Lightening up on energy costs with microspheres / David Gonzalez Amago in EUROPEAN COATINGS JOURNAL (ECJ), (03/2024)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > (03/2024) . - p. 16-21 Titre : Lightening up on energy costs with microspheres : Closed-cell expanded perlite enhances solar reflectance and thermal conduction of solar reflective paint Type de document : texte imprimé Auteurs : David Gonzalez Amago, Auteur ; Christopher Schrul, Auteur Année de publication : 2024 Article en page(s) : p. 16-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Economies d'énergie Formulation (Génie chimique) Isolation thermique Matériaux expansés Perlite (roche) Réflectance Réflectivité thermique Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Demand for residential cooling and the required energy is expected to increase significantly due to global warming. Closed-cell expanded perlite offers weight reductions, increased coverage and better insulation, while enhancing a range of other properties. Note de contenu : - Highly reflective coatings are attracting attention - Lightweight fillers/microspheres - Key characteristics - Closed-cell expanded pelite - CCEP for paints and coatings - Formulations - Results - More flexible, less ageing, better insulation - Very low thermal conductivity - Table 1 : Main formulation and application benefits of using microspheres in paints and coatings - Table 2 : Formulations of a reference and a re-formulated lightweight reflective paint En ligne : https://drive.google.com/file/d/1hrkGblUrFMfuGUXJCL6xL8SpY7dDlJOS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40621 [article]

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Microwave thermally expanded graphene/polyaniline conductive paste for elaborate conductive pattern and conductive polyester fabric fabrication via screen printing / Junrong Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 477-485 Titre : Microwave thermally expanded graphene/polyaniline conductive paste for elaborate conductive pattern and conductive polyester fabric fabrication via screen printing Type de document : texte imprimé Auteurs : Junrong Zhu, Auteur ; Weihua Song, Auteur ; Jun Peng, Auteur ; Yunjie Yin, Auteur ; Bo Xu, Auteur ; Chaoxia Wang, Auteur Année de publication : 2022 Article en page(s) : p. 477-485 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Conducteurs organiques Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Matériaux expansés Micro-ondes Polyacrylonitrile Polyesters Textiles et tissus synthétiques Traitement thermique Index. décimale : 667.9 Revêtements et enduits Résumé : This work reports the preparation and application of microwave thermally expanded graphene (G)/polyaniline (PANI) conductive paste. The results from XRD revealed that the polyaniline did not change its crystal structure after being combined with microwave thermally expanded graphene. FTIR and Raman spectra revealed that there was a strong π–π interaction between polyaniline and microwave thermally expanded graphene. The resultant conductive pastes possess obvious shear-thinning phenomenon, which are suitable for screen printing to produce conductive circuits. The printed polyester fabric showed significant conductivity which can be tuned by changing the printing time and line length. This study paves the way to large-scale fabrication of flexible conductive circuits for various applications. Note de contenu : - Experimental : Materials - Preparation of thermally expanded graphene by microwave - Preparation of G/PANI conductive paste - Preparation of G/PANI conductive paste fabric with screen printing - Characterization - Result and discussion DOI : https://doi.org/10.1007/s11998-021-00530-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00530-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37279 [article]

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A study on characteristics of lightweight split leather using foam technology / Eun-Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 49-54 Titre : A study on characteristics of lightweight split leather using foam technology Type de document : texte imprimé Auteurs : Eun-Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 49-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères Cuirs et peaux Fixation (chimie) Matériaux expansés Microcapsules Moussage (chimie) Pénétration (physique) Polyacryliques Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather is traditionally a high-quality material that is widely used for vehicle interior materials (e.g., automobiles, trains and airplanes) and fashion items (e.g., handbags, shoes and gloves). However, it is heavier than materials such as various fibres and synthetic leather, which makes it unsuitable for modern applications that prioritise lightness, portability and fuel efficiency. In addition, animal skins used as raw materials are structured with collagen protein, which limits the ability to ability to reduce the weight by altering the thickness and chemicals used in its preparation. In this study, we investigated the penetration, fixation, and foaming methods of thermally expandable microcapsules (TEM) in leather manufacturing procedures to reduce the weight of natural leather. Dyeing and fatliquoring were suitable processes for applying TEM to leather, and the combined use of acryl polymers enabled TEM to attach efficiently to the leather tissue. The manufacture of foamed leather under conditions of 20% TEM and 3% fixing agent resulted in an increase in the thickness by >20% and enabled the production of foamed leather with excellent physical properties. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Apparatus - Process of leather manufacturing and measuring of physical properties - Measurements - RESULTS AND DISCUSSION : TEM application experiments for each leather - TEM content-specific application experiments in dyeing/fatliquoring processes manufacturing procedure - Foaming characteristics with time - Fixing agent application experiments - Table 1 : Characteristics of chemicals - Table 2 : Expansion ratio according to leather process En ligne : https://drive.google.com/file/d/1vj_BfNFpV9Ndk1h5_K2xhj5V36BwyZy3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39062 [article]

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A study on characteristics of low-density regenerated leather using chromium-tanned shaving waste / Eun-Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 43-48 Titre : A study on characteristics of low-density regenerated leather using chromium-tanned shaving waste Type de document : texte imprimé Auteurs : Eun-Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir reconstitué Cuirs et peaux -- Déchets -- Recyclage Dérayage Matériaux expansés Microsphères Moussage (chimie) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Shaving scrap is collagen fibre, that is the leather waste occurring during thickness adjustment during the natural leather manufacturing process, and may cause problems such as environmental contamination because of the chromium (Cr) contained when it comes to reclaiming processes. Various studies applying to shaving scrap are currently being conducted in many countries across the world with an initiative by the EU. Amongst those applications, the regenerated leather is being highlighted as a substitute for natural leather. However, since the regenerated leather uses latex as a binder, it accordingly entails a high weight, which is deemed as a disadvantage due to its dense internal tissues compared to other synthetic leathers. To address such disadvantages, this study employed the thermally expandable microspheres (TEMs) to improve its density and light weight by alleviating the internal structure. This is a study on the manufacturing of foamed regenerated leather using shaving scraps. In the study, the shaving scraps were forced to foam at under 100~120°C with consideration for the heat resistance of collagen fibre after applying the thermally expandable microsphere, and then the effect was analysed. In the analysis results, the most effective foaming rate was exhibited when the shaving scraps were treated at under 110°C for 8 minutes using TEMs T110. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Manufacture of regenerated leather - Measurements - RESULTS AND DISCUSSION : Optimisation of foaming conditions - Foaming studies by microsphere content - Table 1 : Microsphere used in this study - Table 2 : SEM images of foaming conditions - Table 3 : Physical properties according to content of microsphere - Table 4 : WVP* and density according to content of microsphere En ligne : https://drive.google.com/file/d/11Uz81wHKO5x9AAvLwpedwpNOepWJST2F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39063 [article]

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