The advantages of polylactic acid are mainly as follows:
(1) Polylactic acid (PLA) is a novel biodegradable material made from starch raw materials proposed by renewable plant resources such as corn. The starch raw material is obtained by saccharification to obtain glucose, and then glucose and a certain strain are fermented to produce high-purity lactic acid, and then a certain molecular weight polylactic acid is synthesized by chemical synthesis. It has good biodegradability, can be completely degraded by microorganisms in nature after use, and finally produces carbon dioxide and water, which does not pollute the environment. This is very beneficial to the environment and is recognized as an environmentally friendly material. Caring for the Earth, you and I are responsible. According to the news, the global temperature will rise to 60 °C in 2030. The treatment of ordinary plastics is still incineration and cremation, causing a large amount of greenhouse gases to be discharged into the air, while polylactic acid plastics are buried in the soil for degradation. The carbon dioxide directly enters the soil organic matter or is absorbed by the plant and will not be discharged into the air without causing a greenhouse effect.
(2) Good mechanical properties and physical properties. Polylactic acid is suitable for various processing methods such as blow molding and thermoplastic molding. It is easy to process and widely used. It can be used to process all kinds of plastic products, packaged foods, fast food lunch boxes, non-woven fabrics, industrial and civil fabrics from industrial to civilian. Further processed into agricultural fabrics, health care fabrics, rags, sanitary products, outdoor UV protection fabrics, tent fabrics, floor mats, etc., the market prospects are very promising.
(3) Good compatibility and degradability. Polylactic acid is also widely used in the field of medicine, such as disposable infusion sets, disposable surgical sutures, etc., low molecular weight polylactic acid as a drug sustained release packaging agent.
(4) Polylactic acid (PLA) has its own unique characteristics in addition to the basic characteristics of biodegradable plastics. Traditional biodegradable plastics are not as strong as ordinary plastics in terms of strength, transparency, and resistance to climate change.
(5) The basic physical properties of polylactic acid (PLA) and petrochemical synthetic plastics are similar, that is, it can be widely used in the manufacture of various applications. Polylactic acid also has good gloss and transparency, comparable to films made from polystyrene, and is not available in other biodegradable products.
(6) Polylactic acid (PLA) has the best tensile strength and ductility. Polylactic acid can also be produced in various common processing methods, such as: melt extrusion, injection molding, blown film forming, foam molding and vacuum forming, and The widely used polymer has similar forming conditions, and it also has the same printing properties as conventional films. In this way, polylactic acid can be made into a wide range of applications in response to the needs of different industries.
(7) Polylactic acid (PLA) film has good gas permeability, oxygen permeability and dioxane, and it also has the property of isolating odor. Viruses and molds are easily attached to the surface of biodegradable plastics, so there are concerns about safety and hygiene. However, polylactic acid is the only biodegradable plastic with excellent antibacterial and antifungal properties.
(8) When incineration of polylactic acid (PLA), the calorific value of combustion is the same as that of incinerated paper. It is half of the incineration of traditional plastics (such as polyethylene), and incineration of polylactic acid will never release toxic gases such as nitrides and sulfides. The human body also contains lactic acid in the form of a monomer, which indicates the safety of this decomposable product.