Hydrophilic polyisocyanates : the best balance between performance and environmental concern / Philippe Olier in PAINTINDIA, Vol. LXV, N° 3 (03/2015)  

[article]  inPAINTINDIA > Vol. LXV, N° 3 (03/2015) . - p. 75-80 Titre : Hydrophilic polyisocyanates : the best balance between performance and environmental concern Type de document : texte imprimé Auteurs : Philippe Olier, Auteur Année de publication : 2015 Article en page(s) : p. 75-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Essais d'adhésion Formulation (Génie chimique) Polyisocyanates hydrophiles Réticulants Revêtements bi-composant:Peinture bi-composant Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : It is no secret today that the quest for more environmentally friendly and healthier products is a key preoccupation among a lot of chemical companies. In many cases, regulation constraints have led to reconsider bath technologies and products but certainly not performances. Coatings particularly is one field in which high performance is required since the function of a coating, outside of the aesthetics, is mainly to protect the substrate it is applied on. Polyurethane coatings, especially two components systems, are very appreciated for their outstanding performances, especially durability and outdoor weatherability. When health and environmental preoccupations started to be at the forefront, 2K polyurethane waterborne coatings became naturally a route to follow, especially to reduce Volatile Organic Compounds (VOC) in the formulations. The challenge was above all to design waterborne formulations containing polyisocyanates which would be stable, regarding the reaction with water. Such a formulation should provide enough time to enable application and film formation with good end properties. Hydrophilic polyisocyanates were the answer and many synthesis routes were tried, each one having of course, advantages and drawbacks. In this paper, we will present a study aiming to highlight differences regarding the nature of the hydrophilic polyisocyanates. Latest developments of Vencorex in this field will be also included. Note de contenu : - POLYISOCYANATE : HOW TO MAKE IT HYDROPHILIC ? - EXPERIMENTAL : Hardeners - Starting point formulations - RESULTS : Emulsification ability - Application properties - TABLES : 1. Solubility parameters of hexamethylene trimer or biuret - 2. Characteristics of the hardeners - 3. Formulations - 4. Evaluation of adhesion with cross hatch and tape adhesion test - FIGURES : 1. : Particle size distribution of Easaqua XL 600 and polyisocyanate 1 into water - 2. Visual aspect of formulations regarding the mixing time and the nature of the polyisocyanate - 3. VOC, gloss and Koenig hardness of coatings made with Easaqua XL 600 and polyisocyanate. 1. Polyisocyanate 1 contains 20% solvent - 4. Contact angle of a drop of water with the surface. High angle values indicate hydrophobic surfaces. Angle values over 90° are the sign that the liquide does not wet the substrate - 5. Contact angle measurement of water on 2K waterborne coatings (initial and after 3 days at 100% RH and 50°C - 6. Visual aspect of the coatings after crosshatch and tape adhesion test - 7. Visual aspect of coated panels after 350 hours of salt spray test En ligne : https://drive.google.com/file/d/1mWEEPsgKAs7RQgi3rIxpy7dCyWmc-YoP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24150 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
17240	-	Périodique	Bibliothèque principale	Documentaires	Disponible

New standard for wood coatings in EUROPEAN COATINGS JOURNAL (ECJ), N° 9 (09/2019)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9 (09/2019) . - p. 20-25 Titre : New standard for wood coatings : 2K water-borne polyurethane systems without sacrificing drying time Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 20-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements protecteurs Polyisocyanates hydrophiles Polyuréthanes Réticulants Revêtements bi-composant Revêtements en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Around 40% of the global industrial wood coatings market is based on traditional solvent-borne polyurethane technology. Water-borne polyurethane systems are high performance and en-vironmentally compatible but their in-herently slower drying has limited the market shift towards this low emission alternative. A novel hybrid hydrophilic polyisocyanate offers a fast-drying and promising solution. Note de contenu : - Hardener is key to developing fast crosslinkers - Novel HDI-TDI hardener for faster curing of 2K WB systems - Anionic hydrophilisation proves effective - Aromatic content - Faster cure with minimal compromise - Drying time comparable to 2K SB standard - More environmentally friendly solutions now possible - Fig. 1 : Gloss and haze of two different 2K WB systems based on standard hydrophilic polyisocyanate or the novel H01/1-131 based one - Fig. 2 : Drying lime comparison at room temperature [23°C, 50 % RH) of different 2K WB coatings (based on secondary and pri¬mary acrylic polyol and two different hardeners) according to OIN 53150, 120 g/m2 on glass. Total dry [TLI] of 2K WB systems can be reduced by half compared to a standard system when using the novel hardener - Fig. 3 : Hardness evolution of coatings based on different polyols combined with bath hardeners. New development shows faster hardness evolution Chan homologue HDI type - Fig. 4 : Drying and hardness evolution of coatings based on OH-functional PUD and different hardeners. The novel PIC shows (aster hardness evolution Chan homologue HDI type - Fig. 5 : Comparison of yellowing under natural light [under glass 45-e oriented south] from coatings based on new hardener and standard types [aliphatic and aromatic] - Table 1 : Technical data of novel aliphatic-aromatic hydrophilic polyisocyanate - Table 2 : Effect of increasing aromatic content [from left to right] in hydrophilic polyisocyanates on 2K WB coating based on second¬ary acrylic polyol and different hardeners - Table 3 : Comparison of different coahing properhies based on novel hardener vs. standard 2K 5B formulation En ligne : https://drive.google.com/file/d/1-V4_TKhiqBCxfpPzw777iAw0337-4o6N/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32905 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21176	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Two component waterborne polyurethane topcoat for bridges / Mangesh Sidam in PAINTINDIA, Vol. LXXI, N° 11 (11/2021)  

[article]  inPAINTINDIA > Vol. LXXI, N° 11 (11/2021) . - p. 66-72 Titre : Two component waterborne polyurethane topcoat for bridges Type de document : texte imprimé Auteurs : Mangesh Sidam, Auteur ; Shweta Gupta, Auteur Année de publication : 2021 Article en page(s) : p. 66-72 Langues : Anglais (eng) Catégories : Durée de vie en pot Polyisocyanates hydrophiles Polyuréthanes Revêtements -- Finition Revêtements bi-composant Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : This article introduces the basic principles of two-component waterborne polyurethane coatings and its applications for walls, floors and in infrastructures. It also presents the results based on intensive lab evaluations with different combinations of polyol dispersions and hydrophilic polyisocyanates for performance adjustment in order to meet different performance and cost requirements as well as based on real time success cases. Two component waterborne PU based topcoat can be used both on wall as well as on floor coating in various applications such as hospitals, schools & kindergartens, electronic plants, food processing workshops, kitchens, warehouses, car parking, bridges etc. due to its excellent performance such as abrasion resistance, easy-to-clean, stain and scratch resistance and weathering resistance. Note de contenu : - Basic reactions - Hydrophilic polyisocyanates - NCO/OH ratio - NOC reacting with water - Pot life - Tough but flexible - Stain resistance/dirt pick up resistance - Fungus/algae resistance - Tire staining - Real life cases : Bhumiphol bridge, Thailand En ligne : https://drive.google.com/file/d/1Cjh71G8Tc35_xOFlkWRRaN4L7RYFDE-w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37107 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23261	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Waterborne wood coatings made easy / Maria Almató in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4619 (04/2016)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4619 (04/2016) . - p. 16-20 Titre : Waterborne wood coatings made easy Type de document : texte imprimé Auteurs : Maria Almató, Auteur ; Eva Tejada, Auteur ; Joan Miquel García, Auteur Année de publication : 2016 Article en page(s) : p. 16-20 Langues : Anglais (eng) Catégories : Bois -- Revêtements Formulation (Génie chimique) Hydrophilie Polyacryliques Polyéthers Polyisocyanates hydrophiles Polyuréthanes Résistance chimique Vernis bi-composant Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne wood coatings have become more and more copuler in the recent years, especially due to the increasing environmental and health concerns, as well as the strong legislative restrictions in terms of VOC taken in some regions. Thanks to the important efforts made in terms of research and development, some of the newest products are matching the standard traditional systems with a minimal environmental impact. However, there are still some drawbacks to overcome, such as the versatility and ease of use of these traditional solventborne systems. The wood coatings industry is an industry in which you can still find a quite significant number of craftsmen and small- and medium-sized carpenters and applicators. Reliability, versatility and easy handling are very important for all the industry but these become crucial when it cornes to smaller companies. These and other topics have been addressed by our R&D, resulting in two new products with a single aim: enabling the wood coatings formulators and applicators to switch to waterborne. Note de contenu : - Waterborne coatings - A new ready-to-use hydropholic polyisocyanate hardener - A new self-crosslinking acrylic dispersion for 1K and 2K systems En ligne : https://drive.google.com/file/d/1aSB3zlda69D4iSMfVOmGJTniiL3X0MSz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26124 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
17963	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 4 / 4)