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Special techniques for synthesis of high solid resins and applications in surface coatings / Suhas Chakrabarti in PAINTINDIA, Vol. LIII, N° 1 (01/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 1 (01/2003) . - p. 33-40 Titre : Special techniques for synthesis of high solid resins and applications in surface coatings Type de document : texte imprimé Auteurs : Suhas Chakrabarti, Auteur ; Somnath Ray, Auteur Année de publication : 2003 Article en page(s) : p. 33-40 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Over the past few decades, high solid resins have gained wide spread acceptance in the surface coating industries, as these are used successfully in high solid coating for improved performances and meeting volatile organic compound (VOC) regulations. In this paper, different techniques of preparation for high solid alkyds, acrylics, polyesters and polyurethanes have been discussed. The role of hydrogen bond acceptor solvents, and reactive diluents in the preparation of alkyd and polyester resins are mentioned here. The effect of molecular weight distribution, polydispersity and functionality of the polyols and polybasic acids have been discussed for these resins. The effect of different synthesis conditions and formulation parameters has been discussed in the preparation ofthermosetting acrylic resins. The use of star oligomers based on trimethylol propane, oligopropylenediol and oxazolidine has been discussed in preparation of polyurethane resins having high non volatile contents. Note de contenu : - Alkyd resins - By changing the amount and type of solvents - Reduction of molecular weight - Controlling molecular weight distribution - Controlling the structure of resins molecules - Using reactive diluents - Acrylic resins - Synthesis conditions - Formulation parameters - Polyester resins - Polyurethane resins - Different methods to get higher solid Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12070 [article]

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Physico-chemical characteristics of CNSL and its potential use / Deepti Shikha in PAINTINDIA, Vol. LIII, N° 1 (01/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 1 (01/2003) . - p. 41-46 Titre : Physico-chemical characteristics of CNSL and its potential use Type de document : texte imprimé Auteurs : Deepti Shikha, Auteur ; Manish Bajpayee, Auteur ; P. K. Kamani, Auteur Année de publication : 2003 Article en page(s) : p. 41-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The realisation that petroleum reserves are finite, thereby casting doubts on the future availability of petroleum products as industrial raw materials, has rekindled interest on renewable resources like Cashew Nut Shell Liquid (CNSL). CNSL, which is obtained from the shells as a by-product of the cashew nut industry, is one of the few major and economic sources of naturally occurring phenols. The presence of considerable amount of phenolic compound in CNSL makes it an important low cost and widely versatile alternative raw material in several applications, notable in the manufacture of paints and varnishes, production of friction dust for formulating brake linings and clutch facing lamination, production of foundry core oil, rubber compounding and for protecting wood etc. This paper covers the extraction, chemical composition, polymerisation, properties and industrial applications of CNSL and its products. Note de contenu : - Extraction - Constituents of CNSL - Natural and technical CNSL - Anacardic acid - Cardol - Cardanol - 2-Methylcardol - Physico-chemical properties of CNSL - Polymerisation of CNSL - Applications and uses of CNSL Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12071 [article]

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New age matting agents / V. Petry in PAINTINDIA, Vol. LIII, N° 1 (01/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 1 (01/2003) . - p. 47-68 Titre : New age matting agents Type de document : texte imprimé Auteurs : V. Petry, Auteur ; T. Fletcher, Auteur ; David J. Kent, Auteur Année de publication : 2003 Article en page(s) : p. 47-68 Note générale : Bibliogr. Langues : Anglais (eng) Résumé : Matting agents are widely used additives to reduce the gloss in a variety of coatings applications. In this article three types of new matting agents are discussed. High pore volume-matting agents for conventional solvent borne lacquers, matting of UV-cured systems and gloss control additives for thermosetting powder coatings. The efficiency of matting agents in conventional solvent borne lacquers depends on factors such as, type of silica, particle size distribution and porosity of particle. Here the influence of high porosity silica gels on matting efficiency and rheology in 2 pack polyurethane, waterborne polyurethane, alkyd, and polyester melamine system, is discussed. Matting efficiency differences and influence on viscosity depends, not only on porosity but also on particle size distribution, organic treatment and on the coatings formulation. Creating matte effects in traditional coatings presents no great technical problems, since adequate film shrinkage results from evaporation of volatile components. It is proposed to discuss the matting of modern coatings, like the emerging market of UV-cured lacquers and thermosetting powder coatings, which undergo minimal or no shrinkage during film formation. The study on UV cured coatings is based on the use of Design of Experiments and 6-Sigma Tools, to investigate the correlation of UV-formulation and lacquer properties, beside the known effects of matting agent on film and lacquer properties. The matting of powder coatings as induced by novel reactive matting agents will be outlined in terms of changes in rheological properties and in terms of changes in surface profile statistics that take place during film formation. Attention to the influence of gloss level on other film properties will be given. Note de contenu : - Conventional solvent borne lacquers - Matting of alkyd lacquers - Thixotropic alkyd lacquers - Polyurethane lacquers - Waterborne PU customer lacquer for leather coating - Polyester coil coatings system - The so-called “high-solids or 100%” systems - Screening design - Detailed investigation of monomer influence - Detailed investigation of oligomer influence on matting - Matting of powder coatings - Matting powder coatings - New matting agents for powder coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12072 [article]

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Blue inorganic pigments / N. Sekar in PAINTINDIA, Vol. LIII, N° 1 (01/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 1 (01/2003) . - p. 69-70 Titre : Blue inorganic pigments Type de document : texte imprimé Auteurs : N. Sekar, Auteur Année de publication : 2003 Article en page(s) : p. 69-70 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The chemistry and properties of blue inorganic pigments - ultramarine blue, iron blue and cobalt blue - are briefly discussed. Note de contenu : - Ultramarine blue - Iron blue - Cobalt blue Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12073 [article]

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Cloud point vs. traditional titration methods to determine solubility / Bob Cook in PAINTINDIA, Vol. LIII, N° 1 (01/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 1 (01/2003) . - p. 71-74 Titre : Cloud point vs. traditional titration methods to determine solubility Type de document : texte imprimé Auteurs : Bob Cook, Auteur Année de publication : 2003 Article en page(s) : p. 71-74 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Method differences - Why cloud points? - Interpreting the results - Vehicle formulation aid - Lower test variation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12074 [article]

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