Organosilicon leather coating technology based on carbon peak strategy / Wenkai Wang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 11 p. 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 Polydiméthylsiloxane Le 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 Silylation La 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 film DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38221 [article]

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Soft and non-sticky water-based PUA composite for soft leather finishing / Yuqi Lin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 10 (10/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 10 (10/2024) . - p. 448-458 Titre : Soft and non-sticky water-based PUA composite for soft leather finishing Type de document : texte imprimé Auteurs : Yuqi Lin, Auteur ; Haihang Luo, Auteur ; Heng Li, Auteur ; Huan Wei, Auteur ; Aisong Yao, Auteur ; Decheng HUa, Auteur ; Yi Chen, Auteur ; Haojun Fan, Auteur Année de publication : 2024 Article en page(s) : p. 448-458 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cuirs et peaux -- Finition Dispersions et suspensions Formulation (Génie chimique) Hydrophobie Polyacryliques Polymères en émulsion Polyuréthanes Résistance à l'hydrolyse Réticulants Revêtements anti-adhésion Souplesse (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A soft but non-sticking composite resin, built on waterbased polyurethane (WPU) and polyacrylic resin (PA) with interpenetrating network (IPN) structures was prepared. Specifically, polyacrylic resin emulsions with different cross-linking agents (glycerol methacrylate (GMA), vinyltrimethoxysilane (KH171)) were fabricated first and used as mother liquor, then waterborne polyurethane pre-polymer modified by polydimethylsiloxane (PDMS) to get a hydrophobic surface was dispersed into PA, after post-chain-extension by poly(ether-amine) (D-230) and N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxy silane (KH-602), two kinds of WPU/PA (WPUA) interpenetrating network emulsions were achieved. Thermodynamic compatibility, mechanical properties, anti-sticking performance, and other properties such as glass transition temperature and hydrolysis resistance of WPUAs were investigated in detail. The as-prepared WPUAs exhibits a glass transition temperature close to each other, a wide latex particle size distribution, high light transmittance, and enhanced hydrolysis resistance, indicating the formation of interpenetrating and crosslinking structures between the two components. Benefiting from two polymer chains intertwining and flexible cross-linking, WPUA films exhibited high elasticity (>800%) and low modulus at 100% tension (0.4 MPa), showing desirable flexibility. Under 80°C and 2 kg hot pressing, the leather coating can be easily peeled off, showing excellent anti-sticky properties Note de contenu : - EXPERIMENTAL : - Materials - Preparation of Polyacrylic Resin Emulsions - Preparation of the WPU emulsions - Preparation of the WPUA emulsions - Preparation of WPU, PA, and WPUA films and coating - Characterization - RESULTS AND DISCUSSION : - Structural design of WPU and PA - Elemental and Structural Analysis of Composite - Compatibility of the IPN composites - Hydrophobicity and anti-hydrolysis of WPUA - Soft and anti-sticking properties of the coating - Table 1 : Formulation of WPUA preparation - Table 2 : Degree of damage and adhesion on the specimen surface and anti-sticking level DOI : https://doi.org/10.34314/k5dnwk12 En ligne : https://drive.google.com/file/d/1oAk-NVJDSZG-CIbin0InbE6m4nJgHMt4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41537 [article]

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The effect of glass transition temperature of commercial epoxy-amine coatings on their performance in marine environment / Muhammad Ahsan Bashir ; Heng Li ; Vivian B. Farstad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 919-933 Titre : The effect of glass transition temperature of commercial epoxy-amine coatings on their performance in marine environment Type de document : texte imprimé Auteurs : Muhammad Ahsan Bashir, Auteur ; Heng Li, Auteur ; Vivian B. Farstad, Auteur Année de publication : 2023 Article en page(s) : p. 919-933 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Calorimétrie Epoxy amine Milieu marin Revêtements organiques Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : Glass transition temperature (Tg) of the commercial epoxy–amine marine coatings is among the most important thermo-mechanical properties which determine the performance of the individual coat and the whole coating system. Ingress of (sea) water and temperature are known to have an influence on the Tg of model epoxy–amine coatings. This work shows the use of thermal analysis techniques like temperature-modulated differential scanning calorimetry (MDSC) and dynamic mechanical analysis (DMA) to study the effect of water immersion and immersion temperature on the Tg of four different commercial epoxy–amine coatings. In addition, Fourier transform infrared (FTIR) spectroscopy was used to study the chemical changes that occurred in the epoxy–amine network upon immersion in water at 40 and 60°C. The results obtained clearly show that the Tg is significantly influenced by water and water immersion temperature if the Tg (or the Tg region) of the epoxy–amine coating is lower than the immersion temperature. FTIR results showed that chemical changes can happen in the epoxy–amine network upon water immersion. Practical example of the effect of Tg of coatings on their protective performance has been demonstrated by using the NACE TM-0174 standard’s equipment which showed that the low Tg epoxy–amine coatings will lose their protective properties earlier than the high Tg coatings when exposed to similar test conditions. Note de contenu : - Table 1 : Tg and mixing ratio of the different commercial products used in this work - Table 2 : Comparison of Tgs of four products measured by using reversing heat flow (rev HF), total heat flow (total HF) in MDSC with the Tg estimated from peak of loss modulus (E″) and peak of tan δ - Table 3 : Comparison of Tg of reference sample and the samples taken from different places on NACE cell panels exposed to 65°C for 15 days DOI : https://doi.org/10.1007/s11998-022-00712-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00712-z.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39437 [article]

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