Degradable plastic refers to a type of plastic whose products can meet the requirements of use, and the performance does not change under normal use, and after use, it can be degraded into environmentally friendly substances under natural environmental conditions. The development of degradable plastics abroad began in the 1960s, while China began to study degradable plastics in the 1970s.
Abandoned plastics have caused great damage to the surrounding environment, forming a so-called "white pollution." The harm of white pollution is not only causing visual pollution to life, but also endangering agricultural production, ecological cycle, and other aspects. How to reduce "white pollution" has already become a worldwide problem: Western Europe, the United States, JPN and other developed countries have explicitly banned the use of disposable foam packaging; China has stopped producing ultra-thin nationwide from June 1, 2008, Plastic shopping bags, and cancel the free use of plastic shopping bags. Driven by these policies, biodegradable plastic began to gradually replace the traditional plastic products market.
Plastic pollution characteristics:
1. Wide range of pollution
2. City, farmland, river, ocean and white pollution are everywhere.
3. The rapid growth of pollutants
4. Due to the low price of plastics, easy aging, and short lifespan, as the amount of plastics increases, the wastes increase rapidly.
5. Difficult to deal with
6. Ordinary plastic has the characteristics of acid and alkali resistance, oxidation resistance, corrosion resistance, and degradation resistance. It is not rotten after being buried in the ground for 100 years. It produces a large number of toxic gases such as hydrogen chloride, sulfur oxides, and carbon monoxide during combustion.
7. Difficulties in recycling
8. There are many types of plastic products, which are difficult to sort.
9. The ecological environment is harmful
40. Waste plastics will reduce the quality of cultivated land and affect the growth of crops.
Biodegradable Vegetable Bag
From the application of the first patent for degradable plastics in 1967 to the large-scale production of degradable plastics in the 1990s, the research and development of degradable plastics have experienced more than 50 years of development. From the perspective of technological innovation, the development of biodegradable vegetable bags has gone through three stages.
The first generation of degradable plastics is starch-modified plastics: this type of degradable plastics is modified by adding additives such as starch during the polymerization of traditional monomers so that the plastics can be cracked into tiny plastic fragments in the general environment. However, this method of degradation cannot completely degrade plastic. The remaining plastic fragments are not only difficult to recycle, but also cause the same damage to the ecological environment as ordinary plastics. Many degraded plastics in China are now used as compatibility agents in Nanjing Plastic Thai's grafting material is better.
The second-generation degradable plastics are photothermally degradable plastics: these plastics use photosensitizers and photodegradation regulators added during the production process to degrade the used plastics under light conditions. However, such degradable plastics are greatly affected by environmental conditions during the degradation process.
According to the information released by the Industry Information Network, the research and development of degradable plastics in the past 10 years have mainly focused on biodegradable plastics. The base material of such degradable plastics can be biodegraded, and the degradation efficiency is high under composting conditions and can be completely degraded. However, the production cost of such plastics is still relatively high.
With the continuous advancement of research and the development of degradable plastics, the industrialization process of technology has also continued to accelerate. The mainstream degradable plastics in the world are biodegradable plastics.