2K PU high solids: effect of diol structure / K. V. S. N. Raju in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/01 (07-08/2001)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/01 (07-08/2001) . - p. 40-46 Titre : 2K PU high solids: effect of diol structure Type de document : texte imprimé Auteurs : K. V. S. N. Raju, Auteur ; Ramanuj Narayan, Auteur Année de publication : 2001 Article en page(s) : p. 40-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of diol structure of neopentyl glycol, 1,4-cyclohexanedimethanol and 1,3-propanediol on the physical properties of hydroxylated polyesters (HPs) are reported here. The HPs were characterised by gel permeation chromatography, viscometry and differential scanning calorimetry. The results indicate that the diol structure has significant effect on the viscosity and glass transition temperature of HPs. The potentialities of these HPs in coating formulation have been studied by developing two pack polyurethane clear coats with diphenylmethane diisocyanate. The performance of these coatings were evaluated by determining their tensile properties, dynamic mechanical properties, adhesion and other empirical coating properties such as flexibility, impact, abrasion, etc. The crosslink density (XLD) was calculated by using dynamic mechanical thermal analyser (DMTA) data. Note de contenu : - Hydroxylated polyester as reactive oligomeric precursor - Experimental - Hydroxylated polyester - Characterization - Coating formulations - Preparation of coating free films - Coating on metal substrate - Test procedures - Results and discussion - The tensile strength values of the coatings follows the order HP200>HP100>HP300 - The pull off adhesion strength value could be an indirect measure of tensile strength - Results indicate good scratch resistance as well as mechanical strength of coatings En ligne : https://drive.google.com/file/d/1AMfEjD1nVv2Mvp9zd11NB7RyLRAtZGCJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10949 [article]

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Applicability and WLF equation to polyurethane polyols and film properties of their resins / Syed Haseebuddin in PAINTINDIA, Vol. XLV, N° 12 (12/1995)

[article]  inPAINTINDIA > Vol. XLV, N° 12 (12/1995) . - p. 55-59 Titre : Applicability and WLF equation to polyurethane polyols and film properties of their resins Type de document : texte imprimé Auteurs : Syed Haseebuddin, Auteur ; K. V. S. N. Raju, Auteur ; M. Yaseen, Auteur Année de publication : 1995 Article en page(s) : p. 55-59 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  haute  teneur  solide'  Liant  'Uréthanne  polymère'  Polyol  Préparation  'Propriété  rhéologique'  Viscosité  'Composé  organique  volatil'  Formulation  'Température  transition  vitreuse'  mécanique'  Feuil  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : The need to reduce solvent content of coatings in compliance to air pollution and other Statutory Regulations has led to major efforts to develop high solids coatings. The reduction in molecular weight helps to achieve application viscosity by an increase in free volume. Various polyurethane polyols have been synthesised by reacting the diols with polyisocyanates. The molecular weight and polydispersity indexes of these polyols have been determined by gel permeation chromatography (GPC). The viscosity of 50%. polyol solutions in various solvents has been determined at different temperatures. The temperature dependence on viscosity of solution of these polyols has been determined by the Williams, Landel and Ferry (WLF) equation. The non-linear regression analysis has been solved by using Levenberg Marquardt's algorithm. It is found that non-linear regression analysis gives high correlation coefficients and very low overall residual errors. The variation in the values of constants A and B for each WLF equation in the polyol solution indicates that these constants are system dependent. The values of constants A and B obtained for polyurethane polyols in a particular solvent have been used to calculate the values of glass transition temperature of the oligomer solution (Tg,) at different concentrations. The values of Tg, are found to vary with concentration. As the concentration of polymer increases there is an increase in the Tg, value. The tensile properties and resistance to scratch of resins prepared using these polyols and butylated melamine formaldehyde are better than those of conventional resins. The VOC content of these coating formulations is lower than the value prescribed by the Environmental Protection Agency (EPA). Note de contenu : - Experimental : Viscosity determinations - Equations used for analysing viscosity data - Preparation of coating formulations - Determination of VOC - Results and Discussion : Applicability of WLF equation - Temperature dependency of viscosity - Volatile organic component (VOC) - Properties of the baked coatings of the resin - Tensile properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13691 [article]

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Basic concept of paint technology and interaction parameters / K. V. S. N. Raju in PAINTINDIA, Vol. XLVI, N° 3 (03/1996)

[article]  inPAINTINDIA > Vol. XLVI, N° 3 (03/1996) . - p.19-24 Titre : Basic concept of paint technology and interaction parameters Type de document : texte imprimé Auteurs : K. V. S. N. Raju, Auteur ; M. Yaseen, Auteur Année de publication : 1996 Article en page(s) : p.19-24 Langues : Anglais (eng) Tags : Peinture  Liant  Solvant  Pigment  'Matière  charge'  Adjuvant  'Concentration  pigmentaire  volumique  critique' Index. décimale : 667.9 Revêtements et enduits Résumé : The growing organic materials production potential calls for the industry to take several factors into consideration while diesigning a paint formulation. It i essential to charcterise it carefully before the coating formulation becomes commercial product. The majority of paint formulations are composed of components like pigments, resins, solvents, and additives. The knowledge abut their interaction parameters among the components of the paint formulation is very essential to access their compatibility . The sdesign of an organic coatig/paint formulation requires the understanding and establishing the phenomena involved from the stage of its preparation to the stage of it being used in actual service. In recent years, the physico-chemical properties of individual components and their intercation parameters are being examined more critically before a paint is formulated. This practice requires data on interaction and other physical parameters of the main components of the paint formulation. The information provided here on various aspects of raw materials and about their interaction parameters may help in designing paint formulations. This also provides information about the effect of internal and external physico- chemical parameters on the properties of coatings in service. Note de contenu : - Resin : Lacquers - dispersion media/vehicles - Latex systems - Chemically curable systems - Solvents - Resin - solvent interaction - Compatibility of resin with solvents - Effect of temperature on solvency power of solvents - Pigments : inorganic pigments - Organic pigments - Extender pigments - metallic pigments - properties of pigments - selection of pigments - Pigment - solvent interaction - Characterization of pigment surface - Resin - solvent - pigment interaction - Desing of paint formulations - Additive - Pigment volume concentration (PVC) - Critical pigment volume concentration (CPVC ) - Effects of solvents on CPVC - Comments on CPVC determination Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13417 [article]

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Comparative performance evaluation of paint systems based on uralkyd, alkyd and two pack polyurethanes / Ramanuj Narayan in PAINTINDIA, Vol. XLVIII, N° 9 (09/1998)

[article]  inPAINTINDIA > Vol. XLVIII, N° 9 (09/1998) . - p. 116-122 Titre : Comparative performance evaluation of paint systems based on uralkyd, alkyd and two pack polyurethanes Type de document : texte imprimé Auteurs : Ramanuj Narayan, Auteur ; K. V. S. N. Raju, Auteur ; M. Yaseen, Auteur Année de publication : 1998 Article en page(s) : p. 116-122 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  Peinture  Liant  Polyuréthane  'Alkyde  résine'  'Peinture  bi-composant'  Préparation  Adhérence  'Propriété  mécanique'  Feuil  Dureté  'Résistance  traction'  corrosion'  humidité'  chimique'  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Uralkyds, the simplest type of urethanes in which curing occurs by oxidation of the double bonds in its fatty acid portion have been prepared and the properties of their paint formulations are determined and compared with those of alkyd and two pack polyurethane. The practical test data of physico-chemical, mechanical and corrosion resistant properties indicate the superiority of uralkyds over alkyds and their proximity to two pack polyurethane coatings. Based on the findings uralkyds could be recommended for protective coating systems where quick air drying, ease of application, better protective properties and low cost are the criteria of the choice of coating system. Note de contenu : - CHARACTERISATION OF RESINS : Preparation of test specimen (Coatings on metal substrate, Coatings on tin foil for tensile properties, Coating on test tubes for chemical resistance) - RESULTS AND DISCUSSION : Adhesion - Scratch hardness - Tensile strength - Impact and flexibility - Corrosion resistant properties ( Salt spray, Resistance to humidity, Chemical resistance properties) Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13190 [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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Cure behaviour and performance evaluation of segmented polyurethane-urea coatings / Dipak K. Chattopadhyay in PAINTINDIA, Vol. LV, N° 8 (08/2005)

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Development of hyperbranched polyurethane coatings : effect of chain extender and NCO/OH ratio / Aswini K. Mishra in PAINTINDIA, Vol. LXI, N° 11 (11/2011)

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Development of moisture cure polyurethane–urea coatings using 1,2,3-triazole core hyperbranched polyesters / Sasidhar Kantheti in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)  

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DMTA: a versatile instrument for coatings industry / Ramanuj Narayan in PAINTINDIA, Vol. LI, N° 11 (11/2001)

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Effect of hydroxyl number and polymerization techniques on the properties of acrylic-melamine coatings / Dipak K. Chattopadhyay in PAINTINDIA, Vol. LIII, N° 6 (06/2003)

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Flexible, hard, and tough biobased polyurethane thermosets from renewable materials : glycerol and 10-undecenoic acid / Varaprasad Somisetti in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)  

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Influence of dibasic acids on the properties of modified polyurethane coatings / Syed Haseebuddin in SURFACE COATINGS INTERNATIONAL, Vol. 78, N° 2 (02/1995)

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Nanotechnology for coating industry - an overview / K. V. S. N. Raju in PAINTINDIA, Vol. LVI, N° 1, Sup (01/2006)

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Novel waterborne hyperbranched polyurethane-urea-silica hydrid crosslinked coatings films / Kishore K. Jena in PAINTINDIA, Vol. LXI, N° 12 (12/2011)

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Oligourethane diol/melamine high solids / M. Yaseen in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/97 (05/1997)

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Powder coatings performance : Influence of baking schedules and thickness / M. Yaseen in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/97 (06/1997)

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Properties of acrylic-melamine coatings based on high conversion prepolymer / Dipak K. Chattopadhyay in PAINTINDIA, Vol. LIII, N° 7 (07/2003)

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Roof cooling materials and coatings : An emerging technology / Siva Sankar Pandar in PAINTINDIA, Vol. LIV, N° 11 (11/2004)  

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Specific crosslinking effects of poly(epichlorohydrin)-triol on urethane polymer matrix of castor seel oil-based coatings / T. O. Siyanbola in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

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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)

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