In fact, for plastic products, we can not unilaterally and simply pursue that plastic products have degradation characteristics. Degradation has scope and limitation, and can not be expanded indefinitely. The vast majority of widely used plastic products do not require degradation, do not need degradation, and even can not be degraded within the service life. The plastic parts in airplanes and automobiles, the plastic parts in refrigerators, televisions, washing machines and air conditioners used in daily life, the widely used building pipes, and the widely used plastic barrels and basins do not want and should prevent degradation in the process of use. Because once degradation occurs, the performance will deteriorate rapidly. Most high-end equipment, precision instruments and large-scale equipment use high-end plastic parts. What they pursue is that they do not decompose or are difficult to degrade in the natural environment or under harsh conditions. Only in this way can they ensure their high performance.
From a scientific point of view, it is not enough to only mention the concept and requirements of "degradable". What are the products after degradation? What will be the impact of degradation products? In particular, the harm of medium molecular weight and low molecular weight products produced in the degradation process of "degradable plastics" to the environment and ecology, especially the impact of 1 ~ 5mm particulate plastics produced by degradation, is a difficult problem of controllable degradation of plastics. The terms "non degradable" and "degradable" are not rigorous and biased. It is impossible to regard the degradability of plastics as a choice of "non-0 or 1". Plastic degradation can be divided into "short-term degradation" and "long-term degradation" in terms of time; According to the degree of difficulty, it is divided into "easy degradation" and "difficult degradation".
In terms of "prohibiting the use of non degradable disposable plastic products", in order to truly legislate and implement it, we need more policy support and overall planning of measures: first, is there enough degradable plastic products produced and put on the market to replace the use demand of existing disposable products? 2、 What is the market price competitiveness of degradable plastic products and original non degradable (refractory) products? 3、 How to configure the recycling and degradation treatment sites and equipment of degradable plastic products? 4、 Is the acquisition and preparation process of degradable plastic raw materials more energy-saving and green?
Based on the reality, if we want to gradually implement the "Prohibition of the use of non degradable secondary plastic products", it is more necessary to vigorously promote the reform of plastic use and life mode, that is, reduce and limit the production and use of "disposable plastic products", and advocate "multiple use" and "long-term use". This advocacy will have a linear or even exponential positive impact on the reduction of plastic product discards, which is a scientific concept and strategy for realizing the sustainable application of greener and more environmentally friendly plastics.
