The principle of biodegradable polyethylene, is polyethylene degradable

The principle of biodegradable polyethylene is to first know what its properties are.

2. Polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), phenolic (PF), urea-formaldehyde (UF), epoxy (EP), polyester (PR), polyurethane (PU), polymethyl methacrylate (PUMA), silicone (Si) and other synthetic polymer compounds have very stable molecular structures and are difficult to be naturally degraded.

In the production process of plastic packaging products, a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizers, biodegradants, etc.) are added to reduce the stability of plastic packaging and make it easier to degrade in the natural environment. At present, there are 19 units in Beijing that develop or produce degradable plastics. Tests have shown that most degradable plastics begin to thin out, lose weight, lose strength, and gradually crack into fragments after 3 months of exposure to the general environment.

If these debris are buried in garbage or soil, the degradation effect is not obvious. The use of degradable plastics has four disadvantages: first, it consumes more food; Second, the use of degradable plastic products still cannot completely eliminate "visual pollution"; Third, due to technical reasons, the use of degradable plastic products cannot completely solve the "potential harm" to the environment; Fourth, degradable plastics are difficult to use due to the presence of special additives.

**Utilization. Polyethylene (PE) is the bag that we usually use to load things in the supermarket, and now our country and many countries in the world do not advocate the use of it, mainly because it is difficult to use. It's hard to degrade!!

Is polyethylene biodegradable? Many people may not know much about polyethylene, which is a product of ethylene high pressure, and many people are curious about whether this product can be degraded. I have collected and sorted out the relevant information about is polyethylene degradable for you, let's find out together.

Polyethylene can be degraded.

However, at high temperatures, there is enough energy to break the C-C bond before degradation occurs, but the degradation product is generally a mixture of propylene, butene, and ethylene, and the degradation temperature is generally about 450 °: those containing ester groups are much easier to degrade than PE, especially under the conditions of hot water, acid, alkali and ethanol, for example, the degradation of PET acid and alkaline water can generally be degraded at 100-150 degrees, and under the condition of ethanol, the conditions may require a higher point, and the temperature is about 180-250, It is also necessary to apply proper pressure; In short, the degradation of each polymer has certain differences, and it is still necessary to work hard to study it.

Can polyethylene garbage bags be degraded?

It can be degraded, but it takes a long time to degrade.

Polyethylene has excellent chemical stability, and is resistant to various chemical substances such as hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, potassium hydroxide, etc., at room temperature, but nitric acid and sulfuric acid have a strong destructive effect on polyethylene;

Polyethylene is easy to photooxidation, thermal oxidation, ozone decomposition, and easy degradation under the action of ultraviolet rays, and carbon black has excellent light shielding effect on polyethylene. After irradiation, cross-linking, chain breaking, and the formation of unsaturated groups can occur.

Milky white, translucent thermoplastic made from ethylene homopolymerization and copolymerization with a small amount of olefin. Density, according to density, there are low-density polyethylene (including linear low-density polyethylene), ultra-low-density polyethylene, etc. Odorless and non-toxic.

Resistant to chemicals and insoluble in solvents at room temperature. Low temperature resistance, minimum use temperature -70 -100. Good electrical insulation, low water absorption.

Polyethylene is a common plastic material, if not properly disposed of, it will cause great pollution to the environment. Although it takes a long time for polyethylene to degrade, under certain conditions, it will gradually decompose and generate some substances, mainly including the following: pants.

1.Tiny particles (microplastics): During the decomposition of polyethylene plastics, small fragments and particles are formed that can be confused with marine life, causing environmental problems.

2.Water and carbon dioxide: During the photocatalysis, oxidation or microbial decomposition of polyethylene, gaseous substances such as water and carbon dioxide are released.

3.Formic acid, acids and ketones: When polyethylene is degraded, it also releases some organic acids, such as formic acid, acetic acid, etc., as well as ketone compounds, such as hexanone, octanone, etc. These compounds can cause certain pollution and risks to the environment.

In short, the degradation of polyethylene will produce microplastics, water and carbon dioxide, organic acids and ketones and other substances, among which microplastics are an environmental problem that has attracted a lot of attention in recent years. Therefore, we need to do a good job in the processing and sorting of polyethylene as much as possible to reduce pollution and waste to the environment. <>

Polyvinyl alcohol can be nutriently degraded by the by-bend matter, and can also be oxidized naturally by the wind and sun.

At present, fully degradable polymers include PLA, PBAT, PBS, PBSA, PCL, PPC, PGA and other biodegradable plastics. So it seems, degradable plastic.

There are many categories. From the perspective of raw materials, degradable plastics can come from both petrochemical raw materials and biomass materials. From the perspective of degradation mechanism, degradable plastics include biodegradation, photodegradation, oxidative degradation, etc.

From the perspective of degradation effect, it can be divided into "full" degradation and "partial" degradation.

It is worth noting that biodegradable plastics are "full" degraded. However, additive degradable plastics such as photodegradation and oxidative degradation belong to "partial" degradation, and they cannot be completely degraded into carbon dioxide.

CO2) or methane.

ch4) and so on.

Biodegradable plastics are mainly used as food soft and hard packaging materials due to their good degradability, which is also their largest application field at this stage.

The main target markets for biodegradable plastics are plastic packaging films, agricultural films, single-use plastic bags, and single-use plastic cutlery. Compared with traditional plastic packaging materials, the cost of new degradable materials is slightly higher. However, with the enhancement of environmental awareness, people are willing to use slightly higher new degradable materials to protect the environment, and the enhancement of environmental awareness has brought huge development opportunities to the biodegradable new material industry.

With the development of China's economy, the successful holding of the Olympic Games, the World Expo and many other shocking activities that shocked the world, the need for the protection of various world cultural heritage and national scenic spots, the environmental pollution caused by plastics has been paid more and more attention, and the first level at all levels has listed the control of white pollution as one of the key tasks.

Europe, the United States, Japan and other developed countries and regions have formulated and introduced relevant laws and regulations, through local bans, restrictions, compulsory collection and pollution taxes and other measures to limit the use of non-degradable plastics, and vigorously develop biodegradable new materials to protect the environment and protect the soil, of which France in 2005 introduced a policy that all disposable plastic bags must be biodegradable after 2010.

At the same time, China has also introduced a number of policies to encourage the application and promotion of biodegradable plastics. In 2004, the National People's Congress passed the Renewable Energy Law (Draft) and the Solid Waste Law (Amendment) to encourage the utilization of renewable biomass energy and the promotion and application of degradable plastics. In 2005, the national document No. 40 clearly encouraged the use and promotion of biodegradable plastics; In 2006, the state launched a special project on promoting the development of biomass biodegradable materials; On January 1, 2007, the "Definition, Classification, Labeling and Degradable Performance Requirements for Degradable Plastics" was implemented by Europe, the United States and Japan and other countries, which provided convenience for Chinese enterprises to export their products.