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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]
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 organofonctionnelsIndex. 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32919
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 31-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21175 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : A cure for wood protection : water-based UV PUD finishes offer enhanced resistance properties Type de document : texte imprimé Auteurs : Laurie Morris, Auteur Année de publication : 2016 Article en page(s) : p. 18-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements protecteurs
Couleurs -- Stabilité
Essais accélérés (technologie)
Evaluation
Polymères en émulsion
Polyuréthanes
Réticulation (polymérisation)
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : Factory-applied exterior woodfinishes are often based on acrylic emulsions or polyurethane dispersions. UV curable PUDs were evaluated as alternatives. The best showed the required high flexibility combined with high surface hardness. Retention of wood colour in QUV testing was much better than that of the commercial clear coatings used as controls. Note de contenu : - Benefits and choice of UV cured coatings
- Chemistry of WB PUDS
- Limitations of traditional exterior wood coatings
- Initial evaluation of UV resin blends
- Physical test methods summarised
- How curing response was evaluated
- Artificial weathering test procedure
- Results of initial evaluation summarised
- Phase 2 tests carried out to industry standards
- Panel preparation and test procedures summarised
- Initial tests show very good results
- Exposure tests on-going to confirm good performanceEn ligne : https://drive.google.com/file/d/1BVlLZlxdx4nM8qCnzfpQk49WqH4T_BBb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26948
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 9 (09/2016) . - p. 18-23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18330 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Decorative and long-lasting : Hydro-2K-PU and hydro-UV coatings for outdoor applications Type de document : texte imprimé Auteurs : Stefan Friebel, Auteur Année de publication : 2023 Article en page(s) : p. 50-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Applications extérieures
Composites à fibres végétales
Essais accélérés (technologie)
Liants
Polyuréthanes
Revêtements bi-composant
Revêtements décoratifs
Revêtements en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : The coatability of commercial WPC and its behaviour in outdoor applications was investigated as part of an EU-funded research project. A long-term study of hydro-2K-PU/hydro-UV coatings (2K-PU/UV) and the influence of binder type, pigmentation and mechanical properties of the binder was carried out. Wood-polymer composites (WPC) with polyethylene (PE) and softwood fibres represent a group of materials for durable, decorative outdoor applications. Note de contenu : - Pre-treatment of WPC
- Water-based 2K-PU and UV lacquers
- Tests before weathering
- Double-bond conversion
- Results of natural weathering
- Hydro-2K-PU coatings after 84 months exposure
- UV coatings after 84 months exposure
- Table 1 : Physical characteristics of the binders investigated
- Table 2 : Conversion of double bonds in % by IR-spectroscopy at 812 cm-1 as a function of pigmentation
- Table 3 : Colour and gloss values of hydro-UV-1 and hydro-UV-2 as a function of weathering time and RAL colour shadeEn ligne : https://drive.google.com/file/d/1CUvz3DR-kjfPGLnwNG6LYAU1VQeyRSFU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38739
in EUROPEAN COATINGS JOURNAL (ECJ) > (01-02/2023) . - p. 50-54[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23833 - Périodique Bibliothèque principale Documentaires Disponible 23831 - Périodique Bibliothèque principale Documentaires Disponible 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]
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 chimiqueIndex. 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 hoursDOI : 10.1007/BF02699671 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699671.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5443
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B4 (12/2004) . - p. 241-247[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000718 - Périodique Bibliothèque principale Documentaires Disponible Design of pigment dispersants for high-performance applications / Andrew Shooter in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4644 (09/2018)
[article]
Titre : Design of pigment dispersants for high-performance applications Type de document : texte imprimé Auteurs : Andrew Shooter, Auteur ; Tom Annable, Auteur ; Stuart Richards Année de publication : 2018 Article en page(s) : p. 26-30 Langues : Anglais (eng) Catégories : Agents dispersants (chimie)
Anticorrosifs
Anticorrosion
Dioxyde de titane
Dispersions et suspensions
Epoxydes
Essais accélérés (technologie)
Essais de résilience
Oxyde de fer
Pigments inorganiques
Revêtements bi-composant
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : With increasing regulatory and environmental requirements, there is a drive towards developing water-based VOC free pigmented coating formulations with the same aesthetic properties as solvent-based systems. The pigment dispersant in addition to providing fast wetting and desirable colouristic effects will also impact the overall durability of the coating. Novel anchor groups have enabled us to design improved dispersants, which can be formulated into coatings with superior jetness and colour strength. These dispersants can reduce the particle size in much less time than conventional dispersants using less energy during the milling process while providing the required stability and compatibility in the coating formulation. In addition, through efficiency in design coupled with judicious selection of stabilising chains, the dispersant can be optimised to minimise its impact on water sensitivity and corrosion resistance.
After proving that these principles deliver superior dispersants on organic pigments and carbon black, our recent focus has been to deliver the same benefits on high end inorganic pigments for industrial applications, such as transparent iron oxides. In this paper, we will discuss these design principles and show how this has translated into superior performance in waterborne industrial coatings.Note de contenu : - Dispersion of transparent iron oxides
- Dispersion of titanium dioxide
- FIGURES : 1. Optimising the dosage of a dispersant and the relationship to flocculation - 2. Classification of dispersants - 3. Dispersion of high surface area carbon black pigment with SA dispersant - 4. Developing an effective MA dispersant and impact on millbase viscosity - 4A : Carbon black dispersion gloss and colour strength when let down into an industrial white base - 4B. Pigment yellow 42 gloss and colour strength when let down into an industrial white base - 5. SEM images of transparent iron oxides. Yellow iron oxide and red - 6. Millbase viscosity and particle size at different concentrations of transparent iron oxide - 7. Transparent iron oxide millbase viscosity and particle size at different loadings of dispersant - 8. Opacity of yellow iron oxide dispersions in an automotive clear coat vs milling time - 9. Particle size distributions of pigment dispersion during the milling process - 10. Relationship between particle size and opacity for yellow iron oxide dispersion - 11. Dispersion of TiO2 with MA dispersant vs competitive controls - 12. Performance of MA dispersant on TiO2 pigments - 13. Top : Corrosion testing of TiO2 dispersion in acrylic coating. Corrosion testing of titanium dioxide dispersion in 2K epoxy coatingEn ligne : https://drive.google.com/file/d/1LK7BYCe6RuKv0-sshcv8uZlAneuTPHTl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31021
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4644 (09/2018) . - p. 26-30[article]Réservation
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