| Résumé : |
Associatively acting thickeners are standard in the formulation of modern aqueous systems, such as paints and coatings, adhesives, etc. These are either the hydrophobic-modified acrylic thickeners, often called HASE, or the NiSAT group of products. The term NiSAT, which is often used for this class of associative thickeners, refers to 'NonIonic Synthetic Associative Thickeners'.
The HASE product group comprises ionic (mainly anionic) thickeners, which require proper pH adjustment for activation. This product group utilises two mechanisms : water thickening and associative.
The NiSAT product group, as mentioned, are already nonionic and in principle can be used over the widest range of pH values. These products represent an advanced product technology and are designed to give superior rheological characteristics so that many formulation requirements can be met. Depending on the product chosen, good levelling, spatter resistance, film build and flow characteristics can be achieved. The appearance of classic syneresis can even be minimised. Furthermore, NiSAT products do not need special activation, so the majority of them can be added to the letdown or even at the end of processing. This product class does not adversely affect the corrosion or water sensitivity of the resulting system, and other secondary parameters, such as gloss, will not be negatively influenced. |
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Ajouter le résultat dans votre panier Affiner la rechercheAcrylic and acrylic/styrene copolymer dispersions in EUROPEAN COATINGS JOURNAL (ECJ), N° 3/98 (03/1998)
