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Creating colour / Pablo Marroquin in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4633 (08/2017)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 207, N° 4633 (08/2017) . - p. 20-21 Titre : Creating colour : The author discusses the processing of red iron oxide pigments Type de document : texte imprimé Auteurs : Pablo Marroquin, Auteur Année de publication : 2017 Article en page(s) : p. 20-21 Langues : Anglais (eng) Catégories : Oxyde de fer Rouge (couleur) Index. décimale : 667.2 Colorants et pigments Résumé : Pigments are materials that change the colour of transmitted or reflected light by reflecting a specific wavelength of light while absorbing other wavelengths. In other words, they separate light into different fractions, rejecting only the fraction of the specific colour of the pigment. Most pigments used are dry colourants, usually ground into a fine powder. The partiale size distribution (PSD) plays a very important role in how light reacts alter hitting a pigment. Due to their special characteristics, pigments are used as colouring in many different applications. For example, they are usect in paint, fabric and textiles, ink, food, plastics, cosmetics and many other applications. Pigments are milled very fine as the colouration intensity depends on the fineness of the materials. Hosakawa Alpine has a large variety of milling equipment to process pigments based on the relevant task. The process may be an effective size reduction (milling) if the pigment is, for example, a mineral pigment coming from a mine. It may also be a 'simple' de-agglomeration if the pigment comes from a chemical crystallisation process. It is also possible that the pigment already has the desired PSD and the milling equipment is only used to guarantee a final fineness. In the selection of the right milling equipment other factors also have to be considered, such as the material characteristics : tendency to stick, abrasiveness, hazard class and others. Hosakawa Alpine has developed the fluidised bed opposed jet mill AFG for ail of these challenges. The AFG mill has a high turbulence in the mill chamber with no temperature increase, making it the most suitable solution for sticky products. The mill chamber is easily accessible, making it very easy to clean. Note de contenu : - Processing pigments using AFG technology - Red iron oxide - Using hot gas - TABLES : 1. 400 AFG mill : Red iron oxide - 2. 400 AFG mill : Special effect pigment En ligne : https://drive.google.com/file/d/1Zz6DIsOWPfSJqhxHF-F3L62dO66Y53MG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28848 [article]

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Developing colour to its full potential / Loulou Rozek in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4633 (08/2017)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 207, N° 4633 (08/2017) . - p. 22-26 Titre : Developing colour to its full potential : The author discusses novel dispersants for optimum pigment dispersions Type de document : texte imprimé Auteurs : Loulou Rozek, Auteur Année de publication : 2017 Article en page(s) : p. 22-26 Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Pigments Index. décimale : 667.2 Colorants et pigments Résumé : The automotive and performance coatings industries have seen a significant shift from solvant to waterborne systems in recent years. This change has brought challenges to paint formulators. One of those challenges is producing colours ta match those of solvent systems in vibrancy and undertones, particularly with low surface functionality pigments such as perylene, phthalocyanine blues and high jet carbon black pigments. To overcome those challenges, novel dispersants with unique structure and chemistry have been developed to produce better colour performance and jetness than ever before in waterborne coatings. Understanding the relations between the dispersant's chemistry, structure and affinity to organic pigment surface will help the formulator net only optimise colour performance but also understand and control other parameters that are key to production efficiency, such as grind lime (energy) and grind viscosity (pigment loading). Note de contenu : - Structure of dispersants - Case study : PR 179 - Viscosity and viscosity stability - Case study : PBK7 - FIGURES : 1. Typical structures of polymeric dispersants - 2. Interaction of dispersant's polar groups with pigment surface polar sites - 3. Pigments with low surface functionalities - 4. Novel dispersants unique structure - 5. The electron rich body of novel dispersants creates a strong interaction with pigment surface - 6. Particle size of novel dispersant against benchmark - 7. Hunter L*a*b* values novel dispersant and benchmark - 8. PR 179 colour development over time with Disp. 1 and Disp. 2 - 9. Disp. 2 has higher gloss : at 0.5hr than Disp. 1 at four hr - 10. Viscosity initial and one month at RT - 11. Mean particle size over time and jetness over time - 12. 20° gloss and haze - 13. Three step viscosity (cPs) - TABLES : 1. Concentrate formulation, benchmark (Disp. 1) and novel dispersant (Disp. 2) - 2. Let-down in WB 2K PU systems - 3. Concentrate formulation, benchmark (Disp. 1) and novel dispersant (Disp. 2) - 4. Let-down in WB 2K PU system - 5. Jetness values for four PBK 7 En ligne : https://drive.google.com/file/d/1dh8chW48B9h7kwmffxg8a3-Lr5oMstJT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28849 [article]

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DTM polyaspartic urethane coatings stand the test of time in rail industry / Ahren Olson in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4633 (08/2017)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 207, N° 4633 (08/2017) . - p. 28-30 Titre : DTM polyaspartic urethane coatings stand the test of time in rail industry Type de document : texte imprimé Auteurs : Ahren Olson, Auteur ; Charles T. Williams, Auteur Année de publication : 2017 Article en page(s) : p. 28-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Automobiles -- Carrosseries Automobiles -- Revêtements:Automobiles -- Peinture Epoxydes Polyaspartiques Polyuréthanes Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Exterior railcar coatings will continue to require the correct balance of cost, long-term performance and productivity, while meeting current environmental regulations. DTM epoxy and acrylic coatings have provided this balance for railcar owners for many years. However, owners more concerned with the long-term aesthetics of their railcars typically require a multi-coat epoxy/PUR systems for the added UV resistance provided by the PUR topcoat. These multicoat systems can now be replaced with a DTM PAS coating system to reduce cost and improve productivity without having to sacrifice the long-term performance. This study documented the 15yr field performance of DTM PAS coatings versus an epoxy/PUR system. Both coatings systems have performed exceptionally well, exhibiting less than 0.1% rusting and are expected to last a total life cycle of 20-25yr before repainting. DTM PAS provides the required long-term performance af a two-coat system at a lower total applied cost. Compared to DTM epoxies and acrylics, DTM PAS is expected to provide 2-2.5x the coating life, which could remove two full painting cycles. Railcar owners will need to balance the removal of painting cycles versus the increased material cost of DTM PAS versus epoxies and acrylics. Note de contenu : - DTM pas railcar case study - Field performance after 15 years' service - FIGURES : 1. Hopper car being stencilled four hours after application of DTM PAS coating - 2. Excellent coverage on the pump - 3. Excellent coverage on hard to coat areas - 4. High gloss finish of dried DTM PAS coating moving into next bay - 5. Pictures of ar LUPX 60607. The DTM PAS coating is showing less than 0.1% rusting after 15yr of ewposure. Even on a rather poor weld (bottom left), the DTM PAS coating has penetrated well and is providing excellent corrosion protection - 6. Pictures of LUPX 60630. The epoxy/PUR two-coat system is performing excellently showing less than 0.1% rusting after 15 years in service En ligne : https://drive.google.com/file/d/1v1B3MKuMO3uhLs-nYQiIvP77L98jHoJI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28850 [article]

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Polymer Paint Colour Journal - PPCJ Vol. 207, N° 4633 URL