JPH05125700A - Production of flameproof paper for backing vinyl wallpaper - Google Patents

Abstract

PURPOSE:To obtain the subject flameproof paper having decreased internal bond strength and excellent peelability by coating the surface of a base paper with a surface-coating composition, applying a specific amount of water to the paper after drying and bending the paper at a specific angle directing the water-coated face outward. CONSTITUTION:The objective flameproof paper is produced e.g. by coating the surface of a base paper containing 70-90wt.% of aluminum hydroxide as an inorganic substance with preferably 2-10wt.% (in terms of solid component based on the base paper) of a surface-coating composition such as latex emulsion (preferably having a concentration of 5-20wt.%), drying the coated paper, applying 5-15g/m<2> of water to a surface of the paper and bending the paper at an angle of 60-180 deg. directing the water-coated face outward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a flame-retardant paper used for backing vinyl wallpaper, and more particularly to a method for producing a flame-retardant paper for vinyl wallpaper backing which is excellent in removability after wallpaper application.

[0002]

BACKGROUND OF THE INVENTION Flame-retardant paper is widely used as a base paper for various wallpapers, and is also frequently used as a vinyl wallpaper backing paper.

As flame-retardant paper, there are paper in which a flame-retardant substance is applied or impregnated, or cellulose pulp in which a flame-retardant organic substance or inorganic substance is wet-processed to be contained. Inorganic flame-retardant paper mixed with inorganic substances such as asbestos and aluminum hydroxide has excellent flame retardancy, but on the other hand, the surface of the flame-retardant paper is treated with vinyl chloride by the paste method or calendar method, and then printing, embossing, etc. When the vinyl wallpaper produced through the above is used for wall construction, there is a problem that the removability after wall construction is poor.

As a wallpaper having good removability, a method of coating a water-insoluble fatty acid metal salt having a melting point of 140 ° C. or higher (Japanese Patent Laid-Open No. 52-21407) and a blending ratio of polyolefin fibers of 50 to 90 are used. % To make the fibers short and add them to fuse the polyolefin fibers with each other (JP-A-55)
No. 6591), a paper for wallpaper is impregnated with a mixture of a thermosetting water-soluble resin and a fine particle filler uniformly dispersed therein,
A method of drying (Japanese Patent Laid-Open No. 55-40854) and the like are known, but there are problems that the number of steps is increased and costs are increased.

Regarding the flame-retardant paper for backing containing aluminum hydroxide in a high proportion, the flame-retardant paper for backing having good flame retardancy (Japanese Patent Application Laid-Open No. 61-6399 and Japanese Patent Application Laid-Open No. HEI-2).
No. 61200), flame-retardant paper for backing with little change in strength and size when applied to an alkaline substrate (Japanese Patent Laid-Open No. 3-89).
No. 2), a flame-retardant paper for backing with good blister resistance (Japanese Patent Laid-Open No. 221496/1990), etc., but no aluminum hydroxide mixed paper with good delamination property is disclosed.

[0006]

DISCLOSURE OF THE INVENTION The inventors of the present invention have solved the above-mentioned problems with flame-retardant paper for backing vinyl wallpaper, which is obtained by applying a surface coating composition to a base paper containing aluminum hydroxide as an inorganic substance. As a result of examining as much as possible,
In the step of making the base paper, after applying the surface coating composition and drying, after applying a specific range amount of water on one side of the web,
It was found that it is possible to improve the removability after wall surface construction by bending the web at a specific range of angle with the water-coated surface on the front side, and completed the present invention.

Therefore, an object of the present invention is to provide a method for producing a flame-retardant paper for backing vinyl wallpaper, which is excellent in removability after wall surface construction.

[0008]

The present invention relates to a method for producing a flame-retardant paper for backing vinyl wallpaper, which comprises coating a base paper containing aluminum hydroxide as an inorganic substance with a surface-coating composition. After coating and drying, apply 5 g / m ² or more and 15 g / m ² or less of water to one side of the web, and then bend the web at an angle of 60 ° or more and 180 ° or less with the water application surface facing up. A method for producing a flame-retardant paper for backing a vinyl wallpaper, which is characterized by the above.

The raw materials for the base paper are bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBK).
P), softwood bleached sulfite pulp (NBSP), hardwood bleached sulfite pulp (LBSP), thermomechanical pulp (TMP), other wood pulp, etc. can be used, and one or more of these pulps are appropriately selected and mixed. You may use it. In addition, 1 of synthetic fiber or inorganic fiber
The dimensional stability may be improved by blending one or more species into the pulp.

Aluminum hydroxide, which is an inorganic substance used in the present invention, has a self-extinguishing property because it releases crystal water by heating and undergoes endothermic decomposition. In the present invention, aluminum hydroxide having a single particle diameter or a mixture of two or more kinds of different particle diameters is used. The optimum particle size of aluminum hydroxide is 0.6 to 8 μm for a single particle size,
It is preferably 0.6 to 1.0 μm. On the other hand, when two or more kinds of aluminum hydroxide having different particle diameters are mixed and used, those having a small particle diameter are 0.6 to 8 μm, preferably 0.6 to 1.0 μm. The particles having a large particle diameter have a particle diameter of 15 to 25 μm, preferably 15 to 1
It is 7 μm. Further, when a small particle size and a large particle size are mixed for the purpose of providing three or more peaks in the particle size distribution, aluminum hydroxide having an intermediate particle size, for example, 8 to 15 μm may be used together. The mixing ratio of these aluminum hydroxides having different particle diameters is 1: 1 to 1: 5, preferably 1: 2 in terms of weight ratio for small and large particles.
Is in the range of to 1: 4. The content of aluminum hydroxide in the base paper is 60 to 90% by weight, preferably 70 to 90% by weight. When it is more than 90% by weight, the yield of aluminum hydroxide is lowered and the strength of the base paper is lowered, which is not preferable. On the other hand, if it is less than 60% by weight, it cannot be used because the flame retardancy of the base paper is poor.

The above pulp and aluminum hydroxide are mixed, a retention aid and a binder are appropriately selected, and papermaking is carried out by a usual papermaking method. As the retention aid, for example, as the cationic polymer, there are cationized starch, cationic polyacrylamide, polyethyleneimine, polyamide polyamine epichlorohydrin, cation-modified guar gum, cation-modified polyvinyl alcohol, and other cationic polymers. It is not particularly limited. Examples of the anionic polymer include polyacrylamide, polymethacrylamide, oxidized starch, and other anionic polymers, and any of them may be used. In addition to these, there are bentonite clay and the like, and one kind or two or more kinds thereof can be used. As the binder, vinylon binder, latex or the like is used.

[0012] Usually, during papermaking, an internally added sizing agent is added for papermaking. The reason for this is to prevent the surface coating composition from penetrating into the base paper when the next surface coating composition is applied. When the surface coating composition penetrates into the base paper, the peel strength of the base paper increases, and the removability deteriorates when the paper is applied after being processed. Further, since the surface coating composition does not stay on the surface, it is not possible to prevent the aluminum hydroxide from falling off, the adhesiveness with vinyl chloride is deteriorated, and the consumption of the surface coating composition is increased, leading to a high cost.

In the present invention, one or two or more different types of sizing agents are selected and added in the papermaking process. When two or more kinds are combined, it is preferable to combine a sizing agent that exhibits a sizing effect immediately after the addition and a sizing agent that exhibits an effect after a while. Thereby, after the papermaking, the size can be controlled by the sizing agent having a sizing effect immediately before the step of applying the surface coating composition on-machine, and the permeation of the surface coating composition into the base paper can be prevented. In addition, the sizing agent that shows its effect after a while can prevent the PVC paste from soaking in when processing the wallpaper backing paper after applying PVC and preventing the glue from soaking in during wallpaper construction. You can also

As the internally added sizing agent, for example, an alkyl ketene dimer or the like is selected as a sizing agent which exhibits an effect over time, and a styrene acrylic or styrene amide sizing agent is appropriately selected as a sizing agent which exhibits a size effect immediately. To use. Cobb water absorption of the base paper made is 20
g / m ² or less, preferably internally added sizing agent to be 5 to 20 g / m ^2. A Cobb water absorption degree is 5 g / m ² less than induce foaming trouble in the papermaking process manually by sizing addition of a large amount, there is a penetration of 20 g / m ² is greater than the surface coating composition is not preferable. With respect to the blending ratio of the internally added sizing agent, in the case of one kind, 0.1 to 0.4% by weight, preferably 0.2 to 0.3% by weight of a sizing agent exhibiting an effect after a while is added. It is not preferable to use only a sizing agent that exhibits a sizing effect, because a large amount must be added, resulting in high cost. In the case of two or more kinds, a sizing agent showing an effect after a while is used.
05 to 0.3% by weight, preferably 0.1 to 0.2% by weight, and 0.1 to 0.1% by weight of a sizing agent exhibiting a size effect.
Add 0.6 wt%, preferably 0.2-0.5 wt%. If it is less than these ranges, a substantial size effect cannot be obtained, and if it exceeds these ranges, troubles occur in the paper making process and the cost increases, which is not suitable.

In the present invention, the surface of the wallpaper backing paper is applied in the papermaking process. The reason is to (1) prevent aluminum hydroxide from falling off from the web and (2) improve the adhesion to vinyl chloride during the vinyl chloride processing.

The surface coating composition used in the present invention includes, for example, latex emulsion, polyacrylic emulsion,
There are starch, PVA, styrene acrylic emulsion and the like, which are appropriately selected and used by mixing with a thickener. The surface coating composition is applied to the base paper as an aqueous solution having a concentration of 5 to 20% by weight, and the application amount is 2 to 10% by weight (as solid content) per base paper. If the coating amount is less than 2% by weight, the aluminum hydroxide cannot be prevented from falling off from the web. On the other hand, the surface coating composition 1
It is not desirable to apply more than 0% by weight because it causes high cost.

In the present invention, as described above, the surface coating composition is applied to the base paper and water is applied to one side of the wallpaper backing paper that has been dried, and then the web is bent with the water application side facing up. This causes a gap in the paper layer inside the wet paper,
The internal bond strength is reduced. The method of applying water is not particularly limited as long as it can be applied uniformly, but it is performed when the raw paper is made on-machine by a plain roll, a gravure roll, or the like, and the bending is performed through the roll. FIG. 1 of the accompanying drawings illustrates a water application and bending operation in a papermaking process. A web 1 coated with a surface coating composition and dried is a backing roll 2 and a watering roll 3.
It is pulled out with a bending angle of 4 upwards. The bending angle is an angle formed by the horizontal line (chain line in the figure) and the direction in which the web is pulled out after passing the roll.

The coating amount of water is 5 g / m ² or more and 15 g / m ²
It is preferably 8 g / m ² or more and 12 g / m ² or less. If it is less than 5 g / m ² , it is less likely to make wet paper on one side, and there is no effect of causing deviation of the paper layer due to bending. Also, 1
If it exceeds 5 g / m ² , a lot of energy is required for re-drying, which is not economical. The bending angle is 60 ° or more, preferably 90
° or more. When the angle is less than 60 °, the paper layer inside the wet paper does not shift. On the other hand, bending at 180 ° or more is not necessary because the paper run becomes complicated and the effect reaches the ceiling. The bent web is dried again to obtain a flame-retardant backing paper product.

[0019]

The present invention will be described in more detail with reference to the following examples, but of course the present invention is not limited thereto. In the following,% means% by weight.

Examples 1 to 4 Pine and spruce as the main raw materials were disintegrated into NBKP,
It is beaten up to 300 ml by an ordinary method and used as an inorganic filler of aluminum hydroxide (the weight ratio of particle size 1 μm and 17 μm is 2
8:72 mixture) 70% based on the weight% of base paper,
Polyester fiber (diameter 1.4d × fiber length 5 mm, manufactured by Unitika Ltd.) was added as a synthetic fiber in an amount of 2% based on the total weight. In addition, as a retention aid, Epinox (cationic:
Dick Hercules) 0.1%, Percoll 173 (anionic: Allied Colloid) 0.0
1%, alkyl ketene dimer (A as neutral sizing agent
DK: Arakawa Chemical Co., Ltd.) was added to 0.3% to prepare a stock material, and then a vinyl paper backing base paper having a basis weight of 135 g / m ² and a density of 0.7 g / cm ^{3 was produced by} a laboratory hand-making machine. Created.

Next, SBR latex T-2418C
(Manufactured by JSR) and PC-305 (polyacrylamide:
Arakawa Chemical Co., Ltd.) and SBR latex and PC-3, respectively.
05: 82:18 in a ratio of 12.5
A% concentration surface coating composition liquid was prepared and applied to both sides of the base paper obtained above by a laboratory size press. The coating amount of these surface coating compositions was 3.6%. After drying, water was applied to one side of the paper web, and then the paper web was bent with the water application side facing up. The amount of water applied was 6 g / m ² and 14 g / m ² , and the bending angle was 60 ° and 1 respectively.
It was set to 20 °. After bending, the web was dried again and the internal bond strength (kg-cm / inch ² ) was adjusted to J. It was measured according to TAPPI 18.

Comparative Examples 1 to 3 Water coating amounts of 0 g / m ² , 3 g / m ² and 20 g / m ²
And the bending angles are 0 °, 60 ° and 45 °, respectively.
Flame retardant paper for backing was prepared in the same manner as in Examples 1 to 4 except that the above was used, and the internal bond strength was measured. Table 1 shows the measurement results of Examples and Comparative Examples.

Table 1 Water coating amount Bending angle Internal bond strength (g / m ² ) (degree) (kg-cm / in ² ) Example 1 6 60 1.05 Example 2 6 120 0.98 Example 3 14 60 1.00 Example 4 14 120 0.95 Comparative Example 1 0 0 1.15 Comparative Example 2 3 60 1.15 Comparative Example 3 20 45 1.15

[0024]

As can be seen from the above description, according to the present invention, 5 g / m ² or more and 15 g / m ² or more on one side of a paper web after the surface coating composition is applied to a base paper containing aluminum hydroxide and dried. After applying water of m ² or less, by bending the web at an angle of 60 ° or more and 180 ° or less with the water-applied surface on the front side, the paper layer shift occurs inside the paper layer in the one-sided wet paper state, and the backing is performed. The internal bonding strength of the flame-retardant paper for use can be reduced. As a result, it is possible to provide a base paper which is excellent in removability at the time of construction after wallpaper processing.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining water application and bending operations in the method of the present invention.

[Explanation of symbols]

 1 ... Paper 2 ... Backing roll 3 ... Watering roll 4 ... Bending angle

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 9/00 7365-4F C09K 3/00 107 9049-4H D21H 27/36 21/14 21/34 7199-3B D21H 5/00 H 7199-3B 1/02 C

Claims (1)

[Claims] 1. A method for producing a flame-retardant paper for backing a vinyl wallpaper, which comprises applying a surface coating composition to a base paper containing aluminum hydroxide as an inorganic substance, after applying the surface coating composition and drying the composition. A vinyl wallpaper lining, characterized in that after applying 5 g / m ² or more and 15 g / m ² or less of water to one side of the paper web, the paper web is bent at an angle of 60 ° to 180 ° with the water application surface as the front side. For manufacturing flame-retardant paper for use in manufacturing.