Additives to control the rheology of paints and coatings / Leo J. Procopio in COATINGS TECH, Vol. 18, N° 10 (10/2021)  

[article]  inCOATINGS TECH > Vol. 18, N° 10 (10/2021) . - p. 26-32 Titre : Additives to control the rheology of paints and coatings Type de document : texte imprimé Auteurs : Leo J. Procopio, Auteur Année de publication : 2021 Article en page(s) : p. 26-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epaississants Latex Revêtements -- Additifs:Peinture -- Additifs Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Formulating paints and coatings to provide the right balance of properties is a complex undertaking. Getting the rheology profile correct is just one important task on the formulator’s to-do list, but it is crucial to the ultimate success of the coating. The rheology profile influences properties of the coating throughout its lifetime, from manufacture, storage, mixing, and application, to the resulting film properties. To control and optimize the rheology of liquid coatings, the formulator typically relies on additives, often referred to as rheology modifiers, thickeners, and thixotropes. This article reviews some of the basics of rheology and rheological additives and includes comments from a roundtable discussion with industry experts on existing challenges and new developments. Note de contenu : - Basics of rheology - Shear rate and physical processes - Targeting a viscosity profile when formulating - Additives for rheology control - Fig. 1 : Definition of some key rheological parameters for a liquid under shear - Fig. 2 : Types of rheology profile displayed by liquids - Fig. 3 : Examples of shear rates for various processes used in the paint and coatings industry, and for some common methods of measuring viscosity - Fig. 4 : Thickening mechanism for latex coatings with non-associative rheology modifiers - Fig. 5 : Thickening mechanism for latex coatings with associative rheology modifiers En ligne : https://drive.google.com/file/d/19pKoYryDqqsbD1TW2qiGqt1pea_QhzVx/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36457 [article]

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Developments in waterborne thermal insulation coatings / Sudhir Achar in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 3 (03/2013)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 30, N° 3 (03/2013) . - p. 48-59 Titre : Developments in waterborne thermal insulation coatings Type de document : texte imprimé Auteurs : Sudhir Achar, Auteur ; Leo J. Procopio, Auteur Année de publication : 2013 Article en page(s) : p. 48-59 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Aérogels Allongement (mécanique) Anticorrosion Charges (matériaux) Epoxydes Gel de silice Isolants Isolation thermique Métaux -- Revêtements protecteurs Microsphères Polyacryliques Polycarbonates Primaire (revêtement) Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en phase aqueuse:Peinture en phase aqueuse Thermocinétique Index. décimale : 667.9 Revêtements et enduits Résumé : The inadvertent transfer of thermal energy in the form of heat leads to a variety of issues in industrial settings. Issues include heat loss from processing equipment and piping, increased energy usage, worker injuries from contact with hot substrates, and associated costs. The traditional insulation methods to combat these issues include use of materials such as fiberglass and polyurethane foam ; however, thick layers of insulation can often hide severe maintenance problems such as corrosion under insulation (CUI). An alternative to traditional insulation is the use of thin-film thermal insulation coatings based on waterborne acrylic and epoxy resins. This article describes our efforts to better understand the polymer design and formulation parameters for these thin-film waterborne thermal insulation coatings. Their potential use in thermal insulation will be described through test results on thermal conductivity, safe-touch properties, and corrosion performance in multilayer systems that can be applied by traditional methods. Both one-component waterborne acrylic and two-component waterborne epoxy resins and coating formulations have been evaluated and compared to commercial insulation coatings. The use of two types of low thermal conductivity fillers, hollow glass microspheres and silica aerogel, is also described. Note de contenu : - How heat transfers - Types of thermal insulation for industrial plants - Experimental - Table 1 : Thermal conductivity on common materials - Table 2 : Coating identification for insulation coatings evaluated - Table 3 : Results of thermal conductivity measurement - Table 4 : Results of tensile, elongation, adhesion, humidity, and salt spray testing for insulation coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18792 [article]

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Enhancing the UV durability of epoxy coatings / Hank Bernacki in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 3 (03/2018)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 3 (03/2018) . - p. 44-54 Titre : Enhancing the UV durability of epoxy coatings : Waterborne acrylic-epoxy hybrid coatings for steel Type de document : texte imprimé Auteurs : Hank Bernacki, Auteur ; Zhenwen Fu, Auteur ; Bingquan Li, Auteur ; Denise Lindenmuth, Auteur ; Leo J. Procopio, Auteur Année de publication : 2018 Article en page(s) : p. 44-54 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Epoxydes Latex Métaux -- Revêtements protecteurs Métaux -- Revêtements:Métaux -- Peinture Polyacryliques Polymères -- Synthèse Revêtements bi-composant:Peinture bi-composant Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy chemistry is prevalent throughout coatings science and is utilized heavily for industrial maintenance coatings for steel and concrete. Epoxy coatings have many excellent properties, such as adhesion, corrosion resistance and hardness. However, bath solventborne epoxies and lower-VOC waterborne analogs have deficiencies such as brittleness, short potlives and must notably, pour durability towards UV light. Due to their pour weathering characteristics, epoxies tend tu chalk, yellow and lose gloss quickly when exposed to sunlight. A hybrid technology has been described that maintains the best qualities of epoxy chemistry, while im¬proving upon some of its weaknesses such as flexibility and UV durability. The hybrid technology joins acrylic and epoxy chemistries into a single waterborne offering that can then be formulated into 2K waterborne coatings for steel and concrete. The AEH represents a new method for supplying epoxy resin into a mixed 2K coating. The epoxy resin is hosted in acrylic latex particles and becomes available for cross-linking with a hardener after water begins to leave the film and particle coalescence starts. The AEH system is versatile in that either acid-functional acrylic or amine hardeners can be used. The result is a coating technology with a unique balance of properties, including long potlife, excellent corrosion resistance, good flexibility, and excellent UV durability and weatherability. Note de contenu : - Acrylic-epoxy hybrid technology - Comparison of AEH technology with solventborne epoxies - Table : Comparison of gloss white DTM finishes - Fig. 1. The formation of DGEBA from bisphenol A and epichlorohydrin - Fig. 2. The advancement of DGEBA into higher molecular weight Bis A epoxy resins - Fig. 3. Types of waterborne epoxy coatings - Fig. 4. Synthetic process for preparation of an acrylic-epoxy hybrid (AEH) polymer - Fig. 5. Detailed view of epoxy transporting into the acrylic latex particle to form the AEH polymer - Fig. 6. Possible 2K waterborne coatings based on AEH polymers - Fig. 7. Salt spray panels after 1000 hours of exposure to ASTM B117 - Fig. 8. Gloss retention on accelerated UV-1 exposure of 2K gloss white DTM coatings - Fig. 9. Gloss retention of 2K gloss white DTM coatings comparing AEH/acrylic, AEH/amine and SB epoxy/amine systems En ligne : http://www.paintsquare.com/jpcldigital/201803/index.html?page=46 Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30377 [article]

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Formulation high-performance waterborne acrylic : Direct-to-metal coatings under 25 g/L VOC / Kathleen Auld in COATINGS TECH, Vol. 17, N° 9 (09/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 9 (09/2020) . - p. 20-29 Titre : Formulation high-performance waterborne acrylic : Direct-to-metal coatings under 25 g/L VOC Type de document : texte imprimé Auteurs : Kathleen Auld, Auteur ; Matthew Padaon, Auteur ; Leo J. Procopio, Auteur Année de publication : 2020 Article en page(s) : p. 20-29 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Anticorrosifs Anticorrosion Application directe sur le métal Essais de brouillard salin Formation de film Formulation (Génie chimique) Polyacryliques Résistance à l'humidité Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne direct-to-metal (DTM) coatings for the protection of steel infrastructure are currently in demand because they allow the end user to reduce volatile organic compound (VOC) emissions, promote higher safety standards, and take advantage of sustainable technology. Raw material and formulation modifications necessary to reach low-VOC content must be carefully designed, as typical approaches often lead to trade-offs in properties such as block, corrosion, and dirt pickup resistance (DPUR). Today, waterborne acrylic DTM coatings at 50 g/L VOC with a good balance of properties are available, but a demand for even lower VOC content exists. This article describes a new acrylic resin for formulating DTM coatings at a VOC level further reduced to less than 25 g/L, while also demonstrating the highest standards of exterior durability and corrosion resistance. A comparison to currently available low-VOC resins and DTM coatings will be described to highlight the advantages of the new binder. Note de contenu : - Table 1 : Gloss white formulation DTM-1 - Table 2 : Comparison of different coalescent packages for LTFF with binder AC-1 - Table 3 : Comparison of experimental and commercial DTM coatings for LTFF - Table 4 : Testing results for gloss, hardness, DPUR, and oil softening - Table 5 : Results of dry and wet crosshatch tape adhesion, rated accordint to ASTM D3359 - Table 6 : Results for humidity resistance testing in a Cleveland condensation cabinet with rating for blistering after and 500 h of exposure on both smooth CRS and BHRS substrates - Fig. 1 : Film formation mechanism for a pigmented coating based on a conventional acrylic latex - Fig. 2 : Film formation mechanism for a pigmented coating based on latex-pigment composite technology such as in AC-1 - Fig. 3 : 60° gloss retention of experimental and commercial DTM coatings on QUV-A exposure - Fig. 4 : Block resistance ratings of DTM coatings - Fig. 5 : Picture of panels after 1000 h salt spray corrosion resistance according to ASTM B117. Coatings were applied to BHRS panels. Note that the pictures for COM-2 and COM-3 were taken after 342 h and 500 h of exposure, respectively En ligne : https://drive.google.com/file/d/1JVtuCWcWAOxRWBKMyg2p2kkL4ps59KTO/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34489 [article]

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Improving performance / William J. Rosano in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4515 (08/2007)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 197, N° 4515 (08/2007) . - p. 18-21 Titre : Improving performance Type de document : texte imprimé Auteurs : William J. Rosano, Auteur ; Marie Bleuzen, Auteur ; Gary R. Larson, Auteur ; Leo J. Procopio, Auteur Année de publication : 2007 Article en page(s) : p. 18-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique) Chlorure de polyvinyle Dioxyde de titane Encapsulation Latex Plan d'expérience Résistance à l'abrasion Résistance au lavage Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The performance and appearance of pigmented waterborne coatings strongly depend on the degree to which the various particles (pigments and polymer) are dispersed throughout the dried film. The ideal state of dispersion is usually when all particles are reduced to and remain as non-flocculated primary particles. Polymer particles, pigments and fillers, not optimally dispersed can adversely affect the ability of the coating to provide adequate barrier (to electrolytes, water, gases, etc) properties. In addition, poorly dispersed pigments and fillers can affect the ability to add colourant as well as paint colour stability under the applied shear forces that can occur during application (eg brushing and spraying). Note de contenu : - More efficient interaction between pigment and latex polymers - Experimental design - Improved gloss through more even pigment dispersion - Improved hiding power - Superior protective properties - Improved wash and scrub resistance - Pigment particles with superior encapsulation - Quality improvements and cost advantages - TABLES : 1. Film gloss and gloss retention after UV-A exposure of 18 PVC white paints based on CFM or SM containing binders - 2. Film gloss (20°/60°) as a functionof TiO2 loading of paints based on CFM or SM containing binders - 3. Contrst ratio as a functionof TiO2 loading for paints based on CFM or SM containing binders - 4. Blister formation of 18 PVC white paints based on CFM or SM containing binders after a two week exposure to salt frog - 5. Paint removal after 200 scrub cycles of an above critical PVC paint - 6. Percent latex adsorbed for polymer composition based on CFMs and SMs - FIGURES : 1. FE-SEM of dried 18 PVC TiO2 paints cast one on top of the other based on composition A using CFM (top half ofimage) and SM (lower half of image) - 2. Coating resistance (Rc) as a function of exposure time to a 5% NaCl solution as derived from EIS spectra of SM (red trace, closed symbols) and CFM (blue trace) based polymers formulated in white gloss paints En ligne : https://drive.google.com/file/d/1CGxKiTXix5LafmbC9emeI8eH9Rnd4W0T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27308 [article]

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Low-VOC waterborne coatings for use in industrial maintenance painting / Leo J. Procopio in COATINGS TECH, Vol. 4, N° 2 (02/2007)  

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Making connections / Rémi Briand in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/2008 (10/2008)  

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Optimal dispersion / Marie Bleuzen in EUROPEAN COATINGS JOURNAL (ECJ), N° 05/2007 (05/2007)  

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Technical highlights from the 2022 American Coatings Conference / Leo J. Procopio in COATINGS TECH, Vol. 19, N° 5 (05-06/2022)  

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Thermal insulation coatings : Controlling heat flow wxith a functional coating / Leo J. Procopio in COATINGS TECH, Vol. 19, N° 2 (02/2022)  

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Transparent benefits / Laura M. Vielhauer in EUROPEAN COATINGS JOURNAL (ECJ), N° 03/2008 (03/2008)  

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Watching paints weather / Leo J. Procopio in COATINGS TECH, Vol. 19, N° 7 (08-09/2022)  

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Waterborne direct-to-metal coatings / Leo J. Procopio in COATINGS TECH, Vol. 19, N° 6 (07/2022)  

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Wood coating performance / Leo J. Procopio in COATINGS TECH, Vol. 9, N° 2 (02/2012)  

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