Modification of faltiquored split by in-situ polymerization of n-butyl-methacrylate / Xu Weixing in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 2 (03-04/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 2 (03-04/2017) . - p. 72-77 Titre : Modification of faltiquored split by in-situ polymerization of n-butyl-methacrylate Type de document : texte imprimé Auteurs : Xu Weixing, Auteur ; Hui Zeng, Auteur ; Jianfei Zhou, Auteur ; Wang Ya-nan, Auteur ; Bi Shi, Auteur Année de publication : 2017 Article en page(s) : p. 72-77 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites Composites -- Propriétés mécaniques 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 -- Propriétés mécaniques Hydrophobie Polyméthacrylate de butyle Pressage à chaud Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As a kind of by-product of leather manufacture, split generally exhibits weak mechanical strengths due to its loose weave structure of collagen fibres. The in-situ polymerization of acrylate monomers has proved to be an effective approach to reinforce the network structure of split in our previous work. However, the split has to be dehydrated by organic solvents so that hydrophobic monomers are able to penetrate into the fibre network and then polymerize in-situ. This process is complicated and may lead to the discharge of effluent containing organic solvents. In fact, traditional fatliquoring process imparts hydrophobicity to leather to some extent. In this study, chrome tanned split was firstly fatliquored and dried into trust. Then n-butyl-methacrylate(nBMA) was directly added into the crust split by drumming. After complete absorption of the monomer, Poly(n-butyl-methacrylate) (PnBMA)/split composite was easily prepared through hot pressing. The mechanical properties of the modified composite were measured to evaluate the reinforcing effect on split. The results suggested that the fatliquoring agents made of natural yolk provided the appropriate hydrophobicity for spin, and thus benefited the subsequent polymerization. The composite with the addition of 20% fatliquoring agent and 50% nBMA showed the best mechanical properties. Hot pressing conditions were optimized to be heated at 65°C for 60 minutes, The tensile strength and tear strength of the PnBMA/split composite prepared at optimum conditions are 37.25N/mm2 and 262.44N/mm, respectively. As a result, the reinforced split is expected to meet the requirement for producing most of leather products with high value-added. Note de contenu : - MATERIAL AND METHODS : Materials - Preparation of PnBMA/split composites with different dosages of nBMA - Preparation of PnBMA/split composites with different hot pressing conditions - Characterisation of compatability between fatliquoring agent and nBMA monomers - Measurements and instruments - RESULTS AND DISCUSSION : Effect of type and dosage of fatliquoring agents on mechanical properties of PnBMA/split composites - Effect of the dosage of nBMA on mechanical properties of PnBMA/split composites - Effect of heating process on mechanical properties of PnBMA/split composites En ligne : https://drive.google.com/file/d/1ZGlQqlFevQzSV_A_w76q60lBXEbBrY01/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28513 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18878	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The reinforcement of leather split by constructing an interpenetrating network via in-situ recombination of PVA / Xu Weixing in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 8 (08/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 8 (08/2018) . - p. 255-263 Titre : The reinforcement of leather split by constructing an interpenetrating network via in-situ recombination of PVA Type de document : texte imprimé Auteurs : Xu Weixing, Auteur ; Hui Zeng, Auteur ; Jianfei Zhou, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 255-263 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Composites -- Propriétés mécaniques Composites -- Propriétés thermiques Cuirs et peaux Matériaux -- Renforcement Polyacétate de vinyle Polymères -- Propriétés mécaniques Potentiométrie Réseaux polymères Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In order to improve the quality and utilization of leather split, the strength of leather split should be enhanced. The in-situ polymerization of some monomers has proven to be an effective approach in constructing an interpenetrating network (IPN) in split and increasing its strength. But this method is almost unacceptable in practice because of the use of volatile monomers and organic solvents. In this study, a new method to construct the IPN structure in split, in-situ recombination, was developed. Polyvinyl alcohol (PVA) was used as compositing agent, and its molecular structure and modification conditions were optimized. Scanning electron microscope (SEM), potentiometric analyzer and differential scanning calorimeter (DSC) were used to characterize the mechanism of in-situ recombination. The results suggested that PVA with an average polymerization degree of 500 and an average alcoholysis degree of 88% could enhance the strength of split most effectively through compositing reaction of PVA and split in 5% PVA aqueous solution for 120 min under 80°C and pH 7.0. The IPN structure was successfully constructed between PVA and collagen fibers via in-situ recombination. A method to enhance the strengths of leather split with practical application was established. Note de contenu : - EXPERIMENTAL : Materials and equipment - Preparation of PVA/split composites - Measurements and instruments - RESULTS AND DISCUSSION : Effect of compositing time on mechanical properties of PVA/split composites - Effect of polymerization degree and alcoholysis degree of PVA on mechanical properties of PVA/split composites - Effect of PVA concentration on mechanical properties of PVA/split composites - Morphology analysis of PVA/split composite - Potentiometric analysis of PVA/split composite - Thermal behavior of PVA/split composite En ligne : https://drive.google.com/file/d/1k-il4rNBlYeS-mLyrSM8DIC2KCqz1VkM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30842 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20115	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Two-stage temperature change chrome tanning : A more sustainable tanning process / Hui Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 5 (05/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 5 (05/2019) . - p. 153-162 Titre : Two-stage temperature change chrome tanning : A more sustainable tanning process Type de document : texte imprimé Auteurs : Hui Zeng, Auteur ; Weixing Xu, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 153-162 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Caractérisation 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 -- Propriétés mécaniques Cuirs et peaux de bovins Surfaces -- Analyse Tannage au chrome Température Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Under the guidance of molecular simulation of Cr(III) species in water solution, a novel chrome tanning process, the two-stage temperature change chrome tanning, was developed. In stage I, the pickled cattle hide was first tanned by a small amount of chrome tanning agent under room temperature to obtain basic hydrothermal stability. Then, in stage II, the pre-tanned wet-blue was tanned again under a high temperature (≥ 60°C) to enhance the reactivity of Cr(III) with collagen fibers. The shrinkage temperature of crusts, the absorptivity of chrome tanning agent and fatliquoring agent, the mechanical property and surface morphology of crusts were characterized to evaluate the tanning effect. The results showed that when the dosage of chrome tanning agent in two stages was 2 wt% (tanned under room temperature) and 1 wt% (tanned under 60°C), respectively, the best performances of crust were achieved. In these conditions, the shrinkage temperature of crust was 104.6°C. The comprehensive absorptivity of chrome tanning agent reached up to 96.3%. The absorptivity of fatliquoring agent in wet-blue was 90.2%. The mechanical property and grain fineness of the crust were comparable to those of conventional chrome tanned crust with 6 wt% chrome tanning agent. As a result, an efficient and more sustainable chrome tanning process with less offer of chrome tanning agent was achieved. Note de contenu : - EXPERIMENTAL : Materials and equipment - preparation of chrome tanned samples (wet-blue/crusts) - The main Cr(III) species under different temperature - Measurements and instruments - RESULTS AND DISCUSSION : The states of Cr2(SO4)3 in water solution at penetration stage and combination stage of chrome tanning - Effect of tanning conditions on properties of wet-blue/crusts - Effect of tanning conditions on Ts of crusts - Effect of tanning conditions on comprehensive absorptivity of chrome tanning agent - Effect of tanning conditions on Cr2O3 content of wet-blue - Effect of tanning conditions on mechanical property of crusts - Effect of tanning conditions on grain morphology of crusts - Effect of tanning conditions on the chrome distribution in experimental wet-blue - Further optimization of the temperature change chrome tanning technology - Effect of chrome tanning agent dosage in stage II on tanning effect of experimental wet-blue/crusts - Effect of the chrome tanning agent dosage in stage II on the properties of experimental crusts En ligne : https://drive.google.com/file/d/1wQIwx4fNXcMH-sJ-KpQZiW-bbAkzYMCd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32475 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20910	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)