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Microencapsulation techniques and their potential in self-healing coatings / Sakshi Arora in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 55-66 Titre : Microencapsulation techniques and their potential in self-healing coatings Type de document : texte imprimé Auteurs : Sakshi Arora, Auteur Année de publication : 2020 Article en page(s) : p. 55-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Core-Shell Inhibiteurs (chimie) Revêtement autoréparant Revêtement autoréparant:Peinture autocicatrisante Index. décimale : 667.9 Revêtements et enduits Résumé : Microencapsulation can be described as the process of enclosing micron-sized particles of solids or droplets of liquids or gases in an inert shell in order to isolate and protect them from the external environment. The concept of encapsulation of materials is inspired from micro to macro-scale examples in the nature like a seed or a cell for protection against environmental impacts. This technology can be used for valuable applications requiring controlled and targeted release, masking odors and protection of reactive or sensitive additives used for different applications. The fabrication of microcapsules can been attained by chemical, physico-chemical and physico-mechanical processes depending on the nature of the core and the shell materials, efficiency of encapsulation and the shell thickness required. The microencapsulation has found application in numerous fields like adhesives, carbonless copy paper, phase change materials, perfumes with its growing technical readiness for use in the protective coatings. The microcapsules based on shell made up of thermoset resins containing healing agents of different chemical nature (inhibitors) have been investigated to serve as self-healing coatings. This paper reviews the different techniques used for microencapsulation and their applications with an emphasis on its use for the self-healing coatings. Note de contenu : - SYNTHESIS OF MICROCAPSULESynthesis of microcapsules - CHEMICAL METHODS : Interfacial polymerization - IN-SITU POLYMERIZATION - PHYSICO-CHEMICAL METHODS : Layer-by-layer (LBL) - Rapid expansion of supercritical fluids - PHYSICO-MECHANICAL PROCESSES : Co-extrusion - SPRAY-DRYING : Top spray - Tangential spray - Spinning disk - Microcapsules for the self-healing coatings - Two component system - Single component system - Application microcapsules in the coating - Fig. 1 : Cost and complexity comparison of different encapsulation techniques) - Fig. 2 : Schematic representation of microcapsule - Fig. 3 : Morphology of microcapsules - Fig. 4 : Techniques used for microencapsulation - Fig. 5 : Interfacial polymerization process for microcapsule fabrication - Fig. 6 : In-situ polymerization process for microcapsule formation - Fig. 7 : Urea-formaldehyde capsules containing dicyclopentadiene healing agent - Fig. 8 : Coacervation process for microcapsule formation a. Dispersion of core material in the shell polymer solution b. Separation of polymer rich phase (Coacervate) c. Coating of core material by microdroplets of the coacervate d. Coalescence of coacervate to form continuous shell around the core particles - Fig. 9 : Layer-by-layer methodology - Fig. 10 : SiO, nanocontainers and its incorporation in Zr0,/SiO, coating - Fig. 11 : Microencapsulation by Rapid Expansion of Supercritical Solution (RESS) - Fig. 12 : Microencapsulation by co-extrusion process - Fig. 13 : Microencapsultion by spray-drying process - Fig. 14 : Schematic representation of three types of spraying chamber - Fig. 15 : Microencapsulation by spanning disk action - Fig. 16 : Application of microcapsules in coatings - Table 1 : Particle sizes obtained from differentm icroencapsulation processes - Table 2 : Two-component healing systems - Table 3 : Single component healing systems - Table 4 : Sample matrix as analyzed by Kumar et al En ligne : https://drive.google.com/file/d/1Ewtp9LSvoV6wMDtCuXL9TlueLm9-6T-m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35201 [article]

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Recent developments in structural adhesives / Shubham Kharat in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 67-71 Titre : Recent developments in structural adhesives Type de document : texte imprimé Auteurs : Shubham Kharat, Auteur Année de publication : 2020 Article en page(s) : p. 67-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs structuraux Adhésion réversible Nanoparticules Polyuréthanes Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The function of structural adhesive is to hold surfaces together which can tolerate high loads. The structural adhesives are used for application in which the adherents experience large stress up to their yield point. The structural adhesive bond must be capable of transmitting stress without loss of integrity within design limit. In case of polyurethane structural adhesives, the development in recent time is observed in its raw material selection. Polyurethane is synthesized using polyester polyol and (di) isocyanate. Prominently, polyester polyols which are used in adhesive industry are synthesised using Isophthalic acid (IPA), phthalic anhydride (PAn) and Dimethyl terephthalate (DMT). The adhesive is easy to manufacture, transport and application. Though it lias many advantages, but the adhesive made from IPA, PAn and DMT are costlier than other adhesives available in market. Adding to this, since the density of IPA is high; it contains lesser volume when consumption is considered. To overcome this, purified terephthalic acid (PTA) is introduced as replacement raw material for these acids. It is cheaper and has lesser volume as compared to IPA. Recently, various other new technologies have been introduced in the sector of structural adhesives. Reversible adherence technology has made it easy to repair the industrial devices and easy recycling of the raw materials. Reactive hot melt urethanes, reactive acrylic adhesive, UV curing aerobic acrylics, cyanoacrylates adhesive, smart adhesive joint by thermally expandable particles, etc. are the various recent developments which have been made in structural adhesive field. A new concept of self healing of the adhesive has been introduced in this paper which mainly focuses on the curing of the cracks developed in adhesive joints. Nanoparticles and hollow glass fibres pay an important role self healing of the cracks in adhesive joints. Note de contenu : - INTRODUCTION : Adhesive selection - Following are some of the advantages of PTA over other raw materials - Reversible adherence - Reactive hot melt polyurethane (RHMUs) - Reactive acrylic adhesive - Cyanoacrylates adhesives - UV curing aerobic acrylics - Smart adhesive joints by use of nanoparticles - Nanoparticles in adhesive joints - Self healing materials : concepts and recent development - Hollow glass fibers - Fig. 1 : Cure profile of condensation versus addition polymerization - Fig. 2 : Model of expansion mechanism - Fig. 3 : Schematic representation of nanoparticle movement during crack growth in thermoplastics - Fig. 4 : Micro-capsule based self healing concept - Fig. 5 : Schematic representation of hollow fibers self-healing concept En ligne : https://drive.google.com/file/d/1U34u28WSSLaWf2KVo1iKS0QWEjuZrVam/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35202 [article]

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Waterbased epoxy technologies for metal coating applications / Daniel Suckley in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 78-86 Titre : Waterbased epoxy technologies for metal coating applications Type de document : texte imprimé Auteurs : Daniel Suckley, Auteur Année de publication : 2020 Article en page(s) : p. 78-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Epoxydes Essais de brouillard salin Formulation (Génie chimique) Métaux -- Revêtements protecteurs Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy resins are well known as high performance materials in various construction and metal coating applications, providing the combined properties of chemical resistance, adhesion, corrosion resistance and mechanical strength. They are one of the best materials available when comparing performance against relative cost and this has in turn led to epoxies being the substance of choice for use as flooring materials and for the corrosion protection of metal. They are often supplied as a two component system comprising a resin and a curing agent. Increasing environmental concems worldwide has led industries to experience a graduai shift towards water-based technologies as limits on emissions, VOC content and safety rulings become more prevalent across the world. Epoxy resins by their very nature are fundamentally incompatible with water and careful design of the molecule be it a curing agent or epoxy resin is crucial to deliver the products in aqueous media but when fully cured give the same high performance as conventional epoxy based materials. This careful design often leads to performance that exceeds that of conventional technologies which this paper intends to describe in detail. High molecular weight resins can be supplied at low easy-to-use viscosities giving performance advantages in the coating such as fast drying times and long pot )ives. Curing agents were designed with low amine contents through careful adjustments to their chemical structure giving a perfect balance between water miscibility and full compatibility with epoxy resins. The Combined waterbased resin and hardener system is further formulated in a 2 -pack corrosion protection coating that give high performance even when applied at relatively low dry film thickness, and is comparable to that ach ieved with conventional solvent-based coatings. Note de contenu : - Waterbased epoxy coating development - Performance testing - Fig. 1 : The chemical structure of a bisphenol A diglycidyl ether epoxy resin (BADGE) - Fig. 2 : Reactive sites on a standard epoxy resin - Fig. 3 : Film-forming mechanism of liquid-applied coatings - Fig. 4 : The basic composition of a high performance waterbased epoxy resin - Fig. 5 : Plot showing the viscosity rise profile of a waterbaset type epoxy emulsion (WB epoxy) and a liquid epoxy resin (YD 128) cured with the same curing agent - Fig. 6 : Plot Showing the drying times of A waterbased type 1 epoxy emulsion (WB EPDXY) and a liquid epoxy resin (YD 128) cured with the same curing agent - Fig. 7 : The generic chemical structure of a waterbased curing agent - Fig. 8 : Viscosity profiles and coalescing behaviour of the base system (resin and curing agent) - Fig. 9 : Adhesion properties of the formulated coating throughout it pot life - Fig. 10 : Appearance of coated panels after 2000 hours of salt spray exposure (ASTM B117) - Fig. 11 : Test data and coating appearance after salt water immersion - Fig. 12 : The appearance of a waterbased coated panel and a solvent-based coated panel after 2000 hours salt spray exposure (ASTM B117) - Table 1 : Physical specifications of the waterbased epoxy (Cetepox 484 R) and waterbased curing agent (Epotec THW 4510) - Table 2 : Panel evaluation after salt-spray exposure - Appendix A : Formulation for a 2-packWaterbased corrosion protection coating - Appendix B : A summary of the main coating properties of the formualtion in A - Appendix C : Formulation for a 2-packSolvent based corrosion protection coating En ligne : https://drive.google.com/file/d/1e75Op2FUkYv3N3Fd-eyPy5nBSgkLGw5M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35203 [article]

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Pigment dispersion technology - Part II / Tipanna Melkeri in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 88-96 Titre : Pigment dispersion technology - Part II Type de document : texte imprimé Auteurs : Tipanna Melkeri, Auteur Année de publication : 2020 Article en page(s) : p. 88-96 Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Dispersions et suspensions Pigments Polymères en émulsion Surfactants Index. décimale : 667.2 Colorants et pigments Résumé : To formulate best pigment dispersion solution, one has to consider Dispersant, Grinding medium, Pigments/fillers, Order of addition and Surface area of pigment/filler. The choice of the dispersing agents is a key issue in the coating and ink industry. The role of the dispersing agents is to enhance the dispersion process and ensure a fine particle size in order to stabilize pigments in the resin solution. Dispersant can be Polymeric dispersant or Surfactants. The main differences of those two types of dispersants being the molecular weight, the stabilization mechanism and the resulting let down stability. Polymer dispersant has two parts polymer chain and anchoring group. Polymer chain must be compatible with resin system where as anchoring group should have affinity for pigments used. Anchoring can then take place through a variety of mechanisms. Based on resin system used in grinding the pigment the polymeric dispersant is very important. The choice of dispersant is also related to the surface nature of the pigment specially the anchoring group. The surface area of the pigment also affects the level of dispersant used, and in general, if too little is used then the full benefits will not be realized. Note de contenu : - INTRODUCTION : Dispersant - POLYMERIC DISPERSANTS : Polymeric chain - Anchoring group - ANCHORING MECHANISMS : Anchoring through ionic or acidic/basic groups - Anchoring through hydrogen-bonding groups - Anchoring through polarizing groups - Anchoring through solvent-insoluble polymer blocks - PIGMENT SYNERGIST - II SURFACTANTS : Fatty acid derivatives - Phosphate ester - Sodium polyacrylates/polyacrylic acid - Acetylene diols - Soya lecitin - Fig. 1 : Various possible arrangement of polymer and anchor group - Fig. 2 : Anchoring through acid or basic group - Fig. 3 : Arrangement polar and non polar chain/groups in media - Fig. 4 : Anchoring by hydrogen bonding to a polymeric group - Fig. 5 : Anchoring through polarizing groups - Fig. 6 : Anchoring through solvent insoluble polymer blocks - Fig. 7 : Pigment synergist with anchoring group - Fig. 8 : Type of surfactants - Fig. 9 : Typical structure of ethoxylated acetylene diol - Fig. 10 : Effect of level of dosages of dispersants En ligne : https://drive.google.com/file/d/1I76C2psUf4jbHHKpckvPo_uen7ngtgBC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35204 [article]

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Optimisation of rutile in water based paints / M. Veeramani in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 116-117 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. 116-117 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Applications extérieures Formulation (Génie chimique) Kaolinite Polymères opaques 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 : 667.6 Peintures Résumé : Now let us come to the next raw material which is used as a substitute for Rutile in combination with Rutile and Zeolex, namely Calcined China Clay. In fact CC Clay plays a very important part is the Rutile substitutions. Sonne manufacturers of this product claim the CC Clay atone is sufficient to replace Rutile in the formulation. But considering the cost of such special Calcined China Clay to use it as a sole substitute, it is better to use it combination with other raw materials which will result in good formulation economy without affecting the end results. Note de contenu : - Opaque polymers : Advantages - Guideline formulation - Exterior emulsion paint En ligne : https://drive.google.com/file/d/1rQIorMCwmm5DBOMwwNefWXtV7uqUfyV8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35205 [article]

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PR blue - Case study N° 3 and Gassing - Case study N° 4 / Mukund Hulyalkar in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 118 Titre : PR blue - Case study N° 3 and Gassing - Case study N° 4 Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2020 Article en page(s) : p. 118 Langues : Anglais (eng) Catégories : Bleu de prusse Expertises Gazage Revêtement émail:Peinture-émail Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/1E7g6KC7YdcNm-5U4sKRXyn8K6tFjWY7w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35206 [article]

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Crystalling waterproofing / Harish Agrawal in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 120- 124 Titre : Crystalling waterproofing Type de document : texte imprimé Auteurs : Harish Agrawal, Auteur Année de publication : 2020 Article en page(s) : p. 120- 124 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs Construction -- Matériaux Copolymère vinyle ester Cristaux Epoxydes Formulation (Génie chimique) Imperméabilisation Polyurée Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In building construction, waterproofing is a fundamental aspect of creating a building envelope, which is a control led environment. The roof covering materials, siding, foundations, and all of the various penetrations through these surfaces must be water-resistant and sometimes waterproof. Crystalline waterproofing is a technology that involves the development of crystals to help achieve watertight concrete structures. It protects against sewage and industrial wastes for use in wastewater treatment applications. The main key to the unique properties of crystalline waterproofing is a surface-applied, integral crystalline waterproofing material and is used for waterproofing and chemical protection at both above and below ground level. Note de contenu : - Crystalline waterproofing - Mechanism of crystalline waterproofing : Types of waterproofing - Crystalline waterproofing admixture - Formulation - Characteristic of the crystalline waterproofing admixture - Chemical admixture - Formulation - Characteristics of the chemical admixtures - Conclusion - Crystalline waterproofing coating applied as paint - Formulation for part - 1 (powder) - Formulation for part - 2 (liquid elastomeric emulsion) - Application method : Recommended uses for crystalline waterproofing coatings - Other best chemical waterproofing methods : Grout and epoxy injection -Vinyl ester resin system - Polyurethane liquid - Polyrea coating - Bituminous waterproofing method - Permeability- reducing admixtures (PRAs) En ligne : https://drive.google.com/file/d/1rqIyTrypbIu7b4r1VRHKdWE9jYTo-lgE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35207 [article]

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Test procedures for qualitative and quantitative detection of lead / Mukund Hulyalkar in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 126-129 Titre : Test procedures for qualitative and quantitative detection of lead Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2020 Article en page(s) : p. 126-129 Langues : Anglais (eng) Catégories : Peinture -- Teneur en plomb Revêtements -- Analyse:Peinture -- Analyse Index. décimale : 667.6 Peintures Note de contenu : Repercussions of lead 90ppm - Lead : Detection of lead (qualitative) - Estimate of lead (quantitative) - Moral of the story practically in case of primer 1gm lead is allowed in 100 kg finished product - Identification of lead in pigments - Test for zinc chromate in zinc chrome primer - Table : Analytical techniques : Testing lead in paints En ligne : https://drive.google.com/file/d/1Yoib0HowYkqnryQYE9LvbJbzKEXe1VYP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35208 [article]

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Nitro cellulose - Putty grey / Mukund Hulyalkar in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - 130 Titre : Nitro cellulose - Putty grey Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2020 Article en page(s) : 130 Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Gris (couleur) Mastics Nitrocellulose Index. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/1M-ydZqM4NycTwGi4U9phmozeJfr4zyyC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35209 [article]

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Construction chemicals Q & A forum / Harish Agrawal in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 125 Titre : Construction chemicals Q & A forum Type de document : texte imprimé Auteurs : Harish Agrawal, Auteur Année de publication : 2020 Article en page(s) : p. 125 Langues : Anglais (eng) Catégories : Bois -- Revêtements Cires Efflorescence Expertises Revêtements -- Défauts:Peinture -- Défauts Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/1-Fly3Q0yhsx4-l_uKXUcBL9wCkU3Tbrn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35210 [article]

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