① Ordinary degradation
Deterioration → Fragmentation → Fragmentation (→Plastic particles) Conditions: The product itself adds degradable additives, and is abandoned after use and needs to be exposed to a certain amount of light, heat, oxygen, and water in the external environment, such as wind, sand, rain, etc. The consequences of degradation under the action of mechanical force: after a long period of time, debris (or plastic particles) will enter the water cycle, biological cycle and the flow of the entire natural ecology, causing environmental pollution. It is a fact that the impact of entering the human body cycle is still unclear, but Should have considerable cumulative potential harm
Generally, microorganisms are basically unable to participate in the degradation process, and traditional petrochemical plastics belong to this degradation type.
②Partial degradation
The natural material components in the product can be basically completely decomposed under certain conditions after a period of time to produce non-hazardous products (usually water and carbon dioxide), while the remaining materials are still petrochemical plastic materials with ordinary degradation effects and cannot be completely decomposed.
The natural substances contained therein are decomposed after a period of time in a certain environment suitable for microorganisms, and destructive biodegradable plastics (starch-based plastics) (polyethylene PE, polypropylene PP, polyvinyl chloride PVC, polystyrene PS) Such as starch modification or filling to make plastic) belong to this degradation type
③Completely degraded
It can be basically completely decomposed to produce non-hazardous products after a period of time under certain conditions. This form of degradation inevitably requires the participation of microorganisms. Therefore, it is also called biodegradable or biodegradable or biodegradable. Such plastic products are generally also biodegradable. Compost plastic
Including the direct production of renewable natural materials (completely biodegradable plastics, in addition to complete paper products, plant products, and even animal products), the participation of microorganisms in the synthesis of natural materials (completely biodegradable plastics), petroleum and coal These three types are made by chemical synthesis (completely biodegradable plastic)