Biodegradable materials can be roughly divided into two categories according to their biodegradation process. One is biodegradable materials, such as natural macromolecule cellulose and synthetic polycaprolactone, whose decomposition mainly comes from: (1) physical collapse of plastic structure caused by the rapid growth of microorganisms; (2) hydrolysis under microbial biochemistry, enzyme catalysis or acid-base catalysis; and (3) free radical chain degradation caused by other factors. The other is biodisintegrating materials, such as the mixture of starch and polyethylene, whose decomposition is mainly due to the destruction of the polymer chain by additives, which degrades the molecular weight of the polymer to the extent that microorganisms can digest, and finally decomposes into carbon dioxide (CO2) and water.
Biodisintegrating materials are mostly produced by blending polyethylene and polystyrene with starch and photosensitizer. The results show that  starch-based biodegradable plastic bags will eventually enter the refuse dump without exposure to sunlight. Even if there is biodegradation, biodegradation will take place mainly. The test for a certain period of time shows that there is no obvious degradation phenomenon in the garbage bags, and the garbage bags are not damaged naturally, even play a certain role of "preservation" for the garbage in the bags.
In order to solve environmental pollution, although starch-based plastics are more effective than disposable plastics, polyethylene or polyester materials which can not be biodegraded are still used as raw materials. In addition to starch added, a large amount of polyethylene or polyester will remain and can not be completely biodegraded, but will be decomposed into debris and can not be recovered. The situation is worse when it enters the soil. Complete biodegradable materials have become the research focus of degradation materials because of the confusion caused by waste disposal. Biodegradable materials are widely used and can be completely biodegradable plastic materials and products, including starch-based full biodegradable shopping bags, roll bags, flat bags, high-performance biodegradable fresh-keeping bags, high starch content biodegradable municipal garbage sorting bags, biodegradable express bags, water-soluble washing packaging bags, agricultural film, industrial packaging bags, electronic products. Such products as packaging bags, disposable snack utensils, beverage bottles and cups. These products are derived from natural plants such as maize and cassava, in which the biological content is more than 50%, and can be completely degraded within 90 days at the fastest.
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