A kind of transparent ultra-high barrier composite film and preparation method thereof
A composite film, ultra-high technology, applied in the field of flexible packaging film, can solve the problems of limited use range, insufficient bonding force between the vapor deposition layer and the substrate film, etc., to achieve excellent barrier properties, less material and consumption, and continuous and stable barrier properties.
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Embodiment 1
[0063] The present embodiment is a method for preparing a transparent ultra-high barrier composite film, comprising the following steps:
[0064] 1) Preparation of biaxially oriented polyamide film of substrate layer:
[0065] S1. All raw materials are melted, plasticized and extruded through their respective extruders according to the formula ratio and flow out through a coat hanger die, and the temperature of each area is set at 250°C;
[0066] S2. Use a low-pressure air knife to attach the melt to the cold drum to form a thick sheet, wherein the thickness of the thick sheet is 180 μm, and the temperature of the cold drum is 20 °C;
[0067] S3. After heating the thick sheet, use a magnetic suspension biaxial stretching machine for synchronous stretching, wherein the stretching temperature is 195°C, and the stretching ratio is 3.0*3.3;
[0068] S4, heat setting the stretched film, wherein the setting temperature is 210°C, and the setting time is 8s, and then the film is cool...
Embodiment 2
[0101] The difference between Example 2 and Example 1 is that the coating liquid components and coating parameters for coating the protective layer and the vapor deposition enhancement layer are adjusted, and the inorganic oxide in the vapor deposition inorganic oxide is SiOx.
[0102] The transparent microwave-heatable high-barrier biaxially oriented polyamide composite film in this embodiment includes a four-layer film structure. Plating reinforcement and substrate layers.
[0103] The base material layer is a biaxially stretched polyamide film, and the polyamide in the base material layer is a PA6-PA66 copolymer. The base material layer includes an upper surface layer, a first surface layer, an intermediate layer, a second surface layer and a lower surface layer, the inorganic oxide vapor deposition layer covers the vapor deposition enhancement layer, and the vapor deposition enhancement layer covers the upper surface layer; the The upper surface layer is a corona-treated ...
Embodiment 5
[0249] The difference between Example 5 and Example 1 is that the coating parameters and preparation process conditions for coating the protective layer and the vapor deposition enhancement layer are adjusted.
[0250] The transparent microwave-heatable high-barrier biaxially oriented polyamide composite film in this embodiment includes a four-layer film structure, and the film layer structure is, from top to bottom, a coating protective layer, an inorganic oxide vapor deposition barrier layer, and a vapor deposition layer. Plating reinforcement and substrate layers.
[0251] The base material layer is a biaxially stretched polyamide film, and the polyamide in the base material layer is a PA6-PA66 copolymer. The base material layer includes an upper surface layer, a first surface layer, an intermediate layer, a second surface layer and a lower surface layer, the inorganic oxide evaporation layer covers the evaporation enhancement layer, and the evaporation enhancement layer co...
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Abstract
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