WO2020044402A1

WO2020044402A1 - Coating composition for release layer formation, wallpaper including release layer, wallpaper set, and method of applying wallpaper

Info

Publication number: WO2020044402A1
Application number: PCT/JP2018/031568
Authority: WO
Inventors: 石切山　幹雄; 三郎河端
Original assignee: 有限会社中部ワークス
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2020-03-05
Also published as: JPWO2020044402A1; JP7261495B2

Abstract

A coating composition for release layer formation comprising: a natural rubber latex (A), a polyolefin-based emulsion (B), or a mixture of the natural rubber latex (A) and the polyolefin-based emulsion (B); a silicone resin emulsion (C), a fluororesin emulsion (D), or a mixture (D) of the silicone resin emulsion (C) and the fluororesin emulsion; and a wax emulsion (E). By applying the coating composition to the backing substrate of wallpaper, wallpaper including a release layer having excellent releasing properties and combining slip properties with moderate moistureproof properties was obtained.

Description

Coating release layer forming composition, wallpaper having release layer, wallpaper set, and wallpaper application method

The present invention relates to a coating composition for forming a release layer on wallpaper used as an interior material, and a wallpaper having a release layer. More specifically, the present invention provides a backing substrate used for wallpaper, for example, pulp paper (plain paper), inorganic paper, a non-woven fabric, etc., by forming a release layer on the back surface, so that it can be easily replaced when reforming or the like. The present invention relates to a coating release layer forming composition for producing a peelable wallpaper and a wallpaper having a release layer.

Conventionally, a wallpaper as a domestic interior material is made of a starch-based adhesive (hereinafter referred to as "starch-based adhesive") in accordance with Japanese Industrial Standards "JIS A6922: 2010 Starch adhesive for wallpaper construction and fittings" (hereinafter referred to as "starch adhesive"). In general, a construction method based on a so-called standard construction method (hereinafter referred to as a standard construction) is applied to a base material such as a gypsum board. When replacing such a wallpaper with a new wallpaper by reforming or changing the pattern, etc., the already pasted wallpaper must be peeled off. A backing paper having a so-called peel-up property has been used which has been improved so as to be peeled off and one side thereof remains as a thin layer on the base material.

In addition, for example, in Patent Literature 1, at least a wallpaper having a laminated structure of a backing paper and a decorative layer, and when the wallpaper is applied to a wall surface using an adhesive, the wallpaper is not separated from the wall surface. The adhesive layer is peeled off, the adhesive is a methylcellulose adhesive, the peel strength of the wallpaper from the wall is 100 to 500 g / 3 cm, and the backing paper is made of a pulp component and a synthetic resin component. A wallpaper is disclosed, which is mixed and has a delamination strength of the backing paper larger than a peel strength of the wallpaper from the wall surface.

Further, in Patent Document 2, in a nonwoven fabric for wallpaper backing having a two-layer structure including a wallpaper decoration side layer and a wall surface attaching layer, each layer contains pulp fiber, a fibrous binder, and an organic fiber. Is 18 to 30% by mass with respect to the total fibers constituting the nonwoven fabric, and contains a polyvinyl alcohol fiber as a fibrous binder on the wallpaper decoration layer side, and a coating layer mainly composed of an inorganic pigment and a polymer binder. And the coated layer has an adhesion amount of 18.5 to 25.0 g / m ² on both sides.

In Patent Document 3, a wallpaper used as a building material, particularly an interior material, is characterized in that a heat-sensitive release layer made of a polymer material and a solid plasticizer is provided on an adhesive surface opposite to a decorative surface of the wallpaper. Is disclosed.

Further, Patent Document 4 is characterized in that in a wallpaper used by being attached to a wall surface or the like, a heat-sensitive release layer containing wax and having a melting point of at least 50 ° C. to 120 ° C. is provided on the side where the wallpaper is attached. Wallpaper is disclosed.

JP 2005154968 A JP 2013181249A JP-A-7300800 JP-A-8232197

However, when the wallpaper is peeled off, a part of the wallpaper remains on the wall surface or uneven unevenness is formed on the wall surface. In such cases, it is necessary to completely remove the thin layer of the backing paper remaining on the base material during peeling. There is a problem that it takes time and effort.

In order to solve these problems, wallpapers called fleece wallpapers developed in Europe and mainly Germany in recent years have attracted attention and are being introduced to Japan. This fleece wallpaper uses a mixed paper made of a pulp component and a synthetic resin component as the backing paper, and further applies a methylcellulose-based adhesive with low adhesive strength to the wall as the application glue. The peeling is facilitated by using the method. Patent Document 1, which has the same concept as fleece wallpaper, uses a mixed paper of a pulp component and a synthetic resin component as a backing paper for wallpaper, and applies a methylcellulose-based adhesive to the back surface or wall surface of the backing paper for construction. It is characterized in that the peeling from the wall surface is peeled off by an adhesive layer when peeling off. Further, Patent Document 2 discloses a nonwoven fabric for wallpaper backing having a two-layer structure including a wallpaper decoration side layer and a wall surface attaching layer, Each layer contains pulp fiber, fibrous binder, and organic fiber. Even though it has a two-layer structure, no peeling occurs between layers of the nonwoven fabric, and the wallpaper does not remain on the wall when peeling off the wallpaper. Has been proposed.

However, the techniques described in

Patent Documents

1 and 2 have the following problems.
1) Synthetic resin components, fibrous binders, and organic fibers used in

Patent Literatures

1 and 2 have a long fiber length as a fiber used for backing wallpaper, and generate fluff on the surface. When applying paste paint, defective phenomena such as pinholes, bumps, and depressions are likely to occur.
2) The wallpaper produced in Patent Literature 1 and Patent Literature 2 does not come off when glued with the starch-based adhesive generally used in Japan, and a special methylcellulose-based adhesive is applied to a gypsum board. In Japan, there is a problem in that it is not peeled off unless it is adhered by a special construction method.
3) As a backing substrate for wallpaper, the unit price is several times higher than that of conventional pulp paper, and it does not become a commodity in a general-purpose price range.
4) The adhesive and construction method used are special for the domestic market and are difficult to spread.

As another prescription, Patent Document 3 or Patent Document 4 discloses a wallpaper in which a heat-sensitive release layer made of a polymer material and a solid plasticizer is provided on the adhesive surface opposite to the decorative surface of the wallpaper, and a wallpaper-attaching surface. A wallpaper has been proposed which has on its side a heat-sensitive release layer containing at least 50-120 ° C. containing wax.
In addition, the techniques described in Patent Literature 3 and Patent Literature 4 have the following problems.
Patent Literature 3 and Patent Literature 4 predict that, when the wallpaper is peeled off, it is necessary to continuously heat the surface of the heat-sensitive peeling layer at a temperature equal to or higher than the melting point, which is more troublesome and expensive than the conventional peeling work. It is questioned whether it is possible to continuously heat the wall at 50 ° C. or more at the site of the above.
The present invention has been made in view of such a problem in the related art, and provides a wallpaper which can be easily peeled off even if it is stuck by a conventional standard construction method.

That is, the object of the present invention is to apply the starch-based adhesive generally used in Japan to the backing substrate side of the wallpaper and stick it to the wall surface, it is possible to use so-called standard construction, and An object of the present invention is to provide an easy-to-process and inexpensive release layer forming composition for coating and a wallpaper having a release layer regardless of the type of backing substrate.

The present inventors, a specific natural rubber latex or polyolefin-based emulsion, or a mixture of natural rubber latex and a polyolefin-based emulsion, a silicone resin emulsion, or a fluororesin emulsion, or a mixture of a silicone resin emulsion and a fluororesin emulsion , A composition containing a wax emulsion, a releasability, a slipperiness and a film having an appropriate moisture-proof property can be formed, and as a result of intensive studies, it was found that the above-mentioned problem could be solved. The present invention has been completed.

The coating release layer forming composition according to the present invention is a natural rubber latex, a polyolefin-based emulsion, or a mixture of a natural rubber latex and a polyolefin-based emulsion, a silicone resin emulsion, or a fluororesin emulsion, or a silicone resin emulsion. It comprises a mixture with a fluororesin emulsion and a wax emulsion.

Preferably, the natural rubber latex is an organic peroxide prevulcanized natural rubber latex, and the polyolefin-based emulsion is at least one selected from the group consisting of a polypropylene emulsion, a polyethylene emulsion and an ethylene-propylene copolymer emulsion. Emulsion.

Preferably, the solid content of the natural rubber latex is 21 to 54 parts by mass, and the solid content of the polyolefin-based emulsion is 6 to 28 parts by mass, based on 100 parts by mass of the total components of the coating release layer forming composition. Department.

Preferably, the total solid content of the mixture of the natural rubber latex and the polyolefin-based emulsion is 9 to 45 parts by mass, based on 100 parts by mass of the total components of the coating release layer forming composition. The solid content of the natural rubber latex is 6 to 42 parts by mass, and the solid content of the polyolefin emulsion is 3 to 21 parts by mass.

Preferably, the solid content of the silicone resin emulsion is 0.5 to 10 parts by mass and the solid content of the fluororesin emulsion is 0 to 100 parts by mass based on 100 parts by mass of the total components of the coating release layer forming composition. 2 to 5 parts by weight, the solid content of the mixture of the silicone resin emulsion and the fluororesin emulsion is 0.5 to 10 parts by weight, and the solid content of the wax emulsion is 2 to 15 parts by weight. is there.

Further, the wallpaper having a release layer according to the present invention is a wallpaper in which a release layer is formed on the back surface of a backing substrate, and the release layer is a coating material according to any one of claims 1 to 5. It is characterized by being formed with the composition for forming a release layer for industrial use.

Further, the wallpaper set according to the present invention includes a wallpaper having a release layer on the back surface of the backing substrate, an adhesive applied to the surface of the release layer, and a release film bonded to the adhesive. The release layer is a natural rubber latex, a polyolefin-based emulsion, or a mixture of a natural rubber latex and a polyolefin-based emulsion, a silicone resin emulsion, or a fluororesin emulsion, or a mixture of a silicone resin emulsion and a fluororesin emulsion. , A wax emulsion, and a coating release layer-forming composition containing the composition.

Further, the method for applying wallpaper according to the present invention is a step of applying an adhesive to the surface of the release layer of the wallpaper having a release layer on the back surface of the backing substrate, and applying the adhesive-coated wallpaper to the base substrate. The release layer is formed of a natural rubber latex, a polyolefin-based emulsion, or a mixture of a natural rubber latex and a polyolefin-based emulsion, a silicone resin emulsion, or a fluororesin emulsion, or a silicone resin emulsion and a fluorine-containing emulsion. It is formed by a coating release layer-forming composition containing a mixture with a resin emulsion and a wax emulsion.

Preferably, a step of peeling off the wallpaper stuck to the base material at the interface between the release layer and the adhesive, and applying the adhesive without performing repair and adjustment of the base material from which the wallpaper has been peeled off Attaching the wallpaper to the base material.

剥離 The release layer forming composition for coating obtained by the present invention is inexpensive, has good processability, and can provide a wallpaper having an excellent release layer by being applied to a backing substrate of the wallpaper. The obtained wallpaper has good releasability and does not require any special construction work when replacing the wallpaper by renovation or the like, so that it has a remarkable effect in shortening the work time, pasting, and the like.

It is a side sectional view of wallpaper P which has release layer 3 of this embodiment. FIG. 2A is a side cross-sectional view showing a state in which wallpaper P having a release layer of the present embodiment is adhered to an underlying substrate via an adhesive, and FIG. It is a sectional side view showing the state where the wallpaper P having the release layer of the present embodiment, which was attached, was peeled off at the interface between the release layer and the adhesive. In Examples 1 to 9, the proportions of the coating release layer forming composition forming the release layer 3 and the evaluation results of the wallpapers P1 to P9 having the release layer coated with the coating release layer forming composition were evaluated. FIG. Example 10 to Example 18, the mixing ratio of the coating release layer forming composition for forming the release layer 3 and the evaluation results of the wallpaper P10 to P18 having the release layer coated with the coating release layer forming composition. FIG. In Comparative Examples 1 to 4, the mixing ratio of the release layer forming composition for coating forming the release layer 3 and the evaluation results of the wallpapers P19 to P22 having the release layer coated with the release layer forming composition for coating FIG. FIG. 3 is a side sectional view of a wallpaper set N having a release film 6. 9 is a flowchart illustrating a method of replacing wallpaper P.

Hereinafter, the present embodiment will be described with reference to the drawings.
First, the configuration of the wallpaper P will be described.
FIG. 1 is a side sectional view of a wallpaper P having a release layer of the present embodiment (hereinafter referred to as the wallpaper P).
As illustrated in FIG. 1, the wallpaper P is provided with a decorative layer 2 such as a vinyl chloride layer on the surface of a backing substrate 1 and a release layer 3 on the back surface of the backing substrate 1. The back surface of the backing substrate 1 refers to the surface opposite to the surface on which the decorative layer 2 is provided.

[Backing substrate 1]
The backing substrate 1 is a smooth, sheet-like substrate such as pulp paper (plain paper), inorganic paper, or nonwoven fabric, and the material is not particularly limited as long as it is smooth.
[Cosmetic layer 2]
The decorative layer 2 is composed of, for example, a vinyl chloride layer. Although the decorative layer 2 is not particularly limited, a layer in which a vinyl chloride resin layer or an olefin resin layer is laminated on the backing substrate 1 and a pattern is provided by printing if necessary, Those that give a feeling are given.

[Release layer 3]
The release layer 3 is formed by applying and drying the release layer forming composition for coating according to the present embodiment on the entire back surface of the backing substrate 1. The coating release layer forming composition is composed of a main component and an auxiliary component. The main components include a natural rubber latex (A) and a polyolefin-based emulsion (B). The auxiliary component includes a silicone resin emulsion (C), a fluororesin emulsion (D), or a mixture (D) of a silicone resin emulsion (C) and a fluororesin emulsion, and a wax emulsion (E). In.

First, the main components in the coating release layer forming composition will be described.
(Natural rubber latex (A))
The natural rubber latex (A) used in the present embodiment is a natural rubber latex or a modified natural rubber latex, and these natural rubber latexes alone or in a mixture can be used. The natural rubber latex is a concentrated latex that has been added to a fresh latex collected from a rubber tree to prevent coagulation by adding a preservative, and then concentrated and stored by a centrifugation method to be stabilized. What pre-vulcanized (pre-crosslinked) this organic rubber latex using an organic peroxide is an organic peroxide pre-vulcanized natural rubber latex. In general, compared to sulfur-based vulcanized natural rubber, organic peroxide pre-crosslinked natural rubber has polymer chains linked by CC (carbon-carbon) bonds, and thus is compared to sulfur-based vulcanized natural rubber. Excellent aging resistance. Therefore, it is preferable to use an organic peroxide prevulcanized natural rubber latex. Furthermore, the pre-vulcanized natural rubber latex of organic peroxide contains about 0.4 to 0.7% of ammonia as a preservative, and the ammonia content is reduced to about 0.1% from the viewpoint of safety. It is most preferable to use a low ammonia type organic peroxide pre-vulcanized natural rubber latex.

In the present embodiment, a commercially available product may be used as the natural rubber latex (A). Specific examples of the natural rubber latex are product names manufactured by Retex Co., Ltd., in which natural rubber latex is an organic peroxide prevulcanized natural rubber. SS-58 and SS-58ULA, a product name of Redox, a low ammonia type organic peroxide pre-vulcanized natural rubber latex, etc.

Such a natural rubber latex (A) is used for imparting film properties to the formed release layer. As described above, at least one type of latex selected from the group consisting of natural rubber latex, modified natural rubber latex alone and a mixture thereof can be selected, but natural stability is considered in consideration of mechanical stability, environmental consideration, unit price, and the like. It is preferable to select a rubber latex, and further, it is preferable to select an organic peroxide prevulcanized natural rubber latex having excellent mechanical stability, strong film strength, and excellent aging resistance. When the natural rubber latex (A) is used alone, the solid content is in the range of 21 to 54 parts by mass, preferably 30 to 40 parts by mass based on 100 parts by mass of the total components of the coating release layer forming composition. It is. If the solid content is less than 21 parts by mass, the releasability deteriorates, and if it exceeds 54 parts by mass, the mechanical stability of the paint is poor, affecting the productivity, and further, the slipperiness of the formed release layer surface is reduced, and the Handling becomes poor.

(Polyolefin emulsion (B))
The polyolefin-based emulsion (B) used in the present embodiment is not particularly limited, and a conventionally known polyolefin-based emulsion can be used. Examples of the polyolefin-based emulsion (B) include those in which a polyolefin having a hydrophilic group introduced therein is dispersed in water. Examples of the hydrophilic group include a carboxyl group, a sulfonic group, a phosphoric group, a hydroxyl group, and an amino group. Further, as the polyolefin-based emulsion (B), an emulsion obtained by dispersing a polyolefin in water with an emulsifying dispersant can also be used. Specific examples of the polyolefin-based emulsion (B) preferably include, for example, a polypropylene emulsion, a polyethylene emulsion, and an ethylene-propylene copolymer emulsion. These may be used alone or in combination of two or more.

The polypropylene, polyethylene and ethylene-propylene copolymer preferably have a melting point of 90 to 150 ° C. and have a weight average molecular weight of 1,000 to 1,000,000. In addition, in this specification, the melting point refers to a value measured by a softening point test method (ring and ball method) specified in JIS K2207.

In the present embodiment, a commercially available product may be used as the polyolefin-based emulsion (B), and specific examples thereof include PP emulsion manufactured by Maruyoshi Chemical Co., Ltd., and HARDLEN-NZ (registered trademark) manufactured by Toyobo Co., Ltd. (Trademark) and polyethylene emulsions include JW-150 manufactured by Toyobo Co., Ltd. manufactured by Johnson Polymer Co., and PE401 manufactured by Naruse Chemical Co., Ltd. Further, examples of the ethylene-propylene copolymer emulsion include HS manufactured by Redtex Co., Ltd. Can be

These polyolefin-based emulsions (B) are used for imparting film properties to a release layer formed in the same manner as the natural rubber latex (A). As described above, at least one emulsion selected from the group consisting of a polypropylene emulsion, a polyethylene emulsion, and an ethylene-propylene copolymer emulsion can be selected, but the compatibility with the natural rubber latex (A), the mechanical stability, and the releasability. It is preferable to select in consideration of the unit price and the like. When the polyolefin-based emulsion (B) is used alone, the solid content is in the range of 6 to 28 parts by mass, preferably 9 to 15 parts by mass based on 100 parts by mass of the total components of the coating release layer forming composition. It is. If the solid content is less than 6 parts by mass, the film properties are inferior and the releasability deteriorates, and if it exceeds 28 parts by mass, not only the unit price is increased, but also the silicone resin emulsion (C) or fluororesin emulsion (D) used together, or The amount of the mixture (D) of the silicone resin emulsion (C) and the fluororesin emulsion or the amount of the wax emulsion (E) is reduced, which affects the releasability.

In the present embodiment, a mixture of the natural rubber latex (A) and the polyolefin-based emulsion (B) can be used. Natural rubber latex (A) has a high solid content and excellent film properties, and is inexpensive but has poor mechanical stability and poor sliding properties of the film. Conversely, the polyolefin-based emulsion (B) is excellent in mechanical stability and film slipperiness, but has the disadvantage of a high unit price. In the present embodiment, in the case of a mixture blend that makes use of the respective advantages of the natural rubber latex (A) and the polyolefin-based emulsion (B), the total solid content is reduced to 100 parts by mass of the total components of the coating release layer forming composition. 9 to 45 parts by mass, the solid content of the natural rubber latex (A) is 6 to 42 parts by mass, and the solid content of the polyolefin emulsion (B) is 3 to 21 parts by mass. preferable. More preferably, the total solid content is 12 to 27 parts by mass, the solid content of the natural rubber latex (A) is 6 to 18 parts by mass, and the solid content of the polyolefin emulsion (B) is 6 to 9 parts by mass. It is. When the total solid content is less than 9 parts by mass, the releasability is poor, and when the total solid content exceeds 45 parts by mass, not only the unit price increases, but also the paint thickens and gelation easily occurs.

Next, auxiliary components in the coating release layer forming composition will be described.
(Silicone resin emulsion (C))
The silicone resin emulsion (C) used in the present embodiment is obtained by dispersing dimethyl silicone oil, various modified silicone oils, silicone resin, silicone elastomer powder, film-forming silicone, and the like in water using a surfactant. It is used to exhibit slipperiness and releasability in the release layer to be formed. As the silicone resin emulsion (C), a dimethyl silicone emulsion, a modified silicone emulsion, a film-forming silicone emulsion, etc. having excellent slipperiness and releasability are preferred, and they can be used alone or as a mixture of two or more. Can also be used.

In the present embodiment, a commercially available product may be used as the silicone resin emulsion (C). Specific examples thereof include dimethyl silicone emulsion, KM-740T manufactured by Shin-Etsu Chemical Co., Ltd. and SM manufactured by Toray Dow Corning Co., Ltd. -490EX, modified silicone emulsion: X-52-8046 manufactured by Shin-Etsu Chemical Co., Ltd .; SM-7002EX manufactured by Toray Dow Corning Co .; film-forming silicone emulsion: KM-2002T, manufactured by Shin-Etsu Chemical Co., Ltd. And IE-7170 manufactured by the company.

The solid content of the silicone resin emulsion (C) in the total component amount of 100 parts by mass of the coating release layer forming composition of the present embodiment is 0.5 to 10 parts by mass, preferably 2 to 6 parts by mass. is there. If the solid content is less than 0.5 part by mass, the releasability and slipperiness will be poor, and if it is 10 parts by mass or more, the wettability of the paint will be poor, making it difficult to form a uniform release layer.

(Fluororesin emulsion (D))
The fluororesin emulsion (D) used in the present embodiment includes a compound containing a long-chain perfluoroalkyl group, polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, vinyl ether-fluoroolefin copolymer, vinyl ester-fluoroolefin. Fluoro groups such as copolymers, tetrafluoroethylene-vinyl ether copolymers, chlorotrifluoroethylene-vinyl ether copolymers, polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymers, ethylene-tetrafluoroethylene copolymers, ethylene-chlorotrifluoroethylene copolymers, etc. An emulsion obtained by dispersing a polymer containing water in water is preferable, and one type of polymer may be used alone, or two or more types may be mixed. It can also be used.

In the present embodiment, a commercially available product may be used as the fluororesin emulsion (D), and specific examples thereof include Kufuki series of Daikin Industries Co., Ltd. and Lumiflon series of Asahi Glass Co., Ltd. Can be.

において In the present embodiment, a mixture of the silicone resin emulsion (C) and the fluororesin emulsion (D) can be used. The silicone resin emulsion (C) is excellent in slipperiness, releasability, weather resistance, etc. On the other hand, the fluororesin emulsion (D) has water repellency, oil repellency, releasability, etc. Although it is excellent in antifouling property, etc., it has a disadvantage that the unit price is high. In the case of a mixed composition that takes advantage of the respective advantages, the solid content of the silicone resin emulsion (C) and the fluorine resin emulsion (D) is 0.5 to 100 parts by mass of the total components of the coating release layer forming composition. The amount is preferably 10 parts by mass, the solid content of the silicone resin emulsion (C) is in the range of 1 to 8 parts by mass, and the solid content of the fluororesin emulsion (D) is in the range of 0.2 to 5 parts by mass. .

(Wax emulsion (E))
In this embodiment, a wax emulsion (E) is used in combination with the silicone resin emulsion (C) or the fluororesin emulsion (D). The wax emulsion (E) is mainly used for imparting moisture resistance to the formed release layer, but at the same time, the releasability and slipperiness of the expensive silicone resin emulsion (C) and fluorine resin emulsion (D). It is a necessary component for the purpose of supplementing and reducing the cost. The wax emulsion (E) is an emulsion containing a wax component as a dispersoid, and the wax component serving as a dispersoid is a modified wax component such as a polypropylene wax, a polyethylene wax, a paraffin wax, a microcrystalline wax or a maleated petroleum resin. A known wax component or the like may be used alone, or two or more kinds may be used in combination. Above all, paraffin wax is preferable in terms of cost because it has good moisture resistance and smoothness.

樹脂 The mass average molecular weight of the resin used in the wax emulsion (E) is preferably 30,000 or less, more preferably 20,000 or less. If the weight average molecular weight exceeds 30,000, the surface smoothness may not be significantly improved, which is not preferable. Further, the melting point of the wax is preferably from 40 to 120 ° C. If the melting point is lower than 40 ° C, a wax layer cannot be formed on the surface of the release layer to deteriorate the moisture-proof property. And the production speed is slow, and the productivity is poor.

The wax emulsion (E) has a solid content of 2 to 15 parts by mass, preferably 4 to 8 parts by mass, based on 100 parts by mass of the total components of the coating release layer forming composition. When the solid content is less than 2 parts by mass, the release layer formed on the wallpaper cannot exhibit moisture resistance, and when the amount is 15 parts by mass or more, the wax component adheres to the surface of the release layer in a powder form and powder fall occurs. In addition, the moisture resistance becomes too high, causing problems such as blisters when installing wallpaper.

Further, a dispersant, a surface conditioner, an antifoaming agent, a thickener, a water retaining material, a preservative, and the like can be added to the coating release layer forming composition of the present embodiment as needed. Specifically, the dispersant improves the dispersibility of the silicone resin emulsion (C), the fluororesin emulsion (D), and the wax emulsion (E), and the dispersant used is not particularly limited. Examples include anionic, cationic or amphoteric surfactants, and acrylic copolymers. The surface conditioner improves the wettability of the coating release layer forming composition, and is appropriately selected from a modified silicone-based, acetylene-based, and acrylic-based surface conditioner. When forming a release layer on the wallpaper, the thickener is used to give the coating release layer forming composition an appropriate viscosity by a coating method. Examples of the thickener include polyether-based, urethane-modified polyether-based, modified polyacrylic-acid-based, PVA, casein, starch, methylcellulose (MC), carboxymethylcellulose (CMC), and the like. Examples of the preservative include MIT (methyl isothiazoline), BIT (benzoisothiazoline), and triazine.
As described above, the release layer 3 includes the main component and the auxiliary component.

The coating amount (wet conversion) of the coating release layer forming composition for forming the release layer 3 is preferably 3 to 25 g / m ² , more preferably 5 to 11 g / m ² . When the coating amount is less than 3 g / m ² , the releasability is inferior. When the coating amount is more than 25 g / m ² , not only the cost is increased but also the moisture resistance and the water repellency are too strong, so Problems such as cissing occur. In the case of the recommended method of applying the coating release layer forming composition to the backing substrate 1 surface of the already manufactured wallpaper, the release layer 3 is formed under the condition that the surface shape of the wallpaper P does not collapse after coating. It is necessary to dry. For example, in the case of wallpaper formed of a thermoplastic resin such as vinyl wallpaper, the release layer 3 varies depending on the amount of application, but the temperature conditions under which the shape of the decorative layer 2 as a vinyl layer does not collapse, preferably 70 ° C. to 90 ° C. C. for 5 to 30 seconds.

In this way, the wallpaper P is applied to the release layer 3 on the entire back surface of the backing substrate with the coating release layer forming composition. The wallpaper P may be any material as the backing substrate 1 as long as it is a smooth substrate such as pulp paper (plain paper), inorganic paper, or nonwoven fabric. The coating apparatus is not particularly limited and can be performed by a known method using a roll coater, a blade coater, an air knife coater, a gravure coater, a rotary screen, or the like, but a gravure coater is preferable in terms of both equipment and work. . Further, the wallpaper P may be formed by applying and drying the release layer 3 on the back surface of the backing substrate 1 in advance. However, the wallpaper P may be used for coating depending on the processing conditions for manufacturing the wallpaper (heating conditions, form of processing apparatus, etc.). The selection range of the release layer forming composition and the processing conditions is narrowed. Therefore, it is preferable to apply the coating release layer forming composition to the surface of the backing substrate 1 already manufactured as wallpaper, and if the backing substrate 1 is almost smooth, the release layer can be applied to any type of wallpaper. 3 can be formed.

The wallpaper P is excellent as a material for forming a peeling layer of wallpaper as an interior material because the wallpaper P has excellent peelability, has good workability, and can form the peeling layer 3 at low cost. The wallpaper P having the release layer 3 manufactured in the present embodiment is a so-called standard using the starch-based adhesive commonly used for wallpaper and applying the starch-based adhesive to the backing paper side of the wallpaper. It has the performance that it can be easily peeled off even if it is attached by construction.

Next, the use state of the wallpaper P will be described.
FIG. 2A is a side cross-sectional view of the wallpaper P of the present embodiment, in which an adhesive 4 is applied on a release layer 3 and attached to a base substrate 5.
As illustrated in FIG. 2A, the wallpaper P is adhered to a base substrate 5 by applying an adhesive 4 on a release layer 3. The adhesive 4 mainly includes the starch-based adhesive, but is not particularly limited thereto, and a water-soluble adhesive such as a methylcellulose-based adhesive or a gelatin-based adhesive is suitable. In addition, any other adhesive can be used as long as the adhesive has a condition that the adhesive 4 penetrates the release layer 3 and does not reach the backing substrate 1.

FIG. 2B is a side cross-sectional view showing a state in which the wallpaper P of the present embodiment adhered to the base material 5 is peeled off at the interface between the release layer 3 and the adhesive 4.
As illustrated in FIG. 2B, the wallpaper P can be peeled off at the interface between the release layer 3 and the adhesive 4.
As described above, the wallpaper P obtained in the present embodiment is designed so as to be peeled off at the interface between the formed peeling layer 3 and the adhesive 4 when peeled off. The thin backing substrate 1 thus formed does not remain, and a smooth base material can be reproduced.

Hereinafter, the present embodiment will be specifically described with reference to examples, but the present invention is not limited to the following examples. In Examples, "parts" are all based on mass.
(1) Production Examples of Wallpaper 1 and Wallpaper 2 A pulp paper having a basis weight of 65 g / m ² (hereinafter referred to as the pulp paper) is used as a backing substrate 1, and a decorative layer 2 which is a vinyl chloride resin containing a foaming agent is added to the pulp paper. After coating and foaming, this was embossed to obtain wallpaper 1. Further, as a backing substrate 1 based on [Patent Document 2] JP-A-2013-181249, a mixed paper of a pulp component having a basis weight of 85 g / m ² and polyester fiber (hereinafter referred to as the mixed paper) is used. After coating and foaming the decorative layer 2 which is a vinyl chloride resin containing a foaming agent, this was embossed to obtain wallpaper 2. At this time, fluffs and pinholes, which become design problems, were generated due to the fluffing of the mixed paper.

(2) Examples of main components and auxiliary components prepared in the release layer forming composition for coating forming the release layer 3 Examples of main components 1 of the release layer forming composition for coating include natural rubber latex (A): organic peroxide. Precured vulcanized crosslinked natural rubber latex (SS-58ULA, manufactured by Redtex Co., Ltd., solid content: 58%), polyolefin emulsion (B): polypropylene emulsion (PP emulsion, manufactured by Maruyoshi Chemical Co., solid content: 30%), major As component 2, silicone resin emulsion (C): dimethyl silicone emulsion [SM-490EX manufactured by Toray Dow Corning Co., Ltd., solid content 36%], (D) fluororesin emulsion [Lumiflon FE4300 manufactured by Asahi Glass Co., Ltd., solid content 50] %], Wax emulsion (E): paraffin wax emulsion [Nippon Seiro Co., Ltd. Of EMUSTAR-1155, 40% solids, was prepared mp 69 ° C.].
Further, as auxiliary components, dispersant: acrylic copolymer [Disperbyk-2015], surface conditioner: modified silicone (BYK-349 manufactured by BYK Japan KK), defoamer: hydrophobic silica [SN manufactured by San Nopco, Inc.] Deformer 113], thickener: urethane-modified polyether type [SN thickener 612 manufactured by San Nopco Co., Ltd.] was prepared.

Next, Examples 1 to 18 will be described.
FIGS. 3 and 4 show the mixing ratio of the coating release layer forming composition for forming the release layer 3 in Examples 1 to 18 and the release layer 3 coated with the coating release layer forming composition. FIG. 6 is a diagram showing evaluation results of wallpaper P1 to P18.

[Example 1]
As shown in FIG. 3, 8 parts of dimethyl silicone emulsion (SM-490EX) and 15 parts of paraffin wax emulsion (EMUSTAR-1155) are added to 17.6 parts of water, and an acrylic copolymer (Disperbyk) is further used as a dispersant. After adding 0.5 parts of -2015), the mixture was sufficiently stirred with a homomixer. Then, 58 parts of organic peroxide prevulcanized natural rubber latex (SS-58ULA), 0.5 parts of modified silicone (BYK-349) as a surface conditioner, and hydrophobic silica (SN deformer) as an antifoaming agent 113), and 0.2 part of a urethane-modified polyether-based (SN thickener 612) as a thickener, and further stirred and adjusted with a homomixer to obtain a coating release layer. The solid content of the organic peroxide pre-vulcanized natural rubber latex (A) of the main component 1 of the forming composition (hereinafter referred to as the composition) was 34.8 parts, and the viscosity was 210 mPa · s / 25 ° C.
The composition was applied onto the backing substrate of the wallpaper 1 obtained in the above Production Example so as to have a weight of 8 g / m ² · wet using a gravure printer, and dried for 15 seconds using a hot-air dryer at 80 ° C. Wallpaper P1 having a release layer (hereinafter referred to as wallpaper P1) was obtained. At this time, the mechanical stability of the composition was as good as 0.09%, and the slipperiness of the release layer of the wallpaper was also very good. On the release layer of the wallpaper P1 thus obtained, 150 g / m ^{2 of the} starch-based adhesive [Lure Mild manufactured by Yayoi Chemical Industry Co., Ltd.] was applied, and a gypsum board as a base material [Yoshino Gypsum Co., Ltd.] Tiger board]. After one week without the occurrence of blisters after the application, when the wallpaper P1 was peeled off when the adhesion state was stabilized, the wallpaper P1 was easily peeled off without the thin layer of the backing substrate 1 remaining on the base substrate. And the peelability was very good.

[Example 2]
The same procedure as in Example 1 was carried out except that 5 parts of a fluororesin emulsion (Lumiflon FE4300) was used instead of the dimethyl silicone emulsion of Example 1. The results are as shown in FIG. 3. The mechanical stability was as good as 0.06%, and the other results were very good.

[Examples 3 to 15]
In the same manner as in Example 1, the composition was obtained according to the compounding ratios shown in FIGS. The total solid content and viscosity of the main component 1 of the obtained composition were as shown in FIGS. Subsequently, the wallpaper P3 to the wallpaper P15 were manufactured under the same conditions as in Example 1, and were similarly evaluated. The results are as shown in FIGS. 3 and 4, and the wallpapers P10 to P12 of Examples 10 to 12 were in a state where the peeling was slightly heavy, but all others were very good to good.
The wallpapers P10 to P12 in Examples 10 to 12 are the lowest cost formulas, and the wallpapers P13 to P15 in Examples 13 to 15 are the highest cost formulas.

[Examples 16 to 18]
As illustrated in FIG. 4, the composition was obtained in the same manner as in Example 1 with the mixing ratio shown in FIG. 4. The total solid content and viscosity of the main component 1 of the obtained composition were as shown in FIG. Subsequently, wallpapers P16 to P18 of the wallpaper 2 were produced on the backing substrate 1 of the wallpaper 2 under the same conditions as in Example 1 and evaluated similarly. The results were very good as shown in FIG.

Next, Comparative Examples 1 to 4 will be described.
FIG. 5 shows the mixing ratio of the coating release layer forming composition for forming the release layer 3 in Comparative Examples 1 to 4 and the wallpaper P19 having a release layer coated with the coating release layer forming composition. It is a figure which shows the evaluation result of P22.

[Comparative Example 1]
As shown in FIG. 5, the composition was prepared by mixing the main component 2 of Example 1 with the exception of the wax emulsion (E) in 32.6 parts of water and mixing other main components and auxiliary components in the same manner as in Example 1. I got The solid content of the organic peroxide prevulcanized natural rubber latex of the main component 1 of the obtained composition was 33.6 parts and the viscosity was 240 mPa · s / 25 ° C. Subsequently, the wallpaper P19 was manufactured under the same conditions as in Example 1 and evaluated in the same manner. As a result, the wallpaper P19 had slightly poor releasability as shown in FIG. 5, and a thin layer of the backing substrate was partially left on the underlying substrate. It is presumed that removal of the wax emulsion (D) deteriorated the releasability.

[Comparative Examples 2-3]
As shown in FIG. 5, the silicone resin emulsion (C) or the fluororesin emulsion (D) was removed from the main component 2 of Example 1, and the other main components and auxiliary components were blended in the same manner as in Example 1 to obtain a mixture. A composition was obtained. The wallpapers P20 to P21 were manufactured under the same conditions as in Example 1 and evaluated in the same manner. As a result, the wallpaper P20 to P21 had slightly poor releasability as shown in FIG. 5, and a thin layer of the backing substrate partially remained on the underlying substrate. It is presumed that removal of the silicone resin emulsion (C) or the fluororesin emulsion (D) deteriorated the releasability.

[Comparative Example 4]
As illustrated in FIG. 5, for the wallpaper P22, the starch-based adhesive used in Example 1 was applied to the backing substrate of the wallpaper 2 having no release layer, and evaluated in the same manner as in Example 1. As a result, the wallpaper P22 had poor releasability as shown in FIG. 5, and a thin layer of the delaminated base material remained on the front surface of the base material.

Next, an evaluation method for the wallpaper P1 to the wallpaper P22 in the examples illustrated in FIGS. 3 to 5 and the comparative example will be described.
[Evaluation method]
(1) Sliding property of release layer A test specimen of 20 cm × 20 cm was left in a constant temperature and humidity chamber of 25 ° C. and 50% for 2 hours, taken out, and evaluated for slipping property by finger touch.
：: Very good slipperiness and smooth feeling 〇: Good slipperiness Δ: Slightly poor ×: Poor slipperiness (2) Mechanical stability of coating release layer forming composition JIS K 6392 Using the "Malone mechanical stability tester" specified in (Testing method for NBR synthetic latex), measure the coagulated content in the latex after treating for 10 minutes at a load of 15 kg and a rotation speed of 1,000 rpm. I do.
◎: Coagulated material is less than 0.05% 〇: Coagulated material is from 0.05% to less than 0.1% Δ: Coagulated material is from 0.1% to less than 1% ×: Coagulated material is 1% or more (3) Wallpaper starch based adhesive pursuant to JIS A6922 to the test of peelability width 45cm × length 60cm the [Yayoikagakukogyo Co. luer mild] 150 g / ^{m 2} was applied, 90cm × 90cm plasterboard ( (Underlying substrate). After a lapse of one week, the test piece is peeled off at a width of 45 cm, and the peelability and the state of the base material 5 are evaluated.
◎: very good releasability, the backing substrate 1 does not remain on the underlying substrate 5 〇: slightly releasable, the backing substrate 1 does not remain on the underlying substrate 5 〇 △: releasability is slightly heavy Or the releasability is hard, and the backing substrate 1 does not remain on the underlying substrate 5 .DELTA .: The releasability is slightly good, but an adhesive trace remains on the underlying substrate 5. .DELTA.x: The releasability is slightly poor, and partially. The backing substrate 1 remains on the base substrate 5 .times .: The peelability is poor, and the backing substrate 1 remains on the entire surface of the base substrate 5 (4) Generation of blisters A test specimen having a width of 90 cm and a length of 170 cm conforms to JIS A6922. The occurrence of blisters one week after immediately applying a starch-based adhesive (Lure Mild manufactured by Yayoi Chemical Industry Co., Ltd.) at 150 g / m ^{2 and} pasting it on a gypsum board (base substrate 5) of 90 cm × 180 cm. Check visually.
◎: No blistering occurred 〇: Almost no blistering Δ: Partly blistering occurred ×: Blurring occurred on the entire surface

Next, the wallpaper set will be described.
In the conventional work, a sizing machine, a glue bucket, a glue stirrer, a glue material, an electric drum, an extension cord, etc. must be carried into the site, and in addition, a work space for installing tools on the site is required. Was also mandatory. Depending on the site, the carry-in route is long and there is a time limit, so it is necessary to perform on-site work such as installation of glued machines, gluing work at the site, and cleaning time for glued machines. There is a current situation where time is devoted to the actual work time.
Therefore, in order to solve these problems, the present invention provides a wallpaper set that can be carried to the site in a state where the wallpaper P has a paste in advance.
FIG. 6 is a diagram illustrating a cross-sectional view of the wallpaper set N.
As illustrated in FIG. 6, the wallpaper set N includes a wallpaper P, an adhesive 4, and a release film 6. The release film 6 is a film that protects the adhesive 4 and prevents the moisture of the adhesive 4 from evaporating. The release film 6 has a base material film surface coated with a release agent. The release agent in this example is a silicone-based release agent. The release film 6 is adhered to the wallpaper P via the adhesive 4. The release film 6 has excellent releasability from the adhesive 4 and can be peeled off from the wallpaper P without leaving the adhesive 4 on the release film 6. That is, the adhesive 4 applied to the wallpaper P does not peel off with the peeling of the release film 6, and the adhesive strength when the wallpaper P is applied to the wall does not weaken. Further, since the adhesive 4 is covered with the release film 6, the adhesive 4 is not easily dried, and can maintain its performance in a packaged state in a cool and dark place for about 2 to 3 weeks.

Next, a method of applying the wallpaper P will be described.
In the conventional wallpaper replacement, first, an operator peels off the existing wallpaper to expose the underlying substrate surface. The paper stuck to the base may be removed by applying water and dampening it, or by using a wallpaper peeling machine. Next, when the base boards are damaged or the like, the operator repairs the base by embedding and mounting boards of the same thickness. Then, the number of putty sanders applied to the base and the sealer are determined according to the relationship between the state in which the existing wallpaper is removed and the wallpaper to be pasted, and the base is adjusted. Thereafter, an adhesive is applied to the wall, and the wallpaper is attached. As described above, when the conventional wallpaper is used, it is necessary to peel off the remaining wallpaper or to process the background.

FIG. 7 is a flowchart illustrating the replacement process (S20) using the wallpaper P.
On the other hand, in the replacement process using the wallpaper P of the present example, in step 200 (S200), the operator peels the wallpaper P from the wall. When peeling, the wallpaper P is peeled off at the interface between the release layer 3 and the adhesive 4, and the backing substrate does not remain on the wall. Therefore, there is no need to remove the paper remaining on the base surface, repair the base, or adjust the base, which is required in the conventional wallpaper replacement process.
In step 205 (S205), the adhesive 4 is applied to the wallpaper.
In step 210 (S210), the wallpaper to which the adhesive 4 has been applied is attached to the base material. As described above, if the wallpaper P is used, the number of steps can be reduced even in the replacement work, and the work load on the worker can be reduced.

P (P1 to P22): Wallpaper having release layer 1: Backing substrate 2: Decorative layer 3: Release layer 4: Adhesive 5: Base substrate 6: Release film

Claims

Natural rubber latex, polyolefin-based emulsion, or a mixture of natural rubber latex and a polyolefin-based emulsion, containing a silicone resin emulsion, or a fluororesin emulsion, or a mixture of a silicone resin emulsion and a fluororesin emulsion, and a wax emulsion A coating release layer forming composition comprising:
The composition for forming a release layer for coating according to claim 1, wherein the natural rubber latex comprises an organic peroxide pre-vulcanized natural rubber latex.
The solid content of the natural rubber latex is 21 to 54 parts by mass, and the solid content of the polyolefin-based emulsion is 6 to 28 parts by mass, based on 100 parts by mass of the total components of the coating release layer forming composition. Item 3. The composition for forming a coating release layer according to Item 1 or 2.
The total solid content of the mixture of the natural rubber latex and the polyolefin-based emulsion is 9 to 45 parts by mass with respect to 100 parts by mass of the total components of the coating release layer forming composition. 3. The composition for forming a release layer for coating according to claim 1, wherein the solid content is 6 to 42 parts by mass, and the solid content of the polyolefin emulsion is 3 to 21 parts by mass.
The solid content of the silicone resin emulsion is 0.5 to 10 parts by mass, and the solid content of the fluororesin emulsion is 0.2 to 100 parts by mass of the total components of the coating release layer forming composition. The solid content of the mixture of the silicone resin emulsion and the fluororesin emulsion is 0.5 to 10 parts by mass, and the solid content of the wax emulsion is 2 to 15 parts by mass. Item 5. The composition for forming a release layer for coating according to any one of Items 1 to 4.
A wallpaper having a release layer formed on the back surface of a backing substrate, wherein the release layer is formed by the coating release layer forming composition according to any one of claims 1 to 5. A wallpaper having a release layer.
On the back side of the backing substrate, a wallpaper having a release layer,
An adhesive applied to the surface of the release layer,
Having a release film adhered to the surface to which the adhesive has been applied,
The release layer is a natural rubber latex, a polyolefin-based emulsion, or a mixture of a natural rubber latex and a polyolefin-based emulsion, a silicone resin emulsion, or a fluororesin emulsion, or a mixture of a silicone resin emulsion and a fluororesin emulsion, and a wax. A wallpaper set formed by a coating release layer forming composition containing an emulsion.
A step of applying an adhesive to the surface of the release layer, for wallpaper having a release layer on the back surface of the backing substrate,
Attaching a wallpaper coated with the adhesive to a base material,
The release layer is a natural rubber latex, a polyolefin-based emulsion, or a mixture of a natural rubber latex and a polyolefin-based emulsion, a silicone resin emulsion, or a fluororesin emulsion, or a mixture of a silicone resin emulsion and a fluororesin emulsion, and a wax. A method for applying a wallpaper formed by a coating release layer forming composition containing an emulsion.
A step of peeling off the wallpaper stuck to the base substrate at the interface between the release layer and the adhesive,
The method according to claim 8, further comprising: attaching the adhesive-applied wallpaper to the base material without performing repair and adjustment of the base material from which the wallpaper has been peeled off.