PLA biodegradable material
Introduction
Polylactic acid has good thermal stability, processing temperature is 170-230 degrees Celsius, and has good solvent resistance. It can be processed in a variety of ways, such as extrusion, spinning, biaxial stretching, and injection blow molding. Made of polylactic acid In addition to being biodegradable, our products also have good biocompatibility, gloss, transparency, feel and heat resistance.
advantage
1. Polylactic acid (PLA) is a new type ofbiodegradable materials, made from starch raw materials derived from renewable plant resources (such as corn). The starch raw material is saccharified to obtain glucose, which is then fermented with glucose and a certain strain of bacteria to produce high-purity lactic acid, which is then synthesized with a certain molecular weight through chemical synthesis. polylactic acid. It has goodBiodegradability, it can be completely degraded by microorganisms in nature after use, eventually generating carbon dioxide and water, without polluting the environment, which is very beneficial to environmental protection and is recognizedEnvironmentally friendly materials.The treatment method of ordinary plastics is still burning and cremation, which causes a large amount of greenhouse gases to be discharged into the air. However, polylactic acid plastics are buried in the soil and degraded. The carbon dioxide produced directly enters the soil organic matter or is absorbed by plants and will not be discharged into the air. In the air, it will not cause the greenhouse effect.
2. Good mechanical and physical properties. Polylactic acid is suitable for various processing methods such as blow molding and thermoplastic. It is easy to process and has a wide range of applications. It can be used to process various plastic products from industry to civilian use, packaged food, fast food lunch boxes, Non-woven fabrics, industrial and civil fabrics. Then processed into agricultural fabrics, health care fabrics, rags, sanitary products, outdoor anti-UV 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 medical field, such as the production of disposable infusion equipment, disassembly-free surgical sutures, etc., and low-molecular polylactic acid as drug sustained-release packaging.
4. 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.
5. Polylactic acid (PLA) has similar basic physical properties to petrochemical synthetic plastics, which means that it can be widely used to manufacture various application products. Polylactic acid also has good gloss and transparency, and can be usedpolystyreneThe film produced is superior and cannot be provided by other biodegradable products.
6. Polylactic acid (PLA) has the best tensile strength and ductility. Polylactic acid can also be produced by 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 widely used polymers, and it also has the same printing properties as traditional films. In this way, polylactic acid can be made into a variety of application products in response to the needs of different industries.
7. Polylactic acid (PLA) film has good air permeability, oxygen permeability and carbon dioxide permeability. It also has the property of isolating odors. Viruses and molds easily adhere to the surface of biodegradable plastics, so it is safe and Hygienic concerns, however, PLA is the only biodegradable plastic with excellent antibacterial and antifungal properties.
8. When polylactic acid (PLA) is incinerated, its combustion calorific value is the same as that of incinerated paper. It is the best choice for incineration of traditional plastics (such aspolyethylene), and incineration of polylactic acid will never release toxic gases such as nitrogen compounds and sulfides. The human body also contains lactic acid in the form of monomers, which shows the safety of this decomposable product.
Market application
PLA has many applications and can be used in many fields such as extrusion, injection molding, film drawing, and spinning.
extrusion grade resin
Extrusion-grade resin is the main market application of PLA. It is mainly used for fresh fruit and vegetable packaging in large supermarkets. This type of packaging has become an important member of the European market chain. It is also used for some electronic product packaging that promotes safety, energy saving and environmental protection. Above. In these applications, the advantages of PLA such as high transparency, high gloss, and high rigidity are fully reflected, and it has become the leading direction of PLA application. In addition, the application of extrusion-grade resin in horticulture has also begun to gain attention, and it has also begun to gain attention in slope greening. , it has been applied in sandstorm control and other fields.
However, the extrusion processing of PLA is not easy. It is only suitable for processing on some advanced PET extrusion molding machines, and the thickness of the extruded sheet is generally only in the range of 0.2-1.0mm. The processing process affects the moisture content and processing Temperature is particularly sensitive. During extrusion processing, the moisture content is generally required to be less than 50 ppm, which puts forward new requirements for the drying system and temperature control system of the equipment. During the processing, if there is no suitable crystallization equipment, the edge materials will Recycling is also a big problem, which is why there are a lot of PLA scraps circulating in the market.
Injection molding grade resin
In the market application of PLA injection molding, modified resin is more widely used. Although pure PLA has the advantages of high transparency and high gloss, it is hard and brittle, difficult to process and not heat-resistant. Application in injection molding. Of course, the chemical and plastics industries have been working hard to solve these problems.
Overall, the relatively high cost is the biggest reason that hinders the widespread application of PLA in the injection molding market. Although pure resin can reduce some costs through filling modification, this measure has limited effect while ensuring its performance. If it is necessary to improve the performance defects of PLA, such as heat resistance, on the premise of complete biodegradation, the cost will be even higher.
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