JP6376446B2 - Laminate, vacuum insulation - Google Patents

Description

  The present invention relates to a laminate and a vacuum heat insulating material.

  A vacuum insulation material (VIP: Vacuum Insulation Panel) in which a core material such as urethane foam or glass wool is vacuum-packed with a sheet material is known. This vacuum heat insulating material improves heat insulation performance by suppressing heat conduction by gas.

  Patent Document 1 discloses a low-temperature tank heat insulating material structure that can enhance the effect of incorporating a vacuum heat insulating material used for heat insulation of a low-temperature tank, and can easily perform bonding between heat-insulating panels without gaps. Proposed.

Japanese Patent No. 5453969

By the way, as a heat insulating material for a LNG (Liquid Natural Gas) tank, Patent Document 1 proposes a vacuum heat insulating material embedded in a normal heat insulating material (PUF).
In this case, depending on the thickness of the heat insulating material on the tank side, the vacuum heat insulating material is exposed to an extremely low temperature (for example, −100 ° C.). It is assumed that sex is secured.
However, in the above-described vacuum heat insulating material, the cold resistance of the sheet material covering the core material is not sufficient at about −40 ° C., and continuous use is difficult.
The present invention has been made in view of the above circumstances, and provides a laminate and a vacuum heat insulating material having sufficient cold resistance while ensuring gas barrier properties, mechanical toughness, and seal strength. Objective.

In order to solve the above problems, the following configuration is adopted.
According to the first aspect of the present invention, the laminate includes a base layer, a gas barrier layer disposed inside the base layer and having gas sealing properties, and a heat sealing layer disposed inside the gas barrier layers and having thermoplasticity. And the base layer is formed of at least one of glass fiber, carbon fiber, graphite, and bronze on any one of polytetrafluoroethylene, polyurethane elastomer, and unstretched 6 nylon. one of formed by adding a filler, wherein the gas barrier layer, polypropylene, polyphenylene sulfide, and among the polyimides are formed from at least one, the heat seal layer is formed from an ionomer.
By comprising in this way, the laminated body excellent in gas barrier property, mechanical toughness, and sealing strength can be formed, having sufficient cold resistance with respect to about -100 degreeC.

According to the second aspect of the present invention, in the laminated body, the gas barrier layer in the laminated body of the first aspect may include a functional layer made of a metal.
By configuring in this way, for example, necessary functions such as gas barrier properties, flexibility, mechanical toughness, and seal strength can be added, and accordingly, gas barrier properties, mechanical toughness, etc. Improvements can be made.

According to the third aspect of the present invention, the laminate has a gas seal layer formed between the gas barrier layer and the heat seal layer in the laminate of the first or second aspect, and the gas seal layer is The liquid crystal polymer film may be formed.
By comprising in this way, the further improvement of gas-barrier property etc. can be aimed at in a low temperature environment of about -100 degreeC.

According to the fourth aspect of the present invention, the vacuum heat insulating material includes the laminated body according to any one of the first aspect to the third aspect, and a core material vacuum-packed by the laminated body.
By comprising in this way, a vacuum heat insulating material can be continuously used even in the low temperature environment of about -100 degreeC, for example.

The laminate according to the present invention can have sufficient cold resistance while ensuring gas barrier properties, mechanical toughness, and seal strength.
Moreover, according to the vacuum heat insulating material which concerns on this invention, it can be continuously used in a low-temperature environment.

It is sectional drawing of the vacuum heat insulating material in one Embodiment of this invention. It is sectional drawing of the laminated body in embodiment of this invention.

Hereinafter, the vacuum heat insulating material which concerns on one Embodiment of this invention is demonstrated.
FIG. 1 is a cross-sectional view of a vacuum heat insulating material in an embodiment of the present invention. FIG. 2 is a cross-sectional view of the laminate in the embodiment of the present invention.
As shown in FIG. 1, the vacuum heat insulating material 1 in this embodiment includes a laminated body 2 and a core material 3.
The laminated body 2 is a so-called laminated film. The core material 3 is a heat insulating material made of foamed polystyrene or polyurethane. The laminate 2 covers the core material 3 from the outside. In the laminated body 2 in this embodiment, the inner space is sealed by heat-sealing the periphery of the core material 3. The internal space defined by the laminate 2 is in a vacuum state (vacuum pack). Therefore, the heat transfer in the thickness direction of the vacuum heat insulating material 1 is hindered by the heat insulating properties of the core material 3 and the heat insulating properties by the vacuum.

  As shown in FIG. 2, the laminate 2 described above includes a base layer 10, a gas barrier layer 11, a gas seal layer 12, and a heat seal layer 13 in order from the outside, assuming that the side in contact with the core material 3 is the inside. Yes. The base layer 10, the gas barrier layer 11, the gas seal layer 12, and the heat seal layer 13 are sequentially laminated via an adhesive by a dry laminating method or the like.

  The base layer 10 mainly ensures the mechanical strength of the laminate 2. As the resin constituting the base layer 10, polytetrafluoroethylene, polyurethane elastomer, and unstretched 6 nylon can be used. Further, in the base layer 10, a filler is added to any one of the polytetrafluoroethylene, polyurethane elastomer, and unstretched 6 nylon to improve the strength. As the filler, at least one of glass fiber, carbon fiber, graphite, and bronze can be used. Here, polytetrafluoroethylene has a processing usable temperature range of “−150 to 260 ° C.”. The polyurethane elastomer has a processable temperature range of “−30 to 130 ° C.”. Non-stretched 6 nylon has a processable temperature range of “−60 to 130 ° C.”. Here, the lower limit of the usable temperature range of the polyurethane elastomer is higher than −100 ° C., but since the flexibility at a low temperature is high, when used for the vacuum heat insulating material 1, the polytetrafluoro Cold resistance equivalent to ethylene can be obtained.

The gas barrier layer 11 is disposed inside the base layer 10. This gas barrier layer 11 mainly ensures the gas sealing property in the laminate 2. The gas barrier layer 11 includes a barrier layer body 11a and a functional layer 11b.
Polyethylene terephthalate, polypropylene, polyphenylene sulfide, and polyimide can be used as the resin constituting the barrier layer body 11a. Polyethylene terephthalate has a processable temperature range of “−269 to 200 ° C.”. Polypropylene has a processable temperature range of “−269 to 130 ° C.”. The usable temperature range of polyimide is “−269 to 400 ° C.”. The processable temperature range of polyphenylene sulfide is “−269 to 200 ° C.”.

The functional layer 11b is made of a thin metal layer. The functional layer 11b adds functions such as light shielding properties, moisture proofing properties, and gas barrier properties to the gas barrier layer 11. As the metal constituting the functional layer 11b, aluminum, Cu, Ag, Al ₂ O ₃ , SiO ₂ , or Ag can be used. The functional layer 11b is fixed to the inner surface of the barrier layer body 11a by vapor deposition or adhesion. The functional layer 11b may be omitted as long as it is provided as necessary.

  The gas seal layer 12 mainly ensures the hermeticity of the laminate 2. As the resin constituting the gas seal layer 12, a liquid crystal polymer (LCP) film can be used. The liquid crystal polymer film has a processable temperature range of “−196 to 300 ° C.”. The gas seal layer 12 may be omitted when a gas barrier property is added by the functional layer 11b.

  The heat seal layer 13 is made of a thermoplastic resin. An ionomer can be used as the resin constituting the heat seal layer 13. This ionomer has a processing usable temperature range of “−105 to 100 ° C.”. The heat seal layer 13 is disposed on the innermost layer of the laminate 2. In the laminate 2, the heat seal layers 13 are pressed and heated around the core material 3, so that the heat seal layers 13 are heat-sealed.

  Therefore, according to the laminate 2 of the above-described embodiment, the base layer 10, the gas barrier layer 11, and the heat seal layer 13 of the laminate 2 are each made of a resin having a cold resistance of about −100 ° C. It is possible to form a laminate 2 that has sufficient cold resistance to about −100 ° C. and excellent gas barrier properties, mechanical toughness, and sealing strength.

Moreover, by providing the functional layer 11b, necessary functions such as gas barrier properties and mechanical toughness can be added.
Furthermore, by having the gas seal layer 12 formed of a liquid crystal polymer film between the gas barrier layer 11 and the heat seal layer 13, further improvement of gas barrier properties, etc. in a low temperature environment of about −100 ° C. Can be achieved.

  Furthermore, according to the vacuum heat insulating material 1 of embodiment mentioned above, a vacuum heat insulating material can be continuously used by using the said laminated body 2 also in a 100 degreeC low temperature environment. As a result, the vacuum heat insulating material 1 can be used as a heat insulating material for the LNG tank.

  Note that the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.

For example, in the above-described embodiment, foamed polystyrene and polyurethane are exemplified as the core material 3, but any heat insulating material may be used, and other than foamed polystyrene and polyurethane may be used.
Moreover, in embodiment mentioned above, the case where the laminated body 2 of both sides was heat-sealed on both sides of the core material 3 was illustrated. However, as long as the core material 3 can be disposed in the internal space and the internal space can be in a vacuum state, the position for heat-sealing is not limited to the position of the above-described embodiment. For example, heat fusion may be performed over the entire circumference of the core material 3.

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Laminated body 3 Core material 10 Base layer 11 Gas barrier layer 12 Gas seal layer 13 Heat seal layer

Claims (4)

The base layer,
A gas barrier layer disposed inside the base layer and having gas sealing properties;
A heat seal layer disposed inside the gas barrier layer and having thermoplasticity,
The base layer is
It is formed by adding at least one filler of glass fiber, carbon fiber, graphite, and bronze to any one of polytetrafluoroethylene, polyurethane elastomer, and unstretched 6 nylon,
The gas barrier layer is
Polypropylene, polyphenylene sulfide, and among the polyimides are formed from at least one,
The heat seal layer is a laminate formed of an ionomer.   The laminate according to claim 1, wherein the gas barrier layer includes a functional layer made of a metal. A gas seal layer is formed between the gas barrier layer and the heat seal layer,
The laminate according to claim 1 or 2, wherein the gas seal layer is formed of a liquid crystal polymer film. The laminate according to any one of claims 1 to 3,
And a core material vacuum packed by the laminate.

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