Four degradable packaging plastic technologies 1

Briefly describe four degradable packaging plastic technologies

degradable plastic technology is to add a certain amount of additives, such as photosensitizers, starch and other raw materials, in the production process of plastic. In this way, degradable plastic products are used up and discarded, but there is still a rough landfill recycling method in some places. After three months of exposure in nature, It can be decomposed into fragments from a complete shape, thus improving the environment at least visually. But the biggest drawback of this technology is that these fragments can not continue to degrade, just from large pieces to small pieces of plastic, which is not fundamentally competent for the task of eliminating white pollution

hot pressing technology of adding amine to plant fiber powder

this technology is based on the crushing of plant fibers, such as straw, straw, bagasse, etc., to obtain fiber powder, which is then mixed with a large amount of glue or resin, and then injected into the mold to form under high pressure and high temperature. If the long glass fiber reinforced composite cannot successfully provide the stiffness or strength required for bearing, the products produced by this technology are better in terms of the arithmetic mean value of the degradation test of 10 samples, but the disposable tableware produced by this technology does not remove the fiber pigment in the production (because the chemical bleaching method must be adopted to remove the pigment, which is bound to cause water pollution), the appearance color of the products is not satisfactory. In addition, in the production process, the pesticide residues on the surface of plant fibers are difficult to remove, so it is not very safe to make food containers. Moreover, due to the limitations of technology, it is difficult to achieve industrialized production

paper instead of plastic technology

paper instead of plastic technology uses pulp as raw material to form and dry in molds to produce disposable tableware. The tableware made by this method is titled as "environmental protection product" because of its non-toxic, harmless, easy to recycle, renewable and degradable advantages. It is an alternative technology with good comprehensive evaluation at present. However, if the whole process of paper production is evaluated, this technology also has shortcomings. First, the production of pulp requires a large number of forest resources, while China's forest resources are limited, and a large number of deforestation causes soil erosion, which is not in line with China's national conditions; On the other hand, pulp will cause serious water pollution during production, and in some cases, the degree of pollution is even higher than that of plastic. Therefore, from a macro perspective, the technology of replacing plastic with paper can not completely eliminate the environmental pollution, but advance the environmental pollution of tableware to that of making lunch boxes. Moreover, the high production cost of pulp makes the price of paper tableware produced with pulp relatively high, so replacing plastic with paper is not a perfect solution

fully biodegradable technology

this technology mainly uses starch as the main raw material, adds one-year growth period plant fiber powder and special additives, and makes a fully biodegradable fast-food box after chemical and physical treatment. As starch is a biodegradable natural polymer, it will be decomposed into glucose under the action of microorganisms, and finally into water and carbon dioxide, without any pollution to the environment. In addition, the material blended with it is also a fully degradable material, so the fast food box made of this material has excellent degradability. It was found by the relevant national departments that the samples began to mold in the composting state after 5 days, and the tested samples were integrated with the compost after 10 days. The samples lost their shape and color before the test, and all turned into water and carbon dioxide after 40 days