Munich-based chemical company WACKER is introducing its new VINNEVA product line at this year’s Middle East Coatings Show (MECS) and European Coatings Show (ECS).
These polymer binders enhance the properties of bitumen-based building coatings and ensure that they adhere excellently to concrete, brick and cement. VINNEVA modified bitumen furthermore protects roofs and basements particularly well from the ingress of water. The 2019 Middle East Coatings Show will be held in Dubai from 26 to 28 February. The 2019 European Coatings Show will be held in Nuremberg, Germany, from 19 to 21 March.
Polymers make bitumen emulsions more flexible and more resistant to all kinds of mechanical stress. WACKER has developed binders based on vinyl acetate-ethylene (VAE) copolymers specifically for this application and is presenting them under the VINNEVA trade name at the MECS and ECS 2019.
Tests show that, thanks to the new binders, bitumen coatings adhere excellently to construction material – the tensile adhesion strength increases by up to 60% compared to conventional bitumen emulsions. Tensile adhesion strength is the force required to detach a coating from a substrate, in this case concrete.
Water-pressure tests have revealed another advantage of VINNEVA modified bitumen: when water presses onto a coated concrete slab at high pressure for a full day, VINNEVA modified bitumen forms a more effective barrier than, for example, bitumen emulsions modified with other additives.
VINNEVA polymers are moreover ideal for optimising two-component systems, which are popular in Europe, in particular. These consist of a liquid component – a polymer-modified bitumen emulsion – and a powder-form component made of cement and fillers. These kinds of systems can be applied in particularly thick layers. The use of VINNEVA in the emulsion reduces these coatings’ tendency to form cracks.
The properties of polymer-modified bitumen emulsions largely depend on the origin of the petroleum that is used to make the bitumen. The additives that are used play a role as well. This is why, for its customers, WACKER individually selects its VINNEVA polymers to the bitumen composition and additives. Experts at WACKER’s global technical centres provide support here.
It is thus possible to formulate coatings that are superior to products based on other polymers with regard to key properties such as elasticity, elongation at break and water tightness.
VINNEVA polymers are not only based on petroleum, but also on natural gas. That is why their price fluctuates less in the long term than that of other polymers used for bitumen modification. In addition, they do not contain chlorine.