JPS61252149A - Composite sheet consisting of fluorocarbon resin layer and metallic layer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a composite sheet consisting of a fluororesin layer and a metal layer, and is applicable to packaging materials, materials for cooking containers, printed circuit board materials, and packaging materials for storing hydrogen storage alloys. Regarding composite sheets used in fields such as

<Conventional technology> Conventionally, composite sheets consisting of a fluororesin layer with excellent chemical resistance and heat resistance and a metal layer with excellent electrical conductivity, thermal conductivity, and gas barrier properties can be used in many applications, but fluororesin Because of its extremely low surface tension, it was considered extremely difficult to bond fluororesin and metal together. Therefore, conventional methods include treating the surface of a fluororesin sheet with a metal sodium-naphthalene method and then applying an adhesive to attach the metal, activating the surface by plasma etching or ion beam etching, and attaching the metal. Composite sheets have been provided by methods such as coating the sheet surface with adhesive functional groups and pasting metal by plasma deposition or ion beam.

<Problems to be solved by the invention> Composite sheets produced by the above-mentioned conventional method require complicated manufacturing processes, making the product itself expensive, the fluororesin may discolor, and the fluororesin layer and metal layer are There are problems such as unreliable adhesion. Generally speaking, composite sheets obtained by conventional methods have a relatively high flexural modulus and are therefore hard, which limits the range of their use.

The present invention has been made to solve these problems, and has a structure that allows a composite sheet that has excellent bonding properties between a fluororesin layer and a metal layer and can also be provided with flexibility to be easily and inexpensively provided. It is.

<Means to Solve and Protect the Problem> The present invention is a composite sheet in which a porous layer and a non-porous layer each made of a fluororesin are integrally bonded, and a metal layer is laminated on the porous layer side. It is characterized by:

<Example> Embodiments of the present invention will be described based on the drawings.

In Figures 1 and 2, (1) is a nonporous sheet made of fluororesin, ('2J is a porous sheet made of fluororesin,
(3) is a metal layer, and the non-porous sheet (1) and the porous sheet (2) are joined together by known means such as melt adhesion, and the surface of the porous sheet (2) has a metal layer. Layer (3
) is formed.

As the metal of gold B Ji (31), metals such as aluminum, copper, gold, and silver are appropriately selected depending on the purpose of use, and semiconductor materials such as silicon and gallium may also be used.These metal layers (3) , for example, P, V, D, by vacuum evaporation, ion blasting sputtering, etc.
(Physical Vapor Deposit
C, V by n method, such as plasma, photoexcitation, etc.

[) , (Chemical Vapor
It is formed by the DepO3tion) method or the like.

The gold JII layer (3) formed by the above method is formed inside the pores of the porous sheet (2) as shown in FIG. 2, so that the bond between the fluororesin sheet and the metal layer is becomes physically strong.

The thickness of the metal layer (3) is not particularly limited, and is appropriately selected depending on the intended use of the composite sheet. In addition, if it is necessary to increase the thickness of the metal layer depending on the purpose of use, the thickness can be increased by further applying metal plating to the laminated metal 1i1 (3) as shown in Figure 3. You can get it. In FIG. 3, (1), (a and (3)) are the same as above, and (4) is a metal plating layer.

In addition, if the surface of the porous sheet (2) is treated with adhesive functional groups using plasma C, V, D, etc., and then the metal layer (3) is formed using the method described above, physical bonding can be achieved. In addition to this, chemical bonding force is also imparted, so that the bond between the fluororesin sheet and the metal layer (3) becomes even stronger.

Examples of the fluororesin in the nonporous sheet (1) and the porous sheet (2) include tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene copolymer, perfluoroalkoxyethylene resin, vinylidene fluoride resin, etc. However, from the viewpoint of chemical resistance and heat resistance, tetrafluoroethylene resin is preferable. However, if both nonporous sheet (1) and porous sheet ('2 Therefore, one sheet (preferably a non-porous sheet) is made of a tetrafluoroethylene-hexafluoropropylene copolymer or a perfluoroalkoxyethylene resin that can be melt bonded to a tetrafluoroethylene resin. In addition, when both the nonporous sheet (1) and the porous sheet (2) are made of tetrafluoroethylene resin, one is made of unstretched and unsintered tetrafluoroethylene resin, and the other is made of unstretched and unsintered tetrafluoroethylene resin. After making sintered polytetrafluoroethylene resin and bonding the two together by rolling, etc., they are simultaneously sintered to form a bonded two-layer composite sheet.

The pore size and porosity of the porous sheet (2) are not particularly limited, but from the viewpoint of adhesion to metal, they are each 0.
1 to 10/a and 30 to 95 vol% are preferred.

In addition to the above-mentioned sheets, the porous layer and nonporous layer made of fluororesin may also be formed in the form of a thinner film.

The composite sheet according to the present invention is a printed circuit board material that takes advantage of the low dielectric constant of fluororesin, a material for OAII machines, conveyors, etc. that takes advantage of the electrical conductivity and low friction sliding properties, and a material that utilizes the gas-filling properties of metal and fluororesin. Utilizing its heat resistance, chemical resistance, and flexibility, it can be used in a wide range of fields as a packaging material for heat carriers, medicines, foods, etc. In addition, it can be used in a wide range of fields, such as packaging materials for heat media, medicines, and foods. It can also be used as a packaging material for sheet and hydrogen storage alloys.

<Effects of the Invention> As is clear from the above description, the composite sheet according to the present invention is made of metal F! i (3) is a porous sheet made of fluororesin (2) is formed not only on the surface but also inside the pores, so the bond between the metal and fluororesin is strong, making it a composite material with excellent integrity and durability. It becomes a sheet.

Furthermore, since the composite sheet of the present invention has a porous layer ('2J) in the fluororesin layer, the thickness and type of the non-porous II (1) and the metal B (3) can be appropriately selected.

It has the advantage of being able to produce composite sheets with low bending elastic modulus and flexibility.

Furthermore, the composite sheet of the present invention does not require surface treatment in conventional methods such as etching by the metal sodium-naphthalene method due to its structure, so the manufacturing process is simplified.
This configuration can contribute to reducing manufacturing costs since a surface treatment device is not required.

Therefore, according to the present invention, an inexpensive composite sheet consisting of a fluororesin layer and a metal layer can be provided.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and Fig. 1 is a sectional view of a composite sheet according to the invention, Fig. 2 is a partially enlarged sectional schematic view of Fig. 1, and Fig. 3 is a metal layer (3). FIG. 2 is a cross-sectional view of a composite sheet of the present invention with metal plating applied thereon. (1)...Fluororesin nonporous sheet, (a...Fluororesin porous sheet, (3)...Metal layer, (4)
...Metal plating layer patent applicant Sumitomo Electric Industries Co., Ltd. Representative Patent attorney Hirokatsu Kamei (and one other person)

Claims (1)

[Claims] 1. A metal layer is laminated on the porous layer side of a composite sheet in which a porous layer and a nonporous layer each made of a fluororesin are integrally bonded. A composite sheet consisting of a fluororesin layer and a metal layer. 2. The composite sheet according to claim 1, wherein the porous layer made of fluororesin is tetrafluoroethylene resin. 3. The pore diameter of the porous layer made of fluororesin is 0.1 to 10
The composite sheet according to claim 1 or 2, which has a porosity of 30 to 95 vol%. 4. The nonporous layer made of fluororesin is tetrafluoroethylene.
The composite sheet according to claim 2 or 3, which is a hexafluorinated propylene copolymer. 5. The composite sheet according to claim 2 or 3, wherein the nonporous layer made of a fluororesin is a perfluoroalkoxyethylene resin. 6. The composite sheet according to claim 2 or 3, wherein the nonporous layer made of fluororesin is tetrafluoroethylene resin.