Release time：2023-10-13 Number of views: 43
Degradable plastic bags are a kind of material that is harmless to the environment. In a specific environment or natural environment, it can be completely degraded into carbon dioxide, methane, water, mineralized inorganic salts, etc. As a new type of polymer material, degradable plastic bags have a wide variety, and their technical routes are also constantly developing.
From the perspective of raw materials, degradable plastic bags can come from both petrochemical raw materials and biomass raw materials.
From the degradation mechanism, degradable plastic bags include biodegradation, photodegradation, oxidative degradation and so on.
From the degradation effect, degradable plastic bags can be divided into "complete" degradation and "partial" degradation.
The main function of degradable plastic bags is to reduce the utilization rate of non-degradable plastic products and bring "white pollution" to the environment. At the same time, it can also give the environment a better opportunity for sustainable development, improve the quality of the environment, reduce the pressure on environmental development, and contribute to human development.
The invention has the advantages of good performance, strong practicability, good degradability and high safety. In terms of performance, degradable plastic bags can reach or exceed the performance of traditional plastics in some specific areas; In terms of practicality, the application performance and hygiene performance of degradable plastic bags are similar to that of similar traditional plastics; In terms of degradability, degradable plastic bags can be rapidly degraded in the natural environment (specific microorganisms, temperature and humidity) after use, and it is easy to recycle in terms of safety, and the substances generated or remaining in the degradation process of degradable plastic bags are harmless to the environment and will not affect the survival of humans and other organisms. At present, the biggest obstacle to replacing conventional plastics is that the production cost of biodegradable plastics is higher than that of similar conventional plastics or recycled plastics. Therefore, degradable plastic bags have the advantages of short use time, difficult recycling and separation, low performance requirements, and high impurity content requirements in packaging, agricultural film and other applications.
Recycled plastic bags are plastic materials obtained by physical or chemical methods such as pretreatment, melting granulation and modification. The biggest advantage of recycled plastic bags is that the price is cheaper than new materials and degradable plastic bags, and according to different performance requirements, only one aspect of the performance of the plastic can be processed, and the corresponding product can be produced. In the case of not too many cycles, recycled plastic bags can maintain similar performance to traditional plastic bags, by mixing recycled materials with new materials, you can also maintain stable performance. However, after many cycles, the performance of recycled plastics is greatly reduced or unusable. In addition, it is difficult to maintain good sanitary performance of recycled plastic bags under the premise of ensuring economy. Therefore, recycled plastic bags are suitable for areas with fewer cycles and low sanitary performance requirements.