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PAINTINDIA . Vol. LXIX, N° 1Mention de date : 01/2019Paru le : 15/01/2019 |
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Ajouter le résultat dans votre panierSynthesis of cardanol based epoxy resin for high solids UV curable coatings using bio based reactive diluent : review / Rupanshu Rastogi in PAINTINDIA, Vol. LXIX, N° 1 (01/2019)
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Titre : Synthesis of cardanol based epoxy resin for high solids UV curable coatings using bio based reactive diluent : review Type de document : texte imprimé Auteurs : Rupanshu Rastogi, Auteur ; Risbabh Dwivedi, Auteur Année de publication : 2019 Article en page(s) : p. 55-63 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cardanol
Diluants
Epoxydes
Haut extrait sec
Polymères -- Synthèse
Revêtements -- Additifs
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : With the increase in demand for petrochemical resources resulting in continuous depletion and increased price it's a great challenge for coating industry to look down palliatives based on renewable and sustainable materials which are ecofriendly and non-hazardous. The paper describes some important routes of developing liquid epoxy resin from Cardanol which can be made UV curable by converting into acrylates using bio based reactive diluent based on ricinolic acid(castor oil). Hence the developed product is solvent free and used for high solids coating minimizing the environmental pollution. This dark brown-colored viscous liquid obtained from shel Is of the cashew nut can be utilized fora number of polymerization reactions due to its reactive phenolic structure and a meta-substituted unsaturated al iphatic chain. The product can be implemented in primer coats of metal and wood replacing the conventional Bisphenol-A based epoxy system. The negative impact of BPA on human health and the environnent necessarily implies the el imination of BPA especially in food contact materials. Therefore there is an increasing interest within the chemical industry for non-harmful aromatic substituents to BPA, especially for the synthesis of epoxy polymers. Thus, cardanol could be an interesting substitute to BPA in some polymers such as epoxy polymers. Note de contenu : - Routes of cardanol epoxy synthesis
- UV curing
- Synthesis of cardanol epoxy acrylate (oligomer resin)
- Reactive diluent from ricinoleic acid
- Fig. 1 : CNSL origin
- Fig. 2 : Physical characteristics of CNSL
- Fig. 3 : Chemical composition of CNSL
- Fig. 4 : Chemical structure of cardanol
- Fig. 5 : Scheme for malenisation of cardanol
- Fig. 6 : Scheme for epoxidation of malenised cardanol
- Fig. 7 : Chemical structure of cardanol novolac resin
- Fig. 8 : Scheme for preparation of cardanol novolac epoxy
- Fig. 9 : Reaction scheme of cardanol and polycardanol solid line : reaction route A ; dotted line : reaction route B
- Fig. 10 : Synthesis of polyols form cardanol
- Fig. 11 : Coating process and schematic principle of UV curing
- Fig. 12 : Schematic representation of the chemical processes occurring in EB and UV curing (radical mechanism). B : backbone of the resin molecule or the reactive diluent ; PI : photo-initiator ; R. : radicals initiating the propagation reaction
- Fig. 13 : Reaction of cardanol epoxy novalac with acrylic acid to bring unsaturation in the molecule
- Fig. 14 : Trifunctional cardanol epoxy acrylate oligomer prepared by reaction of the product obtained from Fig. 6 with acrylic acid
- Fig. 15 : Reaction of epoxidied cardanol from Fig. 8 with acrylic acid
- Fig. 16 : Examples of "alpha-cleavage type" and non-cleavable "electron transfer-hydrogen abstraction type"
- Fig. 17 : Synthesis of biobased reactive diluentEn ligne : https://drive.google.com/file/d/1u05gduYzEnUrj_jxK3USXMPGtu5A3AyX/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31939
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Code-barres Cote Support Localisation Section Disponibilité 20675 - Périodique Bibliothèque principale Documentaires Disponible Bio mimicking of lotus effect by 3D printing / K. K. Sengupta in PAINTINDIA, Vol. LXIX, N° 1 (01/2019)
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Titre : Bio mimicking of lotus effect by 3D printing Type de document : texte imprimé Auteurs : K. K. Sengupta, Auteur Année de publication : 2019 Article en page(s) : p. 64-68 Langues : Anglais (eng) Catégories : Colloides
Effet lotusL'effet lotus est un phénomène de superhydrophobie causé par une rugosité nanométrique.L'effet lotus confère à la surface des capacités autonettoyantes : en s'écoulant, les gouttes d'eau emportent avec elles les poussières et particules. La faculté d’autonettoyage des surfaces hydrophobes à structure microscopique et nanoscopique a été découverte dans les années 1970 et son application aux produits biomimétiques remonte au milieu des années 1990.
En raison de leur haute tension superficielle, les gouttes d’eau ont tendance à rétrécir leur surface et par conséquent à atteindre une forme sphérique. Au contact d’une surface, les forces d’adhérence des gouttes à la surface sont telles, qu'elles conduisent à l’humectage de celle-ci. En fonction de la texture de la surface et selon la tension superficielle des gouttes du liquide, on peut trouver un humectage complet comme un humectage partiel.
Différence entre une surface de verre normale et une surface de verre hydrophobe
L’origine de l’autonettoyage réside dans une double structure hydrophobe de la surface. Grâce à celle-ci, la surface de contact, et avec elle la force d’adhérence entre surface et eau ou particules de saleté, est si réduite que cela aboutit à un autonettoyage. La double structure est formée d'un épiderme. La couche extérieure s'appelle la cuticule où il y a une couche de cire. L'épiderme de la feuille forme des papilles de quelques microns sur lesquelles reposent les cires. Cette couche de cire est hydrophobe et forme la deuxième partie de la double structure.
De cette façon l’eau ne peut plus parvenir jusque dans les interstices de la surface de la feuille, ce qui a pour conséquence que les points de contact entre eau et surface sont diminués de façon drastique.
Hydrophobie
Impression tridimensionnelle
Matériaux intelligents
Photoréticulation
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : It has long been known that Lotus Leaves are super-hydrophobic.
But the mechanism of super-hydrophobicity wasn't understood until the 1970s before the introduction of scanning electron microscopes. In case of lotus leaf which has nano rod-like protrusions, so tiny that they reduce its surface adhesion and encourage liquids to ball up and roll off. The underlying principle has been trademarked as the Lotus-Effect.
The self-cleaning property of ultra-hydrophobic micro-nano-structured surfaces was studied by Barthlott and Ehler in 1977, who described such self-cleaning and ultra-hydrophobic properties for the first time as the "lotus effect".
In-depth understanding of super-hydrophobicity requires the examination of the relationship between the surface energy and the surface roughness and the wet-ability of the surface. The most basic equation is the Young's equation. Derivation of the Young's equation starts with the consideration of the sessile drop on an ideal, rigid homogeneous, flat and inert surface. When a liquid is dropped on a sol id substrate there exists a three phase contact line where the air, liquid and solid connects each other.Note de contenu : - COLLOIDAL ASSEMBLIES
- OTHER METHODS
- LIMITATIONS OF SUPER-HYDROPHOBIC SURFACES AND COATINGS : Cost issues - Nanostructure stability - Processing issues - Condensation issues - Impingement issues - Surfactant/oil wetting issues - Other issues - Types of 3D printing technologies and processes
- VAT PHOTOPOLYMERIZATION : Stereolithography (SLA) - Digital light processing (DLP) - Continuous liquid interface productoin (CLIP) - Material jetting - Binder jetting - Fused deposition modelling (FDM) - Fused filament fabrication (FFF) - Contour crafting - Selective laser sintering (SLS) - Direct metal laser sintering (DMLS) - Sheet lamination - Direct energy deposition - Materials
- 3D PRINTING AND INTELLIGENT COATINGS : ExperimentalEn ligne : https://drive.google.com/file/d/15AbXyA2Dk2ovglun_MKGeYd2qHhLob4W/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31940
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Code-barres Cote Support Localisation Section Disponibilité 20675 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Coloring wood veneer Type de document : texte imprimé Auteurs : Ashok Athalye, Auteur ; Arindam Chakraborty, Auteur Année de publication : 2019 Article en page(s) : p. 70-74 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Teinture
Couleur
Placage (ébenisterie)
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : Fashion is ever changing and evolving along with the techno-economic and cultural growth of the human race. lt is not limited only to the personal garb, accessory wear, jewelry, make-up or hair-style but also encompasses the surrounding ambiance and the living conditions. In this regard, the fashion trend in furniture used for home décor, hotel and workplace area is rapidly growing.
Wood is the most common and popular material used in decorative furniture. However, with the indiscriminate destruction of trees and depleting forests, availability of a specific quality of wood required for durable furniture making is declining and becoming quite expensive. Therefore, instead of using sol id wood from the stem or bark of a tree, only a thin layer of wood is cut and then pasted on the exterior part of other suitable material to impart a natural and fashionably vintage look to the furniture.Note de contenu : - Wood veneer
- Classifications of veneers : Usage of veneer
- Coloration of veneer : Pre-treatment - Dyeing
- Development of popular shades
- Fig. 1 : Popular wood species
- Fig. 2 : Construction of polywood
- Fig. 3 : Manufacturing process
- Fig. 4 : TULAVAN VC dyeing
- Fig. 5 : Coloration of veneerEn ligne : https://drive.google.com/file/d/17txB2pZQ10K0Y0B7CjjXo3w1z--rOqV3/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31941
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Code-barres Cote Support Localisation Section Disponibilité 20675 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Paint bases Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2019 Article en page(s) : p. 84-86 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Now let me take the readers to a different topic in Water Based Paints known as BASES. For quite some time tinted/coloured water based paints were made as direct shades, mean the shade itself is made in the production line, whereby it is packed and kept in various shades and packings depending on market requirements. This always used to Iead accumulation of shades in unwanted packing which normally do not move in the market. Like this stocks do pile up with the Dealers and also at manufacturers godown. This leads to disposal of such unwanted stocks, sometimes at throwaway prices. lnstead of incurring reverse transport expenses manufacturers tend to make it as distress sale by selling good quality materials at throw away prices. Ultimately every year the loss on sale of paint in unwanted packing and shades keep increasing, adding loss to the manufacturers.
In order to minimise such losses, cut down inventory and improve upon the tinting strength White Bases without colour were introduced in Indian Paint market in late 80's. Bases are meant to be post tinted, ie: after manufacturing the bases are tinted mostly at the Dealers' premises using a tinting machine. It is impossible for paint shops/manufacturers to stock every colour of paint. However, a paint store can mix any paint colour fora customer while he waits, thanks to paint bases. An endless spectrum of paint colours are created by mixing specific quantities of one or more Colourants with a tintable paint base. A tintable paint base is used to form the foundation for a particular colour. Assorted paint bases typically offered by paint manufacturers include : white, pastel, light, medium, deep and clear. Clear bases are used to create darker colours, while white bases make the lightest colours. Paints are generally available as white, tint and deep and accent bases that can be tinted to various shades and depths by the use of liquid colorants. The level of opaque pigment (in most cases titanium dioxide) is varied to balance the value (degree of darkness or Iightness) of the colour.En ligne : https://drive.google.com/file/d/1geHM2wCsvGJQoUl_r6ko5ZwArmwmep_l/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31942
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Code-barres Cote Support Localisation Section Disponibilité 20675 - Périodique Bibliothèque principale Documentaires Disponible Relative HLB values of the pigment surfaces / Mukund Hulyalkar in PAINTINDIA, Vol. LXIX, N° 1 (01/2019)
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Titre : Relative HLB values of the pigment surfaces Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2019 Article en page(s) : p. 88 Langues : Anglais (eng) Catégories : Chimie des surfaces
Equilibre hydrophile-lipophile
Pigments
SurfactantsIndex. décimale : 667.2 Colorants et pigments Résumé : Pigment surface exhibits certain surface tension. Surface active agent with corresponding surface tension will form low contact angle with the pigment surface or wet the pigment surface properly. HLB of the pigment surface is this corresponding HLB of the surface-active agent. This explains why pigments gets wet easily in the surfactant of equivalent HLB.
In order to achieve maximum wetting it is therefore necessary that the HLB of the surrounding medium or resin should match to the HLB of the pigment surface.Note de contenu : - Figure : HLB values of some important pigment types En ligne : https://drive.google.com/file/d/1sRGTXwKZhaxQb99szZVNmBe-AgiZsDli/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31950
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Code-barres Cote Support Localisation Section Disponibilité 20675 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Synthetic enamels - V Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2019 Article en page(s) : p. 90-92 Langues : Anglais (eng) Catégories :
Revêtement émail:Peinture-émailIndex. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/15wRUUxLvb1fCtoSO9n0LOrzocrHyc2B7/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31951
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Code-barres Cote Support Localisation Section Disponibilité 20675 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Printing ink versus paint Type de document : texte imprimé Année de publication : 2019 Langues : Anglais (eng) Catégories : Encre d'imprimerie
Etudes comparatives
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Coating application has two wings, one is paint others is ink
Sometimes we get confused, between paint and printing inks. Both are coatings, but application wise, they have differences. Paint is known as the coating for decorative and protective purpose. Printing ink is also coating but in graphic-way, where decoration is more important as substrate,takes care of protection. Very simply, both are the selection of raw-materials, depending on the purpose. Subjects are application and selection. There are so many common raw-materials used in inks and paints.Note de contenu : - General-properties - Naturally and physically
- Oxidation-drying
- Evaporation-drying (solvent -release- way)
- Radiation-cure-drying
- Coloration-pigmentation
- Binder-vehicle
- AdditivesEn ligne : https://drive.google.com/file/d/1KCew1A8j2NvkzzDXkXS5JjK1w0JM_v2l/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31952
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