Development trend of degradable plastics in the ho

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Development trend of degradable plastics in the world market

with the rapid development of plastic industry technology, the current total output of plastics in the world has exceeded 150 million tons, and its use has penetrated into all sectors of the national economy and all fields of people's life. It has been listed as four major technical materials together with steel, wood and cement. However, with the continuous growth of plastic production and use, its waste is also increasing. Some data show that the weight of plastics in municipal solid waste has reached more than 10% and the volume ratio has reached about 30%. Their pollution to the environment and damage to the ecological balance have attracted great social attention. Therefore, efficient plastic recycling technology and the research and development of degradable plastics have become important strategies for the development of the plastic industry and packaging industry, and have become a research and development hotspot attracting worldwide attention

degradable plastic is a new kind of material with degradation function in the plastic family. It has the same or similar application and health performance with similar ordinary plastics before use or in the process of use. After completing its use function, it can be quickly degraded into fragments or debris that are easy to be absorbed by the environment under natural environmental conditions, and further degraded into CO2 and water with the passage of time, and finally return to nature

the research and development of degradable plastics began in the 1970s. At present, the technology of degradable plastics is still in the process of further deepening research, and the process needs to be further improved in order to improve performance, reduce cost, expand use and gradually accelerate the process of marketization

at present, the main countries producing degradable plastics at home and abroad include the United States, Japan, Germany, Italy, Canada, Israel and other countries, and the varieties produced include photodegradable, photodegradable and fully biodegradable plastics. In recent years, various kinds of degradable plastics abroad have made progress to varying degrees. Photodegradation technology is relatively mature, and the research and development of biodegradable plastics is the most active. At present, the annual output of fully biodegradable plastics in the world is about 30000 tons. According to relevant estimates, the output of biodegradable plastics in the United States, Western Europe and Japan will increase from 14000 tons in 1996 to 70000 tons this year, with an average annual growth rate of 35%. Among them, the output and consumption of the United States account for more than 50%, and that of Western Europe accounts for 1/3. At present, BASF, Dow Chemical, DuPont, Eastman and other companies dominate the biodegradable plastic market

generally speaking, biodegradable plastics can degrade into carbon dioxide and water in a short time under certain environmental conditions, but the price is high, about times that of ordinary plastics, so its use is greatly restricted. At present, except for medical and high value-added packaging materials, disposable packaging films (bags), garbage bags, tableware, mulch and other bulk product markets that have a great impact on the environment are difficult to get involved. In order to overcome the problem of high price and promote their products to enter the market as soon as possible, in recent years, Europe, the United States, Japan and other countries have, on the one hand, tapped the potential of the original process, improved the synthetic purity of raw materials and the rate of genuine products, and actively explored new uses, such as water separator villages for civil engineering, aquaculture tools, magnetic cards for industrial and domestic use, and coating and laminating with paper products, and are committed to accelerating the process of practicality. On the other hand, efforts should be made to develop new products filled and blended with natural materials, biodegradable plastics and ordinary plastics. Although the application performance or degradation performance of these degradable plastics are affected to a certain extent, their performance and price are relatively appropriate, easy to market, and also conducive to reducing environmental pollution

as we all know, plastic is light and has good comprehensive properties. According to the foreign research data from the analysis and evaluation of the whole life cycle of products, compared with the current paper-based alternative products, plastics has the advantages of saving energy, saving resources, less exhaust gas and waste water discharged in the production process, light pollution, and significantly reduced waste production. Its only disadvantage is that it is not easy to degrade, but plastic materials have only been developed for about 100 years. Compared with the history of thousands or tens of thousands of years of traditional materials, it is not surprising that there are some disadvantages. We should adopt positive methods to solve the existing problems, that is, we should adopt the method of scientific and technological progress, rather than passive prohibition and elimination. The research and development of degradable plastics is a method of scientific and technological progress, which endows it with the characteristics of easy degradation and retains its original excellent properties. It is a feasible method

at present, the research and development of degradable plastics at home and abroad has made great progress, but there are also many problems in the development, mainly including: there is no unified definition in the world, so there is a lack of correct and unified understanding and accurate evaluation of degradable plastics and its role in environmental protection, which has caused some disputes. So far, a unified test and evaluation method has not been established internationally Identification marks and manufacturers should continue to make good use of the inspection standards for machine products of China Mongolia intergovernmental cooperation, resulting in confusion in its technology market and product market, confusion between fish and eyes, and difficulty in distinguishing true and false; The technology of degradable plastics itself, such as more reasonable process formula, accurate time control, rapid and complete degradation after use, and the recycling technology of waste materials, needs to be further improved and improved. At present, although some degradable plastics products have entered the market at home and abroad, due to the high price, especially the high price of fully biodegradable plastics, it has become the "bottleneck" of promotion and application. To promote the process of practicality, the cost needs to be further reduced and more reasonable

degradable plastics can be applied to the Hostalen process production unit although they exist; There are various problems and controversies in the form of catalyst repair technology, but its development is in the ascendant. In order to accelerate the development of degradable plastics, countries are committed to accelerating the research and establishment of a unified definition, degradation mechanism, evaluation methods and standards of degradable plastics. The 21st century is a century of environmental protection. As a seedling of environmental protection materials, the development prospect of degradable plastics has attracted great attention of relevant social parties. At present, Japan, the United States and Europe are strengthening the research and development of degradable plastics and accelerating the practical process. The Japan biodegradation practical testing Committee predicts that the market size of biodegradable plastics in Japan will be 150000 tons in the next 10 years, and 1.3 million tons in the world. According to the statistics of the American Fredonia group, the demand of degradable plastics in North America in 2000 increased by 8.8% over 1994, of which the United States increased by 8.6%, Canada increased by 12.2%. The latest report of the European feostsullivan company shows that, The market of biodegradable plastic products in Europe is growing rapidly. By 2004, the market sales will increase from US $16.3 million in 1997 to US $73.1 million, an increase of 3.5 times

to sum up, degradable plastics, as high-tech products and environmental protection products, are becoming a research and development hotspot attracting worldwide attention. Its development not only expands the functions of plastics, but also alleviates the environmental contradictions to a certain extent, and shows the power and Prospect of biotechnology and alloying technology in the field of plastic materials from the perspective of synthetic technology. Therefore, the research, development, popularization and application of degradable plastics and non production automation are the hot topics in the future technological development of the footwear industry. From the practical point of view of protecting the earth's environment, or from the inexhaustible renewable resources, or from the academic point of view of synthesizing functional polymers, it is of great significance

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