The advantages and application of biodegradable material polylactic acid (PLA)


Advantages of polylactic acid (PLA)

1. Polylactic acid (PLA) is a new type of biodegradable material, which is made from starch raw materials proposed by renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, and then high-purity lactic acid is fermented from glucose and certain strains, and then polylactic acid with a 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 without polluting the environment, which is very beneficial to the protection of the environment and is recognized as an environmentally friendly material. The treatment method of ordinary plastics is still burning and cremation, causing a large amount of greenhouse gases to be discharged into the air, while polylactic acid plastics are buried in the soil and degraded, and the carbon dioxide produced directly enters the soil organic matter or is absorbed by plants, and will not be discharged into the air., Will not cause greenhouse effect.

2. Good mechanical and physical properties. Polylactic acid is suitable for blow molding, thermoplastic and other processing methods, processing is convenient, the application is very wide. It can be used to process all kinds of plastic products, packaged food, fast food lunch boxes, non-woven fabrics, industrial and civil fabrics from industry to civil use. And then processed into agricultural fabrics, health care fabrics, rags, sanitary products, outdoor anti-ultraviolet fabrics, tent cloth, 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 the production of disposable infusion devices, disassembly-free surgical sutures, low molecular polylactic acid for drug sustained-release packaging agents.

In addition to the basic characteristics of biodegradable plastics, polylactic acid (PLA) also has its own unique characteristics. The strength, transparency and resistance to climate change of traditional biodegradable plastics are not as good as ordinary plastics.

The basic physical properties of polylactic acid (PLA) and petrochemical synthetic plastics are similar, that is, it can be widely used to manufacture various application products. Polylactic acid also has good gloss and transparency, and the use of polystyrene made of film, is other biodegradable products can not provide.

6. Polylactic acid (PLA) has the best tensile strength and elongation. Polylactic acid can also be produced in various common processing methods, such as melt extrusion molding, injection molding, blown film molding, foam molding and vacuum molding. It has similar forming conditions to the widely used polymers, and it also has the same printing performance as traditional films. In this way, polylactic acid can be made into a variety of application products according to the needs of different industries.

7. Polylactic acid (PLA) film has good air permeability, oxygen permeability and dioxygen carbon permeability, and it also has the characteristics of isolating odor. Viruses and molds are easy to attach to the surface of biodegradable plastics, so there are doubts about safety and health. However, polylactic acid is the only biodegradable plastic with excellent antibacterial and anti-mold properties.

8, when the incineration of polylactic acid (PLA), its combustion calorific value and incineration of the same paper, is the incineration of traditional plastics (such as polyethylene) half, and incineration of polylactic acid will never release nitride, sulfide and other toxic gases. The human body also contains lactic acid in monomeric form, which indicates the safety of this decomposable product.

Polylactic Acid (PLA) Industry Applications

disposable supplies field

Polylactic acid is absolutely harmless to the human body, which makes polylactic acid has a unique advantage in the field of disposable products such as disposable tableware and food packaging materials. Its ability to fully biodegrade also meets the high environmental requirements of countries around the world, especially the European Union, the United States and Japan. However, the disposable tableware processed by polylactic acid raw materials has defects such as temperature resistance and oil resistance. This causes its function to be greatly reduced, and the tableware is deformed and the material becomes brittle during transportation, resulting in a large number of defective products. However, after technological development, the market has been modified by PLA materials, which can effectively overcome the shortcomings of the original particles, and some even heat-resistant temperatures as high as 120 ℃ or more, can be used as microwave oven materials.

biomedical field

The biomedical industry is the earliest application field of polylactic acid. Polylactic acid has a high degree of safety to the human body and can be absorbed by the tissue, coupled with its excellent physical and mechanical properties, can also be used in the field of biomedicine, such as disposable infusion tools, disassembly-free surgical sutures, drug relief packaging agents, artificial fracture internal fixation materials, tissue repair materials, artificial skin, etc. High molecular weight polylactic acid has very high mechanical properties, in Europe and the United States and other countries have been used to replace stainless steel, as a new type of orthopedic internal fixation materials such as bone nails, bone plates and has been widely used, which can be absorbed by the body metabolic characteristics of the patient free from the pain of secondary surgery. Its technology has high added value and is a polymer material for the development of the medical industry.