What is a degradable plastic bag?
1. Degradable plastics:
Degradable plastic refers to the addition of a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizer, biodegradation agent, etc.) in the production process, which reduces its stability and is more easily degraded in the natural environment. plastic.
2. Classification:
Degradable plastics are generally divided into four categories:
1. Photodegradable plastic
Incorporate photosensitizer in plastics to gradually decompose plastics under sunlight. It belongs to an earlier generation of degradable plastics, and its disadvantage is that the degradation time is difficult to predict due to sunshine and climate change, so the degradation time cannot be controlled.
2. Biodegradable plastic
Under the action of microorganisms, it can be completely decomposed into low molecular compound plastic. It is characterized by convenient storage and transportation, as long as it is kept dry and does not need to be protected from light, and has a wide range of applications. It can be used not only for agricultural mulch, packaging bags, but also in the medical field. With the development of modern biotechnology, biodegradable plastics have received more and more attention, and have become a new generation of research and development hotspots.
3. Light/biodegradable plastic
A type of plastic that combines photodegradation and microorganisms. It has the characteristics of both photodegradation and microbial degradation of plastics.
4. Water-degradable plastic
Add water-absorbent substances to plastics and dissolve them in water after use. It is mainly used in medical and sanitary appliances (such as medical gloves) for easy destruction and disinfection.
3. Introduction:
Tests have shown that most degradable plastics begin to thin, lose weight, lose strength after being exposed to the general environment for 3 months, and gradually crack into pieces. If these fragments are buried in garbage or soil, the degradation effect is not obvious.
Extended data
What problems does "degradable plastics" bring?
Regardless of the material itself, there is currently no widespread industrialized composting industry in China, and the waste separation and recycling system is not functioning well.
Promoting the use of "degradable plastics" will likely bring new "white pollution". And the promotion of "degradable plastics" will easily make the public think that this is a material that "can disappear without treatment" and cause misleading.
Returning to the most fundamental issue, the plastic pollution currently facing China and the world is the price of excessive consumption and irresponsible consumption. Even if "degradable plastics" can be recycled into industrial compost to solve the degradation problem, the consumption of "degradable plastics" is ultimately the consumption of environmental resources. From this perspective, what we need to consider is how to reduce the source problem of excessive consumption.
But we cannot deny that in the future, degradable plastics may be a development trend. Deng Xiaogang, director of the Hainan Provincial Department of Ecology and Environment, said,
"Now there is no national standard for fully biodegradable products, and there are no relevant standards in other provinces, so Hainan wants to innovate and be the first truly biodegradable local standard." This still has its significance.
Next, I hope that this initiative of Hainan will force the development and improvement of degradable plastic technology and break the constraints of technology, standards, production, processing procedures, etc. for the promotion of degradable plastics in the future, so that it can control the "white" "Pollution" has become a truly practical and perfect solution.
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