MODAREZ® PW 363 Modarez® PW 363 is a polyacrylate based, VOC-free and silicon-free levelling additive for water borne coatings. It prevents from levelling problems and enhances surface appearance of coatings. During liquid coating application (spray-gun or brush application for example), many surface defects can occur. The surface may have waves (orange peel), craters, pin-holes… These imperfections are directly due to surface tension differences and can be corrected by using a levelling agent. How does it work? Levelling additives based on polyacrylates are not fully compatible with the liquid coating. This enables them to migrate at the liquid/air interface. Very often, they also have a high molecular weight that make them rather immobile at the surface. By positioning at the interface, the additive prevents from disparities in surface tension that can occur during application. It allows a better homogenization of this one at the liquid/air interface. This helps to reduce short waves phenomenon that gives an orange peel effect and smooth the surface of the coating. The levelling is therefore much improved. Illustration In a classical water borne white paint based on Acronal Eco 6716 (styrene-acrylic emulsion - BASF), 2 %* of Modarez® PW 363 is introduced under stirring. The paint is applied on aluminium Q-panels A35 using a 100µm K-coater. *2% delivery form on total formulation As illustrated on pictures bellow, using Modarez® PW 363 improves considerably the levelling and flow. In this case, it helps to minimize the marks of the applicator. MODAREZ® PW 363 Characteristics Polyacrylate levelling agents bring important Open time measurement properties in coatings: 35 - Reduce orange peel - Improve DOI 30 - Improve flow and levelling - Prevent from ghosting and clouding effect 25 - Prevent from craters, fish-eyes, pin-holes - Do not affect intercoat adhesion Time (min) 20 15 Modarez® PW 363 can also improve the open time, 10 without extending the drying time. This allows a better handling or a decrease of the level of coalescing agents 5 (see adjacent graph). Furthermore, Modarez® PW 363 presents wetting 0 Blank PW 363 properties as well. It can act as a co-solvent, or it can be Drying time 30 31 used as a grinding resin for pigment concentrates. As Open time 8 17 such it strongly develops colour strength. Water borne white paint based on Acronal Eco 6716 containing 2% Modarez® PW 363 VOC-free No negative Open time effect on improvment intercoat adhesion Modarez® PW 363 No negative Levelling effect on water improvement resistance Silicon-free Modarez® PW 363 Very good performances in flow and levelling for waterborne coatings. VOC-free, which allows to decrease or remove VOC based coalescing agents in formulations. Good compatibility to various binders. Recommended dosage: 0.5 – 3.0 % delivery form on total formulation. Up to 5% for an open time improvement. SYNTHRON www.synthron.com 6, rue Barbès – CS80050 – 92532 LEVALLOIS-PARIS cedex (France) Phone: + 33 (0) 141341400 Fax + 33 (0) 141341416 e-mail: postmaster@protex-international.com
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