JP5327787B2 - Olefin flooring - Google Patents

Description

The present invention relates to an olefin-based flooring used as a flooring of a building such as a building, a condominium, a house, or a commercial facility, or a flooring of a vehicle such as a railway or a bus.

Conventionally, 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, those made of polyvinyl chloride resin (PVC) are often used. In recent years, flooring has a problem in terms of disaster prevention because it generates toxic gases such as hydrogen chloride along with a large amount of smoke during combustion, and it also causes environmental pollution when incinerated and discarded. Olefin-based flooring materials are increasingly used.

Such a flooring is usually provided with a design such as a pattern, a pattern, or a character by printing or the like. For example, in Patent Document 1, a base material layer made of a polyolefin resin, a printing layer, and a polyolefin resin are used. An olefin-based flooring having a configuration in which each layer of a laminated sheet in which surface layers are laminated in this order is bonded with a reactive hot melt adhesive is known.

Moreover, in patent document 2, it is a flooring which has the laminated structure of two or more layers which have an olefin resin as a main component, Comprising: Wax is uniformly contained in a surface layer and an inorganic filler is used in a back surface layer And rosin are uniformly contained, and the flooring material is disclosed in which the fiber layer is embedded and the fiber layer is exposed on the lower surface of the back surface layer, and has good adhesiveness and dimensional stability, and there is a risk of swelling and peeling. There is no olefinic flooring.

Further, in Patent Document 3, as a flooring material that the inventors previously invented, which improves the dimensional stability of the flooring material and can prevent the occurrence of valley warping, the total thickness of the flooring material is described. A halogen-free flooring in which a glass fiber layer is laminated at a position of 1 to 50% from the surface is described.
JP 2000-229390 A JP-A-9-151595 JP 2004-225387 A

However, in the flooring materials of these Patent Documents 1 and 2, the thermal expansion of the flooring material itself cannot be suppressed by the adhesive strength with the floor in an environment where the temperature changes rapidly, such as a railcar, and is used. While it was swollen and pushed up, or developed peeling, it was not sufficient as a flooring. Furthermore, in the flooring of Patent Document 3, if a fabric made of glass fiber is sandwiched between sheets having high viscosity, the resin is not impregnated into the fabric made of glass fiber, and the effect of suppressing the size may not be exhibited. There are problems that the delamination strength of the constituent layers is weakened, bubbles are generated during processing, and workability is lowered.

The present invention has been made in view of such technical background, and is a flooring that has no problem in terms of disaster prevention and does not cause a problem of environmental pollution even when incinerated and disposed of, and further, temperature changes are severe. An object of the present invention is to provide an olefin-based flooring material that has sufficient adhesive strength with a floor even in an environment, is excellent in dimensional stability, and does not swell or push up.

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

[1] A flooring composed of an olefin-based resin composition, a surface resin layer containing an olefin-based resin, and a printed layer laminated on the lower surface of the surface resin layer, and on the lower surface of the printed layer A base material layer containing an olefin resin is laminated and integrated through an adhesive layer, and the base material layer has a laminated structure of three or more layers, and at least of the laminated structure of three or more layers. One layer is a cloth made of glass fibers impregnated with an olefin resin in advance, the surface resin layer has a tensile elastic modulus of 70 to 700 MPa, and the base material layer has a linear expansion coefficient of 5 × 10 ^−5. Olefinic flooring characterized in that it is not more than × K- ¹ .

[2] The olefin-based resin impregnated in the cloth made of glass fiber in advance has a melting point of 140 ° C. or less, and is 1.0 to 3.0 times the basis weight of the cloth made of glass fiber. 2. The olefin-based flooring according to item 1, wherein the olefin-based flooring is applied.

[3] The olefin flooring according to any one of items 1 to 3, wherein the olefin flooring has a flexural modulus of 200 MPa or less and a residual dent ratio of 8.0% or less. .

[4] A fiber layer is embedded in the lowermost layer of a base material layer having a laminated structure of three or more layers, and at least a part of the fiber layer is exposed on the lowermost surface of the base material layer. The olefin flooring material according to any one of items 1 to 4 above.

In the invention of [1], a flooring material comprising an olefinic resin composition, comprising a surface resin layer containing an olefinic resin, and a printing layer laminated on the lower surface of the surface resin layer, the printing Since the base material layer containing the olefin resin is laminated and integrated on the lower surface of the layer through an adhesive layer, there is no problem in terms of disaster prevention, and the problem of causing environmental pollution even when incinerated and discarded There will be no flooring.

In addition, the base material layer has a laminated structure of three or more layers, and at least one layer of the laminated structure of three or more layers is a fabric made of glass fibers impregnated with an olefin resin in advance. , It becomes possible to limit the linear expansion coefficient of the base material layer to 5 × 10 ⁻⁵ × K ⁻¹ or less, the effect of suppressing the size is sufficiently exhibited, and the delamination strength of the strong constituent layer is obtained, Air bubbles are not generated during processing, and good processability can be obtained.

Furthermore, the tensile elastic modulus of the surface resin layer is set to 70 to 700 MPa, the thermal stress of the surface resin layer is lowered, and the linear expansion coefficient of the base material layer is limited to 5 × 10 ⁻⁵ × K ⁻¹ or less. By ensuring the dimensional stability with respect to the temperature change of the layer, the occurrence of phenomena such as swelling and push-up can be prevented, and an olefin-based flooring material having sufficient adhesive strength with the floor can be obtained.

In the invention of [2], since the olefin-based resin impregnated in advance into the cloth made of glass fiber has a melting point of 140 ° C. or lower, sufficient adhesion to the base material layer is obtained, and the cloth made of the glass fiber By applying an amount of 1.0 to 3.0 times the basis weight of the resin, it becomes possible for the resin to impregnate the core of the fabric made of the glass fiber, and a good dimensional change suppressing effect Is obtained.

In the invention of [3], since the flexural modulus of the olefin-based flooring material is 200 MPa or less and the residual dent rate is 8.0% or less, the workability of the flooring material is good, and wear resistance, heel, etc. It can be set as the olefin type flooring material excellent in residual dent resistance.

In the invention of [4], a fiber layer is embedded in the lowermost layer of the base material layer having a laminate structure of three or more layers, and at least a part of the fiber layer is exposed on the lowermost surface of the lowermost layer of the base material layer. Therefore, the adhesive strength with the floor can be increased by the anchor effect of the fiber layer, and an olefin-based flooring can be obtained which does not have a problem due to insufficient adhesive strength with the floor such as swelling or pushing up during use.

Hereinafter, an embodiment of an olefin flooring (1) according to the present invention will be described with reference to the drawings. In the olefin flooring (1) of the present embodiment, the printing layer (4) is laminated on the lower surface of the surface resin layer (2) containing the olefin resin, and the lower surface of the printing layer (4). The base material layer (3) containing an olefin resin is laminated and integrated through an adhesive layer (5), and the base material layer (3) has a laminated structure of three or more layers. The surface resin layer (2) has a laminated structure in which two or more olefin resin sheets (7) and a fabric (6) made of glass fibers impregnated with an olefin resin are laminated and integrated. ) Is set to 70 to 700 MPa, and the linear expansion coefficient of the base material layer (3) is set to 5 × 10 ⁻⁵ × K ⁻¹ or less. . FIG. 1 is an enlarged schematic cross-sectional view showing a part of the olefin-based flooring (1) of the present embodiment.

For example, in the case of a railway vehicle where the temperature changes rapidly, the linear expansion coefficient of the resin flooring material is very large compared to the linear expansion coefficient of the aluminum plate or the like, which is a floor panel. If the resin floor material is to be deformed more than a plate or the like and the periphery of the resin floor material is fixed with metal fittings or the like, thermal stress appears. It is considered that when the thermal stress exceeds the adhesive force between the resin floor material and the floor board or the weight of the resin floor material, the resin floor material swells, and a phenomenon such as swelling or push-up occurs. Thermal stress is approximated by the product of tensile modulus, linear expansion coefficient, and temperature change. To reduce thermal stress, the tensile modulus and linear expansion coefficient of resin flooring are You can lower it.

However, in the flooring of the present invention, when the base material layer (3) is regarded as one layer, the surface resin layer (2), the printing layer (4), the adhesive layer (5), and the base material layer (3) If a material with low tensile modulus and linear expansion coefficient is used for each layer, a flooring material with low thermal stress can be obtained, but the performance as a flooring material cannot be ensured. Of these, limiting the tensile elastic modulus of the surface resin layer to 70 to 700 MPa, and inserting a fabric (6) made of glass fiber impregnated with an olefin resin in advance between the base layer (3). As a result, the linear expansion coefficient of the base material layer (3) is limited to 5 × 10 ⁻⁵ × K ⁻¹ or less, and as a result, the thermal stress of the olefin-based flooring (1) is suppressed, and the phenomenon of swelling and pushing up In addition, it is possible to prevent peeling with sufficient adhesive strength to the floor. The present invention has been confirmed.

In the present invention, the surface resin layer (2) contains an olefin resin. Thus, since the surface resin layer (2) contains the olefin resin, the olefin flooring (1) is excellent in wear resistance and contamination resistance on the surface. However, since the tensile modulus of the surface resin layer is limited to 70 to 700 MPa, examples of the olefin resin include polypropylene, polyethylene, ethylene-vinyl acetate copolymer resin, ethylene-α olefin copolymer resin, and olefin. Although a thermoplastic elastomer etc. are mentioned, it becomes a structure always containing an elastomer resin. The surface resin layer (2) may have a single layer structure or a laminated structure in which a plurality of layers are laminated. For example, the surface layer, the intermediate layer, and the lower layer have a three-layer structure, PP (polypropylene) excellent in wear and chemical resistance performance is disposed on the surface layer and the lower layer, and HSBR (hydrogenated styrene-butadiene-rubber) is used for the intermediate layer. A surface resin layer (2) having a structure can be mentioned. However, the tensile elastic modulus of the surface resin layer (2) is limited to 70 to 700 MPa. If the tensile modulus of the surface resin layer is less than 70 MPa, the surface resin layer becomes flexible and the dent amount increases, which is not preferable. Further, even if the tensile elastic modulus of the surface resin layer exceeds 700 MPa, it is not preferable because the thermal stress that causes swelling is increased. The tensile modulus of elasticity of the surface resin layer is more preferably 100 to 500 MPa.

The thickness of the surface resin layer (2) is not particularly limited, but is preferably set to 100 to 1000 μm. When the thickness is 100 μm or more, sufficient wear resistance is obtained, and when the thickness is 1000 μm or less, generation of valley warp of the olefin-based flooring (1) can be effectively prevented.

Next, the printing layer (4) is laminated on the lower surface of the surface resin layer (2), and is not particularly limited, and is formed by a printing technique such as gravure printing, offset printing, screen printing, transfer printing, and ink jet printing. Is. The printing ink used for this printing is not particularly limited. For example, pigments, dyes, colorants, fillers, etc. are added to and mixed with synthetic resins such as acrylic resins, urethane resins, and polyester resins. Can be exemplified. Usually, those diluted with a solvent or the like are used.

Next, as an adhesive constituting the adhesive layer (5) on the lower surface of the printed layer (4), a carboxylic acid-modified propylene-1-butene copolymer resin and a carboxylic acid-modified propylene-ethylene-1- It contains butene copolymer resin, and the mass ratio of carboxylic acid modified propylene-1-butene copolymer resin / carboxylic acid modified propylene-ethylene-1-butene copolymer resin is in the range of 55/45 to 95/5. An olefin that is preferably used, and the printed layer (4) on the lower surface of the surface resin layer (2) and the base material layer (3) are bonded and integrated with sufficient adhesive strength, and does not peel off between the layers. It becomes a system flooring (1).

As the carboxylic acid-modified propylene-1-butene copolymer resin, a maleic acid-modified propylene-1-butene copolymer resin is preferably used. In this case, the printing layer (4) and the base material layer (3) are used. The adhesive strength can be further improved. The carboxylic acid-modified propylene-ethylene-1-butene copolymer resin is preferably a maleic acid-modified propylene-ethylene-1-butene copolymer resin. In this case, the printing layer (4) and The adhesive strength with the base material layer (3) can be further improved. Examples of the carboxylic acid used for the carboxylic acid modification include acrylic acid, methacrylic acid, fumaric acid, crotonic acid, itaconic acid, citraconic acid, maleic anhydride, citraconic anhydride, phthalic anhydride, and the like. It can be illustrated.

It is preferable that the application amount (weight per unit area) of the adhesive layer (5) is set to 1 to 10 g / m ² (solid content). Sufficient adhesive strength can be ensured by being 1 g / m ² or more, and lightweight can be maintained by being 10 g / m ² or less. Especially, it is especially preferable that the application amount of the adhesive layer (5) is set to ^{2 to} 5 g / m ² (solid content). Moreover, the formation method of the said adhesive bond layer (5) is not specifically limited, For example, the printing method, the dry laminating method, the wet laminating method etc. are mentioned.

The base material layer (3) is a laminated structure of three or more layers in which two or more olefin resin sheets (7) and a fabric (6) made of glass fiber impregnated with an olefin resin are laminated and integrated. Consists of. The olefin resin sheet (7) contains an olefin resin. The olefin-based resin is not particularly limited, and examples thereof include polypropylene, polyethylene, ethylene-vinyl acetate copolymer resin, ethylene-α olefin copolymer resin, and olefin-based thermoplastic elastomer.

The base material layer (3) has a laminated structure of three or more layers, and at least one layer of the laminated structure of three or more layers is a fabric (6) made of glass fiber impregnated with an olefin resin in advance. Are stacked. Glass fiber is a material with particularly little change with respect to heat. By laminating it in the base material layer (3), it is possible to obtain an olefin-based flooring (1) having a further stable behavior against heat and a low linear expansion coefficient. The fabric (6) made of glass fiber is not particularly limited, such as woven fabric, knitted fabric, and non-woven fabric. From the viewpoint of shape and dimensional stability, a nonwoven fabric having a large contact area with the resin layer is preferable, and the shape of the olefin-based flooring (1) can be effectively stabilized. In this respect, the basis weight of the fabric made of glass fiber is preferably in the range of 15 to 60 g / m ^{2. If} the basis weight is lower than this range, the effect of dimensional stability is insufficient, and the high basis weight exceeds this range. Then, delamination between the resin layer and the nonwoven fabric tends to occur, which is not preferable.

The fabric (6) made of laminated glass fibers needs to be impregnated with an olefin resin in advance. By impregnating the olefin-based resin in advance, the resin reaches the core of the fabric (6) made of the laminated glass fibers regardless of the viscosity of the olefin-based resin constituting the base material layer (3). And the linear expansion coefficient of the base material layer (3) can be limited to 5 × 10 ⁻⁵ × K ⁻¹ or less, and the effect of suppressing dimensions and the effect of bonding to the floor are sufficiently exhibited. Is done. If it exceeds 5 × 10 ⁻⁵ × K ⁻¹ , the thermal stress that causes swelling is increased, which is not preferable. More preferably, the linear expansion coefficient of the base material layer (3) is 2 × 10 ⁻⁵ × K ⁻¹ or less, and the basis weight of the fabric (6) made of the laminated glass fibers, or the olefin resin sheet ( The linear expansion coefficient can be adjusted by adjusting the blending amount of the filler filled in 7).

As the olefin resin impregnated in the fabric (6) made of laminated glass fibers, a known olefin resin can be used as long as the melting point is 140 ° C. or lower. Crystalline polymers such as polypropylene and polyethylene that are easy to adjust are preferred. When the impregnated olefin resin has a melting point of 140 ° C. or lower, the olefin resin constituting the base material layer (3) and the fabric (6) made of the laminated glass fibers are laminated. The impregnated olefin resin is melted to obtain a delamination strength of a strong constituent layer, and an integrated olefin flooring (1) is obtained. Also, good laminating workability can be obtained without generating bubbles generated during processing, which is seen when a fabric made of glass fibers not impregnated with resin is inserted. When the melting point of the olefin-based resin exceeds 140 ° C., the adhesion with the olefin-based resin constituting the base material layer (3) is deteriorated, and the integration of the olefin-based flooring (1) is impaired.

In the present invention, the olefin resin impregnated in the fabric (6) made of laminated glass fibers is applied in an amount of 1.0 to 3.0 times the basis weight of the fabric made of glass fibers. It is characterized by that. If it is this application amount, it becomes possible to impregnate even the core part of the fabric (6) made of the glass fiber, and a good dimensional change suppressing effect and a strong adhesion effect to the floor can be obtained. If it is less than 1.0 times, the resin is not impregnated to the core, a good dimensional change suppressing effect is not obtained, and the adhesion with the olefin resin constituting the base material layer (3) is also deteriorated. Moreover, when it exceeds 3.0 times, resin will increase too much and the dimensional change suppression effect will fall.

As another embodiment of the present invention, as shown in FIG. 2, a concealing resin layer (8) can be provided at a position on the surface side of the base material layer (3). Such a concealing resin layer (8) is printed. By arrange | positioning at the back side of a layer (4), the pattern, design, etc. of a printing layer (4) can be visually recognized with sufficient contrast. As the concealing resin layer (8), for example, a concealing resin layer made of a composition in which a color pigment, an antioxidant, and an ultraviolet absorber are mixed with an olefin resin can be exemplified. However, the concealing resin layer (8) is particularly limited to such a configuration. It is not something.

In another embodiment, as shown in FIG. 2, a fiber layer (9) laminated in a state of being impregnated in the base material layer (3) can be mentioned. By exposing at least a part of the fibers of the fiber layer (9) to the back surface of the lowermost layer of the base material layer (3), the bond strength with the floor can be increased by the anchor effect of the fibers. The fiber layer (9) is not particularly limited, such as woven fabric, knitted fabric, non-woven fabric, or fiber type, but a polyester woven fabric is preferably used because of its price and ease of impregnation into the base material layer.

Although the thickness of the said base material layer (3) is not specifically limited, It is preferable to set to 1-5 mm. When it is 1 mm or more, dimensional stability is obtained, and when it is 5 mm or less, the lightness as the olefin-based flooring (1) can be maintained, and good handling properties can be secured.

In addition, any of the surface resin layer (2), the adhesive layer (5), the olefin resin sheet (7), and the olefin resin impregnated in the fabric (6) made of glass fiber may be an antioxidant, Various additives such as an ultraviolet absorber, a lubricant, a stabilizer, a light stabilizer, a flame retardant, a colorant, an antistatic agent, and a filler may be appropriately contained.

The thickness of the olefin flooring (1) of the present invention is not particularly limited, but is usually 2 to 5 mm. Moreover, you may comprise as a tile-like flooring, and you may comprise as a sheet-like flooring (for example, elongate sheet | seat etc. of width about 600-2500 mm), It does not specifically limit.

Moreover, it is preferable that the bending elastic modulus of the olefin type flooring material (1) of the present invention is 200 MPa or less. When the flexural modulus exceeds 200 MPa, the flooring material becomes hard and the workability is lowered, which is not preferable. Furthermore, it is preferable that the residual dent rate of the olefin flooring (1) of the present invention is 8.0% or less. If the residual dent rate exceeds 8.0%, the heel mark can be visually confirmed, which is not preferable. Further, the flexural modulus of the flooring is preferably 150 MPa or less, and the residual dent rate is 6% or less.

The olefin flooring (1) according to the above configuration is manufactured, for example, as follows. First, the printing layer (4) is formed by printing a printing ink containing a synthetic resin on the lower surface of the surface resin layer (2) containing an olefin resin and having a tensile rate of 70 to 700 MPa. . As the printing ink, for example, an ink in which a pigment is added and mixed in a urethane resin is used.

Next, the mass of the carboxylic acid-modified propylene-1-butene copolymer resin / carboxylic acid-modified propylene-ethylene-1-butene copolymer resin is 55/45 to 95/5 on the lower surface of the printing layer (4). An adhesive layer (5) mixed in a specific range is applied. This adhesive layer (5) is usually diluted with an organic solvent such as toluene, methyl ethyl ketone, isopropyl alcohol, ethanol, xylene and applied in a solution state.

On the other hand, an olefin-based resin having a melting point of 140 ° C. or less is discharged by using an extruder in an amount of 1.0 to 3.0 times the basis weight of the fabric made of glass fiber, and the basis weight is 15 Cloth made of glass fiber impregnated with an olefin resin in advance of a resin-integrated linear expansion coefficient of 5 × 10 ⁻⁵ × K ⁻¹ or less by bonding to a cloth made of glass fiber of ˜60 g / m ² ( 6) is obtained.

Furthermore, an olefin resin sheet having a predetermined thickness for forming the base material layer (3) is formed by a calendar molding machine using a composition containing the olefin resin.

Next, the substrate layer (3) is formed on the application surface of the adhesive layer (5) of the surface resin layer (2) on which the printed layer (4) and the adhesive layer (5) are formed on the lower surface. Two layers of an olefin resin sheet having a predetermined thickness and a fabric (6) made of glass fiber impregnated with the olefin resin in advance between the two layers are laminated and bonded as a base layer (3). To obtain a laminate. Usually, it is adhered by heating and pressing.

Thereafter, the laminate is heated and annealed. By applying such an annealing treatment, the strain inherent in the olefin-based flooring (1) can be sufficiently removed. The heating temperature is preferably set to 80 to 120 ° C. The heating time (annealing time) is preferably set to 2 to 48 hours.

The olefin-based flooring (1) according to the present invention is not particularly limited to that manufactured by the above-exemplified manufacturing method.

More specifically, a method for producing an olefin flooring according to the present invention will be described. <Example 1> As shown in Table 1, as the surface resin layer (2), outermost layer / intermediate layer / lowermost layer = polypropylene (PP) resin layer / hydrogenated styrene-butadiene-rubber (HSBR) resin layer / polypropylene (PP) The resin layer has a three-layer structure (each layer has the same thickness), a surface resin layer (2) having a thickness of 600 μm and a tensile modulus of 600 MPa is prepared, and a predetermined pattern is printed on the back surface by gravure printing Then, a printing layer (4) is formed, and an adhesive (maleic acid-modified propylene-1-butene copolymer resin / maleic acid-modified propylene-ethylene-1-butene copolymer resin = 90 / 10) was applied at 3 g / m ² to form an adhesive layer (5).

On the other hand, a composition made of polypropylene having a melting point of 135 ° C. is discharged using an extruder at 80 g / m ² and bonded to a fabric made of glass fiber having a basis weight of 40 g / m ² to impregnate the olefin resin in advance. Fabric (6) made of the prepared glass fiber was formed.

Next, 10 parts by weight of an amorphous propylene-ethylene copolymer (amorphous poly α-olefin resin) having an average molecular weight of 6000 and a styrene-ethylene-butadiene-styrene copolymer resin (SEBS) having a number average molecular weight of 25,000. ) 55 parts by weight, polypropylene 35 parts by weight, calcium carbonate 300 parts by weight, antioxidant (hindered phenol antioxidant) 0.4 part by weight, lubricant (phosphate ester type) 1.2 parts by weight The composition was kneaded with a Banbury mixer, and an olefin resin sheet (7) having a thickness of 1.0 mm was prepared using a calendar molding machine.

Further, the surface resin layer (2) on which the adhesive layer (5) is formed are provided with two olefin-based resin sheets having a thickness of 1.0 mm constituting the base material layer (3), and the two layers between the two layers. A fabric (6) made of glass fiber impregnated with an olefin resin in advance was superposed and adhered as a base material layer (3) to obtain a flooring material having a thickness of 2.4 mm. The flooring material thus obtained had a flexural modulus of 100 MPa and a residual dent rate of 4.0%. A base material layer (3) composed of two layers of an olefin resin sheet having a thickness of 1.0 mm and a fabric (6) made of glass fiber impregnated with the olefin resin in advance between the two layers. ) Was 4 × 10 ⁻⁵ × K ⁻¹ .

<Examples 2 to 5> Except for the conditions such as the composition of each layer shown in Table 1, a flooring was obtained in the same manner as in Example 1, various performance tests were performed, and the evaluation results are shown in Table 3. did. In Examples 4 and 5, the concealing layer is laminated on the upper surface of the base material layer. In Examples 2 to 5, as the fiber layer, cold chill (polyester woven fabric, basis weight 40 g / m ² ) was impregnated and laminated on the base material layer, and at least a part of the fiber was exposed on the bottom surface of the base material layer. It was made the composition which increased the adhesive strength with the floor.

<Comparative example 1> As a base material layer (3), without inserting a fabric (6) made of glass fiber impregnated with an olefin resin in advance, only two layers of an olefin resin sheet having a thickness of 1.0 mm are used. And a flooring was obtained in the same manner as in Example 1 except that the linear expansion coefficient of the base material layer (3) was 7 × 10 ⁻⁵ × K ⁻¹ . Various performance tests were conducted and the results are shown in Table 3.

<Comparative Examples 2 to 7> Except for the composition, thickness and other conditions of each layer shown in Table 2, a flooring was obtained in the same manner as in Example 1, various performance tests were performed, and the evaluation results are shown. 3.

As can be seen from Tables 1 to 3, the flooring materials of Examples 1 to 5 in the specified ranges of the tensile modulus and the linear expansion coefficient of the surface resin layer are swell prevention, abrasion resistance, stain resistance, and dimensional stability. And workability were excellent. On the other hand, in Comparative Examples 1, 2, and 4, which exceeded the specified range of the tensile elastic modulus, there was a problem in the swelling prevention property, and the bending elastic modulus was also large. Further, in Comparative Examples 3 and 5 that were below the specified range of the tensile modulus, the residual dent rate could not satisfy the standard. In Comparative Examples 6 and 7, good dimensional stability was not obtained. In addition, the method of the various performance tests with respect to each flooring obtained as mentioned above was performed as follows.

<Measurement method of tensile modulus> Measured according to JISK6251. The pulling speed was 100 mm / min.

<Method for measuring flexural modulus> Measured according to JISK7171. The test speed was 1.0 mm / min.

<Method of measuring linear expansion coefficient> A sample cut into a 10 cm square size was set in a TMA (thermomechanical analyzer) and measured by raising the temperature from 25 ° C to 80 ° C (5 ° C / min).

<Residual dent rate measuring method> Measured according to JIS A 1454. Those having a residual dent ratio of 3% or less were evaluated as “」 ”, those having 3-8% as“ ◯ ”, and those exceeding 8% as“ X ”.

<Swelling prevention test> A sample cut into a 40 cm square size was bonded to a smooth aluminum plate with a rubber adhesive (in an atmosphere of 23 ° C), and the four sides of the sample were fixed with metal fittings and allowed to stand for 24 hours. 50 ° C. and 60 ° C. were heated in order for 2 hours, and those that did not swell after 6 hours were indicated as “◎”, and those that swelled were indicated as “x”.

<Abrasion resistance test> In accordance with the friction test method for building materials and building components according to JIS A1453, use a wear ring in which a predetermined abrasive paper is wound around the surface of each flooring, and rotate 1000 times with a taper wear tester. The weight loss (g) was measured. Those with a weight loss of 0.25 g or less were rated as “◎”, those with 0.25 to 0.30 g were rated as “◯”, and those exceeding 0.30 g were marked as “x”.

<Contamination resistance test> In accordance with the contamination test of vinyl flooring according to JIS A5705, 2 mL of contamination material is dropped on the surface of each flooring, left to stand for 24 hours, and washed with water containing a neutral detergent. Further, after washing with alcohol, wiped off with gauze, allowed to stand for 1 hour, and visually observed changes in color, gloss and swelling of the dripping part. Those that did not change by observation were marked “◎”, and those that changed at least one were marked “x”.

<Dimensional stability test> According to the length change test by heating of vinyl-based flooring according to JIS A5705, each flooring was heated at 80 ° C for 6 hours, then left indoors for 1 hour, and length before heating. The rate of change with respect to was measured. Those with a rate of change in length of less than 1.0% were marked with “◎”, those with 1.0-1.5% were marked with “◯”, and those with a length change rate exceeding 1.5% were marked with “x”.

<Workability test> Excellent flexibility and construction workability, and the familiarity with the groundwork (construction floor) is “◎”, which is flexible and has good workability and familiarity with the groundwork. Good ones were marked with “◯”, and those with poor flexibility, poor workability, and poor familiarity with the ground were given “x”.

Furthermore, the flooring material of Example 1 was subjected to an NBS combustion test and a flameproof test (vehicle material combustion test). These results are shown in Table 4.

The NBS combustion test method is a method in which a sample is placed vertically in a closed smoke box, and burner flame is applied to the smoke generated in the smoke box while radiant heat is applied from the heater in front of the sample. On the other hand, the light transmittance is measured by a phototube, and the smoke density (Ds) is calculated from the light transmittance (T) based on the following calculation formula.

Ds = 132 log (100 / T) A Ds value and a maximum Ds value of 4 minutes after the start of the test were determined. Further, the gas in the smoke box was collected in a Teflon (registered trademark) bag, and the generated gas was analyzed.

As can be seen from Table 4, it was confirmed that the flooring of the present invention has low fuming property and hardly generates toxic gas.

Not only for vehicles, but also for buildings such as buildings, condominiums, houses, commercial facilities, etc., it can be sufficiently used as a flooring material used in an environment where the temperature changes rapidly.

It is explanatory drawing which shows the flooring which concerns on one Embodiment of this invention. It is explanatory drawing which shows the base-material layer part of the flooring which concerns on another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Olefin type flooring material 2 Surface resin layer 3 Base material layer 4 Printing layer 5 Adhesive layer 6 Fabric which consists of glass fiber impregnated with olefinic resin 7 Olefinic resin sheet 8 Concealing resin layer 9 Fiber layer

Claims (3)

A flooring material comprising an olefinic resin composition, comprising a surface resin layer containing an olefinic resin, a printed layer laminated on the lower surface of the surface resin layer, and an adhesive layer on the lower surface of the printed layer A base material layer containing an olefin-based resin is laminated and integrated, and the base material layer has a laminated structure of three or more layers, and at least one layer of the laminated structure of three or more layers Is a fabric made of glass fiber impregnated with an olefin resin in advance, the surface resin layer has a tensile elastic modulus of 70 to 700 MPa, and the base material layer has a linear expansion coefficient of 5 × 10 ⁻⁵ × K ^−. or less ¹ or less and the olefinic flooring flexural modulus 200 MPa, olefinic flooring, wherein the residual indentation of not more than 8.0%. The olefin resin that impregnates the cloth made of glass fiber in advance has a melting point of 140 ° C. or less, and is applied in an amount of 1.0 to 3.0 times the basis weight of the cloth made of glass fiber. The olefin-based flooring according to claim 1, wherein A fiber layer is embedded in a lowermost layer of a base material layer having a laminated structure of three or more layers, and at least a part of the fiber layer is exposed on a lower surface of the lowermost layer of the base material layer. Item 3. The olefin-based flooring material according to any one of Items 1 and 2 .