In daily life, the amount of plastic bags is quite large, and there are various types of plastic bags. Usually, we rarely pay attention to the material of plastic bags and the impact on the environment after being discarded. With the promotion of the "plastic ban" step by step, more and more consumers have begun to pay attention to degradable plastic bags. Many customers will switch to degradable plastic bags, but many customers do not know the difference between ordinary plastic bags, degradable plastic bags and biodegradable bags. Let me share with you:

Ordinary plastic bags are made of PE and other plastic materials, and the main component is resin. Resin refers to a polymer compound that has not been mixed with various additives. The resin accounts for about 40-100% of the total weight of the plastic. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. Biodegradable plastic bags have the national environmental protection standard GB/T21661-2008, while traditional plastic bags do not need to comply with this standard. It takes 200 years or more for traditional plastic bags to degrade after they are discarded. Cause "white pollution" to the environment.

Degradable plastic bag: Literally understood as a degradable plastic bag, that is to say, it can be degraded, but there are still plastics and other related ingredients added in it, but it is only partially degraded, not completely degraded. It is mainly made of polyethylene plastic, and it is also called photodegradable plastic bag. This plastic bag is decomposed under the action of sunlight. However, the decomposed polyethylene still exists in the natural environment. Although the white pollution cannot be seen in sight, the white pollution is still invading our surrounding environment in the form of fine particles. To put it simply, after discarding the degradable plastic bag, it is still the same as the traditional plastic bag, and it will also pollute the environment to a certain extent. Its final destination is actually the same as traditional plastic bags. After being discarded, they all enter landfills or are incinerated, and cannot be degraded by special industrial composting. Therefore, "degradable" is just "degradable", not equal to "fully biodegradable". In a sense, degradable plastic bags are not a feasible solution to "white pollution", nor a "panacea" to solve plastic bag pollution. In essence, they still generate a lot of waste, and degradable plastic bags actually have to be less than degradation.

Biodegradable plastic bags: The material composition of biodegradable plastic bags is composed of PLA (polyruic acid) and PBAT (polyadipateic acid). Such materials also include PHAS, PBA, PBS, etc., which are recognized as environmentally friendly materials. harmful to green environmental protection products. Biodegradable plastic bag material, also known as biodegradable plastic, refers to the action of microorganisms existing in nature under natural conditions such as soil or sand, or under specific conditions such as composting conditions or anaerobic digestion conditions or in aqueous culture fluids. Plastics that cause degradation and eventually completely degrade into carbon dioxide (CO2), methane (CH4), water (H2O) and their mineralized inorganic salts of elements contained in them, as well as new biomass.

Biodegradable plastic bags are fully biocompostable bags. Under composting conditions, they can be completely biodegraded within 180 days. The degradation products are carbon dioxide and water, which directly enter the soil and are absorbed by plants, return to the soil, or enter the general environment It can be degraded and will not pollute the environment, so it comes from nature and belongs to nature. Biodegradable plastic bags can be said to be a substitute for plastics, which can greatly reduce the problem of white pollution that cannot be decomposed by traditional ordinary plastic bags. It can fundamentally solve the problem of plastic pollution, rather than treating the symptoms but not the root cause. The use of biodegradable plastic bags greatly reduces the pollution of plastic products to the environment. It is green, environmentally friendly, healthy and hygienic, and safe to use. The degradation ability of biodegradable plastic bags is better than that of other materials, the use is longer than that of paper bags, and the cost is lower than that of paper bags.

The above is the difference between ordinary plastic bags, degradable plastic bags and biodegradable plastic bags, have you learned?