The output of synthetic resin in the world has reached 200 million tons, and the disposal of large quantities of post-consumer plastics has become a hot spot for the protection of the earth today. At present, there are several ways to treat post-consumer plastics: 1 Landfill: 2 Incineration: 3 Composting; 4 Recycling; 5 Degradable plastics.
Recycling methods for plastic recycling include: melting regeneration, thermal cracking, energy recovery, recycling of chemical raw materials and other methods.
(1) Melt regeneration Melt regeneration is a method of re-thermoplasticizing waste plastics. From the sources of waste plastics, this method can be divided into two categories: the recycling of clean waste plastics recovered from the scraps of resin plants and processing plants; and the recycling of various plastic products mixed after use. The former said that simple regeneration, can produce better performance of plastic products; the latter said that the compound regeneration, generally can only prepare relatively poor performance of plastic products, and the recycling process is more complicated.
(2) Thermal cracking The thermal cracking method is a method in which the selected waste plastics are pyrolyzed to produce burning oil and fuel gas.
(3) Energy recovery Energy recovery is a method of using the heat generated when the waste plastic is burned.
(4) Recycling chemical raw materials, some kinds of plastics, plus polyurethane can be obtained through hydrolysis of raw materials for synthesis. This is a method of using chemical decomposition of waste plastics into chemical raw materials for recycling.
(5) In addition, in addition to the recycling methods for waste plastics mentioned above, there are various methods for using waste plastics, such as the crushing of waste polystyrene foam into the soil to improve the water retention, air permeability and drainage of the soil. Or as a filler mixed with cement made of lightweight concrete, or by adding an adhesive pressed into a mat material.
---China Plastics Industry Net
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