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Greener manufacturing process for chain stopped alkyd paint / Maryam Amra Jordaan in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4641 (05/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4641 (05/2018) . - p. 16-24 Titre : Greener manufacturing process for chain stopped alkyd paint Type de document : texte imprimé Auteurs : Maryam Amra Jordaan, Auteur ; Thembeka Samkelisiwe Dlamini, Auteur ; Michael M. Shapi, Auteur Année de publication : 2018 Article en page(s) : p. 16-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Automobiles -- Revêtements:Automobiles -- Peinture Dispersions et suspensions Essais (technologie) Fourier, Spectroscopie infrarouge à transformée de Polyalkydes Réflexion totale atténuée Rhéologie Solubilité Surfactants Index. décimale : 667.6 Peintures Résumé : The current process of CSAP manufacture is an environmentally hazardous process, which leads to toxic heavy metal accumulation in industrial effluent and increased VOC emissions. The research conducted modified this process by replacing both the HSF technology with HSD technology and substitution with a more compatible organoclay. The modified organoclay exhibited the intercalation of cationic surfactant between the clay layers and thus, changed the surface properties from highly hydrophilic to increasingly hydrophobic. In addition, modification of the swelling clay with cationic surfactant results in an increase in the basal or interlayer spacing of the layer and exposure of new sorption sites of clay. This modification allows a lower viscosity and better dispersion with the moderately polar solvent system used in the formulation. The viscosity vs time results additionally illustrated that although the HSD system produced FOG particles larger than those of the HSF system and used less solvant over time, the HSF system produced CSAP that was more viscous and the smaller FOG particle size caused electrostatic tension in the paint suspension ie syneresis. The larger FOG particle size from the HSD system essentially contributed to paint stability. The improved CSAP manufacturing process achieved a substantial lower volume of solvent, which can also be recycled. Further research includes the application of solid-state NMR to further analyse the complexity of these organoclays in determining solubility limitations. Note de contenu : - EXPERIMENTAL : Materials - Procedure - Attenuated Total Reflectance FTIR (ATR-FTIR) - Mass data - RESULTS AND DISCUSSION : FTIR data - Solubility in polar and non-polar solvents - Viscosity testing - FIGURES : 1. HSF (Highest Speed Fluidar) schematic (supplied by the undisclosed paint company) - 2. HSD (Highest Speed Disperser) schematic (supplied by the undisclosed paint company) - 3. Chain stopped alkyd resin FTIR spectrum - 4. Polar organoclay FTIR spectrum - 5. Moderately non-polar organoclay FTIR spectrum - 6. Non-polar solvent FTIR spectrum - 7. Cream sample viscosity vs time graph, (40°C oven samples in fig. 7-16) - 8. Organic red sample - 9. Inorganic red sample - 10. Organic yellow sample - 11. Inorganic yellow sample - 12. Orange sample - 13. Green sample - 14. Blue sample - 15. Brown sample - 16. Grey sample - 17. Intercalation of alkyl ammonium cations in between montmorillonite clay silicate layers - 18. Steric stabilisation caused by the surfactants - 19. Electrostatic stabilisation - 20. Sag panel (ail sag) and HSF vs HSD panels (pass sag) - TABLES : 1. Experimental procedure - 2. Average percentage yield for both HSD and HSF technology - 3. FTIR absorption data for the 3 different types of clays - 4. Spontaneous solubility results - 5. HSD and HSF particle size and CSAP performance data - 6. Viscosity stability table results En ligne : https://drive.google.com/file/d/1QCOLd39kQBgGn7YUZAJdHMGfKpENvD9s/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30620 [article]

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Self-healing metal oxides could protect against corrosion / David Chandler in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4641 (05/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4641 (05/2018) . - p. 27-29 Titre : Self-healing metal oxides could protect against corrosion Type de document : texte imprimé Auteurs : David Chandler, Auteur Année de publication : 2018 Article en page(s) : p. 27-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine Anticorrosifs Anticorrosion Métaux -- Revêtements protecteurs Revêtement autoréparant Index. décimale : 667.9 Revêtements et enduits Résumé : Researchers at MIT have found that an ultra-thin layer of aluminium oxide, though solid, can flow like a liquid instead of cracking. A solid oxide protective coating for metals can, when applied in sufficiently thin layers, deform as if it were a liquid, filling any cracks and gaps as they form. The thin coating layer should be especially useful to prevent leakage of tiny molecules that can penetrate through most materials, such as hydrogen gas that could be used to power fuel-cell cars, or the radioactive tritium (a heavy form of hydrogen) that forms inside the cores of nuclear power plants. Most metals, with the notable exception of gold, tend to oxidise when exposed to air and water. This reaction, which produces rust on iron, tarnish on silver and verdigris on copper or brass, can weaken the metal over time and lead to cracks or structural failure. But there are three known elements that produce an oxide that can actually serve as a protective barrier to prevent any further oxidation: aluminium oxide, chromium oxide and silicon dioxide. Note de contenu : - Environmental transmission electron microscope used - Aluminium oxide studied - Figure : Reserachers have found that a solid oxide protective coating for metals can, when applied in sufficiently thin layers, deform as if it were a liquid, filling any cracks and gaps as they form En ligne : https://drive.google.com/file/d/1qGlYQnAOuZ6JqYLqtc61QLLLVQm9HIKR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30621 [article]

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Dragonfly-inspired nano coating kills bacteria upon contact in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4641 (05/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4641 (05/2018) . - p. 28-29 Titre : Dragonfly-inspired nano coating kills bacteria upon contact Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 28-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Matériaux hybrides Oxyde de zinc Poudres Revêtements protecteurs Surfaces antimicrobiennes Index. décimale : 667.9 Revêtements et enduits Résumé : Studies have shown that the wings of dragonflies and cicadas prevent bacterial growth due to their natural structure. The surfaces of their wings are covered in nanopillars making them look hke a bed of nails. When bacteria come into contact with these surfaces, their cell membranes get ripped apart immediately and they are killed. This inspired researchers from the Institute of Bioengineering and Nanotechnology (IBN) of A*STAR in Singapore to invent an anti-bacterial nano coating for disinfecting frequently touched surfaces, such as door handles, tables and lift buttons. This technology will prove particularly useful in creating bacteria-free surfaces in places like hospitals and clinics, where sterilisalion is important to help control the spread of infections. Their new research was recently published in the journal Small. Note de contenu : - Need for a better way to disinfect surfaces - Fig. 1 : Zinc oxide nanopillars that looked like a bed of nails can kill a broad range of germs when used as a coating on frequently-touched surfaces - Fig. 2 : E coli bacteria destroyed by the anti-bacterial coating made from zinc oxide nanopillars En ligne : https://drive.google.com/file/d/1jev1bHbUyywFwjtpS10vVyIUVzwJ4OmG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30622 [article]

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Pushing boundaries for the environment / Dale Banton in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4641 (05/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4641 (05/2018) . - p. 44-45 Titre : Pushing boundaries for the environment Type de document : texte imprimé Auteurs : Dale Banton, Auteur Année de publication : 2018 Article en page(s) : p. 44-45 Langues : Anglais (eng) Catégories : Matériaux cimentaires -- Revêtements protecteurs Revêtements de sols industriels Index. décimale : 667.9 Revêtements et enduits Résumé : The flooring industry faces increasing pressures from the regulatory authorities and the government for environmentally-friendly products throughout the supply chain. At the saine time, the rise in complex building designs, new materials and tougher specification, brings increased expectations from architects and specifiers who want to know they can meet these new levais of compliance without compromising design and safety. The use of epoxy and polyurethane resins for industrial and commercial premises makes concrete exceptionally durable and offers robust protection, especially for food and beverage and pharma environments. The priorities of the high-tech manufacturing and industrial processing sectors are increasingly focusing on improving quality, hygiene and safety, with emphasis on creating stringently clean production environnnents. When it cornes to applying new or refurbished flooring or wall coatings, the requirement is to create a safer workplace for employees, reduce risk of odeur or tainting in the production process while at the saure time keeping any disruption to working operations to a minimum. Note de contenu : - Specific requirements - A breakthrough using science - Comprehensive and rigorous trials - Diverse industry demands En ligne : https://drive.google.com/file/d/1FrHzef6r3dyuce2eUS3LZMrtYisKZS3v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30623 [article]

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Polymer Paint Colour Journal - PPCJ Vol. 208, N° 4641 URL