Disposable knives and forks and spoons are knives and forks and spoons thrown away after disposable use, including lunch boxes and chopsticks. In the early stage, there was no degradation of foamed plastic products, which caused great pollution to the environment, resulting in "white pollution". Chopsticks in disposable tableware are mostly made of wood, which wastes a lot of wood and leads to large areas of forest being cut down. Disposable spoon used in PVC products is not conducive to health. Later disposable tableware was more widely used, such as starch, which was generally degradable.
Disposable knives, forks and spoons are made of new biological materials, which have been widely used in medical fields, such as artificial joints, dental implants and artificial heart valves. The green leader of biodegradable materials, starch-based biodegradable plastics, is a kind of plastic products made from modified starch. Grafting reaction and mixing with other polymers can replace the general plastic industry. It can be used as packaging materials, shock-proof materials, plastic film, food containers, toys and so on. The properties of starch are related to the relative molecular weight of starch, the length of amylopectin and the ratio of amylose to amylose. Experiments show that starch with high amylose content is more suitable for the preparation of plastics. The product has good mechanical properties. At present, the mechanical properties of starch plastics have basically achieved the standard of traditional plastics. However, due to the moisture absorption of starch itself, the mechanical properties of materials in humid environment will lead to serious water degradation, and the more starch content. Higher, more serious problems, some starch plastics can even be mixed with water.
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