What is “white pollution”? It refers to environmental pollution caused by the discarded agricultural film, plastic film packaging, plastic bags and disposable plastic tableware (sometimes collectively referred as plastic packaging). More accurate definition of white pollution is that it is a image title of the refractory plastic waste (more refers to plastic bags) pollution phenomenon. It refers to the various types of discarded plastic products made by polystyrene, polypropylene, polyvinyl chloride and other polymers. The random litter of the waste and the difficult degradation results in the phenomenon of serious urban environmental pollution.
The predecessor of white pollution is plastic products. Plastic is a kind of synthetic polymer compounds, which is known as polymer or macromolecule and it can change the body style freely. It is a monomer raw material that is obtained by polymerization or condensation polymerization. It consists of additives such as synthetic resins, fillers, plasticizers, stabilizers, lubricants, colorants and so on.
The direct recycling of waste plastic refers to making waste plastics cleaned, crushed, plasticized, direct processed mold without changing modification, or simply processing into useful items with other substances. The resulting plastic products are widely applied in agriculture, fisheries, construction, industrial, daily necessities and other fields.
For example, the recovery of various types of plastic bottles has been very common. PET plastic bottles are widely used in a variety of everages, such as Coca-Cola, Pepsi, Fanta and so on. After plastic bottles recycling, separate these bottles from other types of plastic bottles firstly, and then after crushing, we can make regenerated pellet. The pellet can be re-manufactured PET bottles. Although the recycled pellet can’t be used to contact with food directly, it can be used in the middle layer of three PET bottles and then made into carbonated beverage bottles. It also can be used to manufacture fibers or spinning, pillow core, mattress, sleeping bag, blanket, etc. Moreover, it can also produce glass fiber reinforced materials and blended modified materials (such as the recycled PET mixed with other other polymers to produce a variety of modified materials).
For another example, the PE plastic that is widely used in dairy bottles, food bottles, cosmetic bottles, etc. can be used for cola bottle base after sorting, cleaning and granulating. It is used as a pipe co-extruded intermediate layer or used to fill talcum powder or fiberglass or to make flower cups or injection molded articles. If composite with wood fiber, it also can be used as artificial wood.
According to statistics, recycling 10,000 tons of waste plastic bottles, is equivalent of saving 50,000 tons of oil and reducing carbon dioxide 37,500 tons. Visibly, waste plastic bottle recycling is very suitable for circular economy.