Polylactic acid resin, also known as "corn plastic", is produced by the natural fermentation of natural corn lactic acid, and then obtained through chemical synthesis. Because of its good mechanical properties, processability and biodegradability, and after being discarded, it can be decomposed by microorganisms into carbon dioxide and water under the conditions of composting, so it solves serious white pollution caused by plastics and saves Non-renewable petroleum resources, which are used in the production of packaging, shells, containers, tableware, and medical green products, are playing an increasingly important role. They have been recognized by the world as new ecological materials for environmental protection and sustainable development in the new century, and have become Countries are competing to develop major issues.
The industrial demonstration line with the largest scale and annual output of 5,000 tons of green biodegradable environment-friendly polylactic acid resin has been mass-produced. The production line was completed by the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences and the Zhejiang Hisun Group for more than seven years. Experts believe that the performance of the product line has reached or partially exceeded the level of similar products in the United States, indicating that China has become the second country in the world with a polylactic acid industrialization scale of more than 5,000 tons, and the quality of products has become The world leader. The industrialization of polylactic acid will help China break the green trade barriers of developed countries, promote deep processing of agricultural products, reduce dependence on petroleum, solve white pollution, and form a new type of ecological enterprise to provide strong material support, with significant economic and social significance.
China consumes more than 20 million tons of plastics each year. It is also a big producer of corn. How to use biotechnology to import corn at one end, and plastic at the other end to solve problems such as environmental pollution and shortage of oil, and accelerate the development of high corn resources Value-based and extension of industrial chains, and the cultivation of new types of ecological materials companies have become major issues concerning sustainable development.
Since the late 1990s, researchers from the Changchun Institute of Applied Chemistry at the Chinese Academy of Sciences have focused their research on this direction. In 2000, they cooperated with Zhejiang Haizheng Group to carry out joint research, which accelerated the research and development of polylactic acid and industrialization. After more than seven years of unremitting efforts, researchers have broken through key technologies such as lactic acid dehydration time, polylactic acid molecular weight distribution, cracking catalyst reaction conditions, monomer high-temperature racemization, rectification and polymerization processes, and built a number of key technologies. With the independent intellectual property rights, China's first article and the world's second article with an annual output of 5,000 tons of green degradable environment-friendly polylactic acid resin industrial demonstration line, and achieve mass production. The yield of polylactic acid in this model line is more than 90% of the theoretical yield, and the number average molecular weight of polylactic acid produced is more than 100,000, which fully meets the corporate standard. Packagings, containers and cutlery products made from polylactic acid will inject new meanings into the 2008 Beijing Olympics and provide strong support.
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