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Newer wood coatings for preservation and decoration of wood / Dinesh Patel in PAINTINDIA, Vol. LII, N° 6 (06/2002)

[article]  inPAINTINDIA > Vol. LII, N° 6 (06/2002) . - p. 35-38 Titre : Newer wood coatings for preservation and decoration of wood Type de document : texte imprimé Auteurs : Dinesh Patel, Auteur ; N. R. Kondekar, Auteur Année de publication : 2002 Article en page(s) : p. 35-38 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Wood is nature's gift to us. It is a part and parcel of our day to day life. The old methods of protection and decoration of wood now fully converted into newer techniques of applications for modern wood coatings. Note de contenu : - TYPES OF WOOD - PROPERTIES EXPECTATIONS FROM WOOD FINISHES - VARIOUS WOOD COATINGS : Fillers and putties for wood working - Primer-sanding sealers - Wood stains - Top coat wood finishes - TECHNIQUES OF APPLICATIONS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12362 [article]

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Superior coatings from epoxy cresol novolac resin / Mudit Goyal in PAINTINDIA, Vol. LII, N° 6 (06/2002)

[article]  inPAINTINDIA > Vol. LII, N° 6 (06/2002) . - p. 39-44 Titre : Superior coatings from epoxy cresol novolac resin Type de document : texte imprimé Auteurs : Mudit Goyal, Auteur ; Mahendra Singh, Auteur ; Dharmendra Singh, Auteur ; S. Singh, Auteur ; Vipin Shukla, Auteur Année de publication : 2002 Article en page(s) : p. 39-44 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Bisphenol-A epoxy resin have certain inherent drawbacks. the limitation could be overcome by replacing them with multifunctional epoxy resins such as epoxy phenol novolac (EPN) and epoxy cresol novolac (ECN) resins. Synthesis and characterization of EPN and ECN has been discussed. ECN resin were observed to be much superior so that a comprehensive study was made of the various coating properties such as drying time, hardness, adhesion, gloss, flexibility, skinning tendency, corrosion, impact-resistance and chemical resistance of cresol novolac epoxy cured with polyamide resin. Note de contenu : - METHODS : Synthesis of novolac resins - Synthesis of epoxy novolac resins - DETERMINATION OF EPOXY EQUIVALENT WEIGHT (EEW) : Reagents - Procedure - Calculation - EVALUATION OF FILM CHARACTERISTICS - RESULTS AND DISCUSSION : Drying time - Hardness - Gloss - Salt-spray test - Impact resistance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12363 [article]

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Development of low-temperature self-curable water soluble polyepoxide coatings for cathodic electrodeposition / Pramod Kumar in PAINTINDIA, Vol. LII, N° 6 (06/2002)

[article]  inPAINTINDIA > Vol. LII, N° 6 (06/2002) . - p. 45-66 Titre : Development of low-temperature self-curable water soluble polyepoxide coatings for cathodic electrodeposition Type de document : texte imprimé Auteurs : Pramod Kumar, Auteur ; M. K. Trivedi, Auteur Année de publication : 2002 Article en page(s) : p. 45-66 Note générale : Biliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxidised phenol-novolac (EPN) type of polyepoxide resin was used for developing water-soluble cathodically electro-depositable coatings which could be self-curable without using any external/additional cross-linking agent. The self-curing of cathodically deposited films could be effected at a low temperature of 80°C in 30 min, as compared to 150-170°C in 30 min practised presently in many commercial cathodic electro-deposition (CED) installations. In this work, effect of varying molar ratio of secondary amines such as diethanol amine (DEtOA) and diethyl amine to epoxidised phenol-novolac (EPN) on the solubility of EPN-secondary amine adducts prepared at 80, 60 and 30°C for varying reaction times was investigated. Self-curing characteristics of EPN-DEtOA (1:2 moles) adduct at 30-160°C were studied. Kinetics of film growth during CED was investigated by using aqueous solutions of acetic acid neutralised EPN-DEtOA (1:2 moles) adduct. Variables for kinetic studies were deposition time (30-600 s), applied voltage (5-250 V) and solution concentration (1-20% (w/w)). By carrying out CED of polyepoxide films, values of electro-deposition (ED) characteristics found were: ED yield as 5.89 mg/cm2, Coulombic yield as 19.78 mg/C and dry film thickness (DFT) as 52.12 μm. Plots of DFT vs. deposition time (t), DFT vs, t1/2 and current density vs. field strength were drawn to calculate the values of Coulombic efficiency of the process and film conductivity. Cathodically electro-deposited films were finally characterised for physical properties, chemical resistance and corrosion protection performance. Note de contenu : - Equipments - Reactor assembly - Electrodeposition cell - EXPERIMENTAL PROCEDURES : modifications of EPN resin for cathodic electrodeposition - Determination of Tertiary Amine Value (TAV) of the prepared adduct - Infrared spectroscopy - Cathodic Electrodeposition of films - Determination of degree of cure - Physical examination of film properties - Chemical resistance of films - Protection by films against corrosion - RESULTS AND DISCUSSION : Effect of molar ration of EPN to DEtOA on the characteristics of adduct - Effect of molar ration of EPN to DEA on the characteristics of adduct - Effect of reaction temperature and time on the characteristics of EPN-DEtOA (1:2 Moles) adducts - Curing characteristics of adduct films - Cathodic Electrodeposition of adduct films - Effect of deposition time on ED characteristics - Effect of applied voltage on ED characteristics - Effect of solution concentration - Effect of solution pH - kinetics of film growth during cathodic electrodeposition - Dry film thickness - Current density - Specific conductivity of the deposited film - Physical properties of films - Chemical resistance of films - Acid resistance - Methanol resistance - Corrosion resistance of films - CONCLUSIONS : Based on the findings of this work, following conclusions can be drawn - TECHNOLOGICAL CONTRIBUTION TO COATING INDUSTRY Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12364 [article]

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Studies on speciality monomers from rosin / Himadri Panda in PAINTINDIA, Vol. LII, N° 6 (06/2002)

[article]  inPAINTINDIA > Vol. LII, N° 6 (06/2002) . - p. 67-76 Titre : Studies on speciality monomers from rosin Type de document : texte imprimé Auteurs : Himadri Panda, Auteur ; Rakhshinda Panda, Auteur Année de publication : 2002 Article en page(s) : p. 67-76 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Different monomers were prepared by reacting rosin with different salts of acrylic acid. These products are useful in ultraviolet and electron beam coatings, inks and adhesives. Note de contenu : - Experimental : General reaction condition - Analytical procedure - Discussion : Structure property relationshyp - Commercial applications (1) High solids coatings, 2) Acrylated epoxy resin, 3) Radiation curable coating, 4) Electrodeposition, 5) Interpenetrating network(IPN), 6) Non-aqueous dispersions(NAD) ) Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12372 [article]

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High performance metallics - from gold leaf to press ready metallic inks / Christa Prigoana-Muller in PAINTINDIA, Vol. LII, N° 6 (06/2002)

[article]  inPAINTINDIA > Vol. LII, N° 6 (06/2002) . - p. 77-82 Titre : High performance metallics - from gold leaf to press ready metallic inks Type de document : texte imprimé Auteurs : Christa Prigoana-Muller, Auteur ; Robert Besold, Auteur Année de publication : 2002 Article en page(s) : p. 77-82 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The history of metal pigments for inks and coatings dates back to the old days of the goldbeater's handcraft several hundred years ago. The oversize of the gold leafs was finely dispersed in warnishes and used for paintings and all kinds of graphic arts. The alchemists of the middle ages failed in the search for a chemical synthesis of real gold. It have been the craftsmen who found a way to imitate gold: they took a thin foil of a copperzinc-alloy (Tombak) and treated it like the real gold in a beating process and developed the "imitation gold" besides the genuine gold leaf. Also here, the oversize was disintegrated and finely dispersed into the first "gold bronze pigments". A similar way took the development of the "silver bronze" by using aluminum instead of genuine silver in the beating process. During the last century, both technologies - gold beating and manufacturing of metal pigments - underwent a fast development from the handcraft in the early days to industrialized and more or less fully computerized production process. The industrialization of metal pigments started with the so called stamping process, where the metal particles have been beatin in mechanically rising and falling hammers (up to 36 stamps per units) This technology (still in use for some special products for non pigment applications) was soon substituted by ball milling processes in the early 20th century. In our days gold bronze pigments are produced in dry milling processes, followed by classification and polishing processes according to the requirements of the final application. Note de contenu : - Product description and characterization - Particle shape and dispersion - From metal powder to predispersed pastes and granules - Environmentally friendly, low VOC printing inks - From pigment compositions to ready mixed inks Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12373 [article]

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