The hottest plastic causes white pollution. Biodeg

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Plastics cause "white pollution" biodegradable plastics solve problems

plastics, as a product of modern science and technology, has now widely penetrated into all areas of life, bringing great convenience to people, but also has a negative impact

plastic has good corrosion resistance, which is both its advantage and fatal defect. Scientific research has found that the degradation rate of plastics is very slow, which usually takes 200-400 years

faced with the environmental pollution problems caused by poly (4 fluoroethylene) (PTFE), perfluoroethylene propylene (FEP) copolymer, poly (perfluoroalkoxy) (PFA) resin, poly (3 fluorochloroethylene) (pctff), ethylene 13 fluoroethylene copolymer (ECTFE), ethylene 14 fluoroethylene (ETFE) copolymer, poly (vinylidene fluoride) (PVDF) and poly (vinyl fluoride) (PVF) plastics, many countries have adopted methods such as burial, incineration and recycling to deal with waste plastics, but, These methods also have insurmountable defects. Landfill treatment covers a lot of land, and it is easy to make the landfill unstable; During incineration, due to the large heat generated by plastic incineration, it is easy to damage the incinerator and discharge dioxin and other harmful substances; Recycling is often difficult to collect and has poor economic benefits

in order to truly solve the problem of "white pollution", some scientists began to explore new ways, and degradable plastics appeared. The research on degradable plastics began in the 1970s. At that time, a British scientist proposed to add cheap biodegradable natural starch to the polymer as a filler. He also registered the first patent for starch filled ethylene plastic, and developed a "biodegradable" plastic obtained by blending starch with polyethylene and rolling it into a film. After being buried in the soil, this kind of plastic will turn into powder after a period of time. According to this, researchers at that time believed that polyethylene had been biodegradable. The emergence of this new material has aroused people's interest in biodegradable plastics, which has triggered a wave of research and development based on starch based plastics. Because the degradable plastic wing of France Football also held its first show in the world's first digital Stadium - adidas future stadium in Saint Denis, the material has the advantages of plastic and does not pollute. Because the upper beam, tie rod and workbench have a considerable weight and dyeing environment, it is regarded as a kind of "functional polymer material" which is widely used in the 21st century. More and more scientists advocate the development and application of degradable plastics, and regard it as an ideal way to solve the "white pollution"

although degradable plastics have been sought after by scientists, studies in the early 1990s found that biodegradable plastics formed by adding natural starch to polymers are not truly degradable. The limit of this material is that it can not be evacuated for the longest time. Remember that polyethylene on the diaphragm is not completely decomposed, but actually it just becomes fragments and remains in the soil. So far, many kinds of biodegradable plastics have been developed at home and abroad, but the types of degradable plastics with good biodegradability and similar properties to traditional plastics are still very limited. From the perspective of environmental protection and renewable resource utilization, the current research on degradable plastics mainly focuses on two aspects: fully biodegradable plastics with complete degradation characteristics and photo/biodegradable plastics with dual degradation characteristics. How to develop degradable plastics with renewable resources as raw materials, which can be completely degraded into environmentally friendly products, and which can be produced in large scale at low cost has always been an important direction of contemporary new material research

scientists believe that the application of degradable plastics can alleviate and suppress environmental contradictions to a certain extent, but due to the impact of various factors such as cost and performance, the scale of degradable plastics in the market is still very small compared with ordinary plastics. Improving the properties of degradable plastics and realizing large-scale production are also the hot spots of research and development in the world

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