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EVONIK FOCUSES ON ADDITIVES FOR PLASTICS AND RUBBER RECYCLING
29 NOVEMBER 2019 BY NICCI CONTENTO

Evonik is engaged in research and development work to come up with solutions for
recycling plastics and rubber. As a specialty chemicals company, the Group can
count on extensive know-how in the area of specialties and additives to support
this effort. While developers are working on solutions for mechanical and
chemical recycling of plastics, the company portfolio already includes a process
additive for efficiently processing rubber waste, such as used tires, to
generate a rugged work material.


Mechanical recycling involves separating and cleaning synthetic materials to
directly reuse them as polymers. The challenge is, however, that this process
affects the quality of the recycled material. Evonik is currently working with a
large disposal company to optimize the recycling of polyethylene, which is
processed in large quantities, especially in packaging films. The Evonik
additive Vestoplast®, an amorphous polyolefin that is primarily used in hot-melt
adhesives, may be the key to making that possible. It can specifically improve
the impact strength or flow properties of polyethylene, which may be helpful for
reusing recycled plastic, for example in injection molding.


Another problem involves unpleasant odors, both in the recycling process and in
products made from recycled substances. The odor-absorbing products of the TEGO
Sorb® brand may offer a solution for neutralizing such smells.


In contrast to mechanical approaches, chemical recycling involves breaking
plastics down into their individual components, meaning that polymers are turned
back into monomers. These monomers can then be converted to polymers of the
desired quality to close the materials cycle. Evonik is currently examining the
feasibility of solvolysis based on alkoxides for PET plastics. The process
breaks these materials down into the two monomers ethylene glycol and dimethyl
terephthalate. PET plastics are used, for example, in beverage bottles. Evonik
is already offering the alkoxides that would enable this chemical recycling as
part of its product range for manufacturing biodiesel.


Evonik's VESTENAMER® process additive is successfully established in the market.
It allows for the efficient processing of rubber waste, for example from used
tires, into a rugged work material.  VESTENAMER®, a polyoctenamer, improves the
flowability of the rubber compound and optimizes the crosslink density between
the rubber particles. This makes rubber waste much easier to process and gives
the recycled materials several desirable mechanical properties. Product
applications include road construction, but also stable mats for farm animals.



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EVONIK will be exhibiting at Compounding World Expo Europe 2020 at stand A205. 

Co-located with:
Plastics Recycling World Expo is organised by AMI, the leading provider of
information, market intelligence, conferences and exhibitions for the global
plastics industry.

AMI provides expert knowledge to help business professionals make informed
decisions to develop products and grow businesses.
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