-degraded surface structure was more regular than that of chrome leather degraded for 30 days. The zirconium-oxazolidine combination tanned leather degraded more easily than chrome leather, which is of benefit for the sustainable development of the leather industry. En ligne : https://drive.google.com/file/d/1gAsQ1dzoIhDiYfMt3nGAiWnl1bznjaNJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5088 [article]

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