JP2021175616A - Raw fabric for wall paper, foamed wall paper and method for producing foamed wall paper - Google Patents

Abstract

To provide a raw fabric for wall paper that resists the discoloration caused by starch.SOLUTION: A raw fabric for wall paper has a structure in which: on a base material 2, a foaming agent-containing resin layer 4 that contains a foaming agent, and a discoloration prevention functional layer 7 are stacked in the stated order, where the discoloration prevention functional layer contains an additive containing at least one selected from the group consisting of zinc ions, pyrithione ions and salts thereof. The foaming agent-containing resin layer 4 is resin-crosslinked by chemical crosslinking or irradiation.SELECTED DRAWING: Figure 1

Description

The present invention relates to a raw material for wallpaper, a foam wallpaper, and a method for manufacturing a foam wallpaper.

Conventionally, as an adhesive for wallpaper used for wall decoration of buildings, for example, a starch-based water-based adhesive is widely used. However, the starch-based water-based adhesive has a problem that it adheres to the surface of the wallpaper, and when the starch discolors with time, the wallpaper looks discolored.
On the other hand, for example, in the techniques described in Patent Documents 1 and 2, an aqueous adhesive to which a compound compound is added is used. Further, for example, in the technique described in Example 3, a cutting underlay tape for preventing adhesion of a starch-based water-based adhesive to wallpaper is used.

Japanese Unexamined Patent Publication No. 6-47875 Japanese Unexamined Patent Publication No. 2000-255011 Japanese Unexamined Patent Publication No. 2001-347611

However, the techniques described in Patent Documents 1 to 3 are not widely adopted by wallpaper contractors because they are expensive or complicated. Therefore, the above-mentioned problem, that is, the problem that the wallpaper looks as if it has been discolored due to the discoloration of the starch system has not been solved.
The present invention focuses on the above points, and an object of the present invention is to provide a raw fabric for wallpaper, a foam wallpaper, and a method for producing foam wallpaper, which can suppress discoloration caused by starch.

In order to solve the above problems, one aspect of the present invention is at least one selected from the group consisting of a foaming agent-containing resin layer containing a foaming agent, zinc ions, pyrithion ions and salts thereof on a substrate. A functional layer containing an additive containing seeds is laminated, and the foaming agent-containing resin layer is resin-crosslinked by a chemical cross-linking method or irradiation.

According to one aspect of the present invention, the zinc ions and pyrithione ions contained in the additive are separated to bias the pH of the water-based adhesive adhering to the surface side of the foamed wallpaper to the acidic side, so that the water-based adhesive is adhered. The starch contained in the agent can be decomposed, and the discoloration caused by the starch can be suppressed.

It is an end view which shows the structure of the original fabric for wallpaper which concerns on embodiment. It is an end view which shows the structure of the original fabric for wallpaper which concerns on a modification. It is an end view which shows the structure of the foam wallpaper which concerns on embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings.
Here, the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiments shown below exemplify a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, etc. of the constituent parts as follows. It is not specific to the thing. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

(Wallpaper original fabric 1)
As shown in FIG. 1, the wallpaper raw fabric 1 of the present embodiment has a first non-foaming layer 3 (non-foaming agent-containing resin layer), a foaming agent-containing resin layer 4, and a second non-foaming layer on the base material 2. The foam layer 5 (non-foaming agent-containing resin layer), the pattern layer 6, and the discoloration prevention function layer 7 are formed in this order. If necessary, another layer may be formed between the pattern layer 6 and the discoloration prevention function layer 7, between the base material 2 and the first non-foaming layer 3. For example, as shown in FIG. 2, even if an intermediate layer 8 for increasing the adhesiveness between the pattern pattern layer 6 and the discoloration prevention function layer 7 is formed between the pattern pattern layer 6 and the discoloration prevention function layer 7. good. Further, either the first non-foaming layer 3 or the second non-foaming layer 5 may be omitted.

(Base material 2)
The base material 2 is not particularly limited, and a known fibrous sheet can be used. Examples of the fibrous sheet include general paper for wallpaper in which a pulp-based sheet is sized with a known sizing agent, flame-retardant paper in which a pulp-based sheet is treated with a flame retardant such as guanidine sulfamate and guadinin phosphate, and water. Inorganic paper, high-quality paper, and thin paper containing inorganic additives such as aluminum oxide and magnesium hydroxide can be used. In addition, those corresponding to non-woven fabrics are also included. The basis weight of the substrate 2, for example, preferably about 50 to 300 g / m ^2, 50 to 120 / m ² is more preferable.

(First non-foaming layer 3)
The first non-foaming layer 3 is a layer for improving the adhesion between the base material 2 and the foaming agent-containing resin layer 4. As the resin component of the first non-foaming layer 3, for example, an ethylene-vinyl acetate copolymer can be used. The first non-foaming layer 3 may contain a known additive in addition to the resin component, but it is preferably blended so that the content of the resin component is 70 to 100% by weight. The thickness of the first non-foamed layer 3 is preferably 10 to 50 μm, more preferably 10 to 20 μm.

(Foamant-containing resin layer 4)
The foaming agent-containing resin layer 4 is a resin layer containing a foaming agent and foamed by heating. The foaming agent-containing resin layer 4 is obtained by melt-extruding a resin composition containing a foaming agent. As the resin component, for example, a vinyl chloride resin or an olefin resin can be used. In particular, in consideration of improvement of durability, embossing, etc., an olefin resin is preferable, and an ethylene resin is more preferable.

As the ethylene-based resin, for example, it is preferable to contain at least one kind of polyethylene, an ethylene copolymer containing ethylene and a component other than ethylene as a monomer. As the polyethylene, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene can be used. In particular, low density polyethylene is preferable.

Examples of the ethylene copolymer include an ethylene-vinyl acetate copolymer, an ethylene-methyl methacrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methacrylic acid copolymer, and ethylene. The −α-olefin copolymer can be used alone or in combination of two or more. In particular, at least one of an ethylene-vinyl acetate copolymer, an ethylene-methyl methacrylate copolymer and an ethylene-methacrylic acid copolymer is preferable, and when these are used in combination with another resin, both ethylene and vinyl acetate are used. At least one of the polymer, the ethylene-methylmethacrylate copolymer and the ethylene-methacrylic acid copolymer is preferably 70% by mass or more, more preferably 80% by mass or more.

Further, as the foaming agent, for example, an azo compound, ammonium carbonate, ammonium bicarbonate, and ammonium nitrite can be used. As the azo compound, for example, azodicarbonamide (ADCA), azobisformamide and the like are preferable. The content of the foaming agent is preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin component in consideration of the foaming ratio. Further, the foaming agent-containing resin layer 4 is resin-crosslinked by a chemical cross-linking method or irradiation. The thickness of the foaming agent-containing resin layer 4 is preferably 10 to 50 μm, more preferably 10 to 20 μm.

(Second non-foaming layer 5)
The second non-foaming layer 5 is a layer for protecting the foaming agent-containing resin layer 4. The resin component of the second non-foaming layer 5 includes, for example, a polymer obtained as a monomer of at least one of acrylic acid (CH2 = CHCOOH) and methacrylic acid (CH2 = C (CH3) COOH) as a resin component. A resin composition can be used. In particular, a copolymer obtained by combining ethylene with at least one monomer of acrylic acid and methacrylic acid is preferable.

More specifically, it is desirable to use at least one of EMAA, an ethylene-acrylic acid copolymer and an ionomer resin. As the ionomer resin, a resin having a structure in which the molecules of the EMAA and / or the ethylene-acrylic acid copolymer are intermolecularly bonded with ions of a metal such as sodium or zinc can be used. When such a resin component is used, a strong layer due to hydrogen bonds or the like in the resin can be formed, so that excellent scratch resistance, abrasion resistance and the like can be obtained. As these, known or commercially available ones can be used. Further, the second non-foaming layer 5 may contain a known additive in addition to the resin component, but it is preferably blended so that the content of the resin component is 70 to 100% by weight. The thickness of the second non-foamed layer 5 is preferably 10 to 50 μm, more preferably 10 to 20 μm.

(Pattern pattern layer 6)
The pattern pattern layer 6 is a layer for adding a pattern to the wallpaper original fabric 1. Examples of the pattern include a wood grain pattern, a stone grain pattern, a sand grain pattern, a tiled pattern, a brickwork pattern, a cloth grain pattern, a leather squeezing pattern, and a geometric figure. The pattern can be appropriately selected according to the type of the original fabric for wallpaper 1.
As a method of forming the pattern pattern layer 6, for example, it can be formed by printing a pattern pattern. When forming the pattern layer 6, the primer layer may be formed in advance if necessary. Examples of the printing method include gravure printing, flexographic printing, silk screen printing, and offset printing. As the printing ink, for example, a printing ink containing a colorant, a binder resin, and a solvent can be used. As these inks, known inks may be used.

The binder resin is, for example, acrylic resin, styrene resin, polyester resin, urethane resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, alkyd resin, petroleum resin. Resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, fibrous derivatives, rubber resins and the like can be used. Examples of the solvent (or dispersion medium) include petroleum-based organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, -2-methoxyethyl acetate, and acetate. -2-Ester organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol; acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc. Ketone-based organic solvent; ether-based organic solvent such as diethyl ether, dioxane, tetrahydrofuran; chlorine-based organic solvent such as dichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene; water and the like can be used.

(Discoloration prevention function layer 7)
The discoloration prevention function layer 7 is arranged on the outermost surface layer and is a layer for protecting the pattern pattern layer 6. As the resin component of the discoloration prevention functional layer 7 (hereinafter, also referred to as “matrix resin”), for example, a vinyl chloride resin or an olefin resin can be used. Further, the discoloration prevention functional layer 7 contains an additive in addition to the matrix resin. The additive contains an additive (discoloration inhibitor) containing at least one selected from the group consisting of zinc ion, pyrithione ion and salts thereof. The additive (discoloration inhibitor) is preferably 0.05 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the matrix resin. The thickness of the discoloration prevention functional layer 7 is preferably 0.3 μm or more and 20 μm or less, and more preferably 0.3 μm or more and 10 μm or less.

(Manufacturing method of foam wallpaper 9)
Next, a method of manufacturing the foam wallpaper 9 will be described.
In the method for producing the foamed wallpaper 9 of the present embodiment, the foaming agent-containing resin layer 4 is foamed by heating the above-mentioned original wallpaper 1 to produce the foamed wallpaper 9. The heating temperature is preferably 180 to 240 ° C, more preferably 210 to 230 ° C. The heating time is preferably 20 to 60 seconds, more preferably 25 to 40 seconds. The foaming ratio is 3 times or more, preferably 4 to 5 times. This is because if the foaming ratio is too low, it is difficult to give an excellent appearance design, and if the foaming ratio is too high, the foaming agent-containing resin layer 4 is mechanically weakened and the scratch resistance tends to be lowered.

Before the formation of the second non-foaming layer 5, the foaming agent-containing resin layer 4 after foaming may be resin-crosslinked by a chemical cross-linking method or irradiation. Thereby, the scratch resistance of the foam wallpaper 9 can be improved.
Further, at least the discoloration prevention function layer 7 (outermost layer) may be embossed. As a result, for example, as shown in FIG. 3, the embossing 10 is provided on the surface of the foam wallpaper 9, and in addition to the designability of the pattern layer 6, the designability of the embossing 10 can be felt.

(Effect of this embodiment)
(1) As described above, in the wallpaper raw fabric 1 of the present embodiment, the foaming agent-containing resin layer 4 containing a foaming agent, zinc ions, pyrithione ions, and these are arranged on the outermost layer on the base material 2. The discoloration prevention functional layer 7 containing an additive containing at least one selected from the group consisting of salts was laminated in this order. As a result, the zinc ions and the like contained in the additive are separated, so that the pH of the water-based adhesive adhering to the surface side of the foamed wallpaper can be biased to the acidic side. The mechanism by which the pH of the water-based adhesive is biased toward the acidic side is that, for example, zinc ions contained in the additive bind to the hydroxyl groups of the water-based adhesive adhering to the surface side of the foamed wallpaper, and the protons in the water-based adhesive increase. Can be considered. Therefore, the starch contained in the water-based adhesive can be decomposed, and the discoloration caused by the starch contained in the water-based adhesive can be suppressed.

Further, since the zinc ion is a divalent ion, it bonds with two hydroxyl groups. Therefore, the pH of the water-based adhesive can be sufficiently biased to the acidic side as compared with, for example, monovalent sodium ion or the like. Thereby, discoloration caused by starch can be appropriately suppressed.
Incidentally, for example, a monovalent ion such as a sodium ion cannot sufficiently bias the pH of an aqueous adhesive to an acidic side, unlike a divalent ion such as a zinc ion. Therefore, it becomes difficult to appropriately suppress discoloration caused by starch contained in the water-based adhesive.

(2) Further, the thickness of the discoloration prevention functional layer 7 is set to 0.3 μm or more and 20 μm or less. Therefore, the discoloration prevention effect can be obtained without affecting the pattern.
(3) Further, the discoloration prevention functional layer 7 is configured to contain 0.05 parts by mass or more and 20 parts by mass or less of the additive with respect to 100 parts by mass of the matrix resin. Therefore, it is easy to apply and the effect can be more exhibited.
(4) Further, the foaming agent-containing resin layer 4 is resin-crosslinked by a chemical cross-linking method or irradiation. Therefore, the scratch resistance of the foam wallpaper 9 can be improved.

(5) Further, the foaming agent-containing resin layer 4 has a non-foaming agent-containing resin layer on one side or both sides thereof. Therefore, the surface can be smoothed and the printability can be improved.
(6) Further, the matrix resin of the discoloration prevention functional layer 7 is made of a vinyl chloride resin and / or an olefin resin. Therefore, sheet molding suitable for the foam wallpaper 9 can be performed.

(7) Further, the foaming agent was configured to be at least one selected from the group consisting of an azo compound, ammonium carbonate, ammonium bicarbonate, and ammonium nitrite. Therefore, safety and controllability of foamability can be improved.
(8) Further, the base material 2 was made into a fibrous sheet. Therefore, it can be treated as a general-purpose wallpaper original fabric 1.

(9) Further, the foamed wallpaper 9 of the present embodiment is formed by foaming the foaming agent-containing resin layer 4 of the wallpaper raw fabric 1. Therefore, by diverging the protons contained in the additive, the pH of the water-based adhesive adhering to the surface side of the wallpaper can be biased to the acidic side, so that the starch contained in the water-based adhesive can be decomposed. Discoloration caused by starch contained in the water-based adhesive can be suppressed. (10) Further, the embossing 10 is formed at least on the discoloration prevention function layer 7 (outermost layer). Therefore, the foam wallpaper 9 having a high design property by the embossing 10 can be formed.

(11) Further, in the method for producing the foam wallpaper 9 of the present embodiment, the base material 2, the foaming agent-containing resin layer 4 containing a foaming agent, and zinc ions, pyrithione ions, and salts thereof arranged on the outermost layer are used. A foaming agent-containing resin layer of the wallpaper raw fabric 1 formed by laminating the discoloration prevention functional layer 7 containing an additive containing at least one selected from the above group. 4 was made to foam. As a result, the discoloration prevention functional layer 7 containing an additive having a proton as a counter cation can be formed on the outermost surface layer of the foamed wallpaper 9.

Examples of the present invention will be described.
(Example 1)
In Example 1, a known T-die extruder was used to form the first non-foaming layer 3, the foaming agent-containing resin layer 4, and the second non-foaming layer 5 in this order, with the thickness of each layer being 10 μm and 70 μm. A film was formed so as to have a thickness of 10 μm to obtain a laminated body consisting of three layers. Here, as the resin of the first non-foaming layer 3 and the second non-foaming layer 5, 100 parts by mass of low-density polyethylene (Japan Polyethylene Corporation, trade name: LJ802A) was used. The foaming agent-containing resin layer 4 is a foaming agent (manufactured by Eiwa Kasei Kogyo Co., Ltd., trade name ADCA # 3) with respect to 100 parts by mass of low-density polyethylene (Japan Polyethylene Co., Ltd., trade name: LJ802A). 8 parts by mass, calcium carbonate (manufactured by Bihoku Powder Co., Ltd., trade name: Softon 1000) 30 parts by mass, titanium dioxide (pigment) (manufactured by Ishihara Sangyo Co., Ltd., trade name: TIPAQUE CR-60-2) 20 mass A foaming aid (manufactured by ADEKA Co., Ltd., trade name: Adecaster OF-101) with 8 parts by mass was used.

Then, a laminated sheet is formed by laminating the first non-foaming layer 3 of the above-mentioned three-layer laminate on a backing paper (rice weighing 65 g / m ² , manufactured by Kohjin Co., Ltd., WK-655T). bottom. Further, the second non-foaming layer 5 of the laminated sheet was irradiated with an electron beam having an acceleration voltage of 200 kV and an irradiation dose of 55 KGy to carry out resin cross-linking on the foaming agent-containing resin layer 4. Next, by gravure printing, a texture pattern is printed on the second non-foaming layer 5 of the laminated sheet using a water-based ink (manufactured by Dainichiseika Kogyo Co., Ltd., trade name: Hydric) to form a pattern pattern layer. 6 was formed. Subsequently, on the pattern layer 6, an ink containing 10 parts by mass of an additive containing a salt of pyrithione ion (manufactured by Osaka Gas Chemical Co., Ltd., trade name: Slaoff 95) with respect to 100 parts by mass of the matrix resin. (Acrylic resin-based water-based ink) was applied by the gravure direct coater method. The amount of ink applied was adjusted so that the film thickness after drying was about 1 [μm]. Subsequently, the applied ink was dried and cured in a drying oven at 140 [° C.] to form the discoloration prevention functional layer 7. Subsequently, the foaming agent-containing resin layer 4 is foamed in a heating heating furnace at 230 [° C.] to form a foaming agent-containing resin layer, and then the foaming agent-containing resin layer is passed between a cooling roll and a pressure roll to be embossed. The foamed wallpaper 9 having the embossed 10 (concave and convex pattern) on the surface was formed by thermocompression bonding.

(Example 2)
In Example 2, the amount of the additive added to the discoloration prevention functional layer 7 was 0.5 parts by mass with respect to 100 parts by mass of the matrix resin. Other than that, the configuration was the same as that of Example 1.
(Example 3)
In Example 3, the amount of the additive added to the discoloration prevention functional layer 7 was 20 parts by mass with respect to 100 parts by mass of the matrix resin. Other than that, the configuration was the same as that of Example 1.

(Example 4)
In Example 4, the thickness of the discoloration prevention functional layer 7 was set to 0.3 μm. Other than that, the configuration was the same as that of Example 1.
(Comparative Example 1)
In Comparative Example 1, an additive having sodium ions (manufactured by Wako Pure Chemical Industries, Ltd., trade name: sodium stearate) was used as an additive for the discoloration prevention functional layer 7, and the amount of the additive added was determined. It was 1 part by mass with respect to 100 parts by mass of the matrix resin. Other than that, the configuration was the same as that of Example 1.

(Comparative Example 2)
In Comparative Example 2, an additive having a sulfonic acid ion (anion ion) (manufactured by Wako Pure Chemical Industries, Ltd., trade name: sodium linear alkylbenzene sulfonate) was used as the additive for the discoloration prevention functional layer 7. The amount of the additive added was 1 part by mass with respect to 100 parts by mass of the matrix resin. Other than that, the configuration was the same as that of the second embodiment.

(evaluation)
For Examples 1 to 4 and Comparative Examples 1 and 2, the discolored state of the foam wallpaper 9 was evaluated.
Specifically, a starch-based adhesive is thinly applied on the discoloration prevention functional layer 7 of the foam wallpaper 9, and then ultraviolet rays are irradiated for a predetermined time to visually observe the discolored state of the applied starch-based water-based adhesive. Evaluated in. Then, when there was no discoloration, it was determined as a pass "○", and when there was a discoloration, it was determined as a fail "x".
The evaluation results are shown in Table 1.

From Table 1, in Examples 1 to 4, there was no discoloration in the starch-based water-based adhesive applied on the discoloration prevention functional layer 7. On the other hand, in Comparative Examples 1 and 2, there was discoloration. As a result, it was confirmed that discoloration of the starch-based water-based adhesive can be suppressed by adding an additive containing a salt of pyrithione ion to the discoloration prevention function layer 7 (outermost layer).

1 ... Original fabric for wallpaper, 2 ... Base material, 3 ... First non-foaming layer, 4 ... Foaming agent-containing resin layer, 5 ... Second non-foaming layer, 6 ... Pattern layer, 7 ... Discoloration prevention function layer , 8 ... Intermediate layer, 9 ... Foam wallpaper, 10 ... Embossed

Claims (10)

A foaming agent-containing resin layer containing a foaming agent and a functional layer containing an additive containing at least one selected from the group consisting of zinc ions, pyrithione ions and salts thereof are laminated on a base material. Has been
The original fabric for wallpaper, wherein the foaming agent-containing resin layer is resin-crosslinked by a chemical cross-linking method or irradiation. The original fabric for wallpaper according to claim 1, wherein the thickness of the functional layer is 0.3 μm or more and 20 μm or less. The original fabric for wallpaper according to claim 1 or 2, wherein the functional layer contains 0.05 parts by mass or more and 20 parts by mass or less of the additive with respect to 100 parts by mass of the matrix resin. The original fabric for wallpaper according to any one of claims 1 to 3, wherein the foaming agent-containing resin layer has a non-foaming agent-containing resin layer on one side or both sides thereof. The original fabric for wallpaper according to any one of claims 1 to 4, wherein the matrix resin of the functional layer is a vinyl chloride resin and / or an olefin resin. The for wallpaper according to any one of claims 1 to 5, wherein the foaming agent is at least one selected from the group consisting of an azo compound, ammonium carbonate, ammonium bicarbonate, and ammonium nitrite. Original fabric. The original fabric for wallpaper according to any one of claims 1 to 6, wherein the base material is a fibrous sheet. A foamed wallpaper formed by foaming a foaming agent-containing resin layer of the original fabric for wallpaper according to any one of claims 1 to 7. The foam wallpaper according to claim 8, wherein at least the functional layer is embossed. A base material, a foaming agent-containing resin layer containing a foaming agent, and a functional layer containing at least one of zinc ions, pyrithion ions, and salts thereof are laminated to form a raw fabric for wallpaper, and the foaming agent is formed. A method for producing a foamed wallpaper, which comprises foaming a foaming agent-containing resin layer of a raw fabric for wallpaper formed by cross-linking the contained resin layer with a resin by a chemical cross-linking method or irradiation.

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