High thermal resistant insulating varnish based on natural resin shellac and alkyd/polyamide resins / D. N. Goswami in PAINTINDIA, Vol. LIX, N° 12 (12/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 12 (12/2009) . - p. 73-80 Titre : High thermal resistant insulating varnish based on natural resin shellac and alkyd/polyamide resins Type de document : texte imprimé Auteurs : D. N. Goswami, Auteur ; P. C. Jha, Auteur ; K. Mahato, Auteur Année de publication : 2009 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Isolants Vernis -- Constituants Tags : 'Vernis  isolant'  'Résine  gomme/laque'  alkyde/polyamide'  'Résistance  diélectrique'  thermique'  humidité' Index. décimale : 667.9 Revêtements et enduits Résumé : Shellac resins - Insulating varnish compositions have been developed based on blends of solutions of natural resin shellac and synthetic resins viz., alkyd/polyamide resins, producing films having high dielectric strength, thermal resistance (~230°C) and also resistance towards humidity/water besides other desirable properties. The film properties of such blends have so far been ot reported. The method of preparation has been made simple. The varnish compositions satisfy the basic requirements of insulating varnishes as per BIS specifications. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9047 [article]

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Multipurpose glazing varnish based on shellac and synthetic resin / D. N. Goswami in PAINTINDIA, Vol. LVIII, N° 2 (02/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 2 (02/2008) . - p. 67-88 Titre : Multipurpose glazing varnish based on shellac and synthetic resin Type de document : texte imprimé Auteurs : D. N. Goswami, Auteur ; D. D. Singh, Auteur ; B. Baboo, Auteur Année de publication : 2008 Article en page(s) : p. 67-88 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Laque et laquage Polymères Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Metal objects/artifacts made of brass, copper, aluminium etc. varnish on exposure to atmosphere. These require periodic cleaning of the oxidative coating by rubbing/polishing formulations. Similarly, other materials like plastic, resin, painted artworks, murals, rubber etc. become dull and unattractive with the passage of time. Restorers/commercially available grinding/polishing formulations do not provide long lasting protection from tarnishing of metal objects ; also require periodic cleaning by rubbing/polishing. Consumers prefer use of coating, which is more permanent in nature and avoids frequent application of restorer. A varnish formulation based on shellac and synthetic resin, has been developed ; application of double coat (or more, if required) provides sheen on the surface, which remains unaffected for 2-3 years i.e., it eliminates frequent rubbing/polishing of the artefacts. The films of the varnish maitain glossy appearance for a period much longer than that of varnish from shellac alone or compared to commercial rubbing/polishing formulations even after exposure to environmental stress. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7369 [article]

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