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Studies on the properties of β-ketoester modified hydroxylated polyesters based high solids polyurethane coatings / Ramanuj Narayan in PAINTINDIA, Vol. LI, N° 7 (07/2001)

[article]  inPAINTINDIA > Vol. LI, N° 7 (07/2001) . - p. 35-48 Titre : Studies on the properties of β-ketoester modified hydroxylated polyesters based high solids polyurethane coatings Type de document : texte imprimé Auteurs : Ramanuj Narayan, Auteur ; K. V. S. N. Raju, Auteur Année de publication : 2001 Article en page(s) : p. 35-48 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  'Peinture  bi-composant'  haute  teneur  solide'  Polyuréthane  Formulation  Liant  Polyester  Hydroxylation  modifié'  Cétoester  Préparation  'Propriété  rhéologique'  Viscosité  'Effet  température'  Performance  Adhérence  Feuil  mécanique'  'Résistance  corrosion'  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Two Pack High Solids Polyurethane Coatings (HSCs) are becoming more and more accepted as an alternative to conventional systems in various segments of the industrial coatings market not only because of their environmental effect, but also for their technical performance. As regulations become more restrictive, the efforts have been shifted towards the increase of application solids of HSCs or solventless coatings. The increase of application solids can be effected either by reducing the molecular weight of the oligomers or by reduction in viscosity of the oligomer. Hydroxylated Polyesters (HPs) is one of the important oligomeric precursors for the development of two pack polyurethane HSCs and the wide array of monomers available for its synthesis give enough scope for researchers to design oligomers of their choice. In this paper, two approaches have been adopted for the reduction of viscosity or to increase the application solids. The first is to replace main diol moiety NPG in a most widely used HP formulation based on adipic acid, isopthalic acid, trimethylol propane and neopentyl glycol (NPG) with 1,4 cyclohexane dimethanol and 1,3 propane diol, while the second is to introduce β-ketoester moiety in different percentages to the resultant three HPs backbone. The oligomers were characterised by gel permeation chromatography and differential scanning calorimetry. The influence of diol structures, percent β-ketoester incorporation and temperature of HPs has been studied. The results indicate that the replacements of diels and B.ketoester incorporation helps in significant reduction of viscosity of HPs. The potentialities of these HPs in coating formulation have been studied by developing two pack clear coats with diphenylmethane diisocyanate. The performance of these coatings were evaluated by determining their tensile properties, dynamic mechanical properties, corrosion resistance properties, adhesion and other coating properties such as flexibility, impact, abrasion, etc. The crosslink density (XLD) was calculated by using dynamic mechanical thermal analyser (DMTA) data. An attempt has been made to correlate both the quantitative and qualitative results so that it can give some insight into the intelligent design of coating systems for long term performance. The results indicate that the β-ketoester incorporation in HPs backbone not only helps in achieving higher application solids but also improved coating properties, depending upon the extent of incorporation. Note de contenu : - Experimental : Materials – Preparation of hydroxylated polyesters - Characterisation : Determination of molecular weight, glass transition temperature and viscosity - Results and discussion : Molecular weight and Tg – Diol variation and viscosity – Effect of β-keteoester on the viscosity – Effect of temperature - Formulation and performance evaluation of coatings : Coating formulation – Preparation of test specimen – Test procedures – Percent solids of coatings – Adhesion – Tensile properties – Correlation between adhesion and tensile strength – Dynamic mechanical properties – Storage modulus, E’ – Determination of crosslink density, Mc and Tg from DMTA measurements – Routine or conventional performance evaluation of coatings – Corrosion resistance properties – Correlating the tensile properties, dynamic properties and routine test methods Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12609 [article]

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Superior coatings from cyclohexanone formaldehyde-CNSL-epoxy blends / Vilas D. Athawale in PAINTINDIA, Vol. LI, N° 7 (07/2001)

[article]  inPAINTINDIA > Vol. LI, N° 7 (07/2001) . - p. 49-52 Titre : Superior coatings from cyclohexanone formaldehyde-CNSL-epoxy blends Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; Narendra J. Shetty, Auteur Année de publication : 2001 Article en page(s) : p. 49-52 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  Peinture  Formulation  Liant  'Résine  époxyde'  'Noix  cajou'  Cyclohexanone  Formaldéhyde  Préparation  'Propriété  mécanique'  Feuil  Séchage  Dureté  optique'  Brillant  Adhérence  Flexibilité  chimique'  'Résistance  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : A comprehensive study of the various coating properties such as drying time, hardness, adhesion, gloss, flexibility, skinning tendency, corrosion, impact resistance and chemical resistance of blends of ketonic (cyclohexanone formalde-hyde)-CSNL-epoxy resin was carried out in the laboratory. The two constituents of the blends were mixed in various blend ratios and their aforesaid coating properties were ascertained. The study revealed that 60:40 percent (w/w) ratio of the two blend components exhibited remarkable improvement in the various coating properties over that of the resins taken individually. Note de contenu : - Materials - Synthesis - Test carried out for the study of coating properties - Drying time - Hardness - Gloss - Adhesion and flexibility - Storage stability - Chemical resistance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12610 [article]

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Synthesis of alkyld resins via acylation for high performance industrial coatings / D. V. Gaykar in PAINTINDIA, Vol. LI, N° 7 (07/2001)

[article]  inPAINTINDIA > Vol. LI, N° 7 (07/2001) . - p. 55-60 Titre : Synthesis of alkyld resins via acylation for high performance industrial coatings Type de document : texte imprimé Auteurs : D. V. Gaykar, Auteur Année de publication : 2001 Article en page(s) : p. 55-60 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Alkyde  résine'  'Matériau  revêtement'  Préparation  Polycondensation  Estérification  'Huile  végétale'  ricin''Anhydride  organique'  Cinétique  'Relation  composition  propriété'  'Dureté'  'Résistance  chimique'  Utilisation  'Peinture  émail'  'Etude  expérimentale'  'Propriété  mécanique' Index. décimale : 667.9 Revêtements et enduits Résumé : The study investigates the synthesis of castor oil based alkyds by adopting a novel acylation route. Castor oil was allowed to react with anhydride to yield a secondary half ester, which upon further esterification with polyol and polyacids gave superior quality alkyd resins, which can find large applications in cost effective high performance industrial coatings. The molecular weights of the alkyds prepared by the acylation process, MG process and fatty acid process were recorded. Various anhydrides such as phthalic, tetrahydro phthalic and hexahydro phthalic were compared for the degree of acylation. The mechanical and chemical properties of the white enamel based on the alkyd resin prepared by the acylation technique was compared with that of alkyd resin based on the MG route and the fatty acid route having the same oil length, molecular weight and hydroxyl value. Note de contenu : - Synthesis of castor oil based alkyld by acylation technique - Results : Comparative study of different anhydrides during acylation - The evidence for the formation of secondary halfester - Effect of temperature - Effect of the anhydride used - Effect of catalyst - Effect of oil length Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12619 [article]

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Luminescent benzanthrone colorants / N. Sekar in PAINTINDIA, Vol. LI, N° 7 (07/2001)

[article]  inPAINTINDIA > Vol. LI, N° 7 (07/2001) . - p. 61-64 Titre : Luminescent benzanthrone colorants Type de document : texte imprimé Auteurs : N. Sekar, Auteur Année de publication : 2001 Article en page(s) : p. 61-64 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Colorant  organique'  'Composé  fluorescent'  azométhinique'  benzénique  condensé'  tétracyclique'  polycyclique'  aromatique'  'Hétérocycle  soufre'  'Benzo[de]anthracén-7-one(3-dialkylamino)'  'Benzo[de]anthracène  dérivé'  'Benzo[de]anthracén-7-one(3-alcoxy)'  'Benzo[de]anthracén-7-one(3-arylamino)'  Benzoanthracène  'Anthra[2,1,9-mna]thioxanthène  Anthrathioxanthène; Index. décimale : 667.9 Revêtements et enduits Résumé : The progress in the area of 3-amino, 3-alkoxy, 3-thioalkyl, 3-thioaryl, 3-thiohetaryl benzanthrone derivatives, azomethine benzanthrones and 14H[2.1.9-mna] thioxanthene-14-one derivatives is reviewed. Note de contenu : - 3-Alkoxybenzanthrones - 3-Thioalkoxy and thioaryloxy benzanthrones - 3-Aminobenzanthrone derivatives - 3-Triazinylaminobenzanthrones - Benzanthrone azomethine derivatives Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12620 [article]

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Metal effect pigments / Gunther Sommer in PAINTINDIA, Vol. LI, N° 7 (07/2001)

[article]  inPAINTINDIA > Vol. LI, N° 7 (07/2001) . - p. 77-82 Titre : Metal effect pigments Type de document : texte imprimé Auteurs : Gunther Sommer, Auteur Année de publication : 2001 Article en page(s) : p. 77-82 Langues : Anglais (eng) Tags : Encre  'Pigment  métallique'  'Propriété  optique'  'Dimension  particule'  'Forme  'Orientation  préférentielle'  'Réactivité  chimique'  'Impression  plat' Index. décimale : 667.9 Revêtements et enduits Résumé : Gold and silver inks give exquisite products a higher appreciation. In order to achieve such special decorative effects, metal pigments are applied also in printing inks. The possibilities these decorative inks offer to the graphic art industries are of great multiplicity and still have not been exhausted. The following is a view on production and properties of the metal effect pigments as well as the resulting problems concerning the different printing applications. The production of metal pigments has long tradition; it has developed from the gold beaters craft which existed already in 1000 B.C. The waste resulting from the gold leaf production was pulverized in a mortar, pasted with a binder and used as paint. This process was also applied on other metal leaves. For historical reasons, metal effect pigments are therefore called "silver" - and "gold bronze", although - from the metallurgical point of view - they have nothing to do with gold, silver or bronze. They are made of aluminium, copper and brass pigments (copper - zinc-alloy). Note de contenu : - Copper and zinc for gold bronze pigments, aluminium for silver shades - Sparkling effects - Particule size and shape - Leafing and non-leafing - Pigment orientation - Mechanical endurance - Chemical reactivity of metallic pigments - Particularities in the application of metal pigments : Dusting - Rotogravure/flexo printin - Offset printing inks - Result Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12621 [article]

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