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[article]
Titre : The heart of the matter : Alternative ways to achieve low gloss and soft touch UV/EB coatings Type de document : texte imprimé Auteurs : Xavier Drujon, Auteur Année de publication : 2018 Article en page(s) : p. 20-26 Langues : Anglais (eng) Catégories : Agent mattant
Brillance (optique)
Copolymère uréthane acrylate
Diluants
Excimères
Lampes à excimère
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Revêtements anti-adhésifs -- Séchage sous rayonnement électronique
Revêtements anti-adhésion -- Séchage sous rayonnement ultraviolet
Rhéologie
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
Toucher softIndex. décimale : 667.9 Revêtements et enduits Résumé : It can be difficult to obtain matt finishes with 100% solids UV curable coatings. differents ways of achieving this are compared, including various matting silicas, polyamide ultrafine powders and the use of excimer pre-cure to produce a 'wrinkled' surface. Good results could be obtained but were highly dependent on formulation variables. Note de contenu : - Why 100% UV curable formulations are hard to matt
- Silica matting agents evaluated and compared
- Different diluents show large variations in rheology
- Polyamide matting agents show high efficiency
- Principles of matting by excimer pre-cure
- Practical evaluation of excimer pre-cure
- Effects of excimer on different monomers compared
- A range of options for matting
- TABLES : 1. Properties of silica matting agents - 2. Properties of selected reactive diluents - 3. Visual appearance of dispersion of silica mattings aids in reactive diluents : haziness, ranked from 1 = clear to 10 = white ; S = sedimentation after 24 hours, with assessment of their rheological behaviour in the same reactive diluents - 4. Properties of selected urethane acrylate - 5. Gloss comparison for various urethane acrylates with and without excimer pre-cure (applied at 10-8 µm on steel) - 6. Gloss comparison for UA1/HDDA, system with various cure conditions - 7. Properties of selected acrylate monomers - 8. Gloss and appearance for UA1/monomer formulations cured with excimer lamp
- FIGURES : 1. Viscosity at low shear rate (0.1 s-1) )Pa.s) for silica matting aids in reactive diluents - 2. Representation of rheological behaviour - 4. 3D surface imaging based on microscopic image of an excimer cured coating. Red areas are hills, and blue areas valleysEn ligne : https://drive.google.com/file/d/1A4qXwmTvRp1TpdipHnPzfeNeI0BWsLHQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30588
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 5 (05/2018) . - p. 20-26[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19900 - Périodique Bibliothèque principale Documentaires Disponible The lasting impact of titanium dioxide / Johan J. Rommens in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2020)
[article]
Titre : The lasting impact of titanium dioxide : A better understanding of how TiO2 affects powder-coat weathering Type de document : texte imprimé Auteurs : Johan J. Rommens, Auteur ; Steven de Backer, Auteur ; P. Gijsman, Auteur ; Leendert Molhoek, Auteur Année de publication : 2020 Article en page(s) : p. 30-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique)
Dioxyde de titane
Essais accélérés (technologie)
Polyesters
Résistance aux conditions climatiques
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements organiques
Revêtements poudreIndex. décimale : 667.9 Revêtements et enduits Résumé : Choosing the right method to evaluate weathering is important for the development of durable, high-quality coatings. Accelerated test methods often lead to the wrong conclusions. Note de contenu : - Titanium dioxide for durability
- Weathering tests indispensable
- Accelerated measurement of weathering resistance in paints
- Pathways to degradation
- Outdoors is best
- Accelerated is risky
- Experimental
- Influence of TiO2 on weathering resistance
- Comparison of accelerated weathering methods
- Don't jump to conclusions
- Understanding photo-degradation
- It's wetter in Florida
- More photolysis in Florida
- Rate of degradation initiation is key
- Table 1 : Weathering requirements according to GSB
- Fig. 1 : Gloss retention of powder coat after 1000 h Q-UVB exposure
- Fig. 2 : Gloss retention of powder coat after 1000 h WOM (xenon) exposure
- Fig. 3 : Gloss retention of powder coat after 5 years' Florida exposure
- Fig. 4a : Correlation between QUV-B exposure and Florida exposure (GSB "standard class"). GR = Gloss retention
- Fig. 4b : Scatterplot of QUV GR 600 hours vs Florida GR three years
- Fig. 5a : Correlation between WOM and Florida testing (class 1 qualicoat)
- Fig. 5b : Scatterplot of xenon GR 1000 hours vs Florida GR three years
- Fig. 6 : Measured (points) and calculated (lines loss of gloss as a function of time in TiO2-pigmented, Primie-445 crosslinked polyester powder coatings of variable isophthalic-terephthalic ester rations and weathered according to ASTM D7869, ISO 11341, ASTM G-53 and Florida
- Fig. 7 : Weight loss (wt. %) under lab conditions of water-saturated coatings 1 and H (6h at 40°C in liquid water)
- Fig. 8 : Measured and calculated of loss og gloss over time in Florida of a Primid XL552-crosslinked polyester powder coating (P800) containing different TiO2 types (calculated lines for C2, C3 and C10 as well as for C1 ; C7 and C6 overlap)
- Fig. 9 : k1 values calculated for the different TiO2 types, relative to the value of coatings made with C7En ligne : https://drive.google.com/file/d/1FyeVmJ63vHPjeZjkEtUOgZD2OdgjSd_c/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33920
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2020) . - p. 30-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21655 - Périodique Bibliothèque principale Documentaires Disponible The level of confidence in gloss measuring... / Nico Frankhuizen in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4601 (10/2014)
[article]
Titre : The level of confidence in gloss measuring... Type de document : texte imprimé Auteurs : Nico Frankhuizen, Auteur Année de publication : 2014 Article en page(s) : p. 26-27 Langues : Anglais (eng) Catégories : Brillance (optique)
Mesure
NormalisationIndex. décimale : 667.9 Revêtements et enduits Résumé : ISO has made the first step by renewing ISO2813. However, this solves just a part of the problem. The main issue is with the primary standard. All data are currently derived from just one reference, a quartz-glass wedge with no proof for the assumed linearity. Ideally a series of reliable reference materials would be developed and defined in order to prove and secure gloss references over a range of values rather than just one or two points. A series of references would also prove or disprove the assumed linearity of the calibration line. Thorough scientific research seems to be required to define the effects of roughness and wavelength in order to develop a primary-standard that puts ISO and ASTM in-line and that leaves no room for questions. Ideally these primary standards are of an accuracy level at least tenfold better than those of today's commercial glossmeters. Scientific research on a global definition of gloss would be of great use to the industry. All specifications on gloss should be checked for feasibility and correctness. Although gloss is a generally accepted appearance criteria for quality control in many indutries, recent revelations on gloss standards require us to rethink the way we consider the accuracy of our obtained results. Note de contenu : - But are these claims and specifications feasible ?
- Are these criteria realistic ?En ligne : https://drive.google.com/file/d/1ePt1yEhHqjtI7n89gVhrf5TYmmVBL_ze/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22144
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 204, N° 4601 (10/2014) . - p. 26-27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16585 - Périodique Bibliothèque principale Documentaires Disponible The level of confidence in gloss measuring / Nico Frankhuizen in PAINTINDIA, Vol. LXV, N° 2 (02/2015)
[article]
Titre : The level of confidence in gloss measuring Type de document : texte imprimé Auteurs : Nico Frankhuizen, Auteur Année de publication : 2015 Article en page(s) : p. 63-65 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique)
Mesure
Normalisation
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Esthetic properties are become increasingly important in today's industry. In the 2Oth century gloss measurements became a standard QC parameter when it comes to validate the esthetics of coated surfaces. Readings from glossmeters and tight gloss-criteria set in finishing specifications are these days leading appearance guidelines.
Coating manufacturers, QC-organizations and suppliers of-test-equipment as well specify or claim very tight boundaries for gloss levels. But are these claims and specifications feasible ?En ligne : https://drive.google.com/file/d/1qRqKWrkVXHFhhZ96L71RqbJ_uxDoZ0w0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23501
in PAINTINDIA > Vol. LXV, N° 2 (02/2015) . - p. 63-65[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17056 - Périodique Bibliothèque principale Documentaires Disponible The path to greater resistance / Abhishek Srivastava in EUROPEAN COATINGS JOURNAL (ECJ), N° 6 (06/2018)
[article]
Titre : The path to greater resistance : Effect of reactive diluents on UV-curable wood coating properties Type de document : texte imprimé Auteurs : Abhishek Srivastava, Auteur Année de publication : 2018 Article en page(s) : p. 26-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements
Brillance (optique)
Copolymère uréthane acrylate
Diluants
Essais dynamiques
Formulation (Génie chimique)
Mesure
Polyesters
Polymères -- Synthèse
Polyols
Polyuréthanes
Résistance à l'abrasion
Revêtements -- Propriétés chimiques
Revêtements -- Propriétés mécaniques
Revêtements -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : UV-curable polyurethane acrylate wood coatings were studied with the aim of enhancing protective and decorative properties. Adding reactive diluents may improve coating hardness, ease of application as well as resistance to abrasion and chemicals but it is a delicate balance. Incorporating too much of the diluents can cause micro-distortions on the surface, and brittleness - impairing gloss and scratch resistance. Note de contenu : - Experimental : Polyester polyol synthesis - Urethane acrylate synthesis - Polyurethane acrylate synthesis - Measurements - Preparation of coating samples - UV curing of samples - PU-acrylate resin analysis shows low molecular weight - Reactive diluents improve coating resistance - Scratch hardness
- Abrasion resistance
- Gloss at 60° angle
- Pencil hardness
- Cross hatch hardness
- Hydrocarbon chain in hdda results in better chemical resistance
- Excellent stain resistance
- Correct balance of reactive diluents enhances performance
- FIGURES : 1. Acid value of polyester polyol - 2. Hydroxyl value of a) polyester polyol and b) PU acrylate resin - 3. IR spectrum of the PU-acrylate resin - 4. Molecular weight of PU-acrylate resin
- TABLES : 1. Formulation of coating samples - 2. Viscosity and refractive index of coating samples - 3. IR spectrum of the PU-acrylate resin
En ligne : https://drive.google.com/file/d/1Bm5rZ9Ypm6YgAwLm2o53LpPBzIv1YWf9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30721
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 6 (06/2018) . - p. 26-32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20010 - Périodique Bibliothèque principale Documentaires Disponible The race for improved weathering / Matt Andersson in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2021)
PermalinkThe role of castor oil in epoxy and polyamide systems for coating and adhesive application / V. Shukla in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)
PermalinkThe solventless solution / Maria Almató in EUROPEAN COATINGS JOURNAL (ECJ), N° 07-08/2010 (07-08/2010)
PermalinkPermalinkTowards a practical metric of surface gloss for metallic coatings from automotive industry / Mengting Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
PermalinkTransparent UV-cured clay/UV-based nanocomposite coatings on wood substrates : surface roughness and effect of relative humidity on optical properties / William Nguegang Nkeuwa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 3 (05/2017)
PermalinkUltra-high-solid paints for industrial applications / Sascha Kollbeck in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 9, N° 2 (2016)
PermalinkUtilitarian and good looking / Steven Reinstadtler in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 203, N° 4589 (10/2013)
PermalinkVersatile self-crosslinking polyurethane dispersion for low VOC coatings across multiple markets / Aditi Chavannavar in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4645 (10/2018)
PermalinkVersatile self-crosslinking polyurethane dispersion for low VOC coatings across multiple markets / Aditi Chavannavar in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4646 (11/2018)
PermalinkWater-based energy curable polyurethane dispersion / Michel Tielemans in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4614 (11/2015)
PermalinkWater based gloss enamel using PRIMAL HG emulsions sustainable and safer alternative to solvent based enamel / Girish A. Bhagwat in PAINTINDIA, Vol. LXIV, N° 9 (09/2014)
PermalinkWaterborne hybrid (alkyd/styrene acrylic) emulsion polymers and exterior paint applications / Nurullah Kartaloglu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
PermalinkWaviness analysis of glossy surfaces based on deformation of a light source reflection / Jiri Filip in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
PermalinkWeather-stable low-gloss powder coatings / P. Thometzek in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 906 (07/2000)
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