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New aerospace coatings reduce weight, speed up processing and enhance aesthetics / Daniel Bencun in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4646 (11/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4646 (11/2018) . - p. 15-17 Titre : New aerospace coatings reduce weight, speed up processing and enhance aesthetics Type de document : texte imprimé Auteurs : Daniel Bencun, Auteur Année de publication : 2018 Article en page(s) : p. 15-17 Langues : Anglais (eng) Catégories : Avions -- Revêtements:Avions -- Peinture Index. décimale : 667.6 Peintures Résumé : Aerospace is a high-end industry driven by technology and coatings for aircraft application arguably are among the most technologically advanced and complex. All characteristics need to deliver high performance without any compromise. Characteristics for coatings used on civil aircraft depend on the part and area of the application. Exterior aircraft pretreatments and structural primers provide adhesion for topcoats, corrosion resistance and protection against aggressive materials, such as aviation hydraulic fluids. Primers and topcoats help protect the aircraft surface from degradation by rain, ice, humidity, ultraviolet radiation, temperature extremes and other atmospheric conditions encountered during aircraft operation. Speciality coatings have unique qualities to address the functional needs of specific parts, such as fuel tanks and wings. Customers want durable topcoats with high-level aesthetics that retain their gloss and colour for several years. They also look for coatings to provide other functions, such as solar heat management to keep aircraft cooler ; reduced drag for better fuel economy; ice mitigation to reduce the need for de-icing aircraft prior to flight ; and easy cleaning solutions. Coatings products must perform as required under a challenging operating envelope while affording weight reduction, environmental compliance, fast processing and aesthetics. They also must meet global regulatory requirements for the aerospace industry. Note de contenu : - Weight reduction - Environmental compliance - Faster processing - Aesthetics En ligne : https://drive.google.com/file/d/1Voiw4GdiZdaMRuxslz-P5RYLTRSFaCTS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31518 [article]

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A versatile, high-performance polyol chemistry for broad industrial market use / Jamie Dziczkowski in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4646 (11/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4646 (11/2018) . - p. 20-25 Titre : A versatile, high-performance polyol chemistry for broad industrial market use Type de document : texte imprimé Auteurs : Jamie Dziczkowski, Auteur ; Sandra Case, Auteur ; Gianluigi Cassin, Auteur ; Jeremy Lizotte, Auteur ; Geoff Webster, Auteur Année de publication : 2018 Article en page(s) : p. 20-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Revêtements Automobiles -- Revêtements:Automobiles -- Peinture Automobiles -- Vernis Composés organiques volatils Durée de vie en pot Formulation (Génie chimique) Glycols Un glycol ou diol est un composé chimique organique portant deux groupes hydroxyle (-OH). Lorsque les deux groupes hydroxyle sont portés par le même atome de carbone, on parle de diol géminal. Parmi ceux-ci, on compte par exemple le méthanediol (H2C(OH)2) ou le 1,1,1,3,3,3-hexafluoropropane-2,2-diol ((F3C)2C(OH)2), la forme hydratée de l'hexafluoroacétone. On parle de diol vicinal lorsque les deux groupes hydroxyle sont en position vicinale, c'est-à-dire attachés à des atomes de carbone adjacents. On compte parmi ceux-ci l'éthane-1,2-diol ou éthylène glycol (HO-(CH2)2-OH), un composant courant des produits antigels ou le propane-1,2-diol (propylène glycol, HO-CH2-CH(OH)-CH3). Parmi les composés avec des groupes hydroxyles bien plus éloignés on compte le butane-1,4-diol (HO-(CH2)4-OH) ou encore le bisphénol A. Polyesters Polyols Réactions chimiques Résistance aux conditions climatiques Résistance chimique Revêtements (produits chimiques):Peinture (produits chimiques) Vernis bi-composant Index. décimale : 667.6 Peintures Résumé : Polyester polyol chemistry has been used extensively as a binder option in high performance industrial coatings applications for decades. Limitations of traditional polyester technology, such as weathering and chemical resistance have restricted its use to a co-binder due to the high level of performance requirements associated with these markets. Translating the use of a speciality monomer from copolyesters for thermoplastic applications, chemist at Eastman have evaluated the effectiveness of a unique glycol molecule as a building block in copolyester coatings resins targeted for use in automotive coatings, metal packaging applications for food cans and industrial applications like the agricultural and construction segment. Proven to enhance the hydrolytic stability and offer a balance of flexibility and hardness, the speciality polyol is enabling distinctive binder properties to address ever-changing global coatings needs. Fulfilling performance targets across very diverse fitness for use criterion, this paper capitalises on the versatility of the speciality polyol platform of resins. Through performance comparisons to next best alternative technologies, the improved durability will highlight the advantage of this next generation of polyol chemistry. Note de contenu : - Existing polyol technology - Speciality polyol design - Automotive and industrial applications - Table 1 : Common polyol chemistries used in liquid OEM coatings applications - Table 2 : Newman's empirical steric factors and material characteristics of common glycols - Table 3 : End use application and coating details for evaluating speciality polyester polyol performance - Table 4 : Target CTQ to address automotive monocoat and industrial topcoat market needs - Table 5 : Resin series used to evaluate novel polyol performance in two-component top application - Table 6 : White two-component formulations to evaluate performance in topcoat applications - Table 7 : Chemical resistance of various white topcoat chemistries - Table 8 : Cure response and pot-life for different industrial applications adjusted by catalyst selection - Table 9 : VOC ranges for two-component topcoats formulated with the speciality polyol IC-1 - Fig. 1 : Representative reaction of a polyol with melamine resin chemistry - Fig. 2 : Mechanism of thermosetting polyol/isocyanate reaction to form urethane linkage - Fig. 3 : Reaction of phenolic resin with polyol to create C-C linkage within the themoset - Fig. 4 : Chemical structure of 2,2,4,4-tetramethyl-1,3-cyclobutane diol (TMCD) - Fig. 5 : Newman's empirical steric factors and material characteristics of common glycols - Fig. 6 : Experimental half-life of model diesters after catalysed exposure to accelerated conditions - Fig. 7 : Improved chemical resistance trend with increasing levels of TMCD monomer in total diol in a two-component topcoat coating system - Fig. 8 : Common liquid OEM automotive and industrial paint layers and paint layer functions - Fig. 9 : Weathering resistance, QUV-A exposure of white topcoat systems at 2500hr - Fig. 10 : Salt spray resistance (840 hr) as measured by ASTM B117. The paint on right side of scribe (X) was removed to highlight undercut corrosion. The topcoat was applied directly to the metal (SP10 shot blasted steel) - Fig. 11 : Improved resistance of TMCD poyol-based coatings to Skydrol and brake fluid En ligne : https://drive.google.com/file/d/1vrYwpBiYJlEyNcFzbeadoe2gcWgovDet/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31575 [article]

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Innovative cross-linking enhances efficiency and effectivity of coating processes in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4646 (11/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4646 (11/2018) . - p. 31-32 Titre : Innovative cross-linking enhances efficiency and effectivity of coating processes Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 31-32 Langues : Anglais (eng) Catégories : Dispersions et suspensions Polyuréthanes Réticulation (polymérisation) Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Multi-curing waterborne polyurethane dispersion speeds up drying, cuts process times by up to half, and improves performance even under poor UV-curing conditions. The advantages of UV-curing waterborne polyurethane (PU) coatings are well known ; their disadvantages too: insufficient UV curing in shadow areas or for pigmented paints and a lengthy water evaporation phase before UV curing can Begin, for example. Now, a new multi-curing waterborne PU dispersion developed by Covestro has been shown to overcome these problems and deliver significant benefits. This innovative technology received the Alain Clause Award at the 2018 European Technical Coatings Congress in Amsterdam. This multi-curing technology in combination with the new multi-curing PU dispersion Bayhydrol® UV 2877 has been shown to improve the coating performance, even in such low UV dosage conditions. Even without UV curing, this technology delivers an adequate coating performance, and the properties can be clearly boosted when UV light is applied. While the inherent crosslinking of the polymer compensates for the possible lack of light, the chemical constitution of this new multi-curing technology speeds up the water release phase. This brings clear benefits. pictogram in the labelling. What's more, the product is partly manufactured from renewable sources. Besides requiring less photoinitiator, this technology also reduces the amount of UV and drying energy needed. Covestro's new multi-curing UV-curing polyurethane dispersion is suitable for a broad range of uses, eaclear and pigmented coatings, exterior applications and parquet on site. So what innovative development made this new crosslinking solution possible ? Note de contenu : - Limitations overcome - Practical benefits - Oxidative curing-secondary crosslinking - Reduced drying time - Lower costs - Improved robustness and line speed - High-quality wood finishes - FIGURES : Multi-curing possibilities - Clear wood coating performance without UV light - Multi-curing dispersion allows good performance without UV curing - Pigmented wood coating performance - Multi-curing dispersion improved performance in pigmented coatings - Multi-curing UV PUD : applications possibilities En ligne : https://drive.google.com/file/d/1OQLPnQM8kTvJ74S1h-gc4EMaYBKzLkMg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31576 [article]

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Versatile 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)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4646 (11/2018) . - p. 42-45 Titre : Versatile self-crosslinking polyurethane dispersion for low VOC coatings across multiple markets Type de document : texte imprimé Auteurs : Aditi Chavannavar, Auteur ; Jacob P. Brutman, Auteur ; Don M. Barber ; P. Kangas Année de publication : 2018 Article en page(s) : p. 42-45 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Auto-réticulation Brillance (optique) Dureté (matériaux) Essai de dureté Essais d'adhésion Formulation (Génie chimique) Matières plastiques -- Revêtement Polymères en émulsion Polyuréthanes Résistance chimique Revêtements en phase aqueuse Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Although solvent-based coatings are prominent in industrial applications, environmental regulations are pushing coating companies and formulators towards water-based systems". Industrial coatings include applications like household appliances, construction machinery, garage doors, fitness equipment, kitchen flttings, industrial joinery, etc. These are mostly applied on metal and the main function is to protect the substrate and make it aesthetically appealing. Other properties that industrial coatings need to have are adhesion to metal, block resistance and high gloss. In this area, we have benchmarked PUD prototype with PUD A and PUD B in white pigmented formulations. Additionally, we have compared PUD prototype to PUD C, which is a commercially available self-crosslinking PUD marketed for metal and plastic coatings. Table 9 summarises the properties of the resins in this application Note de contenu : - INDUSTRIAL COATING APPLICATIONS : Formulations and application - Application testing on CRS gloss and hardness - Adhesion - Chemical resistance - Block resistance - CONCLUSION FOR INDUSTRIAL COATINGS - PLASTIC APPLICATIONS : Formulation and application - APPLICATION TESTING ON PC/ABS PLASTIC : Gloss - hardness - Chemical resistance - Resistance to sunscreen and insect repellent - Resistance to hand sanitiser - Adhesion to plastic - CONCLUSION OF PLASTIC COATING STUDY - Fig. 5 : Gloss and hardness of pigmented formulations - Fig. 6 : Gloss for plastic coatings - Fig. 7 : Konig pendulum hardness of the coatings for plastic - Fig. 8 : Resistance to sunscreen and insect repellent - Table 9 : Properties of resins in industrial coating study - Table 10a : White pigmented formulation for PUD prototype - Table 10b : White pigmented formulation for PUD A - Table 10c : White pigmented formulation for PUDB - Table 10d : White pigmented formulationfor PUD C - Table 11 : Adhesion on CRS - Table 12 : Cheimcal resistance of coatings - Table 13 : One hour recovery after chemical resistance testing - Table 14 : Block resistance of the coatings - Table 15a : Soft touch, clear, matte formulation for PUD prototype - Table 15b : Clear, matte formulation for PUD C - Table 16 : Chemical resistance on plastic - Table 17 : One hour recovery after chemical resistance testing - Table 18 : Hand sanitiser resistance - Table 19 : Adhesion to PC/ABS En ligne : https://drive.google.com/file/d/1z3xM0GySly3M4eOpKATRBJdvl7c2S7Zg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31577 [article]

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Polymer Paint Colour Journal - PPCJ Vol. 208, N° 4646 URL