PRIMIS® SAF 9000 can also be used in wall paints to achieve an easy-to-clean effect. Specially formulated easy-to-clean paints prevent foreign matter from penetrating into the surface. PRIMIS® SAF 9000 increases the wet-scrub resistance. That means the wall can be repeatedly cleaned with a wet sponge without damaging the paint. Lab assistant Manuela Mühlthaler demonstrates how effective the new dispersion is in the WACKER test lab. Her colleagues have disfigured a test wall with highlighter, lipstick and pencil. This colorful mess is given a finishing touch with coffee stains, ketchup and mustard. When Manuela Mühlthaler wipes the wall with a microfiber cloth and some detergent, the contamination on the one half of the wall painted with conventional wall paint is only partly removed. The scrawl is smeared and the pigment particles are partly detached from the paint coat; material still adheres in some places. Meanwhile, on the other half, the paint is based on PRIMIS® SAF 9000. Here, the lab technician can wipe away all the stains completely, returning the surface to an immaculate matt white – as though nothing had ever happened.
The remarkable resistance of the new WACKER co-binder is impressively demonstrated by the pencil marks. With a conventional paint coat, the pencil lead leaves a small groove. If the wall paint contains PRIMIS® SAF 9000, on the other hand, the pencil has difficulty penetrating into the wall paint, since the new dispersion is a hard and very resistant polymer.
“I would have liked to have had a wall paint like this when my children were small,” says Dr. Abdulmajid Hashemzadeh, one of the chemists at WACKER who developed PRIMIS® SAF 9000. The composition of the dispersion is chosen so that the film is not easily penetrated by either hydrophilic or oleophilic substances – so, not by coffee and not by lipstick. “This property profile is very attractive to the market,” adds Schierhorn, since water-based dirt is easier to remove from hydrophobic substrates, while grease-based stains are easier to remove from hydrophilic surfaces. Reconciling these two properties posed major challenges for the WACKER chemists. “Years of research were needed to combine all these properties in one product,” says Hashemzadeh.
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