With the world-renowned flexible packaging company Amcor and the brand chain Wal-Mart successively planning to introduce environmentally friendly, biodegradable flexible packaging materials, PLA film has become one of the most popular research directions in the chemical research and flexible packaging industry and other institutions and enterprises in recent years. The most common is the Food PLA Flexible Film.
Polylactic acid, abbreviated as PLA, is a starch-based organism such as corn, wheat, and cassava. It is decomposed by enzyme to obtain glucose, and then fermented by soft acid bacteria to become lactic acid. Finally, it is compounded to obtain biodegradable thermoplastic polyester, polylactic acid. It has good biocompatibility, environmental safety, no toxicity, good mechanical properties and light transparency, and good processing performance. It can be used in a variety of packaging materials such as mulch film, food packaging bags, and pharmaceuticals. The waste products of polylactic acid are decomposed by light and biological action and become carbon dioxide and water, which play an important role in eliminating white pollution, protecting the environment and natural ecological balance. So what are the main features of PLA? Multi-purpose Shrink Film Manufacturer will come to tell you.
Food PLA Flexible Film
1. Mechanical properties of polylactic acid
Polylactic acid has better mechanical properties, its tensile strength can reach up to 60MPa, its performance is just brittle, and the flexible molding products required for daily packaging applications become a major problem for polylactic acid, and ordinary high poly Like the material, the mechanical properties of polylactic acid depend on molecular characteristics, such as crystallinity, crystal thickness, spherulite size, molecular chain orientation, and the like. Further, the performance of polylactic acid also depends on the composition, purity, and the like of each isomer contained in the polymer.
2. Degradation performance of polylactic acid
Polylactic acid is a completely biodegradable material, and its final degradation products are carbon dioxide and water. Therefore, it is very friendly to the environment and has no toxic effect on human body. At present, the degradation pathway of polylactic acid is mainly hydrolysis and compost degradation.
Polylactic acid degradation mainly goes through two steps: First, in the absence of biochemical enzymes, esters are randomly broken, resulting in a decrease in molecular weight. This process can be accelerated in both acid and base conditions and is also affected by temperature and humidity. Second, the low molecular weight PLA diffuses outward from the bulk and is engulfed by microorganisms in the environment to convert to CO2, water and humus.
Polylactic acid hydrolysis is roughly divided into two types: catalytic hydrolysis and non-catalytic hydrolysis. Catalytic hydrolysis is further divided into external and internal material catalysis. The hydrolysis mechanism of polylactic acid mainly includes surface erosion and overall erosion. There are many factors affecting the degradation of polylactic acid, and the degradation rate is mainly determined by the reactivity of the polymer with water and catalyst. The shape and size of the material, temperature, humidity, crystallinity, isomer content, residual lactic acid concentration, molecular weight and distribution, water absorption, residual reaction catalyst, etc. can all affect the degradation rate of polylactic acid.
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If you have a need for PLA film, you can contact us. We can provide you with various types of Shrink Films to meet your requirements.
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