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Evaluation and improvement of the oxidative stability of leather fatliquors / Yue Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
[article]
Titre : Evaluation and improvement of the oxidative stability of leather fatliquors Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Min Huang, Auteur ; Jiaqi Lv, Auteur ; Zeng Yunhang, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants
Essais accélérés (technologie)
Huiles et graisses
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fatliquor oxidation may give leather unpleasant odor, and excessive amounts of Cr(VI) and volatile organic compounds. The accurate evaluation and improvement of the oxidative stability of fatliquors are of great significance to high-quality leather manufacturing. We proposed a set of practical methods for evaluating the oxidative stability of fatliquors on the basis of oxidation induction time, change in iodine value (∆ IV), and change in acid value (∆ AV) under accelerated oxidation conditions (at 100 °C with 10 L/h of air). Oxidation induction time is a highly sensitive marker for quantifying the oxidative stability of fatliquors, and ∆ IV and ∆ AV that are low cost and easy to operate are useful in evaluating the oxidative stability of fatliquors when the oxidation induction time is less than 22 h. The number of double bonds in fatliquors is an important factor affecting oxidative stability. The sulfation modification of fatliquors that greatly reduces double bonds and the addition of antioxidants, especially butylated hydroxyanisole and butylated hydroxytoluene, markedly improve oxidative stability of fatliquors. Note de contenu : - MATERIALS AND METHODS : Materials - Accelerated oxidation tests for fatliquors - Attenuated total reflection Fourier transform infrared spectrum of modified rape oils - Accelerated oxidation tests for modified rape oils - Accelerated oxidation tests for sulfated rape oil with antioxidants
- RESULTS AND DISCUSSION : Establishment of methods for evaluating the oxidative stability of fatliquors - Effect of modification method on the oxidative stability of fatliquors - Effect of antioxidant on the oxidative stability of fatliquorsDOI : https://doi.org/10.1186/s42825-021-00070-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00070-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37554
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p.[article]Evaluation method of the resistance of adhesives / Elisabeth Stammen in ADHESION - ADHESIVES + SEALANTS, Vol. 14, N° 2/2017 (2017)
[article]
Titre : Evaluation method of the resistance of adhesives Type de document : texte imprimé Auteurs : Elisabeth Stammen, Auteur ; Frauke Bunzel, Auteur ; Klaus Dilger, Auteur Année de publication : 2017 Article en page(s) : p. 14-19 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Adhésifs -- Détérioration
Epoxydes
Essais accélérés (technologie)
Evaluation
Oxydation thermique
Polyacrylates
Polyacryliques
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Rubans adhésifs
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
ThermogravimétrieIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : The aging behavior of adhesive polymers due to the influence of temperature and oxygen varies depending on their chemical base. DSC methods could replace long-term aging tests in the optimization of adhesive systems and would accelerate the validation processes. Note de contenu : - Aging by thermal oxidative degradation processes
- Analytical methods
- Methods in comparison
- Examples of selected adhesives tapes
- TABLES : Onset temperatures of the TGA of a stabilized and non-stabilized acrylate adhesive - 2. Onset temperatures from OOT measurements for epoxy A, B and C
- FIGURES : 1. Schematic diagram of OOT method - 2. Schematic diagram of the OIT method - 3. TGA of a non-stabilized and a stabilized acrylate adhesive for three different heating rates - 4. OIT measurements for a stabilized and non-stabilized acrylic adhesive at various temperatures (green/brown 190°C, violet/blue 180°C, black/red 170°C - 5. Comparison of the determined resistance of an acrylate adhesive from OOT and OIT measurements as well as furnace aging at different temperatures - 6. Comparison of the determined resistance of two silicones from OOT measurements as well as the furnace aging at different temperatures. Silicone 1 is not stabilized, silicone 2 is stabilized - 7. TGA of the investigated epoxides A, B and C - 8. OOT measurements for several heating rates for epoxy adhesive A - 9. Comparison of the determined resistance by means of OOT and furnace aging at 90°C for epoxy A,B and CPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28693
in ADHESION - ADHESIVES + SEALANTS > Vol. 14, N° 2/2017 (2017) . - p. 14-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19013 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of glass bubbles for solar heat reflection in waterborne acrylic elastomeric roof coatings / Kevin Rink in COATINGS TECH, Vol. 13, N° 9 (09/2016)
[article]
Titre : Evaluation of glass bubbles for solar heat reflection in waterborne acrylic elastomeric roof coatings Type de document : texte imprimé Auteurs : Kevin Rink, Auteur ; Andrea Charif Rodriguez, Auteur Année de publication : 2016 Article en page(s) : p. 40-48 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux)
Chlorure de polyvinyle
Economies d'énergie
Elastomères
Essais accélérés (technologie)
Formulation (Génie chimique)
Polyacryliques
Réflectivité thermique
Revêtements:Peinture
Sphères creuses
VerreIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, all of the white paints generally exhibit industry acceptable initial solar reflectance index values,2 and thus offer varying degrees of potential savings over a black roof baseline. Paints made with glass bubbles offered the highest degree of potential energy savings based on the fillers studied in this experiment. This study does not take into account the other parameters that qualify an acceptable elastomeric roof coating such as elongation, water resistance, etc. Final formulations need to be tested for ail specified properties to determine final acceptante per customer specifications. New studies have suggested maintaining certain minimum SRI values after actual outdoor weathering intervals. These and other studies such as the impact of glass bubbles on the solar reflectance of colored paints may form the basis for future studies. The white elastomeric paints in this study target low sloped roofs such as those utilized in industrial applications. Higher sloped roofs using other colors for residential applications could potentially benefit from these same materials.
White elastomeric waterborne acrylic roof coatings made with glass bubbles can offer formulators an alternative to other conventional fillers used in these coatings. The smaller glass bubbles offer increased solar reflectance and thermal advantages, which in turn could result in energy savings. The smaller bubbles also offer higher strength which could be beneficial for higher pressure applications such as airless spraying. In addition, the smaller bubbles yield a smoother appearance and good dirt pick-up resistance. The magnitude of these benefits needs to be evaluated by each formulator for their particular application and formulation.Note de contenu : - Opacity, gloss, and thickness
- Solar reflectance
- Thermal emittance test
- Infrared heat lamp test
- GB3 loading (PVC) study
- Accelerated weathering studies
- Additional experiment : using glass bubbles as a post-addition additive
- Energy savingsEn ligne : https://drive.google.com/file/d/1wrJfZjtAQkhR7SxdqkAdAKT6xNW9AyET/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27048
in COATINGS TECH > Vol. 13, N° 9 (09/2016) . - p. 40-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18377 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I / Kurt Wood in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I Type de document : texte imprimé Auteurs : Kurt Wood, Auteur Année de publication : 2018 Article en page(s) : p. 933-943 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique)
Dioxyde de titane
Durée de vie (Ingénierie)
Essais (technologie)
Essais accélérés (technologie)
Evaluation
Lampe au xénon
Polyfluorure de vinylidène
Prévision, Théorie de la
Résistance aux conditions climatiques
Revêtements -- Effets du climat:Peinture -- Effets du climat
Revêtements -- Normes:Peinture -- Normes
Revêtements en bâtiment:Peinture en bâtimentIndex. décimale : 667.9 Revêtements et enduits Résumé : A recently developed xenon arc-based accelerated weathering cycle, ASTM D7869-13, has been validated for automotive and aerospace coatings, but its ability to predict the gloss and color retention of premium architectural finishes has not yet been evaluated. We review new weathering data comparing the performance of poly(vinylidene fluoride) (PVDF) architectural finishes in south Florida exposure as well as several accelerated exposure methods including ASTM D7869-13. ASTM D7869 accurately reproduced Florida rank order gloss and color retention trends for coatings made with PVDF-acrylic blends and inorganic pigments, as well as the gloss and color changes seen in Florida for 70% PVDF masstone coatings made with a number of single organic pigments. However, the D7869 cycle has difficulty predicting the rank order of rutile TiO2 grades for the gloss retention of PVDF coatings in Florida, as well as the magnitude and direction of color fade from organic pigment degradation in organic pigment/inorganic pigment blends. One open question that remains is whether the ASTM D7869 cycle might have some utility for industry standard or specification purposes, if the test is limited to specific reference colors or more ideally to specific reference pigments. Note de contenu : - Experimental
- Evaluation of ASTM D7869-13 for PVDF coatings with weatherable inorganic pigments
- Evaluation of ASTM D7869-13 for PVDF coatings with TiO2
- Evaluation of ASTM D7869-13 for PVDF coatings with organic pigmentsDOI : 10.1007/s11998-017-0050-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0050-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31118
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 933-943[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of the atmospheric corrosion resistance of AISI A-36 steel painted with coatings based on epoxy and poly(urethane) resins using semi-accelerated testing / E. M. Oliveira in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 2 (06/2009)
[article]
Titre : Evaluation of the atmospheric corrosion resistance of AISI A-36 steel painted with coatings based on epoxy and poly(urethane) resins using semi-accelerated testing Type de document : texte imprimé Auteurs : E. M. Oliveira, Auteur ; J. R. G. Carneiro, Auteur ; V. F. Cunha Lins, Auteur Année de publication : 2009 Article en page(s) : p. 213-219 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Corrosion
Epoxydes
Essais accélérés (technologie)
Métaux -- Revêtements protecteurs
Polyuréthanes
Revêtements
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : The influence of temperature, humidity, salinity, and the number of wet-dry cycles in the atmospheric corrosion resistance of the AISI A-36 steel, painted with coatings based on epoxy and poly(urethane) resins was studied. The aim of this work is to present an alternative to the accelerated and field tests developing a semi-accelerated test for evaluating the resistance and durability of a protection system that is applied to a specific environment for one year. The samples were exposed in a corrosion cyclic test chamber for 2000 h with fixed parameters of temperature, relative moisture of air, salinity, and a number of dry-wet cycles. Mass loss of substrate in the scratch area was measured after each 250 h of testing. The second stage of research was the sensibility analysis of the corrosion rate with the change of the reference test parameters. The third stage was the testing of the samples using the cyclic test for 750 h, and the transfer of samples to a marine atmosphere exposure for one year. The mass loss was measured after each 60-day period of testing. Material characterization involved scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and X-ray fluorescence spectroscopy. After polynomial adjustment of the mass loss function associated with the sensibility analysis of the parameter alteration, the estimated life span of the samples ranged from 30 to 38 months. DOI : 10.1007/s11998-008-9135-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9135-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5606
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 2 (06/2009) . - p. 213-219[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011361 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of the weathering resistance of waterborne acrylic- and alkyd-based coatings containing HALS, UV absorber, and bark extracts on wood surfaces / Özlem Özgenç in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
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PermalinkExperimental and theoretical behavior of exterior wood coatings subjected to artificial weathering / Jan van den Bulcke in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 2 (06/2008)
PermalinkExposure studies of exterior house paints containing kaolin clay pigments / Thad T. Broome in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 874 (11/1997)
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PermalinkFatigue behavior and climatic cycle testing of large bonded attachments / Ivo Drisga in ADHESION - ADHESIVES + SEALANTS, Vol. 15, N° 3/2018 (2018)
PermalinkFiabilité des matériaux polymères en plasticulture / J. Lemaire in CAOUTCHOUCS & PLASTIQUES, N° 797 (09/2001)
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