JP2016113834A - Decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet having lightness of wiping properties during cleaning and less visibility of unevenness of wiping and having excellent cleanability appropriate for a floor material.SOLUTION: In a decorative sheet 10, a picture pattern layer 2, a transparent adhesive layer 3, a transparent thermoplastic resin layer 4, and a surface protection layer 7 are formed in this order on a resin base material sheet 1. In a layer 6 positioned on at least an outermost surface of the surface protection layer 7, a 60° mirror surface glossiness based on JIS Z 8741 is in the range of 20-35.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a decorative sheet including a resin base sheet such as a plastic film. In particular, the present invention relates to a decorative sheet excellent in cleanability that can be applied to a flooring material and its periphery by being bonded to a woody base material.

Decorative sheets have been developed and developed in the process of residential construction developing as an industry. In particular, it can be said that prefabricated architecture has played a leading role in apartments, condominiums, and individual houses that are collective housing.
Since ancient times, houses have been made of materials based on local characteristics, such as wood and stone, and people have lived in styles rooted in their own culture, but with the development of the housing industry, the transition from natural materials to artificial materials has progressed. Has been done. In recent years, the heavy use of high-grade wood and stone materials can lead to deforestation and environmental problems, which is another factor that increases the demand for decorative sheets.

For example, in recent years, a so-called sheet flooring material in which a decorative sheet is bonded to the surface of a wood substrate such as plywood, MDF (medium fiber plate) or particle board has been widely used as a flooring material (Patent Document 1). reference).
In addition, after the interior decoration work of apartments, condominiums, and individual houses is completed, there is a room cleaning by a management company and a beauty contractor. Wipe and clean the adhesive scraps such as gypsum board and putty, dust, etc. scattered on the floor with water or detergent.
When wiping and cleaning a sheet flooring floor material, if the dry wiping property after wiping with water is heavy or unevenness is likely to occur during wiping, problems such as troublesome cleaning may occur.

Japanese Patent No. 5045180

  The present invention has been made in view of such a situation, and provides a decorative sheet having lightness of wiping at the time of cleaning, difficulty in seeing uneven wiping, and excellent cleaning properties as a flooring. It is an object.

  In order to solve the problem, the decorative sheet according to one embodiment of the present invention is formed with a pattern layer, a transparent adhesive layer, a transparent thermoplastic resin layer, and a surface protective layer in this order on a resin base sheet. The layer located at least on the outermost surface of the surface protective layer has a 60-degree specular gloss of 20 or more and 35 or less in accordance with JIS Z 8741.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the decorative sheet | seat which is easy to wipe off gypsum board, adhesives, scraps, such as putty, and dust accumulated at the time of indoor construction, and has a cleaning property as a flooring.

It is a cross-sectional schematic diagram of the decorative sheet which concerns on embodiment based on this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 1, the decorative sheet 10 of the present embodiment is provided with a pattern layer 2 on one surface (front surface) of both the front and back surfaces of the resin base material sheet 1, on which A transparent adhesive layer 3 and a transparent thermoplastic resin layer 4 are laminated, and a surface protective layer 7 is further laminated. The surface protective layer 7 of this embodiment is an example of a case where the first surface protective layer 5 and the second surface protective layer 6 are composed of two layers.

Moreover, the back surface resin coat layer 8 which comprises a resin layer is provided in the surface (back surface) on the opposite side to the design pattern layer 2 in the base material sheet 1.
The resin base sheet 1 is made of, for example, a colored thermoplastic resin. As the thermoplastic resin, for example, vinyl chloride resin, acrylic resin, polyolefin-based polypropylene resin or polyethylene resin can be used. Of these, polyolefin resins can be preferably used in terms of environmental compatibility, processability, and cost. In addition, the grade and composition of the resin can be selected in consideration of ease of sheeting, printability, and suitability for bending.

  When the base material sheet 1 is colored, the base material to which the decorative sheet is bonded is concealed, and the hue can be appropriately selected as the background color of the pattern pattern layer 2. For example, when a thermoplastic resin is sheeted, it can be colored by mixing and kneading a colorant such as a pigment. Alternatively, a colored layer can be provided under the pattern layer 2 by using a coating or printing technique as a solid ink layer before the pattern layer 2 is provided.

The picture pattern layer 2 can be provided using a known printing method. When the base sheet 1 can be prepared in a wound state, printing for forming the pattern layer 2 can be performed with a roll-to-roll printing apparatus. The printing method is not particularly limited, but for example, a gravure printing method can be used in consideration of productivity and picture quality.
The design pattern may be any pattern design in consideration of the design as a flooring material, and if it is a wood-based design, it is often preferred to use various types of wood grain. It can also be. For example, if it is an image of a stone floor such as marble, it may be used as a pattern such as a marble stone. In addition to the pattern made of natural materials, an artificial pattern such as an artificial pattern or a geometric pattern using these as a motif can also be used.

Although it does not specifically limit about printing ink, The ink corresponding to a printing system can be selected suitably. In particular, it is preferable to select in consideration of adhesion to the resin base material sheet 1, printability, and weather resistance as a flooring material.
If necessary, an adhesive layer (not shown) is formed on the pattern layer 2 for the purpose of improving the adhesion between the pattern layer 2 and the transparent adhesive layer 3 and between the transparent adhesive layer 3 and the transparent thermoplastic resin layer 4. May be provided. The resin used for the adhesive layer (not shown) is not particularly limited. For example, a two-component curable urethane resin can be used, and for example, it can be provided using a coating apparatus, a gravure printing apparatus, or the like.

The transparent adhesive layer 3 is provided for the purpose of strengthening the adhesion between the base sheet 1 and the pattern / pattern layer 2 and the transparent thermoplastic resin layer 4. When this adhesion is strong, it is possible to give the decorative sheet 10 bending workability that follows a curved surface or a right-angled surface.
For the transparent thermoplastic resin layer 4, for example, a vinyl chloride resin, an acrylic resin, a polyolefin-based polypropylene resin, or a polyethylene resin can be used. Of these, polyolefin resins can be preferably used in terms of environmental compatibility, processability, and cost.
In addition, the grade and composition of the resin can be selected in consideration of ease of sheeting, printability, and suitability for bending. In particular, in bending workability, it is important to select in consideration that whitening and cracking of the bent portion do not occur.

The transparent adhesive layer 3 and the transparent thermoplastic resin layer 4 can be formed by, for example, co-extrusion and extruding both at the same time.
The transparent thermoplastic resin layer 4 has an effect that the decorative sheet has a thickness and depth that are designed to increase, and can improve the weather resistance and wear resistance of the decorative sheet.

A surface protective layer 7 is provided on the transparent thermoplastic resin layer 4. The surface protective layer 7 may be a single layer, or a plurality of layers may be stacked to form the surface protective layer 7. In the decorative sheet 10 of the present embodiment, as shown in FIG. 1, two layers of a first surface protective layer 5 and a second surface protective layer 6 are provided as the surface protective layer 7.
The surface protective layer 7 has an important role that determines the superiority or inferiority of bending workability, scratch resistance, and cleanability. In addition, it is important to select in consideration of cleanability. As a result of intensive studies on this point, we have found the following knowledge.
That is, the main component of the second surface protective layer 6 corresponding to the outermost layer of the surface protective layer 7 is a mixture of an ultraviolet curable resin and a thermosetting resin, thereby satisfying scratch resistance when used on a floor. At the same time, in the bending process, it was found that whitening and cracking of the surface protective layer hardly occur.

The second surface protective layer 6 corresponding to at least the outermost layer of the surface protective layer 7 is made of a mixture of an ultraviolet curable resin and a thermosetting resin. You may provide another additive suitably to the mixture. The mixing ratio of the ultraviolet curable resin and the thermosetting resin is set so as to be in the range of 7: 3 to 9: 1 in terms of mass ratio. That is, in the mixture, the ultraviolet curable resin is 70 to 90% by mass, and the thermosetting resin is 3 to 15% by mass. The main component refers to, for example, 85% or more of the total amount of the mixture of the ultraviolet curable resin and the thermosetting resin.
In this way, the main component of the second surface protective layer 6 corresponding to the outermost layer of the surface protective layer 7 is a mixture of an ultraviolet curable resin and a thermosetting resin, so that it is scratch resistant when used on a floor. At the same time, whitening and cracking of the surface protective layer are less likely to occur during bending.

In addition, silica and other matting agents are added to the second surface protective layer 6, and the matting agent to be added and the amount thereof are adjusted to adjust the second surface protective layer 6 to 60 ° in accordance with JIS Z 8741. The specular gloss value was adjusted to be 20 or more and 35 or less.
Thus, by setting the 60-degree specular gloss value of the second surface protective layer 6 in accordance with JIS Z 8741 to 20 or more and 35 or less, unevenness after wiping during cleaning becomes conspicuous as described later.

In order to provide the surface protective layer 7 composed of the first surface protective layer 5 and the second surface protective layer 6, each layer is applied and cured using a known coating apparatus, thermal drying apparatus and ultraviolet irradiation apparatus. It can be performed.
About the 1st surface protective layer 5, you may use resin of the composition similar to the 2nd surface protective layer 6 of outermost layer, and you may use what changed the kind, composition, and ratio of resin separately.

As for the side of the pattern layer 2 of the decorative sheet 10, it is as described above. When the decorative sheet 10 is bonded to a wooden base material and used as a decorative board or further processed into a member, the base material sheet 1 made of resin is used. The back surface resin coat layer 8 which is a resin layer containing silica powder may be provided on the surface opposite to the pattern layer 2 of the front and back surfaces of the front and back surfaces to improve the adhesive strength with the wood substrate. As the adhesive used for the bonding, for example, an ethylene-vinyl acetate copolymer emulsion-type adhesive can be used.
The decorative sheet of the present embodiment having the above material structure has cleanability, scratch resistance as a flooring material, and bending workability, and is particularly suitable as a decorative sheet for a flooring material. In addition, the decorative sheet 10 of this embodiment is not limited to application to a flooring, but can be applied to a decorative sheet for a decorative material used around a floor surface such as a step board of a staircase.

EXAMPLES Hereinafter, the present invention will be described more specifically and in detail by examples, but the present invention is not limited only to these examples.
<Example 1>
A decorative sheet similar to that shown in FIG. 1 was prepared by the following material configuration and procedure.
(1) A colored polyethylene film (FZ manufactured by Riken Technos) was used as the base sheet.
(2) A wood grain pattern was printed with a gravure printing machine using gravure ink (Lamistor (registered trademark) manufactured by Toyo Ink Co., Ltd.) as a picture pattern layer.
(3) As the back surface resin coat layer, a two-component urethane primer resin containing silica powder was formed by gravure printing so that the thickness after drying was 1 μm.

(4) As an adhesive layer (not shown in FIG. 1), a coating amount after drying a two-component urethane resin adhesive having polyester polyol as a main ingredient and isophorone diisocyanate as a curing agent on the pattern layer is 2 g / m ² . It was coated to become.
(5) A maleic acid-modified polypropylene resin is used as the transparent adhesive layer (thickness 10 μm), and a polypropylene (prime polymer) having a main component isotactic pentad fraction of 95% as the transparent thermoplastic resin layer (thickness 115 μm). Used).
At this time, the transparent adhesive layer and the transparent thermoplastic resin layer were laminated by extruding both using an extruder so that the transparent adhesive layer was on the pattern layer side.

(6) As the first surface protective layer, a thermosetting polyfunctional acrylic urethane resin and silica internally added (manufactured by DIC Graphics) were applied at a thickness of 9 μm after drying.
Further, as the second surface protective layer, an ultraviolet curable polyfunctional urethane acrylate resin (manufactured by DIC Graphics) and a thermosetting polyfunctional acrylic urethane resin (manufactured by DIC Graphics) have a mixing ratio of 7: 3. And coated with a thickness of 6 μm after drying.
At that time, a thermosetting polyfunctional acrylic urethane resin and a second surface protective layer in which a matting agent made of silica is internally added to the first surface protective layer so that the 60-degree specular gloss value according to JIS Z 8741 is 20. An ultraviolet curable urethane acrylate resin internally containing a matting agent made of silica was added.
(7) Subsequently, the ultraviolet curable polyfunctional urethane acrylate resin was cured by ultraviolet irradiation to obtain a decorative sheet.

<Example 2>
The makeup of Example 2 in the same manner as in Example 1 except that the composition of the first surface protective layer and the second surface protective layer was changed so that the 60 ° specular gloss value according to JIS Z 8741 was 27. Created a sheet.
<Example 3>
The makeup of Example 3 in the same manner as in Example 1 except that the composition of the first surface protective layer and the second surface protective layer was changed so that the 60 ° specular gloss value according to JIS Z 8741 was 35. Created a sheet.

<Comparative Example 1>
The makeup of Comparative Example 1 in the same manner as in Example 1 except that the formulation of the first surface protective layer and the second surface protective layer was changed so that the 60 ° specular gloss value according to JIS Z 8741 was 8. Created a sheet.
<Comparative Example 2>
The makeup of Comparative Example 2 in the same manner as in Example 1 except that the composition of the first surface protective layer and the second surface protective layer was changed so that the 60 ° specular gloss value according to JIS Z 8741 was 40. Created a sheet.

<Creation of decorative panel for floor for evaluation>
The decorative sheets prepared in Examples 1 to 3, Comparative Example 1 and Comparative Example 2 were bonded to the surface of a 3 mm thick MDF (hardwood) to obtain a flooring material for evaluation.
A two-component aqueous emulsion adhesive (Rikabond (registered trademark) BA-10L / BA-11B = 100: 2.5 manufactured by Chuo Rika Kogyo Co., Ltd.) was used as an adhesive for bonding, and 100 g / m in a wet state. Bonding was performed at a coating amount of ² . Subsequently, it was cured for 24 hours to obtain a decorative board for flooring (a flooring material for evaluation).

<Evaluation items and evaluation methods>
The decorative panels for floors using the decorative sheets prepared according to the material configurations and procedures of Examples 1 to 3, Comparative Example 1 and Comparative Example 2 were tested and evaluated by the following evaluation items and evaluation methods.
(1) Measurement of 60-degree specular gloss value The test method was performed according to JIS Z 8741.
(2) Wiping property test “Tiger putty 120” (for both groundwork and finishing) made by Yoshino gypsum was manually applied to each flooring, cured for 1 hour, then wiped with a mop that had been wrung out of water, and then wiped dry.
Then, a sensory test was performed on 10 testers.
The evaluation indicators are as follows.
○: 7-10 people considered good △: 1-6 people considered good
×: 0 people who are good

(3) Designability test A sensory test was carried out on 10 examiners for the glossy designability as a flooring material.
The evaluation indicators are as follows.
○: 7-10 people considered good △: 1-6 people considered good
×: 0 people who are good

<Evaluation results>
The evaluation results are shown in Table 1.

In Examples 1 to 3, all evaluation items were evaluated as “◯”, and the 60-degree specular gloss value of the second surface protective layer showed good results in the range of 20 to 35. .
In Comparative Example 1 in which the 60 ° specular gloss value of the second surface protective layer was 8 relatively, it was confirmed that unevenness after wiping was easily noticeable. This indicates that the gloss value is effective in conspicuous wiping unevenness.
In Comparative Example 2 in which the 60 ° specular gloss value of the second surface protective layer is 40, the wiping resistance is excellent, but the pattern tends to be difficult to see due to the reflection of light, and the design is rejected. It can be seen that the 60 degree gloss value of 35 or less is effective to satisfy the design properties.

When these results are combined, it can be seen that when the 60 ° gloss value of the outermost surface is 20 or more and 35 or less, it is possible to provide a decorative sheet having cleanability and design as a flooring material. In particular, when the 60-degree specular gloss of Example 2 is 27, it seems that the balance between the cleaning property and the design property is good.
From the above results, according to the present invention, it was possible to verify that it was possible to provide a decorative sheet having cleaning properties and design properties as a flooring material.

DESCRIPTION OF SYMBOLS 1 ... Base material sheet 2 ... Pattern pattern layer 3 ... Transparent adhesive layer 4 ... Transparent thermoplastic resin layer 5 ... 1st surface protective layer 6 ... 2nd surface protective layer 7- ..Surface protective layer 8 ... Back side resin coating layer (resin layer)
10 ... Cosmetic sheet

Claims (3)

A pattern layer, a transparent adhesive layer, a transparent thermoplastic resin layer, and a surface protective layer are formed in this order on a resin base sheet.
The decorative sheet according to claim 1, wherein at least the outermost layer of the surface protective layer has a 60-degree specular gloss of 20 or more and 35 or less in accordance with JIS Z 8741.   2. The decorative sheet according to claim 1, wherein a layer located at least on the outermost surface of the surface protective layer is mainly composed of a mixture of an ultraviolet curable resin and a thermosetting resin.   The decorative sheet according to claim 1 or 2, wherein a resin layer containing silica powder is provided on a surface of the base sheet opposite to the pattern layer.

Images