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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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Conductive polymers as anticorrosive additive for marine coatings : a review / Umesh Wagh in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 84-95 Titre : Conductive polymers as anticorrosive additive for marine coatings : a review Type de document : texte imprimé Auteurs : Umesh Wagh, Auteur ; Vivek Krishnan, Auteur ; Ashok Kumar, Auteur Année de publication : 2020 Article en page(s) : p. 84-95 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Conducteurs organiques Corrosion Epoxydes Métaux -- Oxydation anodique Métaux -- Revêtements protecteurs Passivité (Chimie) Polyaniline Polythiophènes Revêtements -- Additifs:Peinture -- Additifs Système de libération contrôlée (technologie) Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Protection of metals and alloys against corrosion by using organic coatings is an area of great interest. Thus, the development of new paints attempts to improve the performance increasing their corrosion resistance and extending the fields of application. Within coating technology, there is increasing interest in the development of efficient anticorrosive additives able to replace the conventional inorganic anticorrosive pigments usually added to paints, which may have detrimental effects on both environment and health. A number of recent studies have evidenced that the modification of a paint formulation by the addition of a low concentration of conducting polymer (0.2-0.3%, w/w) increases sign ificantly the protective properties of the coating. Here we focus on the principles of anticorrosive additives based on conducting polymers for marine paints. The article reviews the most important findings achieved in recent studies. The general aim of this work is to set new standards for research and development in the paint industry by focussing on the addition of a conducting polymerto paint formulation without losing its properties and assuring a good performance. Note de contenu : - Basics of corrosion - Introduction to conductive polymers - Conventional paint system for corrosion protection - Conductive polymers (CP) based anticorrosive paints - Mechanism of corrosion protection using conducting polymers - Anodic protection mechanism - Controlled inhibitor release mechanism - Fig. 1 : Electrochemical corrosion showing rusting of plain carbon steel - Fig. 2 : Chemical structure of polythiophene and polyaniline - Fig. 3 : Outline of the redox-reactions that combines the emeraldine form and the leuco forms of polyaniline and their chemical structures - Fig. 4 : TGA curve of epoxy paint with and without corrosion inhibitors - Fig. 5 : Photographs of the painted rectangular test pieces (scale bar: 1 cm): (a) initial sample, (b) and (c) samples without and with conducting polymer, respectively, optical micrographs from the polymeric films (scale bar: 200_m) and scanning electron micrographs (scale bar: 100 _m) - Fig. 6 : Passivation of steel by conducting PANI-based paint coating - Fig. 7 : Controlled inhibitor release mechanism for a metal, M coated by a CP layer such as PANI doped with an ion, A-which acts as a corrosion inhibitor En ligne : https://drive.google.com/file/d/14IhkCrcgpw7YVYEajqQYxADflGg77zRs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34662 [article]

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The best for red and yellow- A new additive technology for waterborne iron oxide pigment concentrates / Frank Kleinsteinberg in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 96-100 Titre : The best for red and yellow- A new additive technology for waterborne iron oxide pigment concentrates Type de document : texte imprimé Auteurs : Frank Kleinsteinberg, Auteur ; Markus Vogel, Auteur Année de publication : 2020 Article en page(s) : p. 96-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions Formulation (Génie chimique) Granulométrie Jaune Lumière -- Diffusion Opacifiants Oxyde de fer Pigments inorganiques Potentiel zeta Revêtements décoratifs:Peinture décorative Rouge (couleur) Taille des particules Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : In decorative coatings, the use of pigment concentrates is a modern and flexible way to produce colored paints. Especially in waterborne applications, these concentrates have to be suitable for a broad range of different binder technologies. Because of that, the concentrate formulations are usually free of binders and feature a broad compatibility. Furthermore, the demands in terms of storage stability, color strength and cost efficiency are very high. These demands are addressed directly to the used additive technology. The additive has to induce outstanding viscosity reduction to achieve the highest pigment loads and the most economic grinding. It has to stabilize the pigments over a long period of time without any change in viscosity and it has to develop maximum color strength to avoid any waste of expensive pigments. Note de contenu : - Pigment concentrate technology - Pigment dispersion process - Electrostatic stabilization - Zeta potential - Steric stabilization - Discussion of the results - Particle size and hiding power - Viscosity and stability - Zetal potential - Fig. 1 : IHS — Chemical Economics Handbook — Inorganic color pigments consumption of inorganic color pigments in 2014 - Fig. 2 : Relationship :Light scattering - particle size diameter - Fig. 3 : Mechanisms of pigment stabilization - Fig. 4 : Mode of electrostatic stabilization - Fig. 5 : Interaction between pigment particles with and without additive - Fig. 6 :Initial viscosities of the pigment concentrates - Fig. 7 : Zeta potential - Iron oxide yellow zeta potential - PY 42 - Fig. 8 : Zeta potential - iron oxide red zeta potential - PR 101 - Fig. 9 : Stabilization of PY 42 requirements for a good stabilization PY 42 - Fig. 10 : Stabilization of PR 101 - Table 1 : Tested formulations - Table 2 : Particle size and hiding power En ligne : https://drive.google.com/file/d/13OtDZPFJ2wwTzF9XSg8JoyUuUmU733V0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34663 [article]

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Optimisation of rutile in water based paints / M. Veeramani in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 111-112 Titre : Optimisation of rutile in water based paints Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2020 Article en page(s) : p. 111-112 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de titane Réfraction, Indice de Revêtements en phase aqueuse:Peinture en phase aqueuse Rutile Le rutile est une espèce minérale composée de dioxyde de titane de formule TiO2 avec des traces de fer (près de 10 % parfois), tantale, niobium, chrome, vanadium et étain. Il est trimorphe avec la brookite et l'anatase. Il est la forme la plus stable de dioxyde de titane et est produit à haute température, la brookite se formant à des températures plus basses et l'anatase formée à des températures encore plus basses. Index. décimale : 667.9 Revêtements et enduits Résumé : In this issue we wi II see as to how to optimise the Rutile in the paint formulations and also achieve formulation economy, without affecting the properties of the finished coating. Formulators al I over the world are working on this, day in and day out and are trying to reduce Rutile percentage in the formulations and substitute with other extenders to save cost of formulation of various products in order to beat the ever escalating cost of Rutile. This is a golden topic today and every SSI manufacturer is worried on this count as they cannot use imported Rutile and indigenous cost of Rutile is appreciating every month for no rhyme or reason. Hence it is very important to know the properties and functions of Rutile in detail and then look for suitable substitutes which will help reduce rutile in the formulation. Note de contenu : - Rutile and its functions in paint - Scattering by solid particles - Scattering efficiency - Fig. 1 : High refractive index pigment - Fig. 2 : Lower refractive index pigment - Fig. 3: Scattering efficiency of TiO2 particles En ligne : https://drive.google.com/file/d/1Thh3t3MjX37MnwhKDPx2H9-SUJ4zoE2R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34664 [article]

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Nanotechnology in the construction industry (Part - 1) / Harish Agrawal in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 113-119 Titre : Nanotechnology in the construction industry (Part - 1) Type de document : texte imprimé Auteurs : Harish Agrawal, Auteur Année de publication : 2020 Article en page(s) : p. 113-119 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosion Béton renforcé de fibres Cendres de riz et constituants Cendres volantes Construction -- Matériaux Dioxyde de titane Nanoparticules Nanotechnologie Nanotubes Plâtres renforcés de fibres Revêtement auto-nettoyant:Peinture auto-nettoyante Revêtements protecteurs Index. décimale : 620.13 Matériaux de construction : pierre, ciment, béton, liants de Résumé : Nanotechnology in the construction industry ranked eighth out of ten most sign ificant areas of applications. Although nano-products are costly, though the research in nano-technology are limited in the field of construction areas. But it is gaining momentum with the formulation of newer products and profitable return from high value products. Nanotechnology is a very active research area all over the world. The two initial areas of research deals with the understanding of the hydration of cement particles and the use of nano-size silica particles. It believes that if cernent with nano-size particles can be manufactured, it will open up a large number of opportunities in the fields of ceramics, high strength composites and electronic applications. Portland cement could become the high tech material as compared to its current status of conventional construction material. Very few inorganic cementing materials can match the capabiIities of Portland cement in terms of cost. Note de contenu : - What is nanotechnology ? - What is a nanoparticle ? - Importance of nanotechnology - Nanotechnology and concrete - Importance of nano materials : Maincharacteristics of fly ash - Advantages of fly ash - Application of fly ash - Characteristics properties of fly ash - Titanium oxide - Carbon nanotubes (CNT) - Rice husk ash : Manufacture of rice husk ash - Rice husk ash as a supplementary binder - Nano fiber for concrete and plaster reinforcement - So what is nanotechnology ? - Coatings based on nano technology and thin films : For example protective or anti-corrosio coatings - For example self-cleaning coatings En ligne : https://drive.google.com/file/d/10Kz-JHK6soZxy5x4MVB1_PuGFdePL_OY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34665 [article]

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Specific gravity of solvent by hydrometer / Mukund Hulyalkar in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 126-127 Titre : Specific gravity of solvent by hydrometer Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2020 Article en page(s) : p. 126-127 Langues : Anglais (eng) Catégories : Hydrométrie Poids et mesures solvants Unités de mesure -- Tables de conversion Index. décimale : 541.34 Solutions Note de contenu : - Table 1 : Hydrometer conversion table - Table 2 : Sp gravity glass hydrometesr for analytical purpose g/ml - Table 3 : Density hydrometer with ISI mark forpetroleum products g/ml En ligne : https://drive.google.com/file/d/1iSHKSSv_6EXE_F8QxyCq1_PGuYjSJMKZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34666 [article]

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NC thinners and finishes : Formulation / Mukund Hulyalkar in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 128 Titre : NC thinners and finishes : Formulation Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2020 Article en page(s) : p. 128 Langues : Anglais (eng) Catégories : Blanc (couleur) Chrome Colorants Diluants Formulation (Génie chimique) Revêtements -- Coloration:Peinture -- Coloration Vert Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Table 1 : Formulation for direct shades - Table 2 : NC stainers - Table 3 : Base white as a stainer - Middle chrome as a stainer - Lona green as a stainer En ligne : https://drive.google.com/file/d/1S-hoaqo6QuiXxMwv0nLYr7NvvkMhbUg_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34667 [article]

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