JP2779990B2 - Heat storage component and heat storage material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage component suitable for heating and the like, and a heat storage material which retains it in a solid state and has excellent handleability.

[0002]

2. Description of the Related Art There has been proposed a floor heating system in which a floor plate and the like are provided on a hot water pipe, an electric heater, and the like. However, there is a problem that a large amount of energy is required for forming hot water using gas, oil, a heat pump, or the like, or for heating using an electric heater, resulting in large energy consumption. Such a large consumption of energy is manifested as an increase in running cost.

[0003]

In view of the above, the present inventors have made intensive studies to save energy consumption and have conceived of a system utilizing the heat of solidification of a heat storage component. That is, the inventors focused on the fact that the heat storage component in the liquid state releases latent heat and solidifies while maintaining a high temperature, and conceived a method of storing heat based on the heat of solidification (latent heat). According to such a method, the heat storage component is dissolved using surplus power at night,
It becomes possible to construct a heating system by the heat radiation effect when it is cooled and solidified (solidified).

However, the heat storage component is difficult to be put to practical use as it is because it is melted to be in a liquid state. For practical use of the above method, even if the heat storage component is melted to be in a liquid state, it is a heat storage material capable of preventing outflow. It is necessary. In addition, as a result of intensive studies, the present inventors found that the room temperature due to heating or the like was 19 to 23 ° C.
It has been found that it is preferable to set the heat storage temperature of the heat storage material to 35 to 45 ° C. in order to realize such room temperature in consideration of the structure of the building and the like. However, it has been found that the above object cannot be achieved using a known heat storage component (Japanese Patent Publication No. Sho 55-116786, Japanese Patent Publication No. Sho 56-116).
-16089).

Accordingly, the present invention provides a heat storage component which is preferably used for a heat storage type heating system and the like, which does not flow out even if the heat storage component is melted to be in a liquid state, has a heat storage temperature of 35 to 45 ° C. and is excellent in heat storage. Or the development of heat storage materials.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for producing eicosane at a rate of 2 parts per 100 parts by weight of 115 ° F paraffin wax.
Heat storage component characterized by containing 0 to 150 parts by weight,
And a heat storage material comprising a solid mixture of such a heat storage component and a hydrocarbon-based organic polymer.

[0007]

[Function] By mixing a heat storage component with a hydrocarbon-based organic polymer to form a solid mixture, even if the heat storage component is melted to be in a liquid state, the solid state material is retained as a whole, and the handleability is excellent. Thus, a heat storage material that can be easily formed into various forms can be obtained. In this case, a heat storage material having a heat storage temperature of 35 to 45 ° C. and an excellent heat storage amount is used by blending 20 to 150 parts by weight of eicosan in 100 parts by weight of 115 ° F. paraffin wax, which is easily available as a heat storage component. Can be formed.

[0008]

The heat storage material of the present invention has a temperature of 115 °.
It is made of a solid material in which a heat storage component containing 20 to 150 parts by weight of eicosan per 100 parts by weight of F paraffin wax is mixed with a hydrocarbon organic polymer.

[0009] The 115 ° F paraffin wax and eicosane used in the present invention may contain impurities. Generally, those having a purity of 50% or more, preferably about 90% or more in terms of heat storage amount are used. Therefore, conventional commercial products can be used as they are.

The heat storage component contains 20 to 150 parts by weight, preferably 25 to 100 parts by weight of eicosan per 100 parts by weight of 115 ° F paraffin wax. If the amount of eicosane is out of the above range, a heat storage material having a heat storage temperature or a heat storage amount suitable for heating cannot be formed.

The heat storage component may contain higher alcohols such as caprylic alcohol, lauryl alcohol, myristyl alcohol, palmityl alcohol, cetyl alcohol and stearyl alcohol, if necessary. Higher alcohols function as regulators of heat storage temperature, heat storage amount, and the like, and the blending amount is generally equal to or less than 115 ° F. paraffin wax, but is not limited thereto. The heat storage component, ethylene-based polymer, phenol, various antioxidants such as amines, thickeners such as silica,
An appropriate additive such as a coupling agent such as silane can be blended.

The above-mentioned heat storage component is enclosed in a cover such as a bag, a pipe, or a hollow ball, packed in a bag made of an organic polymer such as polyethylene, polypropylene, or polyester, and formed into a sheet or plate in a cooling process. Form,
It can be used in an appropriate form such as a form impregnated in a porous body such as a cloth, a wall, and a plate, a form encapsulated in microcapsules, and a form mixed with an organic polymer. In this case, a soaking layer made of a heat conductive material such as a metal can be added as needed.

The heat storage material of the present invention is obtained by mixing a heat storage component with a hydrocarbon organic polymer to form a solid mixture.
In this case, a mixing method using mechanical means such as a stirring process, a mixing process, and a kneading process is preferable. According to the mixing method using mechanical means, even when a large amount of heat storage component is mixed, a mixture excellent in moldability and hard to transfer (bleed) the heat storage component and hardly sticky can be easily obtained.

Mixing by mechanical means includes, for example, a method of stirring and mixing the other, which swells or dissolves in one of the melts, and a method of kneading them in a fluid state or a melt by heating both, or stirring and mixing. And so on. For kneading, for example, a conventional mixer such as a two-roll mill, a Banbury mixer, an extruder, or a twin-screw kneading extruder can be used.

As the hydrocarbon organic polymer, the main chain is basically a hydrocarbon, and the content of other components (for example, O, N, Si, halogen, etc.) in the main chain is 10% by weight or less. Among them, those having 5% by weight or less can be preferably used. Examples include olefin-based polymers, thermoplastic elastomers, hydrocarbon-based rubbers, and the like. As the hydrocarbon-based organic polymer, one or more kinds can be used, and a crosslinked product can also be used. Also, a hydrocarbon-based wax-like polymer or the like can be used in combination.

Specific examples of the olefin-based polymer include homopolymers of α-olefins such as polymethylene, polyethylene, and polypropylene, copolymers of olefins, and α-olefins with vinyl acetate, ethyl acrylate, and ethyl methacrylate. Copolymers with monomers, their lightly halogenated polymers, and the like.

Specific examples of the thermoplastic elastomer include known ones such as styrene-based, olefin-based, urethane-based and ester-based thermoplastic elastomers, and are at least 10 ° C. higher than the freezing point of the heat storage component used together from room temperature. Those having rubber elasticity in a temperature range are preferably used.

Specific examples of the hydrocarbon rubber include natural rubber, styrene / butadiene rubber, butyl rubber, isoprene rubber, ethylene / propylene rubber, ethylene / propylene / diene rubber, ethylene / vinyl acetate rubber, ethylene / ethyl acrylate rubber and the like. can give. 1 to 20 parts by weight of hydrocarbon rubber and olefin polymer 1
A combined system of up to 20 parts by weight, particularly a cross-linked system by a chemical cross-linking method, a water cross-linking method, an irradiation cross-linking method or the like can be preferably used from the viewpoint of flexibility, shape retention, moldability, toughness and the like.

The specific gravity of the solid mixture is increased by foaming with a gas or a foaming agent, by reducing the specific gravity by adding a shirasu balloon or the like, or by increasing the specific gravity by adding an inorganic high-density filler such as metal or ceramic. Can also be adjusted. Further, the reinforcing form can be made by filling with organic fibers or inorganic fibers or using a support such as a string, a wire, a nonwoven fabric, a woven fabric, or a net. In addition, appropriate additives such as various additives, antioxidants, coloring agents, pigments, antistatic agents, fungicides, flame retardants, rodents, heat transfer materials such as metals and carbon are added to the solid mixture. For practical use.

The solid mixture may be used in the form of powder, granules or balls such as pellets, chunks such as balls, or any other suitable method such as a casting method, a pressing method, an extrusion molding method, or an injection molding method. It can be processed into an arbitrary form such as a honeycomb body, a pipe or the like and put to practical use. In addition, a method of directly spreading to an application location by a casting method of a molten material or the like can also be adopted. Therefore, the heat storage material of the present invention can be formed into an arbitrary form according to the purpose of use.

The heat storage material of the present invention can be used as a heat storage heat source for various purposes such as heating and heat retention. Examples of a method for applying to the floor heating include a method in which a pipe of hot water is formed of a heat storage material, a method in which a heat storage material formed of granules or the like is circulated in hot water, and a method in which the hot water pipe is covered with a heat storage material formed of a sheet or the like. Examples of the method include a method in which a heat storage material such as a plate, a rod, a honeycomb body, or a pipe is laid along with an appropriate heat source such as a hot water pipe or a heater below a floor finishing material.

[0022]

According to the present invention, it is possible to obtain a heat storage material that maintains a solid state by holding the heat storage component without flowing out even if the heat storage component is in a liquid state, and has excellent handleability and moldability. It can be used in various forms and is excellent in heat storage and shape retention. In addition, it has a heat storage temperature suitable for heating, and can store heat economically using surplus electric power and surplus heat at night.

[0023]

Example 1 80 parts of 115 ° F paraffin wax (parts by weight, the same applies hereinafter) and 20 parts of 98% pure eicosane (main impurities: octadecane, hexadecane, measurement by gas chromatography, the same applies hereinafter), Thermoplastic elastomer (Clayton G1650, manufactured by Shell Chemical Co., Ltd .; the same applies hereinafter) 15
And 5 parts of a hydrocarbon wax (manufactured by Mitsui Petrochemical Co., Ltd., High Wax 400P, softening point: 136 ° C .; the same applies hereinafter) while heating and melting the mixture to obtain an antioxidant (2,2,4-trimethyl-1,2). -A polymer of dihydroquinoline, the same applies hereinafter)
The mixture was stirred and mixed with 5 parts to obtain a heat storage material (solid mixture).

Example 2 The amount of 115 ° F paraffin wax used was 70 parts,
A heat storage material (solid mixture) was obtained in the same manner as in Example 1 except that the amount of eicosane having a purity of 98% was changed to 30 parts.

Example 3 The amount of 115 ° F paraffin wax used was 60 parts,
A heat storage material (solid mixture) was obtained in the same manner as in Example 1 except that the amount of eicosane having a purity of 98% was changed to 40 parts.

Example 4 The amount of 115 ° F paraffin wax used was 50 parts,
A heat storage material (solid mixture) was obtained in the same manner as in Example 1 except that the amount of eicosane having a purity of 98% was changed to 50 parts.

EXAMPLE 5 60 parts of 115 ° F. paraffin wax, 20 parts of eicosan having a purity of 98%, 20 parts of cetyl alcohol, 15 parts of a thermoplastic elastomer, and 5 parts of a hydrocarbon wax were oxidized while heating and melting. The mixture was stirred and mixed with 0.5 part of the inhibitor to obtain a heat storage material (solid mixture).

Comparative Example 1 115 ° F. paraffin wax was used as it was as a heat storage material.

Comparative Example 2 Eicosan having a purity of 98% was directly used as a heat storage material.

Evaluation Test The following characteristics were examined for the heat storage materials obtained in Examples and Comparative Examples. Heat storage temperature 0 with a differential scanning calorimeter according to JIS K 7121
The temperature was raised or lowered between 2 and 60 ° C. at a rate of 2 ° C./min, and the average of the peak temperatures at that time was determined.

Heat storage amount The total heat absorption and total heat release in the above-mentioned heat storage temperature test were examined in accordance with JIS K 7122, and the average was determined.

Shape Retention After a 1 cm square block of heat storage material was allowed to stand at 60 ° C. for 1 day, the change in shape was examined, and the material that substantially retained the original shape was evaluated as good, and the one that had flow or changed shape was evaluated as poor. .

Bleedability After the heat storage material was allowed to stand at 60 ° C. for 7 days, it was checked whether or not the heat storage component had oozed out.

Workability The mixed components for forming the heat storage material are stirred and mixed at 150 ° C., then left to stand at room temperature to solidify, cut off and examined for the dispersed state of the mixed components. did.

The results are shown in Table 1.

[Table 1]

Claims (2)

(57) [Claims] 1. A heat storage component comprising 20 to 150 parts by weight of eicosan per 100 parts by weight of 115 ° F. paraffin wax. 2. A heat storage material comprising a solid mixture of the heat storage component according to claim 1 and a hydrocarbon organic polymer.