Advances in UV curable coatings using photolatent additives / Anju T. Gidwani in PAINTINDIA, Vol. LIX, N° 4 (04/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 4 (04/2009) . - p. 87-100 Titre : Advances in UV curable coatings using photolatent additives Type de document : texte imprimé Auteurs : Anju T. Gidwani, Auteur Année de publication : 2009 Article en page(s) : p. 87-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Revêtements -- Additifs Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Recent advances in photolatent additives for UV curing helps in doing away with the shortcomings of conventional UV curable systems. There are intrinsic limitations associated with radical photo polymerization such as oxygen inhibition, insufficient curing of shadow areas, poor coating of thick and highly pigmented coating, lack of adhesion on certain substrate. All these limitations can be overcome by recent development using photolatent additives and thus support the expansion of the scope of UV curing technology in industrial and automotive application. Photolatent bases are stable and inactive in the dark when incorporated in coating systems, but efficiently releases tertiary amines or amidines on irradiation with uv or daylight. Variety of formulation can be crosslinked by photolatent base catalyst. The new technology allows adjustable speed UV and daylight curing, as well as post cure of poorly exposed and shadow areas on three dimensional objects. It also extends the pot life of 2K systems, which have to be mixed prior to the application. Another exciting application of photolatent effect is the addition of pleasant smell in paint using photolatent fragrance additives. Also photo induced effect can be obtained by using photolatent colorants. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6826 [article]

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Novel route for the syntheis of low VOC polyurethane dispersion / Anju T. Gidwani in PAINTINDIA, Vol. LIX, N° 8 (08/2009)

[article]  inPAINTINDIA > Vol. LIX, N° 8 (08/2009) . - p. 69-84 Titre : Novel route for the syntheis of low VOC polyurethane dispersion Type de document : texte imprimé Auteurs : Anju T. Gidwani, Auteur Année de publication : 2009 Article en page(s) : p. 69-84 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions Polyuréthanes Revêtements Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : High requirements converning environmental protectionare the reason for an increased interest in low VOC coatings technologies. One strategic route is the development of waterborne coating systems. Due to versatility, aqueous polyurethane dispersions (PUD) are of special interest. The various processes for the synthesis of solvent free PUDs which includes ketazine process, melt dispersion process, acetone and NMP processes have been described in details. Alternative solvents to NMP replacement in polyurethane synthesis have been elaborated. Comparative study of NMP and acetone process has been described and how the composition parameters play the key role in the synthesis of a low VOC or zero VOC PUD. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6832 [article]

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