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Determining rheological behaviour of paints, iks and coatings / Oliver Sack in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 20-21 Titre : Determining rheological behaviour of paints, iks and coatings Type de document : texte imprimé Auteurs : Oliver Sack, Auteur ; Anton Paar, Auteur Année de publication : 2019 Article en page(s) : p. 20-21 Langues : Anglais (eng) Catégories : Encre Revêtements organiques Revêtements:Peinture Rhéologie Rhéomètres Tags : Rhéomètre  'Expériences  de  rotation'  oscillatoires'  'Balayage  d'amplitude'  'Décomposition  structurelle'  'Reprise  structurelle''Test  temps  à  3  intervalles' Index. décimale : 667.9 Revêtements et enduits Résumé : Understanding rheological properties of paints, inks and coatings is of great importance for many industrial applications, such as manufacturing, processing and curing/hardening. Simple rotational experiments like shear stress-(CS) and shear rate (CR) controlled tests give only information about the viscosity value, the "seeming" yield point and the thixotropic effect. Since it is known for many years, that these values are not sufficient to describe the complex visco-elastic properties of paints, the use of more sensitive rheometers is recommended fora better understanding of the rheological characterisation. Modern air bearing-based rheometers provide the possibility to perform rotational tests, as well as oscillatory shear measurements. Measurements which are carried out under oscillatory shear conditions, provide advantages for characterising liquid and cured (film) paints and coatings. In addition, the curing or hardening process can be investigated and the glass transition point (Tg) can be determined. The most common used oscillatory experiments are the amplitude sweep (AS), frequency sweep (FS) and the structural recovery test (31TT). While the AS is used to determine the yield/flow point and the structural strength, the FS provides information about the sedimentation stability of the material. 31TT-tests are used to describe the levelling and sagging behaviour after the application process, as well as the thixotropic effect (time dependent structural recovery). Curing and hardening processes can not only be performed time and temperature controlled but also under UV exposure. For this reason, an air bearing-based rheometer is essential to avoid any shear influences to the 3-dimensional structures that corne up during the curing process. Compared to a viscometer, a modern rheometer system can be used fora full rheological characterisation of paints, inks and coatings.The generated data provide a deeper view inside the structure of the materials and help to understand and improve the manufacturing process and applicational problems. Note de contenu : - Rotational experiments - state of the art - Oscillatory experiments - modern methods - Structural decomposition and regeneration - Fig. 1 : Silver 3 (organoclay), silver 1 (acrylic thickener) and silver 3 (polyurethane thickener) - Fig. 2 : Shows the viscosity curves of the three different paints. Over the shear rate range between 0.1 to 10005-1 the samples show much higher viscosity values compared to lower shear rates - Fig. 3 : Amplitude sweeps of the three different silver coatings - Fig. 4 : 3-Interval-Time-Tests (3ITT) of three different silver coatings En ligne : https://drive.google.com/file/d/12NXSuASvepHIkB7w7qqmvK3o3ZKW9Sxy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32917 [article]

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Factors influencing the interlayer adhesion in the CED primer/waterborne coating system / Natalia Vlasova in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 29-30 Titre : Factors influencing the interlayer adhesion in the CED primer/waterborne coating system Type de document : texte imprimé Auteurs : Natalia Vlasova, Auteur ; Valentina Miloslavskaya, Auteur ; Larisa Sakharova, Auteur ; Viktor Ozhiganov, Auteur ; Evgenii Indeikin, Auteur Année de publication : 2019 Article en page(s) : p. 29-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Anticorrosifs Anticorrosion Copolymère mélamine-formaldéhyde Copolymère uréthane époxy Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Polyesters Primaire (revêtement) Réticulants Revêtements en phase aqueuse -- Additifs Revêtements protecteurs Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : The authors discusses a study of an epoxy urethane cathodic electrodeposition primer and polyester melamine paint, containing melamine-formaldehyde cross-linking agents with different alkylation degrees and types, as well as an acid catalyst for acceleration of the curing process. Among the broad variety of anticorrosion coatings, cathodic electrodeposition (CED) primers have an undeniable superiority. Such primers are overcoated with weather resistant coatings to obtain weatherability and the necessary decorative properties. From the point of view of environmental safety and fire protection, waterborne stoving paints are of the highest interest, however, there is a risk of interlayer adhesion failure due to the primer layer over-drying. In the present work, epoxy urethane cathodic electrodeposition primer and polyester melamine paint, containing melamine-formaldehyde cross-linking agents with different alkylation degrees and types as well as an acid catalyst for acceleration of the curing process have been studied. The physical and chemical factors influencing the interlayer adhesion in the system consisting of epoxy urethane CED primer and polyester melamine waterborne stoving paint have been investigated and conditions under which a complete interlayer adhesion failure occurs have been determined. Note de contenu : - Materials and methods - Waterborne coating crosslinking rate and degree - CED primer/waterborne coating interlayer adhesion - Interfacial energy properties - Fig. 1 : Storage modulus vs time for the curing of the coatings with PMMM - 1 ; HMMM without a catalyst - 2 ; HMMM with 0.3%p-TSA - 3 and the temperature curve - 4 - Fig. 2 : Intertayer adhesion of the waterborne coating with PMMM (1) HMMM without the catalyst (2), HMMM with 0.3%p-TSA(3)to CED primer cured at 165°C for 15min. (a), at 165°C for 30min (b), at 180°C for 15min (c), at 180°C for 30min (d) - Table 1 : Polyester coating MEK resistance - Table 2 : MEK-resistance of CED primers - Table 3 : Interlayer adhesion for different CED primer/waterborne coating systems - Table 4 : Specific surface energy and its components for the CED primer surfaces - Table 5 : Surface tension for liquid waterborne coatings - Table 6 : Interfacial tension between the CED primer and the waterborne coating En ligne : https://drive.google.com/file/d/1EcybHljC3XOLsbF72p-bKBBpL1FHz8gY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32918 [article]

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Crosslinking waterborne coatings with bipodal silanes for improved corrosion protection performance / Jacob D. Shevrin in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 31-36 Titre : Crosslinking waterborne coatings with bipodal silanes for improved corrosion protection performance Type de document : texte imprimé Auteurs : Jacob D. Shevrin, Auteur ; Sheba D. Bergman, Auteur Année de publication : 2019 Article en page(s) : p. 31-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Essais accélérés (technologie) Formulation (Génie chimique) Métaux -- Revêtements protecteurs Réticulation (polymérisation) Revêtements en phase aqueuse -- Additifs Silanes organofonctionnels Index. décimale : 667.9 Revêtements et enduits Résumé : The authors discusses waterborne silane technology and its impact on corrosion resistance properties in a coating. As waterborne silane technology continues to gain interest as an environmentally friendly alternative to well-established corrosion protection technology, investigations into performance-enhancing additives are crucial for supporting this market growth. If can be concluded that organofunctional bipodal silanes are viable performance-enhancing additives in waterborne corrosion protection systems due to the increase in hydrophobicity, crosslinking density and surface passivation that these materials can provide. ln particular, the waterborne organofunctional silanol system with colloidal silica and organofunctional bipodal silane additives exhibited the best corrosion resistance in neutral salt spray testing, the best alkaline resistance in alkaline testing, and the highest impedance during EIS testing. However, it is important to note that adding in an organofunctional bipodal silane into a room temperature cured waterborne organofunctional silanol coating did not outperform a thermally cured waterborne organofunctional silanol coating without organofunctional bipodal silane additives. The authors discusses waterborne silane technology and its impact on corrosion resistance properties in a coating. While contact angle measurements, salt spray testing, alkaline resistance testing and EIS data support this claim of increased corrosion resistance with the use of organofunctional bipodal silane additives, further research is necessary to understand the complete scope of waterborne silane technology and its interactions with organofunctional bipodal silanes. Additional experimentation, including outdoor weatherability testing in real life conditions, is underway to better understand this technology in the hope of further improving the performance, affordability and reliability of waterborne silane coatings for corrosion resistance applications. Note de contenu : - EXPERIMENTAL METHODS : Materials - Formulation preparation - Cleaning and application procedures - Testing procedures - RESULTS AND DISCUSSION : Surface contact angle analysis - Neutral salt spray testing - Alkaline resistance testing - Electrochemical impedance spectroscopy. - Table : Ingredients for waterborne coatings WB1-WB5 (weight in grams) En ligne : https://drive.google.com/file/d/1T8G1vYU9OkeErtzSNwIsLN49qBs9CldH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32919 [article]

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Improving the performance of protective water-based coatings / Ian Martin in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 15-16 Titre : Improving the performance of protective water-based coatings Type de document : texte imprimé Auteurs : Ian Martin, Auteur Année de publication : 2019 Article en page(s) : p. 15-16 Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Polyuréthanes Résistance aux conditions climatiques Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : The author discusses an essential additive that ensures waterborne coatings will perform exceptionally in exposed applications. Note de contenu : - Polyurethane dispersions-based coatings - Curing or drying ? - Performance without the cost - Figure : Reduction in colour change during 2000hr QUVB exposure En ligne : https://drive.google.com/file/d/1sggTo4IMns9vfUvbfes7eu7d_ywIIXUD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32920 [article]

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Polymer Paint Colour Journal Vol. 209, N° 4654 URL