Characteristics and research and development of th

Characteristics and research and development of environment-friendly functional materials (III)

after China's entry into the WTO, due to the reduction of tariffs, the import tax of plastic resin will be reduced by 60%. China's plastic packaging industry has greater development space, and the food flexible packaging industry also has a better development prospect. Polyester: at present, 77% of the bottle polyester resin in the world is used for food packaging, and only 23% of non food and continuous molding packaging. Food bags are not only more reliable, but also mainly carbonated beverage bottles, accounting for about 50% of the total. Other beverage packaging accounted for 21%, edible oil and salad packaging accounted for about 6%. In the past five years, the annual growth rate of polyester bottles has reached 18%. With the improvement of people's living standards, the requirements for packaging materials are also increasing, and polyester packaging containers just meet this requirement. Especially in beverage packaging, polyester bottles have gradually replaced PVC bottles, tin cans and aluminum cans with their excellent performance

ct material: vessels made of CT plastic have little difference from other food packaging containers on the surface, but their internal quality has changed greatly. According to experts, this kind of plastic is a new composite material made by blending about half of the talc powder produced in Liaoning Province into polypropylene plastic. CT can not only withstand the change of output voltage, but also know the force. At high temperature, its function is similar to that of PSP plastic products commonly known as "foam plastic", and its volume is only 1/4 of the latter. In this way, many troubles caused by large volume are avoided during recycling, and extremely favorable conditions are created for eliminating the negative impact on the environment

corn plastic: not long ago, American researchers developed a kind of corn plastic packaging material that is easy to decompose. It extracts three genes that can produce plastics from bacteria that produce biopolymers, and then transfers them to rape plants. After a period of time, a plastic polymer liquid is produced, and a rape plastic can be obtained after refining and processing. The packaging tree material or fast food packaging material made of this kind of plastic can decompose by itself after being discarded, and there is no pollution residue

wheat plastic: This is the use of wheat flour mixed with glycerol, glycol, silicone oil and other dry, and then hot pressed into a translucent thermoplastic film. The advantage of packaging food with wheat plastic is that bacterial plastic can be decomposed by microorganisms: British researchers have recently developed a PHB bacterial plastic. It is first cultivated with sugar, which is beneficial to the improvement of the production and manufacturing level of special tires in China and other countries. A bacterium is then processed into a material similar to polypropylene. This kind of material is non-toxic and easy to biodegrade. It is an ideal material for processing and making food packaging bags. At the same time, there is no pollution to the environment after abandonment

functional packaging we know that some composite functional materials are obviously more economical and reasonable than all composite functional materials, so the industry has developed a variety of functional packaging materials. The common ones are rust proof type, anti discoloration type, insect proof type, mold proof type, fresh-keeping type, nano type, etc. Due to the requirements of modern life, fresh-keeping packaging has developed rapidly. There are more than 100 series of fresh-keeping functional materials that have been successfully developed

green packaging in the green environmental protection revolution, packaging waste usually adopts recycling, reuse, fuel oilization technology, but for flexible composite plastic film, classified recycling and reuse is still a big problem, while using combustion or landfill treatment, its emissions of dioxins or heavy metal harmful substances are still polluting the environment. For this reason, foreign countries have carried out research and developed environmental friendly films. Due to the addition of active oxides in this environmental friendly film, when carrying out waste combustion treatment, on the one hand, it promotes combustion, on the other hand, it reduces the formation of dioxide, and also reacts with heavy metals to effectively prevent the dissolution of heavy metals in residual ash. It is known as "clean film" and attracts attention