The main components of degradable plastic bags

Biodegradable plastics refer to a class of plastics that are degraded by the action of naturally occurring microorganisms such as bacteria, molds (fungi) and algae. The ideal biodegradable plastic is a polymer material with excellent performance, which can be completely decomposed by environmental microorganisms after being discarded, and finally be inorganicized to become an integral part of the carbon cycle in nature.“Paper”is a typical biodegradable material, while“synthetic plastic”It is a typical polymer material. Therefore, biodegradable plastics are both“Paper”and“synthetic plastic”These two material properties of polymer materials. Biodegradable plastics can be divided into completely biodegradable plastics and destructive biodegradable plastics. Destructive biodegradable plastics: Destructive biodegradable plastics currently mainly include starch-modified (or filled) polyethylene PE, polypropylene PP, polyvinyl chloride PVC, polystyrene PS, etc. Completely biodegradable plastics: Completely biodegradable plastics are mainly made from natural polymers (such as starch, cellulose, chitin) or agricultural and sideline products through microbial fermentation or synthesis of biodegradable polymers, such as thermoplastic starch plastics, aliphatic Polyester, polylactic acid, starch/polyvinyl alcohol, etc. belong to this type of plastic. The current situation and development trend of biodegradable plastics at home and abroad are classified from raw materials, and there are at least the following types of biodegradable plastics: 1. Polycaprolactone (PCL), a plastic with good biodegradability, has a melting point of 62°C. Microorganisms that decompose it are widely distributed under festive or anaerobic conditions. As a biodegradable material, it can be mixed with starch, cellulose materials, or polymerized with lactic acid. 2. Polybutylene succinate (PBS) and its copolymers The technology of manufacturing various high molecular weight polyesters based on PBS (melting point is 114°C) has reached the level of industrial production. Japan's Mitsubishi Chemical and Showa Polymer Company have already started industrial production, with a scale of about 1,000 tons. The Institute of Physics and Chemistry of the Chinese Academy of Sciences is also conducting research on the synthesis of polybutylene succinate copolyester. At present, the Institute of Physics and Chemistry of the Chinese Academy of Sciences is preparing to build a PBS production line with an annual output of 10,000 tons, and Guangdong Kingfa Company has built a production line with an annual output of 1,000 tons. 3. Polylactic acid (PLA) The American company Natureworks has done active and effective work in improving the production process of polylactic acid, and has developed the production of polylactic acid by fermenting glucose from corn, with an annual production capacity of 14,000 tons. Japan's UNITIKA company has developed and produced many kinds of products, among which canvas, trays, tableware, etc. are widely used in the Aichi World Expo in Japan. my country's current industrialization includes Zhejiang Haisheng Biodegradable Plastics Co., Ltd. (with a production line of 5,000 thousand tons per year), and the pilot units are Shanghai Tongjieliang Biomaterials Co., Ltd., Jiangsu Jiuding Group, etc. 4. Polyhydroxyalkanoate (PHA) At present, the industrialized production in foreign countries is mainly in the United States and Brazil. At present, the domestic production units include Ningbo Tianan Biomaterials Co., Ltd. (scale of 2,000 tons/year), and the pilot units are Jiangsu Nantian Group Co., Ltd., Tianjin Guoyun Biotechnology Co., Ltd., etc. Using biodegradable plastics obtained from renewable resources, aliphatic polyester and starch are mixed together, and the technology of producing degradable plastics has also been successfully studied. In European and American countries, blends of starch and aliphatic polyesters are widely used to produce products such as garbage bags. The largest and best-selling company in the world is the Italian company Novamont, whose trade name is Mater-bi. The company's products are widely used in Europe and the United States. There are many domestic research and production units, including Wuhan Huali Technology Co., Ltd. (scale 8,000 tons/year), Zhejiang Huafa Ecological Technology Co., Ltd. (8,000 tons/year), Zhejiang Tianhe Ecological Technology Co., Ltd. ( 5,000 tons/year), Fujian Best Biomaterials Co., Ltd. (scale 2,000 tons/year), Zhaoqing Huafang Degradable Plastic Co., Ltd. (scale of 5,000 tons/year), etc. 5. Aliphatic aromatic copolyester The aliphatic aromatic random copolyester (Ecoflex) manufactured by German BASF company, its monomers are: adipic acid, terephthalic acid, 1,4-butanediol. The current production capacity is 140,000 tons/year. At the same time, biodegradable plastic products based on polyester and starch have been developed. 6. Polyvinyl alcohol (PVA) biodegradable plastics For example, in the 1990s, the MaterBi products of NOVMANT in Italy mainly added PVA to starch, which can blow film and process other products. Polyvinyl alcohol materials need to be modified to have good biodegradability. The Institute of Light Industry Plastics Processing and Application of Beijing Technology and Business University has achieved certain results in this regard. 7. Carbon dioxide copolymer In foreign countries, the first countries to study carbon dioxide copolymer are mainly Japan and the United States, but there has been no industrial production. Paper-plastic packaging specializes in the production of various paper-plastic color printing packaging, including stand-up bags, zipper bags, vacuum bags, plastic bags, food packaging bags, aluminized bags, aluminum foil bags, and other products.
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