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Preparation and characterization of cardanol based novolacs for use in surface coatings / Raju in PAINTINDIA, Vol. LVII, N° 9 (09/2007)
[article]
Titre : Preparation and characterization of cardanol based novolacs for use in surface coatings Type de document : texte imprimé Auteurs : Raju, Auteur ; Ganesh Datt Bajpai, Auteur ; Pramod Kumar, Auteur Année de publication : 2007 Article en page(s) : p. 107-119 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Novolacs Cardanol Characterisation 'Cashew nut shell liquid (CNSL)' Index. décimale : 667.9 Revêtements et enduits Résumé : The novolac resins were prepared by reacting cardanol with formaldehyde. The molar ratios taken with respect to cardanol to formaldehyde were 1:0.6, 1:0.7, 1:0.8 and 1:0.9. These resins were characterized by I.R. spectroscopy for determining respective functional groups in the resin structure, and Gel Permeation Chromatography (GPC) was used to determine the molecular weights of the prepared novolac resins. These resins were found to possess ortho-ortho and ortho-para linkages. The curing characteristics of the resins showed that the resin prepared with molar ratio 1:0.8 has good curing characteristics. Note de contenu : - Experimental : Materials - Analysis of cardanol - Synthesis of cardanol-formaldehyde novolac resins - Coating of panels - Evaluation of physical properties of films - Evaluation of cheminical resistance properties of films
- Results and discussion : Analysis of cardanol - Molecular weight determination of cardanol-formaldehyde resins - I.R. spectral analysis of cardanol-formaldehyde resins - Evaluation of coating films for their curing characteristics - Characterization of cured films of (CNs) for film propertiesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11507
in PAINTINDIA > Vol. LVII, N° 9 (09/2007) . - p. 107-119[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010024 - Périodique Bibliothèque principale Documentaires Disponible Striking a balance / Ganesh Datt Bajpai in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/2008 (07-08/2008)
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Titre : Striking a balance : Effects of changing monomer ratios in copolymers examined Type de document : texte imprimé Auteurs : Ganesh Datt Bajpai, Auteur ; Raju Kumar, Auteur ; Pramod Kumar, Auteur Année de publication : 2008 Article en page(s) : p. 32-35 Note générale : Notes bibliogr. Langues : Anglais (eng) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre.
L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages.
Copolymères -- Synthèse
Méthacrylate de 2-hydroxyéthyle
Polyacryliques
Revêtements organiques
ThermodurcissablesTags : Waterborne acrylics Index. décimale : 667.9 Revêtements et enduits Résumé : Thermosetting acrylic (TSA) copolymers/resins were synthesised by reacting acrylic acid and 2-hydroxyethyl methacrylate monomers in varying molar rations. The prepared resins were made water-soluble by neutralisation, and stoved films were tested for various properties. A 1:1 molar ratio of the monomers appears to provide the most useful. balance of properties. En ligne : https://drive.google.com/file/d/1v6oVxPQsl5naYRgWh5KrKoVuYrdMa-_i/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2383
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/2008 (07-08/2008) . - p. 32-35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010505 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and characterization of water-thinnable thermosetting acrylic resins for low-cure surface coatings / Ganesh Datt Bajpai in PAINTINDIA, Vol. LVII, N° 8 (08/2007)
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Titre : Synthesis and characterization of water-thinnable thermosetting acrylic resins for low-cure surface coatings Type de document : texte imprimé Auteurs : Ganesh Datt Bajpai, Auteur ; Raju Pramod Kumar, Auteur Année de publication : 2007 Article en page(s) : p. 75-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basses températures
Caractérisation
Polyacryliques
Polymères -- Synthèse
Réticulation (polymérisation)
Revêtements:Peinture
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : Among the various binders used for industrial finishes, thermosetting acrylics (TSAs) are gaining importance. There are two main reasons for this; firstly they possess inherently superior properties; such as water clear appearance, colour retention, good durability, low pigment reactivity, excellent chemical resistance and excellent flexibility. Secondly, thermosetting acrylics provide greater formulation latitude as they can be tailor made to suit specific applications. Presently, thermosetting acrylics are commonly used in the two major forms: (a) Solvent soluble thermosetting acrylics for conventional solids coatings. (b) Thermosetting acrylics for high solids coatings. . In the present work, water-thinnable acrylic resins have been developed wherein water is used in place of volatile organic solvent which is the main source of VOC emission. Water-thinnable thermosetting acrylics are getting more prominence day after day because of their eco-friendly nature, cost effectiveness and superior films performance. However, ordinary water-thinnable thermosetting acrylic resins cure at high temperature (≈120-150°C) and hence involve high energy consumption. Through this work, efforts have also been directed towards developing such water-thinnable thermosetting acrylic resins which can be cured at lower temperature to yield low-cure surface coatings. For achieving this, a series of TSA resins were prepared by reacting 2-hydroxy ethyl methacrylate (HEMA) and acrylic acid (AA) as monomers in butanol as solvent in presence of benzoyl peroxide as initiator. The prepared TSA resins were made water soluble by neutralizing with ammonia solution. The coating films-were then baked at 90°C for 30 minutes to effect film cure. Cured films were evaluated for their various optical, mechanical and chemical resistance properties to ascertain the commercial utility of low-temperature curable water-thinnable TSA resins. Note de contenu : Classification of TSA
- Experimental : Materials - Synthesis - Analysis - Preparation of coating films and their curing
- Results & discussion : IR-spectra - Evaluation of film properties - Mechanical propertiesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11500
in PAINTINDIA > Vol. LVII, N° 8 (08/2007) . - p. 75-82[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008391 - Périodique Bibliothèque principale Documentaires Disponible Water-thinnable coatings / Ganesh Datt Bajpai in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4524 (05/2008)
[article]
Titre : Water-thinnable coatings Type de document : texte imprimé Auteurs : Ganesh Datt Bajpai, Auteur ; Raju Kumar, Auteur ; Pramod Kumar, Auteur Année de publication : 2008 Article en page(s) : p. 35-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Automobiles -- Revêtements:Automobiles -- Peinture
Essais (technologie)
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Réticulation (polymérisation)
Revêtements -- Propriétés chimiques:Peinture -- Propriétés chimiques
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : Discussion water-thinnable thermosetting acrylic resins for self-curable automotive coatings. Important film properties can easily be manipulated by the use of acrylics in coating formulations, as they can result in a wide range of film properties due to the availability of a wide variety of monomers. The incorporation of different acrylic-type monomers, having diverse physical and/or chemical properties, in the same polymer molecule in varying proportions, leads to the formation of new materials as acryling copolymers with significant scientific and commercial importance. To obtain optimal film properties, high performance coatings need to undergo crosslinking, for improved film thoughness, solvent resistance and soil pick-up. The crosslinkable or thermosetting acrylics (TSAs) are increasingly used in a variety of surface coating applications. In coating formulations, TSAs are used in two principal forms, viz solventborne TSAs and waterborne TSAs. Nowadays, the use of waterborne TSA systems in surface coatings in gowing and expanding rapidly, due to stringent governmental regulations on environmental protection and energy conservation. In this study, a series of TSA resins were prepared by reacting 2-hydroxy ethylmethacrylate (HEMA) and acrylic acid (AA) as monomers in varying molar ratios in butanol (solvent)in presence of benzoyl peroxyde (initiator) at 60°C. The prepared TSA resins were made water-soluble by neutralising them with ammonia. The applied coating films were baked at 90°C for 30min for curing. Various optical, mechanical and chemical resistance properties of cured films were evaluated. Thermal curing and thermal degradation behaviour of water-thinniable TSA resins were also studied by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) respectively. Note de contenu : - EXPERIMENTAL : Matérials - Instrumental analysis - Preparation of cured films
- RESULTS AND DISCUSSION : Molecular structure - H NMR-spectra - Thermal behaviour - Evaluation of film propertiesEn ligne : https://drive.google.com/file/d/1YlLoyAF1ExIdq1AONZUfYQ5EketmJKXy/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27209
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 198, N° 4524 (05/2008) . - p. 35-37[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010229 - Périodique Bibliothèque principale Documentaires Disponible