Since 1978, China has been promoting the technology of plastic film covering so far, and the annual amount of plastic film has reached 1.25 million tons, covering 300 million mu of 40 kinds of crops. However, at present, the recovery rate of waste plastic film is less than 30%, and the plastic film remaining in the soil piling layer has accumulated more and more, resulting in serious “white pollutionâ€. To this end, an enterprise in Shandong Province successfully developed a biofilm biodegradable biofilm, not only solved the problems that have plagued China's agricultural production for many years, but also made China the third country in the world to master this technology.
The oxidative biological double-degrading ecological plastic film comprehensively utilizes oxidative degradation and biodegradation technology, and can be regulated by the addition of different doses of additives according to the growth period requirements of different crops. Ordinary plastic film is a plastic film product made of polyethylene as a base material and blow molding equipment. The reporter saw that the oxidized biological double-degrading ecological film and the common film used the same substrate and blow molding equipment.
“The biggest difference between it and common plastic film is that it adds different proportions of nano-progressive additives in the production process, which can not only retain the good properties of ordinary plastic film stretching, light transmission, but also can be used according to the growth needs of different crops. Control degradation." According to the introduction of enterprise technicians, this technology overcomes the drawback that photocatalytic degradation technology is not easily degraded when there is no light or insufficient light, and is degraded too quickly when there is sufficient light. After being discarded, the ecological plastic film passes the light, heat and microbes of nature and can be used regularly. The controlled degradation of large molecular weight polyethylene to low molecular weight oligomers is then degraded by the common microorganisms in the soil into carbon dioxide, water, and humus, returning to the ecosystem.
Studies have shown that when the crop is filmed for 7-10 years, it will cause serious “white pollution†in farmland, resulting in a 10%-23% reduction in cotton production, a 10%-15% reduction in peanut production, and a 10%-21% reduction in corn production. % - 30%, vegetables reduce 15% - 59%. "A large number of residual membranes will have a serious impact on the destruction of soil structure, crop production, and yield. The use of biodegradable plastic film can cut off pollution sources from the source, and is the most effective way to solve the 'white pollution' of farmland." Yu Qianlin, expert of cotton technology station of Shandong Provincial Department of Agriculture, told reporters. (Reporter Wei Dong)
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