A leather coating with self-healing characteristics / Feifei Liang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 5 p. Titre : A leather coating with self-healing characteristics Type de document : texte imprimé Auteurs : Feifei Liang, Auteur ; Tianyou Wang, Auteur ; Haojun Fan, Auteur ; Jun Xiang, Auteur ; Yi Chen, Auteur Année de publication : 2020 Article en page(s) : 5 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir Polymères autoréparants Polyuréthanes Revêtement autoréparant Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Genuine leather is often coated before making daily necessities such as shoes, clothing, bags, sofas, car seats, etc., so as to impart leather products various colours, higher wear resistance and water resistance and so on. However, the coating of these products is often damaged in daily use which will decrease its aesthetic effect and practicability. Therefore, how to improve the scratch resistance of leather coatings has been puzzling people all the time. It is a common knowledge that animals and plants can repair the injured biological tissues by himself. According to this principle, here, we prepared a type of self-healing water-borne polyurethane with disulfide bond in the main chain by using HEDS as chain extender, and the self-healing system was triggered by the disulfide bonds with the help of shape memory function of waterborne Polyurethane, self-healing experiments how that the damaged of leather coating can be repaired fully at 60 °C for 12 h. Note de contenu : - Table 1 : Mechanical properties variation of polyurethane film before and self-healing DOI : https://doi.org/10.1186/s42825-020-0018-4 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-0018-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37329 [article]

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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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Preparation 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)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 9 (09/2020) . - p. 337-346 Titre : Preparation and characteristics of graphene-based polymeric leather fatliquor Type de document : texte imprimé Auteurs : Zhenyu Zhang, Auteur ; Mengjie Cui, Auteur ; Zhonghui Wang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Xiang, Auteur ; Jun Yan, Auteur ; Jixin Ning, Auteur Année de publication : 2020 Article en page(s) : p. 337-346 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Blindage (électricité) Caractérisation Essais (technologie) Essais de comportement au feu Oxyde de graphène Produits de nourriture du cuir Résistance au rayonnement ultraviolet Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although the research of leather chemicals has experienced considerable advances, it remains imperative and challenging to develop functional ones ; especially functionalized fatliquors or retanning agents. In consideration with the unique structure and properties, graphene oxide (GO) has been reported as a potential alternative to ameliorate the performance of leather. However, one of the intractable handicaps is how to make graphene penetrate evenly and react with collagen fibers. Here, we demonstrate a method for preparing graphene-based polymeric fatliquor (PFGO) via an amidation reaction between amino-groups of aminated graphene (AGO) and anhydride bonds of maleic anhydride-rapeseed ouf copolymer (MRO), which was synthesized by free radical copolymerization. The results show that the as-prepared fatliquor has good emulsion stability and can penetrate into the collagen fibers uniformly. Compared with the control sample without graphene, the antibacterial, electromagnetic shielding, flame retardant and UV resistance characteristics of the PFGO-treated leather were significantly improved. Overall, this effective yet promising paradigm may provide an achievable solution toward developing graphene-based polymer composites simultaneously with high physical property and high functional performance. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of GO based faltiquor (PFGO) - Fatliquoring process - CHARACTERIZATION AND PERFORMANCE TESTS : Instrument testing - Stability of fatliquor solution - SEM observation of leather - Antibacterial testing of fatliquor - Electromagnetic radiation shielding. Performance testing of leather - Flammability testing of leather - UV-resistance property testing of leather - Thermal stability testing of leather - Mechanical measurements - RESULTS AND DISCUSSION : Characterization of AGO - Characterization of fatliquor - Distribution of fatliquor in leather - Antibacterial property of fatliquor - Electromagnetic shielding performance of leather - Flammability of leather - UV-resistance of fatliquored leather DOI : https://doi.org/10.34314/jalca.v115i9.3849 En ligne : https://drive.google.com/file/d/1v5ccCkackiJzJmgK2tdNNEZKqF3muZUK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34587 [article]

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Preparation 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)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 7 (07/2021) . - p. 249-259 Titre : Preparation and properties of thermally expandable microspheres for foam coating Type de document : texte imprimé Auteurs : Guodong Huang, Auteur ; Zhixian Lin, Auteur ; Haojun Fan, Auteur ; Jun Xiang, Auteur ; Chong Zheng, Auteur ; Zhiqing Luo, Auteur Année de publication : 2021 Article en page(s) : p. 249-259 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. Cuirs et peaux -- Finition Fleur du cuir Formulation (Génie chimique) Microsphères Moussants Mousses plastiques Polyacétate de vinyle Polyacrylonitrile Polymères expansés Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Résistance chimique Réticulation (polymérisation) Revêtements organiques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A type of thermally expandable microspheres (TEMs) for foam coating was prepared by suspension polymerization with acrylonitrile (AN), methyl methacrylate (MMA), vinyl acetate (VAC) as shell polymer monomers and i-pentane as core foaming agent. The effects of an aqueous additive (Sodium Chloride, NaCl) on the size and distribution of TEMs, and the effects of crosslinking degree, i-pentane dosage and monomer mass ratio on the expansion property, expansion temperature and solvent-resistance of TEMs were investigated. The results showed that when the dosage of NaCl was close to the saturation solubility (30%), the dosage of crosslinking agent and alkane were about 0.09% and 7.4%, and the mass ratio of AN/MMA/VAC w rm distribution and good solvent resistance, the expansion diameter ratio was 5 times under 110~120 C, which meets the application requirements for foam coating of leather or synthetic leather. Note de contenu : - MATERIALS AND METHODS : Experimental materials - Preparation of TEMs - Preparation of foaming coating - Finishing of split leather and damaged grain leather - CHARACTERISTICS OF TEMS : Determination of particle size and distribution - Observation on surface morphology - Determination of expansion property and temperature - RESULTS AND DISCUSSION : Structure design of TEMs - Effect of NaCl concentration on the size and distribution of TEMs - Effect of crosslinking degree on the expansion property and temperature of TEMs - Effect of dosage of alkane on expansion property and temperature of TEMs - Effect of monomer mass ratio on expansion property, temperature and solvent resistance of TEMs - Morphology of split leather foam coating - Matting and mending effect of foaming coating - Table 1 : The basic formula for preparing TEMs - Table 2 : Foaming properties and foaming temperature of TEMS with different content of EGDMA - Table 3 : Effect of foaming agent dosage on the expansion property and foaming temperature of thermally expanded microspheres - Table 4 : Effect of monomer ratio on the expansion property and expansion temperature of thermally expanded microspheres DOI : https://doi.org/10.34314/jalca.v116i7.4336 En ligne : https://drive.google.com/file/d/1i1pJAJAQnAwYRmogNbezp7Ho-pyNhhl1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36082 [article]

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Silica-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)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 5 (05/2022) . - p. 184-194 Titre : Silica-embedded polyurea microspheres with rough surface for matte leather finishing Type de document : texte imprimé Auteurs : Liang Jia, Auteur ; Li Wang, Auteur ; Jing Li, Auteur ; Jun Xiang, Auteur ; Yi Chen, Auteur ; Haojun Fan, Auteur Année de publication : 2022 Article en page(s) : p. 184-194 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Finition Microsphères Polymères en émulsion Polyurée Polyuréthanes Rugosité Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A type of polyurea microspheres with rough surfaces and different sizes (1-12 μm), which was used for waterborne polyurethane matte leather coating, were prepared by precipitation polymerization in H 2 O/acetonitrile system, using isophorone diisocyanate as polymerized monomer, 2,4-diaminobenzenesulfonic acid sodium salt as hydrophilic monomer and nano-SiO 2 as surface roughener. The effect of the loading of isophorone diisocyanate and 2,4-diaminobenzenesulfonic acid sodium salt, the volume ratio of H 2 O/acetonitrile and the addition stage of nano-SiO 2 on the particle size and surface roughness were investigated so as to achieve the excellent matte effect of the coating. The results indicated that the adding of hydrophilic monomer can reduce the particle size of microspheres and improve its re-dispersibility in water, while the increase of the proportion of acetonitrile in the mixed solvent and the loading of polymerized monomer can enlarge the size of the polyurea microspheres. As surface roughener, with the increase of nano-SiO 2 loading, the surface roughness and the particle size of microspheres increase. When nano-SiO 2 is added at the stage of the reaction system getting turbid, the maximum surface roughness of polyurea microspheres can be achieved. Polyurea microspheres with particle size (1-2 μm) and high surface roughness have better matting effect, and the gloss of the prepared waterborne polyurethane coating can be adjusted to less than 1.6° (60°-incident Angle). Note de contenu : - EXPERIMENTAL : Materials - Preparation of polyurea microspheres with different surface roughness - Preparation of WPU matte coating - Characterization - RESULTS AND DISCUSSION : Structural of polyurea microspheres - Influence of MPDSA-Na loading on microsphere size and its re-dispersibility - Influence of H2O/AN volume ratio on microsphere size - Influence of IPDI loading on microsphere size - Effect of nano-SiO2 loading on surface roughness of polyurea microspheres - Influence of nano-SiO2 addition stage on surface roughness of polyurea microspheres - Influence of different polyurea microspheres on the gloss of WPU coating - Table 1 : Dn and Dn/Dw of polyurea microspheres at different MPDSA-Na loading - Table 2 : Dn and Dn/Dw of polyurea microspheres at differentH2O/AN - Table 3 : Dn and Dn/Dw of polyurea microspheres at different IPDI loading - Table 4 : Dn and Dn/Dw of polyurea microspheres at different nano-SiO2 loading - Table 5 : The polyurea microspheres with different sizes and size distribution DOI : https://doi.org/10.34314/jalca.v117i5.4913 En ligne : https://drive.google.com/file/d/11yBWz4C1N2hxkNkOsI_QcjBpR8gbfic2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37568 [article]

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Sustainable 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)  

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Synthesis and characterization of large particle size self-matting core-shell acrylic resin / Hao Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 9 (09/2022)  

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