Poly (lactic acid) (PLA) is a new type of biodegradable material, which is made from starch derived from renewable plant resources (such as corn). Starch is saccharified to obtain glucose, then glucose and certain strains are fermented to produce high-purity lactic acid, and then polylactic acid with certain molecular weight is synthesized by chemical synthesis. It has good biodegradability, can be completely degraded by microorganisms in nature after use, and finally generates carbon dioxide and water, and does not pollute the environment, which is very beneficial to protecting the environment and is recognized as an environment-friendly material. The common treatment method of plastics is still incineration and cremation, which causes a large amount of greenhouse gases to be discharged into the air, while polylactic acid plastics are buried in the soil for degradation, and the produced carbon dioxide directly enters the soil organic matter or is absorbed by plants, and will not be discharged into the air and will not cause greenhouse effect.
Polylactic acid (PLA) has good mechanical and physical properties. Polylactic acid is suitable for various processing methods, such as blow molding and thermoplastic, with convenient processing and wide application. It can be used for processing various plastic products, packaged foods, fast food lunch boxes, non-woven fabrics, industrial and civil fabrics. And then processed into agricultural fabrics, health care fabrics, rags, sanitary products, outdoor ultraviolet protection fabrics, tent fabrics, floor mats and the like, and the market prospect is very promising.
Polylactic acid (PLA) has good compatibility and degradability. Poly (lactic acid) is also widely used in medicine, for example, it can be used to produce disposable infusion sets and tear-free surgical sutures, and low-molecular-weight poly (lactic acid) is used as slow-release packaging agent for drugs.
Polylactic acid (PLA) not only has the basic characteristics of biodegradable plastics, but also has its own unique characteristics. The strength, transparency and resistance to climate change of traditional biodegradable plastics are not as good as those of ordinary plastics.
The basic physical properties of polylactic acid (PLA) are similar to those of petrochemical synthetic plastics, that is, it can be widely used to manufacture various application products. Poly (lactic acid) also has good gloss and transparency, which is equivalent to the film made of polystyrene and cannot be provided by other biodegradable products.
Polylactic acid (PLA) has the best tensile strength and ductility, and it can also be produced by various common processing methods, such as melt extrusion molding, injection molding, blown film molding, foaming molding and vacuum molding. It has similar forming conditions to widely used polymers, and it also has the same printing performance as traditional films. In this way, polylactic acid can be made into various application products according to the needs of different industries.
Poly (lactic acid) (PLA) film has good air permeability, oxygen permeability and oxygen and carbon dioxide permeability, and it also has the characteristic of odor isolation. 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 anti-mildew properties.