What is a degradable plastic bag?
Is a plastic bag made of degradable plastic:
1. Degradable plastic:
Degradable plastic refers to the addition of a certain amount of additives (such as starch, modified starch or other celluloses, photosensitizers, biodegradants, etc.) during the production process, which reduces its stability and is more easily degraded in the natural environment plastic.
Classification:
Degradable plastics are generally divided into four categories:
1.Photodegradable plastic
Photosensitizers are incorporated into plastics to gradually decompose them under sunlight. It belongs to an earlier generation of degradable plastics. Its disadvantage is that the degradation time is difficult to predict due to sunlight and climate change, so it cannot control the degradation time.
2.Biodegradable plastic
Under the action of microorganisms, plastics that can be completely decomposed into low molecular compounds. 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. 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.Photo/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
Water-absorbing substances are added to plastics, which can be dissolved after discarded in water after use. It is mainly used in medical and sanitary equipment (such as medical gloves), which is convenient for destruction and disinfection.
3. Introduction:
Tests show that most degradable plastics begin to thin, lose weight, decrease in strength and gradually crack into fragments after being exposed to the environment for 3 months. If these fragments are buried in garbage or soil, the degradation effect is not obvious.
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What can be caused by "degradable plastics"
Putting aside the problems of materials itself, China does not yet have a widespread industrial compost industry, and the waste separation and recycling system is not functioning well.
Promoting the use of "degradable plastics" will likely bring new "white pollution". The promotion of "degradable plastics" can easily lead the public to think that this is a material that can disappear on its own without processing, which is misleading.
Returning to the most fundamental issue, the plastic pollution facing China and the world is the price of excessive consumption and irresponsible consumption. Even if "degradable plastics" can be solved by recycling them into industrial compost, the consumption of "degradable plastics" is ultimately the consumption of environmental resources. From this perspective, we need to consider how to reduce the source problem of excessive consumption.
But we cannot deny that in the future, degradable plastics may be a development trend. The director of the Provincial Department of Ecology and Environment stated,
"Now there are no national standards for full biodegradable products, and there are no relevant standards in other provinces. Therefore, Hainan must innovate and become the first local standard for full biodegradability." This still has significance.
Next, I hope that this move by Hainan will force the development and improvement of degradable plastic technology, and remove the constraints of technology, standards, production, and processing processes for the promotion of degradable plastics in the future, so that it can manage "Pollution" has become a truly practical and perfect solution.
At present, there are three kinds of so-called degradable plastics on the market: 1. Polyethylene-based, pseudo-degradable plastics made by adding starch, which become plastic particles after degradation, enters the air and water flow, enters the food chain, and is absorbed by the body. See, the pollution is more serious; 2. It is mainly made of polyethylene, and the pseudo-degradable plastic made of stone is added, and it becomes plastic particles after degradation. Biodegradable materials that completely become carbon dioxide and water after degradation belong to real degradable plastic bags, which can be said to be substitutes for plastics, which can fundamentally solve the problem of plastic pollution, rather than cure the symptoms.
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