Wallpaper

Abstract

To provide a wallpaper made from recycled vinyl chloride mixed with paper components, having suppressed deterioration of light fastness.SOLUTION: The wallpaper includes a base material 1 made of paper and a vinyl chloride resin layer 2 formed on the base material 1. The vinyl chloride resin layer 2 includes a recycled vinyl chloride partially separated from the base material 1 of a used wallpaper, and titanium oxide. The content ratio of titanium oxide to the recycled vinyl chloride is 10 wt.% or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to wallpaper, and is particularly suitable for use in wallpaper made from recycled vinyl chloride obtained by removing the paper components from used wallpaper. [Background technology]

[0002] Conventionally, vinyl chloride wallpaper, in which a vinyl chloride resin layer is laminated on a substrate, has been widely used as a wall covering material to be pasted on the walls of houses, etc. As shown in Fig. 6, conventional wallpaper 100 has a vinyl chloride resin layer 102 formed on a paper substrate 101 called backing paper, and a decorative layer is provided on this vinyl chloride resin layer 102 by printing, film lamination, etc., or the vinyl chloride resin layer 102 is foamed and embossed to provide a concave-convex pattern.

[0003] The backing paper 101 is provided to prevent the wall surface from being damaged when the wallpaper 100, once pasted on the wall, is peeled off for replacement or the like. In other words, when attempting to peel the wallpaper 100 from the wall, the backing paper 101 is peeled off in a thin layer, thereby preventing the wall surface from being damaged. After the old wallpaper 100 has been peeled off, a thin cross section of the backing paper 101 remains on the wall surface, and new wallpaper 100 is pasted on top of this.

[0004] This type of wallpaper 100 is produced by mixing vinyl chloride with a plasticizer, heating it to 100-250°C to melt it, and applying the molten vinyl chloride to backing paper 101. This causes the vinyl chloride to permeate the paper fibers of backing paper 101, and a vinyl chloride resin layer 102 is formed on top of backing paper 101 in an integrated and inseparable manner.

[0005] PVC is easy to process and does not deteriorate easily over time, so it is used in many products and has been widely used as a material for wall coverings. However, PVC has the disadvantage that it produces dioxins and large amounts of carbon dioxide when burned. Therefore, it is desirable to recycle PVC instead of incinerating it.

[0006] However, in the case of vinyl chloride wallpaper, when the wallpaper 100 is peeled off, the cross section of the backing paper 101 remains stuck to the vinyl chloride resin layer 102. Because vinyl chloride soaks into the paper fibers, it has been extremely difficult to separate the soaked vinyl chloride from the backing paper 101. As a result, with the growing concern over the global environmental issues in recent years, there has been a problem in that unnecessary vinyl chloride wallpaper simply ends up as industrial waste.

[0007] In response to these problems, wallpaper that allows recycling is known (see, for example, Patent Document 1). The wallpaper described in Patent Document 1 is constructed by forming a PVC paper layer made of a composite material of a paper substrate and vinyl chloride on top of the substrate. The composite material of the PVC paper layer is created by dissolving used wallpaper that has been peeled off. With this construction, the wallpaper that has been peeled off from the wall can be recycled as it is to be used as a composite material, making it possible to solve the global environmental problems without incurring large costs. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 3917137 Summary of the Invention [Problem to be solved by the invention]

[0009] In recent years, further development has led to the provision of technology that separates the paper and vinyl chloride from wallpaper 100 that has been peeled off from a wall (where the cross section of backing paper 101 is attached to the vinyl chloride resin layer 102). Using this technology, it is possible to further remove most of the cross section of backing paper 101 from wallpaper 100 that has been peeled off from a wall, and recycle the vinyl chloride with a reduced paper content (the mixture rate is at most about 5%).

[0010] However, if the separated polyvinyl chloride still contains even a small amount of paper, recycling it to produce wallpaper will impair the lightfastness of the wallpaper. Lightfastness refers to the resistance of wallpaper to fading due to exposure to light over time. In other words, if polyvinyl chloride containing paper components is recycled to produce wallpaper, there is a problem in that the lightfastness will be reduced compared to non-recycled wallpaper.

[0011] The present invention has been made to solve such problems, and has an object to suppress the decrease in lightfastness when polyvinyl chloride containing paper components is recycled to produce wallpaper. [Means for solving the problem]

[0012] In order to solve the above-mentioned problems, the wallpaper of the present invention comprises a paper substrate and a polyvinyl chloride resin layer formed on the substrate, the polyvinyl chloride resin layer containing recycled polyvinyl chloride, which is recycled by separating part of the substrate from used wallpaper, and titanium oxide, and the titanium oxide content relative to the recycled polyvinyl chloride is 10% by weight or more. Effect of the Invention

[0013] According to the present invention configured as described above, it is possible to suppress the decrease in light resistance when polyvinyl chloride containing paper components is recycled to produce wallpaper. [Brief description of the drawings]

[0014] [Figure 1]FIG. 1 is a diagram showing an example of a wallpaper configuration according to the present embodiment. [Diagram 2] 1 is a graph showing the results of a discoloration test for Examples 1 to 3 and Comparative Examples 1 to 4. [Diagram 3] 1 is a graph showing the results of a discoloration test for Examples 4 to 6. [Figure 4] 11A and 11B are diagrams illustrating another example of the configuration of wallpaper according to the present embodiment. [Diagram 5] 1 is a graph showing the results of a discoloration test for Examples 7 to 10. [Figure 6] FIG. 1 is a diagram showing an example of a configuration of a conventional wallpaper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of a wallpaper 10 according to this embodiment. As shown in FIG. 1, the wallpaper 10 of this embodiment is configured to include a paper substrate 1 used as a backing paper, and a vinyl chloride resin layer 2 formed on the substrate 1. The vinyl chloride resin layer 2 may be foamed and embossed to provide an uneven pattern. Alternatively, a pattern layer may be provided on the vinyl chloride resin layer 2 by printing or the like. Note that FIG. 1 is a schematic diagram, and is not illustrated to reflect the actual ratio of the thickness of the substrate 1 to the vinyl chloride resin layer 2.

[0016] Examples of materials for the substrate 1 include various paper materials such as coated paper, kenaf paper, plain paper, recycled paper, Japanese paper, fine paper, crepe paper, glassine paper, tracing paper, cast paper, coated paper, and synthetic paper.

[0017] The vinyl chloride resin layer 2 contains vinyl chloride recycled by separating a portion of the base material 1 from used wallpaper (hereinafter referred to as recycled vinyl chloride), and titanium oxide. Recycled vinyl chloride is vinyl chloride obtained by further removing most of the cross section of the base material 1 from wallpaper 10 that has been peeled off a wall, so that the paper component content is approximately 5% or less. The used wallpaper may be the wallpaper 10 of this embodiment, or may be conventional, ordinary wallpaper.

[0018] In the vinyl chloride resin layer 2, the content ratio of titanium oxide to the recycled vinyl chloride is 10% by weight or more. In other words, when the weight of the recycled vinyl chloride is taken as "100", the weight of titanium oxide is "10" or more. By configuring the wallpaper 10 in this way, it is possible to suppress deterioration of the light resistance of the wallpaper 10 and satisfy the JIS standard for color fading.

[0019] An example of the wallpaper 10 according to this embodiment will be described below.

[0020] <Examples 1 to 3> In Examples 1 to 3, the vinyl chloride resin layer 2 of the wallpaper 10 contains a stabilizer in addition to recycled vinyl chloride and titanium oxide. A barium zinc-based stabilizer was used as the stabilizer. In Examples 1 to 3, recycled vinyl chloride that had been peeled off a wall and the paper components separated was mixed with titanium oxide and a stabilizer in the ratios shown in Table 1 below to create a compounded raw material for the vinyl chloride resin layer 2. The compounded raw material for the vinyl chloride resin layer 2 was then applied to the substrate 1 to construct the wallpaper 10.

[0021] [Table 1]

[0022] In Example 1, 10 parts by weight of titanium oxide (TITONE R-25 manufactured by Sakai Chemical Industry Co., Ltd.) and 6 parts by weight of a barium zinc-based stabilizer (LFX-97JY manufactured by Daikyo Kasei Kogyo Co., Ltd.) were blended with 100 parts by weight of recycled vinyl chloride to form the vinyl chloride resin layer 2. In Example 2, 15 parts by weight of titanium oxide and 6 parts by weight of a barium zinc-based stabilizer were blended with 100 parts by weight of recycled vinyl chloride to form the vinyl chloride resin layer 2. In Example 3, 20 parts by weight of titanium oxide and 6 parts by weight of a barium zinc-based stabilizer were blended with 100 parts by weight of recycled vinyl chloride to form the vinyl chloride resin layer 2.

[0023] <Comparative Examples 1 to 4> In Comparative Example 1, the vinyl chloride resin layer of the wallpaper contains recycled vinyl chloride and a stabilizer, but does not contain titanium oxide. The vinyl chloride resin layer of Comparative Example 1 is constituted by blending 6 parts by weight of a barium zinc-based stabilizer with 100 parts by weight of recycled vinyl chloride. In Comparative Examples 2 to 4, the vinyl chloride resin layer of the wallpaper contains titanium oxide in addition to recycled vinyl chloride and a stabilizer, as with the wallpaper 10 of this embodiment. In Comparative Examples 2 to 4, the blending amounts of titanium oxide with respect to 100 parts by weight of recycled vinyl chloride are 1 part by weight, 3 parts by weight, and 5 parts by weight, respectively.

[0024] The color fading tests for Examples 1 to 3 and Comparative Examples 1 to 4 were conducted based on "Wallpaper" in JISA6921:2014. Specifically, the polyvinyl chloride resin layer was irradiated with light continuously for 40 hours using the carbon arc method, and the color difference between the irradiated polyvinyl chloride resin layer and the non-irradiated polyvinyl chloride resin layer was visually determined, and ΔE was measured. If the color difference ΔE was 2.0+0.3 (0.3 is a margin value considering error) or less, it was determined that the JIS color fading standard was met.

[0025] Fig. 2 is a graph showing the results of the discoloration test for Examples 1 to 3 and Comparative Examples 1 to 4. The horizontal axis represents the amount of titanium oxide blended, and the vertical axis represents the color difference ΔE. As shown in Fig. 2, Examples 1 to 3, in which the amount of titanium oxide blended per 100 parts by weight of recycled vinyl chloride was 10 parts by weight or more, met the JIS discoloration standard, whereas Comparative Examples 1 to 4, in which the amount of titanium oxide blended per 100 parts by weight of recycled vinyl chloride was less than 10 parts by weight, did not meet the JIS discoloration standard.

[0026] <Examples 4 to 6> In Examples 4 to 6, the vinyl chloride resin layer 2 of the wallpaper 10 further contains a colored concealing material in addition to recycled vinyl chloride, titanium oxide, and a stabilizer (barium zinc-based). Calcium carbonate was used as the colored concealing material. In Examples 4 to 6, titanium oxide, a stabilizer, and a colored concealing material were mixed with recycled vinyl chloride in the ratios shown in Table 2 below to prepare a compounded raw material for the vinyl chloride resin layer 2. The compounded raw material for the vinyl chloride resin layer 2 was then applied to the substrate 1 to construct the wallpaper 10. Table 2 also shows Example 1, which does not contain a colored concealing material.

[0027] [Table 2]

[0028] As shown in Table 2, in Examples 4 to 6, the amounts of titanium oxide and stabilizer per 100 parts by weight of recycled vinyl chloride were 10 parts by weight and 6 parts by weight, respectively, which are the same as those in the above-mentioned Examples 1 to 3. In addition, in Examples 4 to 6, the amounts of colored concealing material per 100 parts by weight of recycled vinyl chloride were 0.005 parts by weight, 0.01 parts by weight, and 0.02 parts by weight, respectively.

[0029] For these Examples 4 to 6, a discoloration test was also conducted based on "Wallpaper" of JISA6921:2014. FIG. 3 is a graph showing the results of the discoloration test for Examples 4 to 6. The horizontal axis is the blended amount of titanium oxide, and the vertical axis is the color difference ΔE. As shown in FIG. 3, in Examples 4 to 6 in which the vinyl chloride resin layer 2 was formed by further blending a colored concealing material, the color difference ΔE was smaller than in Example 1 in which no colored concealing material was blended, and all of them had improved light resistance.

[0030] <Examples 7 to 10> In Examples 7 to 10, the wallpaper 10' further includes a white coating layer 3 formed on the vinyl chloride resin layer 2 constructed in the same manner as in Examples 1, 4 to 6, as shown in FIG. 4. A white ink (VSFW701 white, manufactured by Dainichiseika Chemical Industry Co., Ltd.) was used as the white coating layer 3. In Examples 7 to 10, titanium oxide, a stabilizer, and a colored concealing material were mixed with recycled vinyl chloride in the ratios shown in Table 3 below to prepare a blended raw material for the vinyl chloride resin layer 2. This blending is the same as Table 2. The blended raw material was then applied to the substrate 1 to form the vinyl chloride resin layer 2, and the white coating layer 3 was then formed on the vinyl chloride resin layer 2 to construct the wallpaper 10'.

[0031] [Table 3]

[0032] A discoloration test was also conducted for these Examples 7 to 10 based on "Wallpaper" of JISA6921:2014. FIG. 5 is a graph showing the results of the discoloration test for Examples 7 to 10. The horizontal axis is the amount of titanium oxide blended, and the vertical axis is the color difference ΔE. As can be seen by comparing FIG. 3 with FIG. 5, in Examples 7 to 10 in which a white coating layer 3 is further formed on the vinyl chloride resin layer 2 shown in Examples 1, 4 to 6, the color difference ΔE is smaller than that in Examples 1, 4 to 6 in which a white coating layer 3 is not formed, and all of them have improved light resistance.

[0033] The wallpapers 10 and 10' of the present embodiment have been described above using Examples 1 to 10, but the technical scope of the present invention is not limited to the above Examples 1 to 10. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above Examples 1 to 10. Examples with such modifications or improvements can also be included in the technical scope of the present invention.

[0034] For example, in the above Examples 1 to 10, a barium zinc-based stabilizer was used, but the present invention is not limited thereto. For example, organic phosphorus compounds, organic tin-based stabilizers such as dibutyltin laurate, dibutyltin maleate, and dibutyltin mercapto, lead-based stabilizers such as lead stearate and lead benzoate, organic acid compounds such as calcium zinc-based stabilizers, metal soaps, pure organic stabilizing assistants such as epoxy plasticizers and chelators, barium zinc-based stabilizers, inorganic stabilizers such as hydrotalcite and zeolite, etc. may also be used.

[0035] The vinyl chloride resin layer 2 may further contain a plasticizer or a filler. Examples of the plasticizer that can be used include general fatty acid ester plasticizers such as dioctyl phthalate (DOP), dioctyl adipate (DOA), dioctyl sebacate (DOS), dioctyl azelaate (DOZ), and glycerin fatty acid esters; trimellitic acid ester plasticizers such as trioctyl trimellitate (TOTM); polyester plasticizers such as polypropylene adipate; and sebacic acid plasticizers such as polymer plasticizers; general plasticizers such as chlorinated paraffin; phosphate ester plasticizers such as tricresyl phosphate (TCF), trixylyl phosphate [TXP], tris(isopropylphenyl)phosphate, triptyl phosphate, triethyl phosphate, triphenyl phosphate, and triethylphenyl phosphate; epoxidized products of phosphate; and epoxy resins.

[0036] Examples of the filler that can be used include calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, talc, silica, clay, and calcium silicate.

[0037] The vinyl chloride resin layer 2 may contain a foaming agent for foaming the resin and a diluent for adjusting the fluidity of the resin. The vinyl chloride resin layer 2 may contain a processing aid such as an acrylic resin for the purpose of promoting gelation and improving melt tension. The vinyl chloride resin layer 2 may contain waste sol for the purpose of promoting gelation and improving the thin film effect.

[0038] Although an oil-based white ink was used in the above Examples 7 to 10, a water-based ink may also be used. The white ink may contain resin (such as vinyl chloride, acrylic, or vinyl acetate), titanium oxide, calcium carbonate, silica, or the like. [Explanation of symbols]

[0039] 1 Base material 2 PVC resin layer 3 White coating layer 10,10' wallpaper

Claims

1. A paper substrate; A vinyl chloride resin layer formed on the substrate, The vinyl chloride resin layer contains recycled vinyl chloride obtained by separating a part of the base material from used wallpaper and titanium oxide, and the content ratio of the titanium oxide to the recycled vinyl chloride is 10% by weight or more. A wallpaper characterized by:

2. 2. The wallpaper according to claim 1, wherein the polyvinyl chloride resin layer further comprises a colored hiding material.

3. 3. The wallpaper according to claim 1, further comprising a white coating layer formed on the polyvinyl chloride resin layer.

Images