At present, the raw materials for the production of biodegradable bags on the market are mainly PLA and PBAT. Generally, one kind of raw material is not used directly to produce biodegradable bags. But today I mainly talk about the source, chemical properties, and industrial cost of polylactic acid (PLA).
Polylactic acid (PLA) is a kind of biodegradable bag material that uses natural plant starch as raw material and is produced by microbial fermentation engineering technology that can be decomposed by microorganisms. This degradable material has unique properties such as complete biodegradability, biocompatibility, water repellency, good permeability, piezoelectricity, and nonlinear optical activity. It has the thermoplastic processability of petrochemical resin. PLA degradable materials can be used in injection molding, extrusion blown film, extrusion casting, extrusion hollow molding, compression molding and other processing methods to manufacture molded products, films, containers; it can also be combined with other materials. PLA biodegradable materials are used in various application fields such as high-grade packaging materials, drug slow-release materials that can be absorbed by the human body, implantable biomaterials, packaging, medical and health, and agricultural films.
Polylactic acid is one of the main sources of organic matter accumulated in microorganisms, and it is also a nutrient for microorganisms. This nutrient can be decomposed into energy by decomposing enzymes in the microorganism when the microorganism enters a hungry state, which is equivalent to animal fat.
At present, the research content of polylactic acid mainly includes two major directions.
- Research on technologies to reduce the industrial chemical cost of polylactic acid and improve processing performance. Such as the use of genetically engineered bacteria, genetically modified plants to produce polylactide. It can be modified with other completely biodegradable materials to improve its performance.
- Research on the synthesis of medium and long-chain polylactic acid strains and processes with special functional groups such as vinyl, cyano, phenyl, F, Cl, etc.
From the above explanation, it can be concluded that at present, as long as the packaging bags made of real degradable materials are definitely environmentally friendly, they will not cause pollution to the natural environment.