Low VOC topcoats using ultra high solids resins / Gautam Haldankar in COATINGS TECH, Vol. 18, N° 9 (09/2021)  

[article]  inCOATINGS TECH > Vol. 18, N° 9 (09/2021) . - p. 24-31 Titre : Low VOC topcoats using ultra high solids resins Type de document : texte imprimé Auteurs : Gautam Haldankar, Auteur ; Niel Pfendt, Auteur Année de publication : 2021 Article en page(s) : p. 24-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Evaluation Formulation (Génie chimique) Haut extrait sec Polyacryliques Polyols Résistance chimique Revêtements organiques Solvants -- Suppression ou remplacement Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : In the North American coatings market, traditional solventborne resins are still used to a large extent, enabled by regulations that allow for the use of certain solvents exempt from restrictions placed on most volatile organic compounds (VOCs) in the United States. The future of the exempt status of parachlorobenzotrifluoride (PCBTF) and tertiary butyl acetate (TBAc) is a concern in certain districts of California, and other regions may follow suit. Coating companies are ramping up their research efforts in formulating paint without exempt solvents. Researchers are opting to formulate with high solids resins. High-performance acrylic polyols were studied to understand the effect of various resin parameters on coatings performance. A set of resins with 80-90% solids was tested in pigmented topcoat formulations. These topcoats contained VOCs ranging from 200 to 250 g/L, without the use of exempt solvents. Various conventional and advanced film properties were evaluated, including weathering performance by xenon arc exposure, cure kinetics using infrared (IR) spectroscopy, and crosslink density by dynamic mechanical thermal analysis (DMTA). Correlation was obtained between coatings performance properties and resin characteristics such as equivalent weight, glass transition temperature, etc. The understanding of structure property correlation offers tremendous value not only for North American coatings researchers but also to the global community. Note de contenu : - EXPERIMENTAL FINDINGS : Resin characteristics - Formulation and evaluation of clear films - Formulation of white topcoat - Evaluation of white topcoat - RESULTS AND DISCUSSION : Disappearance of isocyanate by FTIR - Comparative film properties of white topcoat - Xenon weatherometer testing - Table 1 : Characteristics of polyol resins - Table 2 : Formulation guide to prepare clear film for DMTA analysis - Table 3 : Formulation of white 2K topcoat with VOC ≤ 250 g/L - Table 4 : Characteristics of formulated white topcoat - Table 5 : Flexibility of the film after one month of cure - Table 6 : Chemical resistance of ≤ 250 g/L white topcoats En ligne : https://drive.google.com/file/d/1OWpp2GZYlpsNJzc2GeK5yE0_Yyzz7Zcm/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36422 [article]

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Non-isocyanate coatings with fast return to service and excellent appearance for industrial flooring application / Ulises Brauer in COATINGS TECH, Vol. 18, N° 7 (07/2021)  

[article]  inCOATINGS TECH > Vol. 18, N° 7 (07/2021) . - p. 42-52 Titre : Non-isocyanate coatings with fast return to service and excellent appearance for industrial flooring application Type de document : texte imprimé Auteurs : Ulises Brauer, Auteur ; Phillip Tomes, Auteur ; Gautam Haldankar, Auteur Année de publication : 2021 Article en page(s) : p. 42-52 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Durée de vie en pot Essais accélérés (technologie) Formulation (Génie chimique) Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Résistance chimique Revêtements de sols industriels Revêtements organiques Revêtements sans isocyanates Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : A new application of Michael Addition (MA) chemistry was recently explored and developed for use in industrial flooring. Historically, MA was not applied in protective coatings due to the extremely fast reactivity which resulted in poor appearance and unacceptably short pot life. Now, the development of a blocked catalyst and incorporation of kinetic additives have allowed formulators to tame and control the speed of the MA reaction. This novel technology exhibits excellent chemical properties compared to traditional systems, providing the best balance between working time, appearance, and fast return to service. This MA technology is comprised of a wide variety of donor and acceptor resins, giving the formulator the ability to tailor coatings to meet specific performance goals. Polyaspartic (PA) technology is used when fast cure and hardness development is required in flooring systems. However, this contractor-applied system requires highly skilled labor due to its very short pot life and sensitivity to adverse application conditions such as high environmental moisture and temperature. In this study, different combinations of resins and kinetic additives were explored to match properties of a commercial polyaspartic for industrial flooring. The MA-based system produced coatings that displayed outstanding chemical and physical properties, exterior durability, longer working times, excellent appearance, low volatile organic compounds (VOCs), and fast return to service. Another added value of this technology over traditional systems is the offering of a non-isocyanate (NISO) solution to customers who are looking to comply with increasing regulatory restrictions. This study also presents the rheology study of various formulations and demonstrates that lapping time and flow-leveling of MA coatings can be modified to meet industrial market needs. Note de contenu : - EXPERIMENTAL : Selection of resins - Application and conditioning of panels - Instruments - Chemical resistance - Application by Roller - Accelerated weathering - RESULTS AND DISCUSSION : Formulation of a fast return-to-service coating - Coating chracteristics of ultra-fast cure formula - Adjusting MA formulations to extend working time - Pot life - Tie-in time (lapping) - Hardness development and return-to-service relationship - Chemical resistance - Accelerated weathering - Fig. 1 : Michael addition chemistry applied in polymers - Fig. 2 : Appearance of floor coatings roller-applied after 50 minutes of activation - Table 1 : Preferred MA resins for flooring application - Table 2 : Formulation of clear MA UFC - Table 3 : Coating properties of clear MA UFC - Table 4 : Performance characteristics of clear MA UFC - Table 5 : Formulation of clear MA FC - Table 6 : Coating properties of clear MA FC - Table 7 : Performance characteristics of clear MA FC - Table 8 : Chemical spot test results for MA FC and PA En ligne : https://drive.google.com/file/d/1K7S6ak7DVAvThtIgJ8NdjkeNkWgUespT/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36045 [article]

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(Re)finishing in the fast lane / Gautam Haldankar in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2014)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11 (11/2014) . - p. 28-32 Titre : (Re)finishing in the fast lane : DTM acrylic polyol for 2K polyurethane coatings eliminates etch primer Type de document : texte imprimé Auteurs : Gautam Haldankar, Auteur ; Alan Woosley, Auteur Année de publication : 2014 Article en page(s) : p. 28-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Automobiles -- Vernis Métaux -- Surfaces Polyacryliques Polyols Vernis bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : A novel acrylic polyol than provides excellent adhesion to various metal substrates was developed, with the aim of allowing the etch (wash) primer coat to be eliminated from vehicle refinish applications. On cold roller steel substrate formulated primer gave superior corrosion and humidity resistance without an etch primer. Note de contenu : - Automotive refinishing systems outlined - Resin selection and initial test procedures - Primer formulations and evaluation - Marked differences fond in clear coatings'adhesion - Adhesion and corrosion tested on primer formulations - Excellent results in humidity tests - Overall costs cut with no loss performance En ligne : https://drive.google.com/file/d/13nZmMWQW1QiR0Xv6SEMyW9krDDf02q-8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22177 [article]

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Solving a sticky problem / Elwin de Wolf in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2019)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2019) . - p. 18-24 Titre : Solving a sticky problem : A new CPO acrylic adhesion promoter resin for plastic coatings Type de document : texte imprimé Auteurs : Elwin de Wolf, Auteur ; Taki Fu, Auteur ; Heert Andringa, Auteur ; Gautam Haldankar, Auteur ; Kenneth Weaver, Auteur ; William Liu, Auteur ; Mark Dai, Auteur Année de publication : 2019 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Automobiles -- Revêtements Automobiles -- Vernis Copolymères greffés Formulation (Génie chimique) Matières plastiques -- Revêtement:Matières plastiques -- Peinture Polyoléfines chlorées Primaire (revêtement) Promoteurs d'adhésion Revêtements organiques Vernis bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : The increasing use of plastic parts in car manufacturing presents an adhesion issue for paint formulators. This article describes the use of a new, toluene-free chlorinated polyolefin (CPO)-grafted polyacrylate for use in paints and which achieves excellent adhesion to plastic substrates. The potential to incorporate the novel resin in primers or basecoats could also reduce the number of coating layers and streamline the painting process. Note de contenu : - Mechanisms for COP coating adhesion - GPO grafted polymers to avoid use of toluene - Novel resin offers good stability and streamlines painting process - No whitening from COP acrylate - Durable direct-to-plastic paints - Multiple uses for novel acrylic resin - Table 1 : Properties of "Setalux XCS 1518 B1-45 - Table 2 : Example of a 1K physical drying guiding formulation containing CPO acrylate - Table 3 : Application data of formulation based on CPO acrylate as listed in table 2 - Table 4 : Application data of a 2K direct-to-plastic monocoat containing CPO acrylate - Fig. 1 : General structure of a chlorinated polyolefin - Fig. 2 : Schematic representation of adhesion of a coating layer by entanglement of CPO with plastic substrate - Fig. 3 : Layer elimination possible with compatible CPO acrylate - Fig. 4 : Gloss 20° and ΔE development in time during QUVB durability testing of a 2K white direct-to-plastic topcoat bsed on the novel resin En ligne : https://drive.google.com/file/d/1B7D1xiso4cRly6jqRVrGuRwAfunE7lYG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33047 [article]

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