Redispersible Polymer Powder for Building Compositions
Redispersible Polymer Powder for Building Compositions
Blog Article
Redispersible Polymer Powder is a free-flowing, white powder produced by spray drying polymer dispersions. Upon addition to mortar, it forms a continuous polymer film that enhances the cohesiveness and flexibility of dry mix materials. This helps in improving water resistance, thixotropy, and anti-sagging, making it ideal for use in applications like tile adhesives, cement-based renders and self-leveling compounds.
Typical examples of state-of-the-art redispersible polymer powders suitable for building compositions are based on natural or synthetic latexes and are obtained by spraying aqueous dispersions under ambient conditions, optionally with the aid of adjuvants, to form what is known as water-redispersible powders. In order to be used successfully, the primary particles of these aqueous latex redispersions must be designed in such a way that they are not only capable of disintegrating to their original primary particle size when added to water but also show good film-forming properties once the aqueous redispersions are dried under ambient conditions.
In the case of natural latexes, these are characterized by their low glass transition temperature (Tg). This is crucial in order to avoid coalescence during spray-drying and subsequent redispersible powder formation. A high Tg, on the other hand, reduces the flexibility of the redispersible powder, a condition that is not desired for building construction materials.
Celanese offers a range of redispersible polymer powders that can be used to significantly improve the critical properties of modern dry-mix mortars, such as adhesion, cohesion and flexibility. Moreover, these products can be used to formulate finished building products with low volatile organic compound (VOC) emissions in compliance with demanding governmental regulations as well as internationally recognized environmental certifications and labels such as LEED, EMICODE EC1PLUS and Blue Angel.
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