JPH0978496A - Flame retardant paper for lining vinyl wall paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a frame-retardant paper for lining vinyl wall paper, having a basis weight which is a prescribed value or below, hardly forming pinhole and having good form by applying a flame retardant to a sheet containing prescribed amounts of retardant to a sheet containing prescribed amounts of a fiber and inorganic powder. SOLUTION: This frame retardant paper for lining vinyl wall paper having <=100g/m<2> basis weight is obtained by applying a flame retardant such as a sulfamic acid guanidine-based frame retardant to a sheet obtained by mixing fiber with an inorganic powder such as kaolin and making the mixture into paper so as to impart flame retardancy to the paper. In the frame retardant paper, the sheet contains 20-45wt.% inorganic powder based on total weight of flame retardant paper and 2-10wt.% fine fibrous cellulose based on total weight of flame retardant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant paper used for lining vinyl wallpaper, and particularly, to increase the amount of expensive inorganic flame-retardant required to impart flame-retardant property by increasing the amount of inorganic powder carried. The present invention relates to a flame-retardant paper for backing vinyl wallpaper, which can be reduced in cost and reduced in cost.

[0002]

BACKGROUND ART Flame-retardant paper is widely used as a wall covering material and the like, and is also used as a base material for backing vinyl wallpaper.

Known flame-retardant papers are papers coated or impregnated with a flame-retardant agent, or cellulose pulps containing a flame-retardant organic substance or inorganic powder by a wet papermaking method. Typical examples include a flame-retardant paper obtained by impregnating paper with guanidine sulfamate as a flame retardant, and an inorganic sheet obtained by mixing aluminum hydroxide with pulp as an inorganic powder into paper.

The inorganic sheet used as a base material for wallpaper lining generally has a rice basis weight of 120 to 130 g / m ^2.
On the other hand, the flame-retardant paper impregnated with the flame-retardant agent is mainly 70 to 80 g / m ² and has a low basis weight of rice. Therefore, in the case of flame-retardant paper, it is necessary to develop strength under a low basis weight of rice, which naturally limits the content ratio of the inorganic powder.

The flame-retardant paper beats the pulp in order to obtain mechanical strength, but in order to increase the tear strength, which is one of the mechanical strengths, it is necessary to set the beating freeness of the pulp high. In order to increase the tensile strength, which is one of the mechanical strengths, it is necessary to set the beating freeness of the pulp low.

When a slurry having a high drainage property is used, the water drainage property on the wire is improved, but problems such as deterioration of the texture due to rapid dehydration and pinholes on the paper due to dropping of the filler may occur. Induce. On the other hand, a slurry with low drainage
When the above is used, the water-holding property on the wire is improved, but it causes a decrease in the papermaking speed or a trouble of breaking the web in the pressing step. Therefore, the beating freeness of pulp is set in consideration of the balance between the physical properties required for flame-retardant paper and the capability of the paper machine. Generally the freeness is 500-550 ml
It is often set to the (c.s.f., the same applies hereinafter), but it is not disclosed in JP-A-2-61200 and JP-A-2-2214.
As described in Japanese Patent Laid-Open No. 96-281099 and Japanese Patent Laid-Open No. 281099/1992, most of the lower limit is set to 500 ml.

For these reasons, in conventional flame-retardant paper, the beating of pulp is advanced to set the beating freeness to be low and to develop the tensile strength, but the blending ratio of the inorganic powder is 10 in order to secure the tear strength. The amount of the flame retardant is kept to about 21% by weight and the expensive organic flame retardant is impregnated into the remaining organic matter.

[0008]

As described above, the conventional flame-retardant paper generally has a mixing ratio of the inorganic powder of 10% by weight.
Since the residual organic substances are impregnated with an expensive flame retardant, the cost is increased.

In order to avoid such cost increase,
The issue is how to reduce the organic matter in the sheet. In order to solve this problem, naturally, the amount of the inorganic powder in the sheet may be increased. However, if the amount of the inorganic powder is increased, the paper strength is lowered, the formation is poor due to rapid dehydration, and the filler is removed. It causes an increase in pinholes in the web due to falling off.

Therefore, an object of the present invention is to provide a flame-retardant paper for backing vinyl wallpaper, which is provided with flame retardancy by coating or impregnating a sheet made of fibers and inorganic powder with a flame-retardant agent. The amount of expensive flame retardant required for flame retarding is reduced, the cost of vinyl wallpaper backing paper is reduced, and the reduction of paper strength and formation failure are improved, and pinholes are generated in the web. Is to reduce.

[0011]

DISCLOSURE OF THE INVENTION The present inventors have proposed a flame-retardant paper for backing vinyl wallpaper, which is obtained by applying or impregnating a flame-retardant agent to a sheet made by mixing paper with fibers and inorganic powder,
As a result of earnest research to reduce the amount of expensive flame retardant required for flame retardation, it is natural that reducing the organic content in the sheet is effective in reducing the amount of flame retardant, but of course, reducing the organic content. It was found that the combined use of fine fibrous cellulose was effective for preventing the deterioration of papermaking property and paper quality due to the above.

That is, the flame-retardant paper for vinyl wallpaper backing according to the present invention has a flame-retardant property obtained by applying or impregnating a sheet made of a mixed paper of fibers and inorganic powder with a flame retardant of 100 g / gram. A flame-retardant paper for backing vinyl wallpaper having a size of m ² or less, wherein the sheet comprises (1) 20% by weight or more and less than 45% by weight of inorganic powder based on the total weight of the flame-retardant paper, and (2) fine fibrous cellulose. Is contained in an amount of 2% by weight or more and less than 10% by weight based on the total weight of the flame-retardant paper.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a fine fibrous cellulose is used as a measure for improving papermaking properties and paper quality. The fine fibrous cellulose referred to in the present invention is a cellulose obtained by crushing pulp with a commonly used crusher such as a sand grinder to increase the specific surface area, and for 30 minutes under a centrifugal force of 300 G. 1. Even if dehydrated
It refers to a cellulose having a water retention capacity of 8 times or more.

The fine fibrous cellulose is rich in water retention,
Since it has the effect of lowering drainage, it has been confirmed that the beating of the pulp is not progressed so much, that is, the function of preventing deterioration of the formation and dropping of the filler when the paper is made from a material having a high beating freeness. Therefore, it was possible to improve the blending ratio of the inorganic powder by using the fine fibrous cellulose together. Japanese Patent Application Laid-Open No. 60-171262 discloses an example of an inorganic sheet containing fine fibrous cellulose, which is composed of inorganic fine particles and fine fibrous cellulose.
It is a sheet obtained by casting an aqueous slurry composed of water on a flat substrate and drying it. Inorganic powder, general pulp fibers, and fine fibrous cellulose are prepared by a wet papermaking method. This is clearly different from the flame-retardant paper for backing vinyl wallpaper of the present invention, which is mixed papermaking. Japanese Patent Laid-Open No. 63-203894 discloses an example in which a filler made of an inorganic powder, general pulp fibers and fine fibrous cellulose are mixed and produced by a wet papermaking method. It was designed to achieve both the improvement and the contradictory physical properties of paper strength.By adding a large amount of inorganic powder, the amount of flame retardant compounded to give flame retardancy was reduced, and a large amount of inorganic powder was added. It is different from the flame-retardant paper of the present invention designed to improve the pinhole and formation caused by the above.

Generally, when the amount of the inorganic powder carried is increased, the paper strength is lowered. According to the present invention, the decrease in the tensile strength of the paper strength can be dealt with by paying attention to the function of the fine fibrous cellulose as an adhesive and using it in combination. On the other hand, the tear strength may be determined by the beating degree of the pulp.

[0016] As the raw material for the raw paper, softwood bleached kraft pulp (NBKP), softwood semi-bleached kraft pulp (NBKP)
SBKP), hardwood bleached kraft pulp (LBKP), hardwood semi-bleached kraft pulp (LSBKP), softwood bleached sulfite pulp (NBSP), hardwood bleached sulfite pulp (LBSP), mechanical pulp (MP), sa-momechanical pulp (SBMPP) TMP) and other wood pulps, and one or more types of these pulps can be appropriately selected and used. Further, dimensional stability may be improved by blending one or more kinds of synthetic fibers such as polyester fibers and inorganic fibers such as glass fibers into the above fiber raw material.

In the present invention, the blending ratio of the inorganic powder in the total weight of the flame-retardant paper is 20% by weight or more and less than 45% by weight. It is preferably 25% by weight or more and 35% by weight or less.
When the content of the inorganic powder is less than 20% by weight, the cost reduction effect is low, and when the content of the inorganic powder is more than 45% by weight, the content of the fiber is reduced, so that the required paper strength is obtained. Therefore, for example, it is necessary to take measures such as making high-priced items.

The inorganic powder used is usually aluminum hydroxide, magnesium hydroxide, calcium carbonate, talc, clay, titanium oxide, activated clay, synthetic silicate, kaolin, barium sulfate, calcium sulfate, etc. Not limited.

Further, the fine fibrous cellulose to be blended in the present invention is 2% by weight or more and less than 10% by weight based on the total weight of the flame retardant paper. It is preferably 3% by weight or more and less than 10% by weight. If the blending amount of the fine fibrous cellulose is less than 2% by weight, the drainage is hardly changed. Therefore, the blending ratio of the inorganic powder is 20% by weight or more. It is difficult to achieve good formation and pinhole level with fuel paper. Even if 10% by weight or more of the fine fibrous cellulose is blended, the improvement of the paper strength is leveled off, and the drainage property at the time of papermaking is greatly reduced due to the water retaining function of the fine fibrous cellulose. .

The flame-retardant paper for backing vinyl wallpaper according to the present invention is easily prepared by an ordinary wet papermaking method by adding a retention aid and a binder to a mixed slurry of a fiber raw material and an inorganic powder. can do. The paper machines used are cylinder, short-mesh, long-mesh, birch former, rotoformer.
The dryer may be any of a Yankee type, a multi-cylinder type and a through type.

As the retention aid, for example, as the cationic polymer compound, cationic starch, cationic polyacrylamide, polyethyleneimine, polyamide polyamine epichlorohydrin, cationic modified guar gum,
There are cation-modified polyvinyl alcohol, other cationic polymer compounds, etc., and they are not particularly limited. Examples of the anionic polymer compound include polyacrylamide, polymethacrylamide, oxidized starch, and other anionic polymer compounds, and are not particularly limited. Further, an adhesive such as soluble vinylon fiber or latex emulsion may be used for the purpose of maintaining the strength of the base paper.

The flame retardant used in the present invention is 21% by weight based on the organic content in the case of a guanidine sulfamate flame retardant in order to achieve the flameproof grade 3 or higher required for the flame-retardant paper for backing vinyl wallpaper. In addition to the above components, a guanidine phosphate-based flame retardant, a guanidine phosphate-based flame retardant, and the like, which are relatively expensive but require a small amount of flame retardant, can also be used, and the type of flame retardant is not particularly limited.

In the flame-retardant paper for backing vinyl wallpaper of the present invention, an internal and / or external sizing agent is added at the time of papermaking in order to prevent the paste from penetrating into the base paper when the vinyl wallpaper is applied. Is preferred. As the sizing agent to be used, an internally and / or externally added sizing agent such as an alkyl ketene dimer, a styrene acrylic type, a styrene amide type can be appropriately selected and used.

The flame-retardant paper for backing vinyl wallpaper of the present invention comprises a sheet obtained by wet-making paper by mixing fibers, inorganic powder and fine fibrous cellulose, and further applying a flame retardant to the sheet. Alternatively, it can be obtained by impregnation. In the flame retarding treatment, a commonly used flame retardant, for example, a guanidine flame retardant may be applied or impregnated by a commonly used impregnation method, for example, using a size press machine.

[0025]

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not of course limited thereto. In addition,% shown in Examples and Comparative Examples
All mean% by weight.

Examples 1 and 2 A 1: 1 mixture of NBKP and LBKP was disintegrated, and a pulp slurry was prepared by beating to a freeness of 550 ml by a conventional method. Calcium carbonate ("TP-121SDP" manufactured by Okutama Industry Co., Ltd., 0.5 μm in minor axis x 1.5 μm in major axis) and fine fibrous cellulose were added to this pulp slurry, and the pulp fibers and carbonic acid were thoroughly mixed. A mixed slurry of calcium and fine fibrous cellulose was prepared.

Polyester fiber (diameter 10 μm, fiber length 3 mm, made by Kuraray) as organic fiber was added to this mixture.
1% was added based on the total weight. Cationic polymer compound (polyamide polyamine epichlorohydrin, manufactured by Dick Hercules, "Epinox") 0.6% as a retention aid in the fiber slurry, anionic polymer compound (polyacrylamide, manufactured by Allied Colloid,
"Percoll 173") 0.05% was added to each of the total weight of the fibers to prepare a stock, and the freeness was measured, and the basis weight was about 60 g / m using a laboratory handmade machine.
^{2. A} sheet having a density of 0.6 g / cm ³ and a calcium carbonate content of 25% after impregnation with a flame retardant was prepared.

This sheet was impregnated with guanidine sulfamate as a flame retardant in an amount of 21% with respect to the organic content. The composition of the flame retardant impregnating liquid is polyvinyl alcohol (Kuraray,
"Poval 117"): Starch (Oji Cornstarch, "Oji Ace A"): Guanidine sulfamate flame retardant (Dainippon Ink and Chemicals, "SG-2"): Acrylic System sizing agent (“Hamacoat S900G” manufactured by Misawa Ceramic Chemicals) = 6: 10: 80: 4.

According to the above method, the flame-retardant paper (Example 1) containing 3% of the fine fibrous cellulose in the total weight of the paper and the fine fibrous cellulose contained 8% by weight. % Flame retardant paper (Example 2) was prepared.

These flame-retardant papers were evaluated for pinhole level, formation, flameproof performance and paper strength. The pinhole level was measured according to the breathability test of the cotton fabric test method shown in JIS-L-1004. It can be judged that those with low air permeability have few pinholes, those with high air permeability have many pinholes, those with low air permeability of 5 cc / cm ² / sec or less are good, and air permeability is 5 cc / cm ² Higher than / sec was regarded as defective. The formation was visually confirmed, and a good one was marked as good and a bad one was marked as bad. Flameproof performance is JIS-
Z-2150 flame resistance test method for thin materials (4
5 degree Meckel-Burner method) is used to test the flame
Those that passed the grade were marked, and those that failed were marked as negative.
Regarding the paper strength, the tensile strength test method for paper and paperboard shown in JIS-P-8113, and JIS-P-8116
It was measured according to the tear strength test method for paper and paperboard shown in. The results are shown in Table 1.

Example 3 A flame-retardant paper was prepared after measuring the freeness in the same manner as in Example 1 except that the proportion of calcium carbonate was adjusted to 35% based on the total weight of the paper. Table 1 shows the results of evaluating the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Example 4 The mixing ratio of calcium carbonate to the total weight of paper is 35%,
After measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 8%,
I made a flame-retardant paper. Table 1 shows the results of evaluating the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Example 5 A flame-retardant paper was prepared after measuring the freeness in the same manner as in Example 1 except that the proportion of calcium carbonate was adjusted to 40% based on the total weight of the paper. Table 1 shows the results of evaluating the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Example 6 The mixing ratio of calcium carbonate to the total weight of paper is 40%,
After measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 8%,
I made a flame-retardant paper. Table 1 shows the results of evaluating the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 1 Except that the blending ratio of calcium carbonate based on the total weight of the paper was set to 10% of the level of conventional flame-retardant paper and the blending ratio of fine fibrous cellulose was adjusted to 0%. After measuring the freeness in the same manner as in Example 1, a flame-retardant paper was prepared. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 2 The proportion of calcium carbonate was 15% based on the total weight of paper.
After measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 0%,
I made a flame-retardant paper. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 3 The proportion of calcium carbonate based on the total weight of paper was 15%,
After measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 1%,
I made a flame-retardant paper. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 4 The proportion of calcium carbonate was 15% based on the total weight of paper.
A flame-retardant paper was prepared after measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 12%. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 5 The proportion of calcium carbonate was 25% based on the total weight of paper.
After measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 0%,
I made a flame-retardant paper. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 6 A calcium carbonate content of 25% based on the total weight of paper,
After measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 1%,
I made a flame-retardant paper. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 7 The mixing ratio of calcium carbonate to the total weight of paper is 25%,
A flame-retardant paper was prepared after measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was adjusted to 12%. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 8 A flame-retardant paper was prepared after measuring the freeness in the same manner as in Example 1 except that the flame retardant was added in an amount of 20% with respect to the organic content. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 9 Example 1 was repeated except that the beating degree of the pulp was increased to 450 ml and the fine fibrous cellulose was adjusted to 0% based on the total weight of the paper.
After measuring the freeness by the same method as above, a flame-retardant paper was prepared. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

Comparative Example 10 The proportion of calcium carbonate was 40% based on the total weight of paper.
After measuring the freeness in the same manner as in Example 1 except that the blending ratio of the fine fibrous cellulose was set to 0%, a flame-retardant paper was prepared. The pinhole level, formation,
Table 2 shows the results of evaluation of flameproof performance and paper strength.

Comparative Example 11 By the same method as in Example 1 except that calcium carbonate was adjusted to 40% and fine fibrous cellulose was adjusted to 0% based on the total weight of the paper, and the basis weight of rice was adjusted to 110 g / m ^2. After measuring the freeness, a flame-retardant paper was prepared. Table 2 shows the results of evaluation of the pinhole level, formation, flameproof performance, and paper strength of this flame-retardant paper.

[0046]

[0047]

As can be seen from Table 1, as shown in Examples 1 to 6, even if the flame retardant content is 21% with respect to the organic content, which is the level of the prior art, the content of the inorganic substance is high, so that Paper content remains at levels below 13%. Even so, the flame resistance can pass the third grade. In addition, in Examples 5 and 6 in which the blending ratio of the inorganic powder was 40%, which was relatively high, the tear strength tended to be slightly lowered.

On the other hand, as can be seen in Comparative Examples 1 and 2, the blending ratio of the inorganic powder at the level of the prior art is 14% or more with respect to the paper, which is required to exhibit the flameproof property.

In Comparative Example 3, 1% of fine fibrous cellulosic was blended at the conventional powder level of inorganic powder, but at this level both the drainage and tensile strength were fine fibrous cellulosics. In addition to the fact that the effect of blending the flame retardant is not recognized, the blending ratio of the flame retardant required for exhibiting the flameproof property is 14% or more with respect to the paper.

In Comparative Example 4, a large amount of fine fibrous cellulose was blended, but at this level, the freeness was greatly reduced, and the handling property at the time of papermaking was lowered.

Even if the amount of the inorganic powder in the paper is in the appropriate range as in Comparative Examples 5 and 6, the fine fibrous cellulose content of less than 2% by weight exhibits flameproofness. Although the flame retardant compounding ratio required to do this can be kept low,
The effect of the fine fibrous cellulose blending is not recognized with respect to the tensile strength.

In Comparative Example 7, even if the content of the inorganic powder in the paper was within the proper range, the composition containing a large amount of the fine fibrous cellulose was significantly reduced in the freeness and the papermaking This leads to deterioration of handling property.

When the content of the flame retardant is less than 21% based on the organic content as in Comparative Example 8, the flameproof class 3 required for flame retardant paper cannot be passed.

As in Comparative Example 9, the blending amount of the inorganic powder is set to an appropriate amount, and the pulp fiber is set to a lower freeness level than that of the conventional one so as to have water retention without blending the fine fibrous cellulose. In this case, the pinhole and the formation level are good, but the tear strength, which is the mechanical strength, is significantly reduced, which is not practical.

Even if the blending ratio of the inorganic powder is set high as in Comparative Example 10, the one in which the fine fibrous cellulose is not blended has a high drainage, and has a pinhole level and a formation level. Cause deterioration.

In Comparative Example 11, the amount of the flame retardant required was reduced by adding a high amount of the inorganic powder, and the rice basis weight was 1 in order to improve the good pinhole and formation level.
There is no choice but to raise it to 10 g / m ² .

[0058]

As described above, according to the present invention, the inorganic powder is contained in an amount of 20% by weight or more and 45% by weight or more.
The flame-retardant paper supporting less than 2% by weight or more and less than 10% by weight of the finely-fibrous cellulosic material has less pinholes and good formation, and is flameproof with a small amount of flame retardant. It is possible to provide an effective flame-retardant paper for vinyl wallpaper lining having a basis weight of less than 100 g / m ² .

Front Page Continuation (72) Inventor Mina Yoshida 1-10-6 Shinonome, Koto-ku, Tokyo Shin-Oji Paper Co., Ltd. Tokyo Commodity Research Institute (72) Inventor Yoshiaki Kabayama 1-10-6 Shinonome, Koto-ku, Tokyo Shin-Oji Paper Co., Ltd., Tokyo Commodity Research Institute (72) Inventor Yasuyuki Yamaji No. 2 Hirai, Hirai-cho, Nishitama-gun, Tokyo Inside Nippon Steel Mining Co., Ltd. (72) Takehiko Yoshida Hirai, Hinode-cho, Nishitama-gun, Tokyo No. 2 in the letter missing Nittetsu Mining Co., Ltd.

Claims (1)

[Claims] 1. A flame-retardant paper for lining a vinyl wallpaper having a rice basis weight of 100 g / m ² or less, which is provided with flame retardancy by coating or impregnating a sheet made by mixing paper with fibers and inorganic powder with paper. In the above sheet, (1) the inorganic powder is added in an amount of 20% by weight or more and less than 45% by weight based on the total weight of the flame-retardant paper,
And (2) a flame-retardant paper for backing vinyl wallpaper, characterized in that it contains the fine fibrous cellulose in a range of 2% by weight to less than 10% by weight based on the total weight of the flame-retardant paper.