At present, 90% of the domestic market is monopolized by Japanese and Japanese companies such as DNP/Showa Denko and South Korean companies such as Lisun. Domestic companies, such as Xinlun Technology and Fosu Technology, are also accelerating the development and production of aluminum plastic film, but there is still a certain gap compared with Japanese and Korean companies. The thickness of the aluminum-plastic film has different specifications. Its structure is composed of three kinds of materials, which are CPP layer, AL layer and nylon layer from inside to outside.
There are two important manufacturing methods of aluminum plastic film: thermal method and dry method. The thermal process is the bonding between the aluminum layer and the CPP layer with MPP, and the synthesis by hot pressing at a certain temperature. Under high temperature, the van der Waals force in MPP will be destroyed and aged, and the anti-short-circuit performance will decline sharply. At the same time, due to the destruction of its intermolecular structure, the toughness is reduced, and it is easy to crack in the molding process.
Dry process for PP and aluminum layer in the middle of the binder directly composite, the use of insulating binder, without high temperature treatment, short-circuit performance is better than the thermal process. And the binder itself ductility is better than PP layer, not high temperature treatment will not affect the molding.
As the core material of secondary batteries, the aluminum plastic film market is known for its high technical barriers and high profits. The market is rising rapidly with an annual compound growth rate (CAGR) of 42%.
It is understood that because of the high difficulty in the production process of aluminum plastic film, most of the domestic aluminum plastic film in the corrosion resistance of electrolyte, deep performance and other aspects do not pass, so the global and domestic aluminum film market is important by the Japanese DNP printing, Showa Electric and a few Japanese companies monopoly.
However, with the progress of domestic battery technology, domestic aluminum plastic film has also made considerable progress. Ming crown, for example, the development of new material reference in solar battery back membrane adhesive of accumulated rich experience, success in the use of imported aluminum-plastic film adhesives developed lithium-ion battery aluminum-plastic film, on the basis of a lot of material selection and process optimization experiment, has successfully developed products can replace imported adhesives. The successful development and use of the adhesive not only broke the technical monopoly of the foreign industry, but also made a big step forward for the complete localization of aluminum plastic film.
