In order to prevent plastic pollution, we advocate the use of biodegradable plastic products, but even if we use biodegradable plastic products, does it mean that we can discard them at will after using them?

At present, the most popular biodegradable materials are PLA and PBAT, which can be fully biodegradable. However, many general standards test the biodegradable performance of biodegradable plastics under certain conditions, such as the national standard GB / T 19277.1-2011, the test conditions are: 58℃± 2℃ temperature, high humidity, 90 days to meet a certain degradation requirements, we can think that the whole biodegradation. Such an environment, artificial composting can do it, but the natural environment is obviously not like this.

We take PLA, for example, according to the polylactic acid base composite material degradation behavior and mechanism study (lu flash), the author through experimental results: " in the soil degradation process, the mechanical strength of composite materials, but the molecular weight of PLA has no significant decrease, composite materials suggests that the composite in short-term natural soil buried condition level of molecular degradation degree is limited."And" PLA degradation and its slowness in the natural soil environment ". In general, if PLA products are buried in a soil, it also takes a long time to degrade.

Not in the soil, but what in the water? According to other studies, the degradation rate of PBAT in seawater is still very slow and difficult to reach a satisfactory level.

So, even biodegradable plastic, discarded will still cause white pollution. Therefore, we should still pay attention to garbage classification after using plastic products, so that the relevant personnel can be centralized treatment, so as to achieve the real green environmental protection, recycling.