WACKER is expanding its new product line of polymeric binders based on renewable raw materials. With its VINNECO® brand, the Munich-based chemical Group will offer a redispersible polymer powder manufactured using biobased acetic acid. The new redispersible polymer powder VINNECO® 5044 N is mainly suitable for producing construction materials, such as waterproofing membranes or dry-mix mortars for external thermal insulation composite systems (ETICS).
These binders provide a high degree of flexibility and adhesion in construction applications such as dry-mix mortars, tile adhesives or waterproofing membranes. (Photo: Wacker Chemie AG)
Ecological and sustainable building construction plays a key role in global efforts to reduce climatically harmful carbon dioxide. As architects and property developers increasingly turn to renewable raw materials, ever more manufacturers of construction materials are now offering such solutions.
“By 2030, 90 percent of our portfolio will consist of products rated as sustainable or at least neutral,” says Frank Reichle, Director of Construction Polymers in Western Europe at WACKER. “With VINNECO® 5044 N, we are taking yet another step in this direction by offering our customers a sustainable alternative to VINNAPAS® 5044 N in the future. Our VINNECO® product line allows producers to replace fossil raw materials with renewables,” Reichle continues.
In the production of the new dispersible polymer powder, WACKER relies on biobased acetic acid. This substance is formed as a byproduct of wood-industry processes such as preparing fibrous material for paper manufacturing. The wood is sourced from forests certified by the PEFC® (Programme for the Endorsement of Forest Certification Schemes) and located within a 400-km radius of WACKER’s Burghausen site. The biobased acetic acid is extremely pure with a low water content and, thanks to its excellent quality, represents a real alternative to fossil sources such as natural gas or petroleum.
WACKER uses biobased acetic acid and ethylene to produce vinyl acetate monomer, which – again using ethylene – is copolymerized to form vinyl acetate-ethylene (VAE). The resulting liquid polymer dispersions are used, e.g., in paint manufacturing. WACKER then uses these dispersions to manufacture dispersible polymer powders in huge spray dryers, where they are atomized and fed into a stream of hot gas, which flash dries them to yield a fine powder. These binders are added to construction applications such as dry-mix mortars, tile adhesives or waterproofing membranes to provide them with a high degree of flexibility and adhesion.
In production, biobased acetic acid can be blended with conventional acetic acid, and is thus directly coupled into WACKER’s existing production line. The quality and properties of the binders are absolutely identical, irrespective of whether the VAE they contain has been made from conventional or biobased acetic acid. The compound always has the same chemical and physical properties. Manufacturers who have already used VINNAPAS® 5044 N for the production of dry-mix mortars can thus retain their processes and do not need to modify their formulations.
VINNECO® 5044 N is rheologically neutral and improves the adhesion, flexural strength, deformability, abrasion resistance and processability of the modified compositions without significantly influencing their flow, thixotropy or water retention. The binder is particularly suitable for formulating low-emission mortars with high flexibility and very good adhesion to organic substrates such as polystyrene, which is used, e.g., in external thermal insulation composite systems (ETICS).
WACKER uses the mass balance method to verify the proportion of biobased acetic acid in the finished product. TÜV SÜD, the technical inspectorate and certification body, has certified this method as meeting its international CMS 71 standard. When customers order a specific quantity of VINNECO® 5044 N, they can be sure that the required amount of biobased acetic acid has been fed into the integrated production system. As verification, the customer receives a TÜV certificate attesting to the use of the renewable raw material. Thanks to the mass balance method, it will be possible in future to produce and certify all the other products of the VINNAPAS® line as sustainable alternatives.
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