What are the raw materials of degradable plastics?

Degradability refers to natural decomposition, which mainly includes: paper, wood, plants, food and other common compounds in nature, such as carbon dioxide and water, under the action of microorganisms. The ubiquitous plastic products facilitate people's lives, but the resulting plastic waste has caused great pollution to the ecological environment. White pollution caused by plastic products led by plastic bags is endangering the natural environment and people's normal life step by step. In order to control white pollution, an important method is to replace ordinary plastics with degradable plastics.

Degradable plastics can be gradually decomposed into pieces by optimizing production raw materials and manufacturing process, and finally completely degraded after several days or months under the joint action of sunlight, rain and microorganisms. At present, the raw materials of degradable plastics mainly include:

Polylactic acid (PLA) is polymerized from lactide monomer extracted from plant sugar, which can be completely degraded into water and carbon dioxide under industrial composting conditions.

Polyhydroxy fatty acid ester (PHA) is a kind of aliphatic polyester with different structures, which is synthesized by microorganisms through various carbon sources. It can be used not only in packaging materials, agricultural films and so on. But also in medicine, cosmetics, animal feed and other fields.

Carbon dioxide * * * polymer (PPC), which looks like polyethylene plastic and has good elasticity, can be completely degraded in soil in a short time and can be directly absorbed and utilized by plants.

Other additives, a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizer, biodegradable agent, etc. ) is added in the production process of plastic packaging products, which reduces the stability of plastics and is easy to degrade in the natural environment.