JP3406465B2 - Floor tile - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor tile in which physical properties such as surface gloss, scratch resistance, stain resistance, and dent resistance are comprehensively improved, and satisfactory maintenance can be performed without using wax.

[0002]

2. Description of the Related Art Conventionally, floor tiles made of vinyl chloride resin have been widely used for flooring of buildings and condominiums. However, floor tiles made of vinyl chloride resin generate a large amount of smoke containing harmful hydrogen chloride gas during a fire,
There is a problem that it adversely affects the human body and hinders evacuation and fire fighting activities. Further, since it contains a large amount of a plasticizer and a stabilizer, there is a problem that the odor is strong.

Therefore, the present inventors have paid attention to polypropylene that does not contain halogen, and have added ethylene
A floor material made by mixing a vinyl acetate copolymer with calcium carbonate has been proposed (Japanese Patent Application No. 5-296154).

Since this flooring material contains an ethylene-vinyl acetate copolymer in polypropylene, it does not have the brittleness found in polypropylene flooring materials up to that time, and has no stain resistance or scratch resistance. It had the advantage of being improved to some extent.

[0005]

However, the above-mentioned floor materials do not show a significant improvement in surface gloss even when polished with a polisher (buffing machine), and the stain resistance and scratch resistance cannot be said to be sufficiently improved. Therefore, there is a problem that the surface is easily soiled and easily scratched. When the surface gloss is lowered due to the scratch, the surface gloss is not sufficiently restored even by polishing with a polisher, so that it is difficult to say that the maintainability is good.

The present invention has been made in view of the above problems, and comprehensively improves various physical properties such as surface gloss, scratch resistance, stain resistance, and dent resistance, and provides satisfactory maintenance without the use of wax. The purpose is to provide a floor tile that can do.

[0007]

In order to achieve the above object, the floor tile according to claim 1 of the present invention comprises 30 to 55 parts by weight of polyethylene, and either methacrylic acid, maleic anhydride or acrylic acid. 15 to 45 parts by weight of a modified modified polyolefin, 55 to 0 parts by weight of an ethylene-vinyl acetate copolymer, and 50 to 300 parts by weight of an inorganic filler are blended. .

The floor tile of claim 2 is characterized in that the polyethylene is high density polyethylene, and the floor tile of claim 3 is one in which the modified polyolefin is modified with methacrylic acid, maleic anhydride or acrylic acid. The floor tile according to claim 4, wherein the modified polyolefin is an ethylene-vinyl acetate copolymer modified with maleic anhydride, wherein the vinyl tile has a vinyl acetate content of 15%. The floor tile according to claim 5 is characterized in that a fiber layer of ginseng or the like is laminated on the back surface.

Further, the floor tile according to claim 6 is 30 to 70.
70 to 30 parts by weight of ethylene-vinyl acetate copolymer and 50 to 300 parts by weight of inorganic filler are added to parts by weight of polyolefin.
The floor tile according to claim 7 is characterized in that a back surface layer mixed in a ratio of 1 part by weight is laminated on the back surface, and the floor tile according to claim 7 is characterized in that a rosin is further mixed in a ratio of 1 to 15 parts by weight in the back surface layer. The floor tile according to item 8 is characterized in that a fiber layer such as a ginseng cloth is laminated on the bottom surface of the back surface layer.

As described above, 30 to 55 parts by weight of polyethylene and 15 to 4 of modified polyolefin modified with either methacrylic acid, maleic anhydride or acrylic acid are used.
The floor tile according to claim 1, wherein 5 parts by weight and 55 to 0 parts by weight of an ethylene-vinyl acetate copolymer are blended as a base resin, the floor tile according to claim 1 has polypropylene-ethylene- It has an initial surface gloss equal to or higher than that of the previously proposed flooring material (hereinafter referred to as the above flooring material) in which a base material resin is one containing a vinyl acetate copolymer. When the surface is polished with a polisher (buffing machine), the surface gloss of the above floor material is not so much improved, whereas the floor tile of claim 1 is significantly improved, as can be seen from the experimental data described later. . Further, when the surface is scratched to reduce the surface gloss and then the surface is polished with a polisher, the surface gloss of the previous floor material and the floor tile of claim 1 is recovered, but the previous floor material is the surface after recovery. While the gloss is not so good,
The floor tile of claim 1 has a very good surface gloss after recovery. Further, the floor tile of claim 1 has far better stain resistance and scratch resistance than the above floor material, as can be seen from the experimental data described later. Therefore, the floor tile according to the first aspect of the present invention has greatly improved maintainability as compared with the above floor material.

As described above, the physical properties of the floor tile according to claim 1 are remarkably improved and the maintainability is greatly improved because polyethylene, which is the first component resin, has a linear molecular structure with few side chains. It is a polymer that acts effectively to improve the gloss and stain resistance of the surface, and the modified polyolefin compounded as the second component resin has excellent compatibility with the filler, improving stain resistance and scratch resistance. To act effectively, the ethylene-vinyl acetate copolymer blended as the third component resin is in good harmony with polyethylene and modified polyolefin, and effectively acts to improve flexibility and moldability. This is probably due to the reason.

The polyethylene as the first component resin is preferably a high-density polyethylene having a small number of molecular branches, and the floor tile of claim 2 using such a high-density polyethylene is a low-density polyethylene. The effect of improving the above physical properties is more remarkable than that.

The modified polyolefin which is the second component resin is preferably an ethylene-vinyl acetate copolymer modified with methacrylic acid, maleic anhydride or acrylic acid, and particularly maleic anhydride. A modified ethylene-vinyl acetate copolymer containing 15 to 30% by weight of vinyl acetate is a polyethylene as the first resin component or an ethylene-vinyl acetate copolymer as the third resin component. The floor tile according to claim 3 and the floor tile according to claim 4 using these modified ethylene-vinyl acetate copolymers have various synergistic effects very effectively in synergistically with the above. The effect of improving the physical properties is remarkable.

In the floor tile according to claim 1, when the amount of polyethylene is less than 30 parts by weight and the amount of modified polyolefin is more than 45 parts by weight, the flexibility is improved, but the surface gloss is considerably lowered and the stain resistance and scratch resistance are improved. The dent resistance and the like are also reduced. On the other hand, when the amount of polyethylene is more than 55 parts by weight and the amount of modified polyolefin is less than 15 parts by weight, surface gloss, stain resistance, scratch resistance and the like are good, but flexibility is lowered. When the ethylene-vinyl acetate copolymer is more than 55 parts by weight, the flexibility is improved, but the surface gloss, stain resistance, scratch resistance, dent resistance, etc. are deteriorated. Further, if the amount of the inorganic filler is more than 300 parts by weight, the floor tile becomes weak, and if it is less than 50 parts by weight, the flame retardancy of the floor tile is deteriorated.

Further, when a fiber layer such as ginseng is laminated on the back surface as in the floor tile of claim 6, the adhesion effect to the floor and ground is improved by the anchor effect of the fiber layer.

The floor tile of the present invention may have a single layer structure,
As in the floor tile of claim 6, the back surface layer may be laminated to form a multilayer structure. Since it is not necessary to improve the surface gloss, stain resistance, scratch resistance and the like of this back surface layer, polyolefin is used as the first component resin without being limited to polyethylene. The composition of the back layer is 70 to 3 parts by weight of ethylene-vinyl acetate copolymer based on 30 to 70 parts by weight of polyolefin.
It is necessary to set the amount of the inorganic filler to be 0 parts by weight and the inorganic filler to be 50 to 300 parts by weight, the amount of the polyolefin is more than 70 parts by weight, the amount of the ethylene-vinyl acetate copolymer is less than 30 parts by weight, and the inorganic filler is If the amount is more than 300 parts by weight, the back layer becomes hard and brittle, and the adhesiveness is deteriorated. On the contrary, when the amount of the polyolefin is less than 30 parts by weight, the amount of the ethylene-vinyl acetate copolymer is more than 70 parts by weight, and the amount of the inorganic filler is less than 50 parts by weight, the flame retardancy of the back surface layer and This causes a problem that the dent resistance is reduced.

When the rosin is further added to the back surface layer in a proportion of 1 to 15 parts by weight as in the floor tile of claim 7, the adhesion to the floor and ground is improved, and the floor material of claim 8 is obtained. When a fiber layer such as a gauze cloth is laminated on the bottom surface of the back surface layer, the adhesiveness is further improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of a floor tile according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view thereof.

This floor tile has a side length of 30 to 45.
Floor tile body 1 with a square shape of about 1 cm
A back surface layer 2 is integrally laminated on the back surface of the (front surface layer), and a fiber layer 3 such as a gauze cloth is laminated in a partially embedded state on the bottom surface of the back surface layer 2.

The floor tile body 1 comprises 15 to 55 parts by weight of polyethylene and 15 to 15 of modified polyolefin modified with methacrylic acid, maleic anhydride or acrylic acid.
~ 45 parts by weight, 50 ~ ethylene-vinyl acetate copolymer
It is a mixture of 0 parts by weight and an inorganic filler in a proportion of 50 to 300 parts by weight, and its preferable thickness is about 1 to 5 mm, but it is not particularly limited.

As the polyethylene as the first component resin, high density polyethylene (specific gravity: about 0.94 to 0.96) produced by the medium / low pressure method and having a small number of molecular branches is preferably used. However, of course, low density polyethylene (specific gravity: about 0.92) produced by the high pressure method can also be used.

As the modified polyolefin which is the second component resin, low density polyethylene, high density polyethylene, polypropylene, ethylene-vinyl acetate copolymer (hereinafter referred to as "modified polyolefin" modified with methacrylic acid, maleic anhydride or acrylic acid EVA)), ethylene-ethyl acrylate copolymer, ethylene-acrylic acid ester copolymer and the like are used. Among them, modified EVA is preferable, and in particular, modified EVA with maleic anhydride and containing 15 to 30% by weight of vinyl acetate is
Good compatibility with polyethylene as the first component resin and EVA as the third component resin, especially good compatibility with the filler, and synergistically various physical properties (especially surface gloss, stain resistance, scratch resistance, dent resistance, etc. ) Is extremely effective for the improvement of the above), and thus is suitably used.

As the EVA of the third component resin, a relatively soft EVA having a vinyl acetate content in the range of 15 to 70% by weight is preferably used, and such EVA is effective for improving flexibility and the like. To work. Incidentally, this EVA may be omitted when the above-mentioned modified EVA is used as the second component resin.

As the inorganic filler, various conventionally known fillers can be used. Among them, calcium carbonate powder having an average particle diameter of 10 μm or less, and calcium carbonate powder and aluminum hydroxide powder are used. Mixed powders are preferably used. Although flame retardancy can be imparted to the floor tile body 1 only by adding calcium carbonate powder, when a mixed powder of calcium carbonate powder and aluminum hydroxide powder is added, aluminum hydroxide releases water during thermal decomposition. Therefore, a floor material having high flame retardancy can be obtained.

The mixing ratio of the above polyethylene, modified polyolefin, EVA, and inorganic filler is 30
~ 55 parts by weight, 15 to 45 parts by weight, 55 to 0 parts by weight, 5
The reason why the amount is set to 0 to 300 parts by weight has already been described in detail, so the description thereof will be omitted here.

If desired, the floor tile body 1 may include pigments, peroxide crosslinking agents, coupling agents, lubricants such as bisamides, phenolic antioxidants, hindered amine light stabilizers, and the like. A small amount of various additives may be contained.

On the other hand, the back surface layer 2 is made by blending 30 to 70 parts by weight of polyolefin with 70 to 30 parts by weight of EVA and 50 to 300 parts by weight of an inorganic filler, and the thickness thereof is 0. It is about 5 to 5 mm, but is not particularly limited.

As the polyolefin of the back surface layer 2, polyethylene, polypropylene or the like is used. As described above, not only polyethylene but also other polyolefins can be used because it is not necessary to improve the surface gloss, stain resistance, scratch resistance and the like in the case of the back surface layer 2.

As the EVA of the back surface layer 2, a relatively soft one having a vinyl acetate content of 15 to 70% by weight and a relatively hard one having a vinyl acetate content of 70 to 90% by weight are mixed and used. It is desirable to mix such an EVA having a high vinyl acetate content, and it is effective for improving the dent resistance and cushioning property.

As the inorganic filler for the back surface layer 2,
The same as above is used.

The mixing ratio of the polyolefin, EVA, and inorganic filler in the back surface layer 2 is 30 to 70 parts by weight and 7 parts by weight, respectively.
The reason why the amount is set to 0 to 30 parts by weight and 50 to 300 parts by weight has already been described in detail, and the description thereof will be omitted here.

It is desirable to mix rosin in the back surface layer 2 in a proportion of 1 to 15 parts by weight. When the rosin is mixed in this way, the adhesion to the floor and ground is improved. This is because the rosin is highly compatible with EVA and has excellent adhesiveness with the inorganic filler, so that the inorganic filler is used as the backside layer 2
This is because it firmly holds the back surface layer 2 to suppress the weakening of the back surface layer 2 and improves the adhesive strength (peeling resistance) with the floor surface. Therefore, the flooring material in which the back surface layer 2 is mixed with rosin can be firmly adhered to the floor surface using a commercially available floor adhesive. If the blending amount of rosin is more than 15 parts by weight, the tensile strength of the back surface layer 2 may be lowered, and if it is less than 1 part by weight, it is difficult to significantly improve the adhesiveness, which is not preferable.

Furthermore, a fiber layer 3 such as a gauze cloth is laminated on the bottom surface of the back surface layer 2 in a partially embedded state, and the anchoring effect of the fiber layer 3 further enhances the adhesion of the back surface layer 2 to the floor surface. Has been. As the fiber layer 3, various materials such as non-woven cloth, woven cloth, glass fiber, paper and the like can be used in addition to ginseng.

Needless to say, a small amount of the above-mentioned additive may be added to the back surface layer 2 if necessary.

The above-mentioned back surface layer 2 does not necessarily have to be provided, and the back surface layer 2 may be omitted to provide a single-layer floor tile composed of only the floor tile body 1. In that case, it is desirable that the above-mentioned rosin is blended in the floor tile body 1 at a ratio of 1 to 15 parts by weight to enhance the adhesiveness to the floor ground, and further, the above-mentioned fiber layer 3 is added to the back surface of the floor tile body 1. It is desirable that the adhesiveness be further improved by stacking in a partially embedded state. If the amount of rosin added exceeds 15 parts by weight,
There is a possibility that the hue of the floor tile body 1 may become unstable, and if it is less than 1 part by weight, it becomes difficult to remarkably improve the adhesiveness.

The floor tile composed of the front surface layer 1, the back surface layer 2 and the fiber layer 3 described above can be manufactured, for example, by the following method.

First, 30 to 55 parts by weight of polyethylene, 15 to 45 parts by weight of modified polyolefin, and 55 to 55 parts by weight.
0 parts by weight of EVA, 50 to 300 parts by weight of an inorganic filler and, if necessary, a small amount of additives are mixed and granulated by an extruder to form a powder or granule.

On the other hand, 30 to 70 parts by weight of polyolefin, 70 to 30 parts by weight of EVA, 50 to 300 parts by weight of inorganic filler, and optionally 1 to 15 parts by weight of rosin and a small amount of additives. Are mixed and sheeted with an extruder to prepare a sheet to be a back layer.

Then, a fiber layer is laid on the lower surface of the sheet,
The above-mentioned powder and granules are stacked on the upper surface of the sheet, heated, pressed by a pressure roll or the like to be integrated, and then cut into squares having a predetermined size to manufacture a floor tile. The fiber layer 3 may be thermocompression bonded to the bottom surface of the back surface layer 2 later.

When the surface of the floor tile having the above-mentioned structure is polished with a polisher (buffing machine), the surface gloss of the floor tile body 1 does not need to be coated with wax, as shown in the experimental data described later. Noticeably improved. And
Various properties such as stain resistance, scratch resistance, and dent resistance of the floor tile body 1 have been comprehensively improved. Even if the surface is scratched and the surface gloss is reduced, the surface gloss can be improved by polishing with a polisher. Is remarkably recovered. Therefore, this floor tile has very good maintainability and does not need to be waxed.

Further, the back surface layer 2 is improved in brittleness and cushioning property, so that the floor tile body 1 can be backed up and a good tread feeling can be imparted. And the thing which mix | blended rosin has the favorable adhesiveness with respect to floor ground, and the thing which laminated | stacked the fiber layer 3 on the bottom face of the back surface layer 2 improves adhesiveness remarkably.

[0043]

EXAMPLES Next, more specific examples and comparative examples of the floor tile of the present invention will be described.

Example 1 35 parts by weight of high-density polyethylene (HDPE2400 manufactured by Tosoh Corp.) and 15 parts by weight of modified EVA (VR101 manufactured by Mitsui DuPont Polychemical Co., Ltd.) modified with maleic anhydride. Parts, 50 parts by weight of unmodified EVA having a vinyl acetate content of 19% by weight,
Calcium carbonate powder having an average particle diameter of 3 μm was uniformly kneaded at a ratio of 220 parts by weight, extruded from an extruder, and pulverized to obtain a powdery particle having a particle diameter of 1.9 mm or less.

On the other hand, 40 parts by weight of high-density polyethylene (HDPE5700 manufactured by Tosoh Corporation) was added with 40 parts by weight of non-modified EVA having a vinyl acetate content of 60% by weight and vinyl acetate content of 80% by weight. 20 parts by weight of unmodified EVA and 220 parts by weight of the above-mentioned calcium carbonate powder were kneaded and sheeted with an extruder to form a sheet (thickness 1 mm) as a back layer.

Then, the above-mentioned powder and granules were laminated on this sheet, heated to 200 ° C. and pressed at 10 kg / cm ² to integrally form a floor tile body 1 having a thickness of 2.5 mm. A sample of floor tile with a two-layer structure was prepared.

For this floor tile sample, the degree of improvement in surface gloss by the polisher, the degree of recovery of the surface gloss by the polisher after scratching the surface,
Stain resistance (discoloration degree), scratch resistance, residual dents, and flexibility were examined in the following manner.

Degree of Improvement of Surface Gloss by Polisher The above sample was pasted on a plastic substrate through a hard board made of paper, and a gloss meter (H manufactured by Suga Test Instruments Co., Ltd.) was used.
G-246) was used to measure the initial surface glossiness of the surface layer of this sample based on the test method of JIS K 7105. The results are 14 as shown in Table 1 below.
%Met.

Next, a low-speed polisher (floor electric polisher MPS-70 / 12 manufactured by Marubayashi Electric Machinery Co., Ltd.)
Using a nylon soft pad (Sumitomo 3M Co., Ltd. yellow pad) at a rotation speed of 250 rpm, 2
The surface of the sample was buffed (driaf) by rotating for 0 sec / m ² . Then, when the surface glossiness of the sample after buffing was measured by the same method as above using a gloss meter,
As shown in Table 1 below, it jumped to 43%. Similarly, when the second dry fluff operation and the measurement of the surface glossiness and the third dry fluff operation and the measurement of the surface glossiness were repeated, as shown in Table 1 below, after the second dry fluff operation, The surface glossiness was 49%, and the surface glossiness after the third dry burff was 53%, and the surface glossiness was remarkably improved.

Degree of Recovery of Surface Gloss by Polisher After Scratching the Surface Instead of the above soft pad, a hard pad (green pad manufactured by Sumitomo 3M Ltd.) was attached to the polisher,
The surface of the sample was scratched by rotating the pad at 250 rpm for 20 sec / m ² , and the surface glossiness was measured. As a result, the surface gloss was 9 as shown in Table 1 below.
Fell to%.

Next, the hard pad was replaced with the soft pad again, and the dry roof operation and the measurement of the surface gloss were repeated three times to examine the degree of recovery of the surface gloss of the sample. As a result, as shown in Table 1 below, the surface gloss after the first buff is 25%, the surface gloss after the second buff is 31%, and the surface gloss after the third buff. Was 48%, and it was found that the surface gloss was restored to a state close to the state before the surface was scratched.

Stain Resistance (Discoloration Degree) With respect to floor tile samples, the stain resistance when the surface layer is not abraded and not scratched and the stain resistance when the surface layer is abraded and scratched are I checked it as follows.

[Stain resistance when not scratched without abrasion] A rubber ring which does not wrap abrasive paper according to the method of JIS A 1453 while dropping standard contaminants according to JIS L 1023 on the surface of the sample. The surface of the sample was abraded 80 times, and the removal of contaminants was stopped, and the aforesaid rubber ring was abraded 20 times. And JIS K
The color difference (ΔE) between the stain-free sample and the original stain-free sample was determined by the color-difference measuring method of 7105. As a result, the color difference was only 4. 4 as shown in Table 2 below.
It was 4%.

[Stain resistance when worn and scratched] J
Based on the method of IS A 1453, the surface of the sample was abraded 150 times with a rubber ring wrapped with abrasive paper. Then, the surface of the flooring material sample was polished 80 times with a rubber ring from which abrasive paper was removed in the same manner as described above while dropping the above-mentioned contaminants on the surface of this worn and scratched sample. After stopping dropping, polishing was performed 20 times, and then the color difference (ΔE) was measured in the same manner as above. As a result, the color difference was as small as 7.5% as shown in Table 2 below.

Scratch resistance The surface of the sample was polished 150 times with a rubber ring wrapped with abrasive paper according to the JIS A 1453 abrasive paper method, and the depth of the scratch on the surface was measured with a laser surface shape measuring microscope (manufactured by Keyence Corporation). It was observed with VF-7500). as a result,
The depth of surface scratches was moderate, as shown in Table 2 below.

Residual dents As a result of examining the residual dents of the sample by the method for testing the residual dents of JIS A 5705, the residual dents were 9.4% as shown in Table 2 below.

A flexible sample was cut into a strip having a width of 5 cm and a length of 25 cm,
A large number of test pieces were prepared. Then, the operation of winding the above strip-shaped test piece around a plurality of pipes having different diameters is repeated three times, and the pipe with the smallest diameter that does not cause cracks in the strip-shaped test piece is checked for all three times, and the pipe is flexible from large to small. The quality of the sex was judged. As a result, the minimum pipe diameter at which the test piece did not crack was 30 mm or less, as shown in Table 2 below.

[Examples 2 and 3] 54 parts by weight of the high-density polyethylene (HDPE2400) used in Example 1 was mixed with 23 parts by weight of the maleic anhydride-modified EVA used in Example 1 and the same as used in Example 1. Modified EVA (VA: 19
%), And the calcium carbonate powder used in Example 1 was uniformly kneaded at a ratio of 220 parts by weight, extruded from an extruder, and pulverized to obtain a granular material (particle size: 1. 9
A sample of floor tile of Example 2 was prepared in the same manner as in Example 1 except that (mm or less) was used.

Also, 40 parts by weight of the maleic anhydride-modified EVA used in Example 1 was added to 50 parts by weight of the high-density polyethylene (HDPE2400) used in Example 1, and the unmodified EVA (VA) used in Example 1 was used. : 19%), and 220 parts of the calcium carbonate powder used in Example 1.
An example was carried out in the same manner as in Example 1 except that a powdery material (particle size: 1.9 mm or less) obtained by uniformly kneading in a proportion of parts by weight, extruding from an extruder, and crushing this was used. Samples of 3 floor tiles were made.

For these samples of Examples 2 and 3, in the same manner as in Example 1, the degree of improvement of the surface gloss by the polisher, the degree of recovery of the surface gloss by the polisher after scratching the surface, and the stain resistance. The properties (discoloration), scratch resistance, residual dents, and flexibility were examined. The results are shown in Tables 1 and 2 below.

[Comparative Examples 1 to 4] 50 parts by weight of polypropylene (FM801 manufactured by Tokuyama Soda Co., Ltd.) was added to unmodified EVA (VA: 28%) having a vinyl acetate content of 28% by weight.
Of 50 parts by weight and the calcium carbonate powder used in Example 1 at a ratio of 200 parts by weight are uniformly kneaded and extruded from an extruder, and this is pulverized to obtain a granular material (particle diameter: 1.9 mm or less). It was Then, in the same manner as in Example 1, a back layer sheet (thickness 1 mm) was prepared, the above-mentioned powder and granules were laminated on this sheet, heated at 200 ° C., and pressed at 50 kg / cm ^2. A floor material sample of Comparative Example 1 in which a floor tile body having a thickness of 2.5 mm was integrally formed was prepared.

Also, 10 parts by weight of the maleic anhydride-modified EVA used in Example 1 was added to 60 parts by weight of the high-density polyethylene (HDPE2400) used in Example 1, and the unmodified EVA (VA) used in Example 1 was used. : 19%), and 220 parts by weight of the calcium carbonate powder used in Example 1.
A comparative example was carried out in the same manner as in Example 1 except that a powdery material (particle diameter: 1.9 mm or less) obtained by uniformly kneading in a proportion of parts by weight, extruding with an extruder, and crushing this was used. Two floor tile samples were made.

Further, 50 parts by weight of the maleic anhydride-modified EVA used in Example 1 was added to 20 parts by weight of the high-density polyethylene (HDPE2400) used in Example 1, and the unmodified EVA (VA) used in Example 1 was used. : 19%), and 220 parts by weight of the calcium carbonate powder used in Example 1.
A comparative example was carried out in the same manner as in Example 1 except that a powdery material (particle diameter: 1.9 mm or less) obtained by uniformly kneading in a proportion of parts by weight, extruding with an extruder, and crushing this was used. Samples of 3 floor tiles were made.

Further, 45 parts by weight of the unmodified EVA (VA: 19%) used in Example 1 was added to 55 parts by weight of the high-density polyethylene (HDPE2400) used in Example 1.
The calcium carbonate powder used in Example 1 was uniformly kneaded at a ratio of 220 parts by weight, extruded by an extruder, and pulverized to obtain a granular material (particle diameter: 1.9 mm or less). In the same manner as in Example 1, a floor tile sample of Comparative Example 4 was manufactured.

Then, with respect to the floor tile samples of Comparative Examples 1 to 4, the degree of improvement of the surface gloss by the polisher and the degree of the recovery of the surface gloss by the polisher after the surface was scratched in the same manner as in Example 1. , Stain resistance (discoloration degree), scratch resistance, residual dents, and flexibility were examined. The results are shown in Tables 1 and 2 below.

[Table 1]

[Table 2]

Looking at Table 1, the floor tile sample of Example 1 has an initial surface gloss of 14%, and polypropylene and unmodified EVA (VA: 28%) are used as the component resins of the floor tile body. Although the initial surface gloss of the sample of Comparative Example 1 is about 16%, the samples of Examples 2 and 3 have an initial surface gloss of 37 to 38%, which is far superior to the sample of Comparative Example 1. ing.

Then, when the first dry buffing was performed with a polisher, the surface glossiness of the sample of Comparative Example 1 was 14
%, The surface glossiness of the samples of Examples 1 to 3 increases to 43 to 51%. In addition, the samples of Comparative Example 1 only increase the surface glossiness to 23% even after the second and third dry buffs, whereas the flooring samples of Examples 1 to 3 are the second time. And 3
The surface dryness is 53-59% after the third dry buff
Will rise significantly.

From the above, Example 1 of the present invention in which polyethylene was used instead of polypropylene, and maleic anhydride-modified EVA was further blended in addition to non-modified EVA
It can be seen that the samples of Nos. 3 to 3 have a remarkable effect of improving the surface gloss when dry-dried with a polisher.

If a hard pad is used to scratch the surface,
The surface glossiness of the sample of Comparative Example 1 is significantly reduced to 4%, whereas the surface glossiness of the samples of Examples 1 to 3 is only reduced to 9 to 19%. It can be seen that the floor material samples of Nos. 3 to 3 are less likely to be damaged than the floor material sample of Comparative Example 1.

When the dry buffing is repeated three times with a polisher after the scratches are made as described above, the surface glossiness of both the samples of Comparative Example 1 and Examples 1 to 3 is recovered, but the sample of Comparative Example 1 is recovered. Then the recovered surface gloss is 2
While the floor material samples of Examples 1 to 3 have a low surface gloss of 2%, the recovered surface gloss is as high as 48 to 55%, which is almost the same as the surface gloss before scratching.

From the above, the samples of Examples 1 to 3 in which polyethylene was used in place of polypropylene and maleic anhydride-modified EVA was further blended in addition to the unmodified EVA were polished even if the surface was scratched. It can be seen that the effect of recovering the surface gloss is remarkable if the dry driving is performed.

Next, referring to Table 2, the discoloration degree (color difference) due to the contaminated liquid when the surface is not abraded is 11.9% in the sample of Comparative Example 1, whereas the samples of Examples 1 to 3 are Is very small at 1.2 to 4.4%. The degree of discoloration due to the contaminated liquid when the surface is abraded is as large as 17.3% in the samples of Comparative Example 1, whereas it is as small as 3.0 to 7.5% in the samples of Examples 1 to 3. Has become.

From the above, the samples of Examples 1 to 3 in which polyethylene was used in place of polypropylene and maleic anhydride-modified EVA was further blended in addition to the unmodified EVA were also significantly improved in stain resistance. I understand.

Regarding the scratch resistance, the depths of scratches of the samples of Examples 1 to 3 are "small" to "medium", whereas the depths of scratches of the floor material sample of Comparative Example 1 are "small". It is clear from this that the samples of Examples 1 to 3 also have improved scratch resistance.

Regarding the residual dent, the sample of Comparative Example 1 was 8.1%, whereas the samples of Examples 1 to 3 were 6.1 to 9.4%, and the dent resistance was also somewhat. It turns out that it will be improved.

Regarding the flexibility, the samples of Examples 1 to 3 are all less than 50 mmφ, and it is understood that the flexibility is improved as compared with the sample of Comparative Example 1 having 50 mmφ or more.

Next, the blending ratio of polyethylene was increased to 60% by weight, and the blending ratio of maleic anhydride-modified EVA was 1%.
The sample of Comparative Example 2 reduced to 0% by weight has almost the same surface gloss, stain resistance, scratch resistance, and dent resistance as the samples of Examples 1 to 3, but poor flexibility of 60 mmφ or more. There is a great risk of cracking when bent. The sample of Comparative Example 4 containing no maleic anhydride-modified EVA has lower surface gloss, scratch resistance, flexibility, etc. than the samples of Examples 1 to 3. On the other hand, the sample of Comparative Example 3 in which the blending ratio of polyethylene was reduced to 20% by weight and the blending ratio of maleic anhydride-modified EVA was increased to 50 parts by weight, the sample was excellent in flexibility, but surface glossiness, stain resistance, and
Scratch resistance and dent resistance are not very good. From this, in order to comprehensively improve various physical properties such as surface glossiness, stain resistance, scratch resistance, residual dents, and flexibility of the floor tile, the mixing ratio of polyethylene is set in the range of 30 to 55 parts by weight. It can be judged that it is necessary to set the blending ratio of the maleic anhydride-modified EVA within the range of 15 to 40 parts by weight.

[0078]

As is apparent from the above description, the floor tile of the present invention is improved in surface gloss by a polisher or the like.
Various properties such as surface gloss recovery, stain resistance, scratch resistance, dent resistance, and flexibility can be comprehensively improved, and sufficient effects can be obtained such that sufficient maintenance can be performed without using wax. Further, the effect of being able to further improve the adhesiveness to the floor and the ground is obtained by blending rosin and laminating fiber layers such as cheesecloth.

[Brief description of drawings]

FIG. 1 is a perspective view showing a floor tile according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of the same floor tile.

[Explanation of symbols]

1 Floor tile body 2 Back layer 3 fiber layers

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B32B 27/32 B32B 27/32 Z D06N 3/00 DAA D06N 3/00 DAA (72) Inventor Katsuichi Hirata, Azuchi-cho, Chuo-ku, Osaka-shi 2-chome 3-13 Takiron Co., Ltd. (56) Reference JP-A-7-125145 (JP, A) JP-A-7-195629 (JP, A) JP-A-8-156192 (JP, A) Kaihei 4-277561 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04F 15/10 104 B32B 27/12 B32B 27/18 B32B 27/20 B32B 27/28 101 B32B 27 / 32 D06N 3/00 DAA

Claims (8)

(57) [Claims] Claims: 1. To 30 to 55 parts by weight of polyethylene, 15 to 45 parts by weight of a modified polyolefin modified with methacrylic acid, maleic anhydride or acrylic acid, and 55 to 0 of an ethylene-vinyl acetate copolymer. A floor tile formed by mixing 50 parts by weight and 50 parts by weight of an inorganic filler. 2. The floor tile according to claim 1, wherein the polyethylene is high density polyethylene. 3. The modified polyolefin is an ethylene-vinyl acetate copolymer modified with methacrylic acid, maleic anhydride, or acrylic acid.
Floor tile described in. 4. The modified polyolefin is an ethylene-vinyl acetate copolymer modified with maleic anhydride and contains 15 to 30% by weight of vinyl acetate.
Floor tile described in. 5. The floor tile according to any one of claims 1 to 4, wherein a fiber layer such as a gauze cloth is laminated on the back surface. 6. A back surface layer obtained by mixing 30 to 70 parts by weight of polyolefin with 70 to 30 parts by weight of an ethylene-vinyl acetate copolymer and 50 to 300 parts by weight of an inorganic filler is laminated on the back surface. The floor tile according to any one of claims 1 to 4. 7. The floor tile according to claim 6, further comprising rosin in the backside layer in an amount of 1 to 15 parts by weight. 8. The floor tile according to claim 6 or 7, wherein a fiber layer such as a gauze cloth is laminated on the bottom surface of the back surface layer.