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A review on blocked isocyanates in coatings / S. Subramani in PAINTINDIA, Vol. LII, N° 2 (02/2002)
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Titre : A review on blocked isocyanates in coatings Type de document : texte imprimé Auteurs : S. Subramani, Auteur Année de publication : 2002 Article en page(s) : p. 33-44 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The preparation of many coatings, foams and elastomers involves a rapid crosslinking reaction between isocyanates and hydroxy functional resins. Because the isocyanate functionality is highly reactive, it must be isolated from the functional resin prior to use. The desirability of one-pack systems for many end use applications has led to the development of blocked isocyanate materials. Blocked polyisocyanates have picked up with technical progress in the coatings field and are promising a bright future. They should be considered as an integral part of polyurethane coatings technology. Note de contenu : - General properties of polyurethane coatings
- Polyurethane coating raw material
- Technical advantage of blocked isocyanates
- Blocking agents
- Phenol blocked polyisocyanates
- Alcohols
- Caprolactam blocked polyisocyanates
- β-dicarbonyl blocking agents : Malonates and acetoacetates
- Bisulfite blocked polyisocyanates
- Formation and hydrolysis of bisulfite blocked isocyanates
- Oxime blocked polyisocyanates
- Cationic electrodeposition
- Hydroxamic acid esters
- Triazoles
- Heterocyclic ring opening reactions
- Applications and limitations of blocked isocyanatesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12303
in PAINTINDIA > Vol. LII, N° 2 (02/2002) . - p. 33-44[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001278 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and properties of imidazole-blocked diisocyanates / S. Subramani in PAINTINDIA, Vol. LII, N° 1 (01/2002)
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Titre : Synthesis and properties of imidazole-blocked diisocyanates Type de document : texte imprimé Auteurs : S. Subramani, Auteur Année de publication : 2002 Article en page(s) : p. 61-70 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Imidazole-, 2-methylimidazole-, and benzimidazole-blocked hexamethylene diisocyanate and isophorone diisocyanate were prepared and characterized by elemental analyses, IR and NMR spectroscopy. The structure-property relationship of these adducts has been established by reacting with hydroxyl-terminated polybutadiene (HTPB). The cure rate of the adduct increases from the imidazole to 2-methylimidazole and to benzimidazole blocked adduct. Also, the cure rate of the adducts based on hexamethylene diisocyanate is higher than those based on isophorone diisocyanate. Simultaneous TGA/ DTA results also confirm this trend. The gas chromatogram of the imidazole blocked isocyanate confirms that thermolysis products are blocking agents and isocyanate. The solubility of the adducts were carried out in polyether and hydrocarbon polyols, and it was found that the 2-methylimidazole and benzimidazole-blocked hexamethylene diisocyanate adducts show higher solubility than the rest. Note de contenu : - Preparation of blocked diisocyanates
- Characterization methods of the blocked diisocyanate
- Thermal analysis
- GC analysis
- Gel time studies
- Solubility testPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12256
in PAINTINDIA > Vol. LII, N° 1 (01/2002) . - p. 61-70[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001277 - Périodique Bibliothèque principale Documentaires Disponible