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Evonik's WPC evolution focuses on acrylic

December 07/2011

(europeanplasticsnews) -- The polymer used in wood plastics composites (WPC) is usually PP or PVC. But Evonik Industries has worked with Reifenhauser to develop a PMMA-based Plexiglas Wood brand.

The new material is compounded and extruded into 50-75% reinforced WPC profiles on a Reifenhauser direct extrusion line.

Carlo Schutz, manager innovative projects at Evonik, says the idea of PMMA-based WPC arose from using acrylic products as protective coatings on conventional wood product surfaces.
Evonik went on to develop colourless and coloured modified PMMA containing binder and adhesion additives. These ensure optimal coupling between the PMMA and cellulose components of the reinforcing wood fibres.


Additional expensive stabilisers are not required, as shown in 10,000 hours of artificial weathering on PPMA- and PP-based WPC profiles, says the company.


Schutz has presented a table showing that natural and coloured Plexiglas Wood has a flexural modulus of 8,800MPa and 10,000MPa. Although below some tropical woods, these values are close to or slightly higher than beech, spruce and red cedar.
Flexural modulus was found to be much higher than for PVC-WPC (6,500MPa) and two different PP-WPC formulations (3,200 and 4,500MPa).

 

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