Application of nonionic gemini aliphatic polyurethane surfactant for improving the performance of vegetable tanned leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 11 (11/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 11 (11/2019) . - p. 403-412 Titre : Application of nonionic gemini aliphatic polyurethane surfactant for improving the performance of vegetable tanned leather Type de document : texte imprimé Auteurs : Shuangquan Lai, Auteur ; Yong Jin, Auteur ; Liangjie Shi, Auteur ; Shenghua Wang, Auteur ; Heng Yang, Auteur Année de publication : 2019 Article en page(s) : p. 403-412 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Agents de tannage Collagène Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Morphologie (matériaux) Photostabilité Polymères -- Synthèse Polymères aliphatiques Retannage Surfactants Surfactants -- Synthèse Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tanned leathers with good embossing, air permeability, natural look and pleasing firm handle properties have applied in many goods with multiple uses. However, the performances of vegetable tanned leathers still need a further improvement. In this work, a kind of nonionic gemini aliphatic polyurethane surfactants (GPUs) with different hydrophobic chain lengths as a retanning agent combined with polyacrylic acid (PAA) for condensed tannin tanned leathers to improve their performances. The effects of the alone or combined use of the PAA and GPU, the hydrophobic chain length of GPU, and the offer percentage of retanning agent were studied by evaluating the organoleptic properties, shrinkage temperature, mechanical properties of the obtained leathers. The best performance was found in the leather retanned with PAA and 12-GPU-550 complex retanning agent, and the mechanical properties of leather could be improved when the total offer percentage was controlled at 4 wt%. Moreover, the collagen fibers morphologies and lightfastness properties of leathers retanned with different retanning agents were investigated. The results showed that the total color difference ΔE and the yellowness index Δb decreased significantly with the introduction of 12-GPU-550, and the leather retanned with PAA and 12-GPU-550 complex retanning agent showed the lowest value of ΔE, demonstrating that the lightfastness properties were improved significantly. Therefore, it was an attractive way to combine use of PAA and 12-GPU-550 as complex retanning agent, which can improve the mechanical and lightfastness properties of vegetable tanned leathers simultaneously. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of polyacrylic acid (PAA) - Synthesis of nonionic gemini aliphatic polyurethane surfactants (GPUs) - Application of the synthesized retanning agents - The organoleptic and physical mechanical properties of leathers - Scanning Electron Microscopy analysis of leathers - Light fastness properties of leathers - RESULTS AND DISCUSSION : Effects of different retanning agents on the properties of leathers - Effect of the hydrophobic chain length of GPU on the properties of leathers - Effect of the offer percentage of complex retanning agent on the properties of leathers - SEM analysis of leathers - Effects of retanning agents on the lightfastness properties of leathers En ligne : https://drive.google.com/file/d/1ajQdsq8W9LW8sFu6kytH1lIoq_J-RMzI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33252 [article]

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Application of Y-shaped polyurethane and polyacrylic acid as a complex retanning agent in aldehyde-tanned goat leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 11 (11/2017) . - p. 367-376 Titre : Application of Y-shaped polyurethane and polyacrylic acid as a complex retanning agent in aldehyde-tanned goat leather Type de document : texte imprimé Auteurs : Shuangquan Lai, Auteur ; Yong Jin, Auteur ; Hanping Li, Auteur ; Lei Zhang, Auteur ; Xin Yin, Auteur Année de publication : 2017 Article en page(s) : p. 367-376 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Copolymères -- Synthèse Copolymères séquencés Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de chèvres Glutaraldéhyde Morphologie (matériaux) Polymères amphiphiles Polyuréthanes Retannage Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A kind of Y-shaped amphiphilic block polyurethane copolymers (PUGs) with different molecular weights were successfully synthesized to be used as retanning agent combined with polyacrylic acid (PAA) for modified glutaraldehyde tanned goatskin. The structures of resulting products were characterized by FTIR, and the molecular weights of products were measured with GPC. The application performances were investigated by measuring the organoleptic and physical mechanical properties of resulting leathers according to the alone or combined use of PUG and PAA, the molecular weight of PUG, and the offer percentage of retanning agent. The best performance was found in the leather retanned by PUG750 and PAA complex retanning agent at the total offer percentage of 4 wt%. Finally, the free formaldehyde contents in the leathers retanned with 4 wt% PUG750 and PAA at different pH conditions were analyzed with acetyl acetone colorimetric method. The mechanical properties as well as the fibers morphologies of the experimental and control groups were also investigated. The results demonstrated that when the pH value at the later stage of retanning process was controlled at 4.0 or 3.0, the free formaldehyde content was significantly reduced by 20.3% or 38% respectively ; and the physical mechanical properties of leathers were also very excellent to meet the performance requirements of goatskin garment leathers. According to these results, the method for using PUG and PAA as a complex retanning agent might be a good choice in chrome-free tanning process. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of Y-shaped amphiphilic block polyurethane copolymers (PUGs) - Synthesis of polyacrylic acid (PAA) - Fourier Transform Infrared Spectra (FTIR) - Gel permeation chromatography (GPC) - Application of polyurethanes and polyacrylic acid - Analysis of leather properties - Scanning electron microscopy analysis - Determination of free formaldehyde contents in leathers - RESULTS AND DISCUSSION : Synthesis of polyurethane copolymers and polyacrylic acid - Effect of different retanning agents on the organoleptic and physical properties of leathers - Effect of the molecular weight of PUG on the organoleptic and physical properties of leathers - Effect of the amount of complex retanning agent on the organoleptic and physical properties of leathers - Application of the complex retanning agent under different pH conditions En ligne : https://drive.google.com/file/d/1n0hhgDSLoOspbiCVezGLJhDkXewQevzZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29395 [article]

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Nonionic short-chain fluorinated surfactants in the fatliquoring of chrome-tanned goat skin / Yichao Shen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 7 (07/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 7 (07/2020) . - p. 255-262 Titre : Nonionic short-chain fluorinated surfactants in the fatliquoring of chrome-tanned goat skin Type de document : texte imprimé Auteurs : Yichao Shen, Auteur ; Yong Jin, Auteur ; Shuangquan Lai, Auteur ; Liangjie Shi, Auteur ; Yutang Zhou, Auteur ; Rong Zhou, Auteur Année de publication : 2020 Article en page(s) : p. 255-262 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Caractérisation Chromatographie sur gel Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Douceur (toucher) Fourier, Spectroscopie infrarouge à transformée de Liqueurs de tannage Microscopie électronique à balayage Surfactants fluorés Tannage au chrome Tension superficielle Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Surfactants as essential auxiliaries are used in almost all chemical processes in leather production. In this work, a series of nonionic short-chain fluorinated surfactants (Fn-Fn, where n = 2, 4, or 6) were successfully prepared and used as fatliquoring auxiliaries in the fatliquoring process of chrome-tanned goat skin. The chemical structure of these nonionic short-chain fluorinated surfactants was characterized by FTIR and the molecular weight was determined by GPC. The surface tension measurement results revealed that these three fluorinated surfactants showed excellent surface activities. The effect of type and dosage of Fn-Fn as well as fatliquoring temperature on fatliquoring properties of chrome-tanned goat skin were estimated by the softness and physical mechanical properties characteristic of resultant leather. The results revealed that the leather treated with 1 wt% F4-F4 at the fatliquoring temperature of 40oC showed the best overall performance, whose softness and physical mechanical properties were improved significantly. Moreover, the collagen fiber morphology and waterproof performance of leather treated with Fn-Fn were also investigated which showed that the addition of Fn-Fn in the fatliquoring process could promote the loosening of collagen fibers while effectively enhancing the water repellency of the leather surface. Therefore, such types of nonionic short-chain fluorinated surfactants are promising to be as desired fatliquoring auxiliaries in the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of nonionic short-chain fluorinated surfactants (Fn-Fn) - Fourier Transform Infrared Spectra (FTIR) - Gel permeation chromatography (GPC) - Surface tension measurement - Application of nonionic short-chain fluorinated surfactants - Analysis of leather properties - RESULTS AND DISCUSSION : Synthesis and characterization of nonionic short-chain fluorinated surfactants (Fn-Fn) - Surface properties - Effect of type of Fn-Fn on the softness and physical mechanical properties of leather - Effect of dosage of Fn-Fn on the softness and physical mechanical properties of leather - Effect of fatliquoring temperature on softness and physical mechanical properties - SEM analysis of leather - Contact angle DOI : https://doi.org/10.34314/jalca.v115i7.3833 En ligne : https://drive.google.com/file/d/1jWVv4Z3q7D9OPMovPW4gKqVpNEXR8J3d/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34327 [article]

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Nonionic short fluorocarbon chain surfactants for improving application properties of acrylic resin in the retanning of wet-blue leather / Rong Zhou in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 11 (11/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 11 (11/2022) . - p. 455-464 Titre : Nonionic short fluorocarbon chain surfactants for improving application properties of acrylic resin in the retanning of wet-blue leather Type de document : texte imprimé Auteurs : Rong Zhou, Auteur ; Yong Jin, Auteur ; Shuangquan Lai, Auteur ; Liangjie Shi, Auteur ; Yutang Zhou, Auteur ; Zhangyi Peng, Auteur Année de publication : 2022 Article en page(s) : p. 455-464 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants -- Adsorption Cuirs et peaux de chèvres Polyacryliques Retannage Surfactants Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic resin (AR) is one of the most commonly used leather retanning agents owing to its excellent selective filling property and low cost. However, there are some defects affecting the quality of wet-blue leather in the practical application of AR, such as “excessive convergence”, “detanning”, and “fading”. Herein, the nonionic short fluorocarbon chain surfactants (F6-m) combined with AR for retanning wet-blue goat leather to further improve the application properties of AR. In a series of comparative experiments, the grain surface state and mechanical properties of leather retanned with 4 wt% AR and 2wt% F6-400 are preferred. Moreover, after dyeing, the dye adsorption rate and a* (red-greenness) value of AR/F6-400 retanned leather are higher than that of leather retanned with AR alone. The above issues reveal that F6-400 can improve application properties of AR in the retanning of wet-blue leather to a certain extent, benefiting to further upgrade the quality of leather. Note de contenu : - MATERIALS AND METHODS : Materials - Leather processing - Analysis of leather properties - Morphology - Dye adsorption rate - Color difference analysis - RESULTS AND DISCUSSION : Effects of different retanning systems on leather properties - Effect of the dosage of AR on leather properties - Effect of the dosage of F6-400 on leather properties - Morphology analysis of grain surfaces - Morphology analysis of cross sectin - Dyeing - Table 1 : Process recipe for leather manufacture - Table 2 : Organoleptic properties of Control (C) and Experimental (E) leathers retanned with different retanning systems at total dosage of 4 wt% - Table 3 : Organoleptic properties of leathers retanned with different doasages of 1R and 2 wt% F6-400 - Table 4 : Organoleptic properties of leathers retanned with different dosages of F6-400 and 4 wt% AR - Table 5 : Chroma color difference values of dyed leather DOI : https://doi.org/10.34314/jalca.v117i11.6292 En ligne : https://drive.google.com/file/d/1L4x2PhD01Q9znu2rfshXE86t56N7PsQk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38339 [article]

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A review on room-temperature self-healing polyurethane : synthesis, self-healing mechanism and application / Yupeng Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 22 p. Titre : A review on room-temperature self-healing polyurethane : synthesis, self-healing mechanism and application Type de document : texte imprimé Auteurs : Yupeng Li, Auteur ; Yong Jin, Auteur ; Fan Wuhou, Auteur ; Rong Zhou, Auteur Année de publication : 2022 Article en page(s) : 22 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polymères -- Synthèse Polymères autoréparants Polyuréthanes Index. décimale : 668.9 Polymères Résumé : Polyurethanes have been widely used in many fields due to their remarkable features such as excellent mechanical strength, good abrasion resistance, toughness, low temperature flexibility, etc. In recent years, room-temperature self-healing polyurethanes have been attracting broad and growing interest because under mild conditions, room-temperature self-healing polyurethanes can repair damages, thereby extending their lifetimes and reducing maintenance costs. In this paper, the recent advances of room-temperature self-healing polyurethanes based on dynamic covalent bonds, noncovalent bonds and combined dual or triple dynamic bonds are reviewed, focusing on their synthesis methods and self-healing mechanisms, and their mechanical properties, healing efficiency and healing time are also described in detial. In addition, the latest applications of room-temperature self-healing polyurethanes in the fields of leather coatings, photoluminescence materials, flexible electronics and biomaterials are summarized. Finally, the current challenges and future development directions of the room-temprature self-healing polyurethanes are highlighted. Overall, this review is expected to provide a valuable reference for the prosperous development of room-temperature self-healing polyurethanes. Note de contenu : - DYNAMIC COVALENT BONDS : Disulfide, diselenide, and detelluride bonds - Imine bonds - Boroxine bonds - Alkoxyamine bonds - DYNAMIC NONCOVALENT BONDS : Multiple hydrogen bonds - Metal–ligand coordination bonds - Ionic bonds - COMBINED DUAL OR TRIPLE DYNAMIC BOND SYSTEMS - CURRENT APPLICATIONS OF ROOM-TEMPERATURE SELF-HEALING POLYURETHANES : Leather coatings - Photoluminescence materials - Flexible electronics - Biomaterials - Table 1 : Types and self-healing mechanisms of main dynamic covalent bonds for room temperature self-healing polyurethanes - Table 2 : Types and self-healing mechanisms of main dynamic noncovalent bonds for room-temperature self-healing polyurethanes - Table 3 : Summary of the healing mechanisms, mechanical properties, healing time and healing efficiency of room-temperature self-healing polyurethanes DOI : https://doi.org/10.1186/s42825-022-00097-0 En ligne : https://link.springer.com/content/pdf/10.1186/s428 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38218 [article]

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Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization / Yutang Zhou in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

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Synthesis and application of a new phosphate ester based on nonionic amphiphilic polyurethane as leather fatliquoring agent / Hanping Li in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 12 (12/2016)  

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Synthesis and application of non-bioaccumulable fluorinated surfactants : a review / Rong Zhou in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

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Synthesis and leather application properties of a carboxylated graphene oxide modified waterborne polyacrylate leather finishing agent / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 6 (06/2019)  

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