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Evaluation of the performance of starch-based plastic degradation bags

by:XCBIO     2021-09-06
1. Full starch degradation plastic plastic bags, National Quality Supervision and Inspection Center for Plastic Bag Products (Beijing), Weng Yunyi and others, tested corn starch materials, corn starch materials, and corn under controlled composting conditions in accordance with GB/T 19277 (IDT ISO 14855). The final biodegradation rate of starch film is above 70%. 2. Starch-filled biodegradable plastic plastic bags, National Quality Supervision and Inspection Center for Plastic Bag Products (Beijing) Weng Yunxuan and others, based on the mold erosion test of GB/T 17295 (MOD ISO 846), tested the potential degradation performance of films with different starch content Experiment, the results of the experiment are shown in Figure 2-3. It can be seen from Figure 2-3 that after 28 days, the quality loss of the PE film containing 50% potato starch and 50% corn starch has exceeded 30%, and the PE film containing 50% potato starch is basically broken down into small pieces. The average value of the film containing 15%-25% corn starch reached 11.4% after 28 days, but the PE film without starch basically did not grow mold after 28 days, so it can be concluded that the addition of starch It is definitely conducive to the growth of mold. When the filling amount of starch exceeds 50%, the mold erosion effect of the product is definitely good, but when the starch content is 15% to 30%, the increase in the amount of starch does not have a great impact on the degradation quality loss. It may be that the microbial attack points of plastic plastic bags in the degradation experiment did not increase greatly with the rapid increase of starch content, so that the quality loss did not increase greatly with the rapid increase of starch content. The above experiments show that although the plastic products made of starch-filled traditional plastics cannot be biodegraded, they have partial degradation properties and are easily eroded by molds. Therefore, when developing products, attention should be paid to the required degradation performance requirements and the requirements for mildew resistance.
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