JPS616399A - Fire retardant inorganic paper and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flame-retardant inorganic paper made of aluminum hydroxide powder, which has excellent flame retardancy and dimensional stability, is strong at room temperature, and does not contain asbestos.

Flame-retardant paper is mainly used for building materials such as wall materials, ceiling materials, and flooring materials, and such papers include flame-retardant asbestos paper, flame-retardant pulp paper, and aluminum hydroxide powder paper 0 Flame-retardant asbestos paper Paper is made by fixing asbestos, a non-combustible material, with flame-retardant rubber latex.
It is an excellent paper that contains few combustible components, exhibits excellent flame retardancy, and exhibits little dimensional change due to changes in temperature and moisture content. However, asbestos poses health problems and is no longer a commonly used raw material. Reflecting this, the amount of asbestos used has been on the decline in recent years, and many studies have been conducted on alternatives.

Flame-retardant pulp paper is made of pulp to which a flame retardant has been added as a beater or has been post-processed, and is a paper in which combustible materials are rendered flame-retardant with chemicals, and there are many problems in its use. For example, the water absorption rate is high and dimensional changes are large, the flame retardant comes off when soaked in water, and there is a risk of light damage. It may change in quality due to the heat of the processing process. In addition, its strength at high temperatures is weak, so its use as a building material is limited.

Aluminum hydroxide powder paper is published in Japanese Patent Publication No. 57-171799.
This is a flame-retardant paper that has started to appear in recent years and is disclosed in No. 1, and is made by adsorbing or trapping a large amount of aluminum hydroxide powder in a nozzle. Such aluminum hydroxide paper has excellent flame retardancy, but like flame-retardant pulp paper, it has poor dimensional stability and high-temperature strength, and also has insufficient abrasion resistance. As a result of intensive research in order to provide paper that does not contain asbestos, has excellent dimensional stability, strong strength at high temperatures, and does not contain asbestos, we have developed an aggregated inorganic fibrous material or inorganic scale material containing a large amount of aluminum hydroxide powder. It has been found that inorganic paper made of a dissolved polyvinyl alcohol-based fibrous binder is superior.

That is, the present invention uses aluminum hydroxide, powder 60-90%
, 5 to 30% pulp-like material, 50'-90 parts of aggregates composed of 3 to 30 parts of gono latex, 2 to 40 parts of inorganic fibrous material or inorganic scale material, and polyvinyl alcohol-based fibrous material. Basically, it consists of 15 to 20 parts of a binder solution, and if necessary, 30 parts or less of an organic fibrous material having a tensile strength of 2 to 15 v/denyl is added for slipping (combustible material).
, /(aluminum hydroxide powder) is a flame-retardant inorganic paper of 0.8 or less, in which an inorganic fibrous substance or an inorganic scale-like substance and a polyvinyl alcohol-based fibrous inder melt are present between the aggregates. The present invention provides a flame-retardant inorganic paper in which aggregates and inorganic fibrous materials or inorganic scale-like materials are firmly bonded with a dissolved polyvinyl alcohol-based fibrous binder. It has excellent flame retardancy as the ratio of combustibles to aluminum hydroxide powder is small, and it does not cause any health problems because it does not contain any asbestos. In addition, the aluminum hydroxide powder is firmly fixed with rubber latex, and the aggregates and inorganic fiber-like substances or inorganic scale-like substances (hereinafter referred to as inorganic fibers and scale-like substances) are bonded to a polyvinyl alcohol-based fibrous binder (hereinafter referred to as inorganic fibers and scale-like substances). The aggregate is firmly bonded with a melted PVA-based fibrous binder,
The characteristics of the inorganic IR fiber/scaly material and the dissolved PVA-based fibrous binder are effectively utilized. Due to this interaction, it has excellent flame retardancy, is strong at room temperature and at high temperatures such as 180°C required for cushion floor base materials, has little dimensional change due to temperature changes and moisture content changes, and has excellent flame retardancy. There is no itching phenomenon caused by JP-A-57-1.
This paper has excellent performance and does not cause the paper material to come off due to slight friction, which was the problem with the aluminum hydroxide powder paper in No. 71799.

It is important for such paper to meet the above conditions; if even one of them is missing, the paper with the excellent performance of the present invention cannot be obtained.

For example, if other inorganic powders are used in place of aluminum hydroxide powder, paper with excellent flame retardancy cannot be obtained, and even if the ratio of combustible materials to aluminum hydroxide powder becomes large, flame retardance will not be obtained. Enough will be enough. When the aggregates are not contained, the paper is an inorganic fiber paper or an inorganic scale paper that does not contain aluminum hydroxide powder, and the paper is far different from the flame-retardant inorganic paper of the present invention, and has insufficient flame retardancy and cannot be used as a floor paper. Workability such as plane smoothness, which is a necessary characteristic of materials, is significantly impaired. Flame-retardant inorganic paper that does not contain inorganic fibers or scales has low strength at high temperatures and undergoes large dimensional changes due to changes in temperature and moisture content. If PVA-based fibrous binder melt is not included, the characteristics of the aggregates, inorganic fibers, and scales cannot be utilized at all, and the strength at room temperature and high temperature is weak, and furthermore, dimensional changes due to changes in temperature and moisture content are large. .

The flame-retardant inorganic paper of the present invention is composed of aggregates composed of aluminum hydroxide powder, inorganic fibers and scales, and a dissolved PVA-based fibrous binder, and has nine excellent characteristics: Asbestos paper, flame-retardant pulp paper, and JP-A-5
This is completely unexpected with the technology of the aluminum hydroxide powder paper disclosed in No. 7-171799.

Furthermore, when an organic fibrous material (hereinafter referred to as an organic fibrous material) having a tensile strength of 2 to 15 V/denyl is blended into the organic/inorganic paper, the strong interaction with the dissolved PVA-based fibrous binder increases the υ bending strength. This is very preferable as the appearance is significantly improved. The amount of aggregates that should be present in the inorganic paper is 50 to 90 parts, preferably 60 to 85 parts. If the amount of lit, aggregate is less than 50 parts, flame retardancy will be insufficient, and if it exceeds 90 parts, dimensional stability,
The strength at high temperatures decreases and there is no favorable tL. In addition, the ratio of (combustibles)/(aluminum hydroxide powder) of flame-retardant inorganic paper is preferably 0.8 or less, preferably 0.6 or less. If this value is greater than 0.8, the flame retardance will be insufficient. It's not right.

The aluminum hydroxide powder used in the present invention is effective in imparting flammability to combustible materials, and the average particle size is 80μ or less.
The amount present in the aggregate is preferably 60-90%, preferably 65-85%. 60% aluminum hydroxide powder
If it is less than 90%, the flame retardancy will be insufficient, and if it is more than 90%, the size of the aggregates will become large, and the homogeneity of the obtained flame-retardant inorganic paper will not be adversely affected.

The pulp-like material used in the present invention may be obtained by sonic digestion of natural products, or may be obtained by uniaxially stretching a small synthetic polymer material and beating it into a pulp, or by manufacturing process of synthetic polymer material. It does not matter if the raw material monomers are prepared and polymerized or condensed I7 under a certain shear stress as long as the form is pulp-like. In particular, pulp obtained by cooking wood is preferable in terms of price and supply, and as such a pulp-like product,
Examples include kraft pulp, sulfide pulp, dissolving pulp, ground pulp, and Himikumikarubal 7, and bleached pulp or unbleached pulp may also be used. Polyvinyl alcohol-1 resin uniaxially stretched as a bulb-shaped product made of a synthetic polymer substance, or a copolymer resin film whose main component is polyvinyl alcohol-1 nitrile (Runo or #, j
F1. (Knocking out I-shaped items!! r items, etc.', :S' rD,
There are also synthetic velvets made of polyethylene such as SWP (manufactured by Mitsui Zerabakku Co., Ltd.), or knock-up velvets made of aramid. Such a valve-like substance is effective in adjusting the size of the annual body, and it is best to have 5 to 30 pieces in the aggregate, preferably 1L2 or 7 to 20 pieces. 9-Good. If the amount of bulb-like substances is less than 5%, the size of the aggregates becomes large, and flame-retardant inorganic paper with a homogeneous composition is not obtained. I don't like it.

The rubber latex used in the present invention strongly binds to the aluminum hydroxide powder, and also acts on the bond between aggregates, as well as between the aggregates and inorganic fibers, scales, or organic fibers. This brings about effects such as imparting friction resistance and flexibility to the flame-retardant inorganic paper of the invention, and improving strength. Such rubber latex may be a latex made of a synthetic polymer or a natural latex, and may be anionic, cationic, nonionic, or amphoteric. Examples include styrene-butadiene copolymer latex, polybutadiene latex, acrylonitrile-butadiene copolymer latex, acrylonitrile-styrene-butadiene copolymer latex, polychloroprene latex, polyvinyl chloride latex, polyvinylidene chloride latex, and various chlorinated latexes. Examples include vinylidene copolymer latex, polyisoprene latex, natural rubber latex, ethylene-vinyl acetate copolymer latex, acrylic ester homopolymer latex, and various allyl ester copolymer latexes. Such latex should be present in the aggregate in an amount of 3 to 30%, preferably 5 to 20%. If the rubber latex content is less than 3%, the abrasion resistance and flexibility will be low;
Exceeding this is not preferable as it adversely affects paper-making properties, flame retardancy, etc.

The molecular flocculant and trivalent metal salt used in the present invention are used in the form of an aqueous solution to prepare an aggregate slurry, and act on the aggregation of aluminum hydroxide powder and rubber latex. The polymer flocculant is used in an amount of 0001 to 0.5% based on the solid content of the slurry to be flocculated; if it is less than 0.001, the flocculation will be insufficient, and if it is more than 0.5, the size of the aggregates will be large. I like it, I don't like it. Such polymer aggregates include polyacrylamides with a molecular weight of 200,000 or more,
Modified polyacrylamides, sodium polyacrylates,
Examples include acrylamide/sodium acrylate copolymers, polyethylene glycols, and the ionicity may be cationic, nonionic, or anionic. One of the features of the present invention is that the aggregation can be completed regardless of the ionicity of the Vi flocculant. The trivalent metal salt should be added in a proportion of 0.01 to 0.01 to the solid content of the slurry that should be added without crystallization water.
If O, C is less than 11%, the agglomeration may not be completed completely and some turbidity may remain, and if it is more than 10%, the agglomerate becomes too hard and has an adverse effect on the texture of the resulting paper, which is not preferable. . Examples of such metal salts include aluminum salts such as aluminum sulfate and aluminum chloride, and ferric salts such as ferric chloride and ferric nitrate.

The inorganic fibrous material or inorganic scale material used in the present invention can be effectively utilized in the flame-retardant inorganic paper due to its large Young's modulus, fibrous or scaly shape, and resistance to heat or water pressure. It is expected that this will significantly improve the dimensional stability and strength of the flame-retardant inorganic paper without compromising its flame retardancy. The amount of the inorganic fibers/pieces used is 2 to 40%, preferably 5 to 25 parts.

If the amount of inorganic fiber/scaly material is less than 2 parts, the writing effect will be lost, and if it is more than 40 parts, the smoothness will be impaired, which is not preferable. In the case of an inorganic fibrous material, it is preferable that the ratio of the long side to the short side is at least 5 or more and the fiber content is 5% or less, and the cross-sectional shape may be arbitrary. Such fibrous materials include glass fiber, slag wool, rock wool, alumina silicate a
fiber, quartz fiber, alumina fiber, potassium titanate fiber,
Examples include boron nitride fibers, zirconia fibers, carbon fibers, silicon carbide rims, and titanium dioxide W-set barium titanate fibers. The inorganic scale-like material preferably has a long side of 0.5 mm or more, and includes potash, iron mica, sericite, phlogopite, biotite, and the like.

The polyvinyl alcohol-based fibrous binder melt used in the present invention firmly adheres and fixes the amount of substances constituting the flame-retardant inorganic paper, and significantly improves the strength of the flame-retardant inorganic paper at room temperature and high temperature. In addition to being effective, it also has an anti-itching effect. Such a binder melt is made of polyvinyl alcohol or V-based polyvinyl alcohol highly flammable composition.The dissolution temperature in water is 50 to 95°C, and the fibrous material with a fiber length of 2 to 10 m is dissolved in the flame-retardant inorganic paper manufacturing process. The polyvinyl alcohol has a degree of polymerization of 500 to 2,500. Saponification degree is 85.0~
99.9 molti is preferred, and various modified polyvinyl alcohols are also included. The amount of binder used is 0.
5 to 20 parts, preferably 3 to 15 parts. If the amount of the binder is less than 0.5 parts, sufficient strength and dimensional stability cannot be obtained, and if it is more than 20 parts, flexibility, flame retardance, etc. are adversely affected, which is not preferable.

The organic fibrous material with a tensile strength of 2 to 152/denier used in the present invention has high fiber strength (and has excellent adhesion to the PVA-based fibrous binder melt, improving the tensile and folding strength of flame-retardant inorganic paper. It is effective in preventing itching. The amount of !t used is 30 parts or less, preferably 3 to 20 parts. Such fibrous materials include rayon, vinylon, vinylon, etc. having a fineness of 0.1 to 10 deniers and a fiber length of 2 to 25 denier. Examples include fibers such as ester, nylon, acrylic, and voriclar.

The flame-retardant inorganic paper of the present invention can be easily produced using ordinary papermaking equipment by the following method.

Prepare an aqueous slurry containing aluminum hydroxide powder and bulb-shaped materials in a raw material tank equipped with a normal chest, bocher, or other stirring device, and add a polymer flocculant aqueous solution to the slurry 17- while stirring, in proportion to the purity of the solid content. It is added at a concentration of 0.001 to 0.05% and aggregated to a size suitable for paper making.

Further, rubber latex is added and adsorbed to the aggregates to complete the aggregation, so that the pure content is 0.01 to 10% based on the solid content of the slurry from which a trivalent metal salt aqueous solution is obtained, and stirring is continued. An aggregate slurry 17-' is obtained. The aggregates obtained by this method are not destroyed by normal agitation in paper making, are fibrous in form, have a length and thickness suitable for paper making, and are suitable for producing homogeneous, combustible inorganic paper. .

Further, as an alternative method for producing aggregate slurry, there is the following method, and the flame-retardant inorganic paper of the present invention can also be produced using aggregates obtained by such a method. That is, an aqueous slurry is prepared from aluminum hydroxide powder, a bulb-shaped material, and rubber latex in a chest or bocher of ordinary papermaking equipment, and a polymer flocculant aqueous solution is added to the slurry while stirring so that the purity is 0 with respect to the solid partial pressure of the slurry. Add so that it becomes .001 to 0.5 yen,
Furthermore, an aqueous trivalent metal salt solution slurry is added so that the pure content is 0.01 to 10% based on the solid partial pressure, and stirring is continued to obtain an aggregate slurry.

Such aggregate slurry 17-K inorganic fiber/scaly material, PV
The combustible inorganic paper of the present invention can be produced more easily than in K by mixing the A-based fibrous binder and, if necessary, an organic fibrous material and making paper using ordinary papermaking equipment.

The flame-retardant inorganic paper of the present invention is produced by preparing an aggregate from aluminum hydroxide powder, a bulb-like substance, and rubber latex, mixing the aggregate with inorganic fibers, scale-like substances, and a PVA-based fibrous binder, and then making paper. be done. However, in the aggregate preparation process, inorganic fibers, scales, and PVA
If a fibrous binder or the like is mixed, single aggregates of rubber latex will be liberated, contaminating the process, and the abrasion resistance and texture of the obtained flame-retardant inorganic paper will be poor, which is not preferable.

The wire bar of the papermaking equipment used may be a circular screen, short screen, or fourdrinier, and any paper screen such as verveni 7 ohmer, birch former, hydroformer, etc. may be used, and the drying part may be a multi-tube type or It can be any type of Yankee type, and is not limited to Hou Ni Trap. Further agglomeration] In the papermaking process, epoxy and melamine
Even if formalin-based, urea-formalin-based, acrylamide-based, or other paper strength enhancers are added, the paper will not fold. The addition of such a paper strength enhancer has been recognized to significantly improve the strength of the resulting flame-retardant inorganic paper.

Pressure roll treatment of the flame-retardant inorganic paper of the present invention heated to 80 to 220°C is effective in improving smoothness and strength at room temperature and high temperature, and is therefore very preferable.

The flame-retardant inorganic paper of the present invention does not contain busbestos, so there is no health hazard to the human body, and it can be used as a material such as twisted glass fiber paper.
There is no problem of itching that occurs with many molded products made from inorganic fibers. Moreover, it has strong tension at room temperature and high temperature, has little dimensional change due to changes in temperature and moisture content, and does not come off due to slight friction, making it suitable for building materials such as flooring, walling, and ceilings. Abrasion resistance in the present invention is determined by strongly rubbing the surface of a flame-retardant inorganic paper with a finger and visually determining whether the constituent substances come off. Flame retardancy is measured according to JISA-1322. All parts and %i used in the present invention are by weight unless otherwise specified.

The present invention will be explained below with reference to Examples.

Examples 1 to 4 Albanium hydroxide powder 75 to 85% and) N, B, KP 10 to 510 freeness (C8F) which is a rubber-like product
While the aqueous slurry was adjusted to 15% and stirred, a cationic polymer flocculant, IK Floc T-
884 (manufactured by Ichikawa Keori Co., Ltd.) aqueous solution was added to the solid content of the slurry so that the pure content was 0.05%, the inorganic powder and bulb were agglomerated, and rubber latex (Izut
l is also Nippon Zeon l! Chive ball 257 (lx
5 (SDR), Nilaball 157] (NBR) or Nilaball LX-854 (acrylic)? 5-10
% was added and adsorbed on the above aggregates, and then to complete the aggregation, aluminum sulfate was added so that the pure content was 10% based on the solid content of the aggregate slurry to obtain an aqueous solution, and the mixture was stirred for 5 minutes. The aggregate sura! J-], 0
Adjust / to a stainless steel container. Using such agglomerate slurry, 75 to 85 parts of aggregates, glass fibers which are inorganic fibers or inorganic scales, with a diameter of 9 μm and a length of 6 pieces (
(hereinafter referred to as glass 9μ, 6III) or mica 60 mesh passed product (hereinafter referred to as mica 60 mesh)
8 to 10 parts, and a polyvinyl alcohol-based fibrous binder with a dissolution temperature in water of 60°C and a fineness of 1f = -1v.
, long '33 wm II) V p B105-2 X
3. Prepare 7 to 15 parts of aqueous slurry (manufactured by Kuraray Co., Ltd.), use it to form wet paper with a basis weight of 106 to 1729/m" using a JISP8209 hand-sheeting machine, and dry it using a rotary dryer (Kumagai Riki Kogyo Co., Ltd. #). After drying at 11.0° C. for 120 seconds, the flame-retardant inorganic papers of Examples 1 to 4 were prepared.

The results are shown in Table 1 along with the following Examples and Comparative Examples.

Comparative Example 1 Using Seviolite, an inorganic powder, an aggregate slurry was prepared by the method of Practical Example 1, and further, an inorganic paper with a basis weight of 138 r/m was made using the aggregate slurry by the method of Example 1. .

Comparative Example 2 Aluminum hydroxide powder 40%, freeness 510 Go (C
8F) NBKP40%, Nila Ball 2570x5
(SBR) From 20%, the basis weight was 14:l/ by the method of Example 1.
m'' inorganic paper was made.

Comparative Example 3 Using the aggregate slurry of Example 1, flame-retardant inorganic paper with a basis weight of 10,697 m'' was made from the slurry alone by the method of Example 1.

Comparative Example 4 Aluminum hydroxide powder 80chi and Nilaball 2570
X5 (SBR) 20 pieces Agglomerate slub v-(l- was adjusted by the method of Example 1, and flame-retardant inorganic paper with a tsubo fit of 154?/rn' was made by the method of Example 1 using the aggregate. did.

Comparative Example 5 Aluminum hydroxide powder 85% and beating degree 510me
(CFS)"t'4 NBKP15%, 1:S, solid content of aggregate slurry was determined by the method of Example 1, and using this aggregate slurry, 80 parts of aggregate, 9μ of glass, 10 parts of 6w, VPB105-2x3 10 Using this aqueous slurry, a metal layer was placed on the wire mesh of a JISP8209 hand-made machine, and the gold layer soil had a basis weight of 12.
Make paper from 5 f/go wet paper and dry it with a rotary dryer.
It was dried at 10° C. for 120 seconds to produce flame-retardant inorganic paper.

Comparative Example 6 Aluminum hydroxide powder 64%, freeness 510 m/(
C8F) NBKI) 8%, glass 9μ, 6 tml
0% and VPB105-2X3 10%, an aqueous slurry (]- was adjusted and stirred, and an aqueous solution of IK Floc T-884, a polymer flocculant, was added in a pure content of 0.05% to the solid content of the slurry. Add it to make it 7.
Aggregate slurry solid content, then Nilaball 2570X
5 (SBR) 8% is added and adsorbed to the aggregate,
Further, an aqueous K m U aluminum solution was added so that the pure content was 1.0% based on the solid content of the aggregate slurry, and the mixture was stirred for 5 minutes to prepare an aggregate slurry.

A flame-retardant inorganic paper having a tsubo of 1 ton and 156 P/m'' was made by the method of Comparative Example 3 using only the aggregate slurry.

Examples 1 to 4 below are flame-retardant inorganic papers of the present invention which are free from trouble in the manufacturing process and are excellent in flame retardancy and other various properties.

On the other hand, in Comparative Example IVi, an inorganic paper (Sevioly) 1, which is an inorganic powder, was used in place of the aluminum hydroxide powder, and the inorganic paper had no flame retardancy. Comparative Example 2 has a ratio of (combustibles)/(aluminum hydroxide powder) of 1.94, which means that the amount of combustibles is too large compared to the aluminum hydroxide powder, and the flame retardance is insufficient.

Comparative Example 3 contains inorganic fibers, scales, and PVA in the paper composition.
There is no fibrous binder, and the high temperature strength and dimensional stability at room temperature and 180°C are insufficient.

In Comparative Example 4, there was no bulb-like material in the aggregate, so paper with good texture could not be obtained. In Comparative Example 5, since there is no rubber latex, the aggregates are broken even with small shear stress, and JI
In the hand-sheeting machine SP-8209, about 1/2 of the aluminum hydroxide powder escapes from the wire mesh, making it impossible to obtain paper with the target composition. Then, a gold phase was placed on a wire mesh, and paper was made by the method of Example 1.

Such flame-retardant inorganic paper is difficult to make using conventional methods, and furthermore, its abrasion resistance is insufficient. Comparative Example 6 Since inorganic fibers and PVA-based fibrous binder are mixed in the Vi aggregate preparation process, individual aggregates of rubber latex are released during aggregation, causing process contamination and deteriorating friction resistance.

Example 5 Aluminum hydroxide powder 80%, freeness 510 at (C
SF) (7) NBKPI 0%, Nirapol 2570X
5 (SBR) Prepare a 10% aqueous slurry, add IK Floc T-884 water-based slurry to the slurry so that the pure content is 0.05% based on the slurry solid content, and further add aluminum sulfate aqueous solution to the slurry solid content. The aggregate slurry was adjusted to Ii4 by adding so that the pure content was 10%. Using such aggregate slurry, Example 1
A combustible inorganic paper with a basis weight of 148 P/m'' was produced using the method described above.The results are shown in Table 2 along with other examples.

The obtained flame-retardant inorganic paper passed the flame retardant grade 1 and 2
It has a breaking length of 0.98 km at 0°C, a breaking length of 0.43 km at 180°C, an elongation rate of 0.12% after being immersed in water for 24 hours at 20°C, and has excellent abrasion resistance and strength. The case is the same as in Example 1. This flame-retardant inorganic paper is obtained by changing the point of addition of the polymer flocculant to after the addition of rubber latex in Example 1, but it is an excellent flame-retardant inorganic paper with good performance.

Examples 6 to 7 The aggregate slurry of Example 1 was prepared in the chest of a test paper machine, and the slurry was prepared using 80 parts of aggregate, 9 μm of glass.
, 6 m 1 O parts, VPB 105-2 x 31 O parts aqueous slurry was adjusted, and a wet paper with a mixing ratio of 1:1 was made using a circular mesh/short mesh combination paper machine, and the same was prepared as in Example 6 using a Yankee dryer at a temperature of 125°C. Flame-retardant inorganic paper with a basis weight of 134 f/m'' was produced.

The flame-retardant inorganic powder paper of Example 7 was prepared by passing the flame-retardant inorganic paper three times through heated rolls at 150° C. with a roll interval of 80 inches of paper thickness.

Example 8 The agglomerate slurry of Example 1 was prepared in the chest of a test paper machine, and the slurry was used to prepare 75 parts of agglomerate and 9μ of glass.
, 6ms 10 parts, VPB105-2x310 parts, organic fibrous material having a tensile strength of 7f/denier, a fineness of 1 denier, and a fiber length of 5cm, water-insoluble vinyl fiber (hereinafter referred to as VPB)
An aqueous slurry of 5 parts (referred to as 103×5) was prepared, and this slurry was made into paper using the method of Example 6 and dried to produce a combustible inorganic paper having a basis weight of 148 f/m.

Table 2 The papers of Examples 6 to 8 are all flame-retardant inorganic papers of the present invention and have excellent flame retardancy and Sendai seed paper performance.

Example 7 is a paper that has been subjected to hot pressure roll treatment as in Example 6. The hot press roll treatment is effective in improving smoothness, room temperature tear length, and the like. Example 8 adds VP, which is an organic fibrous material, to Example 6.
In the paper further containing B103X5, the inclusion of organic fibrous material is very effective in increasing paper strength without impairing flame retardancy.

Claims (1)

[Scope of Claims] 1. 50 to 90 parts of aggregates composed of 60 to 90% aluminum hydroxide powder, 5 to 30% pulp-like material, and 3 to 30% rubber latex, and inorganic fibrous material or inorganic scale-like material. (combustible material)/
(Aluminum hydroxide powder) is a flame-retardant inorganic paper of 0.8 or less, in which an inorganic fibrous substance or an inorganic scale-like substance and a dissolved polyvinyl alcohol-based fibrous binder exist between the aggregates, and A flame-retardant inorganic paper made by firmly bonding the aggregate and an inorganic fibrous material or an inorganic scale-like material with a dissolved alcohol-based fibrous binder. 2 (a) Prepare an aqueous slurry containing 60-90% of aluminum hydroxide powder and 5-30% of a pulp-like material, and add a polymer flocculant to the aqueous slurry at a rate of 0.001-0.5% based on the solid content of the slurry. % to make it coagulate once, further mix 3 to 30% of rubber latex, and then add trivalent metal salt to 0.01 to 10% of the solid content of the aggregate slurry at this stage.
Adjust the aggregate slurry by adding % or (b) aluminum hydroxide powder 60-90%,
An aqueous slurry is prepared by mixing 5 to 30% of pulp material and 3 to 30% of rubber latex, and a polymer flocculant is added to the slurry in an amount of 0.001 to 0.5% based on the solid content of the slurry. Metal salt to slurry solid content 0.01
~10% is added to prepare an aggregate slurry, and 2 to 40 parts of an inorganic fibrous material or an inorganic scale material and a polyvinyl alcohol-based fibrous binder are added to 50 to 90 parts of the aggregates of (a) or (b) above. 0.2 to 20 parts,
If necessary, add up to 30 parts of an organic fibrous material with a tensile strength of 2 to 15 g/denyl, and adjust the ratio of (flammable material)/(aluminum hydroxide powder) to 0.8 or less during papermaking. A method for producing characteristic flame-retardant inorganic paper.