JP2013113022A - Flooring material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flooring material that hardly generates toxic gas in the case of firing, can prevent the occurrence of valley warp, is excellent in workability, can prevent the occurrence of swelling, and can prevent the occurrence of push-up after construction.SOLUTION: A flooring material 1 has a surface resin layer 2 integrally laminated on an upper surface side of an intermediate resin layer 3 and a rear surface resin layer 4 integrally laminated on a lower surface side of the intermediate resin layer 3. The surface resin layer 2, the intermediate resin layer 3, and the rear surface resin layer 4 are such resin layers that only resins without chlorine atoms in a chemical structure as a resin component are substantially used. The surface resin layer 2 is formed by laminating a surface resin sheet with its linear expansion coefficient being 10.0×10/K or lower on the upper surface side of the intermediate resin layer 3. The rear surface resin layer 4 is formed by laminating a rear surface resin sheet with its linear expansion coefficient being 10.0×10/K or lower on the lower surface side of the intermediate resin layer 3. A thickness of the surface resin layer and a thickness of the rear surface resin layer are 0.03 mm to 1.0 mm, respectively. The rear surface resin layer has the thickness 1.0 to 4.0 times that of the surface resin layer.

Description

  The present invention relates to a flooring material suitably used as a flooring material for buildings such as buildings, condominiums, houses, and commercial facilities, or a flooring material for vehicles such as railways and buses.

  In the present specification, the term “polypropylene-based resin” is used in a meaning that does not include an elastomer (that is, a polypropylene-based elastomer).

  In this specification, the term “resin sheet” is used to mean “resin film”.

  Moreover, in this specification, the term "linear expansion coefficient" means the linear expansion coefficient measured on 30-60 degreeC conditions using the thermomechanical measuring apparatus (TMA) based on JISK7197-1991. To do.

  Conventionally, floor materials for buildings such as buildings, condominiums, houses, commercial facilities, or floor materials for vehicles such as railways and buses (tile floor materials, sheet-like floor materials) are made of vinyl chloride resin (PVC). Many things were adopted.

  However, because PVC flooring generates harmful gases along with a large amount of smoke during combustion, there are problems with disaster prevention such as evacuees inhaling harmful gases during a fire, and incineration disposal treatment. There was a problem of causing environmental pollution. In addition, since PVC flooring contains a large amount of plasticizer, there is a peculiar odor, and the long-term use of the plasticizer volatilizes to reduce the flexibility as a flooring. There is also a problem in that the appearance of the plasticizer tends to be fogged on the surface due to the use, and the appearance is poor.

  Therefore, in recent years, it has been proposed to use the following materials, which generate less harmful gases during combustion, instead of PVC materials as constituent materials for flooring. For example, polypropylene resin, polyethylene resin, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-based copolymer such as ethylene-vinyl acetate copolymer, olefin-based thermoplastic resin such as polybutene-1, polymethyl methacrylate, polymethyl methacrylate and acrylic It has been proposed to use acrylic thermoplastic resins such as copolymers with rubber, polyurethane thermoplastic resins, olefin thermoplastic elastomers, styrene thermoplastic elastomers, urethane thermoplastic elastomers, etc. as constituents of flooring materials. (See Patent Documents 1 and 2). By using these resins as the constituent material of the flooring, the problem of generation of harmful gases during combustion, the peculiar odor caused by the plasticizer, and the problem of clouding are almost solved.

JP 2002-145942 A JP 2002-105874 A

  However, in the latter prior art, the floor warping phenomenon of the flooring (a state in which the edge side warps upward with respect to the central portion) cannot be sufficiently prevented, and therefore, the workability is inferior. In the latter prior art, there is a concern that the flooring may be swollen, and a push-up phenomenon is likely to occur after construction.

  The present invention has been made in view of such a technical background, and it is difficult to generate harmful gas during combustion, can sufficiently prevent the occurrence of valley warp, has excellent workability, and can suppress the occurrence of swelling. And it aims at providing the flooring which can also prevent the pushing-up generation | occurrence | production after construction.

  In order to achieve the above object, the present invention provides the following means.

[1] A flooring material in which a surface resin layer is laminated and integrated on an upper surface side of an intermediate resin layer, and a back surface resin layer is laminated and integrated on a lower surface side of the intermediate resin layer,
The surface resin layer, the intermediate resin layer, and the back resin layer are resin layers in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component,
The surface resin layer is obtained by laminating a surface resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the upper surface side of the intermediate resin layer,
The back resin layer is obtained by laminating a back resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the lower surface side of the intermediate resin layer,
The thickness of the surface resin layer is 0.03 mm to 1.0 mm, the thickness of the back surface resin layer is 0.03 mm to 1.0 mm, and the thickness of the back surface resin layer is the thickness of the surface resin layer. A flooring material having a thickness in the range of 1.0 to 4.0 times the thickness.

  [2] The flooring according to the above item 1, wherein the surface resin layer and the back surface resin layer are made of an amorphous polyester resin as a main component of the resin component.

[3] The intermediate resin layer includes a glass base fabric layer, an upper intermediate resin layer stacked on the upper surface side of the glass base fabric layer, and a lower intermediate resin layer stacked on the lower surface side of the glass base fabric layer. And including
1 or 2 above, wherein the upper intermediate resin layer and the lower intermediate resin layer are resin layers in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component. The flooring described in 1.

  [4] The flooring according to the above item 3, wherein the upper intermediate resin layer and the lower intermediate resin layer use polypropylene elastomer and polypropylene resin as resin components.

  [5] In any one of the above items 1 to 4, wherein a printed layer is formed on the lower surface of the surface resin layer, and a primer coating layer containing a carboxylic acid-modified polyolefin resin is formed on the lower surface of the printed layer. The flooring described.

In the invention of [1], the front surface resin layer, the intermediate resin layer, and the back surface resin layer are resin layers in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component. There is little generation of harmful gas at the time, it is excellent in combustion safety, is convenient in terms of disaster prevention, and can fully contribute to environmental conservation. Further, the surface resin layer is obtained by laminating a surface resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the upper surface side of the intermediate resin layer, and the back surface resin layer has a linear expansion coefficient. Since a back surface resin sheet of 10.0 × 10 ⁻⁵ / K or less is laminated on the lower surface side of the intermediate resin layer, it is possible to sufficiently prevent the occurrence of valley warp and excellent workability, and also swell Generation | occurrence | production can be suppressed and the pushing-up generation | occurrence | production after construction can also be prevented.

  Furthermore, since the thickness of the surface resin layer is 0.03 mm to 1.0 mm and the thickness of the back surface resin layer is 0.03 mm to 1.0 mm, the dimensional stability of the flooring can be improved, and the floor The flexibility as a material can be further improved and the workability can be further improved.

  In addition, since the thickness of the back surface resin layer is 1.0 to 4.0 times the thickness of the surface resin layer, generation of valley warp can be more sufficiently prevented.

In the invention of [2], since the surface resin layer and the back surface resin layer are composed of an amorphous polyester resin as a main component of the resin component, the linear expansion coefficients of the surface resin sheet and the back surface resin sheet are determined. Each can be made smaller within a range of 10.0 × 10 ⁻⁵ / K or less, thereby preventing the warp generation more sufficiently, further improving the workability, and sufficiently suppressing the occurrence of swelling. It is possible to prevent the occurrence of push-up after construction.

  The term “main component” means a component having a ratio of 50% by mass to 100% by mass with respect to the total mass of the resin components. When the resin component is only one component, the one component is referred to as “main component”.

  In the invention [3], since the glass base fabric layer is laminated between the upper intermediate resin layer and the lower intermediate resin layer, the dimensional stability of the flooring can be improved.

  In the invention of [4], since the upper intermediate resin layer and the lower intermediate resin layer use polypropylene elastomer and polypropylene resin as the resin component, the flexibility as a flooring material can be improved. Workability can be further improved, and sufficient hardness that does not cause cracking even when the flooring is bent can be imparted.

  In the invention of [5], since the primer coating layer containing the carboxylic acid-modified polyolefin resin is formed on the lower surface of the printing layer formed on the lower surface of the surface resin layer, the surface on which the printing layer is provided on the back surface Adhesiveness between the resin layer and the intermediate resin layer can be sufficiently improved, and a flooring excellent in durability is provided.

It is sectional drawing which shows one Embodiment of the flooring which concerns on this invention.

An embodiment of a flooring according to the present invention will be described with reference to the drawings. As shown in FIG. 1, in the flooring 1 of the present embodiment, the surface resin layer 2 is laminated and integrated on the upper surface side of the intermediate resin layer 3, and the back surface resin layer 4 is laminated and integrated on the lower surface side of the intermediate resin layer 3. The surface resin layer 2, the intermediate resin layer 3 and the back resin layer 4 are all made of only a resin having no chlorine atom in the chemical structure as a resin component. The surface resin layer 2 is a resin layer formed by laminating a surface resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the upper surface side of the intermediate resin layer 3. The back resin layer 4 has a configuration in which a back resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less is laminated on the lower surface side of the intermediate resin layer 3.

  Further, in the present embodiment, the intermediate resin layer 3 is laminated on the glass base fabric layer 12, the upper intermediate resin layer 11 laminated on the upper surface of the glass base fabric layer 12, and the lower surface of the glass base fabric layer 12. The lower intermediate resin layer 13. The upper intermediate resin layer 11 and the lower intermediate resin layer 13 are resin layers in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component.

  The intermediate resin layer 3 is a resin layer in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component. The intermediate resin layer 3 may be composed of a single layer or a plurality of layers.

  Among them, the intermediate resin layer 3 includes a glass base fabric layer 12, an upper intermediate resin layer 11 laminated on the upper surface side of the glass base fabric layer 12, and a lower layer laminated on the lower surface side of the glass base fabric layer 12. The side intermediate resin layer 13 is preferably included.

  At this time, the thickness of the upper intermediate resin layer 11 / the thickness of the lower intermediate resin layer 13 is preferably set in a range of 1.0 / 1.0 to 1.0 / 3.0. In this case, the generation of valley warp of the flooring 1 can be more sufficiently prevented.

  The resin component constituting the intermediate resin layer 3 (upper intermediate resin layer 11, lower intermediate resin layer 13 and the like) is not particularly limited, and examples thereof include polypropylene elastomers, polypropylene resins, and polyethylene elastomers. And polyethylene resins. Among these, as the resin component constituting the intermediate resin layer 3 (the upper intermediate resin layer 11, the lower intermediate resin layer 13, etc.), it is preferable to use a polypropylene-based elastomer and a polypropylene-based resin.

  In the intermediate resin layer 3 (upper intermediate resin layer 11, lower intermediate resin layer 13, etc.), the blending mass ratio of the polypropylene elastomer to the polypropylene resin is polypropylene elastomer / polypropylene resin = 55/5 to 25/35. It is preferable to set in the range. By setting in such a range, the flexibility as a flooring material can be improved and the workability can be further improved, and sufficient hardness that does not cause cracking even when the flooring material is bent can be imparted. it can. Especially, it is especially preferable to set the blending mass ratio of the polypropylene-based elastomer and the polypropylene-based resin within the range of polypropylene-based elastomer / polypropylene-based resin = 50/10 to 35/25.

  The polypropylene resin is not particularly limited, and examples thereof include an ethylene-propylene copolymer resin and a homopolypropylene resin (a homopolymer of propylene).

  The intermediate resin layer 3 (upper intermediate resin layer 11, lower intermediate resin layer 13 and the like) may be blended with a filler (for example, calcium carbonate) and other additives.

  Although it does not specifically limit as the glass base fabric layer 12 which comprises a part of said intermediate resin layer 3, For example, a glass nonwoven fabric, a glass woven fabric, etc. are mentioned. Among these, it is preferable to use a glass nonwoven fabric. In this case, the upper intermediate resin layer 11 and the lower intermediate resin layer 13 can easily impregnate the glass base fabric layer (glass nonwoven fabric layer) 12 to further improve the delamination strength. Can do.

The basis weight of the glass base fabric layer 12 is preferably set to ^{20g / m 2 ~200g / m 2} . Thermal dimensional stability can be improved by setting it to 20 g / m ² or more, and adhesion test (based on peel adhesion strength according to JIS A5536 5.3.3) by setting it to 200 g / m ² or less. It is possible to prevent the material destruction of the glass base fabric layer 12 from occurring. Above all, the basis weight of said glass base fabric layer 12 is more preferably set to ^{50g / m 2 ~120g / m 2} .

The surface resin layer 2 is a resin layer in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component. The surface resin layer 2 is obtained by laminating a surface resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the upper surface side of the intermediate resin layer 3. The surface resin layer 2 may be composed of a single layer or a plurality of layers. The resin having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less for forming the surface resin layer 2 is not particularly limited. For example, the linear expansion coefficient is 10.0 × 10 × Examples thereof include amorphous polyester resins of 10 ⁻⁵ / K or less. Therefore, the surface resin layer 2 preferably has a configuration in which an amorphous polyester resin is used as a main component of the resin component. The surface resin layer 2 is more preferably configured such that 80% by mass or more and 100% by mass or less of the resin component is an amorphous polyester resin. Examples of the amorphous polyester resin include amorphous polyethylene terephthalate (linear expansion coefficient is 7.2 × 10 ⁻⁵ / K; “PETG” manufactured by Riken Technos). Among them, the surface resin layer 2 is preferably a surface resin sheet having a linear expansion coefficient of 8.0 × 10 ⁻⁵ / K or less laminated on the upper surface side of the intermediate resin layer 3.

  The thickness of the surface resin layer 2 is set to 0.03 mm to 1.0 mm. Especially, it is preferable that the thickness of the surface resin layer 2 is set to 0.05 mm to 0.5 mm.

  A printed layer may be laminated on the lower surface of the surface resin layer 2. In this case, it is preferable that a primer coating layer is formed on the lower surface of the printing layer. By forming such a primer coating layer, the adhesive strength between the surface resin layer 2 and the intermediate resin layer 3 can be improved. The primer coating layer is preferably a primer coating layer containing a carboxylic acid-modified polyolefin resin. The printing layer can be formed by, for example, an inkjet method, a gravure printing method, a screen printing method, a transfer printing method, or the like.

The back resin layer 4 is a resin layer in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component. In addition, the back surface resin layer 4 is obtained by laminating a back surface resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the lower surface side of the intermediate resin layer 3. The said back surface resin layer 4 may be comprised by the single layer, and may be formed by the multiple layer. The resin having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less for forming the back surface resin layer 4 is not particularly limited. For example, the linear expansion coefficient is 10.0 × 10 × Examples thereof include amorphous polyester resins of 10 ⁻⁵ / K or less. Therefore, the back surface resin layer 4 preferably has a configuration in which an amorphous polyester resin is used as a main component of the resin component. As for the said back surface resin layer 4, the structure whose 80 to 100 mass% of a resin component is an amorphous polyester resin is more preferable. Examples of the amorphous polyester resin include amorphous polyethylene terephthalate (linear expansion coefficient is 7.2 × 10 ⁻⁵ / K; “PETG” manufactured by Riken Technos). Especially, it is preferable that the back surface resin layer 4 has a back surface resin sheet having a linear expansion coefficient of 8.0 × 10 ⁻⁵ / K or less laminated on the lower surface side of the intermediate resin layer 3.

  The thickness of the back surface resin layer 4 is set to 0.03 mm to 1.0 mm. Especially, it is preferable that the thickness of the said back surface resin layer 4 is set to 0.05 mm-0.5 mm.

  A primer coating layer is preferably formed on the upper surface of the back surface resin layer 4. By forming such a primer coating layer, the adhesive strength between the back surface resin layer 4 and the intermediate resin layer 3 can be improved. The primer coating layer on the upper surface of the back surface resin layer 4 is preferably a primer coating layer containing a carboxylic acid-modified polyolefin resin.

  A primer coating layer is preferably formed on the lower surface of the back surface resin layer 4. Thereby, adhesiveness with the adhesive agent apply | coated to the installation object surface at the time of construction can be improved. The primer coating layer on the lower surface of the back surface resin layer 4 is preferably a primer coating layer containing a carboxylic acid-modified polyolefin resin.

  In the present invention, the thickness of the back surface resin layer 4 is set in a range of 1.0 to 4.0 times the thickness of the surface resin layer 2. By setting to such a range, generation | occurrence | production of the valley warp of a flooring can be prevented more fully. Especially, it is preferable that the thickness of the said back surface resin layer 4 is the range of 1.5 times-3.0 times the thickness of the said surface resin layer 2. FIG.

  For each of the front surface resin layer 2, the intermediate resin layer 3, and the back surface resin layer 4, various kinds of antioxidants, ultraviolet absorbers, lubricants, heat stabilizers, light stabilizers, flame retardants, colorants, antistatic agents, etc. You may make it contain an additive suitably.

  The thickness of the flooring 1 of the present invention is not particularly limited, but is preferably set to 1.0 mm to 4.0 mm.

  The flooring 1 of the present invention may be configured as a tile-shaped flooring or a sheet-like flooring (for example, a long sheet having a width of about 600 to 2500 mm), and is not particularly limited.

  The method for producing the flooring according to the present invention is not particularly limited, and for example, it is produced by laminating using a known laminating technique such as a known machine such as a calendering machine or an extruder or a hot laminating machine. can do. Further, the stacking order is not particularly limited.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

<Example 1>
A resin composition comprising 45 parts by mass of a polypropylene-based elastomer, 15 parts by mass of a polypropylene-based resin, and 40 parts by mass of calcium carbonate was kneaded with a Banbury mixer, and the upper intermediate sheet (upper Resin layer 11) and a lower intermediate sheet having a thickness of 0.9 mm (lower intermediate resin layer 13) were prepared.

In addition, as the surface resin sheet (surface resin layer 2), an amorphous polyethylene terephthalate resin film (“PETG” manufactured by Riken Technos) having a linear expansion coefficient of 7.2 × 10 ⁻⁵ / K and a thickness of 0.1 mm is prepared. Then, an amorphous polyethylene terephthalate resin film (“PETG” manufactured by Riken Technos) having a linear expansion coefficient of 7.2 × 10 ⁻⁵ / K and a thickness of 0.2 mm is prepared as the back surface resin sheet (back surface resin layer 4). did. In addition, gravure printing was performed on the back surface of the front surface resin sheet to form a printing layer, and a primer solution containing a carboxylic acid-modified polyolefin resin was applied to the printing layer to form a primer coating layer.

From the lower side, the back side resin sheet, the lower side intermediate sheet, the glass nonwoven fabric (weight per unit: 60 g / m ² ), the upper side intermediate sheet and the surface resin sheet (arrangement where the printing layer and primer coating layer are on the lower side) are stacked in this order. The flooring 1 having a thickness of 2.0 mm shown in FIG. 1 was obtained by compression molding using a hot press machine at 150 ° C. and 1.0 MPa for 5 minutes.

<Example 2>
The thickness of the back surface resin layer was set to 0.3 mm, and the thickness of the back surface resin layer / the thickness of the front surface resin layer was set to 3.0 as in Example 1 except that the thickness was set to 2.1 mm. A flooring was obtained.

<Example 3>
The thickness of the back surface resin layer was set to 0.15 mm, and the thickness of the back surface resin layer / the thickness of the front surface resin layer was set to 1.5. A flooring was obtained.

<Example 4>
As a resin composition constituting the upper intermediate resin layer and the lower intermediate resin layer, a resin composition obtained by blending 35 parts by mass of a polypropylene elastomer, 25 parts by mass of a polypropylene resin and 40 parts by mass of calcium carbonate was used. Except for this, a flooring material having a thickness of 2.0 mm was obtained in the same manner as in Example 1.

<Example 5>
As a resin composition constituting the upper intermediate resin layer and the lower intermediate resin layer, a resin composition obtained by blending 15 parts by mass of a polypropylene elastomer, 45 parts by mass of a polypropylene resin and 40 parts by mass of calcium carbonate was used. Except for this, a flooring material having a thickness of 2.0 mm was obtained in the same manner as in Example 1.

<Example 6>
As a surface resin sheet, an olefin resin film having a linear expansion coefficient of 9.1 × 10 ⁻⁵ / K and a thickness of 0.1 mm (35 parts by mass of olefin resin, 60 parts by mass of metal hydroxide salt, layered silicate) An olefin resin film having a linear expansion coefficient of 9.1 × 10 ⁻⁵ / K and a thickness of 0.2 mm (35 mass of olefin resin) is used as the back resin sheet. A flooring material having a thickness of 2.0 mm was obtained in the same manner as in Example 1, except that a resin composition film comprising 5 parts by mass, metal hydroxide salt and 5 parts by mass of layered silicate was used.

<Comparative Example 1>
As a surface resin sheet, an olefin resin film having a linear expansion coefficient of 10.9 × 10 ⁻⁵ / K and a thickness of 0.1 mm (50 parts by mass of olefin resin, 45 parts by mass of metal hydroxide salt, layered silicate) An olefin resin film having a linear expansion coefficient of 10.9 × 10 ⁻⁵ / K and a thickness of 0.2 mm (50 mass of olefin resin) is used as the back resin sheet. A flooring material having a thickness of 2.0 mm was obtained in the same manner as in Example 1, except that a resin composition film consisting of 5 parts by mass, metal hydroxide salt and 5 parts by mass of layered silicate was used.

<Comparative example 2>
As a surface resin sheet, an olefin resin film having a linear expansion coefficient of 9.1 × 10 ⁻⁵ / K and a thickness of 0.1 mm (35 parts by mass of olefin resin, 60 parts by mass of metal hydroxide salt, layered silicate) An olefin resin film having a linear expansion coefficient of 10.9 × 10 ⁻⁵ / K and a thickness of 0.2 mm (50 mass of olefin resin) is used as the back resin sheet. A flooring material having a thickness of 2.0 mm was obtained in the same manner as in Example 1, except that a resin composition film consisting of 5 parts by mass, metal hydroxide salt and 5 parts by mass of layered silicate was used.

<Comparative Example 3>
A flooring material having a thickness of 1.7 mm was obtained in the same manner as in Example 1 except that the thickness of the front surface resin layer was set to 0.01 mm and the thickness of the back surface resin layer was set to 0.02 mm.

<Comparative example 4>
Example except that the thickness of the surface resin layer was set to 0.06 mm, the thickness of the back surface resin layer was set to 0.6 mm, and the thickness of the back surface resin layer / the thickness of the surface resin layer was set to 10.0 In the same manner as in Example 1, a 2.3 mm thick flooring was obtained.

<Comparative Example 5>
Example except that the thickness of the surface resin layer was set to 0.2 mm, the thickness of the back surface resin layer was set to 0.1 mm, and the thickness of the back surface resin layer / the thickness of the surface resin layer was set to 0.5 In the same manner as in No. 1, a flooring material having a thickness of 2.0 mm was obtained.

<Comparative Example 6>
A flooring having a thickness of 4.0 mm was obtained in the same manner as in Example 1 except that the thickness of the front surface resin layer was set to 1.2 mm and the thickness of the back surface resin layer was set to 1.2 mm.

  In addition, the linear expansion coefficient of a surface resin sheet and the linear expansion coefficient of a back surface resin sheet are the linear expansion coefficients (1 / K) measured by the following linear expansion coefficient measuring method.

<Linear expansion coefficient measurement method>
Using a thermal stress analyzer (TMA) “EXSTAR TMA / SS6000” manufactured by Seiko Instruments Inc., in accordance with JIS K7197-1991, the linear expansion coefficient (1 / K) of each sheet (surface resin sheet, back surface resin sheet) ). When measuring the linear expansion coefficient, the linear expansion amount is measured under the conditions of 30 ° C. to 60 ° C., and the linear expansion coefficient is measured based on the measurement data of the linear expansion amount in the range of 30 ° C. to 60 ° C. An average value (average value of linear expansion coefficient in a measurement temperature range of 30 ° C. to 60 ° C.) is calculated.

  Each flooring obtained as described above was evaluated based on the following evaluation method. The evaluation results are shown in Tables 1 and 2.

<Swelling prevention evaluation method>
A flooring cut out in a square shape of 40 cm × 40 cm in plan view is bonded with an acrylic adhesive on a wood fixing plate having a smooth surface in an atmosphere at 20 ° C., and left for 72 hours in an atmosphere at 20 ° C. After that, the four sides of the flooring were fixed to the fixing plate with metal fittings, and further left in an oven at 60 ° C. for 4 hours. After that, take out the flooring from the oven, visually observe the surface of the flooring, "◎" if there is no blistering at all, it can be judged that there is only a slight blistering, and there is no substantial swelling Is indicated by “◯”, the case where the swelling slightly occurred is indicated by “△”, and the case where the swelling is conspicuous is indicated by “X”.

<Evaluation method for warpage prevention>
Based on the warpage test of JIS A1454-201014, the warpage amount (mm) of the flooring was measured and evaluated based on the following criteria.
(Criteria)
“◯”: warpage amount is −1.0 mm or more and 0.0 mm or less (for example, −0.5 mm)
“Δ”: The amount of warpage exceeds 0.0 mm to 0.5 mm or less. “X”: The amount of warpage exceeds 0.5 mm, or the amount of warpage is less than −1.0 mm (for example, −2.0 mm).

<Evaluation method for workability (hardness)>
The flexural modulus (MPa) of the flooring was measured according to JIS K7171-2008 and evaluated based on the following criteria.
(Criteria)
“◎”: Bending elastic modulus is 500 MPa or less “◯”: Bending elastic modulus is over 500 MPa to 700 MPa or less “X”: Bending elastic modulus is over 700 MPa.

<Push-up prevention evaluation method>
Wood with a smooth surface in an atmosphere of 20 ° C. with 9 floors cut into a square shape of 40 cm × 40 cm in a plan view and arranged horizontally and 3 by 3 in a grid pattern without gaps After adhering on the fixed plate made of acrylic with an acrylic adhesive and leaving it in an atmosphere at 20 ° C. for 72 hours, fix the four sides (four sides as a whole) of the nine arranged flooring materials with metal fittings. And then left in an oven at 60 ° C. for 4 hours. After that, the floor material is taken out from the oven, and “(◎)” indicates that there was no push-up between adjacent floor materials. “◯” indicates that it could be determined that there was no thrust, “Δ” indicates that a slight push-up occurred between adjacent floor materials, and “x” indicates that a push-up occurred contiguously between adjacent floor materials.

  As is clear from the table, the flooring materials of Examples 1 to 6 of the present invention were excellent in all of swelling prevention, warpage prevention, workability, and push-up prevention after construction.

On the other hand, the flooring material of Comparative Examples 1 and 2 in which at least one of the front surface resin sheet and the back surface resin sheet has a linear expansion coefficient exceeding 10.0 × 10 ⁻⁵ / K has the swelling prevention property and the pushup prevention property. It was inferior to any sex. Moreover, the floor material of the comparative example 3 in which the thickness of the surface resin layer and the back surface resin layer deviates from the lower limit of the specified range of the present invention was inferior in both the swelling prevention property and the push-up prevention property. Moreover, the flooring of Comparative Examples 4 and 5 in which the ratio of (thickness of the back surface resin layer / thickness of the surface resin layer) deviated from the specified range of the present invention was inferior in warpage prevention properties. Moreover, the flooring of Comparative Example 6 in which the thicknesses of the front surface resin layer and the back surface resin layer deviate from the upper limit of the specified range of the present invention was insufficient in flexibility and inferior in workability.

  The flooring of the present invention is suitably used, for example, as a flooring for buildings such as buildings, condominiums, houses, and commercial facilities, or a flooring for vehicles such as railways and buses, but is particularly limited to such applications. It is not something.

DESCRIPTION OF SYMBOLS 1 ... Flooring material 2 ... Surface resin layer 3 ... Intermediate resin layer 4 ... Back surface resin layer 11 ... Upper side intermediate resin layer 12 ... Glass base fabric layer 13 ... Lower side intermediate resin layer

Claims (5)

A floor material in which a surface resin layer is laminated and integrated on the upper surface side of the intermediate resin layer, and a back resin layer is laminated and integrated on the lower surface side of the intermediate resin layer,
The surface resin layer, the intermediate resin layer, and the back resin layer are resin layers in which only a resin having no chlorine atom in the chemical structure is substantially used as a resin component,
The surface resin layer is obtained by laminating a surface resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the upper surface side of the intermediate resin layer,
The back resin layer is obtained by laminating a back resin sheet having a linear expansion coefficient of 10.0 × 10 ⁻⁵ / K or less on the lower surface side of the intermediate resin layer,
The thickness of the surface resin layer is 0.03 mm to 1.0 mm, the thickness of the back surface resin layer is 0.03 mm to 1.0 mm, and the thickness of the back surface resin layer is the thickness of the surface resin layer. A flooring material having a thickness in the range of 1.0 to 4.0 times the thickness.   The flooring material according to claim 1, wherein the front surface resin layer and the back surface resin layer use an amorphous polyester resin as a main component of a resin component. The intermediate resin layer includes a glass base fabric layer, an upper intermediate resin layer laminated on the upper surface side of the glass base fabric layer, and a lower intermediate resin layer laminated on the lower surface side of the glass base fabric layer. Including
2. The upper intermediate resin layer and the lower intermediate resin layer are resin layers in which only a resin having no chlorine atom in a chemical structure is substantially used as a resin component. The flooring according to 2.   The floor material according to claim 3, wherein the upper intermediate resin layer and the lower intermediate resin layer are made of polypropylene elastomer and polypropylene resin as resin components.   The printing layer is formed in the lower surface of the said surface resin layer, The primer coating layer containing a carboxylic acid modified polyolefin resin is formed in the lower surface of this printing layer. Flooring.

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