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

[article]  inCOATINGS TECH > Vol. 15, N° 7 (07/2018) . - p. 22-33 Titre : Improved durability through reactive dispersant technology Type de document : texte imprimé Auteurs : Steffen Onclin, Auteur ; Kou Huiguang, Auteur ; Rainer Diehl ; Elena Martinez ; Clemens Auschra ; Andrew Recker ; Anthony Moy Année de publication : 2018 Article en page(s) : p. 22-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie) Copolymère acrylique mélamine Copolymères séquencés Essai de dureté Essais dynamiques Granulométrie Noir de carbone Pâte pigmentaire Pigments Polymères à terminaison hydroxyle Polyuréthanes Revêtements -- Additifs:Peinture -- Additifs Rhéologie Vernis bi-composant Vernis en phase aqueuse Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Even though formulation additives comprise only a minor part of a coating formulation, they can have pronounced effects on the physical properties of the final coating. This is especially true for pigment dispersants, which can enter a coating formulation “under the radar” through, for example, pigment pastes.  As dispersants are often polar polymers with a low glass transition temperature, the interface between the pigment and continuous phase forms a weak point, especially in coatings designed for high durability. This article addresses the development of an improved dispersant technology. The dispersants are functionalized such that they become part of the continuous phase of the coating, improving overall film integrity. Application examples, in both waterborne and solventborne formulations, demonstrate the effects of reactive technology on mechanical and barrier properties in comparison to conventional systems. Note de contenu : - Effect of dispersants on coatings properties - Dispersant with new anchoring chemistry - Reducing negative impact of dispersants on coating properties - Towards waterborne reactive dispersants - Fig. 1 : Stabilization mechanisms of dispersants - Fig. 2 : Effect of exchanging part of grinding resin with dedicated dispersant (internal BM 1) on pigment paste rheology and transparecy in a solventborne MS OEM system. Values in brackets reflect dispersant dosage (active dispersant on pigment) - Fig. 3 : Pendulum hardness and MEK-rub test results of a solventborne MS-OEM basecoat after the addition of 20% pigment paste. Values in brackets reflect dispersant dosage (active dispersant on pigment). MEK-rubs were performed directly on the basecoat - Fig. 4 : Mill base viscosities, fresh and after two weeks at 50°C, as a function of dispersant dosage. Pigment pastes are resin-free and contain 13% carbon-black - Fig. 5 : Average particle size of pigment pastes as function of dispersant dosage. Particle size measurements were performed two days after pigment paste preparation - Fig. 6 : Schematic representation of working principle of analytical ultra-centrifuge - Fig. 7 : Dispersant adsorption in a solventborne, resin-free carbon black pigment paste, measured with an anlytical ultra-centrifuge. Effective (measured) dispersant on pigment is plotted againsf formulated dispersant on pigment - Fig. 8 : Jetness and undertone values in a medium-solids OEM basecoat. Coatings were applied on a glass substrate and measurements wre taker from the backside (through the glass) to reduce surface effects - Fig. 9 : Jetness and undertone values in a 2KPU topcoat. Coatings were applied on a glass substrate and measurements were taken from the backside (though the glass) to reduce surface effects - Fig. 10 : Schematic representation of co-reactive dispersant concept. The dispersant becomes part of the continuous resin phase to improve film integrity - Fig. 11 : Pendulum hardness and MEK-rub resistance of an MS-OEM basecoat. The MEK-rub test was performed directly on the basecoat - Fig. 12 : Pendulum hardness and chemical resistance of a 2KPU topcoat, containing 20% pigment paste. Chemical resistance after 16h exposure. Chemical resistance rating : 5 = no change, 1 = strong change/damage - Fig. 13 : Functionalization of block copolymer dispersants with hydroxyl-functional groups - Fig. 14 : Pigment paste rheology (fresh) of resin-free pigment concentrates containing 18% PBk 7 and a DOP level of 100%. Jetness and undertone in a WB 1K acrylic melamine topcoat, applied on glass, after mixing with 20% pigment paste. Measurements were taken from the backside (though the glass) - Fig. 15 : Pendulum hardness of WB 1K acrylic melamine topcoat containing 20% of carbon black pigment paste - Fig. 16 : Chemical resistance of a 1k acrylic melamine topcoat, containing 20% pigment paste. Data after 16h exposure. Chemical resistance rating : 5 = no change, 1 = strong change/damage En ligne : https://drive.google.com/file/d/1CDNJI6SBFF_mE-AMpYjliE_s5klSpHDp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31209 [article]

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New water-based binder for durable thin film intumescent coatings / Alan Fream in COATINGS TECH, Vol. 15, N° 7 (07/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 7 (07/2018) . - p. 34-42 Titre : New water-based binder for durable thin film intumescent coatings Type de document : texte imprimé Auteurs : Alan Fream, Auteur ; Christophe Baude, Auteur ; Maurille Secher, Auteur Année de publication : 2018 Article en page(s) : p. 34-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier de construction Couches minces Essais de comportement au feu Formulation (Génie chimique) Intumescence (chimie) Liants Métaux -- Revêtements protecteurs Revêtements en phase aqueuse -- Additifs Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : In recent years, thin film intumescent coatings have become the preferred choice for the protection of structural steel. This is a result of their ability to provide a cost-effective passive fire protection solution while maintaining the aesthetic qualities of the steel, which is being demanded by more and more architects and engineers. Over the years, multiple generations of solventborne resins have been developed that, when formulated into end-use coatings, have proven durable and effective in reactive fire protection. We have offered such solutions based on a unique manufacturing process, polymer composition, and morphology. Now, a new water-based resin technology, based on the same chemistry and expertise, has been developed to meet the fire-resistance requirements of best-in-class products. This article describes the development of this technology, which allows formulators to achieve superior water resistance compared to current existing water-based products, when tested according to durability requirements of standards such as ETAG 018/EN 16623. Note de contenu : - INTUMESCENT COATINGS : WHAT ARE THEY ? HOW ARE THEY FORMULATED ? HOW DO THEY WORK ? - IMPORTANCE OF THE RESIN BINDER IN INTUMESCENCE - STANDARDS FOR FIRE PROTECTION COATINGS : Durability aspects - Durability standards - WATERBORNE INTUMESCENT COATINGS : Current binder technology for waterborne intumescent coatings - New binder for waterborne intumescent coatings - Formulation approach for new waterborne binder - EXPERIMENTAL : Testing protocol for evaluation of new binder - RESULTS AND DISCUSSION : Comparative evaluation of HPL211 with commercial VA-VV latex - Comparative evaluation of HPL211 formulation with commercial products - Table 1 : National fire resistance test standards around the world - Table 2 : Comparison of fire resistive material classification categories as defined in UL2431 and EN 16233 - Table 3 : Typical properties of new binder (HPL211) - Table 4 : Intumescent formulations based on new binder (HPL211) - Table 5 : Temperature/humidity cycles for accelerated aging - Table 6 : Fire test results, before and after accelerated exposure (Y conditions) - Table 7 : Fire tests resutls for new binder vs commercial WB and SB intumescent coatings - Fig. 1 : TGA curves of new waterborne binder vs traditional solventborne binder - Fig. 2 : Small-scale, propane-fired, laboratory test furnace - Fig. 3 : Effect of water soak on dry films and effect of water soak on intumescent properties - Fig. 4 : Effect of accelerated agine (W conditions) on dry films - Fig; 5 : Char structure, after fire testing, of intumescent formulation based on HPL21, compared to commercial waterborne and solventborne intumescent coatings En ligne : https://drive.google.com/file/d/14eHa-wgyRXTn4X2BlcMpX1kVI9e5DKJg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31210 [article]

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Contact-based nondestructive testing / Bob Dahlstrom in COATINGS TECH, Vol. 15, N° 7 (07/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 7 (07/2018) . - p. 44-48 Titre : Contact-based nondestructive testing : (NDT) at height with aerial robotics Type de document : texte imprimé Auteurs : Bob Dahlstrom, Auteur ; Jamie Branch, Auteur Année de publication : 2018 Article en page(s) : p. 44-48 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contrôle non destructif Contrôle technique Epaisseur -- Mesure Revêtements:Peinture Robots Surfaces -- Analyse Ultrasons Index. décimale : 667.9 Revêtements et enduits Résumé : To take nondestructive testing (NDT) measurements at height, equipment such as aerial lifts, scaffolding, ladders, or other solutions are required to reach areas on ships, bridges, aboveground storage tanks, flare stacks, and other infrastructure and industrial sites. This is both dangerous, due to the possibility of falls, and time consuming. In certain instances, it may also require taking an asset, such as a flare stack, offline so it can be accessed to take NDT readings. Handheld digital testing devices are traditionally used to perform NDT inspections of material surfaces, with the inspector physically accessing all test sites to obtain a measurement. Utilizing an aerial robotics platform for contact-based NDT measurements such as dry film thickness (DFT), surface profile (SP), or ultrasonic testing (UT) allows workers to remain safely on the ground while the device performs measurements at elevation. Figure 1 demonstrates how the pilot/inspector remains at ground level, while the aircraft approaches a ship for DFT measurements. In addition to being safer, the aerial robotic NDT measurement process can be faster due to the job no longer requiring access equipment and the manual intensity of a human measuring every inspection area. The use of an aerial robotics platform is a novel application utilizing existing NDT devices and available drone technologies equipped with a system of complex integrations; custom sensor arrays, printed circuit boards (PCB) and software, that allows for a better application of science. The system has the potential to improve the inspection, testing, and data collection aspects of assets by making the NDT measurement process easier and safer. This allows for more frequent measurements and/or a larger quantity of measurement samples at a more efficient rate. With an easier, faster, and safer method to collect NDT measurements from locations of height, we can expand the science of nondestructive testing by collecting data from locations where data was either inaccessible or difficult to obtain due to access issues, safety considerations, or other limitations. The patented aerial robotic system discussed in this article flies up to a structure, then under full autonomous software control, touches an NDT measurement probe (such as a DFT, SP, UT, etc.) to the target and records the measurement data compliant with SSPC, IMO PSPC, ISO, ASTM, API, or other standards. The goal of this article is to make readers aware of this new technology, specifically through DFT testing, as well as to provide information as to its efficacy, limitations, and operational requirements. Note de contenu : - Background : use of electronic DFT measurement devices - Prevailing 'manual' measurement methodology : Regulatory view on working at heights - NEW 'AERIAL ROBOTIC' MEASUREMENT METHODOLOGY - EFFICACY OF THE DATA COLLECTED BY AN 'AERIAL ROBOTIC' MEASUREMENT SYSTEM - Fig. 1 : Representative photo of handheld digital testing device - Fig. 2 : Aerial robotics DFT measurements testing - Fig. 3 : Real time DFT measurement user interface - Table : T-test En ligne : https://drive.google.com/file/d/1Zi4xwcw5z-MdL8s_bajxgBr-VlFErjaD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31211 [article]

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Hansen Solubility Parameters (HSP) : 2-Applications / Clifford K. Schoff in COATINGS TECH, Vol. 15, N° 7 (07/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 7 (07/2018) . - p. 76 Titre : Hansen Solubility Parameters (HSP) : 2-Applications Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2018 Article en page(s) : p. 76 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Paramètres de solubilité Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Table 1 : Distances from center of solubility for alkyd with radius of 10.0 En ligne : https://drive.google.com/file/d/1ku_gIkVJEhyIumS7NP-fCHDRtYFv7wwA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40015 [article]

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• Hansen solubility parameters (HSP) : 1-Introduction / Clifford K. Schoff in COATINGS TECH, Vol. 15, N° 5 (05/2018)

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