KR20220092229A - Tile Flooring Material Having Improved Scratch Resistance - Google Patents

Abstract

The present invention relates to a floor material including a balance layer, a base layer, a printed layer, a transparent layer, and a surface protection layer, wherein the transparent layer comprises a first transparent layer and a second transparent layer located under the first transparent layer, and the floor material has a curling property of 1.5 mm or less according to ISO 23999.

Description

Tile Flooring Material Having Improved Scratch Resistance

The present invention relates to a flooring material that is excellent in scratch resistance by including a hard transparent layer and a balance layer on the upper portion of the flooring material satisfying a predetermined hardness and thickness ratio, and the curvature of the flooring material is prevented.

The flooring material has a large impact and load applied to the surface, and as repeated friction and impact are applied, the surface is prone to scratches.

In general, a PVC flooring material having excellent processability and excellent durability such as heat resistance and chemical resistance is used as the flooring material.

However, the PVC flooring material itself is easily scratched on the surface, and after the scratch is formed, it is not easy to restore it.

Since flooring is not easy to construct and repair, research is being conducted to develop flooring products with high scratch resistance in the field of flooring technology.

For this reason, by adding a surface protection layer to the outermost surface of the flooring is configured to prevent damage to the lower printed layer, and to prevent the formation of scratches on the surface.

A transparent film layer is included under the surface protection layer to prevent damage and deformation of the flooring itself and to improve scratch resistance.

The transparent film layer may be located between the upper portion of the printing layer and the surface protection layer, or may be located on the printing layer without the surface protection layer. As it is positioned on the printed layer, it is configured to have a transparent property so that the design implemented on the printed layer can be projected through the transparent film layer.

As described above, the transparent film layer basically functions to project the printed layer while preventing damage to the printed layer and other lower layers, and functions to prevent damage to the flooring itself.

Since flooring is difficult to re-construct compared to other interior construction projects and has a characteristic that it consumes excessive time and money for construction, it is necessary to prevent damage to the exterior and function and deterioration of contamination resistance due to scratches on the flooring itself. In addition, it is important to prevent deformation of the flooring itself.

As the flooring material is formed by laminating a plurality of film layers and coating layers, the characteristics of each layer are different, and there are many characteristics of layers formed by calendering them using PVC resin as the main material. Since the PVC layer obtained by calendering is flexible by heat and laminated in an elongated state, the flooring material itself cannot be kept flat and warped due to the hardening of the softened PVC resin and changes in the surrounding environment.

By increasing the hardness of the transparent layer for preventing damage to the flooring, on the other hand, when the hardness of the transparent layer increases, there is a problem in that the flooring is easily bent due to the high hardness of the transparent layer.

Moreover, it is important that the flooring material be maintained in a flat state before and after construction in that it is also used to introduce an even floor surface by installing it on an uneven floor surface.

The present invention is to solve the above problems, and relates to a flooring material having a property of suppressing the bending of the flooring material while improving scratch resistance compared to the conventional one.

Republic of Korea Patent Publication No. 2020-0040250 (2020.04.17) Republic of Korea Patent Publication No. 2019-0068901 (2019.06.19)

An object of the present invention is to provide a flooring material having an improved effect of scratch resistance of the surface of the flooring material.

An object of the present invention is to provide a flooring material that improves the scratch resistance of the surface of the flooring material and at the same time suppresses the bending of the flooring material and maintains excellent flatness.

An object of the present invention is to provide a flooring material that is not deformed by external humidity, temperature, wear, etc. and is maintained without deformation for a long period of time and has excellent dimensional stability.

Another object of the present invention is to provide a flooring material that is excellent in scratch resistance while preventing deformation such as bending and breakage of the flooring material and maintaining good flexibility.

A flooring material according to the present invention for solving the above problems is a flooring material including a balance layer, a base layer, a printing layer, a transparent layer and a surface protection layer, wherein the transparent layer is a first transparent layer and a first transparent layer located below the first transparent layer 2 It includes a transparent layer, and the flooring material has a curling property of 1.5 mm or less according to ISO 23999.

In the present invention, the first transparent layer and the balance layer may each independently include 100 parts by weight of a PVC resin and 1 to 30 parts by weight of a plasticizer.

More specifically, the ratio of the plasticizer added to the first transparent layer and the balance layer may be 1:1-5, and more specifically, 1:2-4.

In the present invention, the thickness ratio of the first transparent layer and the balance layer may be in a range of 1: 1 to 10, and more specifically, in a thickness ratio of 1: 6 to 9.

In the present invention, the flooring material may have a flexibility according to ISO 24344 of 100 mm or less, and more specifically, 70 mm or less.

In the present invention, the flooring material may have a scratch resistance index according to ISO 4586-2 of 10 N to 15 N.

In the present invention, the first transparent layer may include 100 parts by weight of the PVC resin and 1 to 10 parts by weight of the plasticizer, and the balance layer may include 100 parts by weight of the PVC resin and 10 to 20 parts by weight of the plasticizer.

In the present invention, the second transparent layer may include 100 parts by weight of PVC resin and 25 to 35 parts by weight of a plasticizer.

The present invention has the effect of improving the scratch resistance of the surface of the flooring.

In the present invention, the formation of scratches and the like is suppressed, and damage to the appearance of the flooring is prevented.

The present invention also has the effect of preventing the bending of the flooring material due to changes in the external environment or the passage of time by maintaining a mutual balance with the balance layer even though the hard film layer is included to improve scratch resistance.

The flooring material according to the present invention has the effect of maintaining excellent flatness for a long period of time.

The flooring material according to the present invention has good flexibility while maintaining excellent scratch resistance and flatness.

1 is a vertical cross-sectional view of a flooring material according to an embodiment of the present invention.

Hereinafter, each configuration of the present invention will be described in more detail so that those of ordinary skill in the art to which the present invention pertains can easily carry out, but this is only an example, and the scope of the present invention is defined by the following contents Not limited.

The flooring material according to the present invention relates to a flooring material having improved scratch resistance than the conventional flooring material.

In general, in the case of PVC flooring, it includes a balance layer, a base layer, a printing layer, and a transparent film layer. It prevents the flooring from being damaged.

As the flooring frequently undergoes friction and collisions, it is easy to cause damage such as scratches or gaps on the surface. It is absolutely necessary in terms of construction cost.

The transparent film layer of the existing flooring material prevents damage to the surface by improving the hardness of the transparent film layer to have scratch resistance, while including a hard transparent film layer has a problem of causing the flooring to warp. The present invention relates to a flooring in which deformation of the flooring is prevented by a combination with a balance layer that prevents bending of the flooring while a part of the existing transparent film layer is composed of a hard film layer with high hardness.

Hereinafter, the configuration of the present invention will be described in more detail.

transparent layer

The transparent layer is positioned on top of the printed layer to protect the printed layer. In addition, the transparent layer serves to impart a certain rigidity to the flooring while projecting the printed layer without distortion.

Specifically, the transparent layer serves to prevent damage such as easily falling down or being pressed as a whole of the flooring material, and improves the hardness of the surface when an external shock, high load, or sharp object falls, thereby preventing the destruction or damage of the flooring. serves to prevent

The transparent layer may be used as long as it is transparent and has a function of protecting the surface of the flooring, but it is preferable to increase the hardness of the transparent layer in order to impart high scratch resistance to the surface of the flooring.

However, in the case of increasing the hardness of the transparent layer, scratch resistance is improved, while the rigid PVC transparent layer is in a softened state by heating during the flooring manufacturing process, and then shrinks when cooled. Accordingly, the transparent layer is naturally bent. may occur.

In the present invention, in order to prevent this problem, the transparent layer is divided into two or more layers, and the first transparent layer located close to the uppermost layer of the flooring is composed of a hard film layer with high rigidity, and at the same time, the lower balance layer It was configured to keep the balance in a flat state to prevent bending of the flooring material.

Specifically, the flooring material according to the present invention is characterized in that the curling property according to ISO 23999 is 1.5 mm or less by the combination of using the hard first transparent layer and the lower balance layer at the same time:

Specifically, the curling property of the tile is prepared by preparing a specimen (length, width of 240 mm x 240 mm) of a tile flooring material according to ISO 23999, and marking a part 20 mm away from one end and its opposite end, under high temperature deformation conditions ( After leaving at 80 °C for 6 hours), the specimen was left to stand at room temperature for 24 hours to measure the curling property of the specimen.

The curling property is evaluated by measuring the lifting height (distance) of the marked part from the floor surface. It is preferable that the curling property of the floating reverse curl is 1.5 mm.

When the condition of the curling property is satisfied, it can be seen that the flooring material is not curled and is in a flat state.

Therefore, more preferably, the curling property of the flooring material according to the present invention is 0.5 mm or less, in which the outer periphery of the flooring material rises in the upper direction of the flooring material, and the curling property of the reverse curl, in which the outer periphery of the flooring material sinks in the lower direction of the flooring material, is 1.5 mm or less.

The average value in each deformation condition can be calculated by measuring the height at which the edge of the tile flooring material curls from the floor in each condition with a gap gauge.

Since the lower the value of the curling property, the flatter it is, so the lower the value, the better the quality.

When it has a value higher than the curling property, the flooring material cannot be maintained in a flat state and concave and convex curves appear in the flooring material, so that the quality of the flooring material is deteriorated, and there is a problem of lowering the appearance during construction.

In the present invention, the first transparent layer may independently include 100 parts by weight of a PVC resin and 1 to 30 parts by weight of a plasticizer, preferably, 1 to 10 parts by weight, most preferably, 1 to 8 parts by weight. can do.

When the content of the plasticizer in the first transparent layer is excessive, there is a slight problem in the effect of improving the scratch resistance of the flooring material. There is a problem that peeling may appear.

On the other hand, the plasticizer is a material that softens and softens the resin component, and may be at least one selected from a phthalate-based plasticizer, a terephthalate-based plasticizer, a benzoate-based plasticizer, a citrate-based plasticizer, and a phosphate-based plasticizer. , More preferably, a non-phthalate-based plasticizer may be used in consideration of the environment-friendly point.

In the present invention, the first transparent layer has excellent scratch resistance and excellent dimensional stability of the flooring by combination with a balance layer to be described later.

Specifically, the first transparent layer may have a thickness ratio of the balance layer to 1: 1 to 10, preferably, 1: 6 to 9, and most preferably, 1: 6.5 to 8. .

When the thickness of the balance layer is thinner than the above ratio, there is a problem in that the cushioning effect of the entire flooring layer is lowered, there is a problem in that the bearing capacity is lowered, and there is a problem that deformation such as bending of the flooring material may occur.

If the thickness of the balance layer is thicker than the above ratio, the thickness of the balance layer becomes excessively thick compared to the total thickness of the flooring, and as the thickness of other layers becomes relatively thin, there is a problem that the functions of the other layers cannot be sufficiently exhibited. If the effect of increasing the thickness of the balance layer exceeds the above thickness range, there is a slight difference in the effect of preventing deformation of the flooring material.

Accordingly, in the upper part, the hard first transparent layer prevents surface scratches from being generated, while in the lower part, the balance layer has an effect of preventing distortion or warping of the flooring material, thereby maintaining a balanced shape as a whole flooring material. will have

Specifically, the transparent layer and the balance layer produced by the calendering process are formed by laminating in a fluid composition form in a stretched state through the calendering process. As the over-balance layer is cooled, the stretched PVC resin contracts and receives tension in the center direction of the flooring material. Accordingly, bending of the flooring occurs, and depending on the shape of the curvature, a static curl in which the outer periphery of the flooring is lifted in the upper direction of the flooring, and a reverse curl in which the center of the flooring is lifted in the upper direction of the flooring is generated.

In the present invention, the first transparent layer, which is a hard transparent layer, is cooled in a state located on the upper part of the flooring material, and in order to prevent the bending of the flooring material from forming stronger due to the hard characteristic, the opposite position of the first transparent layer, that is, of the flooring material It is characterized in that the balance layer located on the bottom side has a tension that balances the tension generated in the first transparent layer, so that the occurrence of warpage is suppressed.

On the other hand, the transparent layer further includes a second transparent layer in addition to the first transparent layer that is a hard film. The second transparent layer refers to any and all layers that are distinct from the first transparent layer, and is not limited to one layer and may have two or more configurations. The first transparent layer refers to a layer that satisfies the above-described plasticizer content and the thickness ratio of the balance layer, and the second transparent layer refers to a transparent layer having physical properties different from those of the first transparent layer.

The transparent layer may have a thickness of 30 to 550 μm (micrometers), and preferably, may have a thickness of 50 to 530 μm (micrometers).

If the thickness of the transparent layer is thicker than the above ratio, the thickness of the other layer becomes thinner within the limited thickness range of the flooring material, and there is a problem that the function of the other layer is not sufficiently exhibited. The improvement effect is insignificant.

Specifically, the first transparent layer may have a thickness of 50 to 150 μm (micrometer). Preferably, the first transparent layer may have a thickness of 60 to 100 μm (micrometer).

When the thickness of the first transparent layer is thicker than the thickness, there may be a problem in that it is easily separated from the second transparent layer, and when it is thinner than the thickness, the scratch resistance improvement effect is insignificant.

The second transparent layer is not particularly limited as long as it is a layer distinguished from the first transparent layer in hardness, physical properties, etc. as described above, but may include a plasticizer, and may be added in an amount of 25 to 35 parts by weight based on 100 parts by weight of the PVC resin.

As described above, the second transparent layer is not limited to being composed of one layer, and as long as it is a layer distinct from the first transparent layer, it may be composed of two or more layers. Two or more layers constituting the second transparent layer are not limited to be composed of the same component and may have different physical properties.

The transparent layer may optionally further include one or more selected from antioxidants, lubricants, processing aids, stabilizers, flame retardants, matting agents, impact stabilizers and flame retardants, and when added, the first transparent layer and the agent 2 The transparent layer may be added in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the PVC resin based on each layer.

If it is added in excess than the above content, there may be a problem that the transparency of the transparent layer is lowered or the hardness of each transparent layer is not implemented as desired, and when added in a small amount than the above content, there is a problem that the function as an additive cannot be exhibited. .

The degree of polymerization of the PVC resin may be, for example, 700 to 1300, which is an example, and is not limited thereto. In this regard, all PVC resins to be described later may be configured to have the same and similar configuration.

The transparent layer may be any method of forming a PVC layer in the art, and for example, it may be manufactured as a transparent layer through a process such as PVC extrusion and calendaring.

In the present invention, the transparent layer may further include an impact modifier if necessary. In particular, the impact modifier may be configured to be included in the first transparent layer.

The impact modifier serves to reduce the amount of impact transmitted from the surface of the flooring to other layers in the thickness direction of the flooring, and to prevent damage and deformation of the flooring by dispersing the impact in the surface direction.

The impact modifier may be added in an amount of 0 to 10 parts by weight, preferably 3 to 5 parts by weight, based on 100 parts by weight of the PVC resin.

The impact modifier may be, for example, adding components such as acrylate and butadiene, and may be added in the form of a mixture including different components or different particle sizes without adding a single component.

balance layer

The balance layer is located at the bottom of the flooring material and serves to maintain the bending balance. Specifically, the balance layer is a layer that serves to maintain the balance of the entire flooring material to prevent deformation due to shrinkage, bending, etc. of other layers positioned thereon.

The balance layer may be manufactured by molding the composition for forming the balance layer, and the manufacturing form or configuration may be composed of a single polymer, and it is also possible to configure using a composite material.

It is not limited as long as it can be used in the art and it is possible to use various materials.

For example, it may be composed of a PVC layer, and by adding other additives such as a filler or a plasticizer, a material whose physical properties are appropriately adjusted to function as a balance layer may be used.

In the present invention, it may be manufactured on the basis of a PVC resin. As the balance layer serves to adjust the bending balance of the entire flooring, it may be configured to have a thickness of 0.1 to 2.0 mm based on a 5 mm thick flooring material. Preferably, it may be 0.2 to 1.5 mm. However, this is only an example, and in the present invention, various modifications are possible within a range that satisfies the thickness ratio of the first transparent layer and the balance layer.

If it is thicker than the above thickness, the overall thickness of the flooring material is thickened, or in order to produce a flooring material of a certain thickness, the thickness of the other layers must be relatively thin, and thus each layer may not sufficiently perform its function. can

If it is thinner than the thickness, the effect of maintaining the bending balance is not sufficient, and there may be problems such as bending of the flooring. In particular, due to the rigid characteristics of the first transparent layer, as the upper layer of the flooring material is bent, the balance cannot be maintained and other layers are deformed together, so that the floor layer is deformed to a lifting shape. .

When the balance layer is composed of a layer containing a PVC resin, 100 parts by weight of the PVC resin may be configured to include 1 to 30 parts by weight of a plasticizer, preferably, 10 to 20 parts by weight may be configured to include , More preferably, it may be configured to be included in an amount of 10 to 18 parts by weight.

When included in excess than the above content, the bearing capacity of the balance layer is lowered, the walking feeling of the flooring material is lowered, and there may be problems such as a phenomenon of turning off the flooring material according to long-term use, and it is added in a small amount than the above content In this case, the impact absorbing effect or the noise absorbing effect is poor, and there is a problem in that it is difficult to satisfy the basic quality required for the flooring material.

In particular, in the present invention, based on the content of the plasticizer included in the first transparent layer, the plasticizer may be included in a ratio of 1: 1: 1-5. Preferably, it may be included in a ratio of 1: 2 to 4, and most preferably, it may be included in a ratio of 1: 2.2 to 3.8.

If the proportion of the plasticizer content of the balance layer is excessive than the above content, the balance layer can be easily deformed according to the deformation shape of the first transparent layer, so that the bending balance is greatly reduced, and accordingly, there is a problem that the flooring cannot be maintained flat, When the proportion of the plasticizer content of the balance layer is insignificant than the above content, the rigidity balance with the first transparent layer is broken, and there may be problems such as distortion of the flooring material.

base layer

The base layer is located on the balance layer and serves to impart volume and strength to the flooring material. In addition, it serves to give a background color to the flooring before forming the printed layer.

The base layer may be manufactured by molding a composition for forming the base layer. A method such as directly forming a coating layer using the composition, or laminating after forming into a film may be used.

The base layer is a layer laminated to face the balance layer directly, and since it is the region that occupies the thickest thickness of the entire flooring material, it is preferable to configure it to have a certain level of rigidity so as not to be too hard or too soft.

As long as it can be used as a base layer, it may be composed of various materials such as a polymer layer and a composite material layer. For example, it can be prepared by adding various additives such as fillers and plasticizers to the PVC resin.

The base layer may be configured to have a thickness of 50 to 85% based on the total thickness of the flooring material, and preferably, may be configured to have a thickness range of 55 to 80%. If the above-mentioned range is satisfied, it can serve to give volume and strength to the flooring.

print layer

The printed layer is formed on the base layer, and serves to impart various appearance and design effects to the flooring material.

The print layer may be formed by printing an ink composition according to a design on the surface of the base layer forming the background color. The printing method is not particularly limited and can be printed by various methods, and for example, methods such as transfer printing, gravure printing and screen printing can be used.

The printed layer may have a thickness of 0.02 to 0.2 mm. Preferably, it may be 0.04 to 0.15 mm.

If it is thicker than the above thickness, the thickness of the other layer becomes relatively thin, and the function of the other functional layer becomes insignificant, and there is a problem that the quality of the flooring material is deteriorated. Because it is not clearly expressed, there may be a problem in that the aesthetics is lowered or the base layer is reflected.

The printing layer is prepared using a composition for forming a printing layer, that is, an ink composition, and an ink composition including an acrylic resin and pigments of various colors may be used.

surface protective layer

The surface protection layer is a UV coating layer, and serves to prevent damage to the flooring by external sharp objects. The surface protective layer is configured to include an acrylic resin and beads.

The bead is variously applicable as long as it can impart scratch resistance without interfering with UV curing while maintaining a transparent property, regardless of types of inorganic beads, organic beads, and the like.

For example, a material such as a metal oxide bead, a glass bead, an acrylic bead, etc. may be used, and preferably, a metal oxide bead may be used. More specifically, a material such as alumina may be used as the metal oxide bead.

The average particle diameter of the beads is also not limited and can be applied in various sizes, but introduced in an appropriate size in consideration of the thickness of the surface protective layer so as not to cause problems in the contamination resistance of the surface protective layer, irregularities on the surface, and the formation of curves can be

Specifically, the beads may have an average diameter of 1 to 40 μm (micrometers), and the thickness of the surface protection layer may be configured to be 20 μm (micrometers) or less. Preferably, it may be 15 μm (micrometer) or less.

If it is thicker than the above thickness, the thickness of the other layer becomes thinner, and there may be a problem in that the balance layer, the base layer, the printing layer and the transparent film layer do not sufficiently function.

Since the surface protection layer is a component that can be selectively included, it is preferable to introduce it to an appropriate thickness in consideration of the functionality of other layers as described above when adding it.

The surface protection layer is formed using a coating solution using an acrylic resin.

The acrylic resin refers to a resin prepared by polymerizing a (meth)acrylic monomer, and includes an acrylic monomer and an acrylic oligomer.

In particular, the acrylic resin according to the present invention is a photocurable acrylic resin, and has a property of being cured by UV.

The acrylic resin is composed of the remainder except for components such as beads and photoinitiators added to the surface protection layer.

The beads may be included in an amount of 1 to 20 parts by weight, preferably, 3 to 18 parts by weight, based on the total weight of each layer.

When it is added in excess of the above content, the viscosity of the coating solution increases and spreadability is lowered. .

It may further include a friction reducing agent. The friction reducing agent may be added in an amount of 0.5 to 5% by weight based on the total weight of the first surface protection layer.

The friction reducing agent has an effect of reducing friction on the surface of the flooring material, thereby preventing the object from sliding and forming scratches when in contact with an object that can form scratches on the surface of the flooring material.

When added in excess than the above content, it has a level of slipperiness that is difficult to function as a flooring material, and problems such as sliding easily while walking or easily sliding objects placed on the flooring material may occur, and a smaller amount than the above content In the case of adding it, there is no significant difference from the case of not adding it, so there is a slight problem in the effect of preventing the formation of scratches.

As the friction reducing agent, for example, at least one selected from the group consisting of a silicone-based slip agent and a fatty acid-based wax may be used.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a vertical cross-sectional view of a flooring material according to an embodiment of the present invention.

The balance layer 10 , the base layer 20 , the printed layer 30 , the transparent layer 40 , and the surface protection layer 50 are sequentially stacked in the height direction from the bottom surface.

In the present invention, the transparent layer 40 may be composed of the first transparent layer 42 and the second transparent layer 41 . As described above, the first transparent layer is a hard layer constituting the upper portion of the transparent layer, and while improving the scratch resistance of the surface, it has an effect of suppressing both reverse curl and static curl by balancing it with the balance layer of the bottom.

The thickness range of the flooring material according to the present invention is not significantly limited as long as it satisfies the thickness ratio of the first transparent layer and the balance layer and the plasticizer content ratio, but may be 1.5 to 10 mm, preferably, 1.8 to 6 mm. can be

On the other hand, the flooring material according to the present invention may have a flexibility according to ISO 24344 of 100 mm or less, preferably, 70 mm or less.

ISO 24344, a standard for evaluating the flexibility of flooring materials, is the Mandrel Test, and is a method of measuring the diameter of a rod that does not crack when a flooring product is rolled up on a rod of a certain diameter. The smaller the number, the better the flexibility of the flooring material.

It may be evaluated differently depending on the thickness of the flooring material, for example, in the case of 5.0T flooring, it is preferably 70 mm or less.

Hereinafter, the present invention will be described in more detail based on examples, but the scope of the present invention is not limited by the following contents.

[Production Example]

In order to manufacture a flooring material, a balance layer, a base layer, a printed layer, and a transparent layer were sequentially laminated.

The balance layer was prepared by preparing a mixture by mixing 100 parts by weight of PVC resin, 40 parts by weight of carbon and a plasticizer, and calendering it, and the base layer was prepared by mixing 100 parts by weight of carbon, 670 parts by weight of carbon, and 50 parts by weight of a plasticizer. After preparing it, it was prepared by calendering it.

After forming a printing layer by gravure printing the printing ink composition on the surface of the base layer, a second transparent layer was laminated on the surface, and a first transparent layer was laminated on the surface.

On the outermost surface, a surface protective layer coating solution prepared by adding 100 parts by weight of silicone urethane acrylate, 11 parts by weight of alumina beads, and 1 part by weight of a photoinitiator was applied, and then cured by irradiating light with a wavelength of 360 nm to form a surface protective layer. It was formed to a thickness of 0.02 mm.

The total thickness of the flooring material was manufactured to be 5 mm, and the remaining thickness other than the thickness of the surface protection layer and the surface protection layer was configured to be occupied by the base layer.

(Unit: parts by weight) Example comparative example One 2 3 One 2 3 4 5 6 7 8 first
transparent layer PVC 100 Plasticizer (GL300, LG Chem) 5 4 5 30 5 5 5 5 5 5 5 acrylate 0 One 0 0 0 0 0 0 0 0 10 Thickness (㎛) 70 70 65 70 70 70 70 45 170 70 70 second
transparent layer PVC 100 Plasticizer (GL300, LG Chem) 30 30 30 30 5 30 30 30 30 65 30 Thickness (㎛) 450 450 430 450 450 450 450 475 350 450 450 balance layer PVC 100 Plasticizer (GL300, LG Chem) 15 10 15 15 15 25 2.5 15 15 15 15 Thickness (㎛) 500 500 500 500 500 500 500 500 500 500 500

[Experimental example]

The physical property evaluation was performed on the manufactured flooring material as follows.

1. Scratch resistance evaluation

After scratching the surface of the single-layer sheet flooring material using the Ericsson ballpoint pen tip scratch test method using an Erichsen hardness tester (model name: Erichsen 413), the load value (N) required for the surface of the single-layer sheet flooring material to be scratched was determined to ISO 4586 After measurement according to the -2 standard, the load value (N) was described as a scratch resistance index. The higher the load value (N), the better the scratch resistance.

2. Measurement of Curling

Prepare a specimen (length and width of 240 mm x 240 mm) of a tile flooring material according to ISO 23999, mark a part 20 mm away from one end and its opposite end, and leave it under high temperature deformation conditions (80 ° C for 6 hours) After that, it was left at room temperature for 24 hours to measure the curling properties of the specimen.

Since the curling property is evaluated by measuring the height (distance) of the displayed part from the bottom surface, the smaller the value, the flatter it is. It is desirable that the curling property of the straight curl, which lifts the outer periphery of the flooring in the upper direction of the flooring material, is 0.5 mm or less, and the curling property of the reverse curl, in which the center of the floor material floats in the upper direction of the flooring (the outer periphery of the floor material sinks in the downward direction), is 1.5 mm. desirable.

3. Flexibility Measurement

In accordance with ISO 24344, the Mandrel Test, which measures the diameter of a rod that does not cause cracks in the product when a specimen of tile flooring is rolled up on a rod of a certain diameter, was conducted. The smaller the number, the better the flexibility of the flooring material.

It may be evaluated differently depending on the thickness of the flooring material, for example, in the case of 5.0T (thickness 5 mm) flooring, when it has a value of 70 mm or less, flexibility may be evaluated as good.

Example comparative example One 2 3 One 2 3 4 5 6 7 8 scratch
Indices
(load, N) 12 14 12 6 12 11 12 8 12 10 8 Curling (mm) Junk: 0.4 Junk: 0.4 Junk: 0.3 reverse curl:
1.2 Junk:
1.5 Jungle: 1.0 reverse curl:
1.6 reverse curl:
1.5 Junk: 1.2 Reverse curl: 1.2 reverse curl:
1.5 Flexibility (mm) 55 65 50 20 100 45 75 40 75 30 55

Referring to the experimental contents, it can be confirmed that the flooring tiles of the examples have excellent scratch resistance and good flexibility while maintaining a flat shape without bending due to low curling properties.

Specifically, in comparison with Example 1, when the plasticizer content of the first transparent layer is excessive as in Comparative Example 1, it can be seen that the scratch resistance of the surface is greatly reduced, and as the warpage balance with the balance layer is broken, reverse curl It can be seen that this appears. This is the same as the case in which a transparent layer of a single property is included as in the conventional flooring tiles, and it can be seen that the scratch resistance is somewhat inferior as in the conventional flooring materials.

On the other hand, in the case of Comparative Example 2, as the second transparent layer is composed of the same hard layer as the first transparent layer, it can be seen that the junctional phenomenon due to the shrinkage of the transparent layer is serious. In addition, it can be seen that flexibility is greatly reduced as the thick hard transparent layer is included.

In Comparative Examples 3 and 4, as the content of the plasticizer was excessively added to the balance layer, it was confirmed that the bending balance with the first transparent layer could not be maintained, and the junctional bending according to the contraction of the first transparent layer appeared, and the balance layer When the hardness of is excessive, it can be confirmed that the reverse curl due to the contraction of the balance layer is excessively generated.

In particular, in the case of Comparative Example 4, it can be confirmed that the flexibility of the flooring material is greatly reduced as the balance layer is composed of an excessively hard layer.

On the other hand, when the thickness of the first transparent layer is thin as in Comparative Example 5, the effect of improving the scratch resistance of the surface is insignificant, and as the first transparent layer does not sufficiently suppress the bending caused by the balance layer, it is confirmed that the reverse curling is displayed. could

When the thickness of the first transparent layer is thick as in Comparative Example 6, while the scratch resistance is good, a curling phenomenon similar to that of Comparative Example 2 was observed, and it can be seen that the flexibility was significantly lowered compared to the Example.

In the case of Comparative Example 7, as the second transparent layer was composed of a softer layer, the scratch resistance was good, but there was a problem in that the bending of the flooring tile appeared.

As in Comparative Example 8, when the content of the impact modifier in the first transparent layer was excessive, as the physical properties of the first transparent layer were lowered, there was a problem that there was no significant difference in physical properties compared to the existing flooring material (Comparative Example 1). .

Claims (10)

As a flooring material comprising a balance layer, a base layer, a printing layer, a transparent layer and a surface protection layer,
The transparent layer includes a first transparent layer and a second transparent layer positioned under the first transparent layer,
The flooring material has a curling property of 1.5 mm or less according to ISO 23999.
The method of claim 1,
The first transparent layer and the balance layer each independently include 100 parts by weight of PVC resin and 1 to 30 parts by weight of a plasticizer.
The method of claim 1,
The first transparent layer and the balance layer have a thickness ratio of 1: 1 to 10.
3. The method of claim 2,
The ratio of the plasticizer added to the first transparent layer and the balance layer is 1: 1-5.
The method of claim 1,
The flooring material has a scratch resistance index of 10 N to 15 N according to ISO 4586-2.
3. The method of claim 2,
The first transparent layer comprises 100 parts by weight of PVC resin and 1 to 10 parts by weight of a plasticizer,
The balance layer is a flooring material comprising 100 parts by weight of PVC resin and 10 to 20 parts by weight of a plasticizer.
The method of claim 1,
The second transparent layer is a flooring material comprising 100 parts by weight of PVC resin and 25 to 35 parts by weight of a plasticizer.
The method of claim 1,
The flooring material is a flooring material having a flexibility of 70 mm or less according to ISO 24344.
The method of claim 1,
The first transparent layer and the balance layer have a thickness ratio of 1: 6-9.
3. The method of claim 2,
The ratio of the plasticizer added to the first transparent layer and the balance layer is 1: 2 to 4 flooring.

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