JP2006299455A - Aldehyde-adsorbing wallpaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide aldehyde-adsorbing wallpaper efficiently adsorbing aldehydes vaporized or remaining in the air, having excellent design with beautiful foaming and without conspicuous yellowing caused by aldehyde adsorption. <P>SOLUTION: The aldehyde-adsorbing wallpaper has an aldehyde-adsorbing layer 2 and a decoration layer 3 in this order on the surface of lining paper 1. The exposed area of the aldehyde-adsorbing layer from the decoration layer is 10-70%. The aldehyde-adsorbing layer contains porous inorganic particles at the rate of 10-80 wt.% based on the whole weight of the adsorbing layer. The porous inorganic particles having 0.8-20μm average particle size and/or ≥8 aspect ratio are preferably used. A thermoplastic resin layer may be installed on the back of the lining paper. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a wallpaper capable of efficiently adsorbing aldehydes that are volatilized or staying in the air, forming a decorative layer having excellent design properties, in which yellowing due to adsorption of aldehydes is not noticeable The present invention relates to an aldehyde adsorption wallpaper.

  In recent years, “sick house syndrome” due to volatile organic compounds (Volatile Organic Compound: hereinafter sometimes referred to as “VOC”) generated from building materials has become a social problem. Guideline values are shown. Under such circumstances, various wallpapers that have been provided with the ability to capture and adsorb aldehydes represented by formaldehyde, which are said to have particularly great influence on sick house syndrome, have been commercialized and used.

As a configuration of the wallpaper, a resin wallpaper in which a decorative layer made of a synthetic resin is provided on a backing paper in order to give a three-dimensional design such as an uneven pattern on the surface is generally used.
As a method of adsorbing aldehydes that are VOCs in such resin wallpaper,
(1) An aldehyde adsorption layer (an aldehyde adsorbent is impregnated or applied on the back of the backing paper in order to suppress the release of aldehydes from the construction surface (boards, adhesives, heat insulation, etc.) And the above decorative layer is provided on the surface side of the backing paper (Japanese Patent Laid-Open Nos. 10-296918 and 10-329274).
(2) In order to efficiently adsorb aldehyde in the air, an aldehyde adsorption layer is provided on the outermost surface (uppermost layer) of the wallpaper that is in direct contact with air (Japanese Patent Laid-Open No. 11-48413).
(3) An aldehyde adsorbent is mixed in the decorative layer (Japanese Patent Laid-Open No. 10-1003004) and the like have been proposed.

However, (1) naturally has the problem that the aldehyde adsorbing layer is the lowest layer of the wallpaper, so it cannot adsorb aldehydes in the air, and (2) is mainly used as an aldehyde adsorbent. Since the “organic compound having an amine group” that is used generally has the property of coloring yellow by reacting with aldehydes, there is a problem of maintaining high whiteness associated with the use of wallpaper. (3) can be obtained by directly adding the above adsorbent (an organic compound having an amine group) to a foamable polyvinyl chloride resin (hereinafter also referred to as “PVC”), which is a typical wallpaper decoration layer. There is a problem in that, for example, the foamed cells are not uniform and the foamed cells are not uniform, which affects the appearance of the finished wallpaper, and a decorative layer having excellent design properties cannot be obtained.
JP-A-10-296918 JP-A-10-329274 Japanese Patent Laid-Open No. 11-048413 Japanese Patent Application Laid-Open No. 10-1003004

  In consideration of the above points, the present invention is a wallpaper capable of efficiently adsorbing aldehydes that are volatilized and staying in the air, and yellowing due to adsorption of aldehydes is not noticeable and foaming is good. An object of the present invention is to provide an aldehyde-adsorbing wallpaper having excellent design properties.

In order to solve the above problems, the present inventors have conducted various studies,
First, an aldehyde adsorbing layer containing an aldehyde adsorbing agent is provided on the surface of the backing paper instead of the uppermost layer of the wallpaper, and this adsorbing layer is partially exposed from the decorative layer provided on the aldehyde adsorbing layer. We focused on a new method of capturing and adsorbing aldehydes in the air.

Next, as a result of further examination under this focus,
By blending porous inorganic particles in a specific ratio in the aldehyde adsorbing layer, the aldehyde adsorbent is bonded to the inorganic particles, and a suitable aldehyde adsorbing function can be obtained. By blending inorganic particles of 0.8 to 20 μm, it is possible to effectively prevent the adsorbent from penetrating into the backing paper, so that a high aldehyde adsorption capacity can be obtained regardless of the amount of the adsorbent used. .
Furthermore, by using inorganic particles having an aspect ratio of 8 or more, the open time (the time during which the glue applied to the back of the wallpaper does not dry and can be applied) is longer despite the provision of the exposed portion. As a result, the present invention has been completed.

That is, the present invention has an aldehyde adsorbing layer and a decorative layer in this order on the surface of the backing paper, the exposed area of the aldehyde adsorbing layer from the decorative layer is 10 to 70%, The gist is an aldehyde-adsorbing wallpaper characterized in that the adsorption layer contains porous inorganic particles in a proportion of 10 to 80% by weight of the total weight of the adsorption layer.
In this case, the inorganic particles preferably have an average particle diameter of 0.8 to 20 μm, and those having an inorganic particle aspect ratio of 8 or more are preferably used. Further, a thermoplastic resin is used on the back surface of the backing paper. A layer may be provided.

As the backing paper of the present invention, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), groundwood pulp (GP), thermomechanical pulp (TMP), and the like that have been conventionally used as materials for wallpaper backing paper. And a mixture of at least one selected from paper pulp, waste paper pulp, and the like as appropriate.
These pulps can be mixed with synthetic fibers such as acrylic fibers and polyester fibers and inorganic fibers such as glass fibers in order to improve dimensional stability.

A backing paper made of such a material can be obtained by a paper making method similar to that of a conventional backing paper for wallpaper using a long paper machine or the like. For example, a basis weight of 75 to 150 g / m ² (thickness 90 A backing paper for wallpaper of about 200 μm) is preferably used.

In the present invention, the surface of the backing paper as described above has an aldehyde adsorbing layer and a decorative layer in this order, and the exposed area of the aldehyde adsorbing layer from the decorative layer is an aldehyde adsorbing performance surface. From the viewpoint of wallpaper design and the like, it is important that the content is 10 to 70%.
The conditions for controlling the aldehyde adsorption performance include the exposed area of the aldehyde adsorption layer, the type and amount of aldehyde adsorbent, and the coating amount of the aldehyde adsorption layer. If the exposed area is less than 10%, it will be difficult to sufficiently adsorb aldehydes in the air, and if it exceeds 70%, the finished decorative layer will lack the touch and luxury, and aldehydes will be adsorbed. Since the yellowing of the adsorbent due to the amount is conspicuous, in the present invention, the above-mentioned exposed area is used, and the more preferable exposed area is 20 to 50%. The decorative layer can be formed. Further, the type and blending amount of the aldehyde adsorbent and the coating amount of the aldehyde adsorbing layer may be appropriately determined according to the exposed area of the aldehyde adsorbing layer so as to sufficiently exhibit the aldehyde adsorbing performance. .

The aldehyde adsorbing layer is coated on the surface of the backing paper with a mixture of aldehydes adsorbing substance (hereinafter also referred to simply as “aldehyde adsorbing agent”) and other additives. Is provided.
This aldehyde adsorption layer is considered to be able to exhibit aldehyde adsorption performance as long as it contains an aldehyde adsorption agent, but the adsorption performance increases as the aldehyde adsorption agent present on the backing paper surface increases. Become.

Therefore, in the present invention, in order to prevent the aldehyde adsorbent from penetrating into the backing paper and retain more adsorbent on the surface of the backing paper, the aldehyde adsorbing layer is made of a porous material together with the aldehyde adsorbing agent. It is assumed that inorganic particles are used in combination.
The porous inorganic particles are physically bonded to the aldehyde adsorbent to prevent the aldehyde adsorbent from penetrating into the backing paper, and can hold the aldehyde adsorbent on the backing paper surface. . As a result, high aldehyde adsorption ability can be ensured despite the use of a small amount of the adsorbent.
The aldehyde adsorption layer by the combined use of the aldehyde adsorbent and the porous inorganic particles in the present invention can have an extremely high aldehyde adsorption ability.

In the present invention, it is important to contain porous inorganic particles in a proportion of 10 to 80% by weight, preferably 30 to 60% by weight, based on the total weight of the aldehyde adsorption layer.
If the content of the inorganic particles is less than 10% by weight, the aldehyde adsorbent cannot be sufficiently bonded to the porous inorganic particles, and the amount penetrating the backing paper increases. Not only is the effect saturated, but it becomes difficult to perform uniform mixing with the aldehyde adsorbent and other additives in the coating liquid, and the aldehyde adsorbing layer tends to be lost, and a decorative layer provided on the layer. This is not preferable because it also causes a problem with the adhesiveness.

Furthermore, in this invention, it is preferable to use a thing with an average particle diameter of 0.8-20 micrometers as a porous inorganic particle, More preferably, a 1-10 micrometers thing is used.
Inorganic particles having such an average particle size further prevent penetration of the aldehyde adsorbent into the backing paper by adding inorganic particles, and adsorb high aldehydes despite the use of a small amount of aldehyde adsorbent. The object of the present invention to obtain performance can be effectively achieved.
If the average particle diameter of the porous inorganic particles is less than 0.8 μm, there is a possibility that even if bonded to the aldehyde adsorbent, it passes through the fibers of the backing paper and hardly remains on the surface of the backing paper. If it exceeds 20 μm, the surface of the aldehyde adsorbing layer becomes rough, and particularly when the thickness of the aldehyde adsorbing layer is reduced to about 20 μm or less, the smoothness of the surface of the aldehyde adsorbing layer is remarkably lowered. There is a risk of inconvenience in formation.

Furthermore, in the present invention, it is suitable to use porous inorganic particles having an aspect ratio of 8 or more.
The aldehyde adsorbing wallpaper of the present invention has a form in which the surface of the backing paper is partially exposed, unlike a wallpaper or the like in which the entire surface of the backing paper is covered with a decorative layer. As a result, the moisture permeability and breathability of the backing paper becomes relatively high, and the glue applied to the back surface of the wallpaper at the time of wallpaper construction tends to dry, and there is a possibility that a long open time cannot be secured. Therefore, it is preferable to use flat or scale-like inorganic particles that are effective in improving water vapor and air barrier properties as the porous inorganic particles contained in the aldehyde adsorption layer. The flat or scale-like inorganic particles preferably have an aspect ratio of 8 or more. By using such inorganic particles, a long open time can be secured. When the aspect ratio is less than 8, the effect of improving air barrier properties is low, and a satisfactory open time may not be obtained.

  Specific examples of the porous inorganic particles include kaolin, calcined kaolin, talc, clay, satin white, zinc oxide, aluminum hydroxide, calcium carbonate, titanium oxide, zeolite, sepiolite, and silica. These can be used alone or in admixture of two or more by an appropriate combination. The average particle diameter and aspect ratio of the porous inorganic particles can also be adjusted by dispersing the particles with a filler such as a natural mineral using a high shearing disperser such as a homomixer. is there.

Any substance capable of adsorbing to aldehydes (aldehyde adsorbent) can be used as long as it has a function of physically and chemically reacting with aldehydes to change them into harmless and odorless states. However, among these, an organic compound having an amine group is preferable from the viewpoints of easy availability and handling.
Examples of the organic compound having an amine group include urea, ethylene urea, propylene urea, 5-hydroxypropylene urea, 5-methoxypropylene urea, 5-methylpropylene urea, paravanic acid (glyoxal monoureine), 4,5. -Amines such as dimethoxypropylene urea, hydrazine, pyrrolidine, piperidine, morpholine, dicyandiamide, 2-hydrazobenzothiazole, or derivatives thereof, amides, imides, etc., among which urea-based and hydrazine-based Organic compounds are preferred in terms of aldehyde adsorption performance.

Porous inorganic particles and aldehyde adsorbents include casein, starch, acrylic resin, vinyl chloride resin, vinyl acetate resin, ethylene-vinyl acetate copolymer resin, styrene-butadiene rubber (SBR), polyvinyl alcohol (PVA) ), A binder component made of a synthetic resin such as ethylene vinyl alcohol (EVOH) or melamine resin.
The binder component can be preferably used in a state of, for example, an emulsion type dispersed in a solvent such as water or an organic solvent, and the resin solid content may be appropriately selected depending on coating conditions and the like.

  The ratio of the binder component, the porous inorganic particles, and the aldehyde adsorbent in such an aldehyde adsorbing layer is appropriately changed within a range in which the objective aldehyde adsorbing function of the present invention can be suitably expressed. The porous inorganic particles are 10 to 80% by weight, preferably 30 to 60% by weight, and the aldehydes adsorbent is 10 to 50% by weight based on the total weight of the aldehydes adsorbing layer coated on the backing paper. %, Preferably 25 to 45% by weight, and the resin solid content is 10 to 80% by weight, preferably 15 to 45% by weight.

If the binder component is too small, the adhesive strength to aldehyde adsorbents and inorganic particles will be reduced, especially during use as wallpaper, the inorganic particles and aldehyde adsorbents physically bonded to the particles will be peeled off, if too much The ratio of inorganic particles and aldehyde adsorbent becomes relatively small, and the aldehyde adsorbing ability is lowered.
If there is too little aldehyde adsorbent, the effect of adsorbing aldehydes in the air will not be sufficiently obtained, and if too much, not only will the adsorption effect of aldehydes be saturated, but also adsorption of aldehydes that will not bind to inorganic particles Since the amount of the agent increases and a situation occurs that it penetrates into the backing paper, it is not efficient.

  In addition, the aldehyde adsorbing layer includes a binder, porous inorganic particles, aldehyde adsorbing agent, colorant, dispersant, antifoam as long as the effects of the present invention are not impaired. You may use additives, such as an agent and a pH adjuster.

The aldehyde adsorption layer composed of the binder component, porous inorganic particles, aldehyde adsorbent, and other additives described above is blended into a paint, and this paint is applied to the backing paper by appropriate means. Provided.
The method for forming the paint is not limited at all, but in the present invention, inorganic particles physically bonded to the adsorbent are used for the aldehyde adsorption layer in order to develop the aldehyde adsorption performance satisfactorily. It is important that it is uniformly dispersed therein.
For this purpose, for example, only the aldehyde adsorbent and inorganic particles are mixed in advance with an apparatus such as a blender, a Henschel mixer, a disper, a dissolver, etc., and both are sufficiently bonded together with other additives. In addition to an emulsion containing a predetermined amount of a binder component, a method of mixing with an apparatus similar to the above may be used. Alternatively, an emulsion containing a predetermined amount of a binder component may adsorb a predetermined amount of inorganic particles and aldehydes. It may be a method in which an agent and other additives are added simultaneously and mixed at once with the apparatus as described above.

The coating amount of such an aldehyde adsorption layer is preferably about 3 to 15 g / m ^{2 in} a dry state.
When the coating amount is less than 3 g / m ² , not only coating unevenness occurs, but also sufficient adsorption performance cannot be obtained, and when it exceeds 15 g / m ² , the coating layer becomes thick and is wound up as wallpaper. Inconvenience occurs when performing the above.

Moreover, as a coating method for providing an aldehyde adsorbing layer on the backing paper, for example, a general coating method such as a knife coater, a roll coater, an air knife coater, etc. can be adopted, and among them, the coating amount can be easily adjusted. For reasons such as these, the air knife method is preferred.
The coating on the backing paper may be any of an on-machine coating method incorporated in the paper making apparatus for the backing paper and an off-machine coating method using various coaters after the paper making process of the backing paper.

In the wallpaper of the present invention, a decorative layer is formed on the aldehyde adsorbing layer formed on the surface of the backing paper so that the adsorbing layer is partially exposed.
This decorative layer is the same as the decorative layer in ordinary resin wallpaper, and is a decorative layer made of vinyl chloride resin, olefin resin, acrylic resin, urethane resin, etc. A plastic material, a stabilizer, a colorant, a filler, a flame retardant, an antifungal agent, a foaming agent, a thermally expandable microcapsule and the like are formed as a raw material using a resin material added in an appropriate amount as necessary.

In addition, the decoration layer may be a single layer or a plurality of layers. In the case of a plurality of layers, each layer does not need to be completely overlapped, and finally the aldehyde viewed from the outermost surface of the wallpaper. The exposed area of the adsorbent layer may be 10 to 70%.
These layers may be a non-foamed layer, a foamed layer, or a combination of a non-foamed layer and a foamed layer, and are provided with an uneven design by chemical embossing or mechanical embossing. May be.

  When the foam layer is used, the foaming agent depends on the type of synthetic resin used. For example, when a vinyl chloride resin is used, an azo compound such as ADCA (azodicarbonamide), OBSH (4, 4 Low-boiling hydrocarbons in shells made of thermally decomposable foaming agents such as hydrazine derivatives such as' -oxybis (benzsulfonylhydrazide)) and thermoplastic polymer materials such as polyacrylonitrile, phenolic resins, and epoxy resins Thermally expandable microcapsules encapsulating In addition, when using only a foaming agent, it is good also as a decoration layer which provided the uneven | corrugated design by chemical embossing using a foaming inhibitor partially together with a foaming agent.

  In addition, like a normal resin wallpaper, the surface of the decoration layer may be printed with a printing ink, or if necessary, the surface may be matted, polished, imparted with antifouling, Various surface cosmetics can be applied to increase the surface strength.

The thickness of such a decoration layer is set to the same level as that of a normal resin wallpaper, and may be, for example, about 0.1 to 2.0 mm in a dry state.
If the thickness is less than 0.1 mm, it is difficult to form a beautiful decorative layer. If the thickness is more than 2.0 mm, it is difficult to handle as a wallpaper.

  The formation of the decoration layer is not limited at all in the formation (coating) method as long as the exposed area of the aldehyde adsorption layer from the decoration layer falls within the above range. For example, a knife coater, a comma coater, Consider decorative design so that the adsorption layer is partially exposed on the aldehyde adsorption layer on the surface of the backing paper by means of a roll coater, reverse roll coater, gravure printer, rotary screen printer, etc. You just apply.

As described above, the wallpaper of the present invention is provided with an aldehyde adsorbing layer containing porous inorganic particles in the above proportion on the surface of the backing paper, and the adsorbing layer is partially exposed on the adsorbing layer. However, the adsorbent hardly permeates the backing paper, despite the small amount of aldehyde adsorbent used, and can effectively adsorb aldehydes in the air.
Also, the adsorbent that turns yellow even if it adsorbs aldehydes in the air is partially covered by the decoration layer, and the decoration layer does not contain the aldehyde adsorbent, so yellowing is not noticeable and the decoration The initial color in the layer can be maintained well.
Therefore, since the aldehyde adsorbent is not contained in the decorative layer, which is the outermost layer of the wallpaper, there is no harmful effect related to foaming of the decorative layer, and a beautiful decorative layer can be formed.
Furthermore, since the wallpaper of the present invention has a decorative layer only partially formed and the backing paper thinly covered with the aldehyde adsorbing layer is partially exposed, it has higher air permeability and moisture permeability. Has performance. Therefore, when the wallpaper of the present invention is applied to a base material (such as gypsum board) that has the ability to adsorb aldehydes, the adsorption performance of the base material itself can be utilized, and the adsorption performance in the aldehyde adsorption layer. Synergistic effects can be obtained.

Moreover, in the wallpaper of this invention, you may provide the layer which consists of thermoplastic resins in the back surface of said backing paper.
In the present invention, an aldehyde adsorbing layer is provided on the surface of the backing paper. Since the aldehyde adsorbing layer contains inorganic particles, a surface active component such as a dispersant may be used in preparing the paint. However, when a coating containing a surface active component is applied to the backing paper, the size of the backing paper tends to be remarkably reduced. As a result, when the wallpaper is applied to the wall surface, it is applied to the back surface of the wallpaper. Since the moisture of the construction glue easily penetrates into the backing paper, the construction glue is easy to dry, and there is a possibility that sufficient open time cannot be secured. In order to avoid this, by providing a thermoplastic resin layer on the back surface of the backing paper, it is possible to improve the barrier property against moisture on the back surface of the backing paper and to ensure a sufficient open time.
In addition, as a method for adjusting the open time, in addition to providing the resin layer on the back surface as described above, it is possible to adopt a method such as making the construction paste less dry.

  As this thermoplastic resin, acrylic resin, vinyl chloride resin, vinyl acetate resin, ethylene-vinyl acetate copolymer resin, styrene-butadiene rubber (SBR), polyvinyl alcohol (PVA), ethylene vinyl alcohol (EVOH), melamine resin , Polyamide resins, polyester resins, and the like. These thermoplastic resins can be used alone or in admixture of two or more by an appropriate combination.

Such a thermoplastic resin may be made into a paint with a solvent, a plasticizer or the like, and a sizing agent, a stabilizer, a colorant, a filler, a flame retardant, an antifungal agent, and the like may be appropriately added as necessary. .
The paint may be either an emulsion type or a solvent type.

The coating amount of such a thermoplastic resin layer is preferably about 0.5 to 4.0 g / m ² in a dry state.
If the coating amount is less than 0.5 g / m ² , it is insufficient to adjust the open time, and if it exceeds 4.0 g / m ² , the coating amount is excessive to adjust the open time. As a result, the overall weight of the wallpaper increases and the handling of the wallpaper itself decreases.

  The method of forming the thermoplastic resin layer on the back side of the backing paper can be performed by coating the raw materials as described above with a known coater such as a doctor knife coater, a comma doctor coater, a roll coater, a reverse roll coater, or an air knife coater. Can be mentioned.

  As described above, the wallpaper of the present invention is provided with a layer made of a thermoplastic resin on the back side of the backing paper, so that even when the sizing degree of the backing paper is remarkably reduced due to the addition of a surface active component to the aldehyde adsorption layer. In addition, it is possible to prevent the adhesive glue from permeating into the backing paper, and it is possible to obtain an aldehyde adsorbing wallpaper having a sufficient open time at the time of construction.

The aldehyde adsorption wall paper of the present invention is
(1) Despite the small amount of adsorbent, high adsorption performance can be secured,
(2) Yellowing of the aldehyde adsorption layer due to adsorption of aldehydes is not noticeable,
(3) A beautiful decorative layer can be formed without hindering foaming,
(4) A synergistic effect with the adsorption performance of a base material (such as gypsum board) having adsorption performance of aldehydes can be obtained.
It is suitable as a wallpaper that reduces the VOC such as formaldehyde.

  Moreover, the aldehyde adsorbing wallpaper of the present invention uses an inorganic particle having an aspect ratio of 8 or more as inorganic particles used in the aldehyde adsorbing layer, so that the surface of the wallpaper is only partially covered by the decorative layer. In addition, it is possible to effectively prevent the moisture of the construction glue from drying at the time of wallpaper construction, and it is possible to obtain an aldehyde-adsorbing wallpaper having sufficient open time at the time of construction.

  Furthermore, by providing a layer made of a thermoplastic resin on the back side of the backing paper, it is possible to prevent the penetration of construction glue moisture into the backing paper, and to apply a coating containing a surface active component, the size of the backing paper Even in the case of a marked decrease in aldehydes, it is possible to obtain an aldehyde-adsorbing wallpaper having a sufficient open time during construction.

[Examples 1-13, Comparative Examples 1-6]
As shown in FIG. 1, a binder, porous inorganic particles, and an aldehyde adsorbent are uniformly stirred and dispersed by a lab mixer at the ratio shown in Table 1 on the surface of a backing paper 1 having a basis weight of 90 g / m ^2. The composition obtained in this way was coated with an air knife coater and then dried to form an aldehyde adsorption layer 2.
Next, on the aldehydes adsorption layer 2 obtained as described above, the decoration layer 3 having the composition shown in Table 2 is exposed from the decoration layer 3 at a ratio shown in Table 1 ( It was coated with a rotary screen printer (to 120 g / m ² when dried), dried at a temperature of 140 ° C., and then heated and foamed at a temperature of 220 ° C. to obtain an aldehyde-adsorbing wallpaper 10.

The following evaluation methods evaluated (1) aldehyde concentration reduction rate and (2) workable time (open time) in each aldehyde adsorption wallpaper of Examples 1-13 and Comparative Examples 1-6.
The results are also shown in Table 1.

(1) Aldehyde concentration reduction rate: The obtained wallpaper 10 was cut into a size of 8 × 8 cm, and the back and ends sealed with aluminum tape were put in a 3 liter capacity tetra bag, about 70 ppm Acetaldehyde gas was injected and sealed.
The acetaldehyde concentration in the tetrabag immediately after the gas was added and after 24 hours was measured, and the reduction amount was described as a rate.
(2) Evaluation criteria for open time: On the back of the obtained wallpaper 10, the construction adhesive (60% dilution of the brand name “Lure Mild” manufactured by Yayoi Chemical Industry Co., Ltd.) ) Was applied using an automatic gluing machine for wallpaper so that the coating surface was about 140 g / m ² and folded so that the coated surface was on the inside.
Check the drying condition of the adhesive every 30 minutes, and the backing papers adhere to each other with the adhesive, and when the peeling is removed, delamination of at least one backing paper occurs, or the adhesive can be dried and applied. The time until the state disappeared was measured and evaluated according to the following criteria.
○: 120 minutes or more Δ; 90 to 120 minutes ×; less than 90 minutes

In Table 1,
Each compounding quantity of a binder, an inorganic particle, and an aldehyde adsorbent shows weight% at the time of drying.
(Raw materials used)
Binder: Complete fighting type polyvinyl alcohol Inorganic particles: Aluminum silicate Aldehydes adsorbent: Product name “Diamush FC-7” manufactured by Oshika Co., Ltd.

In Table 2,
Numbers indicate parts by weight.
(Raw materials used)
DOP: Di-2-ethylhexyl phthalate ADCA: Azodicarbonamide

As a result, all the wallpaper of Examples 1-13 showed the reduction rate of the aldehyde concentration superior to the wallpaper of Comparative Examples 1, 3-6. In the wallpaper of Comparative Example 2, the result of the reduction rate of the aldehyde concentration was good, but the result of the workable time was insufficient, and the appearance of the decorative layer was also inferior in decorative design. Regarding Example 12, both evaluations were good, but some irregularities were observed on the appearance of the decorative layer, and the adhesive strength between the decorative layer and the aldehyde adsorption layer was somewhat decreased.
In each example and comparative example, acetaldehyde gas was used until the adsorptive power of the aldehyde adsorbent was saturated in a state in which acetaldehyde gas was constantly supplied in the same manner as the evaluation method of the aldehyde concentration reduction rate. When the appearance evaluation including the aldehyde adsorbing layer and the decoration layer of each sample was performed by adsorbing, yellowing occurred in the acetaldehyde adsorbing layer of each sample. I felt like I was there. Example 11 also seemed slightly discolored, but it was still usable as wallpaper. Others were not particularly discolored.

[Comparative Example 7]
A wallpaper was prepared in the same manner as in the other examples except that the same amount of the aldehyde adsorbent as in Example 8 was mixed in the decorative layer 3 without forming the aldehyde adsorbing layer on the backing paper. (1) The aldehyde concentration reduction rate was evaluated by the same criteria as in Examples 1 to 13 and Comparative Examples 1 to 6, and (2) the foaming state of the decorative layer was evaluated by the following method.

(2) Foaming condition of the decorative layer 3: The state of the foamed cell on the surface of the obtained wallpaper 10 and the appearance as the foamed decorative layer were observed with the naked eye and evaluated.

  As a result, for (1), even the wallpaper in which the aldehyde adsorbent of Comparative Example 7 is mixed in the decorative layer 3 is inferior to the wallpaper of Example 8, but the same result as in Example 4. was gotten. Regarding (2), foaming of the decorative layer 3 was inhibited, and the decorative layer 3 as in other examples could not be obtained.

Example 14
A wallpaper was prepared in the same manner as in Example 3 except that a thermoplastic synthetic resin having the following composition was coated on the back of the backing paper 1 in an amount of 2.0 g / m ^{2 in} terms of solid content. The density reduction rate and (2) workable time (open time) were evaluated according to the same criteria as in Examples 1 to 12 and Comparative Examples 1 to 6.

  Composition of the thermoplastic resin layer on the back of the backing paper 1: Complete fighting type polyvinyl alcohol (product name “Poval V” manufactured by Unitika Ltd. is diluted to 4% liquid)

  As a result, for (1), the same evaluation as that of the wallpaper of Example 3 was obtained even for the wallpaper in which the thermoplastic synthetic resin layer was provided on the back surface of the backing paper 1 of Example 12, (2) ), The wallpaper of Example 12 was in a state where it could be constructed without problems even after 120 minutes had elapsed, and was superior to the wallpaper of Example 3.

The aldehyde adsorbing wallpaper according to the present invention can adsorb aldehydes in the air effectively and adsorbs aldehydes because the adsorbent hardly permeates the backing paper despite the small amount of adsorbent. It is possible to form a beautiful decorative layer in which yellowing is not noticeable and foaming is not inhibited.
Furthermore, since the aldehyde adsorbing wallpaper according to the present invention has an exposed portion on the decorative layer, a synergistic effect with the adsorbing performance of a base material (such as a gypsum board) having an aldehyde adsorbing performance can also be obtained.
Therefore, the aldehyde adsorbing wallpaper according to the present invention can be widely used in general houses, office buildings, store buildings, commercial facilities, public facilities, and other various buildings.

It is a figure which shows one embodiment of the aldehydes adsorption wallpaper by this invention.

Explanation of symbols

10 Aldehyde adsorption wallpaper 1 Backing paper 2 Aldehyde adsorption layer 3 Decoration layer

Claims (4)

It has an aldehyde adsorption layer and a decoration layer in this order on the surface of the backing paper,
The exposed area of the aldehyde adsorption layer from the decorative layer is 10 to 70%,
The aldehyde adsorbing wallpaper, wherein the aldehyde adsorbing layer contains porous inorganic particles in a proportion of 10 to 80% by weight of the total weight of the adsorbing layer.   2. The aldehyde adsorbing wallpaper according to claim 1, wherein the average particle diameter of the inorganic particles is 0.8 to 20 [mu] m.   The aldehyde adsorbing wallpaper according to claim 1 or 2, wherein the aspect ratio of the inorganic particles is 8 or more. The aldehyde-adsorbing wallpaper according to claim 1, further comprising a thermoplastic resin layer on the back side of the backing paper.

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