It takes effort to look this good / Pierre Leger in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2020)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 3 (03/2020) . - p. 32-37 Titre : It takes effort to look this good : Towards best practice in a snail trail-free exterior architectural paint Type de document : texte imprimé Auteurs : Pierre Leger, Auteur ; Ashley Gong, Auteur ; Alan Piwowar, Auteur Année de publication : 2020 Article en page(s) : p. 32-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Applications extérieures Lixiviation Revêtements -- Défauts:Peinture -- Défauts Revêtements en bâtiment:Peinture en bâtiment Surfactants Index. décimale : 667.9 Revêtements et enduits Résumé : Snail trail, also referred to as surfactant leaching, is a complicated matter for architectural paint formulators. These coatings demand a high-quality visual appearance but weather conditions and water-soluble ingredients can cause unexpected failuers. This article discusses the three main causes of snail trail and suggests ways to optimise paint formulations and improve drying speed and film formation to limit this issue. Note de contenu : - What is snail trail ? - Drying speed and paint composition influence surfactant leaching - Three mechanisms determine change in appearance - Crystal formation - Pooling of materials - Colour change - Composition of exudate - Importance of film formation - Possible routes to limit snail trail - Targeted strategies to reduce snailtrail - Table 1 : Leachate i water analysis (HPLC-ELSD) and surfactant leaching ratings - Fig. 1 : Factors influencing snail trail - Fig. 2 : Optical image showing snail trails from a white paint onto a black substrate and scanning electron micrographs showing two different types of crystal formation - Fig. 3 : Optical image of a paint surface after a drop of water evaporated, scanning electron micrograph of the optical impage highlighting a concentration of inorganic material (dark regions) near the edge of the droplet and 2D molecular representation of the droplet by ToF-SIMS showcasing an enrichment of exudate at the edge of the droplet En ligne : https://drive.google.com/file/d/1jS-kOCfzuiVFp3v26Ych7pcqNVSvjYuz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33896 [article]

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Modern formulations for architectural paints / Vicky James in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 201, N° 4558 (03/2011)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 201, N° 4558 (03/2011) . - p. 31-32 Titre : Modern formulations for architectural paints Type de document : texte imprimé Auteurs : Vicky James, Auteur ; Pierre Leger, Auteur Année de publication : 2011 Article en page(s) : p. 31-32 Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Polymères en émulsion Revêtements en bâtiment Revêtements en phase aqueuse:Peinture en phase aqueuse Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.6 Peintures Résumé : Latest developments in two silicone based additives, which comply with VOC regulations. Note de contenu : - Improving the durability of architectural paints - Adding to waterborne - Decorative applications - Controlling foam in waterborne architectural paints En ligne : https://drive.google.com/file/d/1ft8pXmuxcuJLEYx8vg03Vf-RVx8Txou2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11139 [article]

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Next generation additive performance - modern formulations for decorative paints and coatings / Vicky James in PAINTINDIA, Vol. LXII, N° 4 (04/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 4 (04/2012) . - p. 65-69 Titre : Next generation additive performance - modern formulations for decorative paints and coatings Type de document : texte imprimé Auteurs : Vicky James, Auteur ; Pierre Leger, Auteur Année de publication : 2012 Article en page(s) : p. 65-69 Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Qualité -- Contrôle Revêtement mural:Peinture murale Revêtements -- Additifs:Peinture -- Additifs Revêtements décoratifs:Peinture décorative Revêtements en bâtiment:Peinture en bâtiment Index. décimale : 667.9 Revêtements et enduits Résumé : Trends in the decorative market are strongly driven by two sources today. The first driver is legislation, where compliance to Volatile Organic Compounds (VOC) regulations is non-negotiable and is forcing formulators to look carefully at all their ingredients (including additives) to control VOC to low levels (<50g/l). The second driver, and arguably the most important, is the end consumer, who are asking for longer lasting,better performing products from the OEM producers and additionally easier to use products thar are "less harmful" to themselves and their families in the Do-It-Yourself market - this could mean lowder odor,less solvent or quicker drying for example - and there is an ever growing popularity of "eco" brands in the market. For home-use architectural paints, the good hiding power, good wetting and low dirt pick-up is important to the end user. The desire to achieve better hiding power of paints results in an open film with high PVC (Pigment Volume Concentration which often has limitations with respect to water resistance, weter beading and dirt pick-up. For wood coatings, water resistance is also an extremely important attribute to prevent peeling and cracking but also to maintain the aesthetics of the coatings. OEM applied wood coatings also require anti-blocking resistance during production, storage and shipping to prevent damage to the goods. This paper demonstrates how silicone chemistry can help formulator meet both the environmental and performance demands of the end consumer, giving the formulator possibilities to differentiate their product line or indeed achieve the same performance of current commercial paints or coatings more economically. In doing so they are also meeting the necessary legislative regulations. Dow Corning 87 Additive and Dow Corning 88 Additive are new silicone-based additives which bring differentiated performance to the en user - we will demonstrate how, at low levels (typically 2-5%) these additives impart good water resistance, and we will sho examples in architectural paints compared to the incumbent silicone resin emulsion technology (typically used at 5-10%). Dow Corning 87 additives will also impart water beading, a property typically perceived by the end user as meaning excellent water resistance, giving a 2-in-1 additive option and simplifying the formulation. Lastly we will show the possibilities to bring a anti-blocking as a secondary attribute to wood coatings. Whilst we endeavor to provide the requirements of the end user, of course we also to consider the needs of the formulator during the paint making process ! They too have needs to meet, especially with respect to foam control, which cancause problems during the manufacturing and filling processes. In this paper we will also show how Dow Corning 62 Additive and Dow Corning 68 Additive -highs solids silicone emulsions - can be used at lower addition levels to achieve good foam control. Finally all these attributes must come at an afordable cost. We will demonstrate the effectiveness of the various Dow Corning additives at low addition levels in the paint to reach this final goal. Note de contenu : - Improving the durability of architectural paints - Dow Corning 87 additive and Dow Corning 88 additive - Anti-blocking in wood coatings - Controlling foam in decorative paints and coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14752 [article]

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