Do you really understand degradable materials? You may find new discoveries by reading this article

The introduction of the plastic ban has accelerated the development of degradable materials. According to data released by the European Bioplastics Association in September 2019, as of September 2019, the global bioplastics production capacity was 1.174 million tons, of which PBAT accounted for 28.3%, PLA accounted for 29.3%, starch-based plastics accounted for 44.9%, PBS (poly Butylene butyrate) accounted for 9.1%, and other products accounted for 3%. This article only introduces degradable materials such as PLA, PBAT, and PHA, and hopes to help you choose plastic packaging bag materials. Properties PLAPBATPHA raw material source Polylactic acid petroleum polyhydroxyalkanoate Degradation pathway Degraded into carbon dioxide and water at temperatures higher than 55°C or under the action of oxygen enrichment and microorganisms Under natural conditions, it is degraded by natural microorganisms in water, soil or both In both environments, even under anaerobic conditions, biodegradable products have good mechanical and physical properties, and are suitable for various processing methods such as blow molding and thermoplastic. It not only has good ductility and elongation at break, but also has good heat resistance and impact performance; in addition, it also has excellent biodegradability, high heat resistance, high mechanical strength, low elongation at break, High modulus, low heat distortion temperature, easy to absorb water, brittleness, low heat distortion temperature, low transparency, low strength, low transparency, narrow processing temperature range, poor thermal stability, high brittleness, unstable production quality Multi-field applications such as film drawing and spinning include fully degradable packaging films for automobiles, electronics, disposable daily necessities and other industries; fully degradable packaging bags, including shopping bags, continuous roll garbage bags, pet feces bags, electronic product packaging bags, food packaging Packaging materials such as bags, mulch films, etc., hygiene products and biomedical fields, bioplastics, fibers, biomedical implant materials, daily necessities, packaging materials, etc. Degradation time 6-12 months Lactic acid (PLA) is a new type of biodegradable material made from starch raw materials proposed by renewable plant resources such as corn. It has good biodegradability and can be completely degraded by microorganisms in nature after use, and finally generates carbon dioxide and water, which does not pollute the environment, which is very beneficial to protect the environment and is recognized as an environmentally friendly material. In the field of biodegradability, PLA is known as one of the most promising varieties. Its mechanical properties and physical properties are good, because the raw material is starch and other organisms, so the produced material has no peculiar smell, and even after heating, it will not smell a strong plastic smell. It is suitable for various processing methods such as blow molding and thermoplastic, and the processed products are suitable for many fields such as industry, agriculture, and food. In addition, PLA is a recyclable material. In the natural environment, the waste is degraded to form carbon dioxide and water after 6-12 months. These carbon dioxide and water are then used by plants in photosynthesis to generate starch, and the generated starch can be used again. Made into polylactic acid. Therefore, this material can be said to maintain the natural“carbon cycle balance”, can effectively reduce white pollution and save energy. PBATPBAT is a thermoplastic biodegradable plastic, which is a copolymer of butylene adipate and butylene terephthalate. It has both the characteristics of PBA and PBT, and has good ductility and elongation at break. Good heat resistance and impact performance; in addition, it also has excellent biodegradability, which is very active in the research of biodegradable plastics and one of the best biodegradable materials in the market. The biodegradation of PBAT mainly depends on its chemical structure and degradation environment. It is almost completely biodegradable. In the natural environment, it can be degraded by natural microorganisms, or it can be degraded by chemical hydrolysis or pyrolysis in a specific environment. According to the characteristics of PBAT, it has been widely used in the packaging industry, hygiene products, biomedicine and other fields. PHAPHAs degradable plastics include polyhydroxyalkanoate (PHA), poly3-hydroxybutyrate (PHB), copolymer of 3-hydroxybutyrate and 3-hydroxyvalerate (PHBV) and 3-hydroxybutyrate. Copolymer of ester and 3-hydroxycaproate (PHBH). Degradable plastics such as PHAs are the products of bacteria under unbalanced growth conditions. As a thermoplastic material, PHA can be completely decomposed into carbon dioxide and water in 3-6 months in the natural environment without composting. It has good biocompatibility and is used in medical device surgical gowns, packaging bags and compost bags, medical sutures, repair devices, bandages, orthopedic needles, anti-adhesion films and stents. Although at this stage, PHA technology continues to improve and is gradually developing towards industrialization, it has a narrow processing temperature range, poor thermal stability, high brittleness, unstable production quality, and high production costs. Therefore, at this stage, in terms of replacing plastic products, Still unable to compete with PLA and PBAT, but mostly used in the field of high-end biomedical materials.
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