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Applications of X-ray diffraction and fluorescence techniques in coatings industries / G. Bathiri in PAINTINDIA, Vol. LI, N° 9 (09/2001)

[article]  inPAINTINDIA > Vol. LI, N° 9 (09/2001) . - p. 33-40 Titre : Applications of X-ray diffraction and fluorescence techniques in coatings industries Type de document : texte imprimé Auteurs : G. Bathiri, Auteur Année de publication : 2001 Article en page(s) : p. 33-40 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  Peinture  Feuil  'Analyse  chimique'  Pigment  quantitative'  qualitative'  'Détection  défaut'  Cristallinité  surface'  'Diffraction  RX'  'Spectrométrie  fluorescence Index. décimale : 667.9 Revêtements et enduits Résumé : X-ray diffraction spectroscopy (XRD) and X-ray fluorescence spectroscopy (XRF) are very useful techniques in the characterisation of materials. In XRD, the angle of diffraction of X-ray is measured after allowing X-rays to be incident on the material under testing. The distance between layer of atoms (d) then can be calculated using Bragg's equation. Plot of intensity vs d - value gives XRD spectrum. In XRF, X-rays of high wavelength are emitted by the specimen as a result of transition of electrons between orbitals when bombarded by low wavelength X-rays. XRF spectrum is a plot of intensity as a function of either energy or wavelength. XRD & XRF spectra are characteristics of materials and form the basis of their analysis. In coatings XRD is useful in establishing the identity and determining the purity of pigments. The technique is useful for analysis of polymorphic forms in titanium dioxides (rutile and anatase) and copper phthalocyanines (alpha, beta and gamma). XRD has also been used in the determination of identity and amount of pretreatment on metal or in general, crystalline coatings on substrate. XRD also finds use in identifying coating defects. XRF can act as a supporting tool to XRD and can be useful in determination of various elements used in coatings in wider range from ppm to 100%. Both XRD and XRF are useful in coating industry as research, quality control and problem analysis tool. Although these techniques are expensive, their simplicity of operations, speed and ability to give selective information make them a very powerful analytical tool for study of coatings. Note de contenu : - INSTRUMENTATION FOR X-RAY TECHNIQUES - X-RAY DIFFRACTION : Bragg's law - APPLICATIONS OF X-RAY DIFFRACTION ANALYSIS : Identification of pigments - Quantitative analysis of pigment mixtures - Determination of anatase TiO2 content in rutile TiO2 - Study of polymorphism - Use of XRD for tracking coating defect - Characterisation of metal pretreatment and other thin coatings - Crystallinity of polymers - Particle size - Monitoring of chemical reactions. - X-RAY FLUORESCENCE SPECTROSCOPY : Qualitative analysis - Quantitative anlaysis - APPLICATIONS OF X-RAY FLUORESCENCE SPECTROMETRY : Support for X-ray diffraction analysis - Analysis of elements in solution - Quality control - ADVANTAGES AND DISADVANTAGES OF XRF Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12457 [article]

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Cathodic electrodepostion of epoxy resin system / P. Jayakrishnan in PAINTINDIA, Vol. LI, N° 9 (09/2001)

[article]  inPAINTINDIA > Vol. LI, N° 9 (09/2001) . - p. 43-48 Titre : Cathodic electrodepostion of epoxy resin system Type de document : texte imprimé Auteurs : P. Jayakrishnan, Auteur Année de publication : 2001 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Etude  expérimentale'  'Procédé  revêtement'  Peinturage  'Dépôt  électrophorèse'  Cataphorèse  'Peinture  anticorrosion'  eau'  'Solution  aqueuse'  Liant  'Epoxyde  résine'  Préparation Index. décimale : 667.9 Revêtements et enduits Résumé : Electrodeposition of paint has become one of the effective methods of application of coatings. It has several advantages over conventional paint application methods, the most important one being the control of pollution, since water is the main solvent used in the process in place of toxic organic solvents. Both anodic and cathodic processes have been developed, but the latter has clear cut advantages over the former, because, in cathodic process, the substrate dissolution can be avoided, which helps in eliminating the threat of coating discoloration and also the bath instability. Epoxy resins are well known for their corrosion protective properties. In the present work, water soluble epoxy resin is prepared by modifying with amine for getting cathodic systems. The resin, on dissolution in water by adding organic acids, could be cathodically deposited. The studies made with the cathodic epoxy resin with and without pigmentation and also the evaluation of the electrocoating are detailed in this paper. Note de contenu : - Effect of conductivity of the resin solution and deposition characteristics - Effect of resin concentration - Effect of applied voltage - Effect of pH - Characteristics of electrocoating bath - Potentiodynamic electrodeposition studies - Evaluation of the properties of the coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12458 [article]

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A review on UV curable coatings / K. Sudarsan in PAINTINDIA, Vol. LI, N° 9 (09/2001)

[article]  inPAINTINDIA > Vol. LI, N° 9 (09/2001) . - p. 51-60 Titre : A review on UV curable coatings Type de document : texte imprimé Auteurs : K. Sudarsan, Auteur Année de publication : 2001 Article en page(s) : p. 51-60 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  'Peinture  photodurcissable'  Durcissement  'Rayonnement  UV'  'Article  synthèse'  Photoamorceur  Formulation  Liant  Adjuvant  Pigment  'Mécanisme  réaction' Index. décimale : 667.9 Revêtements et enduits Résumé : Most of the paints in usage are solvent based. These solvents are becoming a threat to environmental harmony. Several coatings have been developed to reduce VOC emission. UV curable coating is one such boon to paint industries, which not only reduces the VOC, but also increases the productivity. After decades of continuous development, radiation curing has evolved into a mature technology. Still developments are continuing in this field to upgrade it. This article reviews the basic raw materials, reaction mechanism, source of UV light, application techniques and usage, advantages and disadvantages of UV curable coatings. Note de contenu : - RAW MATERIALS - PREPOLYMERS OR OLIGOMERS - TYPES OF OLIGOMERS - VINYL BASED OLIGOMERS : Acrylic prepolymers - Acrylated epoxies - Urethane acrylates - Formation of difunctional urethane acrylate - Polysester acrylates - Silicone acrylates - Acrylated acrylics - Water reducible prepolymers and emulsions - Advantages of using water based system -Disadvantages of using water based system - NON VINYL BASED OLIGOMERS UNSATURED POLYESTER : Thiol/ene system - Stability of prepolymers - MONOMERS (OR) REACTIVE DILUENTS : - Monofunctional monomers - Multifunctional monomers (MFM) - FACTORS THE FORMULATORS SHOULD TAKE CARE WHILE SELECTING THE MONOMERS : - Diluency - Reactivity - Tensile strenght of the cured film - Surface tension - HLB (Hydrophilic Liphophilic Balance) of monomers - Shrinkage -Volatility and odour - Weatherability - Colour and stability - Difference between monofunctional and multifunctional monomers - Monofunctional monomers - Multifunctional monomers - PIGMENTS/FILLERS - ADDITIVES - PHOTOINITIATORS - REACTION MECHANISM - SOURCES OF UV RADIATION : - Arc light - Reflector designs - Laser lght - APPLICATION TECHNIQUES OF UV COATINGS : - Roll coater - Reverse roll coater - Direct roll coater - Curtain coater - Spray coater - Electrostatic spray - Air assisted spray - APPLICATIONS, ADVANTAGES AND DISADVANTAGES OF UV CURING COATINGS : - Applications - Advantages - Disadvantages - ADVANCES IN UV CURABLE COATINGS ANF FUTURE SCOPE : Powder and future scope - Electron beam curing Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12459 [article]

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Perylene pigments / N. Sekar in PAINTINDIA, Vol. LI, N° 9 (09/2001)

[article]  inPAINTINDIA > Vol. LI, N° 9 (09/2001) . - p. 63-64 Titre : Perylene pigments Type de document : texte imprimé Auteurs : N. Sekar, Auteur Année de publication : 2001 Article en page(s) : p. 63-64 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Recent developments in the synthesis and properties of perylene pigments (excluding hightch functional properties) have been presented. Note de contenu : - SYNTHESIS AND RECENT DEVELOPMENTS - PROPERTIES AND APPLICATIONS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12460 [article]

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Performance enhancement of protective coating systems for I11-prepared surfaces using 1K moistue PU / B. P. Mallik in PAINTINDIA, Vol. LI, N° 9 (09/2001)

[article]  inPAINTINDIA > Vol. LI, N° 9 (09/2001) . - p. 119-123 Titre : Performance enhancement of protective coating systems for I11-prepared surfaces using 1K moistue PU Type de document : texte imprimé Auteurs : B. P. Mallik, Auteur Année de publication : 2001 Article en page(s) : p. 119-123 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  'Peinture  anticorrosion'  'Protection  corrosion'  'Uréthanne  polymère'  Durcissement  Humidité  Peinturage  Préparation Index. décimale : 667.9 Revêtements et enduits Résumé : The life of a protective coating system on ill prepared surfaces can be improved significantly by using a layer of highly penetrating and strongly adherent sealer coat based on 1K Moisture Cure Polyurethane which can bind and encapsulate rust tightly to form a sound base for the application of subsequent coats. The unique potential of 1K Moisture Cure Polyurethane as a rust fixation coat and its ability to enhance the performance of protective coating systems based on Moisture Cure Polyurethane and rust tolerant epoxies on manually cleaned rusty steel surface have been discussed. Note de contenu : - Chemistry of moisture cure polyurethane - Advantages and disadvantages of 1K PU - Application of moisture cure polyurethane - Moisture cure polyurethane as rust fixation coating - Lab experiments - Fields : Details of system - Site I. Chemically polluted, non-coastal - Site II : Chemically polluted coastal environment Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12461 [article]

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A new tailor-made polyisocyanate for two-pack waterborne polyurethane coatings / Raul Pires in PAINTINDIA, Vol. LI, N° 9 (09/2001)

[article]  inPAINTINDIA > Vol. LI, N° 9 (09/2001) . - p. 124-129 Titre : A new tailor-made polyisocyanate for two-pack waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Raul Pires, Auteur ; Hans Josef Laas, Auteur Année de publication : 2001 Article en page(s) : p. 124-129 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  'Peinture  eau'  deux  constituants'  Formulation  Liant  'Uréthanne  polymère'  'Isocyanate  Vernis  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : The increasing importance of environmental considerations and growing legislative pressures have resulted in the past in the development of various concepts for formulating low-emission coatings for automotive applications. Of the various approaches taken waterborne two-component polyurethane (2K-PUR) technology has proven to yield the highest quality at low baking temperatures (T<80°C) and the lowest emissions of volatile organic compounds (VOC). Waterborne 2K-PUR coatings require the development of tailor-made raw materials that satisfy the environmental requirements of the coatings industry and yield coating systems of consistent high quality. Note de contenu : - THE SUCCESS OF 2K-PUR COATINGS - CONCEPTS FOR FORMULATING LOW-EMISSION 2K-PUR COATINGS - POLYISOCYANATES FOR WATERBORNE COATINGS - NEW HYDROPHILICALLY MODIFIED POLYISOCYANATE FOR WATERBORNE COATINGS - TEST CONDITIONS - TECHNICAL TESTING CONDITIONS - PARTICLE SIZE DISTRIBUTION OF HYDROPHILICALLY MODIFIED POLYISOCYANATES WHEN EMULSIFIED IN AQUEOUS DISPERSIONS - TECHNICAL TESTING OF THE CLEARCOATS - TECHNICAL TESTING OF WHITE COATINGS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12472 [article]

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