JPH0688627A - Heat srtorage board and floor heating structure using it - Google Patents

Abstract

PURPOSE:To absorb a volume change caused by thermal expansion and contraction by forming a concave portion in at least one surface of a board composed of a heat storage shape-keeping structure yielded by mixing with mechanical means a specific part by weight of paraffines and a specific part by weight of hydrocarbon organic high polymer. CONSTITUTION:A heat storage board is yielded by molding a heat storage material yielded by mincing with mechanical means paraffines and a binder component comprising hydrocarbon organic high polymer of 5-30 parts by weight per 100 parts by weight of the paraffines. A concrete example of the paraffines includes varieties of paraffines, wax, and for the hydrocarbon organic high polymer includes those having a main chain of hydrocarbon with contents of other components in the main chain to be 10% by weight or lower. Since there is formed the concave portion 2 in the one surface of the heat storage board T, there is absorbed in the concave portion 2 the volume change of the heat storage board T caused by thermal expansion anti contraction of the heat storage material 1 as it stores heat or radiates heat. Thus, the heat storage board is prevented in itself from being damaged, and any crack or distortion is prevented from being produced in a mortar disposed on the board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage board, and more particularly, to a heat storage board having shape retention even during heat storage and a floor heating structure using the heat storage board.

[0002]

2. Description of the Related Art In recent years, a floor heating system has been widely adopted for heating a room. In order to improve the thermal efficiency of this floor heating system, the present inventors have proposed a heat storage shape retainer obtained by mixing 100 parts by weight of paraffins and 5 to 30 parts by weight of a hydrocarbon organic polymer by mechanical means. We found that they can be used in combination and have already applied for a patent (Japanese Patent Application No. 3-18).
5180). The heat storage shape retainer is not liquefied even when heat is stored, has shape retention at all times, and is easy to handle, so it is an excellent heat storage material.By using this, the thermal efficiency of the floor heating system is improved. It has become possible to improve. In such a floor heating structure, for example, as shown in FIG. 6, a heat storage board T made of the heat storage material, a heating element 13, and a mortar layer 14 are arranged on a concrete floor 11 in which a heat insulating material 12 is embedded. The floor material 16 is laid on this surface.

[0003]

However, in the heat storage board T, the heat storage material causes thermal expansion / contraction during heat storage / heat dissipation to cause a volume change, and the heat storage board itself is damaged by the repetition of the heat storage board or above the heat storage board. Mortar layer 1 provided
4 and the floor material 16 are distorted or cracked, and the durability of the floor heating structure is deteriorated.

An object of the present invention is to solve the above problems and provide a heat storage board suitable for floor heating which can absorb a volume change due to thermal expansion and contraction of a heat storage material, and a floor heating structure using this board. is there.

[0005]

Means for Solving the Problems The present inventors have paid attention to the shape of the heat storage board and studied the shape capable of absorbing the volume change of the heat storage board. The present invention has been completed by finding that the above object can be achieved by forming a concave portion having a specific volume ratio. That is, the heat storage board of the present invention comprises 100 parts by weight of paraffins and 5 to 30 parts by weight of a hydrocarbon organic polymer mixed by mechanical means on at least one side of a heat storage board comprising a heat storage shape retainer. A heat storage board having a recess formed therein, preferably the recess is formed at a volume ratio corresponding to 2 to 30% of the volume of the entire heat storage board. Further, the floor heating structure of the present invention has at least a lower surface portion of a board made of a heat storage shape retainer obtained by mixing 100 parts by weight of paraffins and 5 to 30 parts by weight of a hydrocarbon organic polymer by mechanical means. A floor heating structure in which a heat storage board having a concave portion is laid under a floor material so that its upper surface faces the floor material,
Preferably, a heating element is laid on the upper surface of the heat storage board.

The present invention will be described in more detail below. Figure 1
FIG. 4 is a perspective view of a heat storage board showing an embodiment of the present invention. T is a heat storage board, 1 is a heat storage material, and 2 is a recess.

The heat storage board is formed of a heat storage material obtained by mixing paraffins and 5 to 30 parts by weight of a binder component consisting of a hydrocarbon organic polymer per 100 parts by weight of the paraffins by mechanical means. Obtained.

As the above-mentioned paraffins, JIS K
An organic compound whose T _max measured according to 7121 (Plastic transition temperature measuring method) is in the working temperature, that is, in the temperature range of 20 to 80 ° C., preferably 30 to 60 ° C. is used. Preferable specific examples of paraffins include various paraffins, waxes, waxes, stearic acid,
Examples thereof include fatty acids such as palmitic acid, polyethylene glycol and the like, and one of these may be used alone or a mixture of two or more thereof.

In the hydrocarbon organic polymer used in the present invention, the main chain is basically a hydrocarbon, and other components in the main chain (eg, O, N, Si, halogen, etc.)
One or more hydrocarbon-based organic polymers having a content of 10% by weight or less, preferably 5% by weight or less are used. Examples of such hydrocarbon organic polymers are shown below.

(1) Polyolefin polymers: homopolymers of α-olefins such as polymethylene, polyethylene and polypropylene, copolymers of olefins,
Examples thereof include copolymers of α-olefins with other monomers such as vinyl acetate, ethyl acrylate, ethyl methacrylate, and the like, and lightly halogenated polymers thereof. It may be amorphous to low crystalline or crystalline.

(2) Thermoplastic elastomers: Among the known or known thermoplastic elastomers in the field of rubber and plastics, T of paraffins used at least at the above room temperature or higher. _In the temperature range of _max + 10 ° C, preferably, at least room temperature or higher, and in the temperature range of T _max + 20 ° C, a material having rubber elasticity is used. Of course, it is possible to use a material that maintains rubber elasticity even at a temperature higher than T _max + 20 ° C. Specifically, various conventionally known thermoplastic elastomers such as styrene type, olefin type, urethane type and ester type can be exemplified.

(3) Hydrocarbon rubbers: natural rubber, styrene-butadiene-copolymer rubber, butyl rubber, isoprene rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene terpolymer rubber, ethylene −
Examples thereof include vinyl acetate copolymer rubber and ethylene-ethyl acrylate copolymer rubber.

The hydrocarbon-based organic polymer as the binder component may be either crosslinkable or non-crosslinkable, but it is preferable that each of them has rubber-like properties rather than plastics properties.

In the present invention, the amount of the hydrocarbon organic polymer used is 5 to 3 with respect to 100 parts by weight of paraffins.
0 parts by weight. If the amount is less than 5 parts by weight, the flexibility of the resulting composition tends to be low and the composition tends to be brittle, and paraffins tend to exude or melt easily at T _max or more, while an excessive amount exceeding 30 parts by weight is required. In that case, the amount of paraffins used will decrease and the amount of heat storage will decrease in proportion.

When it is desired to crosslink or vulcanize the hydrocarbon organic polymer (hereinafter collectively referred to as "crosslinking"), they are carried out during or after mixing with the paraffins. As a method of crosslinking, any of generally used chemical crosslinking, silane crosslinking (water crosslinking), irradiation crosslinking and the like can be adopted. When the heat storage material of the present invention is cross-linked, the degree of cross-linking is JIS
1% by weight in terms of gel fraction measured according to C 3005
Above (as a composition), preferably at least 2% by weight. By setting the degree of cross-linking to be 1% or more, preferably 2% or more, the temperature of the heat storage material is T _{max of} the paraffins used.
Even in the above case, the shape can be maintained without melting or dropping.

In the present invention, the binder component consisting of a hydrocarbon-based organic polymer is particularly preferably the following A or its cross-linked product or B material. In such a case, the affinity between the paraffins and the binder component is particularly good. The amount of the molecule is 5 to 30 parts by weight) can be contained in the hydrocarbon-based organic polymer particles.

A. Combination system of the hydrocarbon rubber of the above (3) and the polyolefin polymer of the above (1): Especially as the polyolefin polymer in this case, a homopolymer such as polymethylene, polyethylene, polystyrene, etc., or olefins Copolymers of olefins with other monomers such as vinyl acetate, acrylic acid,
Copolymers with methacrylic acid and the like, and these are used alone or in combination of two or more. Among them, JIS K 71
21. High crystallinity having a maximum crystal transition temperature (usually corresponding to the melting point) measured by 21 (the method for measuring the transition temperature of plastics) is at least 10 ° C. higher than T _{max of} the paraffin used, preferably at least 10 T higher than T _max 20
What is higher by ℃ is used. This crystalline polyolefin, while being used in combination with a hydrocarbon rubber, has appropriate flexibility and surely achieves shape retention. Moreover, it is not brittle and does not crack even when formed, and maintains sufficient holding properties. The mixing ratio of the three components is 100 parts by weight of paraffins, 1 to 20 parts by weight of hydrocarbon rubber, and preferably 5 to 5 parts.
15 parts by weight, 1 to 20 parts by weight of polyolefin polymers, preferably 5 to 15 parts by weight. In this mixed system, the heat storage material may be in a non-crosslinked state, but the gel fraction is at least 1% by weight, preferably at least 2% by weight, and a suitable method such as the above-mentioned chemical crosslinking method, water crosslinking method and irradiation crosslinking method. In particular, it is preferably crosslinked by the water crosslinking method.

B. (2) Thermoplastic elastomers: Paraffins preferably exhibiting rubber elasticity at least at T _max or less. In this case, at a temperature of T _max or lower, since it has rubber elasticity and can be favorably supported by the thermoplastic elastomer in a state of wrapping the paraffins well, the mixture is easy to handle, crack resistant, and easy to mold. Further the elastomer is T than _{ma x} to sustain rubber elasticity even at high temperatures, the heat storage material of the present invention is not to be dropped or melted.

The above-mentioned paraffins and hydrocarbon-based organic polymers are mixed at the above-mentioned ratios by mechanical means to form the heat storage material of the present invention. Mixing by mechanical means means paraffins. Due to the swelling, preferably the dissolution of the remaining components in the melt of at least one component in both of the hydrocarbon-based organic polymers, or the high temperature, any of the components to be mixed are flow-deformed by external force. It means the act of stirring, mixing, or kneading in a wet state.
For example, a mode in which a hydrocarbon-based organic polymer is dissolved in a melt of paraffins maintained at 100 to 200 ° C., and the resulting high temperature solution is stirred and mixed, a temperature at which each mixed component is softened, for example, 50 to 250 ° C. In this case, a mode in which the kneading and mixing is performed by using an ordinary kneader such as a two-roll, a Banbury mixer, an extruder and a twin-screw kneading extruder is exemplified. The degree of mixing is preferably as sufficient as possible, but generally 1 to 15
The mixing is performed for about 0 minutes, and it is judged to be visually uniformly mixed.

The heat storage material may further contain, if necessary, for example, an antioxidant, an antioxidant, a colorant, a pigment, an antistatic agent, a fungicide, a flame retardant, and a heat transfer agent depending on the use. Various additives such as metal powder, metal fibers, metal oxides, carbon, and carbon fibers can be added for improvement.

The above composition which has been mixed and made into a solution may be molded as it is or after being slightly cooled to form a heat storage board. As the molding method, a method of casting into a mold, a method of extruding into a sheet shape or a plate shape with an extruder, and the like are possible, but in general, a casting method that is easy to mold into a desired shape is preferable.

The recess formed on one surface of the heat storage board is
For example, as shown in the plan view of FIG. 2, a shape in which convex portions are left on both side edges (FIG. A), a square (FIG. B), a circle (FIG. C), an ellipse (D)
Figure), polygon (e figure), etc., and, as shown in the longitudinal sectional view of FIG. 3, a square shape (a figure), a trapezoidal shape (b figure),
It is formed in a bowl shape (Fig. C), a comb shape (Fig. D), or the like.
As shown in the plan view of FIG. 4, it is also possible to form a large number of the above-mentioned planar shapes into a lattice type (FIG. A), a porous type (FIG. B), a honeycomb type (FIG. C), or the like. The heat storage board formed with the recessed portion having the above-described shape has excellent absorption efficiency of thermal expansion and contraction, and particularly, the heat storage board having the recessed portion of the planar shape of the lattice type, the porous type or the honeycomb shape has the strength in the central portion. Highly preferred. When the recesses are formed on both sides of the heat storage board, the absorption efficiency of thermal expansion and contraction is further improved.

In the present invention, the recess is formed to have a volume ratio corresponding to 2 to 30%, preferably 5 to 20% of the volume of the entire heat storage board. If the volume of this recess is less than the above range, the absorption efficiency of thermal expansion / contraction becomes insufficient, while if it exceeds the above range, the heat storage / heat dissipation efficiency of the heat storage board decreases, and the strength of the heat storage board decreases. Is reduced, which is not preferable.

The heat storage board of the present invention is preferably used after being packaged in an Al laminated bag or the like, because it can prevent external damage and improve thermal conductivity.

Next, the floor heating structure of the present invention will be described in detail with reference to the drawings. FIG. 5: is sectional drawing of the floor heating structure which shows one Example of this invention. In the figure, 11 is a base material layer, 12 is a heat insulating material, 13 is a heating element, 14 is a mortar layer, 15 is a wire mesh, 16 is a floor material, T is a heat storage board, and 2 is a recess.

As the base material layer 11, concrete, mortar or the like can be used. A heat insulating material 12 is embedded in the base material layer 11. As the heat insulating material 12, expanded polystyrene, expanded polyurethane, expanded polyethylene,
Gypsum board, asbestos board, foam concrete, etc. can be used,
Hard urethane foam and polystyrene foam, which have excellent heat insulation and are inexpensive, are preferable.

In the present invention, the heat storage board T is laid on the base material layer 11. Recess 2 on the bottom of the heat storage board
When the heat storage board is laid, it is preferable to provide the heat storage board so that the top surface is in contact with the heating element as shown in FIG. As a result, heat exchange is effectively performed, and
Even if the volume of the heat storage board changes, the change is absorbed by the concave portion, so that the heat storage board itself can be prevented from being damaged and cracks of the mortar layer 14 and the like above it can be prevented.

In the floor heating structure of the present invention, the heating element 13 is used.
As such, an electric heater, a heat medium circulating pipe, or the like is used.
Wire heaters and surface heaters are generally used as electric heaters, and copper pipes, steel pipes, metal pipes such as stainless steel pipes, cross-linked polyethylene pipes, polybutene pipes, nylon pipes, and other synthetic resin pipes are used as heat medium circulation pipes. Any of the commonly used materials such as pipes can be used. The size of these pipes may be appropriately determined according to the design or the like according to the purpose of use, but normally, those having a nominal diameter of 6A to 25A are preferably used.

The mortar layer 14 is provided after laying the heating element 13 (however, when the heating element 13 is not laid, the heat storage board T). A wire mesh 15 is preferably embedded in the mortar layer 14. This allows
The strength of the floor structure can be improved.

After providing the mortar layer 14 and arranging the floor material 16 on the surface, the floor heating structure of the present invention shown in FIG. 5 is obtained. As the floor material 16, a general floor finishing material such as a vinyl chloride sheet, a tile carpet, and a flooring can be used.

[0031]

According to the above structure, since the recess is formed on one surface of the heat storage board, the volume change of the heat storage board due to heat storage or heat dissipation and thermal expansion / contraction of the heat storage material is absorbed in this recess. become. Therefore, it is possible to prevent the heat storage board itself from being damaged and the members such as mortar and the like provided on the heat storage board from being cracked or distorted due to repeated volume changes of the heat storage board. Further, since the heat storage board is molded so that the recess has a specific volume ratio, the heat storage / heat radiation efficiency is hardly reduced, and the strength required for the board can be maintained.

[0032]

EXAMPLES Hereinafter, the present invention will be described more specifically by showing examples. Needless to say, the present invention is not limited to this. Example 1 [Production of heat storage board] Composition of heat storage material Paraffin having a melting point of 115 ° F 50 parts by weight Palmityl alcohol (trade name NAA-44 manufactured by NOF CORPORATION) 50 parts by weight SEBS thermoplastic elastomer 15 parts by weight (Shell Chemical Co., Ltd. Product name: Kraton G) Polyethylene wax 5 parts by weight Antioxidant 0.5 parts by weight The above composition is melt-forced agitated at a temperature of 130 to 150 ° C. for 1 to 2 hours by a stir mixer to obtain a heat storage material. Prepared. The heat storage temperature of this heat storage material is 41 ° C, and the heat storage amount is 41Ca.
It was l / g. However, the measurement is based on JIS K 7121.
And JIS K 7122.

The heat storage material has a length of 70 cm and a width of 20 at the bottom.
cm, the height is 25 mm, and the temperature is 80 cm, the width is 25 cm, and a stainless steel case with a width of 25 cm is poured into the stainless steel case, cast, and cooled. It was made. The volume of the concave portion 2 of the heat storage board T is
The volume was 10% with respect to the volume of the entire heat storage board when the recess 2 was not provided.

[Construction of Floor Heating Structure] The heat storage board T is placed on a concrete floor 11 having a thickness of 100 mm in which a commercially available heat insulating sheet 12 having a thickness of 50 mm is embedded so as to have a structure similar to that shown in FIG. , Laying so that the concave portion 2 faces downward,
Further, a heating wire heater 13 was laid on it. On this wire heater 13, a mortar layer 1 having a wire diameter of 2.6 mm and a wire mesh 15 of 50 × 50 mm unit is embedded and having a thickness of 50 mm.
4 was provided and a floor finishing material 16 made of a vinyl material was laid on the surface thereof to form a floor heating structure. Energize the wire heater 13 for 8 hours to store heat in the heat storage board T,
After that, the energization was stopped for 16 hours so that the heat was dissipated from the heat storage board T. After repeating the above operation 150 times, disassembling the floor and observing the inside, no abnormality was found in the heat storage board T, the mortar layer 14 and the like.

Comparative Example 1 A heat storage board was manufactured in the same manner as in Example 1 except that the heat storage board T was not formed with a recess, and a floor heating structure was formed in the same manner except that this heat storage board was used. When heat was stored and radiated on the heat storage board T, several cracks were observed in the mortar layer 14.

Embodiments 2 to 4 In the above Embodiment 1, the concave portion 2 of the heat storage board T is shown in FIG.
Three types of heat storage boards were produced in exactly the same manner except that the heat storage boards were formed to have the same shapes as those in (a) to (c). When the heat storage board was formed and heat was stored and radiated 150 times, the heat storage board T and the mortar layer 1 were formed.
No abnormality was observed in the 4th magnitude.

[0037]

As described above in detail, in the heat storage board of the present invention, the concave portion is formed on at least one side, and the volume of this concave portion is set to a specific volume ratio with respect to the volume of the entire heat storage board.・ Reduction of heat dissipation efficiency is suppressed and
The strength of the board itself is maintained and the volume change of the heat storage board can be absorbed. Therefore, it is possible to prevent the damage of the heat storage board itself and the occurrence of cracks, distortions, and the like in members such as mortar laid on the heat storage board due to the repeated volume change of the heat storage board. Further, when the floor heating structure is formed by using this heat storage board, it is possible to prevent the heat storage board itself or the heating structure member from being damaged, and it becomes possible to stably operate the floor heating for a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat storage board showing an embodiment of the present invention.

FIG. 2 is a plan view showing the shape of a recess provided in the heat storage board.

FIG. 3 is a vertical cross-sectional view showing the shape of a recess provided on the heat storage board.

FIG. 4 is a plan view showing another example of the shape of the recess provided on the heat storage board.

FIG. 5 is a sectional view showing an example of a floor heating structure of the present invention.

FIG. 6 is a sectional view showing an example of a conventional floor heating structure.

[Explanation of symbols]

 1 heat storage material 2 recess T heat storage board

Claims (4)

[Claims] 1. A board comprising a heat storage shape retainer obtained by mixing 100 parts by weight of paraffins and 5 to 30 parts by weight of a hydrocarbon-based organic polymer by mechanical means, the board having at least one surface. , A heat storage board formed by forming a recess. 2. The heat storage board according to claim 1, wherein the recess is formed in a volume corresponding to 2 to 30% of the volume of the entire heat storage board. 3. A board made of a heat storage shape retainer obtained by mixing 100 parts by weight of paraffins and 5 to 30 parts by weight of a hydrocarbon-based organic polymer by a mechanical means to form a recess in at least a lower surface part. A floor heating structure in which a heat storage board is laid under the floor material so that the upper surface of the heat storage board faces the floor material. 4. The floor heating structure according to claim 3, wherein a heating element is laid on the upper surface of the heat storage board.