Silicone-based pH-adjuster : high efficiency, odourless and zero-VOC / Pedro Lazzarin Marani in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4624 (09/2016)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4624 (09/2016) . - p. 18-20 Titre : Silicone-based pH-adjuster : high efficiency, odourless and zero-VOC Type de document : texte imprimé Auteurs : Pedro Lazzarin Marani, Auteur Année de publication : 2016 Article en page(s) : p. 18-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amino-alcools Copolymère styrène acrylique Copolymère vinyle acrylique Ester vinylique de l'acide versatique Méthylsiliconate de potassium pH Revêtements -- Additifs:Peinture -- Additifs 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 : 667.9 Revêtements et enduits Résumé : One of the biggest challenges that the coatings industry is currently facing is to ally a good product performance with sustainability, without impacting formulation costs. Several raw materials are available in the market, providing these two key factors to decorative coatings, although some components in a formulation interact with each other, affecting negatively its individuel effects. Among these components, there is the pH adjuster, as many of the existing products in the market have other side features that affect the performance of the resin, the dispersant, the defoamer and/or the biocide, among many others. In this context, the development of silicone-based pH-adjusters brought several advantages as a consequence of their high adjustment capacity, allying improved performance, formulation costs reduction and sustainability. Their main characteristic is to be odourless and zero-VOC products, making it possible to develop odourless coatings or tow-VOC coatings, one of the great challenges for the Brazilian coating manufacturers. Adding to that, due to its high pH value, around 14, these products have a high adjustment power, reducing up to 75% the pH adjuster dosage level, depending of the evaluated formulation. Besides being able to be used in several coatings systems (Styrene-Acrylic, Acrylic, Vinyl-Acrylic, VeoVA or VAE) and PVC levels, due to their silicone nature, these products also help in the film forming process, acting as a minor scale crosslinking agent, leading to improvements in the water resistance, scrub resistance and colour maintenance properties. Additionally, they present excellent results in storage stability and compatibility with several other raw materials, including but not restricted to biocides, defoamers and dispersants. Note de contenu : - Table 1. Comparative results obtained in laboratory betweenpotassium methylsiliconate and amino-alcohol - Table 2. Results obtained for styrene-acrylic systems (S-A) - Table 3. Results obtained for acrylic systems (A-A) - Table 4. Results obtained for vinyl-acrylic systems (V-A) - Table 5. Results obtained for VeoVA systems En ligne : https://drive.google.com/file/d/1bQ-vRdEsqjCoVH2mVCnEorGRViLuSAtl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27105 [article]

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