Biodegradable plastic R&D and application research (in)
II. Main characteristics of biodegradable plastics Recently, biodegradable plastics developed in the world include natural polymer synthesis, microbial fermentation synthesis and chemical synthesis. There are dozens of varieties in the three major categories. Due to the different raw materials and synthetic methods, apart from having good biodegradability, Table 2 lists examples. The characteristics of the main biodegradable plastic, and compared with ordinary plastic. As can be seen from Table 2, compared with the comprehensive performance of biodegradable plastics, with the exception of PHB and PLA, most of them are similar to LDPE physical properties, and are suitable for the production of soft products, while the rigidity and elasticity of PHB and PLA are high, but they are elongated. The rate is very low; in addition PHB melting point 180 °C and thermal decomposition temperature (200 °C) are similar, resulting in more difficult processing. The glass transition temperature is 60°C. In the use temperature range, so there are some problems that need to be modified to further improve its performance. III. Progress in the application and development of biodegradable plastics In recent years, biodegradable plastics have made great progress in variety development, performance improvement, and production capacity increase, although the cost has also been reduced, but due to the constraints of production efficiency and production scale, the price is still much higher than that of ordinary plastics, even though We are committed to developing an environment that is difficult to recycle after the use of the environment, but the high price (2 to 8 times higher than that of ordinary plastics) remains a barrier for products to be brought to market. Therefore, medical materials and high added value are still used. Packaging materials are the main direction, and at the same time actively explore other uses that are conducive to the protection of the environment and sustainable development. Including the following aspects: a) Current preferred use of biodegradable plastics: Garbage bag, dehydration bag (film, foam plastic) Planting materials, seedlings, lawns (nonwovens, hollow molded products, injection molded products, flat yarns) Civil construction materials (film, net, non-woven, soil (sand) bag Transport cushioning material (starch foam) b) Potential market for biodegradability Fishing wire, fishing nets, industrial fabrics, sacks (filament, staple) Hygiene products, hospital supplies, diapers (adults, infants) (non-woven, multifilament, cotton, film) Cosmetic bottles, pesticide bottles, beverage bottles (hollow molded products) Medical bottles (hollow molded products) Ordinary packaging film, shopping bag, agricultural film (film, shrink film) Food packaging bags, food packaging containers, tableware (films, hollow containers) Pallet, vacuum molded product (sheet, foamed sheet) Buffer packaging materials, fish boxes (films, high foaming materials) Table 2 Characteristics of Biodegradable Plastics Normal align=center> items  Head Normal align=center> Fuse Normal > HDT *1 Normal align=center> Softening point Normal align=center> Glassification temperature Normal align=center> ratio weight Normal align=center> hard degree Normal align=center> Flexural modulus Normal align=center> Expansion Elasticity Normal align=center> Expansion Intensity Normal align=center> Expanded elongation Normal align=center> Notch strike strength 1. All texts, pictures, audio and video presentations of “Source: China Packaging Network†are marked on this website, and the copyright is exclusively owned by “China Packaging Networkâ€. If you need to reprint, please indicate the source. Any media, website, or individual must indicate "source: China Packaging Network" when reprinting. Violators of this site will be held accountable according to law. 2. The manuscript reproduced and noted by other sources is intended to convey more information for readers and does not imply endorsement of its views or the authenticity of its contents. When other media, websites, or individuals re-publish from this site, they must retain the source of the manuscript noted in this site, and must not arbitrarily tamper with the origin of the manuscript and take legal responsibility. 3. If the reprinted version of this website involves copyright issues, please contact China Packaging Network immediately or by email. Contact information Jigsaw Puzzle For Kids ,3D Wooden Puzzle ,Wood Puzzle Yunhe Good Wooden Toys Co., Ltd. , http://www.woodentoysuppliers.com
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