JP2002071152A - Floor heating panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive floor heating panel exhibiting excellent soundproof performance and walking feeling and suitable for reform. SOLUTION: The floor heating panel comprises a planar body 2, a planar heater 3, a foamed hard resin 4, and a foamed soft resin 5 laid sequentially in layers from the surface side and has total thickness of 7-25 mm. Assuming the thickness of the planar body 2 is 1, thickness of the planar heater 3 is set in the range of 0.02-0.25, thickness of the foamed hard resin 4 is set in the range of 1-5, and thickness of the foamed soft resin 5 is set in the range of 0.2-2.5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a floor heating panel.

[0002]

2. Description of the Related Art Conventionally, as floor heating used in an apartment house, a warm water mat or the like is laid on a floor slab, and a soundproof floor material is laid thereon to ensure soundproof performance.

[0003] In such floor heating, since the soundproofing floor material must be installed on a hot water mat or the like, the total thickness of the floor from the floor slab becomes large, and when the apartment is renovated, the floor and the like are required to be installed. It was not possible to make arrangements, and it was necessary to cut down the lower part of the door and the like. Further, a soft resin foam such as a non-woven absorbent layer or a buffer layer or a non-woven fabric is adhered to the lower surface of the soundproof floor material, but these have a problem that thermal efficiency is low due to their heat insulating properties.

For this reason, a soundproofing material is adhered to the backside of a heating panel formed by arranging heating means on the backside of the surface material, and a cushion material is further adhered to the backside of the soundproofing material. Heating panels have been proposed (see, for example,
No. 61435).

[0005]

However, in the above-mentioned floor heating panel, the soaking plate and the film heater as heating means are arranged in the recess formed on the back surface of the surface material. A step of providing a concave portion for fitting the heating means on the side and a step of fitting the heating means into the concave portion of the surface material are required, which has a disadvantage that the number of steps is increased. Also, a section of a convex portion necessary for fitting the heating means into the surface material is required, and the bending rigidity is increased by that amount, and the soundproof performance is reduced.

Further, since the soundproofing material is stuck on the back surface of the surface material and the cushion material is stuck on the back surface of the soundproofing material, the soundproofing is excellent, but the rigidity of the surface material and the soundproofing material is large. Therefore, in order to ensure high soundproofing, it is necessary to increase the thickness of the cushion material. Therefore, a floor material having high soundproofing property is greatly submerged in response to a load, and a new problem that a feeling of discomfort called a “sickness phenomenon” occurs when walking on the floor material occurs.

The present invention has been made in view of the above-mentioned problems, and provides an inexpensive floor heating panel which is easy to construct, has high thermal efficiency, is excellent in walking sensation while satisfying soundproof performance. It is.

[0008]

A floor heating panel according to the present invention comprises a plate-like body, a sheet-like heating element, a hard resin foam,
When the soft resin foam is a laminated body sequentially laminated, the overall thickness of the laminated body is 7 mm or more and 25 mm or less, and when the thickness of the plate-like body is set to 1, the thickness of the sheet heating element is 0.02 or more and 0.25 or less, and the thickness of the hard resin foam is 1
Not less than 5 and not more than 0.2 and not less than 2.5
It is characterized by the following.

[0009] In the present invention, the hard resin foam
The flexural modulus measured according to JIS K 7203 is preferably 294 MPa or less.

[0010] In the present invention, JIS of the laminated body
It is preferable that the lightweight floor impact sound estimated value measured based on A1418 is LL-45 or less.

[0011] The plate-like body used in the present invention is not particularly limited as long as it is a material that does not easily break or be damaged by a load normally applied to a flooring material. For example, a veneer, a plywood, a particle board , High-density fiberboard (hereinafter,
"HDF". ), Medium density fiberboard (hereinafter “MD”)
F ". ); Thermoplastic resins such as polyethylene, polypropylene and polyvinyl chloride; thermosetting resins such as polyester and epoxy resin; floor materials such as cushion floors, linoleum floors and carpets; and laminates thereof. Can be Among these, from the viewpoints of soundproofing, workability and texture, HD
A simple substance such as F, MDF or plywood or a laminate thereof is preferable. Also, cushion floor and linoleum floor,
In the case of using a flexible material such as a carpet, it is preferable to laminate HDF, MDF, plywood alone or on a laminate thereof in terms of walking feeling and the like.

If the thickness of the plate-like body is too small, it is easily broken when walking or placing a heavy object, and if it is too thick, not only does the soundproofing deteriorate, but also the overall thickness of the floor heating panel increases,
Since it becomes unsuitable for reforming, 3 to 5 mm is preferable.

If necessary, a surface decorative material such as a veneer, a synthetic resin or a synthetic resin foam sheet, decorative paper, a synthetic resin impregnated sheet, etc. is adhered and laminated on the plate-like body. May be mounted on the vehicle. In this case, it is preferable to bond and laminate on both surfaces of the plate-like body so that warpage does not occur. Further, printing, painting, coloring, coating, and the like may be performed in order to impart design, woody texture, scratch resistance, and the like.

[0014] The plate-like body may be provided with a concave groove extending in an arbitrary direction on the lamination surface with the hard resin foam, thereby further reducing the bending rigidity of the plate-like body and improving the soundproofness. It is possible to improve. The shape of the concave groove is usually U-shaped, V-shaped, U-shaped, etc., and the groove width is
The groove depth is about 1.5 to 2.5 mm, and the groove depth is 0.5 to 1.
3 mm.

The plate-like body may be entirely or partially circumferentially processed for a conventionally known joining method such as a claw or a chip.

The planar heating element used in the present invention is not particularly limited. For example, a heating element in which a metallic material such as nichrome, iron, stainless steel, aluminum or the like is arranged in a flat plate, or a patterned stainless steel element is used. A known heating element such as a heating element using a metal plate such as a plate as a heating unit and a carbon resin composite can be used. In particular, cost,
From the viewpoint of heat uniformity, a heating element in which a stainless steel hoop material is disposed on a resin film is preferably used.

If the thickness of the sheet heating element is too large, the soundproofing performance may be reduced. Therefore, when the thickness of the plate-like body is 1, the thickness is 0.02 or more and 0.25 or less. Specifically, 0.1 mm or more and 1.0 mm or less are preferable,
It is particularly preferably from 0.1 mm to 0.5 mm.

It is preferable to provide a thin metal plate or a metal foil on the side of the above-mentioned sheet heating element on the side of the lamination surface with the plate-like element so as to provide uniformity of the heating section and to serve as a ground for emergency. As the metal material, metals such as copper, aluminum, and iron, and alloys thereof can be used. Among them, copper, aluminum and alloys thereof are preferable from the viewpoint of flexibility.

The hard resin foam used in the present invention is not particularly limited. However, if the compression modulus is too small, walking feeling may be impaired.
The compression modulus measured according to 7220 is 0.39
It is preferably at least 2 MPa, more preferably at least 0.49 MPa. In addition, if the flexural modulus is too large, the soundproofing performance deteriorates, so JIS K 7203
Is preferably 294 MPa or less, more preferably 216 MPa or less, and usually 49 MPa or more.

Examples of such a hard resin foam include a hard polyurethane foam having an expansion ratio of 5 to 25 times,
A polystyrene foam having an expansion ratio of 10 to 30 times, a polyolefin foam having an expansion ratio of 2 to 30 times, or a thermoplastic resin foam described in Japanese Patent Application Laid-Open No. 10-238091 filed earlier by the present applicant. Can be mentioned.

If the thickness of the hard resin foam is too large, not only may the sound insulation performance be reduced, but also the overall thickness of the floor heating panel increases, making it unsuitable for reforming. Conversely, if it is too thin, the heat insulation performance will decrease. From these facts, the thickness of the hard resin foam is 1 or more and 5 or less, preferably 1 or more and 4 or less when the thickness of the plate-like body is 1. Specifically, it is 4 mm or more and 10 mm or less, preferably 4 mm or more and 8 mm or less.

The thermoplastic resin foam described in Japanese Patent Application Laid-Open No. 10-238091 has a continuous foamed layer made of a thermoplastic resin, and a high foamed foam made of a thermoplastic resin disposed on at least one surface of the continuous foamed layer. And a low-foaming thin film made of a thermoplastic resin covering the outer surface of the high-foaming body, wherein a plurality of high-foaming bodies are thermally fused to each other via the low-foaming thin film.

The resin used for the continuous foam layer, high foam and low foam thin film constituting such a thermoplastic resin foam is not particularly limited as long as it is a foamable thermoplastic resin. An olefin-based resin such as polyethylene and polypropylene or a mixture thereof is preferred because the resulting thermoplastic resin foam can increase the smoothness. Furthermore, in order to achieve both surface smoothness and prevention of sinking during walking, it is preferable to use high-density polyethylene, homopolypropylene, or a mixture containing at least one of these.

The resin used for the continuous foam layer, high foam body and low foam thin film constituting the thermoplastic resin foam is as follows:
It is not necessary to use the same resin, but it is preferable to use the same resin because it is hard to break when walking or when a heavy object is placed. In this case, it is preferable that the resin used for the high-foamed body and the low-foamed thin film is formed of the same resin in view of adhesiveness.

If the expansion ratio of the thermoplastic resin foam is too low, the weight of the heating floor material cannot be reduced, and if it is too high, the sinking amount of the heating floor material increases. , More preferably 3 to 20 times, even more preferably 7 times.
It is up to 20 times.

For convenience, the reciprocal of the density measured according to JIS K 6767 is regarded as the expansion ratio.

As a method for producing the above-mentioned thermoplastic resin foam, for example, a foamable thermoplastic resin composition containing a foaming agent is foamed in a predetermined container, and the outer surface except one surface is made of a thermoplastic resin. After producing a high-foamed body covered with a low-foaming thin film, heat-sealing these high-foaming body and the low-foaming thin film, a continuous foam sheet layer made of a thermoplastic resin separately manufactured is laminated by heat-sealing or the like. Method.

More preferably, a foamable thermoplastic resin sheet in which a plurality of foamable thermoplastic resin granules described below, which are arranged in a plane, are integrally connected via a foamable thermoplastic resin thin film. A method of obtaining the thermoplastic resin foam by producing a foam and heating the foamable thermoplastic resin sheet to a temperature equal to or higher than the decomposition temperature of a foaming agent to foam the foam.

As a method for producing the foamable thermoplastic resin sheet, a thermoplastic resin and a foaming agent constituting the foamable thermoplastic resin sheet are supplied to an extruder to decompose the pyrolytic foaming agent. After being extruded into a sheet by melt-kneading at a temperature lower than the temperature, the sheet-like foamable thermoplastic resin in a softened state has a clearance smaller than the thickness of the sheet-like foamable thermoplastic resin, and at least one outer peripheral surface. A part of the sheet-like foaming thermoplastic resin in a softened state is introduced into a pair of shaping rolls in which a large number of recesses having a shape corresponding to the foamable thermoplastic resin granules are uniformly disposed. And press-fitting, followed by cooling and release.

The shape of the foamable thermoplastic resin particles is as follows:
There is no particular limitation, and examples thereof include a hexagon, a column, and a sphere, and the column is most preferable to uniformly foam the expandable thermoplastic resin particles.

When the expandable thermoplastic resin particles are cylindrical, the diameter is not particularly limited because the diameter varies depending on the expansion ratio and thickness of the target foam, but the diameter is too large. When the foaming speed is too small, the column is melted by heating at the time of foaming, easily deformed, and the one-dimensional foaming property cannot be exhibited. In addition, variations in thickness accuracy and weight accuracy increase, and the surface smoothness also decreases. Therefore, when the foamable thermoplastic resin particles are cylindrical, the diameter is preferably 1 to 30 mm, and 2 to 20 mm.
Is particularly preferred.

When the expandable thermoplastic resin particles are cylindrical, the height is not particularly limited because the height varies depending on the expansion ratio, thickness, etc. of the target foam. If it is too high, the foaming speed will decrease, and if it is too low, it will foam simultaneously with the foamable thermoplastic resin thin film, so that it will expand significantly in the width and longitudinal directions. Therefore, when the foamable thermoplastic resin particles are columnar, the height is preferably 1 to 30 mm, particularly preferably 2 to 20 mm.

The distance between the expandable thermoplastic resin granules is not particularly limited because it varies depending on the expansion ratio, thickness, etc. of the target foam. However, if the distance between the granules is too long. Insufficient filling may occur when the expandable thermoplastic resin particles expand, and if the expandability is too short, the area that can expand during expansion is insufficient, and the expandability tends to be large in the width direction and the longitudinal direction. Therefore, the center-to-center distance of the foamable thermoplastic resin particles is preferably 2 to 50 mm,
Particularly preferred is 3 to 30 mm.

In order to improve the thickness accuracy and weight accuracy of the finally obtained thermoplastic resin foam, to provide high surface smoothness and to make the expansion ratio uniform, the foamable thermoplastic resin granules are formed by foaming. It is necessary that they are arranged substantially uniformly in a plane on the thermoplastic resin sheet.

The mode in which the foamable thermoplastic resin particles are arranged substantially uniformly in a plane is not particularly limited. For example, they may be arranged in a lattice, but they are arranged in a staggered manner. Then, since the high foam obtained by foaming the individual foamable thermoplastic resin granules has a hexagonal column shape, a pseudo honeycomb structure is formed. For this reason, the surface smoothness of the obtained foam is improved, and the compressive strength is improved. Therefore, it is preferable that the foamable thermoplastic resin particles are arranged in a staggered manner.

The thermoplastic resin used for the expandable thermoplastic resin granules and the expandable thermoplastic resin thin film constituting the expandable thermoplastic resin sheet is the same as the resin used for the thermoplastic resin foam. Things are used.

The thermoplastic resin used for the foamable thermoplastic resin granules and the thermoplastic resin used for the foamable thermoplastic resin thin film need not be the same resin, but may be foamable and adhesive. From the viewpoint, it is preferable to use the same type of resin.

The thermoplastic resin used for the foamable thermoplastic resin sheet may be cross-linked, if necessary. This is because cross-linking can prevent foam breakage during foaming, increase the foaming ratio, and reduce the weight of the heating floor material.

The cross-linking method is not particularly limited. For example, a method in which a silane graft polymer is melt-kneaded in a thermoplastic resin and then subjected to a water treatment for cross-linking, or a method in which a peroxide is added to the thermoplastic resin, After melting and kneading at a temperature lower than the decomposition temperature of the product, a method of crosslinking by heating to a temperature higher than the decomposition temperature of the peroxide, a method of cross-linking by irradiating radiation, and the like can be given. However, a cross-linking method using a silane graft polymer is preferable in order to obtain a high cross-linking resin and a low (no) cross-linking resin described later.

The silane-grafted polymer is not particularly restricted but includes, for example, silane-grafted polyethylene and silane-grafted polypropylene.

The water treatment method in the above-mentioned crosslinking method includes a method of immersion in water and a method of exposure to water vapor. In these methods, when processing at a temperature higher than 100 ° C., it may be performed under pressure.

In the above water treatment, if the temperature of water and steam is low, the crosslinking reaction rate is reduced, and if the temperature is too high, the expandable thermoplastic resin sticks with heat. 50-130 ° C is preferred, 90-1
20 ° C. is particularly preferred.

If the time of the water treatment is short, the crosslinking reaction may not proceed completely. Therefore, the water treatment time is preferably in the range of 0.5 to 12 hours.

The method of mixing the silane graft polymer is as follows:
There is no particular limitation on the method as long as it can be uniformly mixed. For example, a method in which a thermoplastic resin and a silane graft polymer are supplied to a single-screw or twin-screw extruder and melt-kneaded, a method in which melt-kneading using a roll, a method in which melt-kneading using a kneader, and the like are exemplified.

If the silane graft polymer is added in too large an amount, the foaming ratio of the thermoplastic resin foam obtained due to excessive crosslinking decreases, and if the amount is too small, the cells break and the uniform foaming occurs. Since cells cannot be obtained, the amount of the silane graft polymer to be added is preferably from 5 to 50% by weight, particularly preferably from 10 to 35% by weight, based on the total thermoplastic resin.

When silane crosslinking is performed using a silane graft polymer, a silane crosslinking catalyst may be used if necessary. The silane crosslinking catalyst is not particularly limited as long as it promotes a crosslinking reaction between the silane graft polymers.For example, dibutyltin diacetate, dibutyltin dilaurate, dioctyltin dilaurate, tin octoate,
Examples include tin oleate, lead octane, zinc 2-ethylhexanoate, cobalt octoate, lead naphthenate, zinc cabrate, and zinc stearate.

When the addition amount of the silane crosslinking catalyst increases, the expansion ratio of the obtained thermoplastic resin foam decreases,
In addition, when the amount decreases, the crosslinking reaction rate decreases, and a large amount of time is required for water treatment.
0.001 to 100 parts by weight of the thermoplastic resin,
10 parts by weight is preferable, and 0.01 to 0.1 parts by weight is more preferable.

The thermoplastic resin used for the foamable thermoplastic resin granules is not particularly limited as described above, but a highly crosslinked thermoplastic resin having almost no compatibility with a foaming agent, a low crosslinked thermoplastic resin or a non-crosslinked thermoplastic resin. It is preferably a mixture with a crosslinked thermoplastic resin. In this case, at the time of foaming, the low-crosslinked thermoplastic resin or the non-crosslinked thermoplastic resin easily flows, so that the surface smoothness of the obtained thermoplastic resin foam is enhanced.

As the thermoplastic resin having little compatibility with the foaming agent (before crosslinking), two kinds of the above-mentioned thermoplastic resins (hereinafter referred to as a highly crosslinked resin regardless of the crosslinking performance of the resin itself) The resin forming the thermoplastic resin is referred to as “highly crosslinkable resin”, and the resin forming the low crosslinkable thermoplastic resin or the noncrosslinkable thermoplastic resin is referred to as “low (non) crosslinkable resin”. Can be used.

When the difference in the melt index (M1) between the highly crosslinkable resin and the low (non) crosslinkable resin increases, the highly crosslinked thermoplastic resin obtained by crosslinking, the low crosslinked thermoplastic resin or the non-crosslinked thermoplastic resin Are very coarsely dispersed, so that the foaming ratio of the obtained foam decreases. When the difference between the two melt indexes (M1) becomes smaller,
The compatibility between the highly crosslinked thermoplastic resin obtained by crosslinking and the low crosslinked thermoplastic resin or the non-crosslinked thermoplastic resin may be increased, and the surface smoothness of the obtained thermoplastic resin foam may be reduced. For this reason, the highly crosslinked thermoplastic resin and the low crosslinked thermoplastic resin or the non-crosslinked thermoplastic resin are uniformly and finely dispersed without being mutually compatible with each other, and to obtain a thermoplastic resin foam having a high expansion ratio, Difference of M1 of 5 to 13 g /
It is preferably 10 minutes, more preferably 7 to 11 g / 10 minutes.

The melt index (M1) is J
It is a value measured according to IS K 7210.

When the degree of crosslinking of the highly crosslinked thermoplastic resin is too high, the foaming ratio of the obtained thermoplastic resin foam decreases due to excessive crosslinking. Conversely, when the degree of crosslinking is too low, the cells break during foaming. A uniform cell may not be obtained. For this reason, it is preferable to set the gel fraction as an index of the degree of crosslinking to 5 to 40% by weight of the entire thermoplastic resin, and 10 to 35% by weight.
Is more preferable.

When the degree of crosslinking of the low-crosslinking thermoplastic resin or the non-crosslinking thermoplastic resin is high, the thermoplastic resin foam obtained due to excessive crosslinking decreases the fluidity, and the surface smoothness of the thermoplastic resin foam is reduced. The gel fraction, which is an index of the degree of crosslinking, is preferably 5% by weight or less, and is preferably 3% by weight.
The following is more preferred.

The gel fraction means that the crosslinked resin component is 12
Of the residual weight after immersion in xylene at 0 ° C. for 24 hours,
It means the weight percentage based on the weight of the crosslinked resin component before immersion in xylene.

Examples of the foaming agent to be added to the foamable thermoplastic resin granules and the foamable thermoplastic resin thin film include a pyrolytic foaming agent.

If the amount of the pyrolytic foaming agent is too large,
Since uniform cells are not formed due to foam breaking, and if the amount is too small, foaming may not be sufficiently performed. Therefore, the pyrolytic foaming agent is used in an amount of 1 to 25 parts by weight based on 100 parts by weight of the thermoplastic resin. It is preferable to add in a ratio.

The thermal decomposition type foaming agent is not particularly limited as long as it has a decomposition temperature higher than the melting temperature of the thermoplastic resin used. For example, sodium bicarbonate,
Inorganic pyrolytic foaming agents such as ammonium carbonate, ammonium bicarbonate, azide compounds and sodium borohydride; azodicarbonamide, azobisformamide, azobisisobutyronitrile, barium azodicarboxylate, diazoaminobenzene, N, N'-dinitrosopentamethylenetetramine, P-toluenesulfonylhydrazide, P, P'-oxybisbenzenesulfonylhydrazide, trihydrazinotriazine, and the like. When using a polyolefin-based ethylene resin as the thermoplastic resin, the decomposition temperature Azodicarbonamide, which is easy to adjust the decomposition rate and decomposition rate, generates a large amount of gas, and is excellent in hygiene, is preferable.

The soft resin foam used in the present invention is not particularly limited as long as it has a relatively small compression modulus as compared with the above-mentioned hard resin foam. For example, the foaming ratio is 10 to 30 times. Crosslinked polyethylene foams, polyurethane foams having an expansion ratio of 20 to 40 times, and the like are included.

The compression elastic modulus of the soft resin foam is not particularly limited, but if it is too small, walking feeling may be reduced, and if it is too large, soundproofing performance may be reduced.
96-0.02942 MPa is preferable.

If the thickness of the soft resin foam is too large, the walking feeling is reduced, and if it is too thin, the soundproofing performance is reduced.
When the thickness of the plate-like body is 1, the thickness is 0.1 or more and 2.5 or less, preferably 0.7 or more and 1.5 or less. Specifically, 2 mm or more and 9 mm or less, preferably 2.5 mm or more and 5 mm or less, more preferably 2.5 mm or more and 3.5 m or less.
m or less.

The above-mentioned soft resin foam may be subjected to groove processing or uneven processing in order to further increase the soundproofing performance or cope with unevenness of the floor substrate (generally, concrete) as required. (Function) According to the floor heating panel of the present invention, the thicknesses of the sheet heating element, the hard resin foam, and the soft resin foam are set with respect to the thickness of the plate in consideration of soundproofing and walking sensation. As a result, the soundproofing performance and walking sensation are extremely excellent, and the overall thickness is very thin, which is suitable for reforming. In addition, since it is not necessary to form a recess for fitting the sheet heating element into the plate-like body, it is possible to reduce the manufacturing cost. Further, while the plate-shaped body is laminated on the planar heating element, the thickness of the hard resin foam is larger than the thickness of the plate-shaped body, so that the thermal efficiency is excellent.

[0062]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a floor heating panel 1 according to the present invention.

The floor heating panel 1 has a plate-like body 2, a planar heating element 3, a hard resin foam 4, and a soft resin foam 5 laminated in this order from the front side.

As shown in FIG. 2, the sheet heating element 3 is made of a stainless steel hoop material 31 and an insulating film 32.
It is configured to be sandwiched between.

[0066]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 to 9 of the floor heating panel of the present invention will be described below.
And Comparative Examples 1 to 5 will be described.

Examples 1 to 9 and Comparative Examples 1 to 5 of these floor heating panels have thicknesses and thickness ratios shown in Table 1 below.

[0068]

[Table 1]

(Plate) The plywood adjusted to the thickness shown in Table 1 was cut into a length of 900 mm and a width of 145 mm, and a groove having a pitch of 10 mm and a width of 1 mm in the short side direction was used. In this case, the depth of the groove is set so that the plywood thickness of the grooved portion is 2
mm.

(Sheet Heating Element) A stainless steel hoop material (0.05 mm thick × 5 mm wide) was placed on an insulating film (P
ET, having a thickness of 0.1 mm) and having the same size as the above-mentioned plate-like body was used. Here, the thickness of the sheet heating element was adjusted by attaching an aluminum tape having a thickness of 0.5 mm to the entire surface thereof. The output is
The number of hoop materials installed was adjusted to 180 W / m ² .

(Hard Resin Foam) Hard resin foams 1 to 3 were prepared from the compositions shown in Table 2 below with the formulations shown in Table 2.

[0072]

[Table 2]

The low-density polyethylene was manufactured by Mitsubishi Chemical Corporation, product number "MF-90", melt index (MI) = 1.5 g / 10 minutes. The high-density polyethylene was manufactured by Nippon Polychem, product number “HY340”, melt index (MI) = 1.5 g / 10 min.
3 ", melt index (MI) = 10 g / 10 min, silane-grafted polypropylene manufactured by Mitsubishi Chemical Corporation, trade name" Linklon XPM800MH ", melt index (MI) = 11 g / 10 min, gel content after crosslinking 80% by weight as a silane-grafted high-density polyethylene manufactured by Mitsubishi Chemical Corporation under the trade name "Linklon HM60".
0A ", melt index (MI) = 11 g / 10
And a gel fraction of 80% by weight after crosslinking.

As the blowing agent, azodicarboxylic acid amide (manufactured by Otsuka Chemical Co., Ltd., product number “SO-20”, decomposition temperature 210
° C) was used.

The method for producing the hard resin foams 1 to 3 is as follows.

The composition having the composition and the composition shown in Table 2 was mixed with a twin-screw co-extruder (screw diameter 65 m).
m), melt-kneaded at 180 ° C, and have a surface length of 1200 m
The foamed resin sheet in a softened state was extruded from a T die having a m and a lip interval of 0.7 mm. Then, the extruded resin sheet was placed on one outer peripheral surface at a depth of 20 mm and a diameter of 4.0 m.
m are arranged in a zigzag pattern at 10 mm intervals, and the other has a smooth outer peripheral surface.
Between a pair of shaping rolls of 00 mm (clearance 1 mm)
And cooled and solidified, and immersed in steam at 115 ° C. for 4 hours to crosslink the silane-grafted polypropylene.

The foamable thermoplastic resin sheet thus obtained is placed on a polyfluoroethylene sheet,
Furthermore, after arranging a polyfluoroethylene sheet on its upper surface and supplying it to a hot air dryer at 230 ° C. to foam it,
Hard resin foams 1 to 3 were obtained by passing between 12 pairs of rolls set at 25 ° C. Here, after adjusting the roll interval to adjust the thickness as shown in Table 1, the one having the same size as the above-mentioned plate-like body was used.

The hard resin foam 4 was adjusted to the thickness shown in Table 1 and a 7-fold foam of styrene foam formed in the same size as the plate-like body was used.

In Table 2, the expansion ratio is JIS
The density was measured according to K 6767, and the reciprocal thereof was defined as the expansion ratio.

The flexural modulus is measured according to JIS K 720
3 was measured.

(Soft Resin Foam) A flexible urethane resin foam having a foaming ratio of 50 times and having the same size as the plate-like body and having the thickness shown in Table 1 was used.

(Preparation of Floor Heating Panel) The above-mentioned sheet heating element was attached to one surface of the above-mentioned plate-like body via a modified silicone-based adhesive, and then the backside thereof was placed via a modified silicon-based adhesive.
The above hard resin foams 1 to 4 were stuck and 0.0981M
After pressing for 30 minutes at a pressure of Pa, the pressure was released and the mixture was left for 24 hours to cure the adhesive. Thereafter, an adhesive mainly composed of a vinyl acetate emulsion was applied to the back surfaces of the hard resin foams 1 to 4 and the soft resin foam was adhered, and then pressed at a pressure of 0.0098 MPa for 30 minutes. Thereafter, the pressure was released and the mixture was left for 24 hours to cure the adhesive.

With respect to the floor heating panels thus obtained, Examples 1 to 9 and Comparative Examples 1 to 5 were evaluated for soundproofness and sinking amount.

For soundproofing, a lightweight floor impact sound level (LL value) was measured in accordance with JIS A1418. The sinking amount was measured by pressing a steel disc-shaped indenter having a diameter of 50 mm against the center of the floor heating panel with a force of 784 N.

The results are shown in Table 1 described above.

As is clear from Example 1 and Comparative Example 1 in Table 1, as the thickness of the sheet heating element increases, the soundproofing performance deteriorates.

Further, Examples 1, 2, 5, 6 and Comparative Example 2,
As is clear from 3, when the thickness of the hard resin foam is smaller than the thickness of the plate-like body, the soundproofing performance tends to deteriorate.

Further, when the structure as in Comparative Example 2, that is, when the thickness of the hard resin foam is too thin compared to the thickness of the plate-like body, the heat insulation performance of the hard resin foam deteriorates, The amount of heat that escapes to the floor substrate via the foam and the soft resin foam increases, so that efficient floor heating cannot be performed.

Further, as is apparent from Examples 1, 3, and 4 and Comparative Examples 4 and 5, when the thickness of the soft resin foam is larger than the thickness of the plate-like body, the soundproof performance tends to be improved. . However, when it was too thick as in Example 3, the walking feeling was extremely deteriorated, and Comparative Example 5 in which
The surface of the plate has cracked.

Further, comparing Examples 1, 7, 8, and 9, when the flexural modulus of the hard resin foam increases, the soundproofing performance tends to deteriorate.

[0091]

As described above, according to the floor heating panel of the present invention, the thicknesses of the sheet heating element, the hard resin foam, and the soft resin foam relative to the thickness of the plate-like body are soundproof and walking feeling. Therefore, the soundproofing performance and walking sensation are extremely excellent, and the overall thickness is very thin, which is suitable for reforming. Further, since it is not necessary to form a concave portion for fitting the sheet heating element into the plate-like body, it is possible to reduce the manufacturing cost. Further, while the plate-shaped body is laminated on the planar heating element, the thickness of the hard resin foam is larger than the thickness of the plate-shaped body, so that the thermal efficiency is excellent.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing one embodiment of a floor heating panel of the present invention.

FIG. 2 is a plan view showing an example of a planar heating element constituting the floor heating panel of FIG.

[Explanation of symbols]

 Reference Signs List 1 floor heating panel 2 plate-like body 3 planar heating element 4 hard resin foam 5 soft resin foam

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Yamamoto 2-2 Kamikaba Kaminokocho, Minami-ku, Kyoto Sekisui Kagaku Kogyo Co., Ltd. (72) Inventor Eiichi Kobayashi 3-21- Nishichiyogaoka, Nara City, Nara Prefecture 23 (72) Inventor Yasuhiro Asai 1-8 Ibukino, Midori-ku, Yokohama, Kanagawa Prefecture Nagatsuta Park Heights 308 F-term (reference) 3L072 AA01 AB03 AC02 AD01 AD02 AD17

Claims (3)

[Claims] 1. A laminate in which a plate-like body, a planar heating element, a hard resin foam, and a soft resin foam are sequentially laminated from the front side, and the total thickness of the laminate is 7 mm or more and 25 mm or less. And when the thickness of the plate-like body is 1, the thickness of the planar heating element is 0.02 or more and 0.25 or less, the thickness of the hard resin foam is 1 or more and 5 or less, and the thickness of the soft resin foam is 0.2
The floor heating panel, which is not less than 2.5 and not more than 2.5. 2. The hard resin foam according to JIS K7
The flexural modulus of elasticity measured in accordance with No. 203 is 294 MPa
The floor heating panel according to claim 1, wherein: 3. The floor heating panel according to claim 1, wherein the lightweight floor impact sound estimated value of the laminate measured in accordance with JIS A1418 is LL-45 or less. .