Polylatic acid, abbreviated as PLA, is also known as polylactide. It is a thermoplastic polymer obtained by artificial chemical synthesis of lactic acid produced by biological fermentation, which has good biocompatibility and biodegradability.
Molecular formula: (C3H6O3)n
Polylactic acid, also known as polylactide, belongs to the polyester family. Polylactic acid is a polymer obtained by polymerizing lactic acid as a main raw material, and the raw material source is sufficient and can be regenerated. The production process of polylactic acid is non-polluting, and the product can be biodegraded to achieve circulation in nature, so it is an ideal green polymer material.
Polylactic acid (H-[OCHCH3CO]n-OH) has good thermal stability, processing temperature of 170-230 ° C, good solvent resistance, and can be processed in various ways, such as extrusion, spinning, biaxial stretching. , injection blow molding. In addition to biodegradability, products made of polylactic acid have good biocompatibility, gloss, transparency, hand and heat resistance, and can be used as packaging materials, fibers and nonwovens, etc., mainly for clothing (underwear). , outerwear), industry (construction, agriculture, forestry, paper) and health care.
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advantage
(1) Polylactic acid is a new type of biodegradable material. It has good biodegradability. After use, it can be completely degraded by microorganisms in nature, and finally produces carbon dioxide and water without polluting the environment. This is very beneficial to protect the environment. It is recognized as an environmentally friendly material.
(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.
(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) In addition to the basic characteristics of biodegradable plastics, polylactic acid has its own unique characteristics. 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 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, comparable to films made from polystyrene, and is not available in other biodegradable products.
(6) Polylactic acid has the best tensile strength and elongation, and polylactic acid can also be produced in various common processing methods.
(7) The polylactic acid film has good gas permeability, oxygen permeability and dioxane, and it also has the property of isolating odor.
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(8) When polylactic acid is incinerated, its combustion calorific value 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.
The modified polylactic acid PLA can improve the impact resistance, heat resistance, rigidity and flame retardancy of PLA. It has been widely used in the manufacture of computer components, portable notebook cases, mobile phone parts, DVD player housings, optical discs and home appliance parts, auto parts, etc. PLA and other resins, inorganic materials and other materials can be multi-component blended and produced to have A new plastic "alloy" with excellent physical properties. These materials have excellent properties in terms of antistatic, dimensional stability, tear strength, compressive strength, tensile strength and impact strength, and are ideal new types. Environmentally friendly synthetic materials.