Attributing the crosslinking density to water vapor transmission rate of an acrylic-melamine automotive clearcoat / M. Nasirzadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 239-246 Titre : Attributing the crosslinking density to water vapor transmission rate of an acrylic-melamine automotive clearcoat Type de document : texte imprimé Auteurs : M. Nasirzadeh, Auteur ; H. Yahyaei, Auteur ; S. M. Lashgari, Auteur ; Mohsen Mohseni, Auteur Année de publication : 2021 Article en page(s) : p. 239-246 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Angle de contact Caractérisation Copolymère acrylique mélamine Densité Dureté (matériaux) Formulation (Génie chimique) Résistance chimique Réticulation (polymérisation) Transmission de vapeur d'humidité Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the effect of crosslinking density of an acrylic-melamine clearcoat on water vapor transmission rate was evaluated. Four types of acrylic resins with different OH contents were used as the main polymeric backbone of the acrylic-melamine clearcoat. Also, three different acrylics to melamine–formaldehyde ratios were used in the coating formulations to obtain various crosslinking densities. It was observed that other film properties such as surface hydrophilicity and molecular homogeneity had a crucial impact on the clearcoat water vapor transmission rate together with the crosslinking density. Surprisingly, results showed that samples with acrylic resin with less OH content and lower melamine–formaldehyde crosslinker had the lowest water vapor transmission rate among other samples. These results were in agreement with the water contact angle and the data deduced from dynamic mechanical thermal analysis (DMTA) results of clearcoats. Note de contenu : - EXPERIMENTAL : Materials - Preparation of acrylic-melamine clearcoat - CHARACTERIZATION - RESULTS AND DISCUSSION - WATER CONTACT ANGLE : ATR-FTIR results - Solvent resistance - The hardness of the clearcoats - Dynamic mechanical thermal properties (DMTA) - Water vapor transmission rate - Table 1 : The composition of clearcoats - Table 2 : Water contact angle with clearcoats (degree) - Table 3 : The hardness results (with standard deviation) of the clearcoats - Table 4 : The crosslink density of the clearcoats calculated with storage modulus in rubber plateau - Table 5 : The homogenity data obtained from loss tangent graphs - Table 6 : Water vapor transmission, grams per square meter per 24h DOI : https://doi.org/10.1007/s11998-020-00400-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00400-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35366 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
22605	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Changing industry dynamics towards eco high solid coatings and lean process friendly in PAINTINDIA, Vol. LXX, N° 10 (10/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 10 (10/2020) . - p. 66-78 Titre : Changing industry dynamics towards eco high solid coatings and lean process friendly Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 66-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés organiques volatils Copolymère acrylique mélamine Haut extrait sec Humide sur humide (revêtements) Polyuréthanes Primaire (revêtement) Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Rhéologie Vernis bi-composant Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The automotive industry has undergone incredible changes by ways of material and process development. Different driving forces behind the development of better and more efficient process have brought dramatic changes over last 100 years. Number of applied coatings layers has been reduced to 3 layers. The latest development of wet on wet coating technology coating machines automatic cleaning process the time taken for the body painting reduced to 8 hr. Emission of volatile organic compounds (VOC) is main problem for coating industry considering the fact increase in the solid content which increase covering capacity of coating and decrease in solvent content in solvent borne formula is implemented the relative increase of solid by 20% generated completely new technology i.e. High solid technology. Note de contenu : - VOC REDUCTION DATA FROM YEAR 1965 TO 2005 - THREE COAT SYSTE IN AUTOMOTIVE FIELD : Primer - Three technologies have now been established - TECHNOLOGICAL REQUIREMENTS : Film properties - Mechanical properties - Liquid primers - Powder primer - Top coats - Pigments and color - Single-stage top coats (monocoats) - Base coats - Base coat rheology - Low and medium solids base coat - High solids (HS) base coats - Waterborne base coats - Global conversion to waterborne base coat technology - Clear coat - Liquid clear coats - One-component (1K) acrylic melamine clear coat - Two-component (2K) polyurethane clear coat - Waterborne clear coat - Powder clear coat - Following other advantages - PROCESS COMPARISON En ligne : https://drive.google.com/file/d/10BTHrLl6X0Z6gwpZ_Rld_DzeG6vpSalj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34669 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
22360	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Control of functional site location for thermosetting latexes / Mark D. Soucek in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 1 (03/2009) . - p. 27-36 Titre : Control of functional site location for thermosetting latexes Type de document : texte imprimé Auteurs : Mark D. Soucek, Auteur ; E. Pedraza, Auteur Année de publication : 2009 Article en page(s) : p. 27-36 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aminoplastes Copolymère acrylique mélamine Latex Rhéologie Thermodurcissables Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Résumé : The location of hydroxyl functionality was investigated for thermosetting acrylic latexes. Large and small latex particles with and without hydroxyl functionality were also synthesized and characterized. Large and small latex particles with and without hydroxyl functionality were blended together, and the latexes were crosslinked. The location of hydroxyl groups in the small or large latex particles had an effect upon the thermomechanical properties and hence on the ultimate performance of the crosslinked latexes. The packing of the large and small latexes was dependent on small-to-large particle ratio, and in addition had an effect upon the speed of film formation. The higher concentration of hydroxyl groups in the small latex particles contributed more to the tensile properties of the latexes than the functionality of the large particles. DOI : 10.1007/s11998-008-9099-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9099-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4842 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011246	-	Périodique	Bibliothèque principale	Documentaires	Disponible
011271	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Effects of different silicon-based surface active additives on degradability of clearcoats exposed to bird dropping / Bahram Ramezanzadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 4 (07/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 4 (07/2014) . - p. 533-543 Titre : Effects of different silicon-based surface active additives on degradability of clearcoats exposed to bird dropping Type de document : texte imprimé Auteurs : Bahram Ramezanzadeh, Auteur ; Mohsen Mohseni, Auteur ; N. Naseh, Auteur Année de publication : 2014 Article en page(s) : p. 533-543 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Angle de contact Automobiles -- Vernis Copolymère acrylique mélamine Copolymère silicone acrylate Déjections d'oiseaux Fourier, Spectroscopie infrarouge à transformée de Microscopie à force atomique Microscopie électronique à balayage Pancréatine Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Résistance chimique Vernis -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : A series of clearcoats separately loaded with different concentrations of functional silicon–polyacrylate and polydimethyl siloxane additives were prepared. Optical performances of the cured films were studied by gonio-spectrophotometry. Dynamic mechanical thermal analysis was used in order to investigate viscoelastic properties of the additive-containing films. Contact angle measurements, (FTIR) spectroscopy, scanning electron microscopy equipped with energy-dispersive analysis of X-ray, and atomic force microscopy techniques were utilized to evaluate surface properties of the clearcoats. It was shown that clearcoat surface free energy decreased and its crosslinking density increased in the presence of the additives. Results revealed that addition of both additives to the clearcoat enhanced its resistance against pancreatin (simulated bird droppings). A decrease in surface degradation was observed in the presence of the additives. Results also showed that functional polydimethyl siloxane influenced coating viscoelastic, surface chemistry, and biological resistance more effectively compared to that of the functional silicon–polyacrylate one. Note de contenu : - EXPERIMENTAL : Materials and sample preparation - Testing methods - RESULTS AND DISCUSSION : Appearance of the clearcoats loaded with additives - FTIR studies - DMTA analysis - Surface analysis DOI : 10.1007/s11998-014-9572-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9572-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21714 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16424	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Hygrothermal stress evolution during weathering in organic coatings / Dan Y. Perera in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 833 (06/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 833 (06/1994) . - p. 83-88 Titre : Hygrothermal stress evolution during weathering in organic coatings Type de document : texte imprimé Auteurs : Dan Y. Perera, Auteur ; Maarten Oosterbroek, Auteur Année de publication : 1994 Article en page(s) : p. 83-88 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contraintes (mécanique) Copolymère acrylique mélamine Copolymère uréthane acrylique Essais accélérés (technologie) Relaxation des contraintes Vernis -- Effets du climat Index. décimale : 667.9 Revêtements et enduits Résumé : Hygrothermal stresses developing in two clearcoats exposed to two types of accelerated weathering were determined. The physical and chemical changes induced by weathering produce a continuous increase of tensile and compressive stresses which ultimately causes it to crack. It was found that the stress magnitude and the duration of exposure at which the coating cracks depend on the type of the accelerated weathering. Also, the rate of stress relaxation decreases with duration of weathering. However, the shape of curves describing the stress dependence on duration of weathering is the same provided that the main mechanism of coating degradation does not change. When combined with other techniques, the measurement of stress appears to be an important way of studying coating durability (...) Note de contenu : - EXPERIMENTAL: Materials - Accelerated Wheathering - Methods - RESULTS : Physical aging - Type of accelerated Wheathering - Stress relaxation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18652 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
003467	-	Périodique	Bibliothèque principale	Documentaires	Disponible
003480	-	Périodique	Bibliothèque principale	Documentaires	Exclu du prêt

Improved durability through reactive dispersant technology / Steffen Onclin in COATINGS TECH, Vol. 15, N° 7 (07/2018)  

Permalink

Not your same old polymers / Bernd Göbelt in COATINGS TECH, Vol. 3, N° 9 (09/2006)  

Permalink

---

1 (1 - 7 / 7)