Polylactic acid (PLA) is a biodegradable material made from raw starch extracted from renewable plant resources such as corn. Its degradation principle mainly involves the enzymatic action of microorganisms on PLA, which breaks it down into lactic acid and other small molecules through hydrolysis reactions, ultimately leading to degradation in the natural environment.

First, let's take a deeper look at the structure and properties of PLA. PLA is a linear polymer formed from lactic acid molecules through a polymerization reaction. This material has good biocompatibility and processability, and is therefore widely used in packaging, medical and agricultural applications. Compared with traditional petroleum-based plastics, PLA has better environmental performance because it can be broken down by microorganisms into harmless substances in the natural environment.

So, what is the degradation principle of PLA degradable plastic bags?The degradation process of PLA is mainly divided into two stages: firstly, the hydrolysis stage, and then the microbial degradation stage.

The hydrolysis stage refers to the decomposition reaction of PLA under the action of water, generating lactic acid and other small molecules. This process usually takes place under certain temperature and humidity conditions and usually takes several months. During this process, the molecular chain of PLA is gradually destroyed and the molecular weight gradually decreases, which eventually leads to the loss of the original physical properties of the PLA material.

Next is the microbial degradation stage. When the PLA material is hydrolyzed, the lactic acid and other small molecules generated become a food source for microorganisms. Microorganisms grow and multiply by ingesting these substances. In the presence of microorganisms, the rate of PLA degradation is greatly accelerated. These microorganisms can be bacteria, fungi, etc., which secrete specific enzymes that enzymatically degrade PLA and further break it down into harmless substances such as carbon dioxide and water.

During the degradation process, the rate of PLA degradation is affected by a variety of factors, such as temperature, humidity, microbial species and number, and the crystallinity of PLA. In order to accelerate the degradation process of PLA, some measures can be taken, such as improving the crystallinity of PLA, adding degradation promoters, etc.

The degradation principle of PLA degraded plastic bags provides us with an environmentally friendly and sustainable alternative to plastics. With the increasing awareness of environmental protection, biodegradable materials such as PLA will play an increasingly important role in the future. At the same time, we should also pay attention to how to further improve the performance of biodegradable materials and reduce their production costs, in order to promote their application in a wider range of fields.

In addition, the promotion and application of PLA degradable plastic bags require the joint efforts of the government, enterprises and consumers. The government can introduce relevant policies to encourage and support the research and development and production of biodegradable materials; enterprises can increase investment in research and development, improve product quality and performance, reduce production costs; consumers should also improve environmental awareness, choose to use products made of environmentally friendly materials, and work together to protect the environment to make a contribution.

In conclusion, the degradation principle of PLA-degradable plastic bags provides us with an environmentally friendly and sustainable plastic alternative. Through in-depth understanding of its degradation process and influencing factors, we can better promote and apply this material to make positive contributions to protecting the environment and realizing sustainable development. Zhongke Juntai New Material Technology has developed different functional degradable films and environmentally friendly raw materials, bamboo powder, corn starch and other degradable materials.