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Audi and KIT collaborate to recycle automotive plastics

Company News > Audi and KIT collaborate to recycle automotive plastics

Many parts in automobiles are made of plastics, which must meet strict safety, heat resistance and quality requirements. Therefore, only petroleum-based materials can be made into plastic parts suitable for automobiles, because such plastic parts will be particularly strongly affected. Of wear. In most cases, such materials are not yet recyclable. Although the same type of plastic can usually be recycled mechanically, recycling mixed plastic waste is usually a major challenge.

To this end, Audi and the Karlsruhe Institute for Technology (KIT) University in Germany launched a chemical recycling pilot project as part of the "Industrial Resource Strategy" think tank to integrate this type of hybrid Plastic parts are reinvested into the resource-saving recycling system.

奥迪与KIT合作回收汽车塑料可节约资源、减少汽车生产成本

The chemical recycling method turns automobile plastic into pyrolysis oil (photo source: Audi)

The pilot project is called "Chemical Recycling of Plastics in Automotive Engineering" (Chemical Recycling of Plastics in Automotive Engineering). The goal is to establish an intelligent recycling system for plastics and make this method a supplementary method for mechanical recycling and an alternative to energy recovery. . In cooperation with KIT, Audi intends to initially test the technical feasibility of the chemical recovery method and evaluate the economic and environmental impact of the method.

The evaluation will be carried out by a team led by Professor Dieter Stapf of the KIT Institute of Technical Chemistry (ITC). To this end, Audi needs to provide plastic parts that are no longer used, such as fuel tanks, wheel trims and radiator grilles recovered from the Audi dealer network in Germany. Such plastic parts are processed into pyrolysis oil using chemical recycling methods, and the quality of this oil is equivalent to that of petroleum products, and the materials made from it are as high-grade as new materials. In the middle of the project, parts made from pyrolysis oil can be reused in cars.

Up to now, the chemical recycling method is the only method that can convert this mixed plastic waste into a quality equivalent to the new product. Therefore, more plastic can be recycled. This kind of closed plastic recycling cycle has many advantages. For example, it can save valuable resources because less raw materials are required, which in turn can save energy and costs, and it is also beneficial to the environment. Audi is one of the first automakers to test this recycling method in a pilot project that uses plastics from mass-produced cars.

Audi sees the chemical recovery law as an opportunity to be part of the CO2 workshop program with suppliers. The goal of the Audi CO2 project is to use resources as efficiently as possible, reduce carbon dioxide emissions in the upstream value chain, and focus on materials that require large amounts of use or energy-intensive processes.

One of the successful cases is the aluminum closed loop system (Aluminium Closed Loop). Audi and its suppliers successfully recycled aluminum scrap, and the quality of the recycled scrap reached the quality level of the new product, thereby reducing its environmental balance sheet in 2019 The carbon dioxide emissions of about 150,000 tons were reduced.

Currently, Audi plans to gradually increase the proportion of secondary materials used in its models. For example, Audi uses PET in the A3 model. PET is a plastic polymer that can be separated from other materials, making it easier to recycle. Taking the Audi A3 as an example, the recyclable material content of its three textile seat covers is as high as 89%.

However, the seat covers of Audi cars are not entirely made of recyclable materials. Ute Grönheim, who is responsible for the development of textile materials at Audi, said: “The challenge lies in the lower fabric. The lower fabric needs to be connected to the upper fabric with an adhesive. We are also working hard to replace this material with recycled polyester fiber. The goal is to completely The same materials are used to produce seat covers.” In the future, all Audi models’ textile seat covers will be made of recyclable materials. If the technical feasibility of the chemical recovery method is verified, Audi plans to industrialize the technology and gradually apply it to more components.

previous：BASF's new concept of circular economy next：Dow plans to increase the U.S. PE price by 5 cents/lb in January next year

Audi and KIT collaborate to recycle automotive plastics

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