Classification and characteristics of degradable garbage bags
Time:2022-10-28
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The main raw material of degradable garbage bag is degradable plastic. This is a special kind of macromolecular polymer, which is characterized by that its molecular weight automatically decreases with the end of the product life cycle, and the plastic becomes brittle, soft, easy to crack and loses its mechanical strength. Biodegradable garbage bags are different from ordinary plastic bags. It takes hundreds of years for ordinary plastic bags to be buried in the ground after use, and landfill or incineration treatment will also cause environmental pollution. The appearance of degradable garbage bags has made an important contribution to reducing white pollution and protecting the environment.
Degradable garbage bag refers to the process of plastic bag production by adding a certain amount of starch, modified starch, cellulose, biodegradable agent and other additives to the plastic raw materials, so as to reduce the plastic stability of the degradable garbage bag and make it easier to degrade in the natural environment.
There are mainly two kinds of degradable garbage bags commonly used in the market. One is a degradable material made of PBAT and PLA with starch added. The garbage bags produced by this material can be completely converted into water after decomposition and can be completely decomposed into water and carbon dioxide. In addition to producing degradable garbage bags, it can also be used to produce various shopping bags and disposable plastic films. The disadvantages of this degradable plastic material are low strength and high price. A large amount of leftovers will be produced in production, but these leftovers are difficult to recycle. Therefore, the cost of biodegradable garbage bags made of PBAT and PLA materials is very high, 3-5 times that of ordinary garbage bags.
The other degradable garbage bag is made of bio based plastic. Its raw materials are not only ordinary HDPE, LDPE and other materials and starch, but also many kinds of additives, and the starch content is very high, up to 15%. The biodegradable garbage bag produced by using the bio based plastic can be observed under the microscope. It can be seen that its internal structure is composed of many honeycomb holes. The design of these honeycomb holes greatly increases the area of the product in contact with the air, speeds up the oxidation speed of the garbage bag in the decomposition process. In addition, the bio based plastic raw materials themselves have many additives, which can effectively promote the decomposition speed of the biodegradable garbage bag, The garbage bag is embrittled in a short time and decomposed into innumerable small particles that are harmless to the environment.
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