Recycling of the hottest composite materials is no

It is difficult to recycle composite materials (Continued)

it is difficult to recycle and reuse

environmental problems have become a concern of enterprises, society, industries, and even everyone. Composite recycling technology is not the only problem. Taking paper plastic composite packaging as an example, the separation and recycling technology of paper plastic aluminum composite packaging has been mature, but the current situation of recycling is not optimistic. We can see this from the current situation of several domestic composite packaging recycling enterprises

for a long time, people have always been used to throwing Tetra Pak bricks, refrigeration materials, Tetra Pak pillows and other packages into waste bins after drinking fruit juice drinks and dairy products. According to statistics, Tetra Pak packaging weighs more than 20 tons every day in Shanghai alone. In a year, there are 200 million Tetra Pak as milk cartons alone. In the past, due to recycling technology, most of these discarded Tetra Pak bags were mixed with "non recyclable" waste and sent to waste incineration plants to be burned. Tetra Pak packaging box contains a large number of non degradable materials, which not only increases the difficulty of incineration, but also pollutes the environment. However, the number of waste sterile packaging in China is up to 110000 tons a year. However, the recyclable materials such as Yang et al. Get multilayer poly (2 allyl 2 methyl ammonium chloride) - modified graphene and 2 manganese oxide composites through self-assembly method, which have high capacitance and high cycle times of hundreds of tons

Shanghai Caile environmental protection products Co., Ltd. began to carry out technological research and development as early as 1998. It recycles Tetra Pak and other waste composite paper packages discarded at random in daily life, and then makes Caile boards through a series of high-tech processes such as cleaning, crushing, heating, pressing, etc., and then further produces garbage cans, outdoor floors, desks and chairs, industrial trays, student desks and chairs, podiums and other products. Shenzhen Green Shield Environmental Protection Technology Co., Ltd. began to establish the R & D and promotion system of Caile board products in 2002, and has also launched peel boxes made of Caile board in Guangzhou, Shenzhen, Shanghai, Beijing and other cities. Hangzhou Fuyang Fulun paper factory also launched the "hydraulic re pulping and plastic granulation project of composite paper packaging" in April 2004. The main reason for producing pulp and plastic particles with waste composite paper packaging is buffer failure. Xu Kaoshen, an individual investor, is also launching a similar project in Beijing. At present, he has negotiated with more than 300 waste collection stations in Beijing and has received strong support from the Balizhuang sub district office of Chaoyang District, Beijing. He will carry out the recycling of composite paper packaging in seven subordinate communities

the centralized recycling of milk cartons is an important step in recycling

at present, the biggest difficulty encountered by these projects on November 2, 2015 is the waste supply problem. Because the packaging box has not been included in the recycling system of the environmental sanitation department, the recycling supply chain is not perfect. This environmental protection technology project with "double high economic and social benefits" suffers from the lack of "rice" in the pot, which is difficult to realize its potential. At present, the recovery rate of milk cartons in Shanghai is less than 5%. Of the 700million milk cartons produced in Shencheng every year, more than 600million are mixed in domestic waste and burned or landfilled for nothing. 98% of the raw materials of Caile company come from the scrap of Tetra Pak and other companies; Secondly, it is linked with some schools to recycle the packaging of "student milk"; Go to the recycling bin to buy. In addition, they also opened a Tetra Pak recycling, but only threeorfour bags are received every day. The monthly production capacity of Fulun paper factory is 300 tons, but at present, only about 10 tons can be recycled every month, and the remaining processing capacity can only be used to treat conventional waste paper. It seems that the recycling of "misplaced resources" still needs the support of more citizens

in Brazil, which is also a developing country, a garbage recycling system composed of government, non-governmental organizations, enterprise alliances, community public, scavengers and recycling manufacturers makes the recycling rate of waste beverage boxes reach 20%. Relevant experts believe that the top priority is to form a complete chain of packaging waste recycling, classification and comprehensive utilization through market-oriented operation

environmental protection legislation is the key to recycling

experts believe that environmental protection legislation is the key to improve the recycling of composite materials. From a foreign perspective, countries or regions with more developed recycling technology have relatively perfect environmental protection legislation

for example, Japan has implemented the law on promoting the classified recycling of containers and packaging, which stipulates that governments at all levels are responsible for the classified collection, storage and transportation of packaging waste; At the same time, entrust designated enterprises to recycle. Many cities also reward packaging recycling. For example, Osaka, Japan, has set up more than 80 milk carton recycling points in the city, and issued milk carton cards, which can be used to buy books for free after being covered with recycling stamps. Some states in the United States and several European countries have adopted a deposit system for beverage bottles and cans, reducing the weight of waste by 10% to 20% and the volume by 40% to 60%

the European plastic composite industry has made legislative preparations for the recycling of end-of-life vehicles, which will be implemented in the European Union in 2006. The European composite recycling Agency (ecrc) will provide financial support for the recycling of composite materials, so that the recycled materials can be recognized by the market. The ELV recycling law will stipulate relevant regulations for automobile manufacturers and strictly restrict the burial of waste composite materials. According to the regulations, by 2006, manufacturers must ensure that 85% of the composite materials of end-of-life vehicles are recycled, of which at least 80% are reused; In 2015, the recovery rate will reach 95%, and the reuse rate must reach 85%. This measure of the EU will establish a higher threshold for automotive and composite material suppliers to enter the EU market, but it can also encourage material manufacturers to pay attention to the recyclability of materials in design, so as to promote the progress of composite material technology

while formulating policies, government support is also an important means to improve the recovery rate because it is difficult to recover composite packaging. In recent years, the UK has launched a large-scale recycling of paper packaging for beverages. Smith Anderson, a paper packaging production company, recently invested 500000 pounds to build a new plant specializing in recycled paper packaging. The recycling of paper packaging has become an inevitable trend in the packaging industry. 70% of this huge investment was facilitated by the UK liquid food packaging Association (lfcma). The newly built paper packaging recycling plant can recycle about 18000 tons of recycled paper packaging every year. At present, people in the industry believe that in the UK, the recycling of paper packaging is not a technical problem, but how to recycle many paper packaging. In other words, while comprehensively improving national awareness, we must also do a lot of publicity and education work to create a social environment for the comprehensive recycling of paper packaging, so that recycling and regeneration become possible

with the extreme expansion of the world population and the continuous improvement of living needs, the earth's environmental pollution problem is becoming increasingly serious. While creating material civilization, people discharge a large amount of solid, liquid and gaseous substances into the environment. Because composites are multiphase materials, they must have the disadvantage of difficult recovery. However, due to the deteriorating supply of natural resources, composite technology has become one of the important means to improve the utilization rate of materials and improve the market environment. At present, the industry is committed to the research of composite materials that can provide the required performance and biodegradation, and make their degradation products harmless to the environment. However, in the current state of technological development, non degradable composites are still an essential and important material in our society. Making better use of resources and giving full play to their role are the fundamental needs of current social development

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source: Duan Qingsheng of China Plastics and rubber