Do you know about biodegradable plastic bags? Find out
With low cost, easy to use, easy to manufacture, light weight and stable physical and chemical properties, plastics were once considered as one of the "most successful" materials ever created by human beings. Because of these "advantages", the demand and output of plastics in human life are very amazing, and most of them are disposable products with extremely short service life. As a result, a large number of plastic wastes are produced, and how to deal with them has become a global problem.
Some plastic products will be banned. Are you ready? A few days ago, relevant departments of the state issued the "notice on solid promotion of plastic pollution control", which announced the detailed standards for banning and limiting related plastic products. In January 2020, "opinions on Further Strengthening the control of plastic pollution" was printed and issued for implementation. It is suggested that by the end of this year, non-degradable plastic bags, disposable plastic straws and non-degradable disposable plastic tableware will be prohibited in supermarkets and bookstores in municipalities directly under the central government, provincial capitals and cities with separate planning.
With the increasing efforts to ban plastic products in various regions, are the public and plastic products enterprises ready to say "goodbye" to plastics? Can alternative products keep up? How to realize the recycling of plastic resources? Plastic, which people come into contact with almost every day. With the development of e-commerce, express delivery, delivery and other emerging formats, China's consumption of plastic products, especially disposable plastic products, continues to rise. According to the relevant data provided by the recycled plastics branch of China material recycling association, about 63 million tons of waste plastics will be produced in China in 2019, and the overall recovery rate of waste plastics will be 30%, which is in the forefront of the world. The key to do a good job in garbage classification lies in the reduction, recycling and harmless treatment. As a kind of renewable resources, plastics will greatly reduce the waste of resources and energy if it can be recycled. However, due to the great difference in recycling value and sorting cost of different plastics, how to classify and recycle plastics has always been a difficult problem to be solved.
"Traditional plastics have been laid off, and biodegradable plastics can take over.". Biodegradable materials include biodegradable natural polymer materials such as cellulose, starch, paper and so on, and also include biodegradable plastics obtained by biosynthesis or chemical synthesis. It should be noted that each kind of biodegradable materials, including paper, need certain environmental conditions for degradation. If there are no degradation conditions, especially the living conditions of microorganisms, the degradation will be very slow; at the same time, not every kind of biodegradable materials can degrade rapidly under any environmental conditions. Therefore, the treatment of biodegradable materials should be based on its environmental conditions, combined with the structure of the material itself to determine whether it is a biodegradable material.
So, what standards should plastic products meet before they are considered biodegradable? International relevant standards stipulate four tests: first, biodegradation test, the material can be decomposed by microorganism and converted into carbon dioxide; second, disintegration test, the material can disintegrate in the process of composting, without "white pollution"; third, biocompatibility test, compost residue can not have negative impact on biological growth process; Fourth, heavy metal content test, can not contain heavy gold It has an effect on compost residues. Only through these four tests can they be recognized as biodegradable plastics. With the establishment of the National Plastic ban schedule, various localities have launched a number of plastic ban and restriction policies. When traditional plastics are laid off, who will replace them? According to the opinions on Further Strengthening the control of plastic pollution, it is proposed to promote the use of degradable shopping bags and degradable packaging films (bags), promote the use of degradable plastic bags and other alternative products in the field of catering delivery, and strengthen the research and development of degradable alternative materials and products.
Can the degradable plastics on the market take over? In some R & D companies, the answer may be found. These days, in the workshop of a science and Technology Co., Ltd. in Zhuhai, Guangdong Province, workers are busy producing plastic products such as shopping bags, express bags, agricultural films and so on. After 16 years of research and development, the company has an annual production capacity of 60000 tons of biodegradable polyester synthesis and supporting modified special materials, and has mastered a number of core technologies of biodegradable plastics. "Compared with the" white garbage "which can disappear for hundreds of years, under composting conditions, more than 90% of all biodegradable products can be decomposed by microorganisms within 30 days, and enter the nature in the form of carbon dioxide and water; under non composting conditions, some of the completely biodegradable products that have not been treated by the waste treatment plant will be gradually degraded within two years." According to the strategic project director of a science and Technology Co., Ltd. in Zhuhai, Guangdong Province, the biodegradable plastics produced by the company meet the international and national authoritative standards. He said that in the process of using all biodegradable products, we should still do a good job in garbage classification, fixed-point disposal and centralized treatment, and should not be discarded at will.
Price is one of the main factors affecting the popularization and application of degradable plastics. It is understood that the price of a biodegradable plastic bag is generally two to three times that of ordinary plastic bag. On August 21, 2020, the relevant official websites of Guangdong Province issued a notice on the implementation opinions on Further Strengthening the control of plastic pollution (hereinafter referred to as the opinions) At the end of this year, the use of non-degradable plastic bags was prohibited in shopping malls, supermarkets, pharmacies, bookstores and other venues in the urban built-up areas of Guangzhou and Shenzhen, as well as catering package delivery services and various exhibition activities. The use of non degradable plastic bags was regulated and restricted in market markets. By 2022, a number of replicable and promotable plastic reduction and green logistics modes will be formed in the areas with prominent plastic pollution problems and emerging fields such as e-commerce, express delivery and takeout. By 2025, the PRD cities will basically realize zero landfill of plastic waste. All the people in the whole society take action, starting from their own, starting from the small things around us, and using a plastic bag less every day is a support for the environmental protection cause. As long as everyone participates, everyone picks up firewood and the flame is high, the people of the whole country unite as one and unite as a city. Through scientific and technological products to protect our living home and our living environment, we have reason to believe that this plastic garbage is a waste The final victory of the war of annihilation belongs to the people of the whole country