JPH11115111A - Formaldehyde scavenging wall paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide formaldehyde scavenging wall paper having a scavenging function of harmful formaldehyde. SOLUTION: This scavenging wall paper 20 comprises a laminate having a foam resin layer 3 and a decorating layer 5 provided on a base material sheet, a primer layer 4 and a surface protective layer 6 on the layer 5 laminated between the layer 3 and the layer 5 as needed in such a manner that formaldehyde scavenger is contained in at least one of the primer layer 4, the decorating layer 5 and the protective layer 6 of the laminate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wallpaper used for walls of houses, hotels, public facilities and the like.

[0002]

2. Description of the Related Art Conventionally, many decorative boards or materials such as ceiling materials, wall materials, floor materials, etc., and doors, sliding doors, etc., have been used for the interior of buildings. The decorative board or the decorative material is used by attaching a decorative sheet made of a paper-based substrate or the like to the surface of the substrate. These base materials are generally wood plywood, wood fiber board, wood base material such as particle board, gypsum board, gypsum base material such as gypsum slag board, pulp cement board, fiber cement board such as wood chip cement board,
GRC and concrete. For example, wood-based substrates are bonded by an adhesive, and an urea-based, melamine-based, or phenol-based resin adhesive is often used as the adhesive in terms of adhesive performance and cost. However, these adhesives contain free formaldehyde, and formaldehyde is released by decomposition of the resin. Therefore, when a decorative sheet is stuck to such a wood-based substrate as it is, formaldehyde is emitted into a room or the like. That is, formaldehyde is released into the air from these interior materials and construction materials, which impairs the sanitary environment such as a room.

[0003] In addition, some adhesives used for laminating wallpaper to a base material of a wall surface contain formaldehyde as a stabilizer for the adhesive and a preservative, and when these adhesives are used. However, there is also a problem that formaldehyde is released into the air, which also impairs the sanitary environment such as a room.

[0004] Therefore, many proposals have been made as a method for preventing the release of formaldehyde from these woody base materials. For example, measures have been taken such as using a formaldehyde-free resin such as a vinyl acetate resin or adding a formaldehyde trapping substance composed of an organic amino compound to a formaldehyde-generating resin such as a urea resin. However, since resin containing no formaldehyde has a low adhesive strength, there is a problem that the adhesive strength between layers is insufficient in the case of plywood, and physical properties such as strength are changed in the case of a particle board or a wood fiber board. There was a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a formaldehyde capturing wallpaper having a toxic formaldehyde capturing function. .

[0006]

Means for Solving the Problems In order to achieve the above object, a solution of the present invention is to provide a foamed resin layer and a decoration treatment layer on a base sheet, and a primer between the foamed resin layer and the decoration treatment layer if necessary. In a laminate in which a surface protective layer is laminated on a layer and a decoration treatment layer, a formaldehyde scavenger is contained in at least one of the primer layer, the decoration treatment layer, and the surface protection layer of the laminate. Formaldehyde capture wallpaper. With such a configuration, it is generated from an adhesive used for bonding a base material such as a base material used for a building interior such as a ceiling material or a floor material, or attaching a wallpaper to the base material. And
The formaldehyde released into the room is trapped and absorbed by the formaldehyde trapping agent contained in at least one of the primer layer, the decoration treatment layer, and the surface protection layer of the laminate, so that the formaldehyde released into the room is released. The amount of irritating odor due to formaldehyde is very low.

Further, the surface protection layer is formed of a synthetic resin-based aqueous emulsion solution. By doing so, it is easy to add and mix the formaldehyde scavenger, and since it is composed of an aqueous solution, there is no evaporation of the organic solvent, which is preferable from the viewpoint of fire prevention and work environment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 to FIG. 3 are cross-sectional views showing a laminated structure of an embodiment of the wallpaper of the present invention.
0 and 20 are wallpaper, 2 is backing paper, 3 is foam resin layer, 4 is primer layer, 5 is decoration treatment layer, 5a is solid ink layer, 5
b represents a picture ink layer, and 6 represents a surface protective layer.

As shown in FIG. 1, the wallpaper 1 of the present invention has a structure in which a foamed resin layer 3 and a decoration processing layer 5 composed of a solid ink layer 5a and a picture ink layer 5b are laminated on the upper surface of a backing paper 2. In this case, any one of the solid ink layer 5a or the pattern ink layer 5b that forms the decoration processing layer 5, or any of the solid ink layer 5a and the pattern ink layer 5b contains an ink containing a formaldehyde scavenger. Thus, the ability to capture and adsorb formaldehyde can be sufficiently exhibited without forming a separate formaldehyde capturing layer.

[0010] The backing paper 2 used in the present invention is mainly composed of cellulose fibers, and if necessary, synthetic fibers, inorganic fibers, synthetic pulp and the like are appropriately blended, and a self-extinguishing filler, other fillers,
Dry paper strength enhancer, wet Paper strength enhancer, coloring agent, sizing agent, fixing agent, etc. are appropriately added to obtain paper, and in particular, a thickness of 0.10 having a weighing of 70 to 120 g / m ^2.
Flame-retardant paper with a thickness of 0.12 mm for vinyl wallpaper is preferably used.

As the resin used for the foamable resin layer 3 of the present invention, polyvinyl chloride, a copolymer containing polyvinyl chloride as a main component and vinyl acetate, acrylic acid, ethylene-vinyl acetate copolymer or the like, A mixture of a copolymer of the above and polyvinyl chloride is appropriately mixed with a stabilizer, a plasticizer and a dispersant to form a paint, or dissolved in a solvent or the like to form a paint, or a vinyl acetate-based An inorganic filler and a metal hydrate are added to one or more resin mixtures of aqueous emulsions, urethane-based aqueous emulsions, acrylic-based aqueous emulsions, and polyolefin-based aqueous emulsions to form a paint in the form of a water-soluble emulsion. Things are available.

The foaming agent used in the foamable resin layer 3 is decomposed below the temperature at which the resin used in the foamable resin layer 3 is completely melted and gelled, and above the softening point of the resin. A pyrolytic type or a microcapsule type containing a gas or a low-boiling organic solvent is used. Examples of the pyrolytic blowing agent include azodicarboxylic acid amide, azobisisobutylnitrile, diazobenzene and the like. Azo compounds, nitroso compounds such as dinitrosopentamethylenetetramine, N, N-dimethyl-N, N-dinitrosoterephthalamide, and sulfonylhydrazide compounds such as paratoluenesulfonylhydrazide and 4,4-oxybisbenzenesulfonylhydrazide. Organic blowing agents, or inorganic blowing agents such as sodium bicarbonate and ammonium carbonate. Is, examples of the microcapsule type foaming agent, polyacrylonitrile, vinylidene chloride -
Organic foaming agents such as acrylonitrile copolymers, phenolic resins, and epoxy resins can be used.

In the case of a thermal decomposition type foaming agent, the decomposition temperature is adjusted in combination with a decomposition aid such as oxalic acid, citric acid, tartaric acid, urea, a zinc compound, and a copper compound to process the foamable resin. It is desirable to decompose below the temperature to generate a gas, and a coloring agent such as titanium oxide, carbon black and cyanine blue, a filler such as calcium carbonate and clay, and a flame retardant such as antimony trioxide and molybdenum oxide. Can be appropriately blended.

The decoration processing layer 5 applied to the foamed resin layer 3 includes:
A solid ink layer 5a for solid printing on the entire surface and a pattern ink layer 5b for expressing, for example, wood grain, stone grain, surface pattern of natural leather, cloth grain, abstract pattern, etc., are attached, and known ink vehicles can be used. For example, acrylic or vinyl chloride, vinyl chloride-vinyl acetate copolymer, chlorinated polyolefin, nitrocellulose, if necessary for a simple substance or a mixture of plural resin resins such as urethane, formaldehyde scavenger, pigment , A colorant such as a dye, an extender pigment, a solvent and the like can be appropriately mixed. Also,
Although not shown, in order to impart design properties, a part of the pattern ink layer 5b is formed using a composition containing a compound that prevents decomposition of the foaming agent or prevents the action of the foaming accelerator, that is, a foaming suppression ink. A foam suppression pattern may be formed on the foamable resin layer, and the foam may be heated and foamed to form a foam in which the foam suppression pattern portion is recessed, so that foam suppression embossing by a chemical reaction may be performed.

A typical substance having a formaldehyde-scavenging action is an organic amino compound, which reacts easily with formaldehyde, and its product does not dissociate formaldehyde, and is a harmless and stable substance. Urea, ethylene urea, propylene urea, 5-hydroxypropylene urea, 5-methoxypropylene urea, 5-methylpropylene urea, parabanic acid (glyoxal monourein), 4,5-dimethoxyethylene urea, pyrrolidine, piperidine, morpholine, dicyandiamide , 2-
Examples include amines such as hydrazobenzothiazole or derivatives thereof, amides, and imides. Also,
If necessary, ammonium hydroxide may be added. Further, the formaldehyde-trapping substance may be supported on an inorganic powder such as silica, talc, clay, activated carbon, zeolite, and sepiolite.

FIG. 2 shows a laminated structure of a wallpaper 10 according to a second embodiment of the wallpaper of the present invention. The wallpaper 10 of the present invention shown in FIG. A primer layer 4 interposed therebetween, wherein the primer layer 4 is formed of a paint containing a formaldehyde scavenger, and is used as a base material for building materials such as ceiling materials or floor materials. Generated from the adhesive used for the bonding of substrates, etc., or the application of wallpaper to the substrate,
Formaldehyde released into the room is captured and adsorbed, thereby reducing the amount of formaldehyde released into the room. In addition, the primer layer 4 is provided to improve the printability of the foamed resin layer 3 surface, improve the expression of the decoration treatment layer 5 provided on the foamed resin layer 3 surface, and enhance the design. When a foamable resin composition obtained by adding a microcapsule-type foaming agent to an aqueous emulsion resin solution is used, the surface is poor in smoothness, and it is difficult to provide a dark and fine pattern layer. Thereby, the surface of the foamable resin layer 3 can be formed smoothly, the transferability of the printing ink can be improved, and a high-density, fine pattern layer can be provided. It is intended to prevent the deterioration of the design property due to a decrease in the ink density or the like.

The resin used for the primer layer 4 is the same as that used for forming the decoration treatment layer 5,
For example, acryl-based, vinyl chloride-based, vinyl chloride-vinyl acetate copolymer, chlorinated polyolefin, a single or a mixture of resin-based resins such as urethane-based can be used,
The coating amount of the primer layer 4 is not particularly limited, but a thickness of about 1.5 to 4.0 g / m ² is desirable.

A wallpaper 20 according to a third embodiment of the wallpaper of the present invention.
3 is shown in FIG. In the wallpaper 20 of the present embodiment, the foamed resin layer 3, the primer layer 4, and the decoration treatment layer 5 composed of the solid ink layer 5a and the pattern ink layer 5b are laminated on the upper surface of the backing paper 2, and the surface protection layer 6 is laminated thereon. The surface protective layer 6 is formed of a paint containing a formaldehyde scavenger. By forming the surface protection layer 6 of transparent ink over the entire upper surface of the decoration processing layer 5 as described above, the wallpaper 20 can also improve the surface properties such as the abrasion property and the stain prevention property of the wallpaper surface. It is. When the coating liquid for forming the surface protective layer 6 is a synthetic resin-based aqueous emulsion paint, the addition of a formaldehyde scavenger can be easily performed,
It is possible to further enhance the formaldehyde trapping performance of the surface protective layer 6.

On the decoration processing layer 5, that is, on the outermost surface of the wallpaper, a surface protective layer 6 made of a transparent resin is formed for the purpose of imparting physical properties such as abrasion, abrasion and contamination to the wallpaper. The surface protective layer 6 made of the transparent resin is preferably a resin having a higher softening point than the resin constituting the foamed resin layer 3. Examples of the resin used for the surface protective layer 6 include isocyanate and amine. Or a synthetic resin, such as polyurethane, polyester, or epoxy resin, cross-linked with an organic solvent, or a mixture of acrylic, polyolefin, vinyl chloride, vinylidene chloride, vinyl acetate, and ethylene-vinyl acetate. At least one or two or more resin mixtures of aqueous synthetic resin emulsions such as polymers, silicones, polyurethanes and polybutenes; You can use.

Further, from the viewpoint of adding and mixing the formaldehyde scavenger to the resin solution, the resin solution is preferably composed of an aqueous emulsion solution of a synthetic resin. The application amount of the aqueous emulsion resin layer is not particularly limited, but is preferably about 7.0 to 16.0 g / m ² . If it exceeds 16.0 / m ² , drying after coating becomes difficult, and if it is less than 7.0 g / m ² , a sufficient thickness cannot be obtained, and physical properties such as abrasion and contamination are inferior.

In the above-described embodiment, only the case where a formaldehyde scavenger is added to each of the primer layer 4, the decoration treatment layer 5, and the surface protection layer 6 of the laminate to form a formaldehyde scavenging layer has been described. However, although not described in the present invention, a formaldehyde scavenger may be added to a plurality of layers of the primer layer 4, the decoration treatment layer 5, and the surface protection layer 6, and although not shown, Formaldehyde trapping layers are formed on the front and back surfaces of the backing paper 2 and the surface of the surface protective layer 6 to trap and adsorb the formalin released from the material to which the wallpaper is adhered, and to improve the ability of trapping and adsorbing formalin from the surface. The configuration may be enhanced.

[0022]

【Example】

Example 1 Flame-retardant backing paper weighing 70 g / m ² (manufactured by Tokushu Paper Co., Ltd.)
TT-70) was coated with a vinyl chloride paste containing a blowing agent azodicarboxylic acid amide to a thickness of 200 μm on the flame-retardant backing paper using a comma coater.
Heat treatment for 5 minutes to gel, form a primer layer on it with vinyl chloride ink, and color solid ink layer and pattern ink layer by gravure printing using vinyl chloride ink containing formaldehyde scavenger And print
Further, a wallpaper was produced by heating at 220 ° C. for 40 seconds and foaming.

Example 2 Flame-retardant backing paper having a basis weight of 70 g / m ² (manufactured by Tokushu Paper Co., Ltd.)
TT-70) is coated with a vinyl acetate-based aqueous emulsion paint containing a capsule foaming agent on the flame-retardant backing paper at 130 g / m ² (when dry) using a comma coater, and dried at 120 ° C. for 60 seconds. A primer layer is formed on the surface using an acrylic ink, and a colored solid ink layer and a pattern ink layer are printed using an acrylic ink containing a formaldehyde scavenger, followed by heating at 170 ° C. for 40 seconds to foam. By doing so, a wallpaper was produced.

Example 3 Flame-retardant backing paper weighing 70 g / m ² (manufactured by Tokushu Paper Co., Ltd.
TT-70) was coated with a vinyl acetate resin-based aqueous emulsion paint containing a capsule foaming agent on the flame-retardant backing paper with a comma coater at 130 g / m ² (when dry) to obtain a coating of 120 g / m ^2.
At 60 ° C. for 60 seconds, a primer layer is formed thereon using an acrylic ink, and a colored solid ink layer and a pattern ink layer are further printed using an acrylic ink. Paint for surface protection contained (Vinibrand S-888, manufactured by Nissin Chemical Co., Ltd.)
To 2.0 g / m ² (when dry) and then 1
A wallpaper was prepared by heating at 70 ° C. for 40 seconds and foaming.

Comparative Example 1 A wallpaper was produced in the same manner as in Example 1 except that the colored solid ink layer and the pattern ink layer were printed by gravure printing using an acrylic ink.

Comparative Example 2 A wallpaper was prepared in the same manner as in Example 2 except that the colored solid ink layer and the pattern ink layer were printed by gravure printing using an acrylic ink.

The above Examples 1, 2, 3 and Comparative Example 1,
2. Cut each wallpaper into a size of 10 × 15 cm, cover the entire back of the cut wallpaper (flame-retardant backing paper side) with aluminum foil, put it in a desiccator having a diameter of 24 cm, and place it in the bottom center of the desiccator. 29 μl of a formaldehyde solution (special grade formaldehyde solution, manufactured by Nacalai Tesque, Inc.) diluted 80-fold with distilled water was dropped on a Petri dish, left at 20 ° C. for 24 hours, and then measured for the formaldehyde concentration in the desiccator. , The formaldehyde concentration was 0.919 ppm for the wallpaper of Comparative Example 1 and Comparative Example 2
0.421 ppm for the wallpaper of Example 1 and 0.460 pp for the wallpaper of Example 2 with respect to 1.144 ppm for the wallpaper of
m, 0.106 ppm for the wallpaper of Example 3.

[0028]

As described above, the wallpaper of the present invention emits formaldehyde generated from the base material of the wall surface or the adhesive used for sticking the wallpaper to the base material, and from the ceiling material, floor material and the like. Formaldehyde can also be effectively captured.

Further, by forming the surface protective layer with an aqueous emulsion solution, a formaldehyde scavenger can be easily mixed, and a large amount of the formaldehyde scavenger can be adhered to the wallpaper surface. There is no evaporation of the solvent and it is suitable for fire prevention and work environment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a laminated configuration of a first embodiment of a wallpaper of the present invention.

FIG. 2 is a cross-sectional view illustrating a laminated configuration of a second embodiment of the wallpaper of the present invention.

FIG. 3 is a cross-sectional view illustrating a laminated configuration of a third embodiment of the wallpaper of the present invention.

[Explanation of symbols]

 1, 10, 20 wallpaper 2 backing paper 3 foam resin layer 4 primer layer 5 decoration treatment layer 5a solid ink layer 5b picture ink layer 6 surface protection layer

Claims (2)

[Claims] 1. A laminate in which a foamed resin layer and a decoration treatment layer are provided on a base sheet, and a primer layer and a surface protection layer are laminated on the decoration treatment layer between the foamed resin layer and the decoration treatment layer as required. A formaldehyde-trapping wallpaper, wherein at least one of the primer layer, the decoration treatment layer, and the surface protective layer of the laminate contains a formaldehyde-trapping agent. 2. The formaldehyde-trapping wallpaper according to claim 1, wherein the surface protective layer is formed of a synthetic resin-based aqueous emulsion solution.