Chemical self-destructive plastics: Chemical self-destr […]
Chemical self-destructive plastics: Chemical self-destructive plastics have been successfully developed in Switzerland. The chemical self-destructive plastic is sprayed with a special formulation solution on the plastic product to chemically react with the plastic, and gradually dissolve the plastic into a harmless substance that can be washed away by water, no longer polluting the environment.
Optical self-destructive plastic: This plastic contains a chemical that slowly splits as soon as it is exposed. In France, this optical self-destructing plastic is often laid in the fields to keep the soil warm and used to produce early-maturing crops, which can rot after one to three years. But it must be used in a sunny place to ensure it rots at the expected rate. A quarter of beer cans in the United States are made from an optically self-destructing plastic, but in order to avoid premature corrosion, they must be stored in a place that is not exposed to direct sunlight.
More than 20 companies in the United States, Britain, Germany, Japan and other countries have launched bio-destructive plastics. Biologists at the University of Mt. Titzen in the United States have proposed the idea of “planting” decomposable plastics. They use potatoes and corn as raw materials to implant the genetics of plastics so that they can grow bioplastics without harmful components under artificial control. . Imperial Chemical Industries uses bacteria to make sugar and organic acids into biodegradable plastics. The method is similar to the fermentation process for producing ethanol. The only difference is that the bacteria used are Alcaligenes, which can convert the fed material into a plastic called PHBV. This bacteria accumulates this plastic as energy storage, just as humans and animals accumulate fat. When the PHBV accumulated by the bacteria reaches 80% of their body weight, the cells are broken by steam and the plastic is collected. PHBV has properties similar to those of polypropylene, which, when discarded, are stable even in humid environments, but in the presence of microorganisms, it degrades into carbon dioxide and water.
Microbiologists at the University of Göttingen in Germany use a specific genetic isolation of a bacterium to produce polyester inside the plant's cells, which can be used to make plant-based bioplastics. In this type of plastic, it is broken down into water and carbon dioxide under the action of bacteria, so this plastic garbage can return to nature as a plant fertilizer. The scientific and technological personnel of the Japan Industrial Technology Research Institute use agricultural and forestry crop wastes, such as bean straw, to make decomposable agricultural films. Other scientists are experimenting with adding starchy substances to plastics, so that starch-based bacteria are swallowed, causing them to slowly disappear.