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Acrylate grafted dehydrated castor oil alkyd : A binder for exterior paints / Subhasri Majumdar in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 879 (04/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 879 (04/1998) . - p. 27-33 Titre : Acrylate grafted dehydrated castor oil alkyd : A binder for exterior paints Type de document : texte imprimé Auteurs : Subhasri Majumdar, Auteur ; Dhirendra Kumar, Auteur ; Y. P. S. Nirvan, Auteur Année de publication : 1998 Article en page(s) : p. 27-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Bateaux -- Revêtements:Bateaux -- Peinture Copolymères greffés Huile de ricin et constituants Huiles et graisses Liants Polyméthacrylate de butyle Résistance aux conditions climatiques Index. décimale : 667.9 Revêtements et enduits Résumé : To meet the requirement of improved durability of alkyd resin for use in weatherwork paint for superstructure of ships, an attempt has been made to chemically modify a castor oil alkyd by graft copolymerization with methyl methacrylate and butyl methacrylate in view of their ability to provide polymers with good exterior durability. Characterization of the experimental resins, in respect to physical properties, was carried out using instruments such as a vapor pressure osmometer, rotational viscometer, universal tensile testing instrument (Instron 1123), and differential scanning calorimeter. Performance of the resins was evaluated using a fluorescent UV accelerated weatherometer and multi-head glossmeter. The results reveal substantial improvement in drying and weather resistance properties of castor oil alkyd on graft copolymerization with both methyl methacrylate and butyl methacrylate. The improvement in these properties is marginally superior in the case of MMA grafted alkyds. MMA modification also enhances the mechanical properties of the grafted castor oil alkyd. Note de contenu : - Chemicals - Synthesis of acrylated alkyd - Characterization of acrylated alkyd resins - Performance evaluation of acrylated alkyd films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17968 [article]

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Crosslink density and cure window of oligourethane diol/melamine high-solids coatings / M. Yaseen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 879 (04/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 879 (04/1998) . - p. 35-42 Titre : Crosslink density and cure window of oligourethane diol/melamine high-solids coatings Type de document : texte imprimé Auteurs : M. Yaseen, Auteur ; K. V. S. N. Raju, Auteur ; Syed Haseebuddin, Auteur Année de publication : 1998 Article en page(s) : p. 35-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Formaldéhyde Haut extrait sec Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Oligomères Polyols Polyuréthanes Réticulation (polymérisation) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Oligourethane diols were crosslinked with melamine formaldehyde, and their crosslink density was determined by using an equilibrium swelling method. In formulations containing primary or secondary hydroxylated diol the major part of the crosslinker is consumed by trans-etherification reactions and self-condensation. The aromatic nature of TDI imparts rigidity while the aliphatic IPDI results in flexibility of the backbone chain of oligomer. The profile of cure schedules has been determined in the form of a cure window which measures the extent of reaction in terms of crosslink density as a function of bake temperature. The experimentally determined properties like tensile strength and MEK rub-resistance have been taken into consideration for fixing the lower and upper limits of XLD in designing the cure windows of individual coating formulations. The baking schedules of coatings have also been expressed in the form of nominal and true cure windows. Note de contenu : - INTRODUCTION : Crosslinking reactions between polyols and melamine - Crosslink density - Techniques for the determination of crosslink density - Curing aspects of high-solids coatings - Cure window - EXPERIMENTAL : Oligourethane diol - Melamine crosslinker - Coating formulation - Preparation of free film of cured resin - Procedure for the determination of crosslink density - Calculation of crosslink density - Tensile properties - Solvent (MEK) rub resistance - DISCUSSION : Effect of bake temperature and crosslinker content of XLD - Effect of oligourethane diol on crosslink density - Influence of isocyanates used in oligourethane diols - Cure schedules - Baking schedules in terms of cure window - Nominal and true cure window Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17969 [article]

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Chemoenzymatic synthesis and characterization of urethane oils for surface coatings / Vilas D. Athawale in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 879 (04/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 879 (04/1998) . - p. 43-48 Titre : Chemoenzymatic synthesis and characterization of urethane oils for surface coatings Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; M. D. Bhabhe, Auteur Année de publication : 1998 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Two-step chemoenzymatic synthesis of urethane oils has been studied. Initially, the partial esters were prepared by lipase-catalyzed transesterification of soybean and linseed oils with n-butanol. Partial esters were further reacted with different diisocyanates to obtain urethane oils. The composition of the partial esters was varied with reaction time in the transesterification step. Among all the lipases, the lipozyme was found to be the most suitable lipase for the transesterification reaction, yielding 80-85%. All of the urethane oils were of low molecular weights irrespective of the type of oil used in their preparation. Urethane oils, based on MDI, exhibited the best scratch resistance. All of the urethane oils showed good acid and alkali resistance and excellent solvent resistance. These oils also satisfactorily passed the impact resistance and the flexibility tests. Note de contenu : - EXPERIMENTAL : Chemicals and lipases - Two-step chemoenzymatic synthesis of urethane oils - Characterization of urethane oils - IR spectroscopy - 1H-NMR spectroscopy - Determination of film properties - RESULTS AND DISCUSSION : Kinetics of lipase catalyzed transesterification of soybean and linseed oil - Effect of type of lipase - Effect of temperature - Effect of substrate to nucleophile radio - IR spectroscopy - 1H-NMR spectroscopy - Characterization and film properties of urethane oils Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17992 [article]

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VOC testing comparison : EPA method 24 versus the cal poly pomona method / C. Michael Fobar in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 879 (04/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 879 (04/1998) . - p. 49-53 Titre : VOC testing comparison : EPA method 24 versus the cal poly pomona method Type de document : texte imprimé Auteurs : C. Michael Fobar, Auteur ; V. C. Bud Jenkins, Auteur ; Charles N. Millner, Auteur Année de publication : 1998 Article en page(s) : p. 49-53 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : A new method for water determination of latex paints that gives reliable and precise results is presented. This method agrees with the results obtained using the traditional Karl Fischer titrations of EPA Method 24; therefore eliminating the need for Karl Fischer titrations. Equipment needs are minimal and the procedure is performed quickly and conveniently. Hopefully, in the future EPA Method 24 will not be the only method accepted by regulatory agencies. Until that time, however, this new method will be useful for quality control and assurance, in-house regulatory compliance monitoring, and research and development purposes. Note de contenu : - PROCEDURE : Preparation of standard calibration curve - Azeotropic extraction procedure - Sample size determination - Water content evaluation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17993 [article]

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