China is a big packaging manufacturing country. Plastic packaging accounts for nearly one third of the total packaging output value. Traditional plastics are widely used in all aspects of life because of its excellent performance. Traditional plastics are difficult to degrade after being discarded, which makes the situation of white garbage more serious. If these plastic products are buried, they will seriously pollute the soil and affect the growth of crops; If the gas generated by incineration has certain pollution to the atmosphere and environment; If recycled, it will be affected by weathering and natural wear, which will affect its secondary use performance. Therefore, researchers once again set the research direction on recyclable, environmentally friendly and degradable materials. Thermoplastic starch prepared by blending natural starch and plasticizer has good properties. Among them, the blending of polylactic acid and thermoplastic starch is known as the most promising new packaging material in the 21st century.
Due to the long time in the transportation process and the short shelf life of fruits and vegetables, fresh-keeping film is required to extend the storage period of fruit and vegetable packaging materials. Scientific researchers found that the starch based plastic fresh-keeping film has a good fresh-keeping function. Yang Yue and other I4 coated cassava starch fresh-keeping film liquid on the surface of oranges to form a thin colorless fresh-keeping film, so as to prolong the storage period of oranges. With the continuous research and improvement of degradable plastics, its performance will be continuously enhanced and gradually replace the traditional plastics.
As for disposable tableware, due to the large population and huge food consumption in China, the environmental pollution caused by non degradable materials used for food packaging is very serious. In recent years, "Internet +" is imperceptibly changing people's lifestyle Consumption patterns and behavior habits. Online takeout is favored by office workers and students because of its benefits and convenience. The "lazy economy" and "fast-paced life" have promoted the rapid development of Internet catering takeout. As long as it is easy, people who stay at home can enjoy all kinds of food. However, the amount of garbage generated by each takeout is several times larger. For example, any single takeout may include disposable plastic lunch boxes and plastic covers, The amount of waste such as food bags, plastic spoons and beverage cups is even more amazing. Moreover, plastic is a petroleum based product, and the fluctuation of petroleum price also causes the price of plastic products to be unstable, while the use of degradable materials can largely alleviate the demand for plastic products and environmental pressure.
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