What are biodegradable plastic bags? What are its advantages and disadvantages?

company-news | Time:2023-07-13

I believe that everyone has discovered in daily life that the traditional plastic bags that were once seen everywhere are gradually disappearing from our field of vision, and replaced by a new type of plastic bag. Many people don't understand, this kind of plastic bag is obviously not as easy to use as before, why do many supermarkets only provide it now? Let us take a look at this new type of plastic bag.

What are biodegradable plastic bags?

This new type of plastic bag is called a degradable plastic bag, also known as an environmentally friendly plastic bag. As the white pollution caused by plastic bags has become more and more serious, the country has promulgated a new ban on plastics, and degradable plastic bags have emerged as the times require, becoming an option to solve the problem of white pollution and a substitute for traditional plastic bags.

What are biodegradable plastic bags?

As the name suggests, biodegradable plastic bags are plastic bags made of biodegradable plastics. What is degradable plastic?Degradable plastics refer to the addition of a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizers, biodegradants, etc.) plastic.Degradable plastics are generally divided into four categories:

photodegradable plastic

Photodegradable plastics refer to plastics that can degrade after being irradiated with light. Once the product is buried in the soil and loses light, the degradation process stops.

biodegradable plastic

Biodegradable plastics are plastics that are degraded by the action of naturally occurring microorganisms such as bacteria, molds (fungi) and algae.

water degradable plastic

Water-degradable plastics add water-absorbing substances to the plastics, which can be dissolved in water after use.

Photo-biodegradable plastics

Photo-biodegradable plastic is an ideal degradable plastic, which is a combined application of the photodegradation mechanism of photodegradable plastics and the biodegradation mechanism of biodegradable plastics.

可降解塑料袋好在哪？

Although plastic itself is degradable, the raw material of traditional plastic bags is polyethylene, which has high corrosion resistance and strong chemical stability. It can only degrade in the natural environment for 200-700 years.Degradable plastic bags are made of PLA, PHAs, PBA, PBS and other polymer materials. In the state of composting, they can be completely degraded within 6 months, and the degradation process will not cause harm to the environment. And the degradable plastic bags can be recycled and reused after being used up.

Disadvantages of biodegradable plastic bags

Because many degradable plastic technologies are relatively backward, focusing on degradability, while ignoring the performance of degradable plastic products, many degradable plastic bags have the problem of soft quality, poor load-bearing and easy to break.Tests have shown that most degradable plastics begin to become thinner, lose weight, and lose strength after being exposed to the general environment for 3 months, and gradually break into pieces. If these fragments are buried in garbage or soil, the degradation effect is not obvious. At present, there is no widespread industrialized composting industry in my country, and the waste classification and recycling system is not working well. Moreover, the promotion of "degradable plastics" will easily lead the public to think that this is a material that "can disappear without treatment" and cause misleading.

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