JP2005213307A - Cold-keeping material and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold-keeping material and a method for producing the same, wherein the cold-keeping material can be formed into the one with small total weight by using a water-soluble polymer resin as a raw material in an amount as small as possible, and long time temperature keeping can be achieved to products to be kept cold. <P>SOLUTION: A cold-keeping body 2 is obtained by kneading reverse osmosis membrane water, which is produced from common water such as tap water by a reverse osmosis membrane method, and a gelling agent mainly composed of the water-soluble polymer resin. The cold-keeping body 2 is held in a package 1 formed from a film such as plastics and hermetically packaged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cold insulating material and a method for manufacturing the cold insulating material that can maintain a temperature for a long time by using as little water-soluble polymer resin as possible.

  Conventionally, it is known to produce a gel-like cold insulating material by mixing a water-soluble polymer and water (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 6-122871

In this case, water used for mixing with the water-soluble polymer was exclusively used as raw water such as city water (tap water), spring water, and well water.
However, these raw waters have large water molecule clusters, so they do not mix well with water-soluble polymers, and as a result, they have a short temperature holding time. To compensate for this, more water-soluble polymers are used. It corresponded by doing.

  The present invention has been made in order to solve the above-mentioned problems. A reverse osmosis membrane water is produced from a general water such as tap water by a reverse osmosis membrane method, and the reverse osmosis membrane water and a water-soluble polymer resin are produced. A water-soluble polymer which becomes a raw material as little as possible by kneading a gelling agent mainly composed of the above to obtain a cold-retaining body, and containing the cold-retaining body in a package made of a bag and sealingly packaging it. It is possible to provide a method for manufacturing a cold insulating material and a cold insulating material that can form the whole weight of the cold insulating material lightly using a resin and can maintain a temperature for a long time with respect to the cold object. It is aimed.

The means of the present invention for achieving the above-mentioned object is as follows:
In the cold insulation material in which the cold insulation is sealed and packaged in the package,
The cold insulator has a structure of a cold insulator in which a gelling agent mainly composed of a water-soluble polymer resin and reverse osmosis membrane water obtained by a reverse osmosis membrane method using general water are kneaded.

And
Reverse osmosis membrane water is produced from general water by the reverse osmosis membrane method, and the reverse osmosis membrane water and a gelling agent mainly composed of a water-soluble polymer resin are kneaded to obtain a cold insulation body. Is in a manufacturing method of a cold insulation material that is sealed and packaged in a package made from a film.

Also,
The reverse osmosis membrane method is used to generate reverse osmosis membrane water in which the water molecule cluster of the general water is reduced, and the reverse osmosis membrane water and a gelling agent mainly composed of a water-soluble polymer resin are kneaded. Thus, a cold insulator is obtained, and the cold insulator is housed in a package formed by a film and sealed and packaged.

  By using a water-soluble polymer resin as a raw material as little as possible, the entire weight of the cold insulating material can be molded lightly, and the temperature of the object to be cooled can be maintained for a long time.

Next, an example of the implementation of the cold insulating material according to the present invention will be described based on the drawings.
In FIG. 1, A is a cold insulation material, and a cold insulation body 2 is hermetically packaged in a packaging body 1, and is basically composed of the packaging body 1 and the cold insulation body 2.

The package 1 described above is formed into an appropriate shape such as a palm bag or a three-sided body by a plastic film or a composite of the plastic film and a film such as a metal foil.
After the cold insulator 2 described later is filled, the filling opening is hermetically packaged by means such as a conventional heat seal.

  The above-mentioned cold insulator 2 uses a water-soluble polymer resin molded into a gelled form as a raw material. Specifically, for example, an acrylic acid-based compound or a natural thickener, carboxymethylcellulose sodium salt (CMC) It is a gelling agent mainly composed of a water-soluble high molecular substance such as cellulose, and if necessary, a stabilizer or preservative is added. In order to obtain viscosity (gel form), reverse osmosis membrane water is added and kneaded in a predetermined manner.

This reverse osmosis membrane water is obtained by the reverse osmosis membrane method using general water, such as tap water, spring water, and well water, which can be easily obtained.
By this reverse osmosis membrane method, for example, in a tank partitioned into two compartments by a semipermeable membrane, ordinary water is accommodated in a tank on one side, and the one side tank is pressurized, whereby the semipermeable membrane is The water that has passed through is removed by foreign substances such as impurities by the semipermeable membrane, the water cluster is once decomposed and its molecular weight is reduced, and is stored in the other tank.

The cold insulator 2 formed by kneading the water-soluble polymer resin and reverse osmosis membrane water has a blending ratio of water-soluble polymer resin: reverse osmosis membrane water = 3% by weight: 97% by weight to 0.5%. % By weight: 99.5% by weight, preferably 1.5% by weight: 98.5% by weight to 0.6% by weight: 99.4% by weight.
Even when the water-soluble polymer resin is 3% by weight or more, the refrigerating performance (temperature holding time, etc.) is hardly changed, and on the contrary, the swelling speed is slow and the viscosity when gelled becomes high and it is difficult to mold. Further, when the water-soluble polymer resin is 0.5% by weight, sufficient hardness for maintaining the function as a cold insulating material cannot be obtained.

In the formation of the cold insulator 2, when the water-soluble polymer resin and the reverse osmosis membrane water are kneaded, foreign substances such as impurities are removed from the reverse osmosis membrane water, and the molecular weight of the cluster of the reverse osmosis membrane water is reduced. Since the reverse osmosis membrane water is made small, the reverse osmosis membrane water uniformly enters between the water-soluble polymer resin having a network structure, and is intermixed with the water-soluble polymer resin sufficiently and uniformly. be able to.
Thereby, at the time of the kneading, not only the swelling speed of the water-soluble polymer resin is greatly increased to improve the molding efficiency, but also the hardness of the finished cold insulator 2 can be greatly increased, The swelling volume also increases.

Therefore, the amount of the water-soluble polymer resin used can be greatly reduced. If the so-called conventional product has a temperature holding time equivalent to that of a conventional product, the volume and weight of the cold insulator 2 can be reduced, and when used for a freshness-keeping material, the container is used for storing and packaging the freshness-keeping material. In this case, the storage space is not taken, the weight can be suppressed as much as possible during transportation, and the packing volume can be reduced.
Further, even when the weight is reduced and the volume is reduced, the temperature holding time can be maintained for a long time.
This difference is remarkably shown in the performance comparison between the present embodiment shown in FIG. 2 and the conventional comparative example.

(Example 1)
Cellulose (trade name H-960, manufactured by Hymo Sub Co., Ltd.), which is a gelling agent, is used as the water-soluble polymer resin, and each of the powdery gelling agent and reverse osmosis membrane water generated from tap water, A cold insulating material 2 of 500 g was prepared at a blending ratio of 0.7% by weight: 99.3% by weight, and filled and packaged in a package 1 made of nylon polyethylene to obtain a cold insulating material A. (According to a general method of manufacturing a cold insulation material.)

(Example 2)
Cellulose (trade name H-960, manufactured by Hymo Sub Co., Ltd.), which is a gelling agent, is used as the water-soluble polymer resin, and each of the powdery gelling agent and reverse osmosis membrane water generated from tap water, 40 g and 50 g of the cold insulator 2 were prepared at a blending ratio of 0.7 wt%: 99.3% by weight, and filled in and packed in a package 1 made of nylon polyethylene to obtain a cold insulator A. (According to a general method of manufacturing a cold insulation material.)

(Comparative example (conventional product) 1)
As the water-soluble polymer resin, cellulose (trade name H-960, manufactured by Hymo Sub Co., Ltd.), which is a gelling agent, is used, and 1.0% by weight of each of the powdery gelling agent and tap water is 99.99%. A cold-retaining body of 500 g was prepared at a blending ratio of 0% by weight and filled and packaged in a package made of nylon polyethylene to obtain a cold-retaining material. (According to a general method of manufacturing a cold insulation material.)

(Comparative example (conventional product) 2)
As the water-soluble polymer resin, cellulose (trade name H-960, manufactured by Hymo Sub Co., Ltd.), which is a gelling agent, is used, and 1.0% by weight of each of the powdery gelling agent and tap water is 99.99%. 50 g of a cold insulator was prepared at a blending ratio of 0% by weight, and the cold insulator was obtained by filling and packaging in a package made of nylon polyethylene. (According to a general method of manufacturing a cold insulation material.)

  The comparative test by the manufacturing method of said Examples 1 and 2 and Comparative Examples 1 and 2 was done.

  According to this, in Example 1 and Comparative Example 1, as shown in the performance comparison graph in FIG. 2, while the cold insulation material of Comparative Example 1 is less than 4 hours, the cold insulation capacity decreases. The cold insulating material A of Example 1 was able to maintain the temperature for a long time of 6 hours or more. That is, it was shown to have a long-term temperature holding ability.

Moreover, in Example 2 and Comparative Example 2, as shown in the performance comparison graph in FIG. 3, the cold insulating material of Example 2 prepared at 40 g although the cold insulating material of Comparative Example 2 has 50 g. A shows that the melting state changes with the passage of time substantially the same as in Comparative Example 2 and melts in 1.2 hours. Thus, if the same temperature holding ability is exhibited, Example 2 The cold insulation material A can be reduced by about 20% in the total weight.
Furthermore, 50 g of the cold insulation material A in Example 2 shows that dissolution started after 1.8 hours. As a result, the cold insulation material A of Example 2 exhibits a temperature holding ability that is a little longer than 40 minutes than the cold insulation body of Comparative Example 2, and in comparison between Example 2 and Comparative Example 2, In the case of the amount of the cold insulator, Example 2 was able to extend the temperature holding time by about 20%.

It is the perspective view which fractured | ruptured a part which shows one Example of the cold insulating material regarding this invention. It is explanatory drawing which shows the performance comparison graph of the cold insulating material by the Example of this invention in FIG. 1, and the cold insulating material by the conventional comparative example. It is explanatory drawing which shows the further another performance comparison graph of the cold insulating material by the Example of this invention in FIG. 1, and the cold insulating material by the conventional comparative example.

Explanation of symbols

  A ... Cold insulation material. 1 ... Packaging body. 2 ... Cold insulator.

Claims (3)

In the cold insulation material in which the cold insulation is sealed and packaged in the package,
The cold insulating material is characterized in that a gelling agent mainly composed of a water-soluble polymer resin and reverse osmosis membrane water obtained by a reverse osmosis membrane method using general water are kneaded.   Reverse osmosis membrane water is produced from general water by the reverse osmosis membrane method, and the reverse osmosis membrane water and a gelling agent mainly composed of a water-soluble polymer resin are kneaded to obtain a cold insulation body. A method for producing a cold insulation material, wherein the film is housed and sealed in a package made from a film.   The reverse osmosis membrane method is used to generate reverse osmosis membrane water in which the water molecule cluster of the general water is reduced, and the reverse osmosis membrane water and a gelling agent mainly composed of a water-soluble polymer resin are kneaded. A method for producing a cold insulation material, comprising: obtaining a cold insulation body, and housing the cold insulation body in a package made of a film and sealingly packaging the package.

Images