Composite Dispersions
The Best of Both Worlds
WACKER has added an innovative composite dispersion technology to its successful VINNAPAS®product portfolio. The new product combines the special properties of organic and inorganic components – and thus use the positive properties of both systems. The core of the dispersions is made up of inorganic silica particles (the basis of quartz and glass) only a few nanometers in size that are surrounded by organic polymer particles. Inorganic ingredients provide a paint or render with high. mechanical stability, better fire performance and long-lasting color shades. Organic compounds, in contrast, ensure strong adhesion to the substrate and a high degree of cohesion and flexibility. Moreover, organic components make paint or plasters easier to process.
The new composite dispersions consist of an inorganic silica core and a chemically bonded organic polymer. The organic shell prevents the agglomeration of silica particles during storage and the film-forming process and storage, resulting in a homogeneous film and stable dispersions.
The new composite dispersions consist of an inorganic silica core and a chemically bonded organic polymer. The organic shell prevents the agglomeration of silica particles during storage and the film-forming process and storage, resulting in a homogeneous film and stable dispersions.
Homogeneous Film Formation
Conventionally, however, the mineral particles are simply mixed into an organic dispersion. This means that the particles can agglomerate, which results in low storage stability. Furthermore, a phase separation can occur during film formation and subsequently an uneven, heterogeneous film might develop. This inhomogeneity in turn makes the bond less stable and increases the risk of cracks. The organic shell of WACKER’s new composite dispersions is linked chemically to the inorganic core. This prevents silica-particle agglomeration during storage and film-forming, creating stable binders and homogeneous films.
Better Fire Performance
Thanks to the high proportion of inorganic compounds, WACKER’s new binders provide formulations with better fire performance: in extreme heat, paints and plasters remain very dimensionally stable. In tests, it was possible to reduce the combustion period of facade formulations by as much as 50 to 70 percent, depending on the chemical composition of the dispersion part and its percentage in the formulation. This increases the fire protection of buildings, and greatly reduces the need for flame-retardant substances in the coatings. They also confer a long and durable life on plasters and facades, as well as reduce the risk of algae formation and fungal attack.
The Fascination of Chemistry – WACKER’s Audio Magazine
