Biomass materials will be widely used at the 2010 Shanghai World Expo

(January 17, 2007)

Disposable tableware will no longer be used at the 2010 Shanghai World Expo Instead of using traditional plastic, it is made of biomass material "corn plastic", which does not cause any pollution to the environment. On January 16, at the Centenary Celebration Forum of Tongji University, Professor Ren Jie, deputy dean of the School of Materials Science and Engineering, revealed that not only disposable cups, trays, and packaging boxes, but also street signs, badges, and magnetic cards used at the World Expo will also Possibly derived from corn.

Ren Jie explained that this brand-new biomass material is called "polylactic acid", which is a "green oil" prepared from corn and other crops through biological fermentation technology. This material can be recycled, following a circular chain from crops to lactic acid, to polylactic acid, to polylactic acid products, and then to natural degradation, without any burden on the environment. It can be widely used in fields such as agricultural mulch film, fiber textiles, disposable products, packaging materials, engineering plastics, and even modern medical materials. "For example, medical bone nails, steel nails are often used now and need to be removed or replaced. If Using degradable polylactic acid, the bone nail can automatically degrade after a certain period of time, avoiding secondary pain for the patient."

The 2005 Aichi World Expo in Japan has begun to use polylactic acid, a biomass material, to make disposable tableware, trays, and even notebook casings. Ren Jie told reporters that the corn plastic produced in the United States was used at the Aichi Expo. It uses a two-step preparation method with cumbersome process lines, low yield, and high cost, making it unsuitable for large-scale production. "At the 2010 Shanghai World Expo, we will use a one-step polylactic acid preparation process, which is cost-effective, safe and can ensure output."

Ren Jie said that using "corn plastic" as packaging materials has already Being included in the World Expo special plan, used discarded cups or packaging boxes will be landfilled for natural degradation and recycled as absorbable materials. According to reports, global plastic production reached 200 million tons in 2005, and my country's production was about 18 million tons. Not only does the manufacturing process of traditional plastics consume a lot of energy, but some of the finished products are recycled, while the rest are disposed of through methods such as incineration and landfilling, which can cause serious pollution such as land waste and the release of toxic substances.

Ren Jie also revealed that although it is more than enough to use edible corn to make large quantities of biomass packaging materials, experts are still studying the use of other biomass materials including sugar cane, potatoes and sweet sorghum. into plastic products, especially energy materials.

These papers should help you!

Instructor: Qi Qingjie Instructor: Liaoning University of Engineering and Technology Degree awarding unit: Liaoning University of Engineering and Technology

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