JP4905758B2 - Heat storage material - Google Patents

Description

  The present invention relates to a heat storage material that utilizes endothermic heat accompanying a phase change of a substance.

  A heat storage material is used for the purpose of keeping a body part such as the entire head in a cooled state (see, for example, Patent Document 1). Moreover, food, such as a cake and meat, is stored in a food cold box container together with a heat storage material to cool the food (for example, see Patent Document 2).

  As these heat storage materials, a material filled with a gel-like or purine-like water-absorbing resin mixed with a cryogen such as ethylene glycol (for example, see Patent Document 1), ethylene glycol, salt, or the like (for example, see Patent Document 2) is disclosed. ing.

  However, these have problems such that the heat of fusion per unit amount is small, and the melting point is low, so that it is not suitable for cooling at room temperature.

Further, as a heat storage material near normal temperature, a heat storage material made of a solid mixture obtained by mechanical means of a mixture of hexadecane and tetradecane and a hydrocarbon-based organic polymer is disclosed (for example, see Patent Document 1). However, since this solid mixture contains more than 16.6% by weight of solid polymer (thermoplastic elastomer and polyethylene), a reduction in heat storage capacity cannot be avoided. In addition, since it contains a large number of such solid polymers, this solid mixture is insufficiently flexible and receives a force during use and needs to be deformed following the force (for example, the human body). It is not suitable for use in the cooling of a predetermined part.
JP-A-8-55979 JP-A-5-85575 Japanese Patent No. 3169422

  An object of the present invention is to provide a heat storage material that is suitable for cold preservation at around room temperature, has a small amount of polymer to be mixed with hexadecane or tetradecane, and has excellent flexibility.

The gist of the present invention is that
One or more hydrocarbons selected from hexadecane, pentadecane, and tetradecane;
C It is a heat storage material comprising a gel-like product composed mainly of a linear low density polyethylene having a side chain length of ₈ minutes and a gelling agent selected from natural fat and oil fatty acids.

  The ratio of the gelling agent to the total amount of the hydrocarbon and the gelling agent may be 6 to 16% by weight.

In addition, the gist of the present invention is that
One or more hydrocarbons selected from hexadecane, pentadecane, and tetradecane;
C is a method for producing a heat storage material that cools a mixture in which a linear low-density polyethylene having a side chain length of ₈ minutes and a gelling agent selected from natural fats and fatty acids are mixed in a molten state. It is in.

  In the method for producing the heat storage material, the mixture can be cooled by charging it into a liquid having a liquid temperature of 20 ° C. or higher.

  Moreover, the place made into the summary of this invention exists in the thermal storage material storage body containing the said thermal storage material and the storage container which accommodated this thermal storage material.

  Furthermore, the gist of the present invention is that the storage container used for the heat storage material storage body is a container for a heat storage material storage body provided with a non-slip means on the outer surface of the storage container. .

  According to the present invention, there is provided a heat storage material that is suitable for cold storage near normal temperature, has a low gelling agent content, and is excellent in flexibility.

The aspect of the heat storage material of the present invention will be described. The heat storage material of the present invention is composed of one or a plurality of hydrocarbons selected from hexadecane, pentadecane, and tetradecane (referred to as heat storage hydrocarbons in the following description), linear low-density polyethylene, and natural oil-based fatty acids. It is a gel-like product formed by mixing a selected gelling agent. The linear low density polyethylene used in the present invention is a polyethylene having a molecular structure mainly composed of a linear chain and having a side chain having a length corresponding to C ₈ (octene), and has a specific gravity of about 0. 91. Absorption of latent heat of fusion at the time of melting of the hydrocarbon for heat storage is used for cold insulation.

Natural fat fatty acids are carboxylic acids having the C chain, preferably is produced as a component of animal fats and vegetable oils are those having a C chain of C ₈ -C ₂₆ minutes length, mixed with heat storage hydrocarbons By doing so, a good gel-like product is obtained. Also, good gel-like material is obtained by mixing a linear low density polyethylene having a side chain of the heat storage for hydrocarbons and C ₈ minutes long. Gelation can be performed, for example, by heating the mixture of both to raise the temperature, and cooling after becoming a dissolved state. This cooling can be performed by rapidly charging the dissolved mixture into a liquid such as water or alcohol. Alternatively, it may be cooled by contacting with gas.

  The content rate of the gelatinizer in a gel-like material is 6-30 weight%. More preferably, it is 6 to 16% by weight in view of the flexibility of the heat storage material. In addition, when this content rate exceeds 16 weight%, the elasticity modulus of a thermal storage material will increase rapidly, but a softness | flexibility is maintained if a content rate is 30 weight% or less.

  Since the size of the side chain of the linear low density polyethylene is similar to the size of the C chain of the hydrocarbon for heat storage, a stable gel can be obtained even at a low content of 6 to 16% by weight. In addition, due to the similarity in size, even when the content exceeds 16% by weight, the thermal storage hydrocarbon and the gelling agent are sufficiently mixed at the molecular level, and the flexibility is maintained by gelation. The

  It has been found that whether or not gelation is possible or the state of gelation is influenced by the mixing ratio of the two and the cooling temperature, as well as the length of the side chain of the linear low density polyethylene. Further, in the present invention, it has been found that if the linear low density polyethylene is 6% by weight or more based on the total amount of the heat storage hydrocarbon and the linear low density polyethylene, a good gel can be obtained. . Furthermore, it has been found that the temperature of the water into which the mixture in the dissolved state is charged is preferably 20 ° C. or higher, and more preferably 30 to 100 ° C. for obtaining a stable gel. If the temperature of the charged water is below 20 ° C., a stable gel may not be obtained.

As a gelling agent, linear low density polyethylene having a side chain of C ₈ minutes (hereinafter referred to as LLDPE-2), high pressure method low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene (PP), Table 1 shows the gelation state when each was used. (The contents of LLDPE, LDPE, and HDPE are described in the left column of Maruzen Co., Ltd. II-336). In Table 1, hexadecane as a heat storage hydrocarbon and each of these gelling agents were mixed so that the gelling agent had a ratio of 6% by weight with respect to the total weight.

  In the gelation operation, the mixture of the heat storage hydrocarbon and the gelling agent is heated to 160 ° C., and after being dissolved, is added to water at each temperature of 4, 30, 50, 70, and 100 ° C. It was carried out after rapid charging and rapid cooling. In the table, ◯ indicates that an elastic solid product was obtained. Δ indicates that it was half-gelled. X shows that it does not gelatinize.

  As can be seen from Table 1, an elastic solid gel is obtained only when LLDPE-2 is used as a gelling agent among these levels, and an elastic solid gel is not obtained in other cases. . Thus, it has been found that the type of gelling agent is extremely important as a factor for obtaining an elastic solid-state gel using the heat storage hydrocarbon.

Table 2 shows the gelation state when tetradecane is used as the heat storage hydrocarbon and the same operation as in Table 1 is performed. However, the gelation operation was carried out by heating the mixture of the heat storage hydrocarbon and the gelling agent to 140 ° C., and then rapidly charging the mixture into water at 30 ° C. after being in a dissolved state. As the gelling agent, the side chain of the linear low density polyethylene (referred to as LLDPE-1 or less) that of the C ₄ minutes was used.

  Table 3 shows the gelation state when hexadecane is used as the heat storage hydrocarbon and the same operation as in Table 2 is performed.

  From Tables 2 and 3, an elastic solid gel is obtained only when LLDPE-2 is used as a gelling agent among these levels, regardless of the type of hydrocarbon for heat storage, and in other cases, it is elastic. A solid gel with no can not be obtained.

  The content ratios of hexadecane, pentadecane, and tetradecane in the heat storage hydrocarbon vary depending on the cold storage temperature when the cold storage is performed using the heat storage material. For example, in cold insulation at a temperature of 6 ° C. or in the vicinity thereof, a hydrocarbon for thermal storage mainly composed of tetradecane is used. The heat storage hydrocarbon has a melting point of 6 ° C. or a temperature in the vicinity thereof, and absorption of latent heat of fusion at the time of melting is used for cooling. In cold storage at a temperature of 17 ° C. or in the vicinity thereof, a heat storage hydrocarbon mainly composed of hexadecane is used. The melting point of the hydrocarbon for heat storage is 17 ° C. or a temperature in the vicinity thereof, and absorption of latent heat of fusion at the time of melting is used for keeping the cold. In cold storage at a temperature of 10 ° C. or in the vicinity thereof, a hydrocarbon for thermal storage mainly composed of pentadecane is used. Alternatively, a mixture of hexadecane and tetradecane, or a mixture of hexadecane, pentadecane, and tetradecane is used. Moreover, in the cold preservation at a certain intermediate temperature of 6 to 17 ° C., the mixing ratio of hexadecane, pentadecane and tetradecane is appropriately changed and used.

  FIG. 1 shows the relationship between the mixing ratio of both of the hydrocarbons for heat storage in the system of hexadecane and tetradecane and the peak of the heat of fusion of the gel. As can be seen from FIG. 1, the melting point peak (↓) shifts to high temperature as the ratio of hexadecane increases. In this way, the melting point of the gel can be controlled by changing the mixing ratio of the two.

  It was proved by the following experiment that the heat storage material of the present invention composed of such a gel-like material is excellent in retention of the hydrocarbon for heat storage as a solvent and excellent in flexibility. Compression elastic modulus (C) and solvent retention of a gel-like product obtained by mixing a heat storage hydrocarbon having a mixing weight ratio of 90:10 of hexadecane and tetradecane as a sample and LLDPE-2 at a predetermined mixing ratio Table 4 shows (S) and melting enthalpy (H). The gel-like material was obtained by heating the mixture of the heat storage hydrocarbon and LLDPE-2 to 160 ° C., and then rapidly throwing it into 40 ° C. water and rapidly cooling it. The weight ratio (W) of the gelling agent to the total weight of the hydrocarbon for heat storage and LLDPE-2 is 6.0, 7.5, 9.0, 10.5, 12.0% by weight. Mixed at different levels.

  The compression modulus (C) is a curve graph showing the relationship between the compression load and the amount of compression displacement when a sample obtained by cutting this gel-like material into a cube having a side of 1 cm is compressed by a compression tester at a speed of 1 mm / sec. The initial rise slope of the curve was obtained.

The solvent retention (S) is the weight ratio (%) of the amount of solvent in the gel after compressing this cube with a load of 4.9 × 10 ⁴ Pa to the amount of solvent in the gel before compression. It is. In this compression, a filter paper was laid under the cube to absorb the solvent that oozed from the cube during compression.

From Table 4, when the content of LLDPE-2 in the mixture (gel before compression) is 6% by weight or more, 74% by weight or more of the solvent is retained even after compression with a load of 4.9 × 10 ⁴ Pa. When the content of LLDPE-2 is 9% by weight or more, it can be seen that 98% by weight or more of the solvent is retained even after compression with a load of 4.9 × 10 ⁴ Pa. Thus, the heat storage material of the present invention exhibits excellent solvent retention despite the low content of LLDPE-2.

  Further, the heat storage material of the present invention can have a content of LLDPE-2 of 15% by weight or less, and has a very low compression elastic modulus as shown in Table 4 while maintaining excellent solvent retention. A heat storage material can be obtained.

On the other hand, 100 parts by weight of a hydrocarbon for heat storage and 25 parts by weight of a solidifying agent obtained by mixing polyethylene (specific gravity 0.91) and a thermoplastic elastomer in a weight ratio of 3: 2 are mixed and melted and then cooled. Had a high compressive modulus of 50 × 10 ⁵ Pa and was flexible.

  Table 5 shows the state of a mixture obtained by mixing tetradecane and LLDPE-2 as a sample at a predetermined ratio. The mixture was obtained by heating the mixture of the heat storage hydrocarbon and LLDPE-2 to 140 ° C., and then rapidly throwing it into water at 30 ° C. and rapidly cooling it. In the table, ◯ indicates that an elastic solid product was obtained. Δ indicates that it was half-gelled. X shows that it does not gelatinize. From Table 5, it can be seen that if the content of LLDPE-2 in the mixture is 6% by weight or more, it gels and an elastic solid product is obtained, but if it is less than 6% by weight, it does not completely gel.

  Table 6 shows the state of a mixture obtained by mixing hexadecane and LLDPE-2 as a sample at a predetermined mixing ratio. The mixture was obtained by heating the mixture of the heat storage hydrocarbon and LLDPE-2 to 140 ° C., and then rapidly throwing it into water at 30 ° C. and rapidly cooling it. In the table, ◯ indicates that an elastic solid product was obtained. Δ indicates that it was half-gelled. X shows that it does not gelatinize. From Table 5, it can be seen that if the content of LLDPE-2 in the mixture is 6% by weight or more, gelation is obtained and an elastic solid product is obtained.

  In the present invention, natural fat and oil fatty acids can be used as the gelling agent as described above. A mixture of gel-like products obtained by mixing a mixture of hexadecane and tetradecane as a sample with a heat storage hydrocarbon of 90:10 and a natural fatty acid fatty acid mainly composed of stearic acid at a predetermined mixing ratio. Table 7 shows the state. The mixture was obtained by heating the mixture of the heat storage hydrocarbon and the natural fat-and-fatty acid fatty acid to 80 ° C., rapidly entering the 30 ° C. water after being dissolved, and quenching. In the table, ◯ indicates that an elastic solid product was obtained. X shows that it does not gelatinize. From Table 7, it can be seen that if the content of the natural fat-and-fatty acid fatty acid in the mixture is 6% by weight or more, gelation is obtained and an elastic solid product is obtained, but if it is less than 6% by weight, gelation does not occur.

  Compressive elasticity of a gel-like product obtained by mixing a heat storage hydrocarbon with a mixing weight ratio of hexadecane and tetradecane of 90:10 as a sample and a natural fat-based fatty acid mainly composed of stearic acid at a predetermined mixing ratio Table 8 shows the rate (C) and the solvent retention (S). The gel-like product was obtained by heating the mixture of the heat storage hydrocarbon and the natural fat-and-fatty acid fatty acid to 80 ° C., and then rapidly throwing it into water at 30 ° C. and rapidly cooling it.

From Table 8, if the content of the natural fatty acid fatty acid in the mixture (gel-like product before compression) is 6% by weight or more, 64.9% by weight or more after compression with a load of 4.9 × 10 ⁴ Pa. It can be seen that when the solvent is retained and the content of LLDPE-2 is 9% by weight or more, 74.5% by weight or more of the solvent is retained even after compression with a load of 4.9 × 10 ⁴ Pa. As described above, the heat storage material of the present invention exhibits excellent solvent retention despite the small content of natural fats and fatty acids.

  Moreover, as shown in Table 8, the heat storage material of the present invention using a natural fat-and-fatty acid fatty acid can have a content of natural fat-and-fat fatty acid of 15% by weight or less, while maintaining excellent solvent retention. Compared to the case of using LLDPE-2, a smaller compression elastic modulus can be obtained, and a very flexible heat storage material can be obtained.

  Table 9 shows the gelation state when gelatin, natural fatty acid fatty acid mainly composed of stearic acid, and acrylic acid water-absorbing polymer are used as gelling agents. In Table 9, the heat storage hydrocarbon used was a mixture weight ratio of hexadecane and tetradecane of 90:10. The gelling agent was mixed at a ratio of 6% by weight with respect to the total weight. The gelation operation was carried out by heating the mixture of the heat storage hydrocarbon and the gelling agent to 140 ° C., and then rapidly charging the mixture into water at 30 ° C. after being dissolved. In the table, ◯ indicates that an elastic solid product was obtained. X shows that it does not gelatinize.

  As can be seen from Table 9, it has been found that the type of gelling agent is extremely important as a factor for obtaining an elastic solid-state gel by using the hydrocarbon for heat storage.

Measurement was performed to confirm the cold insulation of the heat storage material of the present invention. For the measurement, a hydrocarbon for thermal storage containing n-tetradecane and n-hexadecane in the following weight ratio was used.
Sample 1 ... 1: 0
Sample 2 ... 3: 1
Sample 3 ... 1: 1
Sample 4 ... 1: 3
Sample 5 ... 1: 9
Sample 6 ... 1:19
Sample 7 ... 0: 1
93.5 parts by weight of each of these hydrocarbons for heat storage and 6.5 parts by weight of polyethylene manufactured by Idemitsu Petrochemical Co., Ltd. ((LLDPE-2): trade name Moretech) are mixed and heated to 140 ° C. After being in a dissolved state, it was rapidly put into 30 ° C. water and rapidly cooled to obtain a heat storage material. All of the heat storage materials were flexible and elastic gels.

  The heat storage material obtained using Samples 1 to 7 was cut into 1 cm × 2.5 cm × 4 cm, and used as a test piece. Each test piece was held at 10 ° C. for 24 hours and then left in a room at 30 ° C. to measure the change in temperature inside the test piece. The results are shown in FIG. The reference numerals in the figure correspond to the numbers of the respective samples.

  All the test pieces showed a cooling effect. In particular, as the ratio of n-hexadecane in the heat storage hydrocarbon increases, the duration of the zone R in which the gradient of the temperature with respect to time becomes gentle and the temperature in the zone tends to increase. .

Heat storage material of the present invention is selected, hexadecane, pentadecane, and hydrocarbon consisting of one or more selected from tetradecane, linear low density polyethylene having a side chain length of C ₈ minutes, from natural oils and fats fatty acids It is made of a gel-like material mainly composed of a gelling agent, and the gel-like material includes preservatives, extenders, colorants, antioxidants, pigments, antistatic agents, antifungal agents, Auxiliaries and additives such as flame retardants, antifungal agents, heat transfer materials such as metals and carbon, and the like may be mixed.

  The heat storage material of the present invention is suitably used for cold insulation at a temperature close to room temperature. Examples of cold insulation at a temperature close to normal temperature include cold preservation of cakes, fresh fish, raw vegetables, fruits, lunch boxes, cooked rice, and the like. Moreover, the use of a heat storage material for keeping the bedding and the laying material such as cold compresses, pillows and futons at a low temperature, and a cold mat for pets. Furthermore, cold storage of chemical products, cold storage of physiological substances and biological materials, and the like can be mentioned.

  The heat storage material of the present invention is a flexible and elastic gel-like material, and even if it is compressed, the heat storage hydrocarbon does not easily bleed out, so various shapes can be used according to the shape of the object to be kept cold and the cold insulation state. And can be suitably used as a heat storage material for cold storage at a temperature close to room temperature.

  For example, in the present invention, a mixture of a heat storage hydrocarbon and a gelling agent can be melted and flowed down from a die lip and poured into a water bath to form a sheet or mat. Further, the heat storage material formed into a sheet shape or a mat shape can be further cut into a predetermined shape.

  Since the heat storage material of the present invention formed into a sheet or mat shape is soft and has excellent flexibility, it can be used by being bent and deformed according to the shape of the object to be kept cold, and In addition, since the heat storage material of the present invention hardly oozes out the hydrocarbon for heat storage even if it is compressed, it can be used in such a manner that it receives a compressive force during use.

  The heat storage material of the present invention can be used by being stored in a storage container for cold storage together with a cold storage object, and can also be used by wrapping the cold storage object in a sheet shape. In this case, since this sheet-like heat storage material is flexible and elastic, it also has a function of a cushioning material that protects the cold object from external force. Moreover, it is possible to keep the object to be kept cold without using a dedicated storage container.

  Moreover, in this invention, as shown in FIG. 5, the heat storage material 2 of this invention can be used as the heat storage material storage body 6 of the state accommodated in the storage container 4. As shown in FIG. The storage container 4 includes a storage unit body 8 that stores the heat storage material 2 and a lid unit 10 that covers the storage unit body 8. The material of the storage container 4 is not limited, but a material using a sheet-like material such as a film, a foamed resin sheet, a knitted fabric, or a nonwoven fabric is preferable, and it is preferably non-permeable. A metal layer such as aluminum may be laminated on the sheet-like material by vapor deposition or foil attachment for improving heat insulation.

  After the heat storage material 2 is cooled in advance by a cooling means such as a refrigerator, the heat storage material storage body 6 is put into use by being stored in the storage portion main body 8 and covered with the lid portion 10. The storage container 4 is preferably provided with anti-slip means 14 on the bottom surface portion 12. The non-slip means 14 is formed by attaching a non-slip material made of a material having a high friction coefficient such as an elastomer such as rubber to the bottom surface portion 12 in a dot shape or a mesh shape. Thereby, it can prevent that the thermal storage material accommodating body 6 slides and moves at the time of use. That is, the storage container 4 is preferably a heat storage material storage container 5 provided with an anti-slip means on its outer surface.

  The heat storage material of the present invention can be molded into a mat shape and used as a footrest at bedtime as the heat storage material storage body 6. Thereby, it can cool moderately, without cooling a toe excessively, and comfortable sleep can be obtained. Moreover, it shape | molds in the shape of a pillow or a pillow cover, and can be used for a pillow as the heat storage material storage body 6. FIG. Thereby, it can cool moderately, without cooling a head excessively, and comfortable sleep can be obtained.

  Furthermore, the heat storage material of the present invention can be used in the form of a cushion and laid in a baby carriage as a heat storage material storage body 6 in summer. The heat storage material of the present invention is flexible and can be used by being bent and deformed so as to conform to the infant's body. By using the heat storage material storage body 6, the infant's body can be cooled appropriately without excessive cooling, and the comfort of the baby carriage is improved. The heat storage material of the present invention can be molded into a mat shape and used as a cold mat for pets as the heat storage material storage body 6. In any of these usage modes, the presence of the anti-slip means 14 is preferable because the heat storage material storage body 6 can be prevented from sliding and moving during use.

  In another example of the usage mode of the heat storage material of the present invention, the heat storage material of the present invention is formed into a sheet having a width of about 0.5-2 mm and a handkerchief or furoshiki, and is used for beverages such as wine. The bottle can be wrapped or placed and used to keep the bottle cool. Thereby, it can cool at predetermined | prescribed appropriate temperature of the range of 5-18 degreeC, for example, 5-8 degreeC, without cooling drinks, such as wine too much, and becomes a powerful weapon in extracting the highest taste of a drink. In this case, the heat storage material of the present invention can be used by covering Sotogawa so as to be wrapped with a sheet of cloth or the like.

  When food such as rice balls is kept cold using the heat storage material of the present invention, the food can be cooled appropriately without excessive cooling, and the food can be enjoyed deliciously after being kept cold.

  By forming the heat storage material of the present invention into a plate shape and mounting it on the wall surface of the room, the effect of cooling or keeping the room indoors can be obtained for a while after the cooling and heating stop.

  In addition, the heat storage material of the present invention and the secondary molded product using the heat storage material can be used for various cooling and cooling systems by utilizing the endothermic action of external heat when the cooled and solidified material melts. Further, it can be used in a system for keeping warm and preventing freezing by utilizing a heat radiation action when the liquid material is solidified by releasing heat to the outside.

  Mixing 92 parts by weight of 97% pure n-tetradecane (main impurities: tridecane, pentadecane, the same shall apply hereinafter) and 8 parts by weight of polyethylene ((LLDPE-2): trade name Moretech) manufactured by Idemitsu Petrochemical Co., Ltd. Then, the temperature was raised to 140 ° C., and after being in a dissolved state, it was rapidly poured into 30 ° C. water and rapidly cooled to obtain a heat storage material. This heat storage material was a flexible and elastic gel.

  94 parts by weight of a hydrocarbon for thermal storage in which n-tetradecane with a purity of 97% and n-hexadecane with a purity of 98% are mixed at a weight ratio of 1: 9, and 6 parts by weight of a natural fat-and-fatty acid fatty acid mainly composed of stearic acid After mixing, the temperature was raised to 80 ° C., and after being in a dissolved state, it was rapidly put into 30 ° C. water and rapidly cooled to obtain a heat storage material. This heat storage material was a more flexible and elastic gel-like material than that obtained in Example 1.

  This heat storage material had a sharp absorption peak of heat of fusion at 16.8 ° C. as seen in the DSC curve shown in FIG.

  88 parts by weight of a hydrocarbon for heat storage in which n-tetradecane having a purity of 97% and n-hexadecane having a purity of 98% are mixed at a weight ratio of 1: 9, and 12 parts by weight of a natural fat-and-fatty acid fatty acid mainly composed of stearic acid After mixing, the temperature was raised to 80 ° C., and after being in a dissolved state, it was rapidly put into 30 ° C. water and rapidly cooled to obtain a heat storage material. This heat storage material was a more flexible and elastic gel-like material than that obtained in Example 1.

  This heat storage material had a sharp absorption peak of heat of fusion at 16.2 ° C. as seen in the DSC curve shown in FIG.

  88 parts by weight of a hydrocarbon for heat storage in which n-tetradecane having a purity of 97% and n-hexadecane having a purity of 98% are mixed at a weight ratio of 1: 9, and 12 parts by weight of a natural fat-and-fatty acid fatty acid mainly composed of stearic acid After mixing, the temperature was raised to 80 ° C., and after being in a dissolved state, it was rapidly put into 30 ° C. water and rapidly cooled to obtain a heat storage material having a size of about 10 cm × 15 cm × 1 cm. This heat storage material was a flexible and elastic gel.

  As shown in FIG. 6, this heat storage material was stored in the storage container 4a as the heat storage material 2a. The storage container 4a includes a storage body 8a and a lid 10a. Both the storage container 4a and the lid 10a are made of a thick fabric. The heat storage material 2a was first cooled to about 4 ° C. in a refrigerator for 24 hours, taken out, and stored in the storage container 4a. Temperature sensors were respectively installed on the side of the lid portion 10a (A) and the surface B of the heat storage material 2a, and the temperature change was measured with a temperature measuring instrument. The outside air temperature was about 30 ° C.

  As a control example, a conventional commercially available regenerator material made of a gel-like material mainly composed of carboxymethyl cellulose having a size of about 10 cm × 20 cm × 1 cm is stored in the storage container 4a by the same operation, and the temperature of the same part is set. The change with time was measured.

  The measurement results are shown in the graph of FIG. In FIG. 7, the vertical axis represents temperature (° C.), and the horizontal axis represents elapsed time from immediately before storing the heat storage material (or cold storage material) in the storage container. The symbols HA, H-B, C-A, C-B, and G are the A position in the heat storage material of the present invention, the B position in the heat storage material of the present invention, the A position in the control example, and the B in the control example, respectively. The position and the temperature curve of the outside air are shown.

  It can be seen that the heat storage material of the present invention keeps the inside and outside of the storage container 4a at a substantially constant temperature for a long time. The inside of the storage container 4a is maintained at a temperature of about 16 to 17 ° C. for about 6 hours. On the other hand, in the cold insulation using the conventional cold storage material, the inside of the storage container 4a is initially at an excessively low temperature of 5 ° C. or lower, and the temperature gradually rises, and after about 4 hours, 20 ° C. or higher. Then, the temperature rises and reaches about 27 ° C. about 8 hours after the start of measurement. Thus, it has been found that the heat storage material of the present invention can perform cold insulation at a substantially constant temperature close to room temperature for a long time.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

It is a graph which shows the relationship between the mixing ratio of the hexadecane and tetradecane in the heat storage material of this invention, and the peak of the heat of fusion of a gel-like material. It is a graph which shows the change of the temperature inside the test piece of the thermal storage material of this invention. It is a DSC curve of the heat storage material of the present invention. It is a DSC curve of the other heat storage material of this invention. It is side surface explanatory drawing which shows an example of the structure of the thermal storage material accommodating body of the state which accommodated the thermal storage material of this invention in the storage container. It is side surface explanatory drawing which shows the position of the temperature sensor which measures the cold storage state of the thermal storage material storage body by the thermal storage material of this invention. It is a time-dependent change graph of the temperature which shows the cold storage state of the thermal storage material storage body by the thermal storage material of this invention.

Explanation of symbols

2: Thermal storage material 4: Storage container 5: Thermal storage material container 6: Thermal storage material 14: Non-slip means

Claims (5)

One or more hydrocarbons selected from hexadecane, pentadecane, and tetradecane;
A linear low-density polyethylene having a side chain with a length of C ₈ minutes, a gelling agent containing a gelling agent selected from natural fats and fatty acids and containing no water,
The ratio of the gelling agent to the total amount of the hydrocarbon and the gelling agent is 6 to 30% by weight,
A heat storage material having a compression modulus of 10 to 1600 MPa. Heat storage material according to claim 1 wherein the gelling agent is a linear low density polyethylene having a side chain length of C ₈ minutes. The heat storage material according to claim 1 or 2, wherein a ratio of the gelling agent to a total amount of the hydrocarbon and the gelling agent is 6 to 16% by weight. One or more hydrocarbons selected from hexadecane, pentadecane, and tetradecane;
C The main component is a linear low-density polyethylene having a side chain with a length of ₈ minutes and a gelling agent selected from natural oil-based fatty acids, and does not contain water, and includes the hydrocarbon and the gelling agent. The manufacturing method of the thermal storage material which cools the mixture of a molten state whose ratio of the said gelatinizer with respect to the total amount is 6-30 weight%. A heat storage material container comprising the heat storage material according to claim 1 and a storage container for storing the heat storage material, wherein the heat storage material is stored in the storage container.

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