JPS616167A - Hydraulic inorganic papered product and manufacture - 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 A Technical Field of the Invention The present invention relates to a hydraulic inorganic paper product that essentially has excellent mechanical performance without using asbestos, and a method for producing the paper product as described in Section 7. It is about the method.

B. Prior art and its problems Hydraulic inorganic paper products are composites whose main components are la, fibers such as asbestos, and hydraulic substances such as cement, as typified by asbestos slate boards.

The main manufacturing method is to make a 5-30% by weight aqueous dispersion (papermaking slurry) of a fiber component such as asbestos and a hydraulic binding component such as cement together with other additives, and then pour this onto a round net or fourdrinier. This is a wet papermaking method in which the paper is made into paper, dehydrated, molded, hardened, and dried to produce a product.

This method is highly productive with simple equipment, and provides a high-strength, inexpensive noncombustible material, and such products are used in large quantities as building materials in a wide range of fields.

The role of asbestos in such hydraulic inorganic paper products is (1)
Effect of imparting high productivity in the papermaking process (a) Improving uniform dispersibility of the fibers used in combination (b) Capturing particulate matter, mainly hydraulic substances, and imparting suitable water resistance (C) Making roll Prevention of delamination and wrinkle 1 water cracking phenomenon during molding and forming rolls (dl surface smoothness, imprinting during press molding imparts flexibility +e) Improving the strength of green sheets (improving handleability)
(2) Ensuring product physical properties (reinforcement of hydraulic substances) (a)
Improvement in mechanical properties such as bending and tensile strength and impact strength (b) Improving dimensional stabilityfc) It is said to improve durability. Furthermore, the properties of the hydraulic material, such as non-combustibility, are hardly reduced. In addition, it is a very cheap substance.

As described above, the asbestos side in inorganic paper products is extremely important, which is why it is said that such inexpensive products with excellent physical properties would not be possible without the presence of asbestos.

The excellent properties of asbestos include that asbestos is a fibrillar material, has high affinity with hydraulic substances, has high tenacity and high Young's modulus, is an inorganic fiber, and has high water retention. caused by.

On the other hand, asbestos is used when manufacturing and processing products containing asbestos. During construction, dust is generated in the air.

In recent years, it has become clear that fine asbestos dust, if inhaled into the human body, can cause lung cancer, etc., and its use is gradually being restricted by laws and regulations, and there are even signs that its use may be banned.

Asbestos-producing countries are unevenly distributed in specific countries, and there is also the problem of resource depletion.

Under such circumstances, it is strongly desired to provide a hydraulic inorganic paper product that does not contain stone M at all and has the same high productivity and performance as when using asbestos, instead of a hydraulic inorganic paper product that contains a large amount of asbestos. ing.

Attempts have been made to replace asbestos with other materials to produce products using a wet papermaking method, but these have not been sufficient and have only been used for very limited purposes.

The reason for this is that there is no substitute that satisfies asbestos's excellent properties of absorbing hydraulic substances, preventing delamination, imparting moldability, and providing excellent reinforcing properties.

JP-A-55-121947, JP-A No. 55-12194 R
The combination of pulp, flocculant, and glass fiber improves the dispersibility of glass fiber and the ability to capture hydraulic substances, etc., and is intended to replace asbestos.

Both the capture ability and the opacity. In particular, although the effect of the flocculant 1 can be seen in terms of trapping ability, it is still only about 70% trapped, which is a problem in terms of operational physiology. Furthermore, problems such as interlayer peeling have not been solved.

In addition, Japanese Patent Publication No. 57-60315 discloses a technology that improves the product's physical properties by using pulp and relatively thin fibers (for example, rock wool) to capture hydraulic substances, and by using alkaline glass fibers. .

Nuclear technology also has insufficient ability to trap hydraulic substances, and delamination and molding are major problems. Additionally, the reinforcing effect is insufficient due to the poor dispersion of the alkali-resistant glass fibers, and the surface properties of the product are also poor.

In JP-A-59-73463, attempts have been made to improve the trapping of hydraulic substances using bentonite and pulp, and to increase the reinforcing effect using vinylon and the like.

Although the use of bentonite is effective in trapping hydraulic substances, the dispersibility of reinforcing fibers is poor and it is difficult to obtain a reinforcing effect unless a method for using 6C1 or bentonite is determined in terms of opaque content.

All of the above-mentioned known techniques are too light to replace asbestos, which has a number of excellent properties as described above, and are far from achieving the high productivity and excellent physical properties of the product when using one M6 stone.

The present inventors believe that in order to replace asbestos, which has such excellent properties, it is important to combine various components and bring out synergistic effects in addition to the properties of each component, and as a result of intensive research, they have arrived at the present invention. It's a good thing.

C) Structure of the present invention The gist thereof is +a1 The dispersion number of bentonite and TBL pulp having a swelling degree of 2 to 10 as defined in the present invention, tc) ultrafine reinforcement, (d) natural ox/ζ/ and artificial fibrous inorganic material. A hydraulic inorganic paper product obtained by dispersing and then (e) adding a cement temple's hydraulic inorganic material to a paper-making nullary, and if) adding a flocculant to the paper-making product and its manufacturing method. be.

The present inventors proposed Japanese Patent Application No. 58-1312) 51 based on the same idea as the present invention of compositing the components of loincloth, but the dispersibility of fibers such as reinforcing fibers, cement, etc. The scavenging ability of hydraulic inorganic materials, anti-delamination properties, surface properties, molding properties, etc. are lacking in - and -8-, and the present invention is the result of studies focusing on improving these. There is a standby where bentonite is used. That is, due to the characteristics of bentonite itself and the synergistic effect with other substances, it is possible to provide a wet paper-made product that is free of asbestos and has high productivity and daytime performance.

The first problem with wet paper-formed products in asbestos-free systems is poor dispersibility of fibers such as reinforcing fibers.

Such dispersibility is achieved by using bentonite of the present invention with a specified 'fC swelling degree in a specified manner,
It is greatly improved.

That is, the pulp, which is a component of the present invention, is equivalent to 1 to dAf k 9) relative to the total solid content of the papermaking slurry.

Either 2 to 20% of bentonite with a swelling degree of 2 to 8 is added to the aqueous dispersion dispersed in the water, or the pulp is added to the bentonite mixture.
After that, make a water dispersion 7 by dispersing the water using a halber or the like. Because of the water dispersion, the reinforcing ultrafine 4 and natural and/or traps are made by completely cooling the artificial fibrous inorganic material (hereinafter abbreviated as fibrous inorganic material), stirring and dispersing it, and then adding it to the specified hydraulic inorganic material. It has the power to be used as a slurry for paper making.

Water dispersion of bentonite and pulp (I & C reinforcing fibers,
The key point is to improve the dispersibility of fibrous fibers, etc. (adding walls is the key to improving the dispersibility of 11f).

Beartona 1′ To expansion; 1 light wind and (Shiri, Do) means the value obtained based on the predetermined method, i.e. (a) - Tomagaki known bundle note F paper 165 C1], O decoy φ is approximately Mounted on a crow r doo of 60 countries φ, traced bentonite phantom] 5 on a kite.

(-4) Sprinkle distilled water at room temperature from above to moisten the sample.

(c) After that, in order to replenish the sample with the necessary amount of water, fix the In10-t so that the lower part of the F paper is submerged in ml of water, and
Leave it for 4 hours. Water will be replenished by capillary action of the F paper.

After leaving it for a while, take out the wet sample with F paper through a funnel and transfer it to a porcelain Buchner row (for 110φ) to remove the adhesion on the door paper.Weigh it after suctioning at 8 degrees (Wp) ( E) Next, dry it in a dryer at 105°C to a constant ffl and then weigh it (W2) (C) Separately, do the same with only the F paper and weigh it by 1 to make it the tare weight (wet paper). W3, dry F paper W4) (g) Calculate the degree of swelling using the following formula.

Ws -W3 Swelling degree -~V2- 'VV4-' Satisfactory dispersibility can only be obtained by adding reinforcing fibers etc. to an aqueous dispersion of bentonite and pulp having a swelling degree of 2 to 10 υ .

Satisfactory results cannot be obtained even when bentonite and pulp are used alone, or when bentonite and pulp aqueous dispersions are added to reinforcing fibers.

A second problem in producing wet paper products using asbestos-free yarn is the ability to trap hydraulic inorganic substances such as cement and other particulate matter, as mentioned above.

When the sheets are rolled up and laminated on a making roll, such as in the round net method, cracking occurs after cutting/unrolling into a flat shape, and delamination occurs between the laminated sheets.

Embossed patterns such as wavy patterns have problems with poor quality and surface smoothness. The capture rate of solid content in the papermaking slurry needs to be 85% or more, preferably 90% or more.

These various problems can be solved by adding bentonite with a swelling degree of 2 to 10 to 2 to 10% by weight based on the solid content of the papermaking slurry, and 1 to 1% of the pulp.
It has been found that a satisfactory solution is achieved only by a combination of ~8% by weight of fibrous minerals, 05-10 PPm of fibrous minerals, and 50-500 PPm of teardrops for hydraulic minerals.

The bentonite of the present invention is mainly composed of 1-montmorillonite group minerals, and means that its content is at least 40% or more.

Examples of montmorillonite group minerals include montmorillonite, beidellite, nontronite, hectorite, and saponite.

The degree of swelling of such bentonite is between 2 and 10, preferably V'
Must be i4-7. 2. In the case of non-excretion ridges, if the amount is small, it will have no effect at all, and if the amount is too large, the particulate matter trapping performance will be improved, but it will contribute to the dispersibility of the fibers and/or become hard. Perhaps because it is too much, delamination increases, and small cracks occur, making molding significantly worse.

If it is larger than 10, the swelling will be too large and the water will deteriorate, and the unlinter wire mesh or felt will be soiled, making it impossible to produce a uniform sheet.Also, part of the making roller or green plate will stretch, causing the roller to bend. This will result in a significant drop in productivity due to poor adhesion.

The amount of bentonite is 2 for the solid content trap of papermaking slurry.
~20% by weight. If the degree of swelling is small within the scope of the present invention, it is preferable to increase it, and if it is large, the opposite is preferable.

If it is less than 2% by weight, the effect is not as expected, and if it is more than 20% by weight, the same phenomenon as when the degree of swelling is too large is exhibited, which is not desirable. Note that it is preferable for the particle size to be 150 mesh or less.

In the present invention, the pulp content must be 1 to 8 pulps per solid content of the papermaking slurry.

If the amount is less than 1% by weight, the ability to trap particulate matter will decrease, and if it is more than 8% by weight, the flame retardancy of the product will be impaired and delamination will increase, which is not preferable.

Of pulp? In mM, either natural or synthetic groups may be used. Natural pulps are mainly unbleached and bleached pulps from softwoods and hardwoods, but straw is also used.

Pulp obtained from bamboo, cotton, hemp, ramie, kozo, mitsumata, etc. can also be used. Also newspapers and paper bags.

Recovered waste paper obtained from cardboard boxes etc. can also be used. Canadian freeness is preferably 30 to 750 d, more preferably 50 to 300 d.

Polyolefin thread pulp is a synthetic pulp.

For example, s'wp (polyethylene pulp manufactured by Mitsui Zerabakku), polyaramid yarn pulp, such as Keppra/<Lug (
(manufactured by DuPont) can be used, or any fibrillar material similar in shape to these can be used.

In the present invention, the fibrous inorganic substance has a thickness of 3 to 15 μm.
m, length 01 to 10 m, and may be made of natural or artificial materials other than asbestos.

Artificial fibrous inorganic substances include glass fibers, such as common A glass and E glass fibers, alkali-resistant glass fibers containing zirconium oxide, coarse fibers, and slag wool.

Rock wool, ceramic fibers, etc. may also be used, and two or more types of #I & fibers may be used in combination.

Such fibrous inorganic substances have a synergistic effect with other substances to improve the ability to trap particulate materials such as cement during papermaking.
The shorter the length, the greater the effect.

Therefore, the length σ of the fibrous inorganic material is the length when one paper is made,
That is, it means the length in the product, not the length of the raw material. Even if the length of the raw material is JO2 or more, it may be broken in mixers, pulpers, chests, etc., and 60% or more should be 0.1 to 10 mm, preferably 1 to 5 mm. It is said that if the diameter of the fiber is less than 3 μm in terms of yen, the Vit water resistance will be abnormally deteriorated and it will also be bad for health. There is no effect at 15μ or more. Compound JI! L is 0 relative to the solid content of papermaking slurry.
．． It is 5 to 10% by weight, preferably 1 to 5% by weight. 0
．． If it is less than 5% by weight, the effect will be poor, and if it is more than 10% by weight, the green sheet will become too hard and the water control properties for the making roll will be poor.Also, when it is rolled out into a sheet, cracking and delamination will easily occur, and the pattern will be poor. If attached, the quality will also be poor.

The flocculant may be a common flocculant. It may be organic, inorganic, or anionic, nonionic, or cationic, but anionic polymer flocculants commonly used as cement flocculants are preferably used.

The amount of flocculant used is 50 to 500 per hydraulic inorganic material.
ppm is preferred. If it is less than 50 ppm, the effect is poor, and if it exceeds 500 ppm, the Vi cohesive force becomes strong and the aggregates become large blocks, and the water properties are too good to make a uniform sheet because the head difference cannot be corrected. It's difficult. Furthermore, this results in contamination of the felt and loss of productivity.

As described above, only by combining the specified bentonite, pulp, fibrous inorganic material, and flocculant with the specified methods, water, which is the second problem in the production of hydraulic wet paper products in an asbestos-free system, can be solved. It has become possible to solve problems such as insufficient capture of particulate matter such as hard inorganic materials, cracking when rolling out from a making roll into a sheet, delamination, and poor moldability and surface quality.

The reason for this is not clear, but it seems that there is a synergistic effect, considering that each has a greater effect than expected from the effect of -≠product.

As mentioned above, asbestos has the role of improving the shelf life and reinforcing the product. In the absence of asbestos, a combination of reinforcing fibers is generally required, and the present invention also requires the use of known reinforcing fibers.

Delicate reinforcing materials are tensile strength, which is the weak point of hydraulic inorganic cured materials.
It improves bending and impact strength, but the improvement in tensile and bending strength is particularly important.

The conditions that the fiber must meet for this are the tensile strength of the fiber,
It is desirable that it has a high Young's modulus, that it has good adhesion to hydraulic inorganic materials such as cement, that it has alkali resistance, that it is free from water for health reasons, and that it is inexpensive.

The most preferable reinforcing fibers satisfying the above conditions are polyvinyl alcohol (hereinafter abbreviated as PVA) fibers, and polyacrylonitrile fibers are also preferably used. In addition, amide fibers, aramid fibers, carbon fibers, alkali-resistant glass fibers, etc. can also be used. These reinforcing fibers have a tensile strength of 5 g or more per denier and a Young's modulus of 5 g per denier. 99 (1' or more is required.

In addition, if the surface has been modified by chemical or physical means to improve its adhesion to hydraulic inorganic substances, even fibers that are inherently hydrophobic and have poor adhesion, such as polyolefin fibers, can have improved strength and Young's modulus. It can be used if it is above the above value. The blending amount must be 0.5 to 5% by weight, preferably 1 to 3% by weight, based on the solid content of the papermaking slurry. If it is less than 0.05% by weight, there will be no reinforcing effect, and if it exceeds 5% by weight, the fraction will be defective, making it impossible to obtain uniform sorting, and it will be expensive.

Furthermore, the preferable range of fineness is 0.1 to 20 deniers. Also, the aspect ratio (ratio of fiber diameter to 4a fiber length) is 2.
A preferable range is 00 to 900 in terms of dispersibility and reinforcement pillars.

Hydraulic inorganic substances that can be used in the present invention include the following. A typical example is Portland cement. Portland cement includes ordinary Portland cement, moderate heat Portland cement, early strength Portland cement, ultra early strength Portland cement, white Portland cement, and sulfate-resistant Portland cement. Mixed cements include blast furnace cement, silica cement, and flyanche cement. Special cements such as alumina cement, super fast hardening cement, colloidal cement, and oil well cement are used. It is also possible to use semi-hydrated ceracola using fine gypsum, a mixed hydraulic material of hydrated ceracola and slag, magnesia, etc., but basically any hydraulic inorganic material may be used.

It is also possible to replace a part of the hydraulic inorganic substance with another substance depending on the purpose. For example, lime-based materials such as calcium sulfoaluminate as an expansive admixture, perlite as a lightening agent, shirasu balloon, other silica sand shirasu, mica, serpentine, charcoal, clay, kaolin, talc, vermiculite, silica, and seviolite. , acpargite, etc. can be used.

D Effects and applications of the present invention As described above, the present invention uses specified materials, bentonite, pulp, reinforcing fibers, fibrous inorganic materials, and flocculants, in a specified method and within a specified range. By combining the properties of each material, the synergistic effect between the materials is added, resulting in high productivity and high performance asbestos-free hydraulic wet inorganic paper - 1fXl! ! It was successful in providing the product.

The asbestos-free hydraulic inorganic paper product obtained by the present invention can be used as a substitute for conventional asbestos-containing products, and because it does not contain asbestos, its use is expected to expand throughout history. can.

Examples of applications include corrugated asbestos-free boards, roofing materials such as Ankel, asbestos-free flat boards, perlite boards, pulp cement boards, siding materials, curtain walls, fireproof partition walls,
EXAMPLES The present invention will be explained with reference to examples below.

Example-1 Bentonite with a swelling degree of 4 and NUKP with a Canadian freeness of 130 Kl soaked in water and swollen.
(Softwood unbleached pulp) was added to a pulper with a slat stylus containing white water and stirred for 10 minutes at a roughness of about 2%.

After that, slag wool with an average diameter of 4μ, which is a fibrous inorganic material, and PVA fiber, which is a reinforcing fiber, are added at the same time.
Stir for a minute.

The slag wool was previously put into a pulper, added with shear, and then sieved to a size of 0.5 to 2 m.

Also, PVA fiber fiber wire 6 fibers 1.6 strands, strength 12
．． 5f/dr (dr stands for denier), Young's modulus 32
09/r.

Fiber length! A 5m+ one was used.

Portland cement, which is a hydraulic substance, was added to the aqueous dispersion, stirred for 5 minutes, and then transferred to a chest to form a papermaking slurry of about 1209/71.

The papermaking slurry was treated with an anionic flocculant (Ichikawa Keori's IK).
While adding floc T-210) and the required amount of white water,
The material was introduced into a papermaking tank (vat) and formed onto a 60-mesh round net, wound up on a making roller, and pressure-molded into a green board 2 after cutting at a pressure of 50 to 9/crA. The curing conditions are 50
After heating and curing at ℃ for 24 hours, it was left to air dry for 4 weeks.

The blending amount and data are shown in Table-1. The dispersibility shown in the coating means the dispersed state of the fibrous substance, and the unevenness on the round net when papermaking slurry is scooped up into the round net.
r6k E43. %, a very good fractional state with few bumps is ◎, a poor dispersion state with many bumps is marked as × and 2, and those in between are 2 ranks r (divided into ○ and △. Bat water level (d) is a sufficiently uniform sheet. ◎, if it is possible to extract
Cases in which the water level could not be adjusted to TL and only a uniform sheet was formed, and cases in which the water level was too low and the papermaking slurry exceeded the vat were qualitatively judged as ×, and the intermediate ranks as ○ and Δ. . In addition, the capture rate (%) of Portland cement, etc. is determined by the slurry concentration (Wl) before papermaking in the papermaking tank.
) and the water temperature (Wl) discharged through a round screen.
The judgment was made more qualitatively. The condition where the glabella is unclear and difficult to peel even when force is applied in the peeling direction is O1, and the condition where it is easily peeled is ×1, and the two ranks are divided into ○ and △.

To check for cracks during molding, a normal wave-forming mold was applied to the raw board after the making roll, and the state of the cracks was observed.

The strength of the bending was measured according to JISA12)081-Bending test method for architectural boards, and was expressed as an average value in the longitudinal direction and the lateral force direction. If the ability to trap hydraulic substances changes, the blending amount of reinforcing fibers will also vary, so in order to compare the true reinforcing properties, yield-corrected bending strength is shown.

The impact strength was measured only in the longitudinal direction without notches using the Izod test method of JISK-7110.

Comparative Examples-1 to 7 The blending amount and measurement data are shown in Table-1. Comparative Examples-1 to 7
1 to 4 are cases in which one of the five components other than the hydraulic substance among the substances constituting the present invention are chipped, and Comparative Examples 5 to 7 are cases in which two plants are chipped. 0 Reference Example-1 belonging to the known technology described above Stone M&K with a blending composition consisting of 1.3% Stone M6D, 2% unbeaten NUKP, and the balance consisting of Holtland Cement Paper was made using the same paper-making machine as Example-1, ε blade side and j-.

From Table 1, it is clear that Example 1 has superior paper formability and physical properties compared to Comparative Examples, and is equivalent to or better than Reference Example 1 using asbestos. If even one of the constituent absorbers of the invention is missing, it will not be possible to obtain the same formability and physical properties as asbestos. Comparative example-6~
8 belongs to the known technology, but when compared with Konedera, it can be seen how great the effect of the present invention is.

Examples-2 to 3, Comparative Examples-9 to 10 Blend amount f of bentonite in Example-1 3% (Example-2), 8 inches (Example-3), 1 inch (Comparative Example-9) ,1
5% (Comparative Example-10) and high-strength acrylic fibers (strength B, 5?/dr, -V) were used as reinforcing fibers.
Table 2 summarizes the results of paper making in the same manner as in Example 1, except that the puffer fish ratio was 150 l/dr)'i<.

Table 2 Note) In the case of Comparative Example 10, the P water was so poor that continuous operation was difficult.

Examples other than the examples have some problems and are not preferable.

Examples-4 to 5; Comparative Examples-11 to 12 The Canadian freeness of NUK J-' in Example-1 was set to 200 Ill, and Blend-1 was added to 2% (Example-4), 7 % (Example-5), 0.5% (Comparative example-
11) and 10% (Comparative Example 12), the paper was made in the same manner as in Example 1. The results are summarized in Table 3.

Table 3 All of the Examples have satisfactory results, but the Comparative Examples have some problems. Note that Comparative Example 7, which contains a large amount of pulp, is not preferable because the dimensional stability, which is a characteristic of hydraulic inorganic boards, is extremely poor.

Examples-6 to 7; Comparative Examples-13 to 12) The amount of slag wool in Example-1 was changed to 2% (Example-6), 8% (Example-7), and 0.2% (comparison). Example-13
), 15% (Comparative Example-12)) The results were shown in Cloth-4, where the paper was made in accordance with Example-1.

Table 4 Comparative Example 13 has poor dispersion of fibrous substances, poor reinforcing properties, and unsatisfactory ability to capture Portland cement and the like. In Comparative Example 12), the raw board was hard, peeling occurred between the eyebrows, and the mold appearance was poor. In addition, cracking occurred when it was rolled out into a sorted shape from a making roll.

Example-8; Comparative Example-15 Paper was made in exactly the same manner as in Example-1, except that in Example-1, the degree of swelling of Bentonai was 8 and the blending amount was 3% (Example-1). 8). In Example 8, paper was made in exactly the same manner as in Example 8, except that only bentonite was added at the same time as Bortland cement (Comparative Example 1).
5). The respective results are shown in Table-5.

Table 5: When all bentonite is added according to the method of the example, the dispersibility of fibrous materials such as reinforcing fibers is good, but in the case of Comparative Example 15, in which the order of addition of bentonite was changed, the dispersibility was poor. The reinforcing effect also deteriorated, and the surface properties of the F product were also poor.

Claims (1)

[Scope of Claims] (1) Bentonite is 2 to 2% of the solid content of papermaking slurry
10% by weight (hereinafter, weight% based on the solid content of papermaking slurry unless otherwise specified), pulp 1 to 8%, reinforcing fiber 0
．． 5-5%, 0 natural and/or man-made fibrous minerals
．． Claim 1: Hydraulic inorganic paper product consisting of 5 to 10% coagulant, 50 to 500 ppm (to hydraulic inorganic material), and the remainder mainly consisting of hydraulic inorganic material (2) The swelling degree of bentonite is 2 to 10. Hydraulic inorganic paper product (3) according to the patent claim, wherein the reinforcing fiber has a fineness of 0.1 to 20 denier, an aspect ratio of 200 to 900, a tensile strength of 5 g/denier or more, and a Young's modulus of 90 g/denier or more. Hydraulic inorganic paper product according to claims 1 to 2 (4) The hydraulic inorganic paper product according to claims 1 to 3, wherein the reinforcing fibers are polyvinyl alcohol-based and polyacrylonitrile-based fibers ( 5) Hydraulic inorganic paper products according to claims 1 to 4, wherein the natural and/or artificial fibrous inorganic material has a diameter of 3 to 15 μm (in yen terms) and a length of 0.1 to 10 mm ( 6) Canadian freeness of pipe is 30-750
ml. Hydraulic inorganic paper product (7) according to claims 1 to 5, by adding 2 to 10% bentonite to a 1 to 8% pulp aqueous dispersion, or adding 2 to 10% bentonite to a bentonite dispersion. 0.5 to 5% to the aqueous dispersion that is stirred and dispersed by adding pulp.
reinforcing fibers, natural and/or artificial fibrous inorganic substances 0
．． 5 to 10% of the paper-making slurry, which is obtained by adding the remainder mainly of hydraulic inorganic materials to a dispersion liquid that has been stirred and dispersed.
A wet paper-making method for hydraulic inorganic products, characterized in that paper-making is carried out while adding a coagulant of ~500 ppm (to hydraulic inorganic substances) (8) The degree of swelling of bentonite is 2 to 10.Claim 7 Wet papermaking method for hydraulic inorganic products as described (9) The reinforcing fiber has a fineness of 0.1 to 20 denier, an aspect ratio of 200 to 900, a tensile strength of 5 g/denier or more, and a Young's modulus of 90 g/denier or more. Wet paper-making method for hydraulic inorganic products according to claims 7 to 8 (10) Water according to claims 7 to 9, wherein the reinforcing fibers are polyvinyl alcohol-based and polyacrylonitrile-based fibers Wet papermaking method for hard inorganic products (11) Hydraulic inorganic material according to claims 7 to 10, wherein the natural and/or artificial fibrous inorganic material has a diameter of 3 to 15 μm and a length of 0.1 to 10 mm. Product wet papermaking method (12) Canadian freeness of pulp is 30-75
0ml wet papermaking method for hydraulic inorganic products according to claims 7 to 11.