The hottest ecological plastic breaks the necessar

  • Detail

Ecological plastics break the necessity of plastic biodegradation

in recent years, degradable plastics, bioplastics and ecological plastics have emerged in order to reduce the degree of plastic pollution. Environmentalists prefer eco-friendly packaging made of starch, beet or corn. However, technically speaking, ecological plastics will be no worse than conventional packaging materials, and its birth has broken the necessity of plastic biodegradation. As for whether the packaging made of ecological plastics has better environmental protection performance as a substitute, it is a difficult question to answer

Germany produces 14million tons of packaging materials every year, almost 40% of which are made of plastic materials. About 1.8 million tons of this kind of plastic packaging has a very short service life, or it is only a disposable plastic packaging, such as plastic film, plastic bags, a) premium products (a); Plastic handbags, plastic gunny bags or disposable tableware and disposable cooking utensils

these packages can also be made of starch plastic and polylactic acid materials without any problem. In this way, in Germany and Europe, iron carbon alloys with carbon content ranging from 0.02% to 2.06% by mass can be replaced by about 6million tons of 'waste packaging' with eco-friendly materials. Due to the strong competition mechanism of plastics in the product market, the price of ecological plastics in the market has not reached the price level of traditional packaging materials and 3ling materials. However, the latest survey of the European Union ecological plastics Commission shows that the positive growth trend of ecological plastics will continue

biodegradability is no longer a necessary prerequisite

in the next few years, the global production capacity of ecological plastic products will increase from 4.2 million tons in 2016 to 6.1 million tons in 2021. Here, interventionists no longer only focus on the degradability of ecological plastics, but also emphasize their longer service life and better technical performance

production capacity of global ecological plastic products in 2016

the most common examples of ecological plastic packaging are integrated handbags and plastic bags packaged with starch based raw materials. In addition to their very flexible packaging methods, starch eco plastics also have alternative solutions to biotechnology; For example, ecological plastic packaging is used in the packaging of cosmetics and lipstick products. In addition, the beverage industry is also an important user of ecological plastic products

25% recycled pellets have been used in the new generation of plastic bottles

the definition of ecological plastic itself is a trouble, because this concept is not protected by legal documents. At the same time, there are also great differences and differences between eco plastic products: for example, some eco plastics are made from proven renewable raw materials, some eco plastics are biodegradable, and some eco plastics are biodegradable because they have the above two characteristics

as for the most common thermoplastic ecological plastics, in addition to the ecological plastics made from starch raw materials, there are pla (polylactic acid) and PHB (Polyhydroxybutyric acid). The main raw material of PLA polylactic acid comes from corn, which is most suitable for the production of packaging films used in a short time or products made by deep drawing process (such as packaging films for drink cups, yogurt cups, fruits, vegetables and meat). PHB Polyhydroxybutyric acid is a polyester produced by fermentation of renewable raw materials, which has characteristics similar to polypropylene plastic produced from petrochemical raw materials

to reduce the weight of parts and products

the chemical composition of ecological pet (the most commonly used ecological plastic material in plastic bottle products) is exactly the same as that of conventional PET plastics; But its raw materials are not the raw materials produced by petrochemical enterprises, but renewable raw materials, such as sugar beet. The biggest advantage of ecological PET plastic is that the adjustment and setting of production equipment are exactly the same. The main production processes of ecological plastic packaging materials are very similar to those of conventional petrochemical raw materials, such as plastic film blow molding machine, plastic extruder, thermoplastic deformation process and deep drawing process, which can continue to be used

after an investigation by the Federal Ministry of environmental protection in Germany in 2012, there was no clear assessment of whether ecological plastics had an effect on ecological balance, but emphasized the complexity of this assessment. Since then, ecological plastic packaging often gets better evaluation results in terms of greenhouse gas emissions and paleontological resource consumption in the evaluation of ecological balance; But from the overall aspect of ecological balance, it has no advantage over plastic packaging produced from paleontological raw materials

today, almost all household products have packaging; Among them, 56%, that is, more than half, are ecological packaging (only 3% about 20 years ago). In the field of PET bottle production, this figure is more optimistic: 98% of PET bottles use ecological raw materials, and they also do a good job in the recycling of raw materials: every plastic bottle today contains 25% recycled pellets. Pet and ecological PET plastic bottles can usually be recycled together without problems

but the recycling and reuse of ecological plastics need to be further. Ecological plastics based on biological raw materials and not biodegradable, such as ecological PE plastics and ecological pet plastics, should be able to be recycled together with 'ordinary' plastic waste; The life of many green plastics ends in waste incineration or biodegradation. Therefore, it is very attractive to reuse these materials. The first technology to realize the recycling of these materials has come out, and the corresponding sorting and recycling equipment has also made some new progress

Copyright © 2011 JIN SHI