KR102638416B1 - Flooring and manufacturing method thereof - Google Patents

Abstract

While the clarity of the design is improved, a flooring material with high peel strength is provided. One embodiment of the present invention includes a base layer, a digital printing layer disposed on the base layer, a receptor layer disposed on the digital print layer, and a metallic pearl layer disposed on the receptor layer, and transmits light in the visible light region. A flooring material having a light reflectance value (LRV) of 35 to 60% is provided.

Description

Flooring and its manufacturing method {FLOORING AND MANUFACTURING METHOD THEREOF}

The present invention relates to a flooring material and a method of manufacturing the same, and more specifically, to a flooring material and a method of manufacturing the same that can ensure excellent durability by preventing peeling of the flooring layer while improving aesthetics by improving the clarity of the design.

Recently, with the development of color mixing technology and the level of consumers' perception of color and aesthetics of products has improved, design products with various aesthetics that can satisfy the needs of consumers are being released. Among them, consumer interest in and demand for interior materials such as wallpaper, flooring, and ceiling finishing materials, which are greatly influenced by design elements, is increasing.

In particular, in the case of flooring, it is not only a design element, but also involves actual friction and use, such as when a user directly steps on or places an object, so there is a limitation in improving aesthetics while satisfying the required functions of the flooring.

Accordingly, like wood texture flooring, metal texture flooring, and marble texture flooring, the actual material is composed of a flooring layer using resin, and by giving natural design patterns and colors to the surface, it improves the aesthetics of the flooring and serves as a flooring material. Research is continuously being conducted to satisfy the required physical properties such as durability, impact resistance, and scratch resistance.

Meanwhile, the gravure printing process uses a method of forming an image on the surface of the base paper by placing ink in the pocket of the printing roll and spreading the ink evenly on the surface of the base paper. However, there was a problem in obtaining high printing quality because it was difficult for the printing roll to reach the surface of the base paper evenly, and as the printing process progressed, the durability of the printing roll deteriorated, making it difficult to print accurately, making it difficult to realize a clear design for flooring. there was. The digital printing process proposed to solve this problem has the advantage of being able to create vivid designs, but is mostly limited to four ink types (CMYK (cyan, magenta, yellow, black)), so metallic pearl pigments are used. There were limitations in applying the pearl ink containing it to the digital printing process.

After numerous experiments and repetitions, the present inventor derived the technical idea of introducing a metallic pearl layer into the digital printing layer through a manufacturing method using a transfer film, thereby improving aesthetics and ensuring excellent durability by preventing peeling of the flooring layer. A flooring material and its manufacturing method have been completed.

The purpose of the present invention is to solve the above limitations and provide a flooring material that can improve the clarity of the design and overcome the problem of delamination between layers of the flooring material.

Another object of the present invention is to provide a method for manufacturing flooring that can solve the limitations of introducing a metallic pearl layer into a digital printing process.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention that are not mentioned can be understood by the following description and will be more clearly understood by the examples of the present invention. Additionally, it will be readily apparent that the objects and advantages of the present invention can be realized by means and combinations thereof as set forth in the claims.

One embodiment of the present invention for achieving the above object includes a base layer, a digital printing layer disposed on the base layer, a receptor layer disposed on the digital print layer, and a metallic pearl layer disposed on the receptor layer, Provides a flooring material having a light reflectance value (LRV) of 35 to 60% in the visible light region. Preferably, the light reflectance of the flooring material in the visible light region may be 40 to 60%, more preferably 45 to 55%.

In detail, the metallic pearl layer may include 20 to 30% by weight of metallic pearl pigment based on the total weight of the metallic pearl layer.

Another embodiment of the present invention for achieving the above object further includes a white layer disposed between the base layer and the digital printing layer and a transparent layer disposed on the metallic pearl layer, the digital printing layer and the metallic pearl layer. And the first laminated structure consisting of the receptor layer is transferred onto one surface of the white layer. It is possible to provide a flooring material.

Another embodiment of the present invention to achieve the above object may further include a surface protection layer disposed on the transparent layer.

According to one embodiment of the present invention, it is possible to provide a flooring material that can improve the clarity of the design and at the same time overcome the problem of delamination between layers of the flooring material. In addition, according to one embodiment of the present invention, it is possible to solve at once the existing limitation that it was difficult to implement the aesthetic effect of flooring with a metallic texture due to the difficulty of introducing a metallic pearl layer in the digital printing process.

In addition to the above-described effects, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

1 is a vertical cross-sectional view of a flooring material according to an embodiment of the present invention.
Figure 2 is a flow chart showing a method of manufacturing flooring according to an embodiment of the present invention.

Hereinafter, each configuration of the present invention will be described in more detail so that those skilled in the art can easily implement it. However, this is only an example, and the scope of rights of the present invention is determined by the following contents. Not limited.

In this specification, 'digital printing layer' is defined as a printing layer formed by a digital printing process.

One embodiment of the present invention includes a base layer, a digital printing layer disposed on the base layer, a receptor layer disposed on the digital print layer, and a metallic pearl layer disposed on the receptor layer, and transmits light in the visible light region. A flooring material having a light reflectance value (LRV) of 35 to 60% is provided.

Below, the configuration of the present invention will be described in more detail with reference to FIG. 1.

1. Flooring

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

Referring to FIG. 1, the flooring material 100 according to the present invention includes a base layer 10 that supports members disposed on the top of the base layer, such as a printing layer, and absorbs shock from the outside.

For example, the base layer 10 may include a first polyvinyl chloride resin having a degree of polymerization of 500 to 2,000 and a filler.

For example, the filler may be CaCO ₃ or Al(OH) ₃ and may be included in an amount of 350 to 750 parts by weight based on 100 parts by weight of the first polyvinyl chloride resin. However, this is an example, and the base layer is not particularly limited as long as it supports the printing layer and can function as a flooring material, and may be configured differently depending on the shape and characteristics of the flooring material.

The thickness of the base layer 10 may be, for example, 2 to 5 mm.

The white layer 20 according to the present invention is a white colored layer that conceals the color of the base layer and can clearly highlight the pattern or pattern of the printing layer, which will be described later.

The white layer 20 may be disposed on the base layer 10, and specifically may be placed directly on the base layer 10. Accordingly, the white layer 20 may be disposed between the base layer 10 and the digital printing layer 30, which will be described later.

The white layer 20 may include, for example, a second polyvinyl chloride resin having a degree of polymerization of 500 to 2,000, a plasticizer, a filler, and a white pigment.

The plasticizer may be, for example, a phthalate-based plasticizer or a non-phthalate-based plasticizer. The phthalate plasticizer may be, for example, dioctyl phthalate (DOP), di-isononyl phthalate (DINP), dioctyl terephthalate (DOTP), etc., and the non-phthalate plasticizer may be, for example, a citrate-based compound. The citrate-based compounds include triethyl citrate, acetyl triethyl citrate, tributyl citrate, acetyl tributyl citrate, trioctyl citrate, acetyl trioxyl citrate, trihexyl citrate, acetyl trihexyl citrate, It may be butyryl trihexyl citrate, trimethyl citrate, etc.

The filler may include inorganic particles to supplement the physical properties of the second polyvinyl chloride resin and may be, for example, CaCO ₃ or Al(OH) ₃ .

The content of the plasticizer may be 20 to 30 parts by weight based on 100 parts by weight of the second polyvinyl chloride resin, and the content of the filler may be 30 to 50 parts by weight.

The white layer 20 may further include additives as needed, and the content of the additives may be appropriately adjusted. The additive may be, for example, a Ba-Zn, Na-Zn, or K-Zn-based stabilizer.

The thickness of the white layer 20 may be, for example, 0.05 to 0.1 mm.

The white pigment may be necessary to realize the white color of the white layer 20, and may be included in an amount of 10 to 15 parts by weight based on 100 parts by weight of the second polyvinyl chloride resin.

The digital printing layer 30 according to the present invention may be disposed on the white layer 20, and specifically may be disposed directly on the white layer 20.

Specifically, the digital printing layer 30 is used to form a pattern or pattern to enhance the aesthetics of the flooring material, and may be manufactured through a digital printing process. The digital printing process is a process that allows high-resolution images of various designs such as photos, pictures, and patterns desired by consumers to be printed using a digital printer.

The digital printing layer 30 according to the present invention may include a first pattern formed on its surface by a digital printing machine. Specifically, the first pattern is set by a program of a digital printer and may be a variety of patterns. The thickness of the digital printing layer 30 may be, for example, 1 to 6 μm.

The digital printing layer 30 according to the present invention may include printing ink to introduce various colors. The printing ink may include, for example, acrylic resin and color pigment. The content of the color pigment can be appropriately adjusted depending on the concentration of a predetermined color. For example, the color pigment may be a typical inorganic pigment or organic pigment applied to a digital printing machine.

Specifically, the color pigment may be any one selected from the group consisting of cyan pigment, purple pigment, yellow pigment, black pigment, and mixtures thereof. Preferably, the color pigment may include all four types of pigments in order to realize various colors with four types of CMYK ink types.

Most of the printing inks applied to the conventional digital printing layer are limited to the above four CMYK ink types, so there are limitations in applying pearl ink containing pearl pigment to the digital printing process. Because of this, there was a problem in that the sparkling effect due to the metallic pearl pigment could not be realized in the process of manufacturing the flooring material including the digital printing layer. According to the present invention, a flooring material with a sparkling effect and a metallic texture due to the metallic pearl pigment can be realized by arranging a metallic pearl layer on a digital printing layer in a method of manufacturing a flooring material using a transfer method to be described later.

The receptor layer 40 according to the present invention may be necessary to facilitate printing with ink for digital printing. In general, since the metallic pearl layer contains pearl ink, there is a problem of low bonding strength with other members. According to one embodiment of the present invention, the metallic pearl layer can be effectively bonded to the digital printing layer through the receptor layer 40 containing an acrylic resin as a base resin, and as a result, the interlayer peel strength can be increased.

The receptor layer 40 may include acrylic resin, inorganic particles, and metal salt. The acrylic resin may serve as a binder in the composition for forming a receptor layer.

Monomers for synthesizing the acrylic resin include, for example, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, lauryl acrylate, Cyclohexyl acrylate, methyl methacrylate, hexyl methacrylate, isopropyl methacrylate, butyl methacrylate, octyl methacrylate, acrylic acid, methacrylic acid, glycidyl acrylate, glycidyl methacrylate, hydroxide It may be hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, etc.

The weight average molecular weight of the acrylic resin may be, for example, 30,000 to 100,000 g/mol, and preferably 50,000 to 80,000 g/mol.

The inorganic particles increase the durability of the receptor layer, for example, one type selected from the group consisting of TiO ₂ , Ca(OH) ₂ , CaO, Al(OH) _3, Al ₂ O ₃ , CaCO ₃ and silica. Or it may include two or more types.

The content of the inorganic particles may be 1 to 5 parts by weight, preferably 2 to 4 parts by weight, based on 100 parts by weight of the acrylic resin. If the content of the inorganic particles is less than the above numerical range, the durability of the receptor layer may not be sufficiently improved, and if it exceeds the above numerical range, there may be a problem of inorganic particles being eluted.

The metal salt may be necessary for the acrylic resin to be well dissolved in the composition for forming the receptor layer. The metal salt may be, for example, any one selected from the group consisting of nitrate of the first metal, sulfate of the second metal, chloride salt of the third metal, and combinations thereof. The first to third metals may each independently be selected from the group consisting of Zn, Cu, Fe, Mn, Li, Ag, Mg, and Ca.

The content of the metal salt may be 1 to 7 parts by weight, preferably 3 to 5 parts by weight, based on 100 parts by weight of the acrylic resin. If the content of the metal salt is less than the above range, the acrylic resin may not be well dissolved in the composition for forming the receptor layer.

The thickness of the receptor layer 40 may be, for example, 1.5 to 3.5 μm.

The metallic pearl layer 50 according to the present invention is introduced to provide a sparkling effect to the flooring material, and may be placed on the receptor layer 40, and specifically, may be placed directly above the receptor layer 40. You can. Specifically, the thickness of the metallic pearl layer 50 may be, for example, 0.05 to 0.4 mm.

The metallic pearl layer 50 may contain a metallic pearl pigment with high hiding power to prevent the color of the lower layer from being exposed.

Specifically, the metallic pearl layer may include 10 to 60% by weight of metallic pearl pigment, preferably 15 to 35% by weight, more preferably 20 to 30% by weight, based on the total weight of the metallic pearl layer. It can be included. If the content of the metallic pearl pigment exceeds the above numerical range, the adhesive strength with the receptor layer or transparent layer may be weakened, causing the flooring layers to separate from each other, which may cause a problem of lowering the overall peel strength of the flooring, and if it is less than the above numerical range, the metallic pearl The sparkling effect caused by the pigment may be reduced, which may result in a decrease in aesthetics.

For example, the metallic pearl pigment may include one or more selected from the group consisting of titanium dioxide, zinc oxide, carbonite, and titanium dioxide-coated mica, and preferably may include titanium dioxide-coated mica. there is. By coating mica with titanium dioxide, hiding power can be further increased.

The metallic pearl layer may be manufactured by a gravure printing process.

The transparent layer 60 according to the present invention may be disposed on the metallic pearl layer 50, and specifically may be disposed directly on the metallic pearl layer 50.

The transparent layer 60 is intended to protect the pattern of the lower layer and may be a typical transparent layer in the flooring technology field. For example, the transparent layer 60 may include a third polyvinyl chloride resin, a plasticizer, a stabilizer, and a filler. Based on 100 parts by weight of the third polyvinyl chloride resin, the content of the plasticizer may be 20 to 40 parts by weight, the content of the stabilizer may be 1 to 5 parts by weight, and the content of the filler may be 50 to 100 parts by weight. The third polyvinyl chloride resin may be the same as or different from the first polyvinyl chloride resin, and descriptions of plasticizers, stabilizers, and fillers are omitted since they overlap with the above-mentioned parts.

The thickness of the transparent layer 60 may be, for example, 0.1 to 0.55 mm.

The surface protection layer 70 according to the present invention may be used to improve surface quality such as scratch resistance and abrasion resistance of flooring materials.

The surface protection layer 70 may be disposed on the transparent layer 60, and may be specifically disposed directly on the transparent layer 60. The surface protection layer 70 is a common surface protection layer in the flooring technology field, and may be manufactured by polymerizing a poly(urethane acrylate) oligomer that self-cures by ultraviolet irradiation.

The thickness of the surface protection layer 70 may be, for example, 15 to 40 μm.

The light reflectance value (LRV) of the visible light region of the flooring material 100 according to the present invention may be 35 to 60%, preferably 40 to 60%, and more preferably 45 to 55%. . The light reflectance is a measure of the visible and usable light reflected from the surface of the flooring when the flooring is illuminated by visible light. When it is within the above numerical range, the clarity of the flooring design can be best realized.

The light reflectance in the visible light region may vary independently depending on the type and content of the metallic pearl pigment and the area that the pearl ink occupies on the receptor layer, but in order to realize the clarity of the design, a natural metallic texture effect is preferably within the reflectance range. and the clarity of the design can be expressed. If the light reflectance in the visible light range of the flooring is less than the above numerical range, the reflection effect may be so small that it does not match the gloss of the metal itself, and if it exceeds the above numerical range, the light reflected from the flooring may be more noticeable from the observer's perspective. It may feel bright and lose its natural metallic texture.

Based on the total area of one side of the receptor layer, the area occupied by the pearl ink on the receptor layer may be 1 to 10%, and preferably may be less than 1 to 5%. If the area occupied by the pearl ink is less than the above numerical range, the reflection effect may be so small that it does not match the gloss of the metal itself, and if it exceeds the above numerical range, the light reflected from the flooring may feel brighter from the observer's perspective. This may cause the natural metal texture to deteriorate.

According to the present invention, a natural metallic texture effect and a sparkling effect due to a metallic pearl layer can be displayed within the above reflectance range, and an optimal content range of metallic pearl pigment can be derived to provide a flooring material with excellent peel strength.

According to one embodiment of the present invention, the peeling strength between the transparent layer and the lower layer disposed below the transparent layer based on test standard KS M 3802 may be 2.5 to 5.0 kgf/2cm. The lower layer may be any one selected from the group consisting of a white layer, a digital printing layer, a receptor layer, a metallic pearl layer, and a combination thereof. That is, the interface at which the transparent layer is peeled off with respect to the lower layer is any one selected from the group consisting of an interface between the white layer and the digital printing layer, an interface between the digital printing layer and the receptor layer, and an interface between the metallic pearl layer and the receptor layer. It can be.

2. Manufacturing method of flooring

Another embodiment of the present invention provides a method of manufacturing a flooring material implementing the above flooring material.

Figure 2 is a flow chart showing a method of manufacturing flooring according to an embodiment of the present invention. The above-described parts and repeated explanations will be briefly explained or omitted.

Referring to Figure 2, the method for manufacturing flooring according to the present invention includes the following steps.

(S1) Step: sequentially forming a metallic pearl layer and a receptor layer on the transfer film through a gravure printing process;

The method of manufacturing a flooring material according to the present invention includes the step of (S1) sequentially forming a metallic pearl layer and a receptor layer on a transfer film through a gravure printing process. Since the receptor layer contains acrylic resin as a binder, it can maintain high adhesion with the digital printing layer or metallic pearl layer. Additionally, the receptor layer can facilitate the digital printing process.

For example, the transfer film may be a PET (polyethylene terephthalate) film with excellent tensile strength. However, the technical idea of the present invention is not limited to the type of transfer film.

(S2) Step: forming a digital printing layer on the receptor layer by a digital printing process;

The method of manufacturing a flooring material according to the present invention includes the step of (S2) forming a first laminated structure by forming a digital printing layer on the receptor layer through a digital printing process.

The first laminated structure consisting of the digital printing layer, the metallic pearl layer, and the receptor layer may be transferred onto one side of a white layer, which will be described later.

Most inks for forming digital printing layers are limited to the four CMYK ink types, so there are limitations in applying pearl inks containing pearl pigments to the digital printing process, and it is difficult to implement diverse and vivid designs. did. According to the present invention, in order to solve the above problem, a pearl pigment can be applied to the digital printing process by sequentially forming a metallic pearl layer, a receptor layer, and a digital printing layer on a transfer film through a digital printing process.

(S3) Step: Forming a second laminated structure by sequentially stacking a base layer and a white layer, and then transferring the first laminated structure to the second laminated structure.

The method of manufacturing a flooring material according to the present invention may include preparing a base layer and a white layer through a calendering molding process.

Specifically, the method of manufacturing a flooring material according to the present invention includes forming a second laminated structure by sequentially stacking the base layer and the white layer, and transferring the first laminated structure to the second laminated structure.

For the step of laminating the second laminated structure and the first laminated structure, a roll press process can be used. Specifically, the roll press process is preferably maintained at a temperature of 120 to 150°C for 5 to 20 seconds.

(S4) Step: After separating the transfer film, forming a transparent layer on the metallic pearl layer.

The method of manufacturing a flooring material according to the present invention includes the step of (S4) separating the transfer film and then forming a transparent layer on the metallic pearl layer. As a result, in the transfer process using the above-described transfer film, the metallic pearl layer is disposed immediately below the transparent layer, so the metallic texture and sparkling effect due to the metallic pearl pigment can be more prominent.

(S5) Step: Forming a surface protective layer on the transparent layer

The method of manufacturing a flooring material according to the present invention includes the step of (S5) forming a surface protection layer on the transparent layer. In step (S5), the surface protective layer may be manufactured by applying a photocurable resin such as poly(urethane acrylate) oligomer on the transparent layer and then curing it with ultraviolet rays. For example, the amount of ultraviolet rays may be 1,000 to 1,200 mJ/cm ² .

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, this is only an example, and the scope of rights of the present invention is determined by the following contents. Not limited.

[Preparation Example 1: Preparation of composition for forming receptor layer]

A composition for forming a receptor layer was prepared including an acrylic resin (monomer: methyl methacrylate) with a weight average molecular weight of 50,000 g/mol, 3 parts by weight of silica, and 4 parts by weight of CaCl ₂ based on 100 parts by weight of the acrylic resin.

[Manufacturing Example 2: Pearl ink for forming metallic pearl layer]

Gravure printing ink, 22% by weight of mica coated with titanium dioxide on the surface, 20% by weight of acrylic resin (monomer: methyl methacrylate) with a weight average molecular weight of 50,000 g/mol, and methyl ethyl ketone (MEK). Pearl ink containing 35% by weight was used.

[Manufacturing Preparation Example 3: Printing ink for forming digital printing layer]

A printing ink for forming a digital printing layer was prepared containing an acrylic resin (monomer: methyl methacrylate) with a weight average molecular weight of 50,000 g/mol and 5 parts by weight of four types of CMYK pigments based on 100 parts by weight of the acrylic resin.

[Manufacture Example 1: Preparation of flooring]

The composition for forming the PVC base layer includes 100 parts by weight of the first polyvinyl chloride resin, 400 parts by weight of CaCO ₃ and 4 parts by weight of a plasticizer (DOP; dioctyl phthalate).

The composition for forming the PVC white layer includes 100 parts by weight of the second polyvinyl chloride resin, 13 parts by weight of white pigment (TiO ₂ ), 40 parts by weight of CaCO ₃ and 25 parts by weight of plasticizer (DOP; dioctyl phthalate).

<Example 1: Flooring material hybridizing digital printing process and gravure process>

After forming a metallic pearl layer (thickness: 0.2 mm) with the pearl ink according to Preparation Example 2 on the PET transfer film through a gravure printing process, a composition for forming a receptor layer according to Preparation Example 1 is applied on the surface of the metallic pearl layer. A receptor layer (thickness: 2.5㎛) was formed according to the gravure printing process. According to the digital printing process, a digital printing layer (thickness: 1㎛, 1-degree printing) with a predetermined pattern is formed on the receptor layer using the printing ink according to Manufacturing Preparation Example 3, resulting in the first laminated structure. Manufactured.

A second laminated structure was manufactured consisting of the PVC base layer (thickness: 4.3 mm) and the PVC white layer (thickness: 0.1 mm) disposed on the PVC base layer. The first laminated structure was transferred to the upper surface of the PVC white layer so that the digital printing layer was bonded to the white layer. After removing the PET transfer film, a conventional PVC transparent layer (thickness: 0.5mm) and a surface protection layer (thickness: 25㎛) were sequentially formed directly on the metallic pearl layer to finally prepare the flooring material.

<Example 2: Case where the content of pearl pigment was different from Example 1>

A flooring material was prepared in the same manner as in Example 1, except that instead of 22% by weight, 15% by weight of mica coated with titanium dioxide was used on the surface.

<Example 3: Case where the content of pearl pigment was different from Example 1>

A flooring material was prepared in the same manner as in Example 1, except that instead of 22% by weight of mica coated with titanium dioxide on the surface, 19% by weight was used.

<Example 4: Case where the content of pearl pigment was different from Example 1>

A flooring material was prepared in the same manner as in Example 1, but instead of 22% by weight, 25% by weight of mica coated with titanium dioxide was used.

<Example 5: Case where the content of pearl pigment was different from Example 1>

A flooring material was prepared in the same manner as in Example 1, but instead of 22% by weight, 30% by weight of mica coated with titanium dioxide was used.

<Example 6: Case where the content of pearl pigment was different from Example 1>

A flooring material was prepared in the same manner as in Example 1, but instead of 22% by weight, 35% by weight of mica coated with titanium dioxide was used.

<Comparative Example 1: Flooring with a printed layer formed through the gravure printing process>

The PVC base layer (thickness: 4.3 mm) and the PVC white layer (thickness: 0.1 mm) disposed on the PVC base layer were formed. Afterwards, the same predetermined pattern as in Example 1 was printed on the PVC white layer using a gravure printer to form a printed layer (thickness: 1 μm; 1-degree printing). Afterwards, a metallic pearl layer (thickness: 0.2 mm) made with the pearl ink for forming a metallic pearl layer according to Preparation Example 2 was sequentially formed on the printed pattern using a gravure printing process. Afterwards, a conventional PVC transparent layer and a surface protection layer were sequentially formed on the metallic pearl layer.

<Comparative Example 2: Case where metallic pearl layer is not formed unlike Example 1>

Flooring was manufactured in the same manner as in Example 1, but the step of forming a metallic pearl layer using the pearl ink according to Preparation Example 2 was omitted.

[Experimental example: Evaluation of light reflectance and peeling strength of flooring]

The light reflectance and peel strength in the visible light region of the flooring material according to Preparation Example 1 were evaluated using the following measurement method.

1) Light reflectance in the visible light region

After irradiating light in the visible range (400 to 700 nm) to the surface of the flooring specimen (width: 2.54 cm; length: 15 cm) according to Preparation Example 1, the reflectance was measured using a reflectance meter (CROMOCON, CROMOCON LRV METER). was measured and shown in Table 1 below.

2) Measurement of peeling strength of flooring material

Peel strength was measured using a small tensile tester (AMATEK LLOYD INSTRUMET) based on the test standard KS M 3802 for the flooring specimen according to Preparation Example 1 without a surface protective layer (width: 2 cm; length: 15 cm) through the following steps. was measured. Specifically, (1) first immersing the flooring specimen according to Preparation Example 1 without a surface protection layer in water at 80° C. for 1 hour; (2) taking out the immersed flooring specimen, tearing 5cm of the transparent layer on the upper part of the flooring specimen and fixing it to the upper jig, and fixing the transparent layer and the torn lower layer to the lower jig; and (3) calculating the average value of the peeling strength of 5 flooring specimens at a tensile speed of 200 mm/min. The peeling strength of the flooring specimens was evaluated (load cell used = 5kN load cell). In other words, a 5kN load cell is used and the distance between the ends of the two jigs holding the flooring specimen is 5cm. The lower jig is fixed and only the upper jig moves upward, and when the size of the load appears constant, the average value of the load is taken as the peeling strength. Measured. At this time, a certain load value appears at a point where the displacement is 100 to 150 mm or 150 to 200 mm, and the average value at this time was evaluated as the peeling strength.

Example 1 Example 2 Example 3 Example 4 Example 5 Example
6 Comparative Example 1 Comparative Example 2 pearl pigment
(% by weight) ¹⁾ 22 15 19 25 30 35 22 0 Printing layer ²⁾ D D D D D D G D reflectivity(%) 46 35 39 50 55 60 39 25 Peel strength
(kgf/2cm) 3.8 4.2 4.0 3.6 3.2 2.7 4.3 4.4 1) Mica coated with titanium dioxide
2) D=printed layer manufactured by digital printing process/G=printed layer manufactured by gravure printing process

In the flooring material according to Comparative Example 1, the printing layer is manufactured through the gravure printing process, so not only is it difficult to obtain high printing quality because it is difficult for the printing roll to evenly contact the surface of the base paper, but also the durability of the printing roll deteriorates as the printing process progresses. There was a problem that made it difficult to print accurately. Referring to Table 1, it can be seen that the flooring material according to Comparative Example 1 was outside the optimal reflectance range of 40 to 60% in the visible light region and the flooring design was not clear.

On the other hand, it can be confirmed that the flooring material according to Example 1 easily reaches the optimal range of reflectance of 40 to 60% by implementing the printing layer through a digital printing process even if the same content of metallic pearl pigment as that of Comparative Example 1 is introduced. .

In addition, Comparative Example 2 is a flooring material in which no metallic pearl layer is introduced, and it can be confirmed that the reflectance in the visible light region deviates significantly from the optimal range.

Meanwhile, referring to Examples 1 to 6, when the content of the metallic pearl pigment is 20 to 30% by weight based on the total weight of the metallic pearl layer, the optimal reflectance range in the visible light region is satisfied and the durability of the flooring material is improved. It can be confirmed that it has peel strength without any major problems.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements can be made by those skilled in the art using the basic concept of the present invention defined in the following claims. It falls within the scope of invention rights.

10: Base layer
20: White layer
30: digital printing layer
40: receptor layer
50: Metallic pearl layer
60: transparent layer
70: Surface protection layer
100: Flooring

Claims (9)

Base layer;
A digital printing layer disposed on the base layer;
A receptor layer disposed on the digital printing layer;
A metallic pearl layer disposed on the receptor layer;
A white layer disposed between the base layer and the digital printing layer; and
a transparent layer disposed on the metallic pearl layer; Including,
The metallic pearl layer is,
Contains 20 to 30% by weight of metallic pearl pigment based on the total weight of the metallic pearl layer,
The light reflectance value (LRV) in the visible light range is 45 to 55%,
Based on the test standard KS M 3802, the peeling strength between the transparent layer and the lower layer disposed below the transparent layer is 2.5 to 5.0 kgf/2cm,
Flooring.
According to paragraph 1,
The digital printing layer is,
Contains color pigments
Flooring. According to paragraph 2,
The color pigment is,
Any one selected from the group consisting of cyan pigment, purple pigment, yellow pigment, black pigment, and mixtures thereof,
Flooring. delete According to paragraph 1,
The metallic pearl layer is,
Manufactured by a gravure printing process,
Flooring. According to paragraph 1,
The receptor layer is,
Acrylic resin,
inorganic particles and
containing metal salts
Flooring. According to paragraph 1,
The first laminated structure consisting of the digital printing layer, the metallic pearl layer, and the receptor layer,
Transferred onto one side of the white layer,
Flooring.
According to paragraph 1,
A surface protection layer disposed on the transparent layer; containing more
Flooring.
delete