JPH07286168A - Heat-accumulation material - Google Patents

Abstract

PURPOSE:To provide a heat-accumulation material produced by supporting an organic heat-accumulation material on a resin and exhibiting decreased bleeding of the organic heat-accumulation material. CONSTITUTION:This heat-accumulation material is produced by supporting an organic heat-accumulation material causing reversible phase transition between a solid phase and a liquid phase on a substrate containing a lowly crystalline polyolefin having a crystallinity of <40%. The organic heat-accumulation material contains 0.5-20.0wt.% of an oil component extracted in a sweating process in the refining of hydrocarbon and the substrate contains a flow point depressing agent and/or asphalt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage body utilizing latent heat associated with a phase transition.

[0002]

2. Description of the Related Art Conventionally, a heat storage material in which an organic heat storage material such as paraffin is supported on a resin is a latent heat storage material that utilizes latent heat accompanying the phase transition between the solid phase and the liquid phase of the organic heat storage material.
In such a latent heat storage material that utilizes the phase transition between the solid phase and the liquid phase, consideration must be given to prevent the organic heat storage material from flowing out of the resin when it becomes liquid due to the phase transition. . Japanese Patent Application Laid-Open No. 59-170180 proposes ultra-high molecular weight polyethylene as a resin, and Japanese Patent Application Laid-Open No. 62-187782 proposes polyolefins such as polyethylene and polypropylene. However, with the recent expansion of the use range of the heat storage body, there is a demand for a heat storage body in which the exudation of the organic heat storage material is further reduced.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and an object of the present invention is to provide a heat storage material in which an organic heat storage material is supported on a resin, which is an organic heat storage material. The object is to provide a heat storage material that reduces the amount of leakage.

[0004]

The heat storage material according to claim 1 of the present invention comprises a substrate containing a low-crystalline polyolefin having a crystallinity of less than 40% and a reversible phase between a solid phase and a liquid phase. A heat storage material carrying an organic heat storage material that is transferred, characterized in that the organic heat storage material contains 0.5 wt% to 20.0 wt% of an oil component extracted in a perspiration step of hydrocarbon refining. And

According to a second aspect of the present invention, there is provided a heat storage element according to the first aspect, wherein the oil content is an amorphous isoparaffin, an alkyl aromatic compound, a polymethacrylate compound, or a polar compound, which is amorphous and has a melting point of a crystalline hydrocarbon or less. It is characterized by being at least one selected from nitrogen compounds and sulfa compounds.

The heat storage material according to claim 3 of the present invention is an organic heat storage material that reversibly undergoes a phase transition between a solid phase and a liquid phase on a substrate containing a low crystalline polyolefin having a crystallinity of less than 40%. Is a heat storage material supporting at least one of a petroleum pour point depressant and asphalt.

According to a fourth aspect of the present invention, in the heat storage element according to the third aspect, the pour point depressant has a long chain alkyl aromatic compound, an ethylene vinyl acetate copolymer, and a long chain alkyl group. It is a compound containing at least one selected from polymethacrylate compounds as a main component.

According to a fifth aspect of the present invention, in the heat storage element according to any one of the first to fourth aspects, the substrate further comprises a crystalline polyolefin having a crystallinity of 40% or more as a constituent material. It is characterized by

According to a sixth aspect of the present invention, there is provided the heat storage element according to any one of the first to fifth aspects, wherein the organic heat storage material is crystalline hydrocarbon, crystalline fatty acid,
And at least one selected from crystalline fatty acid esters.

The present invention will be described in detail below. The heat storage material of the present invention comprises a substrate containing a low crystalline polyolefin having a crystallinity of less than 40%, and an organic heat storage material that reversibly undergoes a phase transition between a solid phase and a liquid phase.

Examples of the low crystalline polyolefin include
For example, a copolymer of ethylene and α-olefin may be mentioned, and as the α-olefin, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-
Penten, 1-octene, etc. are mentioned. Propylene is particularly preferable, but it is not limited thereto. The low crystallinity polyolefin has a crystallinity of less than 40% by X-ray diffractometry. When a low crystalline polyolefin having a crystallinity of less than 40% is used as a carrier for the organic heat storage material, the organic heat storage material is prevented from being eluted from the heat storage material. From the viewpoint of elution, the crystallinity of this low crystalline polyolefin is more preferably 30% or less, and most preferably 20% or less.

When a crystalline polyolefin having a degree of crystallinity of 40% or more is used as a resin for the substrate of the heat storage material together with the low crystalline polyolefin in order to improve the strength of the heat storage material, the shape of the heat storage material is maintained. You can increase your strength. In particular, the crystallinity of low crystalline polyolefin is 30
% Or less, it is effective. Examples of the crystalline polyolefin include ethylene-α-olefin copolymer, medium density polyethylene, and high density polyethylene. The medium-density polyethylene and the high-density polyethylene are specified in JIS-K-6760.

The above organic heat storage material is a substance having a property of reversibly undergoing a phase transition between a solid phase and a liquid phase, and is compatible with the low crystalline polyolefin having a crystallinity of less than 40%. Desirably, when a crystalline polyolefin having a crystallinity of 40% or more is used, one having compatibility with the crystalline polyolefin is desirable. The organic heat storage material is not particularly limited, but specifically, paraffin,
Examples include hydrocarbons such as paraffin wax, isoparaffin, and polyethylene wax, fatty acids, and fatty acid esters (hereinafter referred to as fatty acids). These may use only 1 type and may use 2 or more types together. When the heat medium, which is a medium for heat exchange, contains water, hydrocarbons are preferable because they deteriorate fatty acids. The organic heat storage material is preferably a crystalline substance having a heat of fusion of 20 cal / g or more from the viewpoint of maintaining heat storage efficiency.

In the heat storage body according to claim 1 of the present invention, the organic heat storage material contains 0.5 wt% to 20.0 wt% of the oil content extracted in the perspiration step of hydrocarbon refining.
It is contained in the range of. The oil content, as a step of refining hydrocarbons from crude oil, usually a desalting step,
It is carried out through a distillation process, a dewaxing process, a deoiling process, a sweating process, and hydrorefining. What is the sweating process?
This is a step of gradually heating the paraffin to extract the components other than the n-paraffin remaining between the n-paraffin crystals, and the extracted component is an oil component. Examples of the oil include, for example, non-crystalline isoparaffin, cycloparaffin, and the like which are not higher than the melting point of crystalline hydrocarbon.
Examples include alkyl aromatic compounds, polymethacrylate compounds, polar nitrogen compounds (indoles), and sulfa compounds (thiophenes).

The oil component has a molecular structure similar to that of the crystal part of the organic heat storage material but different from that of the organic heat storage material. That is, it has a long alkyl group or a methylene chain as a molecular structure similar to the crystal part of the organic heat storage material, and has a polar group or an aromatic group as a molecular structure different from the crystal part of the organic heat storage material. Therefore, the portion similar to the crystal part of the organic heat storage material is adsorbed or eutectic to the crystal of the organic heat storage material, and the structural portion different from the crystal part stops the growth of crystals in a certain direction. Therefore, the compatibility of the organic heat storage material is improved and the exudation is reduced. In particular, having a polar group in the molecular structure hinders the flow of the organic heat storage material and serves to increase the melt viscosity of the organic heat storage material, which is preferable.

The oil content is in the range of 0.5% by weight to 20.0% by weight based on the organic heat storage material. If the content is less than 0.5% by weight, the effect of reducing bleeding is reduced, and if the content exceeds 20.0% by weight, the latent heat amount of the organic heat storage material is reduced.

As a method of containing the oil component in the heat storage body, the components of the oil component may be blended together with the above-mentioned constituent materials in the production of the heat storage body, or an organic heat storage material containing the oil content in the above content in advance. May be used to contain oil. Semi-refined paraffin is mentioned as an organic heat storage material containing the oil content of the said content. This semi-purified paraffin is obtained by omitting the sweating step of the above-mentioned hydrocarbon refining step. In addition, since semi-refined paraffin is cheaper than refined paraffin, it is advantageous in terms of cost.

The ratio of the constituent materials used in the present invention is appropriately determined depending on the use of the heat storage material and is not limited.
It is suitable that the low crystalline polyolefin is 10 to 70% by weight, the organic heat storage material is 30 to 90% by weight, and the oil content is 0.5% to 20.0% by weight with respect to the organic heat storage material.

Further, when a low crystalline polyolefin and a crystalline polyolefin are used as the resin, the compounding ratio is, for example, 5 to 70 for the above low crystalline polyolefin.
% By weight, the crystalline polyolefin is 0 to 65% by weight,
30 to 90% by weight is suitable for the organic heat storage material, and oil content is 0.5 to 20.0% by weight with respect to the organic heat storage material.
Is.

Next, a heat storage body according to claim 3 of the present invention will be described. In the heat storage material of the present invention, the substrate contains at least one of a pour point depressant and asphalt. The pour point depressant, which is also called a low temperature fluidity improver, is a polymer agent that prevents the phenomenon that fuel oil or lubricating oil solidifies at low temperature and loses fluidity. Examples of the pour point depressant include compounds containing a long chain alkyl aromatic compound, an ethylene vinyl acetate copolymer, a polymethacrylate compound having a long chain alkyl group as a main component. The asphalt is obtained by distilling petroleum and is mainly used as a road paving material. These pour point depressants and asphalts have a molecular structure different from the molecular structure similar to the crystal part of the organic heat storage material in the molecular structure. That is, it has a long alkyl group or a methylene chain as a molecular structure similar to the crystal part of the organic heat storage material, and has a polar group or an aromatic group as a molecular structure different from the crystal part of the organic heat storage material. . The above-mentioned pour point depressant and asphalt may be only one type in the substrate,
You may use 2 or more types together.

The mixing ratio of the constituent materials used in the heat storage material of the present invention is appropriately determined depending on the use of the heat storage material. For example, the low crystalline polyolefin is 10 to 70% by weight, the pour point depressant and the asphalt are the total. 0.05 to 20% by weight, and 30 to 90% by weight are suitable for the organic heat storage material. However, the total amount of resin, pour point depressant and asphalt is preferably 10 to 70% by weight. If the ratio of the low crystalline polyolefin is less than the above range, or if the ratio of the pour point depressant and asphalt is more than the above range, the ability to carry the organic heat storage material decreases, which may elute,
If the ratio of the organic heat storage material is less than the above range, the heat storage amount will decrease.

Further, when a low crystalline polyolefin and a crystalline polyolefin are used as the resin, the compounding ratio is, for example, 5 to 70 for the above low crystalline polyolefin.
% By weight, the crystalline polyolefin is 0 to 65% by weight,
The total amount of pour point depressant and asphalt is 0.05 to 20% by weight, that of organic heat storage material is 30 to 90% by weight, but the total amount of resin and pour point depressant and asphalt is 10 to 70% by weight. is there. If the ratio of the low crystalline polyolefin is less than the above range, or if the ratio of the pour point depressant and asphalt exceeds the above range, the ability to carry the organic heat storage material is reduced, and there is a risk of elution, When the total amount of the resin, the pour point depressant and the asphalt exceeds the above range, the heat storage amount tends to decrease.

The organic heat storage material can be supported on the resin by, for example, kneading at a temperature equal to or higher than the melting point of the resin with a kneader and molding the molten mixture. The heat storage body can be manufactured by a usual plastic molding method such as extrusion molding or injection molding. In addition to the above-mentioned constituents, various inorganic fillers, flame retardants, antioxidants, metal fibers, glass fibers, whiskers and the like may be added to and dispersed in the heat storage body, if necessary.
Moreover, you may perform a crosslinking process to the said heat storage body as needed. Examples of the method of this crosslinking treatment include vulcanization with sulfur, peroxide crosslinking, and radiation crosslinking with γ rays or electron beams, but peroxide crosslinking or radiation crosslinking is preferable. When the cross-linking penetrates to the inside, the latent heat amount decreases, so only the surface is cross-linked to form the resin coating layer.
Radiation cross-linking with an electron beam having low transparency is more preferable.

[0024]

In the heat storage body according to claim 1 of the present invention, the organic heat storage material contains 0.5 wt% to 20.0 wt% of the oil content extracted in the perspiration step of hydrocarbon refining. As the crystal structure of the organic heat storage material has a different molecular structure from that of the crystal part, the similar part is adsorbed or eutectic to the crystal of the organic heat storage material, and the structure part different from the crystal part has a certain direction. To stop the growth of crystals. Therefore, the compatibility of the organic heat storage material is improved and the exudation is reduced.

The heat storage material according to claim 3 of the present invention has at least one of a petroleum pour point depressant and asphalt as a substrate.
Since it contains more than one species, the pour point depressant and asphalt have a molecular structure similar to the crystal part of the organic heat storage material and a different molecular structure in this molecular structure. It is adsorbed or eutectic on the crystal of the heat storage material, the compatibility of the organic heat storage material is improved, and the exudation is reduced.

[0026]

EXAMPLES Examples of the present invention and comparative examples will be described below. Table 1 shows the types and characteristics of low-crystalline polyolefin resins having a crystallinity of less than 40% used in Examples and Comparative Examples, and the types and characteristics of crystalline polyolefin resins having a crystallinity of 40% or more. Is shown in Table 2. The characteristics include crystallinity by X-ray diffractometry, density, and melt florate (MF
R). The characteristics of the organic heat storage material are shown in Table 3. The oil content in the table is a value measured based on JIS-K-2235. Types of pour point depressants and asphalts are shown in Table 4.

[0027]

[Table 1]

[0028]

[Table 2]

[0029]

[Table 3]

[0030]

[Table 4]

Example 1 20 parts by weight of an ethylene-propylene copolymer (10% crystallinity, 0.7 melt melt resin: resin A) as a low crystalline polyolefin having a crystallinity of less than 40% (the following parts) 10 parts of high-density polyethylene (crystallinity 63%: resin E) as the crystalline polyolefin, and 70 parts of semi-refined paraffin soft paraffin No. 1 (oil content 2.0%) as the organic heat storage material. A molding material was prepared by mixing in a mixing ratio. This molding material was fed to a twin-screw kneading extruder,
The kneaded melt was cooled while being heated to 140 ° C. and cut to prepare a rectangular parallelepiped heat storage body having a thickness of 15 mm and a length of 50 mm.

Example 2 In the same manner as in Example 1 except that the resin A of Example 1 was replaced by an ethylene-propylene copolymer (crystallinity 10%, melt florate 0.4: resin B). A heat storage body was produced.

Example 3 Instead of the soft paraffin No. 1 of Example 2, semi-refined paraffin soft paraffin No. 2 (oil content 1.6%)
A heat storage body was produced in the same manner as in Example 2 except that was used.

Comparative Example 1 A heat storage material was prepared in the same manner as in Example 1 except that refined paraffin 125 (oil content 0.4%) was used in place of the soft paraffin No. 1 of Example 1.

Comparative Example 2 A heat storage material was prepared in the same manner as in Example 2 except that refined paraffin paraffin 125 (oil content 0.4%) was used in place of the soft paraffin No. 1 of Example 2.

Comparative Example 3 A heat storage material was prepared in the same manner as in Example 3 except that refined paraffin paraffin 135 (oil content 0.2%) was used in place of the soft paraffin No. 2 of Example 3.

[0037]

[Table 5]

The obtained Examples 1 to 3 and Comparative Examples 1 to 3
The exudation of the heat storage body of was evaluated. The exudation was obtained as follows. A 200-cycle cold heat test was conducted in the atmosphere of the temperature condition shown in FIG. After the test, the heat storage material was taken out, the organic heat storage material exuding around the heat storage material was wiped off at 70 ° C., and the melt release rate was calculated from the reduced weight. Melt release rate (%) = (weight reduction amount of heat storage material / weight of initial organic heat storage material) × 100 As shown in Table 6, in Examples 1 to 3, the melt release rate is a comparative example. It was less than 1-3.

[0039]

[Table 6]

Example 4 13.3 parts of an ethylene-propylene copolymer (10% crystallinity, melt florate 0.4: resin B) as a low crystallinity polyolefin having a crystallinity of less than 40%, crystallinity High density polyethylene (Crystallinity 63
%: Resin E) 6.7 parts, semi-refined paraffin soft paraffin No. 2 (oil content 1.6 as an organic heat storage material)
%) At a compounding ratio of 80 parts to obtain a molding material. This molding material was fed to a twin-screw kneading extruder, and the kneaded melt was cooled while being heated to 140 ° C. and cut to have a thickness of 15
A rectangular parallelepiped heat storage body having a size of 50 mm and a length of 50 mm was produced.

Comparative Example 4 A heat storage material was produced in the same manner as in Example 4 except that paraffin 125 (oil content 0.4%) of purified paraffin was used instead of soft paraffin No. 2 of Example 4.

[0042]

[Table 7]

The exudation of the obtained heat storage bodies of Example 4 and Comparative Example 4 was evaluated under the same conditions as in Example 1. The results are shown in Table 8.
As shown in, the melt-off rate of Example 4 was 0.60%, which was smaller than that of Comparative Example 4.

[0044]

[Table 8]

Example 5 10 parts of linear low-density polyethylene (30% crystallinity: resin D) as a low-crystalline polyolefin having a crystallinity of less than 40% and linear low-density polyethylene (crystallized as a crystalline polyolefin) 41%: Resin G) and 10 parts of soft paraffin No. 3 (oil content 6.0%) of semi-refined paraffin as an organic heat storage material at a mixing ratio of 80 parts to obtain a molding material. This molding material was supplied to a twin-screw kneading extruder, and the kneaded melt was cooled while being heated to 140 ° C. and cut to prepare a rectangular parallelepiped heat storage body having a thickness of 15 mm and a length of 50 mm.

Comparative Example 5 A heat storage material was prepared in the same manner as in Example 5 except that refined paraffin paraffin 140 (oil content 0.3%) was used in place of the soft paraffin No. 3 of Example 5.

[0047]

[Table 9]

The exudation of the obtained heat storage bodies of Example 5 and Comparative Example 5 was evaluated under the same conditions as in Example 1. The results are shown in Table 1.
As shown in 0, the melt release rate of Example 5 was 1.52%, which was smaller than that of Comparative Example 5.

[0049]

[Table 10]

Example 6 19 parts of ethylene-propylene copolymer (10% crystallinity, 0.7 melt melt resin: resin A) as a low-crystalline polyolefin having a crystallinity of less than 40%, asphalt (Nippon Oil Co., Ltd.) Co., Ltd .: 10-20 SP blown) 1
Parts, 10 parts of high-density polyethylene (crystallinity 77%: resin F) as the crystalline polyolefin, and paraffin 125 as the organic heat storage material at a mixing ratio of 70 parts to obtain a molding material. This molding material is supplied to a twin-screw kneading extruder, and the kneaded melt is cooled while being heated to 140 ° C.,
After cutting, a rectangular parallelepiped heat storage body having a thickness of 15 mm and a length of 50 mm was produced.

Comparative Example 6 20 parts of ethylene-propylene copolymer (10% crystallinity, 0.7 melt melt resin: resin A) as a low crystalline polyolefin having a crystallinity of less than 40%, and a crystalline polyolefin High density polyethylene (77% crystallinity:
Resin F) 10 parts, paraffin 12 as an organic heat storage material
5 was compounded at a compounding ratio of 70 parts to obtain a molding material. Thereafter, a heat storage body was produced in the same manner as in Example 6.

[0052]

[Table 11]

The exudation of the obtained heat storage bodies of Example 6 and Comparative Example 6 was evaluated. 1 in the atmosphere of the temperature conditions shown in FIG.
Evaluation was carried out under the same conditions as in Example 1 except that a 00 cycle cold heat test was performed. As shown in Table 10, the melt release rate of Example 6 was 0.34%, which was smaller than that of Comparative Example 1.

[0054]

[Table 12]

Example 7 Ethylene-butene copolymer as a low-crystalline polyolefin having a crystallinity of less than 40% (crystallinity 25%: resin C)
29 parts, asphalt (manufactured by Nippon Oil Co., Ltd .: 10-
1 part of 20 SP blown) and 70 parts of paraffin 125 as an organic heat storage material were mixed to obtain a molding material. This molding material was fed to a twin-screw kneading extruder,
The kneaded melt was cooled while being heated to ° C and cut to produce a rectangular parallelepiped heat storage body having a thickness of 15 mm and a length of 50 mm.

Comparative Example 7 As a low-crystalline polyolefin having a crystallinity of less than 40%, an ethylene-butene copolymer F15 (crystallinity of 25%:
Resin C) 30 parts, paraffin 12 as an organic heat storage material
5 was compounded at a compounding ratio of 70 parts to obtain a molding material. Hereinafter, a heat storage body was produced in the same manner as in Example 7.

[0057]

[Table 13]

The exudation of the obtained heat storage bodies of Example 7 and Comparative Example 7 was evaluated under the same conditions as in Example 6. The results are shown in Table 1.
As shown in FIG. 4, the melt release rate of Example 7 was 0.74%, which was smaller than that of Comparative Example 7.

[0059]

[Table 14]

Example 8 10 parts of an ethylene-propylene copolymer (10% crystallinity, 0.7 melt melt resin: resin A) as a low crystalline polyolefin having a crystallinity of less than 40% and asphalt (Nippon Oil Co., Ltd.) Co., Ltd .: 10-20 SP blown) 1
Parts, 11 parts of high-density polyethylene (crystallinity 77%: resin F) as the crystalline polyolefin, and paraffin 140 as the organic heat storage material at a mixing ratio of 78 parts to obtain a molding material. This molding material is supplied to a twin-screw kneading extruder, and the kneaded melt is cooled while being heated to 140 ° C.,
After cutting, a rectangular parallelepiped heat storage body having a thickness of 15 mm and a length of 50 mm was produced.

Example 9 The same procedure as in Example 8 was repeated except that a polymethacrylate compound having a long-chain alkyl group (Sanyo Kasei Co., Ltd .: Acluve 138) was used as a pour point depressant instead of the asphalt of Example 8. The heat storage body was produced.

Example 10 10 parts of an ethylene-propylene copolymer (10% crystallinity, 0.7 melt melt resin: resin A) as a low crystalline polyolefin having a crystallinity of less than 40% and asphalt (Nippon Oil Co., Ltd.) Co., Ltd .: 10-20 SP blown) 1
A molding material was prepared by blending 0 part, high-density polyethylene (crystallinity 77%: resin F) as a crystalline polyolefin at 10 parts, and paraffin 140 as an organic heat storage material at a mixing ratio of 70 parts. Thereafter, a heat storage body was produced in the same manner as in Example 8.

Comparative Example 8 11 parts of an ethylene-propylene copolymer (10% crystallinity, 0.7 melt melt resin: resin A) as a low crystalline polyolefin having a crystallinity of less than 40% and a crystalline polyolefin High density polyethylene (77% crystallinity:
Resin F) 11 parts, paraffin 14 as an organic heat storage material
0 was compounded at a compounding ratio of 78 parts to obtain a molding material. Thereafter, a heat storage body was produced in the same manner as in Example 8.

[0064]

[Table 15]

The obtained Examples 8 to 10 and Comparative Example 8
The exudation of the heat storage body of was evaluated. For exudation, a 100-cycle cold heat test was performed in an atmosphere under the temperature conditions shown in FIG. After the test, the heat storage body was taken out, the organic heat storage material exuding around the heat storage body was wiped off at 80 ° C., and the melt release rate was calculated from the reduced weight. The results are shown in Table 16,
The melt release rate of the example was smaller than that of the comparative example 8.

[0066]

[Table 16]

[0067]

According to the heat storage material of claim 1 of the present invention, when the organic heat storage material contains 0.5 wt% to 20.0 wt% of the oil extracted in the perspiration step of hydrocarbon refining, The exudation of the organic heat storage material can be reduced.

According to the heat storage material of claim 3 of the present invention,
A heat storage material in which a resin supports an organic heat storage material, and if at least one of a pour point depressant and asphalt is contained, the exudation of the organic heat storage material can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of conditions of a cold heat test of Examples 1 to 7 and Comparative Examples 1 to 7.

FIG. 2 is an explanatory diagram of conditions of a cold heat test of Examples 8 to 10 and Comparative Example 8.

[Explanation of symbols]

 None

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Kiyozo 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Koichi Takahama, 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. 72) Inventor Kenji Tsubaki Matsuda Electric Works Co., Ltd. 1048 Kadoma, Kadoma City, Osaka Prefecture

Claims (6)

[Claims] 1. A heat storage material comprising a substrate containing a low crystalline polyolefin having a crystallinity of less than 40% and an organic heat storage material that reversibly undergoes a phase transition between a solid phase and a liquid phase, the heat storage material comprising: A heat storage body, characterized in that the organic heat storage material contains 0.5 wt% to 20.0 wt% of an oil component extracted in a sweating step of hydrocarbon refining. 2. An isoparaffin, a cycloparaffin, which is amorphous and has an oil content below the melting point of the crystalline hydrocarbon,
The heat storage body according to claim 1, which is at least one selected from an alkyl aromatic compound, a polymethacrylate compound, a polar nitrogen compound, and a sulfa compound. 3. A heat storage material comprising a substrate containing a low-crystalline polyolefin having a crystallinity of less than 40% and an organic heat storage material that reversibly undergoes a phase transition between a solid phase and a liquid phase, the heat storage material comprising: A heat storage material comprising a substrate containing at least one or more of a petroleum pour point depressant and asphalt. 4. The compound having at least one selected from a long-chain alkyl aromatic compound, an ethylene vinyl acetate copolymer, and a polymethacrylate compound having a long-chain alkyl group as a main component, the pour point depressant. The heat storage body according to claim 3, wherein: 5. The heat storage body according to claim 1, wherein the substrate further comprises a crystalline polyolefin having a crystallinity of 40% or more as a constituent material. 6. The organic heat storage material is at least one selected from crystalline hydrocarbons, crystalline fatty acids, and crystalline fatty acid esters.
The heat storage body according to claim 5.