Application Of Pvdc And Market Prospect
pvdc development process When pvdc was first introduced, it was mainly processed into composite film and used in the packaging of weapons and ammunition during World War II. The world's first linear polymer pvdc obtained through laboratory polymerization was in 1930. American Dow Chemical Company first industrialized it. Because the initial period coincided with "World War II" and mainly used in military packaging, which gave a layer of mystery to the pvdc industrial technology, and thus became the United States dow chemical company for many years not to declassify, not to transfer an industrial technology.
At the end of the 50s and the beginning of the 60s, it was gradually transferred to food packaging, and then gradually applied to the field of pharmaceutical packaging, etc. With the acceleration of modern packaging technology and the pace of modern life, the popularity of microwave ovens and refrigerators, the amount of cling film has increased sharply, making the application of pvdc more popular. At this time, several companies developed industrial technology of pvdc products, and pvdc started to reach large-scale overall development in western developed countries. The new high barrier material evoh appeared in 1980s, because of its recyclable performance, once threatened the development of pvdc, but due to the sharp decline of the barrier function of evoh under high humidity, and failed to develop further, including the biaxially stretched nylon film, can not replace the many excellent functions of pvdc.
After the 1990s, because the world's understanding of pvdc products further deepened, so it has gained great development, especially in the Gulf War in the early 1990s, the U.S. military food all pvdc flexible packaging, not only packaging light and fast, but also to ensure that the basic color and flavor of food remains unchanged, especially the only pvdc to meet the U.S. military proposed shelf life of military packaging should reach 3 years this demanding requirements.
Therefore, the application status of pvdc as a barrier packaging film has been consolidated and deepened. The German government has given pvdc packaging the green mark green dot, which is the green packaging recognized by the government. vdc can be copolymerized with many kinds of monomers, but at present there are only three types with real commercial value: Pvdc/pvc, pvdc and pvdc/acrylate copolymers.
