Acid degradation bags refer to polylactic acid (PLA) packaging bags. The main raw material for the synthesis of polylactic acid is lactic acid, and lactic acid is made from corn, rice, potatoes, beans, etc. through lactic acid fermentation. So what people call cornstarch degradation bags actually includes polylactic acid packaging bags, or PLA degradation bags, or acid degradation bags.
There are two main methods for the synthesis of polylactic acid: direct polycondensation and ring-opening polymerization.
The direct polycondensation reaction has been studied as early as the 1930s and 1940s, but because the key technologies involved in the removal of water produced in the reaction have not been completed, the molecular weight produced is relatively low, easy to decompose, and not practical. As a result, the direct polycondensation reaction of polylactic acid is used in industrial mass production, and the cost is relatively high, and it is not suitable for industrial use.
Ring-opening polymerization is currently the most widely used production method in the world. As early as the 1950s, DuPont researchers used ring-opening polymerization to obtain high molecular weight polylactic acid. In recent years, the research on the synthesis of polylactic acid in many countries has mainly focused on the ring-opening polymerization of lactide. The polylactic acid produced by this method by Cargill of the United States is processed by meltblown and spunbond to develop medical non-woven products. Now polylactic acid is widely used in the field of degradable plastics, slowly getting rid of traditional non-degradable plastic bag products.
The following are examples of the use of polylactic acid (PLA) de-packaging bags in various industrial fields:
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