Alkylated phenolic antioxidants for paints / V. C. Malshe in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B2 (05/2005)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B2 (05/2005) . - p. 145-148 Titre : Alkylated phenolic antioxidants for paints Type de document : texte imprimé Auteurs : V. C. Malshe, Auteur ; S. Elango, Auteur Année de publication : 2005 Article en page(s) : p. 145-148 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alkylation Antioxydants Blanc (couleur) Brillance (optique) Evaluation Formaldéhyde Jaunissement (défaut) Phénols Résistance au jaunissement Revêtements -- Additifs:Peinture -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Polymeric antioxidants based on p-cumyl phenol formaldehyde resin (PCPF), p-nonyl phenol formaldehyde (PNPF) and p-octyl phenol formaldehyde (POPF) were prepared by condensation reaction of respective phenols with formaldehyde in presence of an acid catalyst. The reactions were monitored by TLC and the melting point of the products was determined by open capillary method. Stabilising the action of PCPF, PNPF for protecting paint against thermal oxidation was tested using a QUV weatherometer. The effect of exposure on the properties of paints such as gloss, whiteness and yellowness were evaluated. Results show that paints containing these new polymeric antioxidants possess better stabilising effects against photo-oxidation than those employed in standard paints available in the market. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - RESULTS AND DISCUSSION : Evaluation of prepared compounds as antioxidants - GLOSS : Effect of antioxidants (at 10, 100, 200 and 300 ppm) on gloss - Whiteness and yellownes - Effect of antioxidants (at 10, 100, 200 and 300 ppm) on whiteness - Effet of antioxidants (at 10, 100, 200 and 300 ppm) on yellowness DOI : 10.1007/BF02699547 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699547.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5429 [article]

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Substituted benzotriazole as UV absorber for paints / V. C. Malshe in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B4 (12/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B4 (12/2004) . - p.277-284 Titre : Substituted benzotriazole as UV absorber for paints Type de document : texte imprimé Auteurs : V. C. Malshe, Auteur ; S. Elango, Auteur Année de publication : 2004 Article en page(s) : p.277-284 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Antioxydants Benzotriazole Blancheur Brillance (optique) Composés organiques -- Synthèse Jaunissement (défaut) Phénols Photostabilisants Revêtements -- Additifs:Peinture -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Substituted benzotriazoles were synthesised from 4-amino-3-nitro benzophenone and couplers such as b-Naphthol (BN), p-Cresol (PC) and 2,6-xylenol (XY). The reactions were monitored by thin layer chromatography (TLC). The products were characterised by melting point, ultraviolet (UV) and infrared (IR) spectra. Stabilising action of prepared 2-(5-Benzoyl-2H-benzotriazol-2yl)-4methyl phenol, 2-(5-Benzoyl-2H-benzotriazol-2yl)-4,6-dimethyl phenol and 2-(5-Benzoyl-2H-benzotriazol-2yl)-naphthol for protecting paint against photo-oxidation was examined by a QUV weatherometer. The effect of exposure on the properties of paints such as gloss, whiteness and yellowness was evaluated. Results show that paints containing prepared UV absorbers (UVA) possessed better stabilising effects against photo-oxidation than those employed on standard paints available in the market. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - analysis - Testing for evaluation of UV absorbers - RESULTS AND DISCUSSION : Gloss - Yellowness and whiteness indices DOI : 10.1007/BF02699677 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699677.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5449 [article]

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