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]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 3 (05-06/2019) . - p. 135-141 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 végétaux Index. 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 samples En ligne : https://drive.google.com/file/d/1vPbiP9usPOvkUanzxPqYIzf_EFe9o9MN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32670 [article]

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Synthesis of tannic acid waterborne polyurethane in application for leather finishing / Haihang Luo in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 3 (05-06/2020)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 3 (05-06/2020) . - p. 129-135 Titre : Synthesis of tannic acid waterborne polyurethane in application for leather finishing Type de document : texte imprimé Auteurs : Haihang Luo, Auteur ; Yang Liu, Auteur ; Benyapathitiwong Ruj, Auteur ; Daolong Cai, Auteur ; Youjie He, Auteur Année de publication : 2020 Article en page(s) : p. 129-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Polymères -- Propriétés thermiques Polymères -- Synthèse Polymères en émulsion Polyuréthanes Résistance à l'humidité:Résistance à l'eau Réticulants Tanins Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : More and more bio-based materials are used in waterborne polyurethanes (WPUs) due to their non-toxic and pollution-free advantages. In this paper, waterborne polyurethanes (WPU) were synthesised from 2, 4-Toluene diisocyanate (TDI-80) and polypropylene glycol (PPG, Mn=1000). Four kinds of WPU leather finishing agents (WPUO, WPU1, WPU2, WPU3) were prepared by adding different contents of the bio-based material tannic acid (TA) as a cross-linking agent. After a series of tests, the results showed that the thermal degradation temperature of WPU films and their tensile strength increased with the rise of TA content. When 0.6g TA was added, the tensile strength and thermodynamic stability reached the highest values, but the elongation at break was the lowest at the same time. The addition of the cross-linking agent TA reduced the hydrophilicity of the WPU film from% 40.8% to 16.2%. In the application of leather finishing, both dry and wet rubbing increased 1 to 2 grades through the introduction of TA and the folding fastness also improved significantly. The molecular chains were more closely arranged, and the distances between the molecules were also reduced on account of the incorporation of TA, resulting in a decrease in water vapour permeability. Based on this, the water contact angle of the finished leather has also increased from 68° to 99°. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Synthesis of TA-based waterborne polyurethane - RESULTS AND DISCUSSION : FTIR spectroscopy - Thermal properties - SEM of the fracture surface of WPU - Emulsion size analysis - Mechanical properties - Water ressistance of WPU films and contact angle of leather surface - Applied properties En ligne : https://drive.google.com/file/d/1SoUJy9s76fuVQsPDJrLoe9qrl0ADdxNd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34241 [article]

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