Talking about plastic waste from the perspective of environment (below)

At present, various kinds of degradable plastic mulches that have been researched and developed in the country have been subjected to the farmland cover test, and the directly sunlit parts of the ground can be degraded into small harmless small pieces of 16cm2 ​​or less, even powders that are invisible to the naked eye, but shady and buried parts The degradation effect is still relatively poor. To date, no one technology has solved this problem. In addition, the accuracy of the degradation rate in different regions and different species needs to be further studied and solved. Therefore, the country has continued to include degradable plastic film in the “Ninth Five-Year Plan”. Major scientific and technological breakthroughs. The production and promotion of degradable plastics film must comply with the Ministry of Agriculture's trial-demonstration-promotion step-by-step method of gradually expanding the application.

Controllability of degradation rate of degradable plastics

Controllability is an important technical indicator for degradation of plastics, especially degraded plastic film. The current development of photodegradation, photo/biodegradable plastics degradation rate can be basically controlled through appropriate photosensitizer species coordination or appropriate photosensitizer dose adjustment, but due to photodegradation by geographical environment, climate, crop varieties and other constraints Large, so accurate time control needs further study and solution. The rate of degradation of biodegradation rates is currently uncontrollable.

Photodegradation, degradation of photo/biodegradable plastics before use

Photodegradable, photo/biodegradable plastics, as the name implies, are degraded under the action of natural sunlight. They are stored in indoor or warehouses before use, and are protected from light. They are not directly exposed to light, so they are not Degradation occurs before use, affecting performance.

Destructive Biodegradable Plastics with Starch Modification Will Produce Mildew, Worms Before Being Used

Starch is a kind of material that is easy to absorb moisture, moldy, and easily eroded by microorganisms. However, all the starches used at present are modified starches, which solves the problem of compatibility with plastics, and uses moisture-proof and insect-proof packaging. Improved and overcome the shortcomings of easy moisture absorption, mildew and insects.

Degradation Plastics Degradation Residues Impact on the Environment

Degradable plastics are usually high in polyethylene, polypropylene, polystyrene and other polymers. They are mainly olefins obtained from petroleum cracking as the main raw material, olefins are a class of hydrocarbons, and have no adverse impact on the environment. . In addition, it has been proved that the chemical pollution of degradable plastics is based on the heavy metal residues as determined by experiments conducted by the Institute of Soil and Fertilizers, Chinese Academy of Agricultural Sciences, on light degradation, photo/biodegradation, and starch-modified degradable biodegradable polyethylene plastics. , The determination of heavy metal residues will not constitute pollution; (Soil physical pollution mainly refers to the shape of the residual film in the crop cultivation test, when the residual film area is less than 16cm2, the cumulative amount of less than 20 years, the soil water movement, soil capacity, Specific gravity, voids, aggregate structure, and soil aggregates are less likely to be contaminated.

Degradation and recovery

Degradation and recycling are all effective ways to control plastic waste. The use of degradable plastics is effective for those disposable plastic wastes that are heavily polluted, difficult to recycle, and easily scattered in the natural world. However, in order to control landscape pollution, any packaging products should not be littered after use. The same applies to degradable plastic packaging products. They should be recycled or disposed of together with municipal solid waste into the waste disposal system. In recent years, in solid waste treatment methods, along with the research and development of composting technology, the combination of degradable plastics and composting is considered to be a good method for controlling plastic wastes to pollute the environment and return to nature. Therefore, the combination of degrading and recycling organics is an effective way to treat plastic waste. There is no contradiction between them.

The Effect of Degrading Plastic Packaging Materials on Protecting the Environment

At present, our country develops and organizes and plans to gradually put into the market the polyethylene (PE) degradable plastic packaging film (bag), garbage bags, polypropylene (PP) degradable plastic lunch boxes, polystyrene (PS) degradable plastic hair The foam tableware has been tested and applied by relevant departments to prove that under certain environmental conditions, morphological changes, fragmentation, reduced molecular weight, and reduced strength can be achieved after a certain period of time. Some of them are eaten by bacteria. It is speculated that at least half a year or as many as 3-5 years can be fragmented into environmentally harmless fragments by environmental degradation, or, while maintaining a certain shape, it becomes a crumbly tip, and it is not degraded. Compared with plastics, waste reduction and reduction can be achieved, and the purpose of reducing or alleviating environmental pollution can be achieved.

Degradable plastics application prospect

Degradable plastics is a new member of the plastic family. It came into being after the mass production and use of plastics to solve the many environmental impacts of plastic waste. Although there are still many problems to be solved in terms of degradability and economy, it is still one of the better ways to solve the environmental impact of plastic waste. All kinds of degradable plastic products at home and abroad are in the demonstration application and entering the market stage, and its application will gradually expand with the improvement of its own performance and lower prices. At the same time, the policies of various governments, the laws and regulations of environmental protection, and the intensity of implementation will also affect their promotion and application.