JP2001336278A - Floor structure and its setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor structure having excellent workability and reconcil ing soundproof performance and walking feeling and to provide its setting method. SOLUTION: This floor structure is laminated with a hard plate-like body 22, a thermoplastic resin foam body 1, an irregular absorbing layer 23, a wooden plate 32, and a resin foam body 33 in this order from the upper side. The thermoplastic resin foam body 1 comprises a sheet-like continuous foam layer 3, a plurality of high foam sections 2 arranged on the back face of the continuous foam layer 3, and a low form thin film 4 covering the whole surface of the high foam sections 2 together with the continuous foam layer 3. The irregular absorbing layer 23 and the wooden plate 32 are laminated via a double- coated tape 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor structure and a method for constructing the floor structure, and more particularly to a floor structure excellent in workability, particularly in renovation from a tatami mat, etc., in addition to having good soundproof performance and excellent walking feeling. And its construction method.

[0002]

2. Description of the Related Art Conventionally, carpets, dew tans, and the like have been often used as flooring materials, particularly in apartment houses. However, since carpets and dew cartons are apt to generate mold and mite and are easily soiled, there has been an increasing demand in recent years for floor materials which are easy to clean and have a sanitary hard plate-like main component. On the other hand, there has been an increasing demand for so-called "renovation", mainly in apartment buildings, in which a room with tatami mats is changed to a room using a floor material whose main component is a hard plate.

[0003] However, floor materials mainly composed of a hard plate-shaped body have a problem that sound due to impact is apt to be generated, and a living sound, that is, a walking sound or a falling sound of an object, is easily transmitted downstairs. In the renovation of a room where a tatami mat is constructed to a floor material having a hard plate-like body as a main component, the tatami mat is usually about 30 mm to 60 mm in thickness, whereas a hard plate-like body is mainly used. Since the floor material used as a component is about 10 to 20 mm thick, it is necessary to remove all of the existing floor material including the rough floor and joist at the lower part of the tatami when renovating, and reconstruct it from the floor material. An increase in construction cost and construction time due to complicated construction is a problem.

[0004] As a method of solving the above-mentioned problems in the remodeling, for example, in a floor material and a method of constructing a floor material described in Japanese Patent Application Laid-Open No. 10-280662, a rough floor and a joist under the existing tatami lower part are left. A method has been proposed in which many materials are sequentially constructed on a rough floor to form a floor structure at a construction site. However, the floor structure formed by this method uses a floor material in which a high-specific-gravity anti-vibration mat is laminated as a sound insulation layer on the back surface of the aforementioned hard plate-like body, and the hard plate-like body, the vibration-proof mat, and the vibration-proof mat are used. Because the mat and the support material are fixed to each other with a hook-and-loop fastener made of non-woven fabric, if the surface of the support material is not constructed flat, the anti-vibration mat itself is also constructed along the surface of the support material It is difficult to construct a hard plate-like surface evenly, and a low-damping anti-vibration mat and a hard plate-like body are laminated on a support material such as plywood, so soundproofing performance and good walking It is difficult to balance the feeling and also because many materials are laminated at the construction site,
It is difficult to ensure stable soundproofing performance because errors in construction are likely to occur. Moreover, since many materials are constructed during construction, the complexity of construction cannot be eliminated, and construction costs and construction time also increase.

On the other hand, as a method of solving the above-described problems based on floor materials having a hard plate as a main component, a porous body such as a foam or a nonwoven fabric is laminated as a buffer layer on the back of the hard plate. Many flooring materials have been proposed. For example, the flooring material described in Japanese Utility Model Publication No. 52-30125 has a soft high foam having an expansion ratio of 3 to 10 times and a soft low foam having an expansion ratio of less than 1.5 to 3 times formed on the back surface of a hard plate. Flooring Further, the flooring material described in Japanese Utility Model Publication No. 3-21395 is one in which the expansion ratios of the upper and lower buffer layers adjacent to the back surface of the hard plate are different from each other.
It is a flooring comprising a 50 times higher foaming layer and a 5 to 20 times lower foaming layer. When subjected to an impact force, these buffer layers are deformed and the impact action time is prolonged, reducing the peak value of the impact force and the natural frequency of the impact, preventing the propagation of sound and vibration due to the impact, and improving soundproofing. Although it is intended to improve the rigidity of the hard plate, the buffer layer needs to be thick in order to exhibit high soundproofing. Therefore, the floor material with high soundproofing property has a large sinking force with respect to the load, and there is a new problem that when walking on the upper surface of the floor material, a feeling of strangeness called "sickness phenomenon" is felt.

[0006] Further, as a floor material having a small sinking, for example, Japanese Utility Model Laid-Open Publication No. 56-3945 discloses a thickness of 0.3 to 1 mm.
Floor materials have been proposed in which a foam of 20 to 100 mm is laminated on the back surface of a hard plate of 5 mm. However, the foam used for the flooring is not particularly limited, and a normally used homogeneous foam has mechanical isotropy and a high compression modulus in order to reduce sinking. Then, the flexural modulus naturally increases, and high soundproofing cannot be expected.

[0007]

As described above, there are two contradictory problems, that is, soundproofing and sinking, and it is difficult to achieve both soundproofing and sinking prevention. It was difficult to add.

[0008] It is an object of the present invention to solve the above-mentioned problems and to provide a floor structure and a method for constructing the floor structure, which have both good soundproofing performance and walking sensation and excellent workability.

[0009]

According to a first aspect of the present invention, there is provided a floor structure in which a hard plate, a non-absorbent layer, a wooden board, and a resin foam are laminated in this order from the upper side.

[0010] The floor structure according to claim 2 is, from the top, a hard plate-like body / thermoplastic foam / non-absorbent absorbent layer / wood board /
The resin foam is laminated in this order. In the floor structure, a laminate of a hard plate-like body / non-woven absorbent layer or a laminate up to a hard plate-like body / thermoplastic foam / non-woven absorbent layer is referred to as “floor material”, wood board / The laminate of the resin foam is referred to as a “base board”.

According to a third aspect of the present invention, in the floor structure of the second aspect, the thermoplastic resin foam is disposed on a sheet-like continuous foam layer and a plurality of the foams on the back surface of the continuous foam layer. And a low-foaming thin film covering the entire surface of the high-foaming portion together with the continuous foaming layer, wherein the high-foaming portion is formed in a convex shape from the continuous foaming layer, and between adjacent high-foaming portions. Is formed in a concave shape, whereby irregularities are formed on the back surface of the thermoplastic resin foam.

According to a fourth aspect of the present invention, in the floor structure of the third aspect, the surface of the continuous foam layer in contact with each of the high foaming portions is formed in a concave shape.

As an example of a preferred embodiment of the floor structure according to any one of the first to fourth aspects, as described in the fifth aspect, the non-woven absorbent layer and the wooden board are laminated via a double-sided tape. Are included.

In another preferred embodiment of the floor structure according to any one of the first to fourth aspects, as described in the sixth aspect, the non-woven absorbent layer and the wooden board are partially connected via a double-sided tape. Ones that are laminated in a uniform manner.

The floor structure according to any one of the first to sixth aspects is the seventh aspect.
As described, the lower surface of the resin foam is preferably laid directly on the rough floor.

According to a eighth aspect of the present invention, there is provided a method of constructing a floor structure, comprising: a base board in which a wooden board is laminated on a resin foam; and a floor material in which a non-woven absorbing layer is laminated on the lower surface of a hard plate. A method of constructing a floor structure having a thickness substantially equal to that of a tatami mat to be constructed on a rough floor, wherein a resin foam surface of the foundation board is laid on the rough floor, and a wooden board surface of the foundation board is provided. It fixes the uneven absorption layer of the floor material.

According to a ninth aspect of the present invention, there is provided a floor constructing method, comprising: a base board in which a wooden board is laminated on a resin foam; and a hard plate / thermoplastic foam / a non-woven absorbent layer from the upper side in this order. Consisting of laminated floor material, the overall thickness to be constructed on a rough floor is a construction method of a floor structure substantially the same as a tatami mat, laying a resin foam surface of the base board on the rough floor,
The rugged absorbent layer of the floor material is fixed on the woody surface of the base board.

Another preferred embodiment of the method for constructing a floor structure according to any one of claims 8 to 9 is as follows.
As described in the above, there is a method in which a non-woven absorbent layer of a floor material is adhered to the woody board surface of the base board via a double-sided tape.

Another preferred embodiment of the method for constructing a floor structure according to the tenth aspect is a double-sided tape attached to a wooden board surface of the base board as described in the eleventh aspect. A method of arranging only the peripheral joint of the floor material and the longitudinal joint.

[Hard plate-like body] The hard plate-like body used in the floor structure according to any one of claims 1 to 11, is a material which does not easily break or be damaged by a load normally applied to the floor structure. There is no particular limitation as long as it is present. For example, 1) Woody material such as wood veneer, plywood, particle board, medium-density fiberboard (MDF), high-density fiberboard (HDF), hardboard, and parallel plywood (LVL) Materials 2) Resin materials consisting of thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, etc., thermosetting resins such as polyester, epoxy resin, etc. 3) Composite materials such as fiber reinforced thermosetting resin, fiber reinforced thermoplastic resin , And the like.

A surface decorative material such as a veneer, a synthetic resin or a synthetic resin foam sheet, decorative paper, or a synthetic resin impregnated sheet may be adhered and laminated on the hard plate-like body as required. Further, printing, painting, coloring, coating, and the like may be performed in order to impart designability, woody feel, scratch resistance, and the like.

The hard plate may be provided with a concave groove extending in an arbitrary direction on the lamination surface with the thermoplastic resin foam, thereby further reducing the bending rigidity of the hard plate and soundproofing. It is possible to further improve the performance. The shape of the concave groove is usually U-shaped, V-shaped, U-shaped, or the like, and the groove width is about 1 to 5 mm and the groove depth is about 1 to 5 mm.

The hard plate-shaped body may be provided with a process for a conventionally known joining method such as a core and a claw, a chipping, or the like on the whole or a part of the periphery thereof.

If the thickness of the hard plate is too thin, it is easily broken when walking or placing a heavy object, and if it is too thick, the soundproofing property is lowered. Therefore, the thickness is preferably 2 to 12 mm, more preferably 2 to 9 mm. And more preferably 2 to 6 mm.

The ratio of the thickness of the hard plate to the thickness of the thermoplastic resin foam is such that if the thickness of the hard plate is too thick, the rigidity of the floor structure is too large. The soundproofing property is reduced due to the increase, and if it is too thin, it is easily broken at the time of walking or placing a heavy object, so it is preferably 1 to 10 times, more preferably 1 to 10 times the thickness of the hard plate. 5
And more preferably 1 to 3 times.

Although the thickness of the floor structure is not particularly limited,
If it is too thick, the ceiling of the room will be low and the sinking during walking will be large, so it is preferably 20 mm or less.

[Thermoplastic resin foam] (Thermoplastic resin) A thermoplastic resin foam used for the floor structure according to any one of claims 2 to 7 and 9 to 11 (the floor structure according to claim 3 The thermoplastic resin used for the constituent continuous foamed layer, the low foamed thin film and the high foamed portion is not particularly limited. As such a thermoplastic resin, for example, low-density polyethylene, high-density polyethylene, linear low-density polyethylene (hereinafter, “polyethylene” refers to low-density polyethylene, high-density polyethylene,
Refers to linear low-density polyethylene or a mixture thereof. Olefin resins such as random polypropylene, homopolypropylene, block polypropylene (hereinafter, “polypropylene” refers to random polypropylene, homopolypropylene, block polypropylene, or a mixture thereof) and copolymers thereof;
Polyethylene vinyl acetate, polyvinyl chloride, chlorinated polyvinyl chloride, ABS resin, polystyrene, polycarbonate, polyamide, polyvinylidene fluoride, pophenylene sulfide, polysulfone, polyether ketone, and copolymers thereof, and the like. ,
They may be used alone or in combination.

Among the above thermoplastic resins, olefin resins such as polyethylene and polypropylene or a mixture thereof, which are easy to form irregularities, are preferable. The surface smoothness and the prevention of sinking of the resulting floor structure during walking are preferred. In order to achieve both, high-density polyethylene, homopolypropylene or a mixture containing at least one of these is particularly preferred.

Further, the thermoplastic resin 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 floor structure.

The resin used for the continuous foam layer, the high foam portion and the low foam thin film constituting the thermoplastic resin foam need not be the same resin. Because it is hard to break when placing things,
It is preferable to use the same type of resin. In this case, it is preferable that the resin used for the high-foamed portion 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 floor structure cannot be reduced, and if it is too high, the sinking amount of the floor structure increases. , More preferably 3 to 20 times, and still more preferably 5 to 20 times.
It is 10 times.

The thickness of the thermoplastic resin foam is preferably 3 to 50 mm, more preferably 3 to 30 mm, because if it is too thin, the soundproofing performance will decrease, and if it is too thick, the sinking amount of the floor structure will increase. More preferably, it is 5 to 10 mm.

(Form of thermoplastic resin foam)
7. The form of the thermoplastic resin foam used in the floor structure according to 7 includes a sheet-like continuous foam layer, a plurality of high foam portions disposed on the back surface of the continuous foam layer, and a surface of the high foam portion. It consists of a low-foaming thin film covering the entire surface together with the continuous foaming layer, the high foaming portion is formed in a convex shape from the continuous foaming layer, and the adjacent high foaming portions are formed in a concave shape, so that the thermoplastic resin is formed. The irregularities are formed on the back surface of the foam.

If the expansion ratio of the continuous foam layer is too low, it is difficult to reduce the weight of the floor structure, and the elastic modulus increases, so that the soundproofing performance decreases. If the expansion ratio is too high, the floor structure sinks. The amount is increased, and it is easy to break when walking or when a heavy object is placed, so it is preferably 1.1 to 10 times, more preferably 2 to 8 times, and still more preferably 2 to 7 times. It is.

If the thickness of the continuous foam layer is too small, the resulting floor structure tends to be broken when walking or when a heavy object is placed. The ratio is preferably 100 μm to 5 mm, more preferably 300 μm to 3 mm, and still more preferably 500 μm to 2 mm, since the proportion of the floor structure increases and the weight of the floor structure becomes difficult and the soundproofing performance decreases. The thickness of the continuous foam layer does not need to be uniform, and may be non-uniform. The continuous foam layer does not need to be a perfect flat plate, and may have some irregularities. Here, the thickness of the continuous foam layer means the average thickness of the continuous foam layer in a cross section parallel to the thickness direction of the thermoplastic resin foam.

If the expansion ratio of the high foaming portion is too low,
Because it is difficult to reduce the weight of the floor structure and the elastic modulus increases, the soundproofing performance is reduced. If the floor structure is too high, the amount of sinking of the floor structure increases, and when walking or placing a heavy object on the floor. 2 to 100 times is preferable, more preferably 5 to 50 times, and still more preferably 10 to
35 times.

If the size of the high-foaming portion is too small, it is difficult to reduce the weight of the floor structure, and if it is too large, the obtained floor structure is easily broken when walking or when a heavy object is placed. Therefore, it is preferably 3 to 50 mm, more preferably 5 to 30 mm. Note that the size of the highly foamed portion does not need to be uniform, and may be non-uniform. Here, the size of the highly foamed portion refers to the maximum value of the size of the cross section parallel to the thickness direction of the thermoplastic resin foam.

If the foaming ratio of the low-foaming thin film is too low, it is difficult to reduce the weight of the floor structure, and the elastic modulus increases, so that the soundproofing performance decreases. If the foaming ratio is too high, the floor structure sinks. The amount is increased, and it is easy to break when walking or when a heavy object is placed. Therefore, the ratio is preferably 1.1 to 10 times, more preferably 1.2 to 7 times, and further preferably 1. It is 2 to 5 times.

When the thickness of the low-foaming thin film is too small, the high-foamed portion becomes relatively large, and the compressive strength of the obtained floor structure decreases. When the thickness is too large, the soundproofing performance decreases.
To 500 μm, more preferably 40 to 400 μm.
μm, and more preferably 50 to 400 μm. The thickness of the low-foaming thin film does not need to be uniform, and may be non-uniform. Here, the thickness of the low-foaming thin film refers to an average thickness of a cross section of the thermoplastic resin foam which is parallel to the thickness direction of the thermoplastic resin foam.

The high foaming portion is generally arranged on one side of the continuous foam, but may be arranged on both sides.

The high foaming portion is formed in a convex shape with respect to the continuous foaming layer. If the height of the convex portion of the high foaming portion is too low, high soundproofing performance cannot be obtained.
m or more, more preferably 3 mm or more.

It is preferable that the back side of the continuous foam corresponding to each high foaming portion is formed in a concave shape. In the case where the concave shape is formed, if the depth of the concave portion is too large, high compressive strength is exhibited. This is difficult, the amount of sinking increases, and if it is too low, sufficient soundproofing cannot be obtained. Therefore, the thickness is preferably 1 to 5 mm, more preferably 1 to 3 mm.

When the high-foamed portions are at least partially in close contact with each other via the low-foamed thin film, the adhesion of the individual high-foamed portions is improved, and the high-foamed portions are broken when a heavy object is loaded on the floor. It is preferable because it becomes difficult.

As a method of the close contact, adhesion by an adhesive or the like is conceivable, but since it is formed of a thermoplastic resin, heat fusion is preferred from the viewpoint of the moldability of the floor structure.

In order to improve the thickness accuracy and weight accuracy of the thermoplastic resin foam and to reduce the variation in the compressive strength, a plurality of highly foamed portions should be arranged substantially uniformly in a plane in the cross-sectional direction of the foam. Is preferred. However, the mode of arranging the plurality of high-foaming portions substantially uniformly in a plane is not particularly limited, and may be arranged in a lattice.
They may be arranged in a staggered manner.

When a plurality of high-foamed portions are arranged in a lattice, each of the high-foamed portions has the shape of a quadrangular prism, and when formed into a floor structure, the sinking amount is reduced. The plastic resin particles are preferably arranged in a lattice.

When a plurality of high-foamed portions are arranged in a staggered manner, a structure in which a plurality of hexagonal column-shaped high-foamed portions are heat-sealed through a low-foamed thin film is formed, and a honeycomb-shaped thermoplastic resin as a whole is obtained. It is preferable because a resin foam is obtained, and a floor component having a particularly excellent sinking amount is obtained.

The ratio of the contact area of the protruding portion of the high foaming portion whose outer surface is covered with the low foaming thin film to the flat plate is preferably from 10 to 70%. If it is too small, the sinking amount of the floor structure increases.

If the filling rate of the thermoplastic resin foam is too large, high compressive strength cannot be exhibited, and the sinking amount increases, and if it is too small, the soundproofing property decreases. % Is preferable, and more preferably 50 to
90%.

(Method for Producing Thermoplastic Resin Foam) The method for producing the above thermoplastic resin foam is not particularly limited. For example, foamable thermoplastic resin pellets containing a foaming agent are foamed and melted. After forming a plurality of high-foaming portions made of a thermoplastic resin, the outer surface of which is covered with a low-foaming thin film made of a thermoplastic resin, excluding the adhesion surface, and then heat-sealing the high-foamed portions to each other via the low-foaming thin film. A method in which a continuous foamed layer made of a thermoplastic resin molded in a separate step is heat-sealed, and then formed into an uneven shape by hot pressing or the like. A foamable thermoplastic resin sheet in which thermoplastic resin granules are arranged substantially uniformly in a plane, and the foamable thermoplastic resin granules are integrally connected via a foamable thermoplastic resin thin film Body
Heating and foaming the foaming agent at a decomposition temperature or higher,
And cooling in a cooling mold having a gap larger than that of the foam obtained by foaming.

When the foamable thermoplastic resin sheet is foamed, a portion of the foamable thermoplastic resin granule foams. At this time, the outer surface of the thermoplastic resin granule retains bubbles generated by foaming. Since it is difficult, the foaming ratio is lower than that inside, and a low foamed thin film is obtained. As a result, the outer surface of the high foaming portion having a high foaming ratio inside the granular material is covered with the low foaming thin film. Further, the foamable thermoplastic resin thin film connecting the granules of the foamable thermoplastic resin sheet becomes a continuous foam layer, and a plurality of high foam portions are arranged on the continuous foam layer. In addition, the continuous foam layer is also thin,
Bubble retention becomes difficult, resulting in low foaming. Such a low-foaming thin film is closely fused with the low-foaming thin film of an adjacent granular material due to foaming inside the granular material. If the setting is such that the thermoplastic resin sheet is completely filled, the fusion proceeds only partially, and an uneven thermoplastic resin foam that is not completely filled can be obtained.

The thermoplastic resin used for the expandable thermoplastic resin granules constituting the expandable thermoplastic resin sheet and the expandable thermoplastic resin thin film include the resins used for the above thermoplastic resin foam. The same is used.

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

As described in the section of the thermoplastic resin foam, the thermoplastic resin used for the foamable thermoplastic resin sheet is intended to improve the expansion ratio and reduce the weight of the obtained thermoplastic resin foam. It is preferable to use a crosslinked one because it can be achieved. The crosslinking method is not particularly limited.For example, after melt-kneading the silane graft polymer into a thermoplastic resin, a water treatment is performed, and a method of crosslinking, the peroxide is added to the thermoplastic resin from the decomposition temperature of the peroxide. After melt-kneading at a low temperature, a method of crosslinking by heating to a temperature not lower than the decomposition temperature of the peroxide, a method of irradiating with radiation, and the like can be mentioned. 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 limited, and examples thereof include silane-grafted polyethylene and silane-grafted polypropylene.

The above-mentioned water treatment method includes a method of immersion in water and a method of exposure to water vapor.
When the treatment is performed at a temperature higher than 00 ° C., the treatment may be performed under pressure.

If the temperature of water and water vapor in the above water treatment is low, the crosslinking reaction rate is reduced. If the temperature is too high, the foamable thermoplastic resin is fused by heat.
The temperature is preferably 0 ° C, more preferably 90 to 120 ° C.

If the time for 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 of melt-kneading using a roll, a method of melt-kneading using a kneader, and the like are exemplified.

If the added amount of the silane graft polymer is too large, crosslinking is excessively performed, and the expansion ratio of the obtained thermoplastic resin foam is reduced. If the added amount is too small, cells are broken and uniform foam cells are formed. Therefore, the amount of the silane graft polymer to be added is preferably 5 to 50% by weight, more preferably 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,
Further, when the amount decreases, the crosslinking reaction rate decreases, and it takes time for water treatment. Therefore, based on 100 parts by weight of the thermoplastic resin, the addition amount of the silane crosslinking catalyst is preferably in the range of 0.001 to 10 parts by weight. , 0.01 to 0.1 part by weight is more preferable.

As described above, the foamable thermoplastic resin is not particularly limited, but comprises a mixture of a foaming agent, a highly crosslinked thermoplastic resin having little compatibility with each other, and a low crosslinked or non-crosslinked thermoplastic resin. In this case, since the low-crosslinking or non-crosslinking resin easily flows at the time of foaming, the uneven portion of the obtained uneven thermoplastic resin foam is easily formed, which is preferable.

The terms “highly crosslinked” and “lowly crosslinked” in the highly crosslinked thermoplastic resin and the lowly crosslinked or non-crosslinked thermoplastic resin are relative expressions determined by the degree of both crosslinks. A highly crosslinked thermoplastic resin is referred to as a highly crosslinked thermoplastic resin, and the other is referred to as a low crosslinked or non-crosslinked thermoplastic resin.

As the thermoplastic resin (before crosslinking) used for the two types of thermoplastic resins having little compatibility with each other, two of the above-mentioned thermoplastic resins (hereinafter referred to as crosslinking performance of the resin itself) are used. Rather, a resin that forms a highly crosslinked thermoplastic resin is referred to as a “highly crosslinkable resin”, and a resin that forms a low crosslinked or non-crosslinked thermoplastic resin is referred to as a “low (no) crosslinked resin”. Although it is possible, in order to uniformly and finely disperse the highly crosslinked thermoplastic resin and the low crosslinked or non-crosslinked thermoplastic resin without being compatible with each other, the thermoplastic resin of the highly crosslinked resin and the low (non) crosslinked resin is used. The difference in solubility parameter is preferably from 0.1 to 2.0, and more preferably from 0.2 to 1.5.

If the difference in the solubility parameter exceeds 2.0, the highly crosslinked thermoplastic resin obtained by crosslinking and the low or non-crosslinked thermoplastic resin are very coarsely dispersed.
The expansion ratio of the obtained uneven thermoplastic resin foam decreases. On the other hand, if the difference in the solubility parameter is smaller than 0.1, the compatibility of the highly crosslinked thermoplastic resin obtained by crosslinking and the low crosslinked or non-crosslinked thermoplastic resin becomes high, and the obtained uneven thermoplastic resin foam is Surface smoothness decreases.

The solubility parameter is σ = ρΣFi
/ M. Here, ρ is the density of the resin component, M is the molecular weight of the monomer constituting the resin component, Fi
Is the number of moles of the monomer group.

When the difference in the melt index (MI) between the highly crosslinkable resin and the low (non) crosslinkable resin increases, the high crosslinkable thermoplastic resin obtained by crosslinking and the low crosslinkable or noncrosslinkable thermoplastic resin Because it is very coarsely dispersed, the expansion ratio of the obtained uneven thermoplastic resin foam is reduced and becomes smaller, and the compatibility of the highly crosslinked thermoplastic resin obtained by crosslinking and the low crosslinked or non-crosslinked thermoplastic resin is high. Because it may be difficult to form the irregularities of the resulting irregular thermoplastic resin foam, the highly crosslinked thermoplastic resin and the low crosslinked or non-crosslinked thermoplastic resin are finely divided without being compatible with each other. In order to obtain a thermoplastic resin foam having a high expansion ratio and a high expansion ratio, the MI difference is 5 to 13 g / 1.
0 minutes is preferable, and 7-11 g / 10 minutes is more preferable.

The MI in this specification is JIS
It is a value measured according to K7210. In order to obtain a highly crosslinked thermoplastic resin obtained by crosslinking, a low crosslinked or non-crosslinked thermoplastic resin is uniformly and finely dispersed, and to obtain a thermoplastic resin foam having a high expansion ratio with excellent surface smoothness,
The mixing ratio between the highly crosslinkable resin and the low (non-) crosslinkable resin is desirably 2: 8 to 8: 2 by weight, and 4: 6.
~ 6: 4 is more preferable.

If the degree of cross-linking of the highly cross-linked thermoplastic resin is too high, cross-linking is excessively applied, and the expansion ratio of the obtained irregular thermoplastic resin foam decreases. Conversely, if it is too low, the cells break during foaming. Since a uniform cell may not be obtained,
The gel fraction serving as an index of the degree of crosslinking is preferably 5 to 40% by weight, more preferably 10 to 30% by weight.

If the degree of crosslinking of the low-crosslinking or non-crosslinking thermoplastic resin is high, crosslinking is excessive, and the fluidity of the obtained irregular thermoplastic resin foam is reduced, so that it may be difficult to form irregularities. 5% by weight of gel fraction which is an indicator of the degree of crosslinking
Or less, more preferably 3% by weight or less.

The gel fraction in this specification refers to the percentage by weight of the residue weight after immersing the crosslinked resin component in xylene at 120 ° C. for 24 hours based on the weight of the crosslinked resin component before immersion in xylene.

As a method for preparing a mixture of a highly crosslinked thermoplastic resin and a low crosslinked or non-crosslinked thermoplastic resin having almost no compatibility with each other, the above two types of thermoplastic resins are mixed and only the highly crosslinked resin is mixed. Or by cross-linking a highly crosslinkable resin preferentially over a low (no) crosslinkable resin.

As a method of preferentially crosslinking a highly crosslinkable resin alone or a highly crosslinkable resin over a low (non) crosslinkable resin, for example, only a highly crosslinkable resin or a more highly crosslinkable resin than a low (non) crosslinkable resin is used. A method of crosslinking using a crosslinking agent that preferentially crosslinks a resin. In the first step, a highly crosslinkable resin having a crosslinkable functional group is mixed with the same kind of crosslinkable resin to form a crosslinkable thermoplastic resin. Is formed, and in a second step, this is mixed with a non-crosslinkable resin.

It should be noted that the highly crosslinked thermoplastic resin and the low crosslinked or non-crosslinked thermoplastic resin can be uniformly and finely dispersed, that the highly crosslinked resin is easily crosslinked preferentially, and that the thermoplastic resin can be easily prepared. From, having almost the same melt index as the highly crosslinkable resin, and having a crosslinkable functional group, after mixing the same type of crosslinkable resin with the high crosslinkable resin, together with the high crosslinkable resin and the low crosslinkable resin,
The method of crosslinking is preferred.

The crosslinkable resin of the same kind as the highly crosslinkable resin having a crosslinkable functional group having almost the same melt index as the highly crosslinkable resin may be a thermoplastic resin having a reactive functional group and capable of being crosslinked. It is not particularly limited. Examples of such a functional group include the above-described thermoplastic resins having an unsaturated group such as a vinyl group, an allyl group, and a propenyl group, a hydroxyl group, a carboxyl group, an epoxy group, an amino group, a silanol group, and a silanate group. Can be

Specific examples of the crosslinkable resin include maleic acid-modified polyethylene, maleic acid-modified polypropylene, silane-modified polyethylene, and silane-modified polypropylene. Silane-modified polyethylene and silane-modified polypropylene are preferred because it is easy to preferentially crosslink a highly crosslinkable resin only over a highly crosslinkable resin or a low (no) crosslinkable resin, and is easy to crosslink after mixing. .

If the difference in the melt index between the highly crosslinkable resin and the crosslinkable resin is large, it becomes difficult to crosslink only the highly crosslinkable resin or to preferentially crosslink the highly crosslinkable resin over the low (no) crosslinkable resin. Melt index difference is 2
g / 10 min or less, more preferably 1 g / 10 min.
Minutes or less.

Examples of the method of crosslinking the crosslinkable resin having a crosslinkable functional group include a method of crosslinking with a peroxide,
Examples of the method include a method of crosslinking with an isocyanate, a method of crosslinking with an amine, and a method of hydrolyzing a reactive functional group followed by water crosslinking.

The method of crosslinking with water after hydrolyzing the reactive functional group is most preferable because the crosslinking after mixing is easy.

(Blowing Agent) A pyrolytic blowing agent is used as a blowing agent contained in the expandable thermoplastic resin granules and the expandable thermoplastic resin thin film.

The pyrolytic foaming agent is not particularly limited as long as it has a decomposition temperature higher than the melting temperature of the thermoplastic resin used. Examples thereof include sodium bicarbonate, ammonium carbonate, ammonium bicarbonate and azide. Compounds, inorganic pyrolytic blowing agents such as sodium borohydride; azodicarbonamide, azobisformamide, azobisisobutyronitrile, barium azodicarboxylate, diazoaminobenzene, N, N'-dinitrosopentamethylenetetramine , P-toluenesulfonyl hydrazide, P, P'-oxybisbenzenesulfonyl hydrazide, trihydrazinotriazine, etc., which are easy to adjust the decomposition temperature and decomposition rate, generate a large amount of gas, and are excellent in hygiene. Amides are preferred.

If the amount of the above-mentioned thermal decomposition type foaming agent is too large, foams are broken and uniform cells are not formed. On the contrary, if the amount is too small, foaming may not be sufficiently performed. It is preferable that the content be contained in a proportion of 1 to 25 parts by weight based on 100 parts by weight of the thermoplastic resin.

(Other components that can be added) In order to increase the strength of the thermoplastic resin foam, the thermoplastic resin used for the foamable thermoplastic resin granules and the foamable thermoplastic resin thin film is required to have the following properties. Accordingly, reinforcing materials such as short glass fibers, short carbon fibers, and short polyester fibers; calcium carbonate,
A filler such as aluminum hydroxide and glass powder may be added.

In addition, when the above-mentioned filler is added, if the amount of addition is large, the cells are broken at the time of foaming, and a foam having a high expansion ratio cannot be obtained. If the amount is small, the obtained foam is reinforced. Effect may not be obtained sufficiently. Therefore, the amount of the filler is preferably 100 parts by weight or less, more preferably 5 parts by weight, based on 100 parts by weight of the thermoplastic resin.
0 parts by weight or less.

(Expandable Thermoplastic Resin Sheet) The expandable thermoplastic resin sheet is formed by arranging foamable thermoplastic resin particles substantially uniformly in a plane, and the foamable thermoplastic resin particles described above. Are integrally connected via a foamable thermoplastic resin thin film. The shape of the expandable thermoplastic resin granules is not particularly limited, and includes, for example, a hexagon, a column, and a sphere, but when the expandable thermoplastic resin granules foam, the foaming is uniformly performed. For making this work, a column shape is most preferable.

When the expandable thermoplastic resin particles are cylindrical, the diameter thereof is not particularly limited because it varies depending on the expansion ratio, thickness, and the like of the target uneven thermoplastic resin foam. If it is too large, the foaming speed will be reduced, and if it is too small, the column will melt and deform due to heating during foaming, it will be easily deformed, and it will not be possible to express primary foaming, and the thickness accuracy and weight accuracy will have large variations. Therefore, when the expandable thermoplastic resin particles are cylindrical, the diameter is preferably 1 to 30 mm, more preferably 2 to 20 mm.

When the expandable thermoplastic resin particles have a columnar shape, the height thereof is not particularly limited because it varies depending on the expansion ratio and thickness of the target thermoplastic resin 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 greatly in the width direction and the longitudinal direction. Therefore, the height of the columnar foamable thermoplastic resin granules is 1 to 3
It is preferably 0 mm, more 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 thermoplastic resin foam, but if the distance is too long. When the expandable thermoplastic resin granules foam, there is a possibility that a large amount of insufficient filling occurs. If the amount is too short, complete filling occurs. Therefore, the center-to-center distance between the expandable thermoplastic resin particles is preferably 2 to 50 mm, more preferably 3 to 30 mm.

In order to improve the thickness accuracy and weight accuracy of the finally obtained thermoplastic resin foam and to make the irregularity shape and the expansion ratio uniform, the foamable thermoplastic resin granules are made of the foamable thermoplastic resin. It is necessary to arrange the sheet-like body substantially uniformly in a plane. However, the mode in which the thermoplastic resin granules are arranged substantially uniformly in a plane is not particularly limited, and may be arranged in a lattice.
They may be arranged in a staggered manner. When the foamable thermoplastic resin granules are arranged in a lattice, the high foaming portions obtained by foaming the individual foamable thermoplastic resin granules have a square pillar shape, and the irregular thermoplastic resin foam is formed. The foamable thermoplastic resin granules are preferably arranged in a lattice shape so that the body has a uniform buffering property and a sufficient compressive strength.

Further, when the expandable thermoplastic resin particles are arranged in a staggered manner, the highly expanded portions obtained by foaming the individual expandable thermoplastic resin particles have a hexagonal column shape. Thus, a pseudo honeycomb structure is formed.
Therefore, the cushioning property of the obtained irregular thermoplastic resin foam becomes uniform, and the compressive strength becomes sufficient. Therefore,
Preferably, the foamable thermoplastic resin granules are arranged in a staggered manner.

The thickness of the foamable thermoplastic resin thin film is not particularly limited since it varies depending on the expansion ratio and thickness of the target thermoplastic resin foam. When the thermoplastic resin particles are moved, the expansion in the width direction and the longitudinal direction increases, and when the particles are too thin, the expandable thermoplastic resin particles cannot be held. Therefore, the thickness of the foamable thermoplastic resin thin film is 0.0
5 to 3 mm is preferable, and more preferably 0.1 to 2 mm
It is.

(Method for Producing Foamable Thermoplastic Resin Sheet) The method for producing the above foamable thermoplastic resin sheet is not particularly limited. For example, 1) foaming thermoplastic resin sheet is used. A thermoplastic resin and a foaming agent to be supplied to an injection molding machine, melt-kneaded at a temperature lower than the decomposition temperature of the pyrolytic foaming agent, and a mold having a concave portion corresponding to the shape of the foamable thermoplastic resin granule. 2) The thermoplastic resin and foaming agent constituting the foamable thermoplastic resin sheet are supplied to an extruder, and the temperature is lower than the decomposition temperature of the pyrolytic foaming agent. After melt-kneading at a 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 a large number of recesses are uniformly arranged on at least one outer peripheral surface. Is Introduced into the pair of shaping rolls rotating in different directions, after press-fitting the part of the sheet-shaped foamable thermoplastic resin softened state into the recess, cooling method for releasing being most preferred.

The method 2) will be described in more detail.
First, in order to obtain a sheet-shaped foamable thermoplastic resin in a softened state, a method of melt-kneading and extruding the foamable thermoplastic resin with an extruder or a method of melting using a calender roll is usually used. The melting used is most preferable from the viewpoint of continuous weight accuracy and quantitativeness.

The form of the foamable thermoplastic resin in the softened state is as follows:
The form is not particularly limited as long as it can be continuously formed, and includes a sheet form, a large number of strand forms, and the like. The sheet form is most preferable from the viewpoint of quantitativeness in the direction perpendicular to the flow (width direction).

The recesses on the outer peripheral surface of the shaping roll are preferably arranged substantially uniformly in order to improve the weight accuracy and thickness accuracy of the foamable thermoplastic resin sheet obtained.
The arrangement of the concave portions on the outer peripheral surface of the shaping roll is not particularly limited as long as it is uniform over the entire outer peripheral surface of the shaping roll, but since it is more uniform, it is most preferably arranged in a lattice or staggered manner. .

The shape of the concave portion on the outer peripheral surface of the shaping roll is not particularly limited, and examples thereof include a hexagonal shape, a columnar shape, a spherical shape, and the like. The column shape is most preferable because the body can be easily molded uniformly and the mold can be easily released after cooling.

When the shape of the concave portion on the outer peripheral surface of the shaping roll is cylindrical, the diameter of the cylindrical column is not particularly limited because it varies depending on the shape of the target foamable thermoplastic resin sheet, but is too large. And the mold release after cooling is difficult to perform, the foamable thermoplastic resin thin film is broken, and if it is too small, the foamable thermoplastic resin granules are broken at the time of mold release after cooling.
30 mm is preferred, and more preferably 2 mm to 20 mm
It is.

When the shape of the concave portion on the outer peripheral surface of the shaping roll is cylindrical, the height of the column is not particularly limited because it varies depending on the shape of the target foamable thermoplastic resin sheet. If too low, the mold release after cooling is difficult to perform, the foamable thermoplastic resin thin film is broken, and if it is too low, a foamable thermoplastic resin sheet that can perform one-dimensional foaming cannot be formed,
1 mm to 30 mm is preferable, and more preferably 2 mm to
20 mm.

The clearance of the shaping roll must be smaller than the thickness of the softened sheet-like foamable thermoplastic resin. Therefore, if it is in this range, it is not particularly limited because it changes depending on the shape of the target foamable thermoplastic resin sheet, but if it is too thick, a foamable thermoplastic resin sheet that can perform one-dimensional foaming is formed. When the thickness is too small, the foamable thermoplastic resin thin film is easily broken at the time of release after cooling. Therefore, the thickness is preferably 0.05 mm to 3 mm, and more preferably 0.1 mm to 2 mm.

The method of press-fitting a part of the softened sheet-like foamable thermoplastic resin into the concave portion is performed by changing the clearance of the pair of shaping rolls into the softened sheet-like foamable thermoplastic resin. This is achieved by applying pressure from a shaping roll.

The method of cooling the partially foamed thermoplastic resin sheet in a softened state that has been press-fitted is not particularly limited as long as it can be lowered to the melting point of the foamable thermoplastic resin or lower. There is a method such as flowing cooling water inside.

[Non-absorbent layer] The non-absorbent layer used in the floor structure according to any one of claims 1 to 11 is not particularly limited as long as it is a material capable of imparting cushioning properties to the floor structure. Alternatively, a nonwoven fabric, a foam sheet, or the like may be used, and a plurality of these may be laminated.

Examples of the woven or non-woven fabric laminated for improving the buffering property include inorganic fibers such as glass fibers and carbon fibers, and organic fibers such as polypropylene, polyester, nylon and aramid.

If the woven or nonwoven fabric is too thick, the sink of the floor structure becomes large, and if it is too thin, effects such as cushioning, vibration damping and sound insulation cannot be exhibited.
000 g / m @ 2, more preferably 50 to 80 g / m @ 2.
0 g / m2, more preferably 80 to 500 g / m2.
It is.

Examples of the foamed sheet laminated for improving the buffering property include resins such as polyethylene, polypropylene, polyethylene vinyl acetate, polyvinyl chloride, unsaturated polyester, and urethane, and copolymers thereof. .

If the foamed sheet is too thick, the sink of the floor structure becomes large, and if it is too thin, the effects of cushioning, vibration damping and sound insulation cannot be exhibited.
Is preferably, more preferably, 500 μm to 5 mm, and still more preferably, 1 to 3 mm. [Wood board]

The wood board used for the floor structure according to any one of claims 1 to 11 is not particularly limited as long as it is a wood material capable of securing the strength as the floor structure. For example, it may be wood veneer, plywood, particle board, or the like. Medium-density fiberboard (MDF), high-density fiberboard (HDF), hardboard, parallel plywood (LVL) and the like.

The thickness of the wooden board is preferably 3 to 30 mm, more preferably 5 to 20 mm, because if it is too thin, the bending stiffness is reduced and the strength is insufficient, and if it is too thick, it will not be compatible with surrounding fittings. Preferably 10 to 15 mm
It is.

[Resin Foam] The resin foam used for the floor structure according to any one of claims 2 to 7 and claims 8 to 11 is not particularly limited as long as the strength as the floor structure can be ensured. For example, olefin resin (polyethylene resin, polypropylene resin, etc.), polystyrene resin,
Thermoplastic resins such as polyethylene vinyl acetate resins and vinyl chloride resins; thermosetting resins such as unsaturated polyester resins and urethane resins; and foams made of copolymers thereof. Among them, a polystyrene resin foam is preferable from the viewpoint of strength and water resistance stability. In addition,
The resin used for the resin foam may be the same as the resin used for the thermoplastic resin foam.

If the expansion ratio of the resin foam is too low, the weight of the floor structure cannot be reduced, and if it is too high, the strength of the floor structure is insufficient. It is 3 to 40 times, more preferably 5 to 30 times.

If the thickness of the resin foam is too small, the bending rigidity is reduced and the strength is insufficient. If the thickness is too large, the resin foam cannot be balanced with the surrounding fittings.
More preferably 15 to 50 mm, still more preferably 15
４０40 mm.

(Other Laminated Materials) The floor structure according to any one of claims 1 to 11, may be a hard plate / a non-absorbent layer / wood board / resin foam, or a hard plate / thermoplastic resin. The foam / non-absorbent layer / wooden board / resin foam is laminated in this order. However, in order to improve cushioning, vibration damping, sound insulation, etc. Between layers, or between a rigid plate and a thermoplastic resin foam, or between a thermoplastic resin foam and a non-absorbent absorbent layer, or between a non-absorbent absorbent layer and a wooden board, furthermore, a resin sheet, woven or non-woven fabric, or a foam sheet And the like may be singly or plurally laminated.

Examples of the resin sheet include thermoplastic resins such as polyethylene, polypropylene, polyethylene vinyl acetate, and polyvinyl chloride, and resin sheets of copolymers thereof; and thermosetting resins such as unsaturated polyester, urethane, and epoxy. And a resin sheet of vulcanized or non-vulcanized rubber such as isoprene rubber, butadiene rubber, styrene butadiene rubber, butyl rubber, nitrile rubber, and ethylene-propylene rubber.
The resin sheet also includes a composite resin sheet in which the resin is filled with an inorganic material, an organic material, or a metal material.

If the resin sheet is too thin, the improvement in cushioning, vibration damping, and sound insulation properties will be small, and if it is too thick, the sink of the floor structure will be large, so it is preferably 30 μm to 10 mm, more preferably 50 μm. ５5 mm, more preferably 100 μm〜3 mm.

Examples of the above-mentioned woven or non-woven fabric include inorganic fibers such as glass fibers and carbon fibers; and organic fibers such as polypropylene, polyester, nylon and aramid.

If the woven fabric or nonwoven fabric is too thin, the improvement in cushioning, vibration damping and sound insulation properties will be small, and if it is too thick, the sinking of the floor structure will increase.
g / m2, more preferably 50 to 800 g / m2.
m2, more preferably 80 to 500 g / m2.

Examples of the foamed sheet include resins such as polyethylene, polypropylene, polyethylene vinyl acetate, polyvinyl chloride, unsaturated polyester, and urethane, and copolymers thereof.

When the foamed sheet is too thick, the sink of the floor structure becomes large, and when the foamed sheet is too thin, the effects of cushioning, vibration damping and sound insulation cannot be exhibited.
Is preferably, more preferably, 500 μm to 5 mm, and still more preferably, 1 to 3 mm.

[Method of Manufacturing Floor Structure] The method of manufacturing a floor structure according to any one of claims 1 to 11, comprises the steps of:
The wood board / resin foam, or the hard board / thermoplastic resin foam / non-woven absorbent layer / wood board / resin foam may be sequentially laminated in this order or in the reverse order. When laminating in this order, they are laminated in advance in a factory or the like, and directly adhered to a rough floor at a construction site. When the layers are laminated in the reverse order, the layers may be laminated in advance in a factory or the like, or a resin foam may be adhered on a rough floor at a construction site and laminated sequentially. On the other hand, a hard plate and a non-woven absorbent layer, or a hard plate, a thermoplastic resin foam and a non-woven absorbent layer are laminated in advance as a floor material, and on the other hand, a wooden board and a resin foam are grounded. A board may be laminated in advance, a base board may be stuck on a rough floor at a construction site, and finally a floor material may be stuck. These may be appropriately selected depending on the weight of the floor structure and its components and the working environment of the construction site.

A hard plate and a non-absorbent layer, or a hard plate, a thermoplastic resin foam and a non-absorbent layer are used as floor materials.
Wood board and resin foam are pre-laminated as base boards, respectively, and the base board is laid on a rough floor at the construction site, and finally the floor material is adhered, so that the entire structure is pre-laminated and the site construction is completed. The workability is improved as compared with the case of performing. In this case, as described above, it is preferable to divide between the non-absorbent layer and the wooden board because the non-absorbent layer and the follow-up operation can be easily performed. Furthermore, the renovation from the existing tatami mat to the floor material is completed only by installing the base board and the floor material, so that the workability is excellent.

As a method of laminating the above-mentioned hard plate and thermoplastic resin foam, there is a laminating method using an adhesive or a pressure-sensitive adhesive. Examples of the adhesive used include a vinyl acetate-based adhesive, a vinyl ester-based adhesive, and a chloroprene-based adhesive, and examples of the adhesive include an acrylic adhesive.

It is also preferable that at least one surface of the thermoplastic resin foam be subjected to a corona treatment or a primer treatment in order to improve adhesion and tackiness.

As described above, the base board is formed by laminating a wood board on a resin foam. If the thickness of the base board is too thin, the bending rigidity is reduced and the strength is insufficient, and if it is too thick, it cannot be taken with surrounding fittings.
100 mm is preferred, and more preferably 20 to 80 m
m, more preferably 30 to 50 mm.

If the size of the base board is too large, it is difficult to handle the work at the time of construction, and the workability is deteriorated. It is preferably from 500 to 3000 mm, more preferably from 800 to 2000 mm.

As a method of laminating the wooden board and the resin foam, there is a laminating method using an adhesive or an adhesive. Examples of the adhesive used include a vinyl acetate-based adhesive, a vinyl ester-based adhesive, and a chloroprene-based adhesive, and examples of the adhesive include an acrylic adhesive.

In order to improve the adhesiveness and tackiness, it is also preferable that at least one surface of the resin foam is subjected to a corona treatment or a primer treatment.

[Laminating method of flooring material and foundation board] When the flooring material and the foundation board are manufactured separately, and then the foundation board is laid on the rough floor and the flooring material is finally adhered, As a method of laminating the base board and the base board, a laminating method using an adhesive or a pressure-sensitive adhesive can be cited. Examples of the adhesive used include vinyl acetate-based adhesives, vinyl ester-based adhesives, chloroprene-based adhesives, urethane-based adhesives, epoxy-based adhesives, and the like. Claim 5 or Claim 6 or Claim 10 Alternatively, the laminating method using the double-sided tape according to claim 11 is preferable from the viewpoint of workability.

[0129] Claims 5 and 6, or claim 10
And the double-sided tape used in claim 11 is 1)
Resin film or resin foam made of polyethylene, polypropylene, polyethylene vinyl acetate, polyvinyl chloride, polyester, etc., 2) polyethylene,
Of woven or non-woven fabric made of organic fibers such as polypropylene, polyethylene vinyl acetate, polyester, etc.
Acrylic adhesive consisting of polyacrylic acid ester polymer on both sides, vinyl adhesive consisting of vinyl ether copolymer, rubber adhesive consisting of natural rubber, synthetic rubber, etc. Can be

[0130] Claims 5 and 6, or claim 10
If the thickness of the double-sided tape used in claim 11 is too thin, the unevenness of the base may not be absorbed, and if it is too thick, the walking feeling of the floor structure is deteriorated, so that the thickness is preferably 0.1 to 3 mm. Preferably it is 0.2 to 1 mm.

[0131] The double-sided tape may be laminated with other materials as necessary. In particular, a double-sided tape in which a resin net is laminated on one side is more preferable because it can give a slip when the floor material is constructed.

In the floor structure according to the sixth aspect, the ratio at which the floor material and the floor base board are partially laminated via the double-sided tape is not particularly limited. Since it cannot be sufficiently adhered to the board, it is preferably 10 to 80% of the floor material construction area, more preferably 20%.
５０50%.

When the above-mentioned partial lamination is performed, it is preferable that the lamination portion coincides with the joining portion of the floor material, particularly the joining portion of the long side, since the warpage of the floor material can be suppressed.

[Construction method of floor structure] The floor structure according to any one of the first to eleventh aspects may be fixed directly to the foundation itself such as a concrete floor with adhesive, adhesive, nails or the like. As described in the above, the resin foam of the base board may be directly laid and fixed on the rough floor on which the plywood, particle board, cedar board and the like are laid on the joist or the support.

[Action]

[0135] The floor structure according to the first aspect is such that a hard plate-shaped body / absorbent layer / wooden board / resin foam is laminated in this order from the upper side. In the remodeling, since the wooden board and the resin foam are laminated under the non-woven absorbent layer, the structure has a soundproof property and an excellent workability.

The floor structure according to claim 2 is, from the top, a hard plate-like body / a thermoplastic resin foam / an uneven absorbent layer / a wooden board /
Since the resin foams are laminated in this order, the soundproof performance is excellent and the walking feeling is excellent, and further, since the wooden board and the resin foam are laminated under the non-woven absorbent layer, It becomes a configuration excellent in workability in renovating from etc.

[0137] The floor structure according to claim 3, wherein the thermoplastic resin foam is a sheet-like continuous foam layer, a plurality of high foam portions disposed on the back surface of the continuous foam layer, and the high foam portion. It consists of a low-foaming thin film covering the entire surface together with the continuous foaming layer, and the high foaming portion is formed in a convex shape from the continuous foaming layer,
By forming a concave between adjacent high foaming parts,
Since irregularities are formed on the back surface of the thermoplastic resin foam, it is easily deformed when an impact is applied to the floor structure because the rigidity does not increase despite having a high compression modulus. Therefore, even if the buffer layer is thin, the impact action time can be extended, and even if the amount of compressive deformation is small, high soundproofing can be achieved. In addition, since the continuous foam layer connects the individual high foams, breakage during walking or heavy load is unlikely to occur. Therefore, the "seasickness phenomenon" at the time of walking can be eliminated, and the flooring material is excellent in soundproofing performance and has a good walking feeling.

The floor structure according to a fourth aspect of the present invention is the floor structure according to the third aspect, wherein the surface of the continuous foam layer in contact with each of the high foaming portions is formed in a concave shape. The contact between the body and the thermoplastic resin foam becomes partial, making it difficult for the vibration of the hard plate-like body to propagate to the thermoplastic resin foam, and the sound insulation is further improved by the vibration attenuation occurring in the space formed by the concave portion It will be.

[0139] The floor structure according to claim 5 is the same as that of claims 1-4.
In the floor structure described above, the non-absorbent layer and the wooden board are laminated via double-sided tape, and the construction is simple, and the reform is easy, and the adhesive or the like at the time of construction is used. Dirt can be prevented.

The floor structure according to the sixth aspect is the first to fourth aspects.
In the floor structure described, the non-absorbent layer and the wooden board are partially laminated via a double-sided tape, and the construction is simple, and the reform is easy, and
Dirt due to an adhesive or the like at the time of construction can be prevented, construction member costs can be reduced, and construction time can be further reduced.

The floor structure according to the seventh aspect is the first to sixth aspects.
In the floor structure described, the lower surface of the resin foam is laid directly on the rough floor, and after removing the existing tatami mat,
It is only necessary to fix the lower surface of the resin foam directly to the rough floor with glue, adhesive, nails, etc., it is easy to remodel from tatami to floor material, shortening the construction time, reducing the construction labor, noise during construction Is reduced.

[0142]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to embodiments and drawings. Example 1 Thermoplastic resin foam high-density polyethylene (trade name “HY34” manufactured by Mitsubishi Chemical Corporation)
0, MI = 1.5 g / 10 min) 50% by weight, silane-grafted polypropylene (manufactured by Mitsubishi Chemical Corporation, product number “XPM8”)
00H ", MI = 11 g / 10 min, gel fraction after crosslinking 8
0% by weight) 20% by weight, polypropylene (manufactured by Mitsubishi Chemical Corporation, product number "MA3", melt index (MI) = 1)
1 g / 10 min) 30% by weight of thermoplastic resin 100
A composition containing 4 parts by weight, 4 parts by weight of azodicarbonamide (manufactured by Otsuka Chemical Co., Ltd., product number “SO-20”, decomposition temperature 210 ° C.) and 0.1 part by weight of dibutyltin dilaurate as a silane crosslinking catalyst was prepared as shown in FIG. Was supplied to the twin-screw extruder 11 shown in FIG.

The twin-screw extruder 11 used had a diameter of 44 mm. In the twin screw extruder 11, the above composition was
Melt and kneaded at 80 ° C, surface length 500mm, lip 1.0m
The sheet-like foamable thermoplastic resin in the softened state was extruded by the T die 12 of m.

Further, a cylindrical recess 1 having a depth of about 10 mm, a diameter of 4 mm, and a pitch of 10.1 mm between adjacent recesses is used.
3a shapes the uncrosslinked foamable thermoplastic resin sheet between rolls 13 and 14 (clearance 0.2 mm) having a diameter of 250 mm and a surface length of 500 mm, which are arranged in a zigzag only on the shaping roll 13. While cooling, the foamable thermoplastic sheet was immersed in water at 98 ° C. for 2 hours and then dried to obtain a columnar foamable thermoplastic resin granule 6 having a measured height of 5.7 mm and a diameter of 4 mm. A staggered expandable thermoplastic resin sheet 5 was obtained on the expandable thermoplastic resin thin film 7 (0.2 mm thick).

In the foamable thermoplastic resin sheet 5 obtained as described above, the foamable thermoplastic resin granules 6 are connected by the foamable thermoplastic resin thin film 7, and as a whole, the foamable thermoplastic resin sheet is formed. Form 5 was constituted.

The obtained foamable thermoplastic resin sheet 5
Was cut into 300 × 900 mm, and as shown in FIG. 3 (a), it was arranged on a polyfluoroethylene sheet 15 (arranged weight: 1000 g / m 2), and further, a polyfluoroethylene sheet 16 was arranged on its upper surface. By hand pressing, the foam was heated and foamed at 210 ° C. for 10 minutes so that the gap between the polyfluoroethylene sheets 15 and 16 was 8 mm. As shown in FIG. 3 (b), first, the temperature of the foamable thermoplastic resin thin film 7 rises first, so that the foamable thermoplastic resin sheet 5 foams and gradually forms irregularities. Then
As shown in FIGS. 3 (c) to 3 (d), the expandable thermoplastic resin granules 6 start foaming, and FIGS.
As shown in (e), the foamable thermoplastic resin thin film 7 forms the continuous foam layer 3 and enters between the foamable thermoplastic resin granules 6 to form the low foamable thin film 4, and the foamable thermoplastic resin The granular material 6 forms the high foaming portion 2, and the continuous foaming layer 3 of the sheet body, the high foaming portions 2 arranged on at least one side of the continuous foaming layer, and the surface of the high foaming portion are formed by the continuous foaming layer. A flat thermoplastic resin foam 1 composed of a low-foaming thin film 4 to be coated together and each of the high-foaming portions was heat-sealed through the low-foaming thin film 4 was obtained.

Next, after shaving off the convex portion 3a of the continuous foam layer 3 of the obtained thermoplastic resin foam 1, the film was cooled by a cooling press at 30 ° C. for 10 minutes, and the foaming ratio shown in FIG. A thermoplastic resin foam of 8 mm and a filling rate of 100% was obtained.

The expansion ratio, thickness and filling factor of the obtained thermoplastic resin foam were measured by the following methods and are shown in Table 1.

(Thickness of Foam) Using a caliper, the thickness of the obtained thermoplastic resin foam was measured. (Expansion ratio) The expansion ratio was measured in accordance with JIS K6767. (Filling rate of foam) [arrangement weight (g / m2) x expansion ratio] / (thickness of foam x 1
000) × 100.

Preparation of Flooring Material A 0.3 mm-thick veneer (trade name “White Oak”, manufactured by Kitasansha) was bonded to a Lauan plywood with an aqueous vinyl urethane resin (manufactured by Koyo Sangyo Co., Ltd., product number “KR120”). A hard plate having a thickness of 4.0 mm was obtained. Then, as shown in FIG. 5, on the one surface of the thermoplastic resin foam 1 adjusted to a thickness of 8 mm, the obtained hard plate-like body 22 was coated with a vinyl acetate-based adhesive (manufactured by Sekisui Chemical Co., Ltd., product number “ # 5660 ”), and a nonwoven absorbent layer 23 made of a polyurethane foam (foaming ratio: 40 times, 2.5 mm) was further adhesively laminated on the other surface, filling rate: 100% by volume, thickness: 14. A 5 mm flat floor material 21 was obtained.

Fabrication of Base Board As shown in FIG. 6, a 30 mm thick wood board 32 made of 12 mm Lauan plywood was applied to a wooden board 32 using a vinyl acetate adhesive (trade name “Shinko Bond 246” manufactured by Oshika Shinko Co., Ltd.). A resin foam 33 made of polystyrene foam (trade name “Eslenfoam SR” manufactured by Sekisui Plastics Co., Ltd.) is adhered to the base board 31 of 900 × 1820 × 42 mm shown in FIG.
Was prepared.

Preparation of Floor Construct As shown in FIG. 7, a rough floor 51 (area; 3640 mm × 2730 m) installed on a slab 52 (110 mm thick)
m, joist; 45 mm × 35 mm, 450 mm pitch: rough board; 12 mm thick Rawan plywood), a 42 mm thick base board 31 is installed, and a urethane-based adhesive (trade name “manufactured by Sekisui Chemical Co., Ltd .; Esdine U-750) 4
1 was applied at 500 g / m 2 and the floor material 21 was adhered and laminated to produce a floor structure.

Example 2 Using the same foamable thermoplastic resin sheet as in Example 1, an irregular thermoplastic resin foam was prepared.
A thermoplastic resin foam was obtained by foaming in the same manner as in Example 1 except that the gap between the polyfluoroethylene sheets 15 and 16 was 10 mm.

This thermoplastic resin foam comprises a sheet-like continuous foam layer 3, a plurality of high foam portions 2 arranged on one side of the continuous foam layer 3, and a surface of the high foam portion 2 formed by the continuous foam layer. 3
The high foamed portion 2 is formed in a convex shape with respect to the continuous foamed layer 3, and the surface side of the continuous foamed layer in contact with each high foamed portion 2 is formed in a concave shape. However, a portion corresponding to the convex portion of the continuous foamed layer was cut into a smooth shape to obtain an uneven thermoplastic resin foam having a foaming ratio of 8 times, a thickness of 8 mm, a filling factor of 80% by volume, and a thickness of 14.5 mm.

The expansion ratio, thickness and filling factor of the obtained thermoplastic resin foam were measured in the same manner as in Example 1.

Further, in the same manner as in Example 1, the hard plate member 22 and the non-woven absorbent layer 23 were bonded and laminated on a thermoplastic resin foam to obtain a floor member 21 shown in FIG.

Using the floor material 21 obtained, a floor structure was produced in the same manner as in Example 1.

Example 3 The actually measured height of the foamable thermoplastic resin sheet 5 was 4.2 m.
A foamable thermoplastic resin sheet 5 was obtained in the same manner as in Example 1 except that m was changed to m.

In the foamable thermoplastic resin sheet 5 obtained as described above, the foamable thermoplastic resin granules 6 are connected by the foamable thermoplastic resin thin film 7, and as a whole, the foamable thermoplastic resin sheet Form 5 was constituted.

The foamable thermoplastic resin sheet 5 thus obtained
Was foamed in the same manner as in Example 1 to obtain a thermoplastic resin foam.

[0161] The obtained thermoplastic resin foam comprises a sheet-shaped continuous foamed layer 3, a plurality of high foamed portions 2 arranged on one side of the continuous foamed layer 3, and the surface of the high foamed portion 2 as described above. It comprises a low-foaming thin film 4 covering with the foaming layer 3, and the high-foaming portion 2 is formed in a convex shape with respect to the continuous foaming layer 3, and the surface side of the continuous foaming layer in contact with each high-foaming portion 2 is concave It was a foamed irregular thermoplastic resin foam having a foaming ratio of 8 times, a thickness of 8 mm, a filling factor of 80% by volume, and a thickness of 14.5 mm.

The expansion ratio, foam thickness and filling factor of the obtained thermoplastic resin foam were measured in the same manner as in Example 1.

Further, in the same manner as in Example 1, the hard plate-like body 22 and the non-woven absorbent layer 23 were bonded and laminated on a thermoplastic resin foam to obtain a floor material 21 shown in FIG.

Using the floor material 21 obtained, a floor structure was produced in the same manner as in Example 1.

Example 4 A base board similar to that of Example 1 was placed on the same rough floor as that of Example 1, and a double-sided tape 42 (manufactured by Sekisui Chemical Co., Ltd., product name “double tack tape # 530”) was used. The floor material obtained in Example 3 was laminated on the entire surface to produce a floor structure shown in FIG.

Example 5 A base board similar to that of Example 1 was placed on the same rough floor as that of Example 1, and a double-faced tape 42 having a width of 50 mm (a double tack tape # 530 manufactured by Sekisui Chemical Co., Ltd.) was used. The flooring material obtained in Example 3 was laminated at an area ratio of 35% for both the lamination ratio of the non-woven absorbent layer 23 and the double-sided tape 42 and the lamination ratio of the double-sided tape 42 and the wooden board 32, and FIG. The indicated floor structure was made. The lamination ratio was calculated by the following method and is shown in Table 1.

(Lamination ratio) (Attached area of double-sided tape 42) / (Total non-absorbent absorbent layer 23)
Area or area of all wooden boards 32) × 100

Example 6 Preparation of Flooring Material A 0.3 mm-thick veneer (trade name “White Oak”, manufactured by Kita-Sansha Co., Ltd.) was coated on the surface of a rawan plywood with an aqueous vinyl urethane resin (manufactured by Koyo Sangyo Co., Ltd., product number “KR120”). ") To obtain a hard plate having a thickness of 12.0 mm. A polyurethane foam (foaming ratio: 40 times, 2.5 mm) was formed on the back surface of the obtained rigid plate-like rawan plywood using a vinyl acetate adhesive (manufactured by Sekisui Chemical Co., Ltd., product number "# 5660"). The land absorption layer 23 was bonded and laminated to obtain a flat flooring material 21 having a filling rate of 100% by volume and a thickness of 14.5 mm.

A base board having a thickness of 42 mm was prepared in the same manner as in Example 1, and the base board was slab (110 mm thick).
Rough floor (area: 3640 mm x 2730)
mm, joist; 45 mm x 35 mm, 450 mm pitch:
A rough board; 12 mm thick Rawan plywood), and a urethane adhesive (trade name "Esdine U-750", manufactured by Sekisui Chemical Co., Ltd.) 41 g is applied on the base board at a rate of 500 g / m2, and the floor material is bonded and laminated. Thus, a floor structure was produced.

Example 7 A base board having a thickness of 42 mm was prepared in the same manner as in Example 6, and the base board was set on a rough floor similar to that in Example 6, and a double-sided tape 42 (product name, manufactured by Sekisui Chemical Co., Ltd.) Using a "double tack tape # 530"), the hard plate-like body obtained in Example 6 was entirely laminated to produce a floor structure.

Comparative Example 1 Preparation of Floor Material A 0.3 mm-thick veneer (trade name “White Oak”, manufactured by Kitasan Co., Ltd.) was coated on one side of Rawan plywood with an aqueous vinyl urethane resin (manufactured by Koyo Sangyo, product number “KR120”). ") To obtain a hard plate having a thickness of 12 mm. A polyurethane foam (foaming ratio: 40 times, 2.5 mm thickness) was formed on the other surface of the obtained hard plate-like rawan plywood using a vinyl acetate adhesive (product plate “# 5660” manufactured by Sekisui Chemical Co., Ltd.). ) Was bonded and laminated to obtain a floor material.

Preparation of Base Board Using the above-mentioned three 12 mm thick Rawan plywood and one 6 mm thick Rawan plywood, they were laminated with a vinyl acetate-based adhesive (trade name “Shinko Bond 246”, manufactured by Oshika Shinko Co., Ltd.).
A base board of 0 × 1820 × 42 mm was prepared.

Preparation of Floor Structure Next, a base board was set on a rough floor similar to that in Example 1, and
A urethane-based adhesive (trade name “Esdine U-750” manufactured by Sekisui Chemical Co., Ltd.) was applied at 500 g / m 2, and the floor material was bonded and laminated to prepare a floor structure.

Comparative Example 2 Fabrication of Flooring Material A 0.3 mm thick veneer (trade name “White Oak”, manufactured by Kitasan Co., Ltd.) was coated on one side of Rawan plywood with an aqueous vinyl urethane resin (manufactured by Koyo Sangyo, product number “KR120”). ") To obtain a hard plate having a thickness of 14.5 mm.

Preparation of Floor Structure A base board was prepared in the same manner as in Example 1, and the base board was placed on a rough floor similar to that in Example 1, and a urethane-based adhesive (trade name “Sekisui Chemical Co., Ltd.,” Esdine U-750 ")
Was applied at a rate of 500 g / m 2, and the floor material was bonded and laminated to produce a floor structure.

Comparative Example 3 A floor structure was produced in the same manner as in Comparative Example 1, except that the same flooring as that in Example 3 was used.

Comparative Example 4 A polystyrene foam having a thickness of 30 mm (trade name “Eslenfoam SR” manufactured by Sekisui Plastics Co., Ltd.) was placed on a rough floor.
A 12 mm Lauan plywood was bonded to the polystyrene foam using a vinyl acetate adhesive (trade name “Shinko Bond 246” manufactured by Oshika Shinko Co., Ltd.). Then, a urethane-based adhesive (trade name "Esdine U-750", manufactured by Sekisui Chemical Co., Ltd.) is applied on the Rawan plywood at a rate of 500 g / m2, and is made of a polyurethane foam (foaming ratio: 40 times, 2.5 mm thick). Adhered the non-layer. Finally, the same hard plate-shaped body as in Comparative Example 1 was bonded and laminated using a vinyl acetate-based adhesive (manufactured by Sekisui Chemical Co., Ltd., product number “# 5660”) to produce a floor structure.

The floor structures obtained in Examples 1 to 7 and Comparative Examples 1 to 3 were subjected to the following evaluations, and the results are shown in Tables 1 and 2.

Evaluation of Floor Constructing Amount of Subsidence A steel cylinder indenter with a diameter of 50 mm was placed at the center of the surface of the constructed floor constructing body, and the amount of submersion when a compressive load of 80 kg was applied at a speed of 10 kg / min was measured. did.

Soundproof performance The lightweight floor impact noise level was measured according to JIS A1418.

Construction time The construction time of the whole process of installing the floor structure on the rough floor was measured.

Reformability The peeling time when the floor material was peeled from the prepared floor structure was measured.

Appearance of Appearance The appearance of the produced floor structure on the surface of the hard plate was visually evaluated.

[0184]

[Table 1]

[0185]

[Table 2]

[0186]

According to the first aspect of the present invention, since the floor structure is configured as described above, the floor structure has soundproofness and excellent workability.

The floor structure according to claim 2 is configured as described above, so that the floor structure is excellent in soundproofing and workability.

[0188] Since the floor structure of the third aspect is configured as described above, the floor structure is excellent in soundproof performance and has a good walking feeling.

The floor structure according to claim 4 is configured as described above, so that the soundproofing property is further improved.

Since the floor structure according to claim 5 is configured as described above, workability is improved, dirt during adhesion can be prevented, and re-reform is easy.

The floor structure according to claim 6 is configured as described above, so that the workability is further improved.

According to the floor structure of the seventh aspect, since the floor structure of the first to sixth aspects is directly laid on the rough floor after the removal of the tatami, the reform of the floor material from the tatami can be simplified, and at the time of construction. Noise is also reduced.

[Brief description of the drawings]

FIG. 1 is a process diagram illustrating an example of a method for producing a foamable thermoplastic resin sheet that can be used in the present invention according to claims 2 to 7 or 9 to 11;

FIG. 2 is a plan view of a foamable thermoplastic resin sheet that can be used in the present invention according to claims 2 to 7 or 9 to 11;

FIG. 3 is a cross-sectional view for explaining an example of a method for producing a thermoplastic resin foam used in the present invention according to claims 2 to 7 or 9 to 11;

FIG. 4 is a sectional view showing a thermoplastic resin foam obtained according to Example 1.

FIG. 5 is a cross-sectional view showing a floor material obtained according to Example 1.

FIG. 6 is a cross-sectional view showing a base board obtained according to the first embodiment.

FIG. 7 is a cross-sectional view of a floor structure and a rough floor obtained according to Example 1.

FIG. 8 is a cross-sectional view showing a floor material obtained in Example 2.

FIG. 9 is a cross-sectional view showing a floor material obtained in Example 3.

FIG. 10 is a cross-sectional view of a floor structure and a rough floor obtained in Example 4.

FIG. 11 is a sectional view of a floor structure and a rough floor obtained according to Example 5.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermoplastic resin foam 2 High foaming part 3 Continuous foaming layer 3a Convex part 4 Low foaming thin film 5 Foaming thermoplastic resin sheet 6 Foaming thermoplastic resin granule 7 Foaming thermoplastic resin thin film 11 Twin screw extruder Reference Signs List 12 T die 13, 14 Forming roll 15, 16 Polyfluorinated ethylene sheet 21 Floor material 22 Hard plate 23 Non-land layer 31 Base board 32 Wood board 33 Resin foam 41 Adhesive 42 Double-sided tape 51 Rough floor 52 Slab

Claims (11)

[Claims] 1. A floor structure comprising: a hard plate / a non-woven absorbent layer / a wood board / a resin foam laminated in this order from the upper side. 2. A floor structure comprising: a hard plate / thermoplastic resin foam / non-absorbent absorbent layer / wood board / resin foam laminated in this order from the upper side. 3. A foamed thermoplastic resin comprising a sheet-shaped continuous foam layer, a plurality of high foam portions disposed on the back surface of the continuous foam layer, and a continuous foam layer formed on the entire surface of the high foam portion. Along with the low foamed thin film to be coated, the high foamed portion is formed in a convex shape from the continuous foamed layer, and between adjacent high foamed portions is formed in a concave shape, so that irregularities are formed on the thermoplastic resin foam back surface. The floor structure according to claim 2, wherein the floor structure is formed. 4. The floor structure according to claim 3, wherein the surface of the continuous foam layer in contact with each of the high foaming portions is formed in a concave shape. 5. The structure according to claim 1, wherein the non-woven absorbent layer and the wooden board are laminated via a double-sided tape.
The floor structure according to any one of the above. 6. The floor structure according to claim 1, wherein the non-woven absorbent layer and the wooden board are partially laminated with a double-sided tape interposed therebetween. 7. The floor structure according to claim 1, wherein a lower surface of the resin foam is laid directly on a rough floor. 8. A base board in which a wood board is laminated on a resin foam, and a floor material in which a non-absorbent layer is laminated on a lower surface of a hard plate-like body. And a method of constructing a floor structure substantially the same as that described above, wherein a resin foam surface of the base board is laid on the rough floor, and the non-absorbent layer of the floor material is fixed on a wooden board surface of the base board. A method for constructing a floor structure, comprising: 9. A base board in which a wooden board is laminated on a resin foam, and a floor material in which a hard plate / thermoplastic foam / non-absorbent layer is laminated in this order from the upper side. A method of constructing a floor structure having substantially the same overall thickness as a tatami mat, wherein a resin foam surface of the base board is laid on the rough floor, and the floor material is placed on a wooden board surface of the base board. A method for constructing a floor structure, comprising fixing a non-land absorbent layer of the present invention. 10. The floor structure according to claim 8, wherein a non-absorbent layer of a floor material is adhered to a wooden board surface of the base board via a double-sided tape. Construction method. 11. The floor structure according to claim 10, wherein the double-sided tape to be attached to the wooden board surface of the base board is disposed only at the peripheral portion of the construction area and the longitudinal joint of the floor material. Construction method.