The most popular green plastic in the world

2022-07-26
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Global green plastics (Part 1)

the so-called green plastics refer to a large class of new plastics that have the same stability and functionality as ordinary plastic products in use, but can be compressed after use or can be safely biodegraded in soil, water and other environments. The raw materials of green plastics such as polylactic acid are not fossil resources (such as oil), but plant resources. Therefore, it can be expected to solve a series of problems such as environment, waste disposal and resource problems

main green plastics and their identification and expression systems

from the perspective of the preparation methods and components of green plastics under research and development, they can be divided into three categories: starch, microorganism and chemical synthesis; From the perspective of raw materials, it can be divided into two categories: plants and petroleum; From the basic physical properties, it can also be divided into soft materials such as PE and hard materials such as polystyrene and polyester

in Japan, green plastics are defined as plastics that can be used as common plastic products, and can be decomposed into carbon dioxide and water causing great pressure on environmental protection by natural microorganisms and decomposition enzymes. In Europe, the chemical foaming agent is used for foaming, and so is the definition in Europe and the United States. In the 1980s, the disintegrating degradable plastics developed in the United States with PE and starch as the main components formed small fragments after disintegration, which caused environmental pollution. They are incomplete degradable plastics, thus causing false publicity and legal proceedings. In recent years, the introduction of Japanese disintegrating materials from overseas has become a problem. In order to represent the world standard biodegradable test method for green plastics, the international organization for Standardization (ISO) announced in may1999 that iso14851, 14852 and 14855 have come into force. These test methods have also developed and published the Japanese industrial standard (JIS) method in Japan, which are k6950, k6951 and k6953 respectively. These standard test methods are the basic methods for evaluating green plastics. So far, countries all over the world are preparing recognition and expression systems to distinguish green plastics, ordinary plastics and disintegrating materials. Europe now has a system of identification and representation of materials that can be compressed together with organic wastes. In Japan, there are also systems that can confirm biodegradability and safety. With the further development of the compression processing system being prepared, Japan will gradually form a recognition representation system at the same level as that in Europe

the biodegradable plastic leixia developed by Mitsui Chemical Co., Ltd. of Japan has the decomposability that can be compressed and treated like new waste. At present, it has obtained the strict German certification for suitable compressed materials (din54900)

improvement of laws and regulations and green plastics

in recent years, with the expansion of green plastics market, countries all over the world are perfecting relevant laws and regulations. At present, Europe has established the packaging decree on promoting the recycling and recycling of packaging containers and the relevant decree on restricting the organic wastes buried in the soil. The decree on promoting the compression and treatment of organic wastes is being actively formulated and prepared

the compression treatment method for organic wastes such as new garbage, weeds and fallen leaves is to adjust the environmental problems caused by incineration and landfill, that is to say, the recycling treatment method for biological organic wastes has been actively adopted in Europe and the United States. The compression treatment of biodegradable packaging containers has also been widely recognized as a part of the recycling method in the packaging decree. Under this background, the green plastic market in Europe, which focuses on the treatment of new garbage bags, compression treatment and other related materials, is expanding year by year, and the annual consumption has reached about 10000 tons

in addition, the following contents are clearly recorded in the German Packaging decree and compression treatment decree: green plastics mainly refer to renewable resources that can be processed and restored into raw materials. Polylactic acid and other plant-based green plastics are one of the most suitable materials that can be compressed together with organic wastes

in Japan, many laws and regulations related to green plastics, including the already implemented packaging container recycling law, have been formally established in the spring of 2000, such as the promotion law of food recycling resources, the green shopping law, the household appliance recycling law, etc., which have constituted the basic laws and regulations to promote the formation of a resource recycling society. According to the provisions of the packaging container recycling law, since April 2000, all resins except polyester (PET) have been listed as recycling objects and classified into other plastics. At present, green plastics are also classified into other plastics. However, with the gradual increase of circulation in the future, the recycling of green plastics, that is, the preparation for compression treatment together with new garbage, can become the non object confirmed by the recycling method. In the Promotion Law on the recycling of food resources, the compression treatment of food waste is stipulated. Green plastics are developing in the direction of being treated together with materials that can be compressed. In the future, with the preparation and improvement of such laws and regulations, it is expected that green plastics will be used in the field of packaging containers and compressible materials. Therefore, the control of decarburization layer depth is an important aspect of performance control in the production of high-strength and excellent spring steel. Moreover, according to the provisions of the waste treatment law implemented in 1997, waste materials such as large-scale agricultural films and non-woven fabrics have been prohibited from being incinerated on site, which increases the treatment cost. This has increased people's concern about green plastic materials that can be landfilled and compressed after use

if about 6.8 million tons of plastic, accounting for about 5% of the world's plastic production, are converted into green plastic polylactic acid raw materials, about 9.9 million tons of sugar raw materials will be required. At present, sugar raw materials can be produced mainly as plant resources. (to be continued)

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