Pattern printed wall paper

Abstract

To provide a wall paper excellent in fire resistance performance, and high in designability.SOLUTION: Whiteness expression having opacifying property is possible by being arranged on a wall paper of high designable saturation based on no white as a main constituent. Designability as a wall paper is upgraded using a white ink including titanium dioxide having a small organic mass which contributes to fire resistance performance as a main ingredient.

Description

[Technical field]

[0001] The present invention relates to wallpaper that can be provided with high designability without impairing fire retardant performance. [Background technology]

[0002] Wallpaper is often applied to the interior walls of buildings, and in recent years, not only white-based wallpapers but also highly stylish, saturated wallpapers have been proposed. However, when a design is created by overlaying a white expression on the surface of the laminate, regardless of the presence or absence of saturation, there are problems such as an increase in weight due to the increase in thickness of the coating film and limitations on the design due to the lack of hiding power of the white expression.

[0003] For design purposes, it is possible to create a white appearance by layering polyvinyl chloride resin paint, but there is also the problem that as the thickness of the paint film increases, the organic mass increases, reducing fire resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-63165 Summary of the Invention [Problem to be solved by the invention]

[0005] In wallpaper with a highly decorative design, it is desirable for the coating film to have hiding power even when the white layer placed on the surface is a thin film. In addition, the Building Standards Act requires that wallpaper used as a wall covering must be made of fireproof or semi-fireproof materials, which means that the organic mass in the wallpaper composition must be as small as possible.

[0006] In existing wallpaper, the white expression was generally achieved by using a polyvinyl chloride resin paint colored with titanium dioxide. Therefore, in order to achieve the conventional white expression, it was necessary to carry out a process in which parts of the upper decorative layer were left uncoated, leaving the white base layer exposed, or to rotary screen print a white polyvinyl chloride resin paint on top of the decorative layer.

[0007] The former has the drawback that it is difficult to express the sense of perspective when designing with the texture of white layered on the surface, while the latter has the drawback that the total coating thickness is large, making it impossible to reduce the organic mass of the wallpaper as a whole, and therefore exceeding the organic mass limit required to satisfy fire resistance performance.

[0008] Therefore, an object of the present invention is to provide wallpaper having excellent fire retardant performance by reducing the organic mass even when the wallpaper has a high design quality, and a method for producing the same. [Means for solving the problem]

[0009] As a result of extensive research into achieving the above object, the inventors discovered that use of a white ink with a small organic mass and sufficient hiding power makes it possible to achieve expression with even greater design quality, and thus completed the present invention. Effect of the Invention

[0010] According to the present invention, it is possible to provide a wallpaper having excellent fire resistance and capable of expressing a concealing white color by placing it on a layer with chroma, which did not exist before.

[0011] The wallpaper of the present invention will be described in detail below.

[0012] <Base material> The substrate can be any substrate used for wallpaper, with no restrictions, and typically a paper called backing paper is used. Wood pulp is usually used for the paper fibers, but any pulp material can be used, including non-wood pulp such as grass, bamboo, straw, and corn, synthetic fiber pulp such as polyester, rayon, and vinylon, and limestone, and at least one of the above can be appropriately selected. The basis weight is 50 g / m2. 2 More than 150g / m 2 The thickness of the substrate is, for example, 100 μm or more and 120 μm or less. The thickness of the substrate is not limited to 100 μm to 120 μm as long as it has a strength sufficient to support the substrate as wallpaper. The organic mass of the substrate is 85 g / m2 or less from the viewpoint of fire retardant performance. 2 Less than 65g / m 2 The following is the result.

[0013] <Base layer> The base layer contains at least a vinyl chloride resin and is laminated on the substrate. The base layer contains at least a plasticizer and a stabilizer in addition to the resin component. It may also contain a pigment, a foaming agent, a foaming assistant, a fungicide, a filler, etc., as appropriate. When a foaming agent is contained, the foaming agent foams, and the entire resin layer becomes foamed. The base layer may also contain additives to impart further functions. The base layer has an organic weight of 80g / m 2 More than 180g / m 2 Less than 80 g / m 2 More than 120g / m 2 The thickness of the base layer is set to 100 μm or more and 1000 μm or less after foaming, and is preferably 200 μm or less. The thickness of the base layer is not limited to 200 μm because it depends on the foamed state. The base layer is made of a coating film formed by coating on a substrate, and the coating film is appropriately selected to cover the entire surface or to cover only a part of the surface according to the design expression. Coating methods include screen printing, knife coating, nozzle coating, die coating, lip coating, comma coating, gravure printing, etc.

[0014] <Cosmetic layer> The decorative layer is formed to decorate the surface of the wallpaper and improve its design and functionality. The paint used is a polyvinyl chloride resin paint or a water-based paint. The polyvinyl chloride resin paint is composed of polyvinyl chloride resin, plasticizer, stabilizer, etc., just like the base layer. The water-based paint is preferably based on a water-based emulsion of acrylic resin, polyvinyl chloride resin, urethane resin, etc. As long as it satisfies the light resistance and color development generally required for wallpaper, and the safety requirements of the ingredients used (no heavy metals or sulfur compounds as pigments or additives, no formaldehyde, etc.), it may contain pigments, silicone resins, silica, anti-mold agents, etc. as appropriate for the desired design or function.

[0015] The decorative layer is usually laminated on a base layer. However, the order of lamination is not limited, as it depends on the design configuration. The decorative layer may be formed on a white ink layer, which will be described later, or a white ink layer may be formed on top of the decorative layer. There may be multiple decorative layers, and the total number of decorative layers is not limited.

[0016] For the basis weight, the total organic mass of the base layer and white ink layer is 80g / m for fireproofing purposes. 2 More than 185g / m 2 Less than 80 g / m 2 More than 125g / m 2 The thickness of the decorative layer is preferably 200 μm when using a vinyl chloride resin paint, and 5 μm when using a water-based paint. Note that the thickness of the decorative layer is not limited to 200 μm or 5 μm because it depends on the foaming state and printing method.

[0017] The decorative layer can be selected as a full coverage or partial coverage according to the design expression and the intended function. The coating method can be screen printing, knife coating, nozzle coating, die coating, lip coating, comma coating, gravure printing, etc. Furthermore, the printing method is not limited to the above-mentioned printing method, and any image forming means that has been conventionally known, such as a transfer method or a photosensitive resin method, can be applied.

[0018] <White ink layer> Titanium dioxide is one of the white pigments that make up white ink. Industrially produced titanium dioxide comes in rutile and anatase types, but the rutile type is preferable to ensure greater hiding power. In addition, since particle size is also thought to affect hiding power, a median diameter d50 of about 0.2 μm to 0.5 μm is preferable. Resins constituting the ink binder include acrylic resins, vinyl chloride resins, urethane resins, etc., but are not limited thereto as long as they are organic polymers. The white ink layer is also not particularly limited as long as it satisfies the generally required light resistance, color development, and safety requirements of the components used (such as not containing heavy metals or sulfur compounds as pigments or additives) as with the decorative layer, but is particularly preferably formed of a water-based ink from the standpoint of preventing the release of organic solvent volatile components into the air during processing and the sick house syndrome caused by remaining components. In addition, from the standpoint of concealing design expression, dyes and pigments other than titanium dioxide may be appropriately added.

[0019] Regarding the basis weight, the total organic mass of the base layer and the decorative layer is 80g / m2 for fireproofing performance. 2 More than 185g / m 2 Less than 80 g / m 2 More than 125g / m 2 The thickness of the white ink layer alone is set as follows. As long as the concealment property can be ensured, it is advantageous to have a thin thickness, but it is preferably, for example, 10 μm. The thickness of the white ink layer is not limited to 10 μm because it depends on the printing method, etc.

[0020] As for the printing method for the white ink layer, any conventionally known image forming means can be used, similar to the printing method for the decorative layer. In addition, viscosity adjusters such as thickeners, neutralizing agents, defoamers, preservatives, and anti-mold agents can be added as appropriate to the white ink formulation in order to match the printing method or to add other designs, functions, or effects.

[0021] In order to enhance the design and functionality, a decorative layer may be placed on the white ink layer, and the application of the white ink layer will not be hindered. In addition, embossing may be performed in the same manner as known wallpapers.

[0022] Wallpaper is a JIS-certified product and must meet the requirements set out in JIS-A-6921:2014.

[0023] Fireproof certification conditions are the conditions under which a building material must meet the technical standards of the Building Standards Act and be certified by the Minister of Land, Infrastructure, Transport and Tourism as having sufficient fireproof performance. Materials that have been certified in this way are called fireproof materials. Fire retardant materials must satisfy the following three requirements: 1. They must be non-combustible. 2. They must not deform, melt, crack or cause any other damage that would be detrimental to fire prevention. 3. They must not emit smoke or gas that would be detrimental to evacuation. In other words, fire-resistant certified wallpaper is wallpaper that has the ability to prevent the spread of fire in the event of a fire, deformation, secondary damage caused by gas, etc. The fire resistance of wallpaper does not depend on the wallpaper alone, but also on the base building materials it is combined with and how it is applied. Therefore, in order to reduce the effect of the base building materials on wallpaper alone, it is preferable for the wallpaper to be certified as a non-combustible material rather than a semi-non-combustible material.

[0024] Regarding fire resistance, there is a view that the total organic mass of wallpaper should be below a certain mass, and as a non-combustible material, the organic mass of the entire wallpaper should be 190g / m 2 The following is a semi-noncombustible material with an organic mass of 251 g / m 2 The following needs to be designed: [Brief description of the drawings]

[0025] [Figure 1] 1 is a schematic diagram showing a cross section of a wallpaper according to the present invention. [Explanation of symbols]

[0026] 1 Base material 2. Base layer 3. Decorative layer 4 White ink layer DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Wallpaper made of a layered structure. EXAMPLES EXAMPLES

[0028] The backing paper (thickness 0.1 mm, basis weight 65 g / m2) is made of natural pulp only and does not contain synthetic resin. 2 , organic mass ratio 100.0%) and a base layer (thickness 0.1 mm after drying, thickness 0.2 mm after heating and foaming, basis weight 160 g / m 2 The entire surface was coated with a coating solution of 64.1% organic matter (64.1% organic mass ratio in non-volatile matter) by doctor coating and dried at 190°C. Further, a decorative layer (grammage 1g / m 2 The entire surface of the substrate was coated with a coating of 75.0% organic matter (75.0% organic matter in the nonvolatile content) by gravure printing and dried at 130°C.

[0029] The raw material for the white ink layer 4 is an ink prepared by adding 30 parts by mass of an aqueous dispersion of titanium dioxide prepared by dispersing the titanium dioxide in water using a dispersant to a water dispersion of synthetic resin ("Hydrich WP Extender" manufactured by Dainichi Seikagaku Co., Ltd.) to the water dispersion and stirring to mix. This was used as a water-based white ink, and the decorative layer was printed on the laminate, followed by three layers of white ink (plate aperture ratio 38.8% + 22.8% + 6.3%, total coating weight 13.6g / m 2 , dry basis weight 5.5g / m 2The mixture was applied by screen printing to a thickness of 10 μm after drying, with an organic mass ratio of 51.8% in the non-volatile content, and dried at 165° C. Thereafter, the mixture was heated at 180° C. and foamed, which was taken as Example 1. EXAMPLES

[0030] The same backing paper as in Example 1 was coated with a base layer (thickness after drying: 0.1 mm, thickness after heating: 0.4 mm, basis weight: 155 g / m 2 A decorative layer (72.7% organic mass ratio) was applied to the entire surface by doctor coating and dried at 190°C. 2 , dry basis weight 1g / m 2 A white ink layer (opening ratio 29.1%, coating weight 3.5 g / m2) was applied to the front side of the paper using gravure printing. 2 , dry basis weight 1.4g / m 2 The resulting mixture was coated by gravure printing with a thickness of 3 μm when dried and with an organic mass ratio of 51.8% in the non-volatile content, and dried at 130° C. Thereafter, the mixture was heated at 220° C. and foamed, resulting in Example 2.

[0031] <Comparative Example 1> The backing paper (thickness 0.1 mm, basis weight 60 g / m) is made of natural pulp only and does not contain synthetic resin. 2 , organic mass ratio 100.0%) on a base layer (thickness 0.1 mm after drying, 0.2 mm after heating, weight 120 g / m 2 The coating was then applied over the entire surface by screen printing and dried at 160°C. On the surface side, there is a decorative layer (opening ratio 77.1%, thickness after drying 0.1 mm, after heating 0.2 mm, basis weight 85 g / m 2 The mixture was coated with a coating solution of 64.7% by weight (organic mass ratio: 64.7%) by screen printing and dried at 160° C. Thereafter, the mixture was heated at 190° C. and foamed, which was used as Comparative Example 1.

[0032] The hiding power of the white ink layer is evaluated by the following method. In Examples 1 and 2 and Comparative Example 1, a paint colored with a pigment was used for the base layer that was applied over the entire surface, which was the lower layer. Furthermore, in each example, samples were prepared without adding any dye or pigment other than titanium dioxide to the white ink layer or decorative layer that was the upper layer. For these samples, a sensory evaluation was performed by visual judgment on the extent to which the color of the lower colored base layer could be seen through the white ink layer in Examples 1 and 2, and through the upper white vinyl chloride resin paint in Comparative Example 1.

[0033] [Evaluation Criteria] 5: Strong hiding power, no visible color underneath 4: It has a strong hiding power, making it difficult to see the color underneath 3: It has good hiding power and looks a little cloudy, but the color underneath can be seen 2: Slight hiding power is felt, but the color underneath is clearly visible 1: No hiding power at all In addition, if the evaluation score was 5, 4, or 3, it was deemed to be at a level suitable for practical use and was deemed to have passed.

[0034] [Evaluation Results] The evaluation results are shown in Table 1.

[0035] [Table 1] *The numbers in the white layer type column indicate the ratio of 75% titanium dioxide water dispersion to 100% ink binder for the white ink layer. For polyvinyl chloride resin paint, the ratio is the ratio of titanium dioxide to 100% polyvinyl chloride resin.

[0036] Furthermore, the concealing property of the white ink layer is also measured by the following method. <Examples 3 to 9, Comparative Example 2> A thin film of vinyl chloride resin paint is applied to the backing paper using the doctor coating method, and dried at 190°C to produce a coating of 200 g / m 2A base layer of the above formula was obtained. An acrylic ester copolymer emulsion surface treatment agent was then laminated on the base layer by gravure printing and dried at 130°C, after which each color of cyan, magenta, yellow, and black was solid printed using an inkjet printer (Mimaki CJV30-100), and a white ink layer was applied to part of the printed area by gravure printing to cover it, and dried at 130°C. The resulting mixture was then foamed at 215°C.

[0037] <Comparative Examples 3 to 6> Instead of applying a white ink layer at the end in Example 3, the ink binder alone or a vinyl chloride resin paint was applied to obtain a measurement object. The ink binder was applied by gravure printing, and the vinyl chloride resin paint was applied by screen printing.

[0038] The measured objects obtained above were measured with a color difference meter (Spectrophotometer CM-36dG manufactured by Konica Minolta Japan, Inc.) using the overlapping area 9 of only the base layer and the area 10 covered with a white ink layer as shown in Figure 2 as a reference, and the overlapping areas 5, 6, 7, and 8 of the inkjet printing of the base layer and each of the colors cyan, magenta, yellow, and black were measured for the overlapping areas 10 covered with the white ink layer, ink binder alone, or vinyl chloride resin paint, and ΔE was calculated from the measured values ​​of these two points. The following judgments were made from the ΔE value.

[0039] FIG. 2 is an explanatory diagram seen from above showing the positions of measurements using a color difference meter. [Explanation of symbols]

[0040] 2. Base layer 4 White ink layer 5 Cyan inkjet printing 6 Magenta printed area by inkjet printing 7 Yellow printed area by inkjet printing 8 Black inkjet printing 9 Base layer only, not inkjet printed 10 Parts covered with a white ink layer on top of inkjet printing

[0041] Sensory evaluation criteria are 5: Strong hiding power, no visible color underneath 4: It has a strong hiding power, making it difficult to see the color underneath 3: It has good hiding power and looks a little cloudy, but the color underneath can be seen 2: Slight hiding power is felt, but the color underneath is clearly visible 1: No hiding power at all The judgment was made by visual inspection.

[0042] The criteria are ○: When ΔE is less than 44 △: When ΔE is between 44 and 54 ×: ΔE is in the range of 54 or more In addition, if the evaluation was "○" or "△", it was considered to have passed.

[0043] [Evaluation Results] The evaluation results are shown in Tables 2 and 3.

[0044] [Table 2]

[0045] [Table 3] *The numbers in the white layer type column indicate the ratio of 75% titanium dioxide water dispersion to 100% ink binder for the white ink layer. For polyvinyl chloride resin paint, the ratio is the ratio of titanium dioxide to 100% polyvinyl chloride resin.

[0046] Table 4 also summarizes the organic mass when the same amount of paint is applied.

[0047] [Table 4]

[0048] The results of Tables 2, 3 and 4 were extracted and further evaluated comprehensively, and are shown in Table 5. The criteria for fire resistance are based on organic mass. ○: If less than 40 △: If it is between 40 and 80 ×: If it is in the range of 80 or more In addition, if the evaluation was "○" or "△", it was considered to have passed.

[0049] [Table 5] *Although the determination of organic mass is fundamentally dependent on the number of layers, we took into consideration the fact that for a single layer, if the value is small, there is greater freedom in layering.

[0050] As shown in Tables 2, 3, and 4, it can be seen that even though the white ink layer is a thin film, it has a certain degree of hiding power, making it practical. At the same time, by obtaining a coating film that is not polyvinyl chloride resin, the organic mass is reduced and a certain degree of fire resistance is also achieved. As shown in Table 4, even when the same volume of paint is applied as polyvinyl chloride resin paint, the white ink layer can keep the organic mass lower, demonstrating its advantage in terms of fire resistance. Therefore, when a comprehensive assessment is made, the results are as shown in Table 5, which shows that the material has both the concealment properties of the lower layer and fire resistance. [Industrial Applicability]

[0051] Although the embodiment and examples of the present invention have been described above, according to the present invention, wallpaper with high design quality can be obtained without impairing fire resistance. Furthermore, the wallpaper of the present invention is not limited to the above embodiment and examples, and various modifications are possible within the scope of the invention without impairing its characteristics.

Claims

1. This wallpaper is characterized in that it has a base material of paper and has at least one base layer and one or more white ink layers applied to at least one surface of the paper.

2. 2. The wallpaper according to claim 1, wherein the white ink layer is made of at least one synthetic resin selected from the group consisting of polyvinyl chloride resin, acrylic resin, and urethane resin, and titanium dioxide.

3. 3. Wallpaper according to claim 1 or 2, characterized in that it satisfies fire-resistant certification requirements.

4. A paint for forming a white ink layer used in the wallpaper according to any one of claims 1 to 3.

5. 4. A method for producing wallpaper according to claim 1, wherein the paint is printed on a surface layer to produce wallpaper that satisfies fireproof certification conditions.

Images