Since the implementation of the plastic restrictions in 2008, the annual growth of plastic products has decreased from 20% to less than 3%. However, pollution is still very serious, and the increase in plastic has greatly offset the actual achievements of plastic restrictions. Previously, plastic restrictions were mostly used to reduce the use of plastic products through price leverage and cultural promotion, but they were unable to prevent the widespread use of heavily polluting plastic bags. This time, a "ban order" has been issued, with a comprehensive upgrade and a ban on direct use. PLA fully degradable plastic bags have become a choice to solve the problem of white pollution and a substitute for traditional plastic bags. How much do you know about PLA fully decomposed plastic bags? Today, the editor will lead you to learn about PLA fully degradable plastic bags.
What is the material and composition of PLA fully degradable plastic bags?
PLA is a polymer composed of small lactic acid units (polylactic acid). Heritage is an organic acid that plays an important role in our daily lives. The yogurt we usually drink or anything with glucose can be lactic acid. The lactic acid in PLA consumables comes from corn and is made from starch raw materials extracted from corn.
At present, PLA is one of the most common biodegradable plastic bag materials, with the unique feature of "PLA is one of the non-toxic biodegradable substances, and its raw materials come from nature".
PLA fully degradable plastic bags - What determines the rate of PLA decomposition?
The biodegradation process and its duration largely depend on the environment. For example, heat, humidity, and microorganisms are the three necessary factors for PLA to affect the decomposition rate of plastic bags. PLA decays fastest in high-temperature environments with abundant microorganisms. If plastic bags that completely decompose PLA are buried deep in the soil, there will be signs of corruption within 6 months.
PLA fully degradable plastic bags require longer time to decompose at room temperature and pressure. In ordinary rooms, the complete decomposition of PLA plastic bags will last for a long time. Sunlight does not accelerate biodegradation (excluding heat), and like most plastics, ultraviolet rays only lose the color of the material and become pale.
PLA is one of the most common biodegradable plastics, which is a polymer collected from lactic acid as the main raw material. The production process of PLA is pollution-free, and the product can be biodegradable. After use, PLA can be decomposed into carbon dioxide and water by composting at a temperature above 55 or by reducing the interaction between oxygen and microorganisms, achieving material circulation in nature without affecting the environment. At present, the production of polylactic acid mainly adopts the ring opening polymerization process of lactide, which dehydrates the lactic acid to form oligomers, then decomposes the lactide, and then generates polylactic acid through ring opening polymerization. PLA also has reliable biosafety, biodegradability, good mechanical properties, and processability, and is widely used in fields such as packaging, textile industry, agricultural film, and biological polymers. The disadvantage of PLA is that the decomposition conditions are relatively harsh. However, the cost of PLA in biodegradable plastic bag materials is relatively low, so PLA consumption ranks among the top.