JPH0315535Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite regenerator material that is easy to use and has elasticity and flexibility even at the cold storage temperature of the regenerator material.

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 target to be cooled with a cold storage material and releasing cold heat (i.e., negative energy). loses its ability to cool the object it attempts to cool.

In the present invention, the cold storage material is cooled by the cold storage of the cold storage material, but the object to be cooled is cooled by the cooling of the cold storage material, so "cooling" in this specification refers to cooling. care must be taken to what will be covered.

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. It is one of a kind.

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 left 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 cooler/heater is 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 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 (publication of 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
These cold storage materials undergo plastic deformation at temperatures around the cold storage temperature, and therefore 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.

Furthermore, since conventional cold storage materials are hydrogels, they have a high specific gravity and feel heavy when lifted.

In order to improve these shortcomings of cold storage materials, the inventor of the present invention conducted extensive research and developed a cold storage material that does not undergo plastic deformation before and after the cold storage temperature of the cold storage material, and further developed the material for practical use. We have completed this invention that allows us to do this.

[Purpose of the invention and summary of the invention]

The purpose of the present invention is to provide a cold storage material that has high cooling efficiency and is easy to use.

The present invention is a cold storage material that has the property of not plastically deforming at temperatures around the cold storage temperature, and includes a high cold temperature cold storage material that has a predetermined cold storage temperature, and a cold storage material that has a cold storage temperature that is lower than the cold storage temperature of the high cold storage temperature cold storage material. The present invention is a composite cold storage material comprising a low cold storage temperature cold storage material having a certain temperature, and is characterized in that a plurality of independent high cold storage temperature cold storage materials are dispersedly present in a low cold storage temperature cold storage material.

[Specific description of the invention] Figures 1 to 4 are drawings showing one embodiment of the composite cold storage material of the present invention, in which 1 is a composite cold storage material,
2 is a high cold storage temperature cold storage material, 3 is a low cold storage temperature cold storage material,
4 is a coating surrounding the composite regenerator material 1, and 5 is a porous body. FIGS. 5 and 6 show an example of a coating surrounding the composite regenerator material 1 of the present invention, in which 6 is a film, 7 is a metal thin film layer, and 8 is a reinforcing material layer.

The cold storage material 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. Regarding the material, the regenerator material used in the present invention is a material that does not easily undergo plastic deformation even if the polymer structure contains liquid. This property is maintained at a temperature range higher than the cold storage temperature, i.e., when the substance contained in the polymer structure is liquid, and at a temperature lower than the cold storage temperature, i.e., when the substance contained in the polymer structure is solid. There is no difference in both cases. Therefore, the cold storage material of the present invention has the property that the shape of the gel body as a whole does not change and does not undergo plastic deformation at temperatures before and after the cold storage temperature. For example, in the cold storage material of the present invention, in a temperature range higher than the cold retention temperature, the entire gel body is elastic and has a konnyaku shape, but in a temperature range lower than the cold retention 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-methylenebisacrylamide, N,N-dimethylenebisacrylamide, N-dimethylacrylamide or formaldehyde, and neutral salts such as potassium chloride, sodium chloride, An aqueous solution of ammonium chloride, calcium chloride, magnesium chloride, their nitrates or their sulfates is treated with a redox catalyst, e.
Materials polymerized by the addition of iron or a reducing agent such as dithionite and a peroxide such as hydrogen peroxide, benzoyl peroxide or peroxodisulfate, thereby gelling the entire material.

2 A material obtained by adding a redox catalyst to the above aqueous solution and further adding polyacrylic acid to the aqueous solution and polymerizing it, thereby gelling the entire material.

(Japanese Patent Application No. 57-177394 (Japanese Unexamined Patent Publication No. 59-66478), Japanese Patent Application No. 57-177395 (Unexamined Japanese Patent Application No. 59-66479), and
(See Japanese Patent Publication No. 102976)) The cooling temperature of these materials can be adjusted to any desired temperature by adjusting the type and amount of neutral salts added. Of course, if neutral salts are not used, the cold storage temperature is close to 0°C.

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

The above-mentioned high cold storage temperature cold storage material 2 in the composite cold storage material 1 of the present invention has a composition of raw materials so as to have a predetermined cold storage temperature during its manufacturing process. Generally, the cold storage temperature of the high cold storage temperature cold storage material 2 is higher than the cooling temperature of the cooling source when storing cold in the composite cold storage material 1, but the freezing temperature of commercially available refrigerator-freezers is -15℃~ Since the temperature is -20°C, the cold storage temperature of the high cold storage temperature cold storage material 2 is preferably higher than -15°C. In this way, when the composite cold storage material 1 of the present invention is used for cold storage, the high cold storage temperature cold storage material 2
is cooled to a temperature lower than its cooling temperature and becomes hard.

In the manufacturing process of the low cold storage temperature cold storage material 3 in the composite cold storage material 1 of the present invention, the composition of raw materials is set so that the cold storage temperature is lower than the cold storage temperature of the high cold storage temperature cold storage material 2. . Generally, the cold storage temperature of the low cold storage temperature cold storage material 3 is lower than the cooling temperature of the cooling source when storing the composite cold storage material 1, but usually it is a temperature lower than -20°C. is preferred. In this way, even if the composite cold storage material 1 of the present invention is used for cold storage, the low cold storage temperature cold storage material 3
Because it is not cooled to its cold storage temperature, it does not become hard and remains elastic.

The composite cold storage material 1 of the present invention is usually wrapped with a suitable water-impermeable coating. The material of this coating is
Although any material may be used as long as it does not allow water to pass through, it is usually preferable to use plastic film.

Plastic films include polyesters such as polyethylene terephthalate, polyethylene terephthalate isophthalate, poly-1,4-cyclohexylene-dimethylene terephthalate, polyethylene oxybenzoate, polycaprolactam, polylaurinlactam, polyhexamethyleneadipamide, polyhexane. Polyamides such as methylene sebaamide, poly-1,4-cyclohexylene adipamide, polydioxyphenyl methane carbonate, polydioxydiphenyl ethane carbonate, polydioxydiphenyl-2,
2-propane carbonate, carbonates such as poly-p-xylene glycol biscarbonate, cellulose esters such as cellulose acetate, fluororesins such as polyvinyl fluoride, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, Films such as polyolefins such as polyethylene, polypropylene, and polybutene, polyvinyl chloride, polystyrene, and polyvinylidene chloride can be used, but from the viewpoint of economy and handling during use, polyethylene terephthalate, polycaprolactam, etc. can be used. Particular preference is given to using polyhexamethylene adipamide or polyhexamethylene adipamide.

A metal thin film layer 7 can be laminated on these plastic films 6 as shown in FIG. By laminating the metal thin film layers 7, not only the appearance becomes beautiful, but also the influence of light from the outside world on the composite regenerator material 1 can be prevented. The metal thin film layer 7 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 evaporation methods, but from an economic point of view It is preferable to use aluminum as the material for the metal thin film layer 7.

When the metal thin film layer 7 is laminated, it is preferable that the cover 4 is embossed. This reveals 4
This has the advantage that not only the appearance becomes beautiful, but also the flexibility of the entire cover 4 increases, making the cold bag easier to use.

As shown in FIG.
The material forming the reinforcing material layer 8 can be any material that can reinforce the film 6.
Any material can be used, but generally woven or non-woven fabrics, paper or warif made from natural or synthetic fibers can be used. The cloth cloth mentioned here is made by stretching polyethylene film or polypropylene film in one direction and tearing the strips in the stretching direction, arranging them in a lattice pattern vertically and horizontally, and gluing the intersections. From an economic point of view, it is preferable to use cloth.

The porous body of the present invention may be made of any material as long as it is a granular body having a large number of pores or bubbles and has a small apparent specific gravity.
For example, pumice, cork, wood wool, various sponges or foamed plastics, foamed molded products such as polystyrene, polyurethane, ABS resin, polyvinyl chloride, polyethylene, polypropylene, phenolic resin, urea resin, epoxy resin, silicone resin, etc. Alternatively, pre-foamed moldings can be used, but porous bodies exhibiting elasticity, e.g.
Preference is given to using expanded polystyrene, expanded polyurethane, expanded polyethylene, expanded polypropylene or sponge. The shape and size of the porous body are not particularly limited, and may be any shape such as spherical, pellet-like, rod-like, flake-like, or crushed piece-like.
It is preferably in the form of coarsely crushed pieces or pellets.

There is no particular restriction on the overall shape of the composite regenerator material of the present invention, such as spherical, spherical, flake, etc.
Although it may have any shape such as a plate shape or a block shape, a plate shape is preferable for convenience of manufacturing.

In the composite cold storage material of the present invention, as shown in FIGS. 3 and 4, a portion of the porous body and the high cold storage temperature cold storage material are exposed on the surface of the composite cold storage material.

The composite cold storage material of the present invention first gels the high cold storage temperature cold storage material, and disperses the obtained gel body in the low cold storage temperature cold storage material before gelation.
It is made by a method of gelling a low-temperature cold storage material. When using a porous body, the porous body is dispersed together with the gel body of the high cold storage temperature cold storage material in the material before gelation of the low cold storage temperature cold storage material, and the low cold storage temperature cold storage material is gelled. Just do it.

[Effect of idea]

When the composite cold storage material of the present invention is used for cold storage, first of all, the water in the hydrous gel of the high cold storage temperature cold storage material freezes and becomes hard, but the low cold storage temperature cold storage material 3 is a flexible and elastic konjac-like material. The state is maintained. Since the high cold storage temperature cold storage material 2 is independently dispersed in the low cold storage temperature cold storage material 2, the composite cold storage material as a whole also maintains a flexible and elastic konjac shape. Since cold storage materials come into soft contact with the object or object to be cooled, they are easy to use and can increase the contact area.
Freezing efficiency is also improved.

In the composite cold storage material of the present invention, the cold storage material itself is
By having the property of not plastically deforming at temperatures around the cold storage temperature, the high cold storage temperature cold storage material 2 can be dispersed into the low cold storage temperature cold storage material 3 for the first time. If the cold storage material itself has the property of being plastically deformed at a temperature higher than its cold storage temperature, if any force is applied during cooling, the two will mix, and the above-mentioned effect will be lost.

A composite cold storage material having a structure in which a porous body is dispersed in a high cold storage temperature cold storage material 2 and a low cold storage temperature cold storage material 3 is easy to use because its apparent specific gravity is small, and the elasticity of the porous body is high. The composite cold storage material as a whole also has the advantage of being more flexible and easier to use.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an embodiment of the composite regenerator material of the present invention, and FIG. 3 is a partially cutaway perspective view of another embodiment of the composite regenerator material of the present invention, and FIG. 4 is a front view showing a vertical cross section of a portion of another embodiment of the composite regenerator material of the present invention. Figure 5 shows
FIG. 6 is a vertical cross-sectional view of an example of the coating of the composite cold storage material of the present invention, and FIG. 6 is a vertical cross-sectional view of another example of the coating of the composite cold storage material of the present invention. Explanation of symbols, 1: Composite cold storage material, 2: High cold storage temperature cold storage material, 3: Low cold storage temperature cold storage material, 4: Coating, 5:
Porous body, 7: metal thin film layer, 8: reinforcing material layer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) High cold storage temperature cold storage material having a predetermined cold storage temperature, which is a cold storage material that does not undergo plastic deformation at temperatures around the cold storage temperature, and cold storage of high cold storage temperature cold storage materials. A composite cold storage material consisting of a low cold storage temperature cold storage material having a cold storage temperature lower than the above temperature, characterized in that a plurality of independent high cold storage temperature cold storage materials are dispersedly present in the low cold storage temperature cold storage material. Composite cold storage material. (2) The cold storage temperature of the high cold storage temperature cold storage material is higher than the cold storage temperature of the cooling source that stores the composite cold storage material, and the cold storage temperature of the low cold storage temperature cold storage material is the cold storage temperature of the cooling source that stores the composite cold storage material. The composite cold storage material according to Claim 1 of the Utility Model Registration Claim, characterized in that the temperature is lower than that of the above. (3) A request for utility model registration characterized in that the cold storage temperature of the high cold storage temperature cold storage material is higher than -15°C, and the cold storage temperature of the low cold storage temperature cold storage material is lower than -20°C. Composite cold storage material according to scope 1 or 2. (4) Claims 1 to 3 of the claims for utility model registration, characterized in that the porous body is dispersed in a low cold storage temperature cold storage material along with a plurality of independent high cold storage temperature cold storage materials. The composite cold storage material described in any of the above. (5) The composite cold storage material according to claim 4 of the utility model registration, characterized in that the porous body has elasticity.