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Novel hyperbranched polyaspartic ester-soybean oil hybrid polyurethane-urea coating for high performance and anticorrosive application / Kumar Rajnish in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 55-62 Titre : Novel hyperbranched polyaspartic ester-soybean oil hybrid polyurethane-urea coating for high performance and anticorrosive application Type de document : texte imprimé Auteurs : Kumar Rajnish, Auteur ; Ramanuj Narayan, Auteur Année de publication : 2017 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Brillance (optique) Copolymère uréthane-urée Esters polyaspartiques Huile de soja Hydroxylation Polymères ramifiés Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : Hyperbranched polymers (HBP) are the best choice for high solid and excellent performance polyurethane (PU) coatings and structural materials. Polyaspartic ester polyol based PU-ureas, which are highly unexplored, give good gloss, improved (higher) reaction time, high film build up in a single coat, better leveling and adhesion to a number of substrates with wide application area. We have synthesized a hyperbranched polyaspartic-ester polyol (HPASP) with high atom economy and solvent-free condition via A, + B,B' polycondensation in 'one pot' but two steps. The polyol was reacted with H12MD1 to form one pack high solid moisture-cured PU-urea coatings. The coating exhibited excellent mechanical, thermal, gloss and anticorrosive properties. Keeping the broader application as well as industrial viability in mind, we modified the PU coating to improve flexibility and reduce cost without compromising with the properties. For this, hydroxylated soybean oil (SO) was added to HPASP in various ratios to make PU-ureas based on H12MDI. The PU-ureas based on polyaspartic ester polyol and their SO hybrids showed better reaction control than similar HBP-polyurethanes. The hybrid polyaspartic PU-urea coating films have shown good thermal stability with high gloss transition temperature (Tg). The gloss of all the hybrid coating films was high and the mechanical properties were excellent, some even better than HPASP based PU-urea films. The anticorrosion property of all the coatings was studied using electrochemical technique (Tafel plot) and Pound to be very good. Note de contenu : - EXPERIMENTAL : Characterization techniques - Synthesis of polyaspartic ester polyol and corresponding polyurethane-urea films - - RESULTS AND DISCUSSION : Thermal properties - Thermo-mechanical properties - Abrasion and gloss properties - Anticorrosion properties - SCHEMES : 1. Aspartic acid and polyaspartic-ester respectively - 2. HPASP synthesis - 3. Polyaspartic PU-urea formation - FIGURES : 1a. TGA thermograms of various aspartic PU-urea films - 1b DTA thermograms of various aspartic PU-urea films - 2a and b. Storage modulus Vs temp and tan ? Vs temp respectively - 3. Electrochemical corrosion data (Tafel) of polyaspartic PU and SO hybrid coated mild steel - TABLES : 1. TGA and DMTA results of polyaspartic PU-urea films - 2. Tensile, abrasion and gloss values of polyaspartic PU and SO hybrids - 3. Electrochemical corrosion data of polyaspartic PU and SO hybrid coated mild steel En ligne : https://drive.google.com/file/d/1i3Z-Gl6Dc-GifR-071JAZD708I7aaWI4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28871 [article]

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Effect pigments-pearlescent pigments (Part 2) / Yash Melkeri in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 64-68 Titre : Effect pigments-pearlescent pigments (Part 2) Type de document : texte imprimé Auteurs : Yash Melkeri, Auteur ; Tipanna Melkeri, Auteur Année de publication : 2017 Article en page(s) : p. 64-68 Langues : Anglais (eng) Catégories : Mica Nacre La nacre est le revêtement intérieur de certaines coquilles de mollusque, composé de cristaux d'aragonite et de conchyoline, aux reflets irisés. C'est un produit recherché depuis longtemps pour la décoration, la marqueterie, la confection de bijoux ou de boutons, au point que certains coquillages tels que les ormeaux ont localement disparu. Certains sont élevés pour la nacre. La nacre résiste mieux aux acides que la coquille et se reconstitue lorsqu'elle est percée ou abîmée chez le coquillage vivant. Lorsqu'un élément étranger irritant entre dans la coquille de ces mollusques, ceux-ci secrètent également de la nacre couche après couche tout autour afin de s'en protéger, formant ainsi une ou plusieurs perles. Contrairement aux autres couches de la coquille, la nacre est synthétisée par le mollusque tout au long de sa vie. La nacre fait partie des matières organique selon la HBJO. Pigments à effets spéciaux Procédés de fabrication Index. décimale : 667.2 Colorants et pigments Résumé : Pearlescent pigment, a type of effect pigment, obtained by coating metal oxide on laminar flat surfaces such as natural mica. For pearlescent pigment, muscovite grade mica is preferred. Pearlescent pigment manufacturing is a challenging job as there are many stages invo ved in manufacturing pearlescent pigments. Making pearlescent pigment is not pure chemistry oriented process rather it is physiochemical process. Depending upon the particle size and its distribution of mica powder isolated, different grades of pearlescent pigments are manufactured. Various metal oxides are used to coat mica to get various coloured pearlescent pigments. Incineration of coated mica powder is necessary to obtained good luster pigment. Note de contenu : - CHALLENGES IN MANUFACTURING PEARLESCENT PIGMENTS - MANUFACTURING PROCESS FOR MAKING PEARLESCENT PIGMENT : Manufacturing of process mica - Grinding of mica - Sizing of particles - Treatment of grounded and size separated mica - Treatment of metal oxide on mica - Filtration on metal oxide treated pigment - Drying - Blending and packing - Application in paints - FIGURES : 1a. Wet ground mica roller mill - 1b. Wet ground mica with ball mill - 1c. dry gounded mica with jet mill - 2. Sulphate process to prepare TiO2 - 3. Formation of iron oxide from iron sulphate of ferric chloride - 4. Schematic diagram representing metal oxide coating on mica powder - 6. Conversion of oxide to hydroxide during incineration En ligne : https://drive.google.com/file/d/1haF98WckW8WCDLPogGPLDwsRDduZJnpn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28872 [article]

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High performance polyurethane coatings for wall / Kumar Iyer in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 70-74 Titre : High performance polyurethane coatings for wall Type de document : texte imprimé Auteurs : Kumar Iyer, Auteur Année de publication : 2017 Article en page(s) : p. 70-74 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polyuréthanes Revêtement mural:Peinture murale Revêtements bi-composant:Peinture bi-composant Revêtements en bâtiment:Peinture en bâtiment Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The architectural coatings industry has a key role to play in the sustainable evolution of smart cities in India. These coatings help to facilitate a durable structure. For example they help in achieving higher performance with lower life cycle cost, while fulfilling consumers need. Choosing the right paint is not as simple as selecting the desired color. Indian architectural coatings market is still at a nascent stage as usage levels are much lower compared to other peer markets due to limited awareness about the products and their benefits as well as price conscious customers. However, the industry has witnessed significant growth in the last 5 years with new and complex molecules enhancing properties such as strength, increased resistance to abrasion & weather etc. Going forward, the focus will be on price to performance ratio and not price atone. Wall coatings is one of the predominant areas in construction which not only enhances the aesthetic value of projects but also offers multiple properties such as anti-dust, easy to clean, anti-graffiti, water repellency, long life etc. There has been a steady rise in home values and new home construction. inventing Master Pieces For You" is the key position of Covestroto deliver high performance polyurethane based raw material to provide properties such as high dirt pick up resistance, crack bridgingability, UV resistance, microbial resistance & water proofing. Note de contenu : - PERFORMANCE OF 2K WATERBORNE POLYURETHANE COATINGS : Tough but flexible - Easy to clean - Dirt pick-up resistance - Fungus/algae resistance - TABLES : 1. Chemical & stain resistance data for 2K PU wall coating - 2. Type of fungicide - 3. Comparison of 2K WB PU wall coatings vs. 1k acrylic emulsion - 3. Test items for 2K PU coating and 1K acrylic emulsion En ligne : https://drive.google.com/file/d/1sO1JLkX-Lr0du3bYMee1fyVZTv8hO2Eo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28873 [article]

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TiO2 efficiency in coatings : products and techniques for opacity optimisation in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 76-88 Titre : TiO2 efficiency in coatings : products and techniques for opacity optimisation Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 76-88 Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Dioxyde de titane Dispersions et suspensions Opacité (optique) pH Revêtement en phase solvant:Peinture en phase solvant Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.2 Colorants et pigments Résumé : For those who have been in the Coatings industry for long enough, the rollercoaster ride of TiO2 price comes as no surprise. That said, the days of an even 10-year cycle in price have changed to shorter periods of high price (often painfully high) followed by longer periods of relatively low price (painful for the suppliers). Even when relatively "cheap", TiO, continues to be one of the most expensive raw materials in a coating and so ensuring that the pigment you buy is used correctly and efficiently remains a crucial business objective. Note de contenu : - TiO2 selection - Pigment dispersion - Solvent systems - Water-based systems - The role of pH and surface charge - Dispersants and dispersant requirements - Physical dispersion - Pigment crowding and spacing - Cost effective opacity - Engineered composite technology - FP-pigment "opacity pigment" En ligne : https://drive.google.com/file/d/1jj19-Tjh-qx8uoIt1WgLXgMjEY7PLaor/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28874 [article]

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Paint manufacturing machines / M. Veeramani in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 96-102 Titre : Paint manufacturing machines Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2017 Article en page(s) : p. 96-102 Langues : Anglais (eng) Catégories : Revêtements -- Appareils et matériels:Peinture -- Appareils et matériels Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.6 Peintures Résumé : The next important machine that is used for the manufacture of Emulsion Paints is High Speed Disperser.The High Speed Disperser, also previously called High Speed Dissolver, is a standard workhorse used in the manufacture of chemicals, plastics, coatings, inks, paints, adhesives, composites and many other products. An economical and relatively simple piece of mixing equipment, its primary purpose is to incorporate powders into liquid and break down particle agglomerates to produce a fine dispersion.Running at tip speeds up to around 5,000 ft/nnin, the open disc blade of the High Speed Disperser creates vigorous turbulent flow within a low viscosity batch. It also generates a characteristic vortex into which dry ingredients can be added for quick wet-out. The disperser blade may be located on- or off-centre depending on the depth of the vortex (an off-centre blade produces a smaller vortex and reduces air entrapment). As the batch thickens or increases in volume, blade speed is adjusted to maintain the vortex and rate of material turnover. A few other basic guidelines are typically followed in the sizing and operation of the High Speed Disperser, including : • Normal operating viscosity range: Water-like to around 50,000 centipoise (Cps) n Motor specification: 1 HP for every 100 Litres of product (Suggestive, depending on the v iscos ity, this wi II vary) • Disperser blade diameter: Approximately 1/3 of vessel diameter • Disperser blade location: 0.5 blade d ianneter off the ves se I bottom — 1.5 blade diameter below the batch surfaces. • Full holding capacity of mix vessel: About 130% of batch size to provide sufficient freeboard above the product level. Note de contenu : - How does it work ? - What are the differences between a disperser and agitator ? - What are the different types of disperses that are available - How to select the proper size disperser ? - How to select a proper size tank for a disperser ? - How to select a proper size blade for a disperser ? - How to know when it is time to replace the disperser blade ? - What type of blade is best for the disperser ? - What other factors that affect the performance of disperser ? - How to operate the disperser or optimum performance ? - What safest measures should be followed and why ? En ligne : https://drive.google.com/file/d/1hNX1opTH012pQCxuqTlxW-DFoeqBJC1l/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28875 [article]

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Oils and solvents / Mukund Hulyalkar in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 106 Titre : Oils and solvents : Specific gravity and gallonage per hundredweight and ton Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2017 Article en page(s) : p. 106 Langues : Anglais (eng) Catégories : Huiles et graisses Poids et mesures solvants Index. décimale : 660 Technologie chimique (chimie industrielle) et techniques connexes En ligne : https://drive.google.com/file/d/14T_YxEfJsBdtslZtA55NZd8vlBGE8sq1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28876 [article]

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Stoving enamel - 10 / Mukund Hulyalkar in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 110 Titre : Stoving enamel - 10 : Barrel enamel castor green/white Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2017 Article en page(s) : p. 110 Langues : Anglais (eng) Catégories : Blanc (couleur) Revêtement émail:Peinture-émail Vert Index. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/1qLQO_Br-eRU1v1__mU8aFtkGFAAY30F9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28877 [article]

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Corrosion due to microorganisms / Vinay Kumar Pataskar in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 5 (05/2017) . - p. 116-121 Titre : Corrosion due to microorganisms Type de document : texte imprimé Auteurs : Vinay Kumar Pataskar, Auteur ; Durgesh Kumar Soni, Auteur Année de publication : 2017 Article en page(s) : p. 116-121 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biodégradation Corrosion microbienne Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : Corrosion due to microorganisms is also known as biocorrosion or Microbiologically Influenced Corrosion (MIC). There are several types of microorganisms present in environnent that cannot be seen individuatly with the unaided human eye like bacteria, archaea, fungi etc., which are responsible for corrosion of metals via electrochemical mechanism and deterioration of non-metallic materials. The biocorrosion takes place due to the fixation of bacteria, release of metabolites and formation of biofilms that induce or accelerate the corrosion process. This type of corrosion takes the most severe form in soils, saline environment and humid environment. It is estimated that about 20% of all damages caused by corrosion are influenced by microorganisms ; hence it is very important to understand the basic mechanism of microbial corrosion in order to minimize the fosses and accidents due to corrosion in various industries. This review describes the types of microorganisms which are responsible for bio corrosion and the mechanism behind this corrosion. Note de contenu : - INTRODUCTION : The influence of microorganisms on corrosion process - THE ROLE OF BIOFILMS : Stages of biofilm formation - PRINCIPLES OF MICROBIAL LIFE - TYPES OF MICROORGANISMS INVOLVED IN MIC : Prokayotes - Eukaryota - CORROSION BACTERIA : Acid producing bacteria - Metal reducing bacteria - Metal depositing bacteria - Iron oxidizing bacteria - Sulfur oxidizing bacteria - CAUSATIVE ORGANISMS AND POSSIBLE MECHANISMS : Ennoblement - Concentration cell - Alteration of anion ratios - Reactions within biofilms - MICROBIAL DEGRADATION OF POLYMERS - FIGURES : 1. A typical figure of microbial corrosion on iron surface - 2. Microbiological process and electrochemical corrosion - 3. Stages of biofilm formation - 4. Biocorrosion process promoted by some types of corrosive bacteria - 5. Action of SRB - 6. reactions due to SRB - 7. Biological sulfur cycle in nature - 8. Formation of concentration cells - 9. Pitting corrosion due to microbes - TABLES : 1. Prerequisites for the growth of microorganisms - 2. Examples for electron acceptors - 3. Conditions under which microbial life is observed - 4. Bacteria associated with biocorrosion and their respective local of isolation and damaging actions - 5. MIC in industrial environments En ligne : https://drive.google.com/file/d/1oFCyH0uw1ESlpljxqlkZWjxeqibKa7J7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28878 [article]

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