JPH11200240A - Heat-insulating sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat-insulating sheet capable of inhibiting the rise of temperature on the inside of the sheet and maintaining luggage at a constant temperature and useful as a material for the hoods of trucks, etc., by laminating a metal layer to at least one surface of a sheet-like article coated with a thermoplastic resin composition. SOLUTION: This heat-insulating sheet is obtained by coating a material having a sheet form, such as a woven fabric, a knit fabric, a nonwoven fabric or a film with a hermoplastic resin and subsequently laminating a metal layer to at least one surface of the coated sheet-like material. The metal layer has a heat ray-reflecting property expressed by a total light reflectance rate of preferably >=50%, more preferably >=70%, measured according to ASTM D-1003.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating sheet which reflects heat rays efficiently and has excellent heat insulating properties.
In particular, when used as a hood material for a truck, the heat insulating sheet can suppress a rise in the temperature of the liquid in the cargo.

[0002]

2. Description of the Related Art Sheet materials conventionally used as tents, open-stack sheets, hoods for trucks, and the like include:
There are widely known those obtained by impregnating a woven fabric such as polyester with a vinyl chloride resin and those impregnated with a vinyl chloride resin containing a metal oxide such as titanium oxide. This sheet material is effective enough for rain protection and sun protection,
Because there is little heat ray reflection of sunlight and low heat insulation,
There is a problem that hot air is trapped inside the sheet, and the temperature of the load inside the sheet rises and adversely affects the sheet.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and an object of the present invention is to provide a heat insulating sheet for suppressing a rise in temperature inside a sheet and keeping a load at a constant temperature. .

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and have reached the present invention. That is, the present invention is a heat insulating sheet characterized in that a metal layer is laminated on at least one surface of a sheet-like material coated with a thermoplastic resin composition.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. As the thermoplastic resin constituting the thermoplastic resin composition of the present invention, vinyl chloride, polyethylene, polypropylene, ethylene vinyl acetate, polyester, nylon, acrylonitrile, polychloral, and the like can be used. Polyethylene, polypropylene and ethylene vinyl acetate are preferred. When the thermoplastic resin composition contains a compound having a spectral reflectance of 50% or more for electromagnetic waves having a wavelength of 0.4 to 2 μm, it can be preferably used in terms of heat insulation. The compound used herein is not particularly limited as long as the aforementioned spectral reflectance is 50% or more, but titanium oxide, silicon oxide and zinc oxide can be preferably used. The thermoplastic resin composition of the present invention may be composed of only a thermoplastic resin, and other additives such as a filler, a flame retardant,
A coloring agent, a thermosetting resin, a moldability improving material, a fragrance, an antioxidant and the like can be blended.

As the material to be coated with the thermoplastic composition, any material having a sheet form such as a woven fabric, a knitted fabric, a nonwoven fabric, and a film can be used. Specifically, the material is polyester, polypropylene, or the like. It is possible to form a synthetic resin such as nylon, polyvinyl chloride, polyacrylonitrile, polychloral, polyethylene or the like singly or as a mixture. However, a relatively inexpensive polyester having good hygroscopicity and dimensional stability is preferable. A sheet is formed in this way,
In the present invention, a metal layer is laminated on at least one side.

[0007] The metal layer of the present invention is not particularly limited as long as it has heat ray reflectivity, and it is possible to use simple metals and alloys such as gold, silver, copper, aluminum, and stainless steel. Aluminum which is inexpensive and has good moldability is preferred. The heat ray reflectivity is ASTM D 100
The total light reflectance measured in 3 is preferably 50% or more in terms of heat insulation performance, and more preferably 70% or more. In addition, the form is not particularly limited, such as vapor deposition, foil, and plate shape, but when used for a tent, a stacking sheet, a truck hood material, or the like, it is preferable to have flexibility, and vapor deposition and a foil shape are preferable. .

[0008] When the metal layer is provided as the outermost layer of the heat insulating sheet, the heat ray reflectivity of the metal layer is maximized, so that a high heat insulating effect is obtained, which is preferable. As the heat insulating effect, the temperature change of the internal air is preferably 6 ° C./6 hr or less under the conditions of the outside air temperature of 35 ° C., and the temperature of the load installed inside the heat insulating sheet and the inside of the sheet at 25 ° C.

Further, when the metal layer is provided as the outermost layer, the metal layer is oxidized when it comes into direct contact with the outside air, and the heat ray reflectivity of the metal layer is reduced due to abrasion or the like. In such a case, it is preferable to provide at least one resin layer on the surface of the metal layer because oxidation prevention and surface protection can be achieved. The resin layer here is made of vinyl chloride, acrylic,
It is not particularly limited as long as it is a general synthetic resin such as urethane, fluorine, or polyester, but it is important that the heat ray reflectivity of the metal layer is not hindered. The ratio is preferably 90% or more as compared with the case where only a metal layer is used, and a vinyl chloride-based or polyester-based resin film including abrasion resistance is preferred.

When the metal layer surface is used on the high temperature side (sunlight side), heat rays of sunlight are efficiently reflected, which is preferable in terms of heat insulation. However, diffuse reflection of sunlight may cause a problem. . In particular, when used as a hood material for trucks, irregular reflection of sunlight may hinder external traffic. In such a case, it is preferable that the metal layer surface is laminated on only one side of the sheet-like material, and the metal layer surface is preferably used on the low temperature side. Is preferred.

The heat insulating sheet obtained as described above is
It has the effect of suppressing the temperature rise on the low temperature side. Such sheets can also be used for tents, open sheets, truck tops. In particular, it is suitable for maintaining the temperature in transporting liquids such as beer, juice and wine.

[0012]

The present invention will be described below in further detail with reference to examples. In addition, the measurement of heat insulation was performed by the following method.

An aluminum can (18 liter can) filled with water at 25 ° C. is placed under sunlight at an average temperature of 35 ° C. The heat insulation sheet is placed on the can and the internal temperature of the sheet is adjusted. 25 ° C. After 6 hours, the water inside the can and the temperature inside the sheet are measured, and the temperature change from the initial temperature (25 ° C.) is regarded as thermal insulation.

Examples 1 to 5 A plain woven fabric composed of spun polyester fibers was coated with a vinyl chloride resin composition having the following composition to obtain No. 5 canvas.
An aluminum foil having a thickness of 50 μm was laminated on one surface thereof using an adhesive to obtain a heat insulating sheet. The heat insulation property was measured using the aluminum foil surface of the heat insulation sheet on the high temperature side. Vinyl chloride resin 100 parts by weight Dioctyl phthalate (plasticizer) 60 parts by weight Stabilizer 5 parts by weight Calcium carbonate 10 parts by weight Titanium oxide (average particle diameter 0.3 μm) 0 to 30 parts by weight (see Table 1)

Example 6 No. 5 canvas having 10 parts by weight of titanium oxide having the composition of the vinyl chloride resin composition shown in Examples 1 to 5 was added to a 50 μm thick cloth.
A polyester film was formed by laminating a vapor-deposited film obtained by vapor-depositing aluminum to a thickness of 600 angstroms using an adhesive such that the vapor-deposited surface was on the canvas side.
An m-thick vinyl chloride resin film was laminated using an adhesive to obtain a heat insulating sheet. The heat insulating property was measured by using the aluminum vapor-deposited surface of the heat insulating sheet on the high temperature side.

Example 7 On one side of No. 5 canvas having 10 parts by weight of titanium oxide having the composition of the vinyl chloride resin composition shown in Examples 1 to 5,
An aluminum foil of 0 μm was laminated using an adhesive to obtain a heat insulating sheet. The heat insulation property was measured using the aluminum foil surface of the heat insulation sheet on the low temperature side.

Comparative Example 1 Using the same No. 5 canvas as in Example 6, the heat insulating property was measured.

Comparative Example 2 Insulation was measured using No. 5 canvas containing 30 parts by weight of titanium oxide having the composition of the vinyl chloride resin composition shown in Examples 1 to 5.

Table 1 shows the evaluation results of the heat insulating properties of the sheets obtained in Examples 1 to 7 and Comparative Examples 1 and 2.

[0020]

[Table 1]

The heat insulating sheet obtained in the present invention (Examples 1 to 5)
7) is smaller in the temperature change inside the sheet than in Comparative Examples 1 and 2. Furthermore, the temperature change of the water in the can is very small,
It turns out that it is excellent in heat insulation.

[0022]

As described above, the present invention comprises a sheet formed by laminating a metal layer on a sheet-like material coated with a thermoplastic resin composition. It has the effect of suppressing the temperature rise on the (lower temperature side) and significantly reducing the temperature change of storage materials and luggage represented by liquid materials.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI D06M 11/45 F16L 59/08 11/83 D06M 15/248 F16L 59/08 17/00 G // D06M 15/248 17/00

Claims (12)

[Claims] 1. A heat insulating sheet comprising a sheet-like material coated with a thermoplastic resin composition and a metal layer laminated on at least one surface. 2. The heat insulating sheet according to claim 1, wherein the thermoplastic resin constituting the thermoplastic resin composition is vinyl chloride, polyethylene, polypropylene, ethylene vinyl acetate. 3. The thermoplastic resin composition has a wavelength of 0.4 to
The heat insulating sheet according to claim 1, further comprising a compound having a spectral reflectance of 2 μm of an electromagnetic wave of 50% or more. 4. The heat insulating sheet according to claim 3, wherein the compound is titanium oxide, silicon oxide or zinc oxide. 5. The heat insulating sheet according to claim 1, wherein the total light reflectance of the metal layer is 50% or more. 6. The heat insulating sheet according to claim 1, wherein the metal layer is aluminum. 7. The heat insulating sheet according to claim 1, wherein the metal layer is a vapor deposition layer or a foil. 8. The total light reflectance in a state where a resin layer is laminated on the surface of the metal layer is 90% as compared with the case where only the metal layer is used.
The heat insulating sheet according to any one of claims 1 to 5, wherein a resin layer having a percentage of at least 10% is laminated. 9. A heat insulating sheet, wherein the resin layer according to claim 8 is a vinyl chloride or polyester resin film. 10. A method for using a heat insulating sheet, comprising using the heat insulating sheet according to any one of claims 1 to 9 and using the metal layer surface side on a low temperature side. . 11. The heat insulating sheet according to claim 1, wherein a temperature change when the heat insulating sheet is arranged at a boundary between 25 ° C. and 35 ° C. is 6 ° C./6 hr or less. 12. The heat insulating sheet according to claim 1, which is for storing or transporting a liquid.