Improved durability through reactive dispersant technology / Steffen Onclin in COATINGS TECH, Vol. 15, N° 7 (07/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 7 (07/2018) . - p. 22-33 Titre : Improved durability through reactive dispersant technology Type de document : texte imprimé Auteurs : Steffen Onclin, Auteur ; Kou Huiguang, Auteur ; Rainer Diehl ; Elena Martinez ; Clemens Auschra ; Andrew Recker ; Anthony Moy Année de publication : 2018 Article en page(s) : p. 22-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie) Copolymère acrylique mélamine Copolymères séquencés Essai de dureté Essais dynamiques Granulométrie Noir de carbone Pâte pigmentaire Pigments Polymères à terminaison hydroxyle Polyuréthanes Revêtements -- Additifs:Peinture -- Additifs Rhéologie Vernis bi-composant Vernis en phase aqueuse Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Even though formulation additives comprise only a minor part of a coating formulation, they can have pronounced effects on the physical properties of the final coating. This is especially true for pigment dispersants, which can enter a coating formulation “under the radar” through, for example, pigment pastes.  As dispersants are often polar polymers with a low glass transition temperature, the interface between the pigment and continuous phase forms a weak point, especially in coatings designed for high durability. This article addresses the development of an improved dispersant technology. The dispersants are functionalized such that they become part of the continuous phase of the coating, improving overall film integrity. Application examples, in both waterborne and solventborne formulations, demonstrate the effects of reactive technology on mechanical and barrier properties in comparison to conventional systems. Note de contenu : - Effect of dispersants on coatings properties - Dispersant with new anchoring chemistry - Reducing negative impact of dispersants on coating properties - Towards waterborne reactive dispersants - Fig. 1 : Stabilization mechanisms of dispersants - Fig. 2 : Effect of exchanging part of grinding resin with dedicated dispersant (internal BM 1) on pigment paste rheology and transparecy in a solventborne MS OEM system. Values in brackets reflect dispersant dosage (active dispersant on pigment) - Fig. 3 : Pendulum hardness and MEK-rub test results of a solventborne MS-OEM basecoat after the addition of 20% pigment paste. Values in brackets reflect dispersant dosage (active dispersant on pigment). MEK-rubs were performed directly on the basecoat - Fig. 4 : Mill base viscosities, fresh and after two weeks at 50°C, as a function of dispersant dosage. Pigment pastes are resin-free and contain 13% carbon-black - Fig. 5 : Average particle size of pigment pastes as function of dispersant dosage. Particle size measurements were performed two days after pigment paste preparation - Fig. 6 : Schematic representation of working principle of analytical ultra-centrifuge - Fig. 7 : Dispersant adsorption in a solventborne, resin-free carbon black pigment paste, measured with an anlytical ultra-centrifuge. Effective (measured) dispersant on pigment is plotted againsf formulated dispersant on pigment - Fig. 8 : Jetness and undertone values in a medium-solids OEM basecoat. Coatings were applied on a glass substrate and measurements wre taker from the backside (through the glass) to reduce surface effects - Fig. 9 : Jetness and undertone values in a 2KPU topcoat. Coatings were applied on a glass substrate and measurements were taken from the backside (though the glass) to reduce surface effects - Fig. 10 : Schematic representation of co-reactive dispersant concept. The dispersant becomes part of the continuous resin phase to improve film integrity - Fig. 11 : Pendulum hardness and MEK-rub resistance of an MS-OEM basecoat. The MEK-rub test was performed directly on the basecoat - Fig. 12 : Pendulum hardness and chemical resistance of a 2KPU topcoat, containing 20% pigment paste. Chemical resistance after 16h exposure. Chemical resistance rating : 5 = no change, 1 = strong change/damage - Fig. 13 : Functionalization of block copolymer dispersants with hydroxyl-functional groups - Fig. 14 : Pigment paste rheology (fresh) of resin-free pigment concentrates containing 18% PBk 7 and a DOP level of 100%. Jetness and undertone in a WB 1K acrylic melamine topcoat, applied on glass, after mixing with 20% pigment paste. Measurements were taken from the backside (though the glass) - Fig. 15 : Pendulum hardness of WB 1K acrylic melamine topcoat containing 20% of carbon black pigment paste - Fig. 16 : Chemical resistance of a 1k acrylic melamine topcoat, containing 20% pigment paste. Data after 16h exposure. Chemical resistance rating : 5 = no change, 1 = strong change/damage En ligne : https://drive.google.com/file/d/1CDNJI6SBFF_mE-AMpYjliE_s5klSpHDp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31209 [article]

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Mathematics in paint technology - X / Mukund Hulyalkar in PAINTINDIA, Vol. LXIV, N° 5 (05/2014)  

[article]  inPAINTINDIA > Vol. LXIV, N° 5 (05/2014) . - p. 88 Titre : Mathematics in paint technology - X : Calculations related to paint machinery Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2014 Article en page(s) : p. 88 Langues : Anglais (eng) Catégories : Broyeurs à billes Colorants Dispersions et suspensions Mathématiques Pâte pigmentaire Revêtements -- Appareils et matériels:Peinture -- Appareils et matériels Index. décimale : 667.6 Peintures Résumé : Attritor is a via media between Bali Mill and a Batch type Sand Mill/Bead Mill. Dispersion time is approximately 2 - 3 hours, i.e. one tenth time required by Bali Mill. This is a best machine for ail types of primers. Major wear & tear is of the fingers only and hence, maintenance cost is low. Author recommendsthis machine can be best used for making homopaste, stainers, machine colourants etc, as there is no foam generated because of low speed. Very good tentorial strength is developed which can be achieved with dispersion time and momentum of grinding media instead of using traditional machines like kneader and triple roll mills. En ligne : https://drive.google.com/file/d/1ERAjPuqFZcSVUUfftv73x-LsfCrukWVt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40373 [article]

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Meeting IKEA R1 requirements for coatings / Dirk Mestach in EUROPEAN COATINGS JOURNAL (ECJ), N° 12 (12/2022)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 12 (12/2022) . - p. 38-42 Titre : Meeting IKEA R1 requirements for coatings : Water-borne one-component self-crosslinking polymer dispersions Type de document : texte imprimé Auteurs : Dirk Mestach, Auteur ; Marcel Meeuwisse, Auteur ; Nicole Verhagen, Auteur ; Ankie van Gorkum, Auteur Année de publication : 2022 Article en page(s) : p. 38-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Auto-réticulation Blanc (couleur) Pâte pigmentaire Polyacryliques Revêtement monocomposant Revêtements en phase aqueuse Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Concern about sustainability and carbon footprints is increas¬ing demand for one-component coating systems compliant with DIN 68861 and the IKEA 105 MAT 0066. A coating composition has been developed, combining crosslinking chemistries and particle morphology. Increased crosslink density results in IKEA-compliant pigmented matt coatings. Identical performance properties can be achieved using raw materials, resulting in concentrations of bio-based carbon above 30 %. Note de contenu : - Prior research - Crosslinking mechanisms - Covalent and ionic crosslinking - Experimental - Test methods - Best compromise - Table 1 : different experimental acrylic dispersions - Table 2 : Pigment paste and matt white topcoat composition - Table 3 : Comparison between second generation R2 dispersions with completely fossil or partiall renewable monomers En ligne : https://drive.google.com/file/d/16CIXJzVEX8NDYhjgpKriIXpPqBwxDFnV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38530 [article]

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New pigment carrier / Peter Denkinger in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4491 (08/2005)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4491 (08/2005) . - p. 18-22 Titre : New pigment carrier Type de document : texte imprimé Auteurs : Peter Denkinger, Auteur ; Andreas Wenning, Auteur Année de publication : 2005 Article en page(s) : p. 18-22 Langues : Anglais (eng) Catégories : Additifs Cétones Colorimétrie Couleurs -- Stabilité Dispersions et suspensions Pâte pigmentaire Pigments Résistance aux conditions climatiques Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Index. décimale : 667.2 Colorants et pigments Résumé : Synthetic Resin TC is a good carrier for universal pigment pastes. Synthetic Resin TC is a special ketone condensation resin. It is used as a carrier resin for pigment concentrates due to its universal solubility and compatibility and excellent pigment wetting. In addition, Synthetic Resin TC is suitable as an additive resin for improving certain properties such as hardness, gloss and adhesion, and for increasing the solids content in a variety of coating systems. This study gives a comparison of Synthetic Resin TC with an industrial standard in pigment pastes. Note de contenu : - Dispersion resins - Chemistry of synthetic resins - Resin properties - Practical applications with synthetic resins - Pigment pastes - Mechanical and colour properties of coatings - Stability and tinting strength - Weather resistance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27626 [article]

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Pigment dispersion II, testing / Clifford K. Schoff in COATINGS TECH, Vol. 17, N° 7 (07/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 56 Titre : Pigment dispersion II, testing Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2020 Article en page(s) : p. 56 Langues : Américain (ame) Catégories : Dispersions et suspensions Essais (technologie) Floculation Pâte pigmentaire Pigments Taille des particules Index. décimale : 667.2 Colorants et pigments Résumé : Pigment dispersion quality in pastes and paints may be tested by one of several different techniques. Probably the most common method in labs and plants is taking readings with a grind gauge, usually the Hegman type (ASTM D1210). The main reason for doing this for pastes usually is to see whether the dispersion process has reached the required end point for that pigment. Another reason would be to find out whether the dispersion equipment was adequate to achieve the target reading in a reasonable length of time. Hegman readings of 6 and 7 correspond to particle sizes of 25 and 12.5 mm, respectively, yet the average pigment particle size will be a fraction of that, perhaps as little as 1/10th. With a grind gauge, we only see the boulders, the largest particles (aggregates, agglomerates). Beginners find grind gauges frustrating to use and their precision is poor, but experienced users can produce rapid, repeatable, and meaningful results. Note de contenu : - Fig. 1 : Photomicrograph of a pigment paste. Almost no individual particles are visible - Fig. 2 : Paint made from the above paste. Individual particles are discernible along with loose clumps, which were easy to disperse En ligne : https://drive.google.com/file/d/1EzjVGBicVAL1b0D2_47N6mgIPlZly_Kl/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34344 [article]

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The effect of different radiation sources for the UV curing of a screen-printed, water-based polyurethane acrylate binder / Gökhan Akbulut in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)  

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