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Functional powder coatings via isocyanate-cured phenolics and benzoxazines / Weih Lee in COATINGS TECH, Vol. 17, N° 7 (07/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 16-23 Titre : Functional powder coatings via isocyanate-cured phenolics and benzoxazines Type de document : texte imprimé Auteurs : Weih Lee, Auteur ; Robert Polance, Auteur ; Hart Haugen, Auteur Année de publication : 2020 Article en page(s) : p. 16-23 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Benzoxazine Calorimétrie Formulation (Génie chimique) Isocyanates Phénols Polyuréthanes Revêtements anti-graffitis Revêtements poudre Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : In this work centering around phenolic chemistry, we investigated isocyanate and benzoxazine-modified phenolic powder coatings for use in anti-graffiti applications and for addressing downhole drill pipe interior coating challenges. Allied polyurethane formulations were developed using phenolic hydroxyl-isocyanate reactions and shown to outperform conventional aliphatic polyol-isocyanate coatings for graffiti-resistant applications. Effects of variables like phenol hydroxyl equivalent weights and molecular weights of phenolic resins were examined. In a separate effort intended for oil and gas downhole pipe interior lining applications, novel fusion-bonded benzoxazine-epoxy-phenolic formulations, without or with an acid catalyst, exhibited excellent adhesion, toughness, and process-ability, in addition to greatly reducing cure requirements as compared to benzoxazine self-polymerization. Applicable rheology and kinetics of cure were quantified, revealing characteristic flow and cure behaviors to strengthen the understanding of structure-property relationships and to facilitate efficient optimization of coating performance. Note de contenu : - MATERIALS AND METHODS : Dynamic mechanical analysis and differential scanning calorimetry - Physycal testing - RESULTS AND DISCUSSION : Phenolic PU - Fusion bonded benzoxazines - Fig. 1 : Chemical structure of BPA-derived phenolic resins - Fig. 2 : Simplified benzoxazine self-crosslinking - Fig. 3 : Chemical structure and basic properties of BOX80 - Fig. 4 : Di-functional BPA phenolic resins and internally blocked IPDI dimers were reacted to yield a thermosetting PU - Fig. 5 : Taber abrasion weight losses - Fig. 6 : Rheological DMA profiles for UO-D8 - Fig. 7 : DSC exothermic curves and kinetic data - Fig. 8 : Rheological DMA profiles for BOX80 self-crosslinking - Table 1 : Formulation matrix and physical properties - Table 2 : Complete kinetics and cure schedules En ligne : https://drive.google.com/file/d/17EjEnXJZc80tkHpeRfLrIV1RFYHJmg9j/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34341 [article]

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Antiviral coatings may help prevent transmission of COVID-19 in COATINGS TECH, Vol. 17, N° 7 (07/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 14-15 Titre : Antiviral coatings may help prevent transmission of COVID-19 Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 14-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Revêtements antiviraux Revêtements hygiéniques Index. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/17XkN2gxaMQhc5FK3qxvd2TrD0d3Lsy7P/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34342 [article]

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Innovative self-initiating UV-curable polyurethane dispersions in COATINGS TECH, Vol. 17, N° 7 (07/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 44-52 Titre : Innovative self-initiating UV-curable polyurethane dispersions Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 44-52 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Finition Bois -- Revêtements Essai de dureté Formulation (Génie chimique) Photoamorceurs (chimie) Polyuréthanes Résistance à l'humidité:Résistance à l'eau Résistance chimique Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet:Peinture en phase aqueuse -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne (WB) UV-curable polyurethane dispersions (PUDs) are the binders of choice in many industrial wood applications. These resins are formulated with photoinitiators that absorb energy and initiate consecutive free radical-curing reactions. Traditional photoinitiators include both Type I (photo cleavage) and Type II (H- abstraction) classes, which are effective for surface curing.1 Because these products are classified as environmentally damaging (toxic to aquatic life) and can be a health hazard (suspected carcinogen), it is essential to fully react these components during curing because of potential migration of unreacted residual amounts. Such concerns are especially important considering the use of these materials for skin- or food-contact applications. New-generation UV-curable PUDs have been developed with initiating sites based on Type II photoinitiators incorporated into the backbone of the polymer. These new self-initiating (SI) polymers have been evaluated for use in industrial wood applications and benchmarked against traditional WB UV PUDs formulated with both conventional and polymeric photoinitiators. The performance of both clear and pigmented coatings has been investigated. A series of five SI WB UV resins has been developed. These polymers are SI versions of existing WB UV resins. These WB UV resins are all acrylic/polyester polyurethane dispersion hybrids with a minimum film formation temperature (MFFT) of approximately 0 oC. Table 1 summarizes the physical properties and characteristics of the resins evaluated. Note de contenu : - INTRODUCTION : Experimental - Clear self-sealing topcoats - Panel preparation - PROCEDURES AND RESULTS : König pendulum hardness - Boiling water resistance - Chemical/stain resistance - Scrape adhesion - Ball point pen indentation - Green print resistance - Hot print resistance - Edge soak - Plasticizer resistance - Hot and cold check resistance - Table 1 : Physical properties and characteristics - Table 2 : Clear self-sealing topcoat - Table 3 : Coating performances for industrial wood finishes - Table 4 : SI WB UV 5 reformulated with type 1 photoinitiator - Table 5 : White self-sealing topcoat formulations - Fig. 1 : König pendulum hardness (sec) - Fig. 2 : Boiling water resistance - Fig. 3 : Chemical resistance using KCMA specifications - Fig. 4 : Chemical resistance using office furniture specifications - Fig. 5 : Scrape adhesion in Kg passed - Fig. 6 : Ball point pen indentation in grams passed - Fig. 7 : Chemical resistance using KCMA specifications - Fig. 8 : Chemical resistance using office furniture specifications - Fig. 9 : Boiling water resistance comparison - Fig. 10 : Scrape adhesion - Kg passed and ball point pen indentation - grams passed - Fig. 11 : König pendulum hardness (sec) - Fig. 12 : Chemical resistance using office furniture specifications - Fig. 13 : König pendulum hardness (sec) - Fig. 14 : Chemical resistance using KCMA specification - Fig. 15 : Chemical resistance using office furniture specifications En ligne : https://drive.google.com/file/d/1GgVQoKGEGbyU8o-MghvmFLVAL8qfoKXu/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34343 [article]

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Pigment dispersion II, testing / Clifford K. Schoff in COATINGS TECH, Vol. 17, N° 7 (07/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 56 Titre : Pigment dispersion II, testing Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2020 Article en page(s) : p. 56 Langues : Américain (ame) Catégories : Dispersions et suspensions Essais (technologie) Floculation Pâte pigmentaire Pigments Taille des particules Index. décimale : 667.2 Colorants et pigments Résumé : Pigment dispersion quality in pastes and paints may be tested by one of several different techniques. Probably the most common method in labs and plants is taking readings with a grind gauge, usually the Hegman type (ASTM D1210). The main reason for doing this for pastes usually is to see whether the dispersion process has reached the required end point for that pigment. Another reason would be to find out whether the dispersion equipment was adequate to achieve the target reading in a reasonable length of time. Hegman readings of 6 and 7 correspond to particle sizes of 25 and 12.5 mm, respectively, yet the average pigment particle size will be a fraction of that, perhaps as little as 1/10th. With a grind gauge, we only see the boulders, the largest particles (aggregates, agglomerates). Beginners find grind gauges frustrating to use and their precision is poor, but experienced users can produce rapid, repeatable, and meaningful results. Note de contenu : - Fig. 1 : Photomicrograph of a pigment paste. Almost no individual particles are visible - Fig. 2 : Paint made from the above paste. Individual particles are discernible along with loose clumps, which were easy to disperse En ligne : https://drive.google.com/file/d/1EzjVGBicVAL1b0D2_47N6mgIPlZly_Kl/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34344 [article]

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Coatings Tech Vol. 17, N° 7 URL