Depth profile of UV-induced wood surface degradation / V. Jirous-Rajkovic 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. 241-247 Titre : Depth profile of UV-induced wood surface degradation Type de document : texte imprimé Auteurs : V. Jirous-Rajkovic, Auteur ; H. Turkulin, Auteur ; E. R. Miller, Auteur Année de publication : 2004 Article en page(s) : p. 241-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Détérioration Bois -- Effets du rayonnement ultraviolet Bois -- Teinture Essais accélérés (technologie) Essais dynamiques Lasures Photostabilisants Résistance à la traction Sapins Traitement chimique Index. décimale : 667.9 Revêtements et enduits Résumé : The depth profile of weathering effects on wood was studied after the laboratory ultraviolet exposure of fir-wood. The ‘thin strip’ method (ie the measurement of changes in tensile properties of microtomed wood sections) was modified in terms of exposure of batches of strips packed in bundles and exposed in a QUV apparatus. The bundles of strips were exposed untreated, covered with surface strips that had been impregnated with chromium (VI) trioxide or Fe(III) nitrate, or protected with free films of clear stain with photostabilisers and without photostabilisers. It has been shown that ultraviolet (UV) light penetrates the fir-wood surface to a depth greater than 70µm, resulting in changes in the tensile strength of the fir-wood strips to a depth of 70 to 140µm. Strength changes in lower levels (down to 280µm from the surface) could not be clearly attributed to a predominant effect of UV light, and were probably controlled by hydrolytic processes. 100 hours of exposure enabled the effectiveness of several treatments to be established. The clear stain, enriched with a UV absorber (Tinuvin 1130. Ciba) and a hindered amine light stabiliser (HALS compound type) (Tinuvin 292, Ciba), was shown to offer the best protection of the treatments studied. Impregnation with aqueous solutions of chromium (VI) trioxide and Fe(III) nitrate proved ineffective in photostabilising the wood surface. Note de contenu : - EXPERIMENTAL : Materials - Tensile strength measurements - MATERIALS AND SUPPLIERS : Chemical treatments - Preparation of free films of coatings - Composing the bundles of thin strips - Artificial weathering - Cutting of strips (or preparing the test specimens) - Table 1 : Composition of strip packs - Table 2 : The effect of a ferric nitrate and chromium oxide treatments on the tensile strength of thin fir-wood strips before and after UV-exposure in a QUV artificial weathering tester for 100 hours and 5OO hours DOI : 10.1007/BF02699671 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699671.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5443 [article]

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Photostabilisation : the key to robust, safe and elegant sunscreens / Eileen Zhang in SOFW JOURNAL, Vol. 145, N° 7/8 (07-08/2019)  

[article]  inSOFW JOURNAL > Vol. 145, N° 7/8 (07-08/2019) . - p. 18-25 Titre : Photostabilisation : the key to robust, safe and elegant sunscreens Type de document : texte imprimé Auteurs : Eileen Zhang, Auteur ; Hallstar (Chicago, USA), Auteur Année de publication : 2019 Article en page(s) : p. 18-25 Langues : Anglais (eng) Catégories : Antiâge Antioxydants Cosmétiques Formulation (Génie chimique) Peau -- Soins et hygiène Photostabilisants Produits antisolaires Protection cutanée Index. décimale : 668.5 Parfums et cosmétiques Résumé : During the photostabilisation process, the excited state energy of a light-absorbing species is removed by energy transfer and/or by an electron transfer quenching mechanism. By thus returning it to its ground state, this process stabilises light-absorbing species, which prevents photodegradation and the generation of reactive oxygen species (ROS). Hallstar has pioneered photostabilisation technology to promote effective sun protection and comprehensive photoaging prevention. Our photostabilisers for UV filters protect photolabile UV filters from decomposition and shield photosensitive UV filters from generating ROS. A paradigm shift from UV filter protection resulted in the development of our revolutionary anti-aging technology based on stopping photosensitisers in skin from generating any ROS when excited by light. Note de contenu : - Principles of photostabilisation - Protecting UV filters against photodecomposition : increase filter efficiency - Protecting UV filters against ROS generation : increase safety and effectiveness - Protecting skin chromophores against ROS generation : the ultimate solution to photoaging - Table 1 : Sunscreen formulation using AvoBrite - Table 2 : Sunscreen formulation without AvoBrite - Table 3 : Impact of Hallstar photostabilisers on mineral filter efficacy En ligne : https://drive.google.com/file/d/1_UICV7vXtKPm32QxMzu7rOAWXV09Y65Q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32930 [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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The efficiency of various treatments in protecting wood surfaces against weathering / V. Jirous-Rajkovic in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B1 (02/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B1 (02/2004) . - p. 15-19 Titre : The efficiency of various treatments in protecting wood surfaces against weathering Type de document : texte imprimé Auteurs : V. Jirous-Rajkovic, Auteur ; D. Radovan, Auteur ; A. Bogner, Auteur Année de publication : 2004 Article en page(s) : p. 15-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Détérioration Bois -- Revêtements protecteurs Bois -- Vernis Bois extérieurs Essais accélérés (technologie) Essais d'adhésion Lasures Nitrate de fer Photostabilisants Résistance aux conditions climatiques Revêtements organiques Stabilisant à la lumière de type amine encombrée Traitement chimique Index. décimale : 667.9 Revêtements et enduits Résumé : Wood exposed to the outdoors undergoes photo-oxidative degradation in a natural weathering process. The efficacy of various treatments for the protection of wood surfaces from weathering elements (ultraviolet radiation and water) was investigated by using the measurements of the changes in adhesion on fir and oak samples after their exposure to natural climatic conditions and after accelerated weathering. The most efficacious of the six UV-protective treatments proved to be the treatment of the wood surfaces with a semi-transparent stain, followed by treatments with a transparent wood stain containing two types of photostabilisers. The stabilisation of the wood surfaces by ferric nitrate did not improve the performance of the wood stain used. Note de contenu : - Wood samples - Chemical treatments - Coatings - Accelerated weathering - Natural weathering - Adhesion testing - Table 1 : Sample codes and description of the treatments - Table 2 : Mean adhesive strength (MPa) and standard deviations of samples after QUV exposure - Table 3 : Mean adhesive strength (MPa) and standard deviations of samples after natural exposure DOI : 10.1007/BF02699559 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699559.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5477 [article]

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