JPH0559699A - Production of flame-retardant paper for backing polyvinyl chloride-based wall paper - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a method for producing a flame-retardant paper for backing vinyl wallpaper, which has excellent removability after wallpaper application. [Composition] Consisting of bleached softwood kraft pulp, polyester fiber, aluminum hydroxide, neutral sizing agent and papermaking auxiliary agent, having a Cobb water absorption of 5 to 20 g / m ^{2 and} a basis weight of 135 g / m ^2.
consist of a mixture of SBR latex and polyacrylamide vinyl wallpaper backing sheet of m ^2, the surface tension is 35
A surface coating liquid of 70 dyn / cm is applied by a size press in an amount of 3.6% based on the weight of the base paper to adjust the internal bond strength.

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 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 the product is processed by printing, embossing, etc. When 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 present inventors have studied to solve these problems of flame-retardant paper for backing vinyl wallpaper, which is obtained by applying a surface coating agent to a base paper containing aluminum hydroxide as an inorganic substance. As a result, by maintaining the surface tension of the surface coating agent consisting of the adhesive and the thickener applied to the surface in the wet process within the specified range, it is possible to improve the removability after wall surface construction. Found and completed the present invention.

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

[0008]

The first aspect of the present invention is to provide a flame-retardant paper for backing vinyl wallpaper, which comprises a base paper containing aluminum hydroxide as an inorganic material and a surface coating agent applied to the surface in a wet papermaking process. The surface tension of the surface coating agent consisting of the adhesive and the thickener to be applied is 35 dyn / cm or more and 70 dy
It is a method for producing a flame-retardant paper for backing vinyl wallpaper, which is characterized in that it is n / cm or less.

A second aspect of the present invention is a method for producing a flame-retardant paper for backing vinyl wallpaper according to the first aspect of the invention, characterized in that the base paper before surface coating has a Cobb water absorption of 20 g / m ² or less. is there.

Raw material for raw paper is bleached softwood kraft pulp (NBKP), bleached kraft hardwood (LBKP), bleached softwood sulphite pulp (NBSP), bleached sulphite hardwood (LBSP) thermomechanical pulp (TMP), and others. Wood pulp, etc., and one or more kinds of these pulps may be appropriately selected and mixed and used. Further, the dimensional stability may be improved by blending one kind or two or more kinds of synthetic fibers or inorganic fibers into the pulp.

Aluminum hydroxide, which is an inorganic substance used in the present invention, has 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. Also, in the case of mixing a small particle size and a large particle size in order to provide 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 such that the weight ratio of the one having a small particle diameter and the one having a large particle diameter is 1: 1 to 1: 5, preferably 1: 2 to 1: 4. Aluminum hydroxide content is 60-90
%, Preferably 70 to 90%. When it is 90% or more, the yield of aluminum hydroxide is lowered and the strength of the base paper is lowered, which is not preferable. If it is 60% or less, 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.

The internally added sizing agent is added during the papermaking process to make the paper, because the coating agent is prevented from penetrating into the base paper at the time of applying the next surface coating agent. Soaking into the base paper increases the delamination strength of the base paper,
The removability deteriorates when the wallpaper is applied after processing. Further, since the coating agent does not stay on the surface, it is not possible to prevent the aluminum hydroxide from falling off, the adhesiveness with PVC is deteriorated, the consumption amount of the coating agent is increased, and the cost is increased. One or two or more different types of sizing agents are selected and used 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 addition and a sizing agent that exhibits an effect after a lapse of time. This allows
After the papermaking, the size can be controlled by the sizing agent which has a sizing effect immediately before the step of applying the surface coating agent on-machine, so that the penetration of the coating agent into the base paper can be prevented. In addition, a sizing agent that will show an effect after a while will prevent the PVC paste from soaking in when the PVC is applied and processed after the wallpaper backing paper is manufactured, and prevents the glue from seeping in during wallpaper construction. it can. However, in the present invention, since the penetration of the coating agent into the base paper is prevented by increasing the surface tension of the surface coating agent, only one type of sizing agent may be used.

As the internally added sizing agent, for example, an alkyl ketene dimer is selected as a sizing agent which exhibits an effect after a lapse of time, and a styrene acrylic type or a styrene amide type sizing agent is selected as a sizing agent which exhibits a size effect immediately. To use. Cobb water absorption of papermaking base paper is 20g /
m ² or less, preferably internally added sizing agent to be less than 5 to 20 g / m ^2. If the Cobb's water absorption is small, the amount of the sizing agent added is large, which causes foaming troubles in the paper making process, and if it is larger than 20 g / m ² , the surface coating composition is soaked, which is not preferable. The blending ratio of the internally added sizing agent is 0.1 to 0.4%, and preferably 0.2 to 0.3% for the sizing agent which shows the effect after a long time in the case of one kind.
Added. It is not preferable to use only a sizing agent that exhibits a sizing effect immediately, because a large amount must be added, resulting in high cost. In the case of two or more kinds, the sizing agent that exerts an effect after a lapse of time is 0.05 to 0.3%, preferably 0.1 to 0.2%, and the sizing agent that immediately exhibits the sizing effect is 0.1 to 0.3%. 0.6%, preferably 0.2-
Add 0.5%. If it is less than these ranges, a substantial size effect cannot be obtained, and if it exceeds these ranges, problems occur in the papermaking process and the cost becomes high, which is not suitable.

In the papermaking process, the surface of the wallpaper-lined paper is applied, because (1) the aluminum hydroxide is prevented from falling off from the web, and (2) the adhesion with vinyl chloride is applied during the vinyl chloride processing. This is to improve the sex.

The surface coating composition used in the present invention includes, for example, latex emulsion, polyacrylic emulsion,
There are starch, PVA, styrene acrylic emulsion, etc., which are appropriately selected and used by mixing with a thickener. This surface coating composition is applied to the base paper as an aqueous solution having a concentration of 5 to 20%, and the amount is 2 to 10% by weight based on the base paper.
(As solids). When the coating amount is 2% by weight or less, the aluminum hydroxide cannot be prevented from falling off from the web. On the other hand, it is not desirable to apply the surface coating agent in an amount of 10% by weight or more because the cost is increased.

When the surface coating composition soaks into the base paper,
The delamination strength of the base paper is increased, and the removability is deteriorated when it is applied after being processed into wallpaper. Further, since the coating agent does not stay on the surface, it is impossible to prevent the aluminum hydroxide from falling off, and the adhesiveness with vinyl chloride is deteriorated. Therefore, a surface coating composition having a higher surface tension is used.

The surface tension of the coating liquid for the present invention is 35.
dyn / cm or more and 70 dyn / cm or less, preferably 4
The range is 0 dyn / cm or more and 65 dyn / cm or less. If the surface tension of the surface coating composition is less than 35 dyn / cm, the penetration into the web becomes large and the delamination strength of the base paper increases, which is not preferable. When it exceeds 70 dyn / cm, problems such as cissing of the coating solution tend to occur in coating suitability.

The method for applying the surface coating composition of the present invention is not particularly limited as long as it can be applied uniformly, but it is performed when the base paper is made on-machine by a gate roll coater, size press or the like.

[0020]

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 6 After disintegrating NBKP containing pine and spruce as main raw materials,
It is beaten up to 300 ml by a conventional method, and the weight ratio of aluminum hydroxide as an inorganic filler is 1 μm and 13 μm is 2
8:72, 70% based on the weight of the base paper, and polyester fiber (diameter 1.4d × fiber length 5m)
m, manufactured by Unitika Ltd.) was added in an amount of 2% based on the total weight. In addition, 0.1% of Epinox (cationic type: manufactured by Dick Hercules) as a retention aid, Percoll 173
(Anion type: manufactured by Allied Colloid Co.) 0.01%,
Alkyl ketene dimer (AKD:
0.25% and 0.35% of Arakawa Chemical Co., Ltd. was added to prepare a paper material, and then the basis weight was 135 g / m ² and the density was 0.7 g / m.
^Three vinyl wallpaper linings were made with a laboratory handmade machine. The Cobb's water absorbency of this base paper is measured according to JIS P-8140.
It was measured according to.

On this base paper, a surface tension of 35 dyn / cm,
SBR latex of 45 dyn / cm and 65 dyn / cm (manufactured by JSR) and PC-305 (polyacrylamide: manufactured by Arakawa Chemical Co., Ltd.) are used as SBR latex and PC-, respectively.
Mix 305 to 82:18 ratio, 12.
A coating solution having a concentration of 5% was prepared and applied on both sides by a size press. The surface tension of these surface coating compositions is 38.
7 dyn / cm, 45.2 dyn / cm, 67.4 dy
The coating amount was 3.6% by weight at n / cm. The internal bond strength of this flame-retardant paper for backing was determined by J. It was measured according to TAPPI 18.

Examples 7-24 Neutral sizing agents alkyl ketene dimer and SW30
(Styrene acrylic type: manufactured by Dick Hercules)
To 0.1 / 0.2% and 0.1 / 0.4 respectively
%, 0.1 / 0.6%, 0.2 / 0.2%, 0.2 /
A base paper was prepared in the same manner as in Examples 1 to 6 except that 0.4% and 0.2 / 0.6% were added to prepare the stock, and the coating solution was applied on both sides by a size press. The coating amount was 3.6% by weight. The Cobb water absorption of the base paper and the internal bond strength of the flame-retardant backing paper were measured.

Examples 25 to 27 Base papers were prepared in the same manner as in Examples 1 to 6 except that the neutral sizing agent was changed to SW30 and 0.6% was added to prepare the stock.
The coating solution was applied on both sides by a size press. The coating amount was 3.6% by weight. The Cobb water absorption of the base paper and the internal bond strength of the flame-retardant backing paper were measured.

Comparative Examples 1 to 3 The neutral sizing agent was changed to an alkyl ketene dimer to give 0.1
SBR latex (T-2418C, manufactured by JSR Corporation: surface tension 29d) was prepared in the same manner as in Examples 1 to 6 except that 5%, 0.25% and 0.35% were added to prepare the stock.
yn / cm) and polyacrylamide (PC-305) were mixed at a ratio of 82:18 to prepare a coating solution having a concentration of 12.5%, and both surfaces were coated with a size press in the same manner as in Examples 1 to 6. The surface tension of this surface coating composition is 33.0 dyn.
/ Cm, and the coating amount was 3.6% by weight. The Cobb water absorption of the base paper and the internal bond strength of the flame-retardant backing paper were measured.

Comparative Examples 4 to 6 The neutral sizing agent was changed to SW30, and 0.2%, 0.4%,
Base papers were prepared in the same manner as in Examples 1 to 6 except that 0.6% was added to prepare the paper stock, and the coating solutions shown in Comparative Examples 1 to 3 were applied on both sides by a size press. The coating amount was 3.6% by weight. The Cobb water absorption of the base paper and the internal bond strength of the flame-retardant backing paper were measured.

Comparative Examples 7 to 9 The neutral sizing agent was changed to an alkyl ketene dimer to give 0.1
A base paper was prepared in the same manner as in Examples 1 to 6 except that 5% was added to prepare a stock, and the coating solution was applied on both sides with a size press. The coating amount was 3.6% by weight. The Cobb water absorption of the base paper and the internal bond strength of the flame-retardant backing paper were measured.

Comparative Examples 10 to 15 Base papers were prepared and applied in the same manner as in Examples 1 to 6 except that the neutral sizing agent was changed to SW30 and 0.2% 0.4% was added to prepare the stock. The solution was applied on both sides by a size press. The coating amount was 3.6% by weight. The Cobb water absorption of the base paper and the internal bond strength of the flame-retardant paper for backing were measured.

Tables 1 and 2 show the measurement results of Examples and Comparative Examples.
Shown in.

[0030]

[Table 1]

[0031]

[Table 2]

[0032]

The surface tension is 35 dyn / cm or more and 70 d.
A surface coating composition of yn / cm or less and a Cobb water absorption of 2
By producing a flame-retardant paper for backing using a base paper of 0 g / m ² or less, it is possible to prevent the surface coating composition from penetrating during on-machine coating and reduce the internal bond strength of the flame-retardant paper for backing. As a result, it is possible to produce a base paper having excellent removability during construction after wallpaper processing.

[Procedure amendment]

[Submission date] November 5, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

DISCLOSURE OF THE INVENTION The present inventors have studied to solve these problems of flame-retardant paper for backing vinyl wallpaper, which is obtained by applying a surface coating agent to a base paper containing aluminum hydroxide as an inorganic substance. As a result, it is possible to improve the removability after wall construction by maintaining the surface tension of the surface coating agent consisting of the adhesive and the thickener applied to the surface in the wet papermaking process within the specified range. They found out and completed the present invention.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

The first aspect of the present invention is to provide a method for producing a flame-retardant paper for backing vinyl wallpaper, which comprises applying a surface coating agent to a base paper containing aluminum hydroxide as an inorganic substance. In addition, the production of a flame-retardant paper for backing vinyl wallpaper, characterized in that the surface tension of the surface coating agent composed of an adhesive and a thickener applied to the surface in the wet papermaking process is set to 35 dyn / cm or more and 70 dyn / cm or less. Is the way.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The internally added sizing agent is added during the papermaking process to make the paper, because the coating agent is prevented from penetrating into the base paper at the time of applying the next surface coating agent. Soaking into the base paper increases the delamination strength of the base paper,
The removability deteriorates when the wallpaper is applied after processing. Further, since the coating agent 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, the consumption of the coating agent is increased, and the cost is increased. One or two or more different types of sizing agents are selected and used 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 addition and a sizing agent that exhibits an effect after a lapse of time. This allows
After the papermaking process, the size can be controlled by the sizing agent which has a sizing effect immediately before the step of applying the surface coating agent on-machine, and the penetration of the coating agent into the base paper can be prevented. In addition, a sizing agent that will show an effect after a while can prevent the PVC paste from seeping in when processing the wallpaper-backed paper after applying PVC and processing it, and can also prevent the glue from seeping in during wallpaper construction. .. However, in the present invention, since the surface tension of the surface coating agent is increased to prevent the coating agent from penetrating into the base paper, only one type of sizing agent may be used.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Examples 1 to 6 After disintegrating NBKP containing pine and spruce as main raw materials,
It is beaten up to 300 ml by a conventional method, and the weight ratio of aluminum hydroxide as an inorganic filler is 1 μm and 13 μm is 2
8:72, 70% based on the weight of the base paper, and polyester fiber (diameter 1.4d × fiber length 5m)
m, manufactured by Unitika Ltd.) was added in an amount of 2% based on the total weight. In addition, 0.1% of Epinox (cationic type: manufactured by Dick Hercules) as a retention aid, Percoll 173
(Anion type: manufactured by Allied Colloid Co.) 0.01%,
Alkyl ketene dimer (AKD:
0.25% and 0.35% of Arakawa Chemical Co., Ltd. was added to prepare a paper material, and then the basis weight was 135 g / m ² and the density was 0.7 g / c.
vinyl wallpaper backing paper of m ³ was created in the laboratory hand paper making machine. The Cobb's water absorption of this base paper is measured according to JIS P-814.
It measured according to 0.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

[0032]

The surface tension is 35 dyn / cm or more and 70 d.
A surface coating composition of yn / cm or less and a Cobb water absorption of 2
By producing a flame-retardant paper for backing using a base paper of 0 g / m ² or less, it is possible to prevent the surface coating composition from penetrating during on-machine coating and reduce the internal bond strength of the flame-retardant paper for backing. As a result, there is an effect that it is possible to manufacture a base paper which is excellent in removability after being applied to the wall surface .

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location 7199-3B D21H 3/78 (72) Inventor Yoshiaki Kabayama 1-10-6 Shinonome, Koto-ku, Tokyo No. Oji Paper Co., Ltd. Product Research Laboratory

Claims (2)

[Claims] 1. A flame-retardant paper for backing a vinyl wallpaper, comprising a base paper containing aluminum hydroxide as an inorganic material and a surface coating agent. A surface comprising an adhesive and a thickener applied to the surface in a wet papermaking process. The surface tension of the coating agent is 35 dy
A method for producing a flame-retardant paper for backing vinyl wallpaper, characterized in that it is not less than n / cm and not more than 70 dyn / cm. 2. The Cobb water absorption of the base paper before surface coating is 20 g.
/ M ² or less, the method for producing a flame-retardant paper for vinyl wallpaper backing according to claim 1.