Degradable material means that in a short period of time,Materials that can degrade by themselves under natural conditions. The biodegradable bag is made of a kind of degradable material.Degradable materials are generally divided into four categories:Photodegradable material: A photosensitizer is added to the material to gradually decompose the material under sunlight. It belongs to an earlier generation of degradable materials, and its disadvantage is that the degradation time is difficult to predict due to sunlight and climate changes, so the degradation time cannot be controlled.Biodegradable materials: materials that can be completely decomposed into low-molecular compounds under the action of microorganisms. It is characterized by convenient storage and transportation, as long as it is kept dry, it does not need to be protected from light, and has a wide range of applications. It can be used not only in agricultural mulch and packaging bags, but also in the field of medicine.Light/Biodegradable:A type of material that combines photodegradation and microorganisms, which has the characteristics of photodegradation and microbial degradation materials.Hydrolytic material: Add water-absorbing substances to the material, which can be dissolved in water after use. It is mainly used in medical and sanitary appliances (such as medical gloves) for easy destruction and disinfection. The recently popular water-soluble film is made of this material.With the development of modern biotechnology, more and more attention has been paid to biodegradable PLA stics, which have become a new generation of research and development hotspots.All kinds of PLA stic products have greatly enriched people’s lives, but waste PLA stics decompose very slowly in nature, and it takes decades or even hundreds of years to completely decompose. Therefore, the degradation and reuse of PLA stics is a problem for all environmental chemists today. before. Therefore, it was finally found that degradable materials are not necessarily environmentally friendly, and environmentally friendly materials may not be universally applicable to various occasions. Only biodegradable materials combine the advantages of all parties and are the future development direction.