Historical Evolution And Development Of Degradable Plastic Film

Degradable mulching film can be divided into additive biodegradable mulching film and complete biodegradable mulching film.

Additive biodegradable mulching film refers to the addition of biodegradable promoters and processing AIDS on the basis of universal plastics without biodegradable characteristics.The mechanism is that on the basis of traditional mulching film, photosensitizer, starch and other components are added to promote the degradation of mulching film, including: common photodegradable mulching film on the market, photodegradable/biodegradable mulching film and so on.Due to the large amount of plastic components in the base film, the plastic film can be degraded into small fragments and particles after use, but smaller plastic fragments and particles can not be degraded.In the short term, there will be no obvious negative impact on crop growth, but with the extension of use time, the plastic debris and particles in the soil gradually increase, difficult to remove, may bring more serious pollution than the use of plastic mulch, is not conducive to the sustainable development of agriculture.These are the stage products in the development process, the main substrate is still using non-degradable polyethylene, polypropylene, polyvinyl alcohol and other materials.It has been gradually withdrawn from the market.

The real degradation era is coming, with the emergence of PLA, PBAT, PBS and other materials that can achieve pure biodegradation, degradable mulching film really entered the degradation era.The pure biodegradable mulching film can achieve full biodegradation through composting and fermentation, no residue, no impact on land and crops, and through the formulation or process adjustment, it can realize the advantages of controllable degradation time, safe use and complete degradation.Completely biodegradable mulch is a film composed of substances that can be completely decomposed by microorganisms, including: total plant degradable mulch, microbial synthetic biodegradable mulch and chemical synthetic biodegradable mulch.