PLA---Biodegradable material for Plastic Bags

November 30, 2022

PLA---Biodegradable material for Plastic Bags

Nowadays there are different kinds of products on the market under the banner of degradable and fully biodegradable plastic bags. However, can degradable and fully biodegradable plastic bags really be environmentally friendly?Let’s seek the truth.

First of all, let's take a look at the latest fully bable iodegradplastic bag material PLA.



PLA fully degradable plastic bags - what kind of material is PLA?


Polylactic acid (PLA), also known as polylactide, is a polyester polymerized from lactic acid.Polylactic acid belongs to aliphatic hydroxy-acid polymer. It is a hard material in glass state at room temperature. It is converted into carbon dioxide, CH4 and water under the decomposition of microorganisms. It is a typical linear and completely biodegradable material.

Polylactic acid has excellent biodegradability, compatibility and absorbability. It is a non-toxic and non-irritating synthetic polymer material. Its raw material is lactic acid, which mainly comes from the fermentation of starch (such as corn and rice)as well as cellulose, kitchen waste or fish waste.

PLA has a wide range of raw materials, and then the finished products made of it can be directly composted or incinerated after use, and finally can completely reduce CO2 and H2O, meeting the requirements of sustainable development.

At present, PLA is one of the most common materials used in degradable plastic bags. It has a unique feature: "PLA is one of the biodegradable and non-toxic materials because its raw materials come from nature."


Why is PLA widely used as the biodegradable material?


The good transparency, certain toughness, biocompatibility and heat resistance are the main reasons why it can be used in biodegradable packaging bags.


Comparison table of PLA with other traditional materials:



In addition, PLA is perfectly thermoplastic. Compared with traditional petrochemical products, the energy consumption in the production process of polylactic acid is only 20%~50% of petrochemical products, and the carbon dioxide produced is only 50% of petrochemical products.

However, this kind of environmentally friendly material we think is more environmentally friendly than ordinary plastic materials such as PE and PP, and can achieve full degradation. But there are certain conditions.

The decomposition process of this new type of fully biodegradable plastic bag environmental protection material (polylactic acid PLA) is as follows:

Corn starch/plant starch (converted into)→glucose→lactic acid (become through polymerization technology)→polylactic acid PLA biodegradable material

 Fully biodegradable plastic material Polylactic Acid PLA- environmental protection material, can indeed achieve full degradation, but it requires certain conditions:

1. Humidity reaches 90%;

2. The temperature is as high as 60 degrees or more;

3. At the same time, it takes 47 days to have a way to completely decompose.


The use of PLA

Polylactic acid (PLA) is a new type of biodegradable material, suitable for various processing methods such as extrusion, injection molding, film drawing, and spinning. It is easy to process, so it can be used in food packaging, clothing packaging, clothing packaging, fast food Lunch boxes, non-woven fabrics, industrial and civilian fabrics, agricultural fabrics, 3D printing and other fields.


What are the advantages of PLA biodegradable bags?


In terms of performance, biodegradable plastic bags can meet or exceed the performance of traditional plastic bags in some specific areas;

In terms of practicality, biodegradable plastic bags have similar application performance and hygienic performance to similar traditional plastics.

In terms of degradability, biodegradable plastic bags can be degraded quickly in the natural environment (specific microorganisms, temperature, humidity), and become fragments or non-toxic gases that are easily used by the environment, reducing the impact on the environment after being used.

In terms of safety, the substances produced or left in the degradation process of biodegradable plastic bags are harmless to the environment, affecting the survival of humans and other organisms.

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