JPH108400A - Inorganic sheet and inorganic wall paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inorganic paper which is chlorine-free without liberation of hydrogen chloride on incineration of its waste and shows excellent adhesion to the decorative layer and provide an inorganic wall paper having the decorative layer of a polyolefin resin. SOLUTION: In an inorganic sheet which is used as a lining for vinyl chloride free wall paper having a decorative layer of 21 polyolefin resin, the inorganic sheet is coated with a surface-coating agent of a styrene-butadiene resin emulsion containing 9-17wt.%, on the solid basis, of a polyolefin resin emulsion and is adhered to the decorative polyolefin layer al a temperature lower than 110 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an inorganic sheet and an inorganic wallpaper. More specifically, it is an inorganic sheet or an inorganic wallpaper used as a backing paper of a non-vinyl chloride wallpaper whose decorative layer is made of polyolefin.

[Prior art]

[0002] In recent years, with the upsizing and diversification of living spaces, vinyl wallpaper has been widely used as an interior decoration material. In particular, vinyl wallpaper is inexpensive and can be subjected to various processes such as printing, foaming, embossing, etc., and is therefore excellent in design, abundance of colors and patterns, and the like. Vinyl wallpaper is generally manufactured by applying a vinyl chloride paste to a backing paper, followed by printing, foaming, and embossing. As the backing paper, a flame-retardant paper impregnated with a flame retardant or a wet paper-making method of a flame-retardant inorganic powder, and an inorganic paper base containing not less than 80% by weight of an inorganic substance in which inorganic fibers and inorganic powder are added together are contained. An inorganic paper obtained by applying a surface coating agent having an affinity for a vinyl chloride paste to paper is generally used.

[0003] Generally, wallpaper is replaced in three to five years. However, the stripped wallpaper is landfilled because it is difficult to incinerate it as waste. The reason why incineration is not possible is that chlorine contained in the vinyl wallpaper is generated as hydrogen chloride. The generated hydrogen chloride shortens the life of the incinerator, and furthermore, the hydrogen chloride contained in the exhaust gas is radiated into the atmosphere, and thus has problems such as being environmentally unfavorable.

[0004] In response to such environmental and safety problems of vinyl wallpaper, non-vinyl chloride wallpaper has recently been developed. For example, Japanese Unexamined Patent Publication No. Hei 6-33399 discloses a method in which a decorative layer of acrylic resin is provided instead of the conventional decorative layer of vinyl chloride wallpaper. However,
In this method, it is necessary to use a multi-layer structure and to perform complicated steps, which increases the manufacturing cost. Further, Japanese Patent Laid-Open No.
No. 948 also discloses a non-vinyl chloride wallpaper in which a polyolefin film and flame-retardant paper are bonded. However, in this method, a porous flame-retardant paper is used as a backing paper, and a non-porous inorganic paper having a surface coating layer as a backing paper has not yet been disclosed. The reason is that, in addition to the purpose of preventing inorganic powder from falling off, conventional inorganic papers also provide adhesion to the vinyl chloride paste decorative layer. This is because these main binders have different solubility parameters from polyolefin resins and are inferior in adhesiveness.

[Problems to be solved by the invention]

[0005] Therefore, the present invention uses a non-chlorine-based substance, does not generate hydrogen chloride even when incinerated wallpaper wasted by replacement, and has excellent adhesion between the decorative layer and the inorganic sheet. An object of the present invention is to provide an inorganic wallpaper having a polyolefin decorative layer.

[Means for Solving the Problems]

In other words, the present invention relates to an inorganic sheet used as a backing paper for non-vinyl chloride wallpaper provided with a decorative layer of a polyolefin resin, wherein the surface of the inorganic sheet has a melting point of 100.
An inorganic sheet provided with a surface coating layer of a styrene-butadiene resin emulsion containing a polyolefin resin emulsion having a solid content of 9 to 17% by weight or less as a solid content,
An inorganic sheet provided with thermal adhesion to a decorative polyolefin layer at a temperature of 110 ° C. or lower. Furthermore, the present invention is an inorganic wallpaper in which the above-described inorganic sheet is provided with a polyolefin decorative layer.

BEST MODE FOR CARRYING OUT THE INVENTION

The organic fibers constituting the inorganic sheet for backing the inorganic wallpaper of the polyolefin decorative layer used in the present invention may be softwood kraft pulp (NBKP), hardwood kraft pulp (LBKP) or other wood pulp alone or in combination of two or more. And linter pulp and the like. Further, synthetic fibers such as polyethylene and polyester can be mentioned, and these may be appropriately selected and used as needed. From the viewpoint of production cost, it is preferable to use a softwood kraft pulp as a main component, and to use a small amount of synthetic fiber as needed. Glass fibers are examples of inorganic fibers. The inorganic powder is not particularly limited as long as it is a filler imparting flame retardancy commonly used as a papermaking raw material, such as aluminum hydroxide and magnesium hydroxide.

Examples of the wet end additive used for making the inorganic sheet according to the present invention include a paper strength enhancer composed of a cationic polymer, a retention aid composed of an anionic polymer, and a bentonite clay. A retention agent composed of an inorganic compound, a sizing agent, a binder such as fibrous hot-melt vinylon, and other papermaking chemicals are appropriately selected and used. Examples of the cationic polymer compound include, but are not particularly limited to, cationized starch, cationic polyacrylamide, polyethyleneimine, cationic guar gum, and cationic polyvinyl alcohol. Examples of the anionic polymer compound include polyacrylamide, polymethacrylamide, and oxidized starch, and any of them may be used.

The raw material slurry comprising the fiber raw material and filler thus obtained is added with internal additives such as a paper-strength enhancer and a sizing agent, and if necessary, a fixing aid, and then an emulsion of the polymer compound is added. And papermaking is carried out by a conventional method. At this time, the inorganic content was 8 to the weight of the inorganic sheet.
0% by weight or more. Papermaking can be carried out by a usual papermaking method such as a fourdrinier paper machine, a round net paper machine, a fourdrinier-circle net combination paper machine, or a short net paper machine, but is not particularly limited.

The inorganic sheet base paper thus obtained is further coated with a surface coating agent. At this time, in order to prevent the coating agent from excessively penetrating into the inorganic sheet,
It is desirable to add an internal sizing agent such as an alkyl ketene dimer, a styrene acrylic emulsion, or a styrene amide emulsion as the sizing agent as a wet end additive to form a paper. If the surface coating agent soaks into the inorganic sheet excessively, the delamination strength of the inorganic sheet increases, and thus the peelability of the wallpaper deteriorates when processed into a wallpaper and applied. Further, since the coating agent does not remain on the surface of the inorganic sheet, the degree of contributing to the improvement of the surface strength is reduced, the effect of preventing the inorganic powder in the inorganic sheet from falling off is reduced, and the polyolefin decorative layer and the backing inorganic sheet are reduced. Adhesion with the surface also deteriorates. In addition, the amount of the surface coating agent applied increases, leading to an increase in cost.

The surface coating agent used in the present invention has a melting point of 1.
A styrene-butadiene-based binder containing 9 to 17% by weight of a polyolefin resin emulsion having a solid content of 00 ° C. or lower, and a water retention agent can be used in combination. The water retention agent is for imparting coatability, and uses polyethylene oxide, polyacrylamide, polyvinyl alcohol, or the like. The method of applying the surface coating agent may be any method such as a commonly used on-machine type size press, gate roll coating method, or off-machine coating method, and is not particularly limited as long as it can be uniformly applied to the base paper surface of the inorganic sheet. The coating amount at this time is preferably ² to 5 g / m ² per solid weight on the decorative layer side application surface of the inorganic sheet. If it is less than ² g / m ² , the adhesion to the polyolefin decorative layer described later will be poor, and if it is more than 5 g / m ² , the flame resistance will decrease and the cost will increase, which is not suitable.

Next, the composition of the polyolefin decorative layer will be described. The composition of the polyolefin decorative layer is not particularly limited, but the following composition is desirable. The decorative polyolefin layer is preferably composed of a polyolefin copolymer, a foaming agent, and an inorganic filler. The polyolefin copolymer includes low-density polyethylene, high-density polyethylene, polypropylene and the like. A foaming agent (hereinafter referred to as a heat-expandable microcapsule) is a heat-expandable microcapsule containing a vaporizable liquid, and particularly, 180 to 200 ° C.
It is preferable to use a shell composed of a shell having a softening point of, and a foam having a property of foaming several to several tens times by heating. The inorganic filler is preferably magnesium hydroxide,
Aluminum hydroxide is not preferred because the decomposition temperature is low. The decorative layer composed of each of the above-described compositions was used as a heat-expandable microcapsule 5 per 100 parts by weight of the olefin copolymer.
To 30 parts by weight and 10 to 50 parts by weight of magnesium hydroxide. If the amount of the heat-expandable microcapsules is less than 5 parts by weight, the desired texture cannot be obtained, and if it is more than 30 parts by weight, the surface strength of the product is inferior. When the amount of the inorganic filler is less than 10 parts by weight, the flame retardancy is poor,
If the amount is more than 50 parts by weight, the film strength is inferior. The magnesium hydroxide may be surface-treated with a higher fatty acid, a higher alcohol, or the like in order to increase the affinity with the polyolefin copolymer. The above-mentioned composition is formed into a film shape, and bonded to the above-mentioned inorganic sheet to produce a polyolefin decorative layer inorganic wallpaper. The film thickness at this time is 100 to 200 μm.

In order to form and bond the composition as described above into a film, a calendering method, a T-die extrusion method and the like can be used, but there is no particular limitation. Further, as a method of separately forming a polyolefin film and bonding it to an inorganic sheet to obtain a polyolefin decorative layer inorganic wallpaper, a bonding method such as a dry lamination method, a hot melt lamination method, or an extrusion lamination method is also possible.

The polyolefin decorative layer inorganic wallpaper raw material thus obtained is heated and foamed in a drying furnace heated to, for example, 225 ° C. for 60 seconds to form a film having a thickness of 400 to 500 μm.
m of polyolefin decorative layer inorganic wallpaper. In addition, it is also possible to give the appearance beauty by embossing the polyolefin decorative layer inorganic wallpaper thus obtained.

[0015]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In the following, “%” and “part” indicate “% by weight” and “part by weight”, respectively.

[0016]

[Example 1] After disintegrating NBKP, 300 ml by a conventional method
Beat to csf, average particle size 8μm as inorganic powder
Aluminum hydroxide (Heidilite H-32: manufactured by Showa Denko) was added at 80% by weight per base paper weight, and polyester fiber (1.4 d × fiber length: 5 mm, manufactured by Unitika) was added as a synthetic fiber at 2% by weight based on the total weight. did. Epinox (Nippon PM) was added to this mixture as a cationic retention aid.
C), 0.1% by weight of Percoll 173 (made by Allied Colloid) as an anionic retention aid, and 0.3% by weight of alkyl ketene dimer (manufactured by Arakawa Chemical) as a neutral sizing agent. Then, a stock was prepared. From this stock, an inorganic sheet base paper of 114 g / m ² was prepared.

Then, styrene-butadiene rubber latex (T-2418C: manufactured by Nippon Synthetic Rubber) and polyacrylamide (Santax S) were applied to the obtained inorganic sheet base paper.
P67: Mitsui Toatsu Chemicals, Inc.) was mixed at a solid content weight ratio of 9: 1 to prepare a base color. Further, a polyolefin-based resin emulsion having a melting point of 80 ° C. (Sixen A: manufactured by Sumitomo Seika) was added to the base color so as to be 15% of the solid content of the color to prepare a surface coating agent. The surface coating agent was applied to the decorative layer side of the inorganic sheet base paper at 3 g / m ² per solid weight, and the opposite surface was coated with the base color at 3 g / m ^2. It was dried in a dryer.

Next, 10 parts of heat-expandable microcapsules (Microsphere F-80: manufactured by Matsumoto Yushi Seiyaku) and 20 parts of magnesium hydroxide (Kisuma 5B: manufactured by Kyowa Chemical) are mixed with 100 parts of the low-density polyethylene resin. The resulting hot-melt resin composition was formed into a 150-μm film by a calender method to form a decorative polyolefin layer, which was bonded to an inorganic sheet heated to 105 ° C.

The thus obtained polyolefin decorative layer inorganic wallpaper raw material was dried in a drying oven set at 225 ° C. for 6 hours.
Foaming was performed by heating for 0 second to prepare a 500 μm thick polyolefin decorative layer inorganic wallpaper.

At this time, the adhesion between the polyolefin film and the inorganic sheet was evaluated by peeling the decorative layer from the interface of the inorganic sheet and causing poor adhesion if the interface was peeled off, and good adhesion if peeling off the inorganic sheet layer ( ○).

[0021]

Example 2 Inorganic wallpaper of polyolefin decorative layer in the same manner as in Example 1 except that the polyolefin resin emulsion added to the surface coating agent of the inorganic sheet base paper was added so as to be 11% based on the solid content of the base color. Was manufactured and the adhesiveness of the decorative layer was measured.

[0022]

Comparative Examples 1-2 The polyolefin resin emulsion added to the surface coating agent of the inorganic sheet base paper was adjusted to 18% (Comparative Example 1) and 7% (Comparative Example 2) with respect to the solid content of the base color. Except for the above, a polyolefin decorative layer inorganic wallpaper was produced in the same manner as in Example 1, and the adhesiveness of the decorative layer was measured.

[0023]

Comparative Example 3 Inorganic wallpaper of a polyolefin decorative layer in the same manner as in Example 1 except that the polyolefin resin emulsion added to the surface coating agent of the inorganic sheet base paper was changed to a product having a melting point of 110 ° C. (Chemipearl W300: manufactured by Mitsui Petrochemical). Was manufactured, and the adhesiveness of the decorative layer was measured.

[0024]

Comparative Example 4 The base color main binder of the surface coating agent of the inorganic sheet base paper was an acrylic emulsion (AE604:
An inorganic wallpaper of a polyolefin decorative layer was produced in the same manner as in Example 1 except that it was made of Nippon Synthetic Rubber), and the adhesiveness of the decorative layer was measured.

Table 1 shows the measurement results of the examples and the comparative examples.

[0026]

[Table 1]

[0027]

[Evaluation] As is clear from Table 1, when a surface coating agent containing 9 to 17% of a polyolefin resin emulsion having a melting point of 80 ° C. was applied to the inorganic sheet as a coating agent for the inorganic sheet decorative layer, the inorganic sheet and the polyolefin decorative layer were coated. Excellent adhesiveness can be imparted between them (Examples 1 and 2). However, when the content is more than 17% by weight, the coating film becomes sticky and stains the drum type dryer (Comparative Example 1). When the amount is less than 9% by weight, the adhesiveness is not obtained (Comparative Example 2). In the case of a polyolefin resin emulsion having a melting point of 110 ° C., 10
No adhesiveness is obtained even when blended in an amount of not less than weight% (Comparative Example 3). Furthermore, when the main binder of the base color is an acrylic emulsion, the same adhesiveness is not obtained (Comparative Example 4).

[0028]

As described above, according to the present invention,
Since the coating surface on the inorganic sheet decorative layer side is coated with a surface coating agent having adhesiveness to the polyolefin decorative layer, excellent adhesiveness can be imparted between the inorganic sheet and the polyolefin decorative layer. Further, since the decorative layer is a polyolefin layer, an environmentally friendly polyolefin decorative layer inorganic wallpaper free of hydrogen chloride is obtained.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takuya Nomura 1-10-6 Shinonome, Koto-ku, Tokyo Shin-Oji Paper Co., Ltd. Shinonome Research Center

Claims (2)

[Claims] 1. An inorganic sheet used as a backing paper of non-vinyl chloride wallpaper provided with a decorative layer of a polyolefin resin, wherein the surface of the inorganic sheet contains 9 to 17% by weight of a polyolefin resin emulsion having a melting point of 100 ° C. or less as a solid content. An inorganic sheet provided with a surface coating layer of a styrene-butadiene resin emulsion, wherein the inorganic sheet is provided with thermal adhesiveness to a polyolefin decorative layer at a temperature of 110 ° C or lower. 2. An inorganic wallpaper wherein the decorative sheet of a polyolefin resin is provided on the inorganic sheet according to claim 1.