JPH05252850A - Thermally insulated water tank - Google Patents

Abstract

PURPOSE:To provide the subject heat storage-type water tank capable of controlling temperatures with low electric power consumption through a heat storage material preservable without causing outflow even if the heat storage component gets liquid. CONSTITUTION:The objective thermally insulated water tank is provided, at least at its bottom, with a heat storage shape 4 consisting of a solid mixture comprising a heat storage component 20-50 deg.C in melting point and an organic polymer. With the above-mentioned shape high in heat storage level, this water tank can maintain for a long time water temperature suitable for raising fishes, etc., and is excellent in thermal insulation efficiency. Also, the shape is highly preservative for the heat storage component, thus having thermal insulating effect, based on its heat storage type, even in the case of emergency or power failure and enabling its repeated use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage type warm water tank suitable for breeding tropical fish and cultured fish.

[0002]

2. Description of the Related Art Generally, fish inhabiting tropical or temperate regions consume less feed when the water temperature decreases, so that water temperature is controlled in an aquarium when raising tropical fish or cultured fish. Conventionally, as a water temperature control in such a water tank, a water tank having a heater has been known. However, there is a problem that the amount of energy such as electric power is large.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a heat storage type heat-retaining water tank capable of controlling the water temperature with a small amount of electric power consumption through a heat storage material that holds the heat storage component in a liquid state without flowing out. Development is an issue.

[0004]

The present invention has a melting point of 20 to
A heat-retaining water tank comprising a heat-retaining shape-retaining body composed of a solid mixture of a heat-retaining component at 50 ° C. and an organic polymer, arranged at least at the bottom.

[0005]

By using a heat storage component having a melting point of 20 to 50 ° C., a water temperature environment suitable for breeding tropical fish or cultured fish can be formed, and the heat storage component is mixed with an organic polymer to form an organic heat storage component. Even if it is used about 3 to 20 times as high as the polymer,
Even when the heat storage component is in a liquid state, it is possible to obtain a heat storage shape retainer that prevents outflow and retains a good amount of heat, and by using it, a heat storage type heat retention water tank can be easily obtained. In addition, by disposing the heat storage shape retainer at the bottom of the aquarium, it is possible to maintain efficient circulation of hot water through convection and transparency that does not hinder the viewing of tropical fish and the like.

[0006]

EXAMPLE A heat-retaining water tank of the present invention has a heat-retaining shape-retaining body arranged at least at the bottom. An example thereof is shown in FIG. 1, 2 and 3 are side walls of a water tank made of a transparent plate such as glass, 4 is a heat storage shape retainer, 5 is a heater, and 6 is a heat insulating material.

The heat storage shape retainer comprises a solid mixture of a heat storage component having a melting point of 20 to 50 ° C. and an organic polymer. As the heat storage component, an appropriate one that cools and solidifies (solidifies) and melts in a target temperature range of 20 to 50 ° C., especially 20 to 30 ° C. can be used, and the amount of heat storage (solidification heat) is large. Those are preferably used. The solidification heat of the heat storage component, that is, the heat release of the heat storage when the liquid state is changed to the solid state is used to raise or maintain the water temperature. Note that the heat of fusion, that is, the endothermic action by heat storage when changing from a solid state to a liquid state, can be used to suppress an excessive rise in water temperature,
Therefore, according to the present invention, a constant temperature water tank can be formed.

[0008] Examples of heat storage components generally used include paraffins, olefins, waxes, higher alcohols and fatty acids. Above all, JIS K 7
An organic compound having a melting temperature of 20 to 50 ° C., particularly 20 to 30 ° C., measured in accordance with 121 (Plastic transition temperature measuring method) is preferably used.

Specific examples of heat storage components that can be preferably used include n-paraffins having 16 to 22 carbon atoms and 1 carbon atom.
Examples thereof include n-α-olefins having 8 to 24, paraffin wax having a melting point of 115 ° F. or less, and those containing a higher alcohol having 12 to 14 carbon atoms as a main component. As the heat storage component, one type (single) or two or more types (mixture) can be used.

As the organic polymer mixed with the heat storage component,
Any suitable material that maintains a solid state in the operating temperature range can be used, and one having rubber-like properties is preferable. Above all,
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
Hydrocarbon-based polymers of up to 5% by weight, especially up to 5% by weight are preferably used. Hydrocarbon-based polymers such as olefin-based polymers, thermoplastic elastomers, and hydrocarbon-based rubbers are particularly preferable.

The organic polymer may be used alone or in combination of two or more, and may be a crosslinked product. The crosslinking can be carried out by an appropriate method such as a chemical crosslinking method using an added crosslinking agent, a water crosslinking method using a silane graft, an irradiation crosslinking method, or the like, at an appropriate stage during mixing or after mixing. The degree of cross-linking is 1% by weight or more, and especially 2% by weight or more in terms of gel fraction (JIS C 3005) based on the mixture with the heat storage component from the viewpoints of preventing outflow of the heat storage component in a liquid state and maintaining shape. preferable.

Specific examples of the olefin-based polymer include homopolymers of α-olefins such as polymethylene, polyethylene and polypropylene, copolymers of olefins with each other, α-olefin and vinyl acetate, ethyl acrylate and other types such as ethyl methacrylate. Examples thereof include copolymers with monomers and their lightly halogenated polymers, and the crystallinity thereof is not particularly limited.

Specific examples of the above-mentioned thermoplastic elastomer include any of known substances such as styrene type, olefin type, urethane type and ester type. For example, from the water temperature to 10 ° C. higher than the freezing point of the heat storage component used together, Especially 20
A material having rubber elasticity at least in a use temperature range such as a temperature range higher by ℃ is 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 and ethylene / ethyl acrylate rubber. can give.

The heat storage component and the organic polymer are mixed by mechanical means such as stirring treatment, mixing treatment, kneading treatment and the like from the viewpoint of stability of the mixed state. According to the mixing method by mechanical means, it is 300 to 2000 per 100 parts by weight of the organic polymer.
Even if a large amount of the heat storage component is mixed in a part by weight, a solid mixture which is excellent in moldability and which does not easily transfer (bleed) the heat storage component and which is not sticky can be easily obtained. The amount of heat storage component used per 100 parts by weight of organic polymer is 300.
If the amount is less than parts by weight, the resulting mixture may lack heat storage due to insufficient content of the heat storage component, and if the amount exceeds 2000 parts by weight, the mixture may have poor flexibility and the heat storage component may easily flow out.

The mixing by mechanical means is, for example, a method in which one is made into a melt (for example, a heat storage component heated and held at 100 to 200 ° C.) and the other (organic polymer) that swells or dissolves is added and stirred and mixed, It may be carried out by an appropriate method such as a method of heating both and kneading them in a fluid state or a molten state, or mixing with stirring, for example, a method of kneading with a kneader heated to 50 to 250 ° C.

For kneading, a conventional kneading machine such as a two-roll mill, a Banbury mixer, an extruder or a twin-screw kneading extruder can be used. It is preferable that the mixed state is as uniform as possible, but in general, the mixed state is such that it can be judged visually that the mixed state is uniform for 1 to 150 minutes.

The obtained solid mixture is a powder such as pellets or granules, as well as a pouring method, a pressing method,
With an appropriate method such as an extrusion molding method or an injection molding method, a string,
It can be processed into an arbitrary form such as a rod, a pipe, a sheet, and a plate, and put into practical use.

Therefore, the heat storage shape retainer in the form of a string, a rod, a pipe, a sheet, a plate or the like is preferably used for the arrangement at the bottom of the water tank. Further, rods, pipes and the like can be used as a frame body of an aquarium. Further, in the case of an ornamental water tank for tropical fish or the like, it can be arranged as a heat storage shape retainer molded into a decorative form such as an island arranged in the water tank. On the other hand, when the side wall of a water tank such as a water tank for aquaculture may be opaque, a heat storage shape retainer having an appropriate shape such as a plate may be arranged on the side wall as necessary.

The solid mixture or heat-retaining shape-retaining material may be foamed with a gas or a foaming agent, reduced in specific gravity by adding a balloon such as shirasu balloon, or an inorganic high-density filler such as metal or ceramic. It is also possible to adjust the density by increasing the specific gravity by adding It is also possible to adopt a reinforced form by filling organic fibers or inorganic fibers.

In addition, various additives, antiaging agents, antioxidants, colorants, pigments, antistatic agents, antifungal agents, flame retardants, rodent agents, and metals are added to the solid mixture or the heat storage shape retainer. An appropriate compounding agent such as a heat transfer material such as carbon or carbon can be added for practical use. It is also possible to use a heat storage shape retainer in which a soaking layer made of a heat transfer material such as metal is added by a coating method or the like.

In the case of a small-sized water tank, the heat-storing shape retainer in the heat-retaining water tank of the present invention can be arranged as a support member for storing water such as a bottom plate or a wall plate. Is placed on the bottom or side wall with the support. At that time, a method in which the solid mixture is melt-mixed and the mixture is developed into layers like cement construction can be adopted.

When arranging the heat storage shape retainer, particularly when arranging it on the bottom or side wall, a heater or a heat insulating material is attached as necessary. The heater is for heating the heat storage component in the heat storage shape retention body to be in a liquid state, and the heat insulating material is for increasing the heat retention efficiency. By arranging the heat storage shape retainer together with the heater at the bottom of the water tank or the like, there is an advantage that the surplus electricity at night can be used to store heat advantageously. The heat-retaining shape-retaining body can be heated by a method of immersing the shape-retaining shape retaining body in hot water, and may be performed by an appropriate means. By controlling a heater by attaching a rechargeable battery or the like, it is possible to form a heat retention system for a long time by utilizing surplus power at night.

The heat-retaining water tank of the present invention has a heat-retaining shape-retaining body and holds the water temperature at a predetermined high temperature through the heat storage thereof. As described above, this can be preferably used as a water tank for fish. It can be used for various purposes such as formation of a hot water pool or hot bath using surplus power at night.

Example 1 100 parts (parts by weight, hereinafter the same) containing n-eicosane as a main component (other main contents: n-octadecane, docosane, measured by gas chromatography, the same hereinafter) and thermoplastic elastomer (Shell Chemical Co., Ltd., Kraton G1
650, the same hereinafter) and 10 parts of polyethylene A (density 0.935 g / cm ³ , MI 2 g / 10 min) under heating and melting, and an antioxidant (2,2,4-trimethyl-1,
A polymer mixture of 2-dihydroquinoline (the same applies hereinafter) was mixed with 0.2 part by stirring to obtain a solid mixture. Next, the solid mixture is extruded to form a plate (heat storage shape retainer) having a thickness of 10 mm, which is then put into a glass water tank (H12 cm × W22).
cm × L30 cm) to obtain a heat-retaining water tank.

Example 2 100 parts of 98% pure n-octadecane (other main content: n-hexadecane, the same applies hereinafter), 15 parts of thermoplastic elastomer, and polyethylene B (density 0.925 g / cm 3)
³ , MI 10 g / 10 min, the same hereinafter) 10 parts under heating and melting together with 0.2 parts of an antioxidant with stirring to obtain a solid mixture, which is used in accordance with Example 1 in accordance with Example 1 I got an aquarium.

Example 3 85 parts of n-octadecane having a purity of 98% and n-hexadecane having a purity of 98% (other main components: n-tetradecane)
15 parts, thermoplastic elastomer 15 parts, and polyethylene B 10 parts were stirred and mixed with 0.2 parts of antioxidant under heating and melting to obtain a solid mixture, which was used in accordance with Example 1 for a heat storage shape retainer. And got a warm water tank.

Example 4 100 parts of n-eicosene-1 (other main contents: octadecene-1, docosene-1, hereinafter the same) having a purity of 86%,
15 parts of a thermoplastic elastomer and 10 parts of polyethylene B are mixed under heating with 0.2 part of an antioxidant with stirring to obtain a solid mixture, which is used to prepare a heat storage shape retainer and a heat retaining water tank according to Example 1. Obtained.

Example 5: 85 parts of n-eicosene-1 having a purity of 86% and a purity of 90
% N-octadecene-1 (other main contents: hexadecene-1, eicosene-1), 15 parts of thermoplastic elastomer, and 10 parts of polyethylene B under heating and melting together with 0.2 part of antioxidant. The mixture was mixed to obtain a solid mixture, which was used to obtain a heat storage shape retention body and a heat retention water tank according to Example 1.

Example 6 100 parts of 115 ° F paraffin wax, 15 parts of thermoplastic elastomer, and 10 parts of polyethylene B were stirred and mixed with 0.2 part of an antioxidant under heating and melting to obtain a solid mixture. A heat storage shape retainer and a heat retaining water tank were obtained in the same manner as in Example 1.

Comparative Example 1 The glass water tank of Example 1 was used as it was.

Comparative Example 2 n-eicosene-1 having a purity of 86% was heated to a liquid state,
It was poured into a glass water tank to form a solidified layer with a thickness of 10 mm at the bottom to obtain a heat-retaining water tank. could not.

Evaluation Test The following characteristics were examined for the solid mixture or heat storage shape retainer obtained in the example and the heat storage component of Comparative Example 2.

Melting point Using a differential scanning calorimeter, the temperature was raised from -20 ° C to 60 ° C at a rate of 2 ° C / min, and the peak endothermic temperature was examined.

Heat storage amount Measured in accordance with JIS K7122.

Bleed property After the heat-storing shape-retaining body was allowed to stand at room temperature for 7 days, it was examined whether or not the heat-storing component oozes out.

Shape Retention A solid mixture of 1 cm square block was allowed to stand at room temperature for 7 days, and then the change in shape was examined, and those having almost the original shape were evaluated as good, and those having flow or shape change were evaluated as defective. ..

Heat retention The water tanks (heat retention) obtained in Example and Comparative Example 1 were left in a heating chamber at 60 ° C. for 8 hours and then taken out, and then 4 liters of water at 20 ° C. were added thereto, and the chamber was heated at 10 ° C. (65% R). H.) and examined the change in water temperature over time.

The above results are shown in Table 1.

[Table 1]

[0040]

INDUSTRIAL APPLICABILITY The heat-retaining water tank of the present invention has a heat-retaining shape-retaining body excellent in heat storage amount, can control the water temperature with a small amount of power consumption, and can maintain the water temperature suitable for breeding fishes for a long time. It has excellent heat retention efficiency. Further, the heat storage shape retainer is excellent in holding power of the heat storage component and prevents the heat storage component from flowing out. Furthermore, based on the heat storage system, it retains heat even during an emergency or power failure and can be used repeatedly.

[Brief description of drawings]

FIG. 1 is a sectional view of an example.

[Explanation of symbols]

 1,2,3: Side wall of water tank 4: Heat storage shape retainer 5: Heater 6: Heat insulating material

Claims (1)

[Claims] 1. A heat-retaining water tank comprising a heat-retaining shape-retaining body, which is composed of a solid mixture of a heat-retaining component having a melting point of 20 to 50 ° C. and an organic polymer, disposed at least at the bottom.