Polylactic acid PLA (Polylactic acid) is a new type of bioplastics. As early as 1932, WaIIace Carothers, a scientist at DuPont in the United States, polymerized lactic acid in a vacuum to produce low-molecular-weight polymers. However, due to high production costs, until In 1987, Cargill, a large American agricultural product company, began to invest in the research and development of a new polylactic acid manufacturing process. At present, NatureWorks, a subsidiary of Cargill, is the world's first polylactic acid industrial production company with a production capacity of approximately 140,000 tons. In China, Shanghai Yifu Packaging Group has established the first domestic production line of polylactic acid with an annual output of 5,000 tons through cooperation with the Chinese Academy of Sciences.
Because polylactic acid material has both biocompatibility and biodegradability, it occupies 42% of the market in all decomposable plastics. In addition to its biodegradable properties, the main advantages of polylactic acid include good mechanical properties and its material source. The main source of polylactic acid is corn and other plant starches. Compared with the physical properties of other conventional plastics, the mechanical properties of polylactic acid are basically similar.
The scientific and technological research project of using polylactic acid PLA biomaterials to produce degradable straws started in 2007. After several years of hard work, Shanghai Yifu Packaging Group Co., Ltd. has achieved a series of relatively large results. It is guaranteed that the product characteristics remain unchanged. Under the premise, a series of straws of various colors and varieties have been developed. The various physical properties of the straw products have been gradually improved. The appearance and use functions of the straws are very close to those of traditional polypropylene materials, with good gloss and transparency, and It has the advantages of safety, hygiene and antibacterial.
In view of the fact that the material source of the polylactic acid straw is the starch of various plants, the source of the matrix material is very wide. In the environment where the price of crude oil is rising and the oil storage capacity is gradually depleting, it not only has a very important environmental protection advantage, but also has a very obvious social Benefits, and is expected to gradually replace the traditional polypropylene drinking straws in the near future.
Since Biodegradable Materials are mainly based on natural macromolecules or polyester species, a polymer made from renewable natural resources, such as microorganisms, plants, and animals, is a kind of polymer produced by its materials. Straw products will not be decomposed in general atmospheric environment and storage warehouses. With sufficient humidity, temperature and appropriate microbial conditions, they can be decomposed into H20 and CO2 by microorganisms after about 45 days in a natural burial or composting environment.
The decomposition of biodegradable straws has two stages: decomposition by hydrolysis reaction and then decomposition by microorganisms. Hydrolysis occurs first in the natural environment, and then microorganisms enter the tissues and decompose it into carbon dioxide and water. Under composting conditions (high temperature and high humidity), the hydrolysis reaction can be completed easily and the decomposition rate is faster. In an environment where the hydrolysis reaction is not prone to occur, the decomposition process is gradual, and the decomposition cycle will be extended accordingly.
Advantages of biodegradable straws
The material is natural, non-toxic, and highly breathable. Some PLA products are approved by the US FDA and can be directly contacted with food. (Even if it contains acidic and alcoholic ingredients, it will not release any hazardous substances to the human body;
●Using any waste treatment method (such as burying, recycling, composting) will not cause any impact on the environment. After being discarded, it can be completely decomposed by microorganisms through the composting environment and burial treatment;
●It can replace traditional plastic straws based on petroleum, and has the same physical properties as traditional plastic straws, and the method of use is the same.