At present, the world's synthetic resin production has reached 200 million tons, and the handling of a large number of post-consumer plastics has become a hot spot in the global environmental protection. There are several ways to handle post-consumer plastics:
1. landfill; 2. incineration; 3. composting; 4. recycling; 5. using degradable plastic.
Recycling methods after plastic recycling mainly include: melt regeneration, thermal cracking, energy recovery, recycling of chemical raw materials and other methods.
New technology for plastic recycling - PolyMag?
Eriez Magnetics of the United States has developed a new plastic recycling technology, PolyMag?, which uses magnetism to improve the classification of plastic waste.
In fact, the technique increases the magnetic susceptibility of the material by adding a special and inexpensive additive (less than 5%), but does not change the physical properties of the material; then, according to the magnetic properties, the material is separated using an Eriezs PolyMag separator. PolyMag® ​​technology can separate two or more components by using different amounts of magnetic additives for each material. For example, the method can separate aBS from polypropylene (PE) or separate thermoplastic elastomer (TPE) from other polymers.
This patent is proposed to solve the problem that the conventional plastic regeneration method cannot sufficiently and efficiently complete the high-purity separation of plastics, and the purpose thereof is to provide a method for high-purity regeneration of plastic products. The patent's independent right is: a method of removing from other materials by increasing the magnetic susceptibility of the plastic article, the method comprising adding a specific amount of magnetic material to the plastic component before the plastic article is formed, wherein the specific amount is Small enough to not affect the properties of the material, but large enough to change the magnetic susceptibility of the article.
The magnetic material mentioned above may be magnetite, ferrosilicon, ferromagnetic particles (such as iron filings), and the specific amount of the magnetic material added is 0.05-5 (wt)% of the plastic component. Using this method, a magnetic separator can be used to separate plastic from waste.
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