Investigating the effect of glass flakes on performance of high-build epoxy coating for splash zone application / Nirmalya Dey in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4674 (04/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4674 (04/2022) . - p. 16-22 Titre : Investigating the effect of glass flakes on performance of high-build epoxy coating for splash zone application Type de document : texte imprimé Auteurs : Nirmalya Dey, Auteur ; Dhembare Dhembare, Auteur Année de publication : 2022 Article en page(s) : p. 16-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Anticorrosifs Anticorrosion Charges (matériaux) Epoxydes Formulation (Génie chimique) Métaux -- Revêtements protecteurs Particules (matières) Peinture -- Propriétés physiques Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements organiques Rhéologie Test d'immersion Verre Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Glass flake epoxy coatings are most commonly used to protect splash zone areas of offshore assets. The splash zone area is a highly corrosive area due to exposure to the wet and dry atmospheric cyclic process. In addition, splash zones and heavy-duty decks also experience high impact and abrasion which can cause faster loss of integrity of non-glass flake coatings. Glass flakes (GF) impart unique properties to epoxy coatings when compared with traditional or granular fillers. Level of loading and aspect ratio of GF in the formulation has a critical effect on coating performance. Hence, high level of caution needs to be taken while choosing GF, considering its particle size and thickness. In this paper, the changes in physical, mechanical, barrier and anticorrosion properties with variation of type and dosage of GF in high-build pigmented epoxy coatings for splash zone areas, are investigated. Electrochemical impedance spectroscopy (E15) and water vapour transmission (WVT) tests were used for checking performance of coatings related to barrier protection. The results of EIS correlate well with those of WVT rate measurement and the SEM images were found to be helpful for understanding the GF orientation in the matrix. From the whole study it was concluded that the GF of higher flake size and aspect ratio and at 10% loading level in the coating formulation give the best barrier property, whereas GF with lower flake size and aspect ratio and at 10% loading level give the best corrosion resistance, mechanical strength and physical properties like viscosity build up and sag resistance. The valuable information derived from these experiments is expected to generate better insight into the influence of GF types and their loading level on performance parameters of high-build epoxy coatings. Note de contenu : - INTRODUCTION : Why GF ? - Chemistry of GF - Type of glass - EXPERIMENTAL : Materials - Methods - Surface morphology of paint fils by SEM - Physical properties of liquid paints samples - Mechanical properties - Barrier properties - Chemical immersion test - Corrosion resistance - RESULTS AND DISCUSSION : Surface morphology of GF in the epoxy coating by SEM - Physical properties of liquid paint - Results of mechanical test of the dried coating - Evaluation of barrier properties - Result of immersion resistance and corrosion resistance - Table 1 : Physical characteristics of resins - Table 2 : Physical and chemical properties of different glass flakes - Table 3 : Formulation parameters of 2K splash zone epoxy coating - Table 4 : Percentage of GF used in experiments - Table 5 : Viscosity measured by penetrometer - Table 6 : Effect of GF on sag resistance of coating - Table 7 : Initial pull off adhesion value - Table 8 : Weight loss in abrasion resistance test - Table 9 : Weight loss in water vapour transmission test - Table 10 : Impedance reading of experiments En ligne : https://drive.google.com/file/d/1rEbykEosuPfh2BYnL3KSsBRwdxYew7Zn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37389 [article]

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Mitigation of marine fouling growth through TBT free antifouling coating - A review / Nirmalya Dey in PAINTINDIA, Vol. LXI, N° 11 (11/2011)

[article]  inPAINTINDIA > Vol. LXI, N° 11 (11/2011) . - p. 61-67 Titre : Mitigation of marine fouling growth through TBT free antifouling coating - A review Type de document : texte imprimé Auteurs : Nirmalya Dey, Auteur Année de publication : 2011 Article en page(s) : p. 61-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Copolymères Revêtement autopolissant Revêtements antisalissures:Peinture antisalissures Salissures marines Tributylétain -- Suppression ou remplacement Index. décimale : 667.9 Revêtements et enduits Résumé : Foulings of marine crafts led to the development and widespread use of antifouling paints in the hulls of boats and ships. Fouling costs shipping industry approximately $ 3 billion per annum. Conventional antifouling paints with tributyltin based toxin have served the industry for past 2-3 decades with excellent performance and track record. However antifouling coatings based on organotin compounds possess a world-wide threat to the aquatic environment due to which International Maritime Organization (IMO) have imposed ban on the presence of tin on seagoing vessel effective 2008. This had led to the evolution of several new generation nontoxic environmentally safe antifouling coating systems. Globally researchers and scientists have approached technically in different ways to develop more eco-friendly antifouling coatings. This paper reviews the process of bio-foulings on ships' underhull and the categories of different TBT free anti-fouling-paints. Note de contenu : - PROCESS OF MARINE BIO FOULINGS - PARAMETERS EFFECT ON BIO FOULING GROWTH : Geographical location - Operating pattern of the vessel/speed - Temperature of water - Salinity/pH/alkalinity - Pollution and oil-grease contamination in coastal water - Review of conventional anti-fouling paint - Soluble matrix type-first generation antifouling - Diffusion or, insoluble matrix type or, contact leaching, second generation antifouling - Controlled depletion type (CDP) third generation antifouling - TBT based self-polishing copolymer (SPC)- fourth generation antifoulings - NEW GENERATION TIN FREE ANTIFOULING : TBT free self-polishing copolymer (SPC) - Biocidal free foul release Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13822 [article]

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Recent advances in isocyanate free coating technologies as an alternate to hazardous isocyanate cured polyurethane coating / Sangram Ghosh in PAINTINDIA, Vol. LXVII, N° 6 (06/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 60-70 Titre : Recent advances in isocyanate free coating technologies as an alternate to hazardous isocyanate cured polyurethane coating Type de document : texte imprimé Auteurs : Sangram Ghosh, Auteur ; Nirmalya Dey, Auteur Année de publication : 2017 Article en page(s) : p. 60-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Durée de vie (Ingénierie) Polyaldéhyde Polycarbamate Revêtements sans isocyanates Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Isocyanate based polyurethane (PU) paints are well established in the coating world. PU coatings are characterized by their excellent durability, toughness, chemical resistance and stain resistance. PU coatings are used in various fields of applications such as in marine and protective coating, general industrial coatings, automotive coatings and even in architectural coating segments. However, various health, safety and environmental (HSE) legislations are limiting the use of isocyanate due to its toxicity related hazards. Also the use of renewable and green resources is gaining importance as the paint industry is gradually shirting towards eco-friendly and sustainable developments. ln this scenario non-isocyanate polyurethane and other isocyanate free coating technologies are creating a new way of thinking for the paint industry especially for ambient cured system. Few coating manufacturers have already developed and established their products based on isocyanate free chemistry. In this article, various technological approaches and recent advancements in this field have been reviewed in detail. Performance of these new chemistries in comparison to conventional isocyanate based PU has also been covered. It is expected that, the use of isocyanate free coating technology will usher a new way of sustainability for the paint industry. Note de contenu : - STATE-OF-THE-ART IN CONVENTIONAL PU COATING : Two pack airdrying polyurethane - Single pack moisture cured PU - TOXICITY AND HAZARDS ASSOCIATED WITH ISOCYANATE EXPOSURE - DEVELOPMENTS IN ISOCYANATE FREE POLYURETHANE CHEMISTRY AND OTHER ALTERNATIVE TOPCOATS : Non-isocyanate polyurethane (NIPU) - NIPU formation reaction - hybrid non isocyanate polyurethane (HNIPU) - Renewable resource based NIPU - Use in NIPU in coatings - Use of HNIPU as sealants and floor coating - Use of HNIPU as sprayable PU foam - Isocyanate free polyurethane using polyaldehyde and polycarbamate - Key features of polyurethane obtained from polyaldehyde and polycarbamate - Alternate isocyanate free coating using malonate and acrylol - Pot life inhibition problem associated with Michael reaction - Acure technology - Comparison of acure with with conventional isocyanate based coating En ligne : https://drive.google.com/file/d/1kO3hDgwTyH6_9FYvteE2dbPYfpvZLxSn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28979 [article]

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Rheological studies of two component high build epoxy and polyurethane based high performance coatings / Ajit Deka in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 3 (05/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 3 (05/2013) . - p. 305-315 Titre : Rheological studies of two component high build epoxy and polyurethane based high performance coatings Type de document : texte imprimé Auteurs : Ajit Deka, Auteur ; Nirmalya Dey, Auteur Année de publication : 2013 Article en page(s) : p. 305-315 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Polyuréthanes Revêtements bi-composant:Peinture bi-composant Rhéologie Index. décimale : 667.6 Peintures Résumé : The work presented in this article involves the study of rheometric profile of several rheological additives in two-component (2K) high build epoxy zinc phosphate primer and two-component high build aliphatic polyurethane topcoat. Viscosity profile and thixotropic behavior at different shear rates have been determined for both the paints using Physica MCR 301 Rheometer of Anton Paar. The valuable information derived from these measurements led to better insight into the influence of these rheological additives on important paint properties like flow and leveling, sag control, in-can settling during storage, etc. Rheometric results were also compared with the results obtained during the actual application of these experimental coatings on mild steel panels. From the rheological study it was concluded that the thickeners based on surface-modified clay and organically modified castor oil derivative work well in epoxy zinc phosphate primer whereas polyurea-based thickener showed better results than other rheological additives in the case of the 2K polyurethane system. Measurement of low shear and high shear viscosity response of different thickeners helps in predicting storage and application behavior of these coatings which correlates well with the actual observation. DOI : 10.1007/s11998-012-9445-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9445-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18724 [article]

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