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Novel titanium (IV) tanning for leathers with superior hydrothermal stability / Biyu Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)
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Titre : Novel titanium (IV) tanning for leathers with superior hydrothermal stability : II. The influence of organic ligands on stability and tanning power of titanium sulfate solutions Type de document : texte imprimé Auteurs : Biyu Peng, Auteur ; Dennis C. Shelly, Auteur ; Haojun Fan, Auteur ; Keyi Ding, Auteur ; Bi Shi, Auteur Année de publication : 2007 Article en page(s) : p. 261-270 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A key objective for improving titanium tanning power is increasing titanium solution stability and adjusting both the states and behaviors of the Ti(IV) species in aqueous solution so that titanium tanning can be carried out at a suitable (high) pH. The influence of 35 organic ligands, including mono and multiple carboxylates, amino-ligands and hydroxyl-carboxylates, on the stability and tanning power of titanium sulfate liquors were investigated. Results show that only some hydroxylcarboxylates, such as lactate, tartrate, citrate, sulfosalicylate etc., can effectively improve titanium sulfate solution stability. Only these ligands form stable chelate-type coordination compounds with Ti4+, as shown by potentiometic titration, FTIR spectroscopy and elemental analysis of the coordination complexes. Among these hydroxylcarboxylates, the lactate-masked titanium sulfate system at 0.40-0.5:1 mole ratio of lactate to Ti4+ has the best tanning power. Lactate has a relatively small molecular volume as well as a moderately high formation constant with Ti4+. Leather tanned by a lactate-masked titanium sulfate liquor had the highest titanium content, the best titanium distribution uniformity, a shrinkage temperature, Ts, of 97oC with pleasing softness. En ligne : https://drive.google.com/file/d/1-5vllioomW0H33vW-w9rb7HI-EJHNB2U/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3342
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 9 (09/2007) . - p. 261-270[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008213 - Périodique Bibliothèque principale Documentaires Disponible Novel titanium (IV) tanning for leathers with superior hydrothermal stability / Biyu Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 10 (10/2007)
[article]
Titre : Novel titanium (IV) tanning for leathers with superior hydrothermal stability : III. Study on factors affecting titanium tanning and an eco-friend titanium tanning method Type de document : texte imprimé Auteurs : Biyu Peng, Auteur ; Dennis C. Shelly, Auteur ; Haojun Fan, Auteur ; Keyi Ding, Auteur ; Bi Shi, Auteur Année de publication : 2007 Article en page(s) : p. 297-305 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel eco-friendly titanium tanning system based on lactate-masked titanium sulfate solution as the tanning agent was developed. This approach offers enhanced tanning power, compared to previous system. The factors affecting this type of titanium tanning were investigated. The results showed that a conventional pickling process with high NaCl concentration was not suitable for titanium tanning while a pickle-less or salt-free pickling with titanium tanning increased shrinkage temperature (Ts) more than 10oC. The optimum tanning conditions were 7.5%-10% TiO2 offer (based on pelt weight with 65% moisture content), 30% titanium solution basicity and pH 3.5 tanning ending pH (basified by sodium bicarbonate or magnesium oxide). Proper pre-fatliquoring resulted in better titanium tanning agent penetration into the skin. But the pre- and post-treatment with multicarboxylates, acrylic resins and glyoxlic acid did not improve titanium combination with collagen. The shrinkage temperature of the leather was 102oC. The white titanium tanned leather had better strength and fullness than the chrome tanned leather control. But the spongy feel of titanium tanned leather was inferior to chrome tanned leather but superior to aluminum and zirconium tanned leather. The titanium absorption rate was more than 99% and no sodium chloride and/or ammonium salt were discharged. En ligne : https://drive.google.com/file/d/18MW-CoIem5meNGo-oG3EmzjdondA-nDt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3323
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 10 (10/2007) . - p. 297-305[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008304 - Périodique Bibliothèque principale Documentaires Disponible Organosilicon leather coating technology based on carbon peak strategy / Wenkai Wang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
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Titre : Organosilicon leather coating technology based on carbon peak strategy Type de document : texte imprimé Auteurs : Wenkai Wang, Auteur ; Haojun Fan, Auteur ; Lijiang Song, Auteur ; Zhenya Wang, Auteur ; Heng Li, Auteur ; Jun Xiang, Auteur ; Qiang Huang, Auteur ; Xiangquan Chen, Auteur Année de publication : 2022 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Cuir synthétique
Gaz à effet de serre -- Réduction
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Revêtements -- Propriétés mécaniques
Revêtements organiques
SilylationLa silylation est l'introduction d'un groupe silyle, généralement substitué (R3Si–), dans une molécule.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Based on the demand of carbon peak and carbon emission reduction strategy, divinyl-terminated polydimethylsiloxane (ViPDMSVi), poly(methylhydrosiloxane) (PMHS), divinyl-terminated polymethylvinylsiloxane (ViPMVSVi), and fumed silica were used as primary raw materials, polydimethylsiloxane (PDMS) synthetic leather coating was in situ constructed by thermally induced hydrosilylation polymerization on the synthetic leather substrate. The effect of the viscosity of ViPDMSVi, the active hydrogen content of PMHS, the molar ratio of vinyl groups to active hydrogen, the dosage of ViPMVSVi and fumed silica on the performance of PDMS polymer coating, including mechanical properties, cold resistance, flexural resistance, abrasion resistance, hydrophobic and anti-fouling properties were investigated. The results show that ViPDMSVi with high vinyl content and PMHS with low active hydrogen content is more conducive to obtaining organosilicon coating with better mechanical properties, the optimized dosage of ViPMVSVi and fumed silica was 7 wt% and 40 wt%, respectively. In this case, the tensile strength and the broken elongation of the PDMS polymer coating reached 5.96 MPa and 481%, showing reasonable mechanical properties for leather coating. Compared with polyurethane based or polyvinyl chloride based synthetic leather, the silicon based synthetic leather prepared by this method exhibits excellent cold resistance, abrasion resistance, super hydrophobicity, and anti-fouling characteristics. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PDMS synthetic leather - Characterization
- RESULTS AND DISCUSSION : FT-IR analysis of PDMS polymer film - Mechanical properties of PDMS polymer coating - Characteristics of PDMS synthetic leather coating
- Table 1 : Surface energy and their parameters of the test liquids
- Table 2 : Effect of ViPDMSVi viscosity on mechanical properties of PDMS polymer film
- Table 3 : Effect of ViPDMSVi mixture with different viscosity on mechanical properties of PDMS polymer film
- Table 4 : Effect of active hydrogen content on mechanical properties of PDMS polymer film
- Table 5 : Effect of molar ratio of vinyl groups to active hydrogen on mechanical properties of PDMS polymer film
- Table 6 : Effect of ViPMVSVi mass fraction on mechanical properties of PDMS polymer film
- Table 7 : Effect of fumed silica mass fraction on mechanical properties of PDMS polymer filmDOI : https://doi.org/10.1186/s42825-022-00101-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00101-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38221
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 11 p.[article]Oxygen plasma treated polyurethane leather coating with enhanced water vapour permeability / Chen Yi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 5 (09-10/2010)
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Titre : Oxygen plasma treated polyurethane leather coating with enhanced water vapour permeability Type de document : texte imprimé Auteurs : Chen Yi, Auteur ; Liu Yan, Auteur ; Chen Shaohua, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2010 Article en page(s) : p. 205-211 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
Hydrophilie
Microscopie électronique à balayage
Perméabilité
Polymérisation sous plasma
Polyuréthanes
Spectroscopie de photoélectrons
Vapeur d'eauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Oxygen plasma treatment was employed to modify polyurethane (PU) leather coating for enhancing water vapour permeability (WVP). Surface morphology, surface chemical composition and surface hydrophilicity of the treated coating were investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and contact angle/surface energy/equilibrium water sorption analysis respectively. SEM micrographs showed that oxygen plasma treatment. As a result, the surface hydrophilicity of the treated coating was improved, which was demonstrated by decreased contact angle, increased surface energy and increased equilibrium water sorption. Due to the improved surface hydrophilicity, the WVP increases from 611g/m2.day to 157g/p2day for synthetic leather were observed respectively. Simultaneously crucial mechanical properties of the PU leather coating, such as tensile strength, elongation at break and elasticity modulus were not sacrificed by the plasma treatment. En ligne : https://drive.google.com/file/d/1jZ6gmE0ozoYS2njLNkBnJKEqdIBmstYD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10000
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 5 (09-10/2010) . - p. 205-211[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012501 - Périodique Bibliothèque principale Documentaires Disponible Particle size evolution of chrome tanning agent on tanning effect / Yahui Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 8 (08/2019)
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Titre : Particle size evolution of chrome tanning agent on tanning effect Type de document : texte imprimé Auteurs : Yahui Wang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Yan, Auteur Année de publication : 2019 Article en page(s) : p. 279-286 Note générale : Bibliogr. Langues : Américain (ame) 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.
pH -- Mesure
Stabilité hydrothermale
Taille des particules
Tannage au chrome
Température
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In a traditional method of chrome tanning, the particle size (PS) of tanning agent is critical for its penetration and the performance of resultant leather. The temperature, pH value and concentration of chrome solution are the important parameters to influence the size scale of the chromium complex. In present study, the PS evolution of chrome tanning agent (CTA) with pH value and temperature changes was investigated firstly, then the influence of the evolution of PS on the tanning process and hydrothermal stability of crust leather was also investigated. The results indicated that with the temperature varied from 25°C to 30°C and 35°C, the pH of the chrome solution increased from 2.5 to 3.8, the PS of CTA increased from 982 nm to 2899 nm, 1265 nm to 3384 nm and 1289 nm to 3630 nm, respectively, showing a rapid increasing tendency. Correspondingly, due to the PS of CTA increased, the chromium absorption rate increased from 31.0% to 53.6% at 25°C, 33.8% to 55.9% at 30°C and 34.5% to 56.4% at 35°C, whilst the uniformity of the chromium distribution in crust leather was gradually reduced. At the same initial tanning temperature, the shrinkage temperature (Ts) of wet blue tend to increase first and then decrease with the increase of the CTA’s PS, and reached above 100°C when the PS was in a range from 2000 nm-2700 nm. As the PS continues to increase, the inner layer was insufficient tanned due to excessive tanning of surface, leading to a decrease in hydrothermal stability of crust leather. Note de contenu : - EXPERIMENTAL : Materials - Preparation chrome tanning solution with different pH value - Particle size measurement - Tanning trial - Property assessments of tanned leathers determination of chromium concentration in spent tanning solutions - Determination of chromium content and distribution in tanned leathers - Shrinkage temperature of tanned leathers
- RESULTS AND DISCUSSION : Evaluations PS of CTA with pH and temperature - The effect of PS on absorptivity of chromium - Effect of PS on chromium distribution in tanned leathers - Hydrothermal stability of tanned leathersEn ligne : https://drive.google.com/file/d/1FFPGoUDxNCsOlGVOtl9FbehxOfxCTAjU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32787
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Code-barres Cote Support Localisation Section Disponibilité 21087 - Périodique Bibliothèque principale Documentaires Disponible Particle size evolution of melamin-formaldehyde tanning agent on tanning effect / Mengmeng Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 5 (05/2018)
PermalinkPhosphorus-nitrogen flame retardant waterborne polyurethane/graphene nanocomposite for leather retanning / Peikun Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 5 (05/2018)
PermalinkA polyurethane-based retanning agent with fluorescent effect / Saiqi Tian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 4 (04/2016)
PermalinkPreparation and characteristics of graphene-based polymeric leather fatliquor / Zhenyu Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 9 (09/2020)
PermalinkPreparation and properties of thermally expandable microspheres for foam coating / Guodong Huang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 7 (07/2021)
PermalinkPreparation, mechanical and thermal properties of polydimethylsiloxane coating for synthetic leathers / Zhe Sun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)
PermalinkSilica-embedded polyurea microspheres with rough surface for matte leather finishing / Liang Jia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 5 (05/2022)
PermalinkSustainable and invisible anti-counterfeiting inks based on waterborne polyurethane and upconversion nanoparticles for leather products / Jun Xiang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
PermalinkTanning characteristics and tanning mechanism of nano-SiO2 / Haojun Fan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 4 (07-08/2004)
PermalinkThe biodegradabilities of rape oil-based fatliquors prepared from different methods / Zhaoyang Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 4 (04/2010)
PermalinkThe water vapour permeability of leather finished by thermally responsive polyurethane / Haojun Fan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 3 (05-06/2005)
PermalinkThermally responsive collagen switching from bactericidal for ambient storage condition to biologically inert in vivo / Jinming Chang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 4 (04/2018)
PermalinkWaterborne dimethylolpropionic acid-diisocyanate adducts with alkali-deblockable isocyanate groups as pretanning agent for chrome tanning / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 2 (02/2015)
PermalinkWaterborne polyurethane/O-MMT nanocomposites for flame retardant leather finishing / Zhang Xiuli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 2 (03-04/2010)
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