Evonik’s manufacturing process simplifies the dispersion of AEROSIL silicas

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Evonik’s Coating Additives business line used innovative process technology at its Hanau site to develop four new AEROSIL family fumed silicas that are much easier to disperse: The new AEROSIL product group E 805, AEROSIL® E 812, AEROSIL E 972 and AEROSIL E 9200 is such that formulators can omit the long and expensive grinding step, for example with a ball mill, when incorporating them into paints or coatings.

All the proven properties of the corresponding standard additives AEROSIL R 805, AEROSIL R 812, AEROSIL R 972 and AEROSIL R 9200 are retained.

The four new Easy-to-Disperse (E2D) products from the Specialty Chemistry Group – like their alternatives in the Standard Line – are suitable for rheology control in pigmented and transparent coating formulations. The main applications are wood, plastics, automotive and general industrial coatings. AEROSIL® E 972 is more universally applicable, while other silicas are intended for specific applications – for example, AEROSIL® E 812 and AEROSIL® E 805 are suitable for transparent varnishes from automotive manufacturers, and AEROSIL® E 9200 is mainly used for special stripes. resistance.

The rheological properties of both product groups are the same – with a significantly simplified dispersion of the new AEROSIL E products. To manufacture them, the company is already producing commercial quantities at the Hanau site and has started construction of a new plant. of fumed silica production in Rheinfelden. This will significantly increase the capabilities to meet the high level of market interest.

The process of dispersing rheological additives – such as fumed silica – was once complex and time consuming. Paint manufacturers had to grind the silicas in a long and intensive grinding step using a ball mill to ensure that they were dispersed homogeneously in the formulation and thus could develop their full rheological potential.

From now on, if the formulator uses the new AEROSIL E products, the use of an energy-intensive ball mill is no longer necessary. “We relieved our customers of this extra work,” said Maximilian Morin, head of the industrial and transportation coatings market segment. “This is because the new silicas can be dispersed in a single grinding step using a dissolver.” This turns out to be a definite advantage, especially in the production of transparent coatings.

This easier dispersibility of additives reduces processing times, reduces energy consumption in production, and reduces the amount of labor and materials required for machine maintenance and cleaning. The processes thus become more efficient and sustainable. Another advantage is that the formulator can also add the new E2D products to the finished coating at a later stage. “This allows the formulator to control and adjust the rheology at any time,” explains Maximilian Cornelius, AEROSIL Application Technology Manager. “It’s unique.”

He added that the newly developed manufacturing process should not be limited to these four new AEROSIL® E products. “Therefore, our goal is to use innovative technology to offer customers other additives that are easier to disperse to. the future.”

The technical, regulatory and safety sheets for AEROSIL E 805, AEROSIL E 812, AEROSIL E 972 and AEROSIL E 9200 are available on www.coating-additives.com.


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