JPS6144132Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cold insulation piece with high cooling efficiency.
More specifically, the present invention relates to a cold insulating piece that has high cooling efficiency and can be manufactured at low cost.

In this specification, "cold storage" refers to cooling a cold storage material with a cooling source to store cold heat (i.e., negative energy); in other words, the cold storage material cools the object to be cooled by cold storage. Gain the ability to cool down.

In this specification, "cooling" refers to cooling an object or object to be cooled with a cold storage material to release cold heat (i.e., negative energy), in other words, cooling by cooling. The material loses its ability to cool the object it is trying to cool.

In the present invention, the cold storage material is cooled by the cold storage of the cold storage material, but the cooling of the cold storage material cools the object to be cooled, so "cooling" in this specification refers to cooling. It is necessary to pay attention to the target.

In this specification, the "cold storage temperature" of the cold storage material means that when the cold storage material is cooled by a cooling source (i.e., when the cold storage material is stored), water contained in the hydrous gel of the cold storage material freezes and the cold storage material is cooled. This is the temperature at which latent heat corresponding to the heat of fusion of the material is absorbed by the cooling source (i.e., the freezing temperature of the water contained in the hydrous gel); When cooling (that is, when cooling a cold storage material), the frozen material contained in the hydrous gel of the cold storage material melts, and the object or target to be cooled transfers latent heat corresponding to the heat of fusion of the frozen material to the cold storage material. (i.e., the melting temperature of the water contained in the hydrogel). Therefore, when the water contained in the hydrous gel is pure water, its cooling temperature is approximately 0°C, but when other substances are dissolved, it varies depending on the type and content thereof.

[Background of the invention and prior art]

A cold storage material is a material that acquires the ability to cool an object or object to be cooled by storing cold, and loses the ability to cool the object or object to be cooled by cooling, and is a type of refrigerant. It is.

In principle, the typical cold storage material known so far is water, but since water is ubiquitous and inexpensive, ice that stores water can be released. After cooling, storing the coolant again is not carried out unless there are extreme circumstances. Carbon dioxide also has the function of a cold storage material when it is in the form of dry ice, but as dry ice is allowed to cool, it becomes gaseous, so it is virtually impossible to recover it. Furthermore, "liquid nitrogen" also has the function of a cold storage material, but since its product is gaseous, its recovery is practically impossible.

When considered as a cold storage material, water is widely used because it has a large heat of fusion at the cold storage temperature and the material itself is inexpensive. The disadvantage is that this must be removed from the system.

To overcome this drawback, several cold storage materials that can repeatedly store and release cold have been developed. For example, a cold insulator made by filling a rubber or plastic bag with a water-containing gel obtained by adding borax or boric acid to an aqueous solution of polyvinyl alcohol, and a polyacetic acid obtained by dispersing polyvinyl acetate in an aqueous solution of polyvinyl alcohol. There is a cooler/heater in which a similar bag is filled with a water-containing gel obtained by adding borax or boric acid to vinyl emulsion (Utility Model Publication No. 45-27082). A cold storage material made of a hydrous gel and polyacrylic acid containing at least 2
There is also a cold storage material made of a hydrous gel obtained by adding a compound having epoxy groups (Japanese Patent Publication No. 57-28505
Since these cold storage materials undergo plastic deformation at temperatures in front of their cold storage temperature, they cannot maintain a constant shape. Also, if the cold storage material is stored at a temperature lower than its cold storage temperature,
The cold storage material remains in its previous irregular shape,
It becomes hard, so it is very difficult to use. For this reason, in conventional cold storage materials, the cold storage temperature is set as low as possible to prevent the cold storage material from freezing and becoming hard during cold storage. However, the reason why the cold storage material does not harden during cold storage is that the water in the hydrous gel in the cold storage material does not freeze, and the latent heat corresponding to the heat of fusion cannot be used during cooling. This will reduce the cooling efficiency of the material and the cooling capacity.

In order to improve these drawbacks of cold storage materials, the inventor of the present invention has conducted extensive research and has developed a cold storage material that does not undergo plastic deformation before and after the cold storage temperature of the cold storage material, and has also put this into practical use. They completed the present invention which can be used.

[Purpose of the invention and summary of the invention]

An object of the present invention is to provide a cold insulation piece with high cooling efficiency.

Another purpose of this invention is to have high cooling efficiency.
The purpose is to provide a cold insulation piece that can be manufactured at low cost.

The cold storage piece of the present invention consists of a cold storage material that does not undergo plastic deformation at temperatures around the cold storage temperature, a sheet, and a coating layer that is in close contact with the top surface of the cold storage material and sheet on top of the sheet.

[Specific explanation of the idea]

1, 2 and 3 show an embodiment of the present invention, in which 1 is a cold insulating piece, 2 is a cold storage material, 3 is a sheet, 4 is a covering layer, and 6 is a cold storage material. is an adhesive layer having a release paper 7.

Further, FIG. 4 shows an example of a sheet with 3
is a sheet, and 5 is a metal thin film layer. FIG. 5 shows an embodiment of the covering layer, where 4 is the covering layer and 5 is a metal thin film layer.

The cold storage material 2 of the present invention is a gel body containing a liquid with high specific heat and heat of fusion, and it is thought that the liquid is retained in the polymer structure of the gel body, which is polymerized into a three-dimensional network. However, the cold storage material 2 used in the present invention is a material that is resistant to plastic deformation even if the polymer structure contains liquid. And this property is
Temperatures in a range higher than the cold storage temperature, i.e., when the substance contained in the polymer structure is liquid, and temperatures below the cold storage temperature, i.e., when the substance contained in the polymer structure is solid. No difference on both sides. Therefore, the cold storage material 2 of the present invention
has the characteristic that the shape of the gel body as a whole does not change and does not undergo plastic deformation at temperatures around the cold storage temperature. However, the cold storage material 2 of this invention is
In a temperature range higher than the cold storage temperature, the entire gel body is elastic and has a konnyaku shape, but in a temperature range lower than the cold storage temperature, the entire gel body remains in the same shape and becomes hard.

A cold storage material having such characteristics is produced, for example, by the following method.

1 acrylamide or methacrylamide, crosslinking monomers such as N,N-methylenebiscrylamide, N,N-dimethylenepisacrylamide, N-dimethylacrylamide or formaldehyde, and neutral salts, such as
An aqueous solution of potassium chloride, sodium chloride, ammonium chloride, calcium chloride, magnesium chloride, their nitrates or their sulfates is treated with a redox catalyst, such as ferrous sulfate, or a reducing agent such as dithionite, and hydrogen peroxide, peroxide, etc. A material that is polymerized by the addition of a peroxide such as benzoyl oxide or peroxodisulfate, thereby gelling the entire material.

2 A material obtained by adding a redox catalyst to an aqueous solution obtained by adding polyacrylic acid to the above aqueous solution and polymerizing it, thereby turning the entire material into a gel.

(Patent Application No. 177394 of 1980, Patent Application No. 177395 of 1988, and patent application titled "Method for Manufacturing Cold Storage Material" dated December 4, 1980) These materials are being added to the above. By adjusting the type and amount of the salts added, the cold storage temperature can be adjusted to any desired temperature. Of course, if neutral salts are not used, the cold storage temperature is close to 0°C.

The cold storage material 2 of the present invention is not limited to the above-mentioned materials, but any material can be used as long as it does not undergo plastic deformation at temperatures around the cold storage temperature. can be used.

The sheet 3 in the cold storage piece 1 of the present invention is one of the materials for covering and packaging the cold storage material 2, and is usually
Cardboard, cardboard or plastic sheets are used. These sheets 3 may be sheets made of a single material, but may also be laminated sheets made of two or more kinds of materials. Also, by making a hole of an appropriate size at one end of this sheet,
It is also possible to make the cooling piece hangable.

The coating layer 4 in the cold preservation piece 1 of the present invention is used to cover and package the cold storage material 2 on the sheet 3 together with the sheet 3, and is made of various film-like materials, such as paper, waterproof paper, woven fabric, and non-woven fabric. , cellophane, those coated with plastic, or a plastic film can be used.Furthermore, a plastic molded article pre-formed into the shape of the cold insulating piece 1 can also be used. These coating layers 4 may be made of a single material, or may be a coating layer made of two or more materials laminated.

When plastics are used as the material for forming the sheet 3 or the coating layer 4, polyesters such as polyethylene terephthalate, polyethylene terephthalate isophthalate, poly 1,4-cyclohexylene-dimethylene terephthalate, polyethylene oxybenzoate, polycaprolactam , polyamides such as polylaurin lactam, polyhexamethylene adipamide, polyhexamethylene sebacamide, poly-1,4-cyclohexylene adipamide, polydioxyphenyl methane carbonate, polydioxydiphenyl ethane carbonate, Polydioxydiphenyl
Carbonates such as 2,2-propane carbonate, poly-p-xylene glycol discarbonate, cellulose esters such as cellulose acetate, polyvinyl fluoride, polytetrafluoroethylene, and fluorine such as tetrafluoroethylene-hexafluoropropylene copolymer. Although resins such as polyolefins such as polyethylene, polypropylene, and polybutene, polyvinyl chloride, polystyrene, and polyvinylidene chloride can be used, in consideration of economic efficiency and handling during use, polyethylene terephthalate, polyethylene terephthalate,
Particular preference is given to using polycaprolactam or polyhexamethylene adipamide.

When a laminated sheet or a laminated film is used as the sheet 3 or the covering layer 4, the metal thin film layer 5 can be laminated to the plastic sheet or film. By laminating the metal thin film layers 5, not only the appearance becomes beautiful, but also the influence of light from the outside world on the cool storage material 2 can be prevented. The metal thin film layer 5 may be a metal foil, a metal evaporated layer formed by a vacuum evaporation method, or a metal thin film layer formed by an ion plate method or a metal sputtering method. It may be metal. For example, aluminum, zinc, gold, silver, chromium, nickel, copper, selenium, magnesium fluoride, zinc sulfide, and silicon monoxide are well-known materials that can be used in vacuum deposition methods, but from an economical point of view, aluminum It is preferable to use this as the material of the metal thin film layer 5.

On the back side of the sheet 3 of the cold insulation piece 1 of the present invention,
A suitable adhesive member, for example an adhesive layer 6 with a release paper 7 as shown in FIG. 3, can be applied. By attaching the attachment member, when the cold insulation piece 1 is used, it can be attached to an appropriate place, for example, to the bottom surface of the lid of a cold storage container.
By using it in this way, the warmed air above the cold storage container is constantly cooled, so cooling efficiency can be improved.

The cold insulation piece of the present invention is manufactured as follows.

(1) Cool storage materials 2 formed in advance into a suitable shape, such as a pine box shape or a short cylinder shape, are arranged on a sheet 3 at appropriate intervals, and a plastic film forming a covering layer 4 is placed on top of the cold storage materials 2. After that, the air under the plastic film is removed and the product is vacuum packed.

(2) Form a plastic material or plastic film into the shape of the coating layer 4 shown in Fig. 2 by appropriate means, turn it upside down, and place the raw material before gelling by heating the regenerator material into it. Fill. A sheet 3 is placed on top of this and adhered to the covering layer 4 by suitable means.

[Effect of idea]

In the cold storage piece of the present invention, the cold storage material 2 and the coating layer 4 are in close contact with each other, so when storing and releasing cold from the cold storage piece, cold heat is transmitted only through the coating layer 4 to the cold storage material 2 or the object that requires cooling. It will be done.
For this reason, the cold storage piece of the present invention has the advantage of high cold storage efficiency.

Furthermore, the cold storage piece of the present invention can be manufactured by the above-mentioned manufacturing methods, and these manufacturing methods enable mass production, so the cold storage piece of the present invention has the advantage that it can be manufactured at a low cost. There is.

These advantages are that the cold storage material in the cold storage piece of the present invention has a property that it does not undergo plastic deformation at temperatures before and after the cold storage temperature, and as a result, the cold storage material 2 This can only be achieved by having the property of not changing its shape.

Conventional cold storage materials are plastically deformed at temperatures higher than the cold storage temperature, and therefore cannot maintain a constant shape during cooling. For this reason, in order to maintain a certain shape when wrapped in film, the material must be wrapped in film, so the material used to wrap the cold storage material is limited to one that is strong and fairly thick. On the other hand, since the cold storage material 2 in the cold insulation piece of the present invention has the property of not being plastically deformed at a temperature higher than the cold storage temperature, it can always maintain a constant shape. For this reason, in the cold storage piece of the present invention, there is no need to maintain the shape of the cold storage material 2 by the coating layer 4 surrounding the cold storage material 2. Therefore, the coating layer 4 in the present invention may be thin and flexible, and there is an advantage that there is a wide range of materials that can be used for it.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the cold insulation piece of the present invention, Figure 2
The figure is a partially cutaway front view of one embodiment of the cold insulating piece of the present invention, FIG. 3 is a partially cutaway front view of another embodiment of the cold insulating piece of the present invention, and FIG. 4 is a longitudinal section of the sheet. The figure and FIG. 5 are longitudinal cross-sectional views of the coating layer. Drawing code, 1: Cold insulation piece, 2: Cold storage material, 3:
Sheet, 4: Covering layer, 5: Metal thin film layer, 6: Adhesive layer, 7: Release paper.

Claims (1)

[Claims for Utility Model Registration] (1) A cold storage material that does not undergo plastic deformation at temperatures around the cold storage temperature, a sheet that contacts the cold storage material on one surface, and the top surface of the cold storage material and the sheet on top of this sheet. A cold insulation piece characterized by comprising a coating layer that adheres to. (2) The cold insulation piece according to claim 1 of the utility model registration, characterized in that the sheet is a plastic sheet. (3) The cold insulation piece according to claim 2 of the utility model registration, characterized in that the plastic sheet has a metal thin film layer. (4) The cold insulation piece according to any one of claims 1 to 3 of the utility model registration claim, wherein the covering layer is a plastic film. (5) The cold storage piece according to any one of claims 1 to 3 of the utility model registration claim, which is a plastic container in which the coating layer is preformed. (6) The cold insulation piece according to any one of claims 1 to 5 of the utility model registration claim, wherein the coating layer has a metal thin film layer. (7) The cold insulation piece according to any one of claims 1 to 8 of the utility model registration claim, which has an adhesive member on the back side of the sheet.