Anticorrosive self healing coatings / Ajay Chaurasiya in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 56-82 Titre : Anticorrosive self healing coatings Type de document : texte imprimé Auteurs : Ajay Chaurasiya, Auteur Année de publication : 2020 Article en page(s) : p. 56-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Catalyseurs Emulsification Métathèse (chimie) Métaux -- Revêtements protecteurs Microcapsules Monomères Nanocapsules Passivité (Chimie) Polymérisation Revêtement autoréparant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Autonomic healing materials respond without external intervention to environmental stimuli in a nonlinear and productive fashion, and have great potential for advanced engineering systems. Self-healing coatings, which autonomically repair and prevent corrosion of the underlying substrate, are of particular interest. Notably, the worldwide cost of corrosion has been year estimated to be nearly $300 billion per year. Recent studies on self-healing polymers have demonstrated repair of bulk mechanical damage as welI as dramatic increases in the fatigue life. Non-metallic (based on polymers or oxides) and metallic protective coatings are used to protect metal products against the harmful action of the corrosion environment Various approaches for achieving healing functionality encapsulation have been demonstrated, including reversible chemistry, networks, microvascular nanoparticle phase separation, poly-ionomers, fibres hollow and separation. monomer phase. The majority of these systems, however, have serious chemical and mechanical limitations, preventing their use as coatings. Modem engineered coatings are highly optimized materials in which dramatic modifications of the coating chemistry are unlikely to be acceptable. Here, we describe a generalized approach to self-healing polymer-coating systems, and demonstrate its effectiveness for both model and industrial ly important coating systems. Note de contenu : - Definition of self-healing - Design strategies - Release of healing agents - Microcapsule embedment - Hollow fiber embedment - Microvascular system - Reversible cross-links - Diels-Alder (DA) and retro-DA reaction - Ionomers - Supramolecular polymers : Miscellaneous technologies - electrohydrodynamics - CONDUCTIVITY : Shape memory effect - Nanoparticle migrations - Co-deposition - Self-healing corrosion protection coatings polymeric coatings - Protection of mild steel - Protection of aluminium alloy - Protection of magnesium alloy - Coatings containing micro-nanocapsules - Hybrid-oxide coatings - Other self-healing coatings - Self-healing process - experimental analysis for cross cut corrosion resistance test - Others applications - Fig. 1 : Schematic representation of self-healing concept using embedded microcapsules - Fig. 2 : Light microscopic picture of encapsulated DCPD and Grubb's catalyst - Fig. 3 : Ring opening metathesis polymerization of DCPD - Fig. 4 : Optical micrographs of hollow glass fibers - Fig. 5 : Schematic representation of sel-healing concept using hollow fibers - Fig. 6 : Schematic showing self-healing materials with 3D microvascular networks - Fig. 7 : Schematic showing formation of highly cross-Iinked polymer (3M4F) using a multi-diene (four furan moieties, 4F) and multi-dienophile (three maleimide moieties, 3M) via DA reactions - Fig. 8 : Chemical structure of functionalized maleimide and furan monomers - Fig. 9 : Thermally reversible cross-linking reaction between TMI and TF through DA and retro-DA reactions - Fig. 11 : Preparation of thermally reversible polyamides - Fig. 12 : Schematic showing reversible ionic interactions - Fig. 13 : Examples of supramolecular polymers from the literature : main-chain supramolecular polymers and side-chain supramolecular polyemrs - Fig. 17 : Polymeric bis-terpyridine-metal complex (charge and anions omitted) - Fig. 18 : Schematic showing electrohydrodynamic aggregation of particles - Fig. 19 : Schematic showing conductive self-healing materials - Fig. 20 : Representative three-dimensionsl profiles of a spherical indent at load of 15 N fresh indent and after healing above the austenite finish temperature - Fig. 21 : Schematics showing electrolytic co-deposition of microcapsules (or mesoporous nanoparticles containing corrosion inhibitors) with metal ions - Fig. 22 : Schematic illustration of a crack in the epoxy coating - Fig. 23 : Schematic representation of the self-healing effect of the TiO, particle polymer composite coating - Fig. 24 : Schematic Illustration of self healing zipper-like mechanism - Fig. 25 : Schematic Self-healing mechanism of polyelectrolyte multilayers - Fig. 25 : Schematic shows how a capsule is created - Fig. 26 : Schematic shows structure of silane film - Fig. 27 : Epoxy with control, epoxy with corrosion inhibitor and epoxy with self healing additives - Fig. 28 : Schematic showing the reflow effect of self-haling clear coats En ligne : https://drive.google.com/file/d/1Z-i4m7ZBZI117NIGydOCioBCW5SAUQyz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34661 [article]

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In-depth understanding of the leather fatliquoring process : A review / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 1 (01-02/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 1 (01-02/2022) . - p. 13-19 Titre : In-depth understanding of the leather fatliquoring process : A review Type de document : texte imprimé Auteurs : M. A. Habib, Auteur Année de publication : 2022 Article en page(s) : p. 13-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Structure Emulsification Emulsions Huiles et graisses Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tanning involves economic and environmental benefits, it transfers low-value by-products (animal hide and skin) into value-added products (natural leather). Introducing fatty matter into the inter-spaces of tanned leather (stiff and unusable) — fatliquoring, restores the fat removed in tanning and restores flexibility to the leather. This article provides an in-depth understanding of the process. Previous chemical treatment and building of a fatliquor emulsion are the watershed points in the process and the main factor affecting the efficiency of the process is the arriva) of the fatty substance to the collagen fibrils which are thus coated with a thin layer of fats that promote sliding of fibrils and prevent adhesion. Successful fatliquoring is achieved through using an emulsion of specific particle size to enable the oil droplets to penetrate the leather reaching to fibril level. Note de contenu : - Collagen protein structure - Fibril bundles and fatliquor mechanism - Emulsifying of fatty matter and emulsion efficiency - Types of fatliquor emulsion - Modified natural oil and fat used in fatliquoring En ligne : https://drive.google.com/file/d/1D3rKpsxbZyVW-TQFEarRV5giierkoamK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36968 [article]

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Modification of collagen hydrosylate be edac / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 1 (01-02/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 1 (01-02/2008) . - p. 23-29 Titre : Modification of collagen hydrosylate be edac Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Jian Cao, Auteur ; Wang Jintao, Auteur ; Wang Zhongtai, Auteur Année de publication : 2008 Article en page(s) : p. 23-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbodiimides Collagène Emulsification Emulsions -- Stabilité Huiles et graisses -- Absorption Humidité -- Absorption:Eau -- Absorption Hydrolysats de protéines Matériaux -- Modifications chimiques Poids moléculaires Température Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The work in this paper describes the modification of collagen hydrolysate with 1-ethyl-3- (3-dimethyl aminopropyl)-carbodiimide (EDAC). The effects of factors that may affect the cross-linking reactions in the process of modification such as EDAC level, reaction temperature, reaction time, and pH were studied. The optimal modification conditions were obtained to give modified products with the best emulsification and emulsion stability. Changes in molecular weight, emulsification capacity, emulsification stability, water absorption and oil absorption of the collagen hydrolysate before and after modification were studied and compared. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Determination of molecular weight of collagen hydrolysate - Chemical modification - Determination of emulsification capacity and emulsification stability - Determination of water absorption - Determination of oil absorption - Orthogonal experiment - RESULTS AND DISCUSSION : Influence of EDAC level on emulsification capacity, emulsification stability and molecular weight - Influence of pH on emulsification capacity, emulsification stability and molecular weight - Influence of reaction time on emulsification capacity, emulsification stability and molecular weight - Influence of reaction temperature on emulsification capacity, emulsification stability and molecular weight - Orthogonal Tests - Changes of molecular weight and functional properties of collagen hydrolysate before and after modification - Table 1 : Levels of factors in orthogonal tests - Table 2 : Design and results of orthogonal tests - Table 3 : Several functional properties of collagen hydrolysate before and after modification with EDAC En ligne : https://drive.google.com/file/d/1nALamChUCcdYL4y5zofFJjVkmiQw_inM/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38918 [article]

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Preparation of high-solid, low-viscosity waterborne polyurethane: based on multiparticle size composite emulsification / Kunpeng Lou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 3 (05/2024) . - p. 907-923 Titre : Preparation of high-solid, low-viscosity waterborne polyurethane: based on multiparticle size composite emulsification Type de document : texte imprimé Auteurs : Kunpeng Lou, Auteur ; Siliang Li, Auteur ; Yang Cao, Auteur ; Menghang Li, Auteur ; Xiaoxuan Zou, Auteur ; Bo Jing, Auteur Année de publication : 2024 Article en page(s) : p. 907-923 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Emulsification Granulométrie Haut extrait sec Polymères en émulsion Polyuréthanes Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, waterborne polyurethane (WPU-SL) with high solid content and low viscosity was successfully prepared by compounding large particle size emulsion (WPU-L) with a variety of small particle size emulsions (WPU-S) by investigating the effects of small particle size type, particle size ratio, and volume ratio on the emulsion properties. A series of characterization techniques of the waterborne polyurethane was carried out by FTIR, DSC, contact angle, viscometer, particle size meter, and universal testing machine. The results show that the WPU-L/WPU-S = 5/1 emulsion has a high solid content, good emulsion stability, and excellent coating film properties. When WPU-S1 and WPU-S3, two small particle size emulsions with a particle size ratio of 2.45 and 3.79, were emulsified with WPU-L, the solid content was up to 61.23%, the viscosity was only 342 mPa s, the tensile strength reached 20.97 MPa, and the adhesion grade was 5B, which was the most excellent overall performance, showing satisfactory results. Note de contenu : - EXPERIMENTAL : Materials - Preparation of small-particle waterborne polyurethane (WPU-S) - Preparation of large-particle waterborne polyurethane (WPU-L) - Preparation of high-solid content waterborne polyurethane (WPU-SL) - Preparation of WPU films - CHARACTERIZATION - RESULTS AND DISCUSSION : FTIR spectra of WPU - Emulsion properties of small particle size emulsions (WPU-S) and large particle size emulsions (WPU-L) - The particle size of WPU-SL emulsions and their solid content and viscosity - Thermal properties of WPU-SL emulsions - Water absorption of WPU-SL emulsions and their contact angle - Tensile properties of WPU-SL emulsions - Adhesion of WPU-SL emulsions DOI : https://doi.org/10.1007/s11998-023-00859-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00859-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41066 [article]

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Removal of Cr(VI) by emulsion membrane technology / Liu Anjun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 52-58 Titre : Removal of Cr(VI) by emulsion membrane technology Type de document : texte imprimé Auteurs : Liu Anjun, Auteur ; Ding Shaolan, Auteur ; Zhao Chuanchuan, Auteur ; Ren Huijun, Auteur ; Zhao Quanyong, Auteur Année de publication : 2007 Article en page(s) : p. 52-58 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent Cuirs et peaux -- Industrie Déchets industriels -- Elimination Eaux usées -- Epuration Emulsification Extraction (chimie) Membrane liquide en émulsion pH -- Mesure Surfactants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This article describes our study on the removal of Cr(VI) with the emulsion membrane formed from trioctylamine, secondary capryl alcohol and tributyl phosphate as carriers, Span-80 and Lan-113 as surfactants, and kerosene as the membrane solvent. Further, we have performed an orthogonal experiment regarding the carriers, surfactants for individual use and in combination. We also determined the way in which operational conditions, such as Roi, Rew, the internal and external phase pH values, emulsification mixing speed, time and waste/emulsion mixing rate affected the removal rate of Cr(VI). Note de contenu : - EXPERIMENTAL PROCEDURES : Reagents, instruments and equipment - RESULTS AND DISCUSSION : Selection and determination of the emulsion liquid membrane system - Carriers - Extracting mechanism of extractants - Surfactant concentration and types - Liquid volume rate in emulsion liquid (Voil/Vwi) - oil internal ratio Roi - Emulsification stirring speed and time - Extraction stirring/rotating speed - Extraction time - External phase pH values - NaOH concentration of internal water phase - Vw/o/Vwe - - Table 1 : L27(313) orthoganol experimental design - the factors and levels table - Table 2 : L18(37) orthoganol experimental design - the factors and levels table - Table 3 : L25(56) orthoganol experimental design - the factors and levels table En ligne : This article describes our study on the removal of Cr(VI) with the emulsion memb [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39033 [article]

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The effect of particle size on the characteristics and performance of emulsion binders and topcoats / T. J. Braithwaite in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)  

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The effect of particle size on the characteristics and performance of emulsion binders and topcoats / T. J. Braithwaite in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 4 (07-08/1978)  

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