Investigation of high penetration and dispersion of functional nanoparticles in leather / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 9 (09/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 9 (09/2023) . - p. 386-395 Titre : Investigation of high penetration and dispersion of functional nanoparticles in leather Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Nan Sun, Auteur ; Xue-pin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : p. 386-395 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Cuirs et peaux -- Propriétés mécaniques Matériaux -- Propriétés fonctionnelles Nanoparticules Pénétration (physique) Polyacryliques Retannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of nanoparticle-based functional leather products has stimulated sustainable growth of the conventional leather industry. However, functional nanoparticles (FNPs) face challenges to be well penetrated and dispersed in leather because of their aggregation and mismatch charges with leather. In this study, the acrylic resin (AR) retanning agent, which was originally utilized in leather processing, was applied for the modification of FNPs. It has been demonstrated that AR can improve the electrostatic and steric repulsion among nanoparticles, inhibiting their aggregation and ensuring their penetration and dispersion in leather. Because of the limitation of leather porosity, the maximum loading amount for FNPs was about 40wt% (based on leather weight). The leather got higher results in fullness, thickening ratio, and tensile strength when the loading amount of FNPs was 11.25%. Moreover, the proposed approach in this study can be used well for other types of FNPs loaded in leather, suggesting its broad applicability. Note de contenu : - MATERIALS AND METHODS : Materials - Modification of FNPs - Physicochemical properties of modified FNPs - Penetration of modified FNPs in leather - Effect of different factors on the penetration of FNPs in leather - Influence of FNPs on the mechanical performance of leather - RESULTS AND DISCUSSION : Basic properties of modified FNPs - Analysis of the dispersibility of modified Gd2O3FNPs in water - Penetration of pristing/modified FNPs in leather - Effect of different factors on the penetration and dispersion of modified FNPs in leather - Influence of modified FNPs on the orgnaoleptic and physical performance of leather - Table 1 : Retanning processes DOI : https://doi.org/10.34314/jalca.v118i9.8192 En ligne : https://drive.google.com/file/d/10908iVZoLJzZjsvx-zHjmXixuJudFNla/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39829 [article]

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Preparation of formaldehyde-free melamine resin using furfural as condensation agent and its retanning performances investigation / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 6 (06/2018) . - p. 198-206 Titre : Preparation of formaldehyde-free melamine resin using furfural as condensation agent and its retanning performances investigation Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Li Pei-Lin, Auteur ; Jian-Fei Zhou, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 198-206 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Douceur (toucher) Epaisseur -- Mesure Formaldéhyde -- Suppression ou remplacement Fourier, Spectroscopie infrarouge à transformée de Furfural Mélamine -- Synthèse Potentiel zeta Retannage Spectroscopie de la résonance magnétique nucléaire Taille des particules Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Amino resins are one of the most important retanning agents used in the leather industry. However, the generally presence of formaldehyde greatly restricts the widespread application of amino resins. In this study, furfural, an organic compound derived from biomass material, was used to substitute for formaldehyde in the synthesis of melamine resin based on an alkaline-acid procedure. The as-synthesized formaldehyde-free melamine resin (MRf) showed excellent performances in leather processing. FTIR and 13C-NMR were used to characterize the chemical structure of MRf. The particle size as well as zeta potential were also determined. The retanning performances of MRf indicated that the overall performances of MRf are comparable to conventional formaldehyde contained melamine resin (MR) and commercial melamine resin (CMR). In particular, the thickness of the leather retanned by MRf was enhanced around 10.33%, which is significantly higher than that of controls MR (6.16%) and CMR (5.94%). Color measurements showed that MRf imparted leather with higher dark intensity. This present work demonstrated that furfural could be a potential candidate to replace formaldehyde in the production of formaldehyde-free melamine resin. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of MRf resin - CHARACTERIZATION OF MRF : Fourier Transform Infrared (FTIR) spectroscopy analysis - Nuclear Magnetic Resonance ( NMR) analysis - Particle size and zeta potential determination - RETANNING PERFORMANCES OF MRF : Physical and mechanical characteristic of leather - Color measurements - Analysis of free formaldehyde content in leather - RESULTS AND DISCUSSION : Preparation of MRf - FTIR spectroscopy analysis of MRf resin - C NMR spectroscopy analysis - Particle size and zeta potential - RETANNING PERFORMANCES OF MRF : Absorption, thickening and softness of leather - Physical and mechanical characteristics of leather - Shrinkage temperature of leather, chromium concentration in spent liquor and formaldehyde content in leather - Color measurements En ligne : https://drive.google.com/file/d/12CWMptyjoA2fiMqA2-t3PL-Scy5xhxRO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30689 [article]

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Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 1 (01/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 1 (01/2023) . - p. 23-35 Titre : Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : p. 23-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Caractérisation Cuir -- Teneur en formaldéhyde Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Granulométrie Mélamine -- Synthèse Mélamine à faible teneur en formaldéhyde Potentiel zeta Retannage Stabilité au stockage Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Diethanolamine, epichlorohydrin (ECH), and lysine were used to change the traditional synthesis route to address the formaldehyde emission issue of melamine resin (MR), and a novel waterborne MR retanning agent with ultralow formaldehyde content (MUF) was finally obtained. The structure of MUF was characterized by Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy, and its retanning performances in wet-blue and wet-white leathers were thoroughly investigated. Results showed that the formaldehyde content of MUF was 28.05 mg/kg, which was greatly lower than that of traditional MR (3550.23/2543.45 mg/kg), and the formaldehyde contents of chrome- and TWLZ-tanned leathers retanned by MUF were only 12.68 and 8.98 mg/kg, respectively. The thickening rates of MUF-retanned leather were up to 13.40% (chrome-tanned leather) and 9.58% (TWLZ-tanned leather), and MUF showed a satisfying overall performance in retanning leather. MUF is highly promising in practical application owing to its ultralow formaldehyde content, excellent stability in aqueous solution, and satisfactory retanning behaviors. Note de contenu : - MATERIALS AND METHODS : Materials - MUF preparation - TRP synthesis - CCI preparation - MUF synthesis - Characterizatio of intermediate and final products Fourier transform infrared (FTIR) spectroscopy analysis - Nuclear magnetic resonance (NMR) spectroscopy - X-ray photoelectron spectroscopy (XPS) analysis - Storage stability and release of formaldehyde content during storage - Particle size and isoelectric point (pI) analysis - Absorption of retanning and fatliquoring agents - Thickening rates of retanned leather - Physical and mechanical strength of leather - Determination of free formaldehyde content in leather - RESULTS AND DISCUSSION : Characterization of retanning agents (FTIR analysis - NMR - XPS analysis) - Storage stability and formaldehyde determination of retanning agents - Particle size and zeta potential - Retanning performances of MUF : Absorption rates of retanning and fatliuqoring agents - Physical and mechanical strengths - Determination of free formaldehyde in leather - Table 1 : Wet-blue retanning processes - Table 2 : Wet-white retanning processes DOI : https://doi.org/10.34314/jalca.v118i1.6413 En ligne : https://drive.google.com/file/d/1qaCrrRJcWk_9qkGPtrNZylyJt7DVhboY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39162 [article]

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Synthesis of a waterborne melamine resin and its retanning behaviors investigation / Ning Guo-Qiang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 7 (07/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 7 (07/2022) . - p. 288-295 Titre : Synthesis of a waterborne melamine resin and its retanning behaviors investigation Type de document : texte imprimé Auteurs : Ning Guo-Qiang, Auteur ; Zhou Ji-Bo, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : p. 288-295 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Analyse spectrale Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Polymères -- Synthèse Polymères en émulsion Potentiel zeta Résonance magnétique nucléaire Retannage Stabilité au stockage Taille des particules Tannage synthétique Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Wet-white (tannage) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Recently, the application of waterborne melamine resin (WMR) is greatly increasing in the leather industry because of its convenient operation, but it often suffers from poor storage stability. Here, two waterborne melamine resin retanning agents (WMRs) with high storage stability were prepared using melamine, glutaraldehyde and collagen hydrolysates (CHs) as raw materials at different mole ratios. FTIR, 13C-NMR and XPS were used to characterize the chemical structure of synthesized resins, and their retanning behaviors for wet blue and wet white leather were fully investigated. The particle sizes of WMR1 and WMR2 were 28.73 nm and 8.78 nm, and their zeta potentials were 4.0 and 4.5, respectively. The introduction of CHs provided not only good water solubility but also amphoteric properties to synthesized resins, thereby resulting in high absorption of retanning and fatliquoring agents. Moreover, the retanning application investigation of WMRs manifested good storage stability and excellent overall performance, which are comparable with commercial retanning agents. This work showed that glutaraldehyde and CH could be used as starting materials in the synthesis of environmentally friendly WMR. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of WMRs - Characterization of WMRs UV absorption spectral analysis - Nuclear magnetic resonance (NMR) analysis - Fourier Transform Infrared (FTIR) spectroscopy analysis - X-ray photoelectron spectroscopy (XPS) analysis - Storage stability - Particle size and zeta potential determination - Retanning performances - Absorption - Physical and mechanical characteristics of leather - RESULTS AND DISCUSSION : C NMR spectroscopy analysis - UV absorption spectra - FTIR spectroscopy analysis of MCH - XPS analysis - Storage stability - Particle size and zeta potential - Retanning performances of WMRs absorption - Physical and mechanical characteristics of leather - Table 1 : Retanning processes of wet blue leather - Table 2 : Retanning processes of wet white leather DOI : https://doi.org/10.34314/jalca.v117i7.5965 En ligne : https://drive.google.com/file/d/1lC8V5ZDreEymWV1WtLduWpi9cz2rJl02/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37821 [article]

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