High-temperature-resistant vacuum barrier composite film and preparation method thereof

Abstract

The technical problem to be solved by the invention is to provide a high-temperature-resistant vacuum barrier composite film which is wider in application range and capable of effectively increasing the heat-resistant temperature and a preparation method thereof. The composite film comprises a high-temperature-resistant layer, a metal layer, a gas-blocking and oxygen-blocking layer and a heat-sealing layer which are sequentially compounded from the outer layer to the inner layer, the high-temperature-resistant layer is made of a polyimide film layer, and the metal layer is made of an aluminum foil layer. The gas-blocking and oxygen-blocking layer is prepared by compounding one or more of an aluminized polyethylene terephthalate film layer, a nylon film layer, an aluminized ethylene-vinyl alcohol copolymer film layer, a casting polypropylene film layer and a high-barrier transparent film layer, and the heat-sealing layer is prepared from a polyethylene layer. The outermost layer of the composite film adopts the polyimide film which has outstanding high-temperature resistance, radiation resistance, chemical corrosion resistance and electric insulation performance, and the polyimide film is compounded with the aluminum foil, so that the radiation resistance and the gas barrier performance of the whole film material are enhanced, and the service life of the composite film material is greatly prolonged. The film is suitable for popularization in the vacuum insulation field.

Description

technical field [0001] The invention relates to the field of vacuum heat insulation, in particular to a high temperature resistant vacuum barrier composite film and a preparation method thereof. Background technique [0002] Vacuum insulation panel (VIP board) is the abbreviation of Vacuum Insulation Panel in English. It is a kind of vacuum insulation material. It is composed of filling core material and vacuum protection surface. The coefficient can be greatly reduced, as low as 0.0015w / m.k, and it does not contain any ODS materials. It has the characteristics of environmental protection and high efficiency and energy saving. It is currently the most advanced high-efficiency thermal insulation material in the world. [0003] Vacuum insulation panels generally include a core material, a vacuum barrier composite film and an adsorbent. The adsorbent is placed in the core material, and the vacuum barrier film wraps the core material. After vacuum packaging, it becomes a vacuum ...

AI Technical Summary

Problems solved by technology

The vacuum composite membrane composed of the above structures has the following problems: the service temperature of the vacuum insulation panels made by it is ≤80°C, and the instantaneous maximum heat-resistant temperature is only 180°C

[0004] For vacuum insulation panels, its excellent thermal insulation performance is suitable for use in all thermal insulation fields. However, due to the limitation of its use temperature, it can only be used in household appliances such as refrigerators, freezers, water heaters, and cold chains such as containers and refrigerated boxes. Logistics cannot be used for thermal insulation in smelting, aerospace, chemical industry, etc. In order to expand the application field of vacuum insulation panels, it is necessary to solve the environmental restrictions of its use and prolong its life.

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