JP2009084409A - Nonflammable sheet or nonflammable molded body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonflammable sheet or a nonflammable molded body having a high degree of nonflammability, and low density, and being excellently lightweight. <P>SOLUTION: In the nonflammable sheet obtained by adding a coagulant to a raw slurry and wet sheet making the raw slurry in the coagulated state, or in the nonflammable molded body produced by heating and molding the nonflammable sheet under pressure, the problem is solved by using the nonflammable sheet or the nonflammable molded body which are characterized by including only an iron slag, combination of the iron slag and calcium silicate, that of the iron slag, calcium silicate, and an inorganic compound hydrate, or that of the iron slag and the inorganic compound hydrate of 30-90 mass% of the solid content, cellulose fiber of 0.4-20 mass% of the solid content, inorganic fiber with a quantity of which the summed quantity of the cellulose fiber and the inorganic fiber is 3-40 mass% of the solid content, sepiolite of 5-40 mass% of the solid content, and a synthetic polymer of 1-20 mass% of the solid content in terms of total mass of the solid content of the raw slurry. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a non-combustible sheet or a non-combustible molded article, and more particularly to a non-combustible sheet or a non-combustible molded article having high non-combustibility and low density and excellent lightness.

  Conventionally, a base material containing a large amount of aluminum hydroxide powder has been used as a non-combustible building material for imparting non-combustibility to various building materials for fire prevention measures of buildings. The base material containing a large amount of the aluminum hydroxide powder is incombustible by dehydration endothermic reaction of aluminum hydroxide at 200 to 300 ° C.

  However, a substrate containing a large amount of a water-containing inorganic compound such as aluminum hydroxide generally has a drawback that its strength is extremely weak. Several proposals have been made so far to solve such difficulties.

For example, in Patent Document 1, the amount of a synthetic polymer that can be contained due to the effect of improving the incombustibility by combining a hydrous inorganic compound and a carbonate in a specific blending ratio is increased, and the strength of the incombustible substrate is improved. This technique is disclosed. However, there is an even stronger demand for performance improvement in such fields, and increasing the amount of water-containing inorganic compound and carbonate to ensure a higher degree of non-flammability increases the density of the non-flammable base material. When compared with the same thickness, the non-combustible base material is increased in weight, and deterioration in handling workability during processing or construction is inevitable.
JP-A-5-112659

  The present invention has been made in view of the above points, and provides a non-combustible sheet or a non-combustible molded article having high non-combustibility, low density and excellent lightness.

The non-combustible sheet or non-combustible molded product according to the present invention is a non-combustible sheet obtained by adding a flocculant to a raw material slurry and performing wet papermaking in a coagulated state, or a non-combustible molded product obtained by hot-pressing the non-combustible sheet. Based on the total solid content of steel, only steel slag, a combination of steel slag and calcium silicate, a combination of steel slag, calcium silicate and water-containing inorganic compound, a combination of steel slag and calcium silicate, or steel slag 30 to 90% by mass (solid content) of cellulose and water-containing inorganic compound, 0.4 to 20% by mass (solid content) of cellulose fibers, and 3 to 40% by mass (solid content) of the cellulose fibers and inorganic fibers ) In an amount of inorganic fibers, 5 to 40% by mass (solid content) of sepiolite, and 1 to 20% by mass (solid content) of a synthetic polymer.
In one advantageous embodiment of the present invention, sepiolite is a standard disintegrator as defined in JIS P 8220: 1998, using 20 ° C. tap water, a liquid volume of 1500 ml, a concentration of 3% by mass, and a shaft rotational speed of 30000. The viscosity measured at a liquid temperature of 25 ° C., an inner cylinder rotation speed of 6 rotations / minute, and an inner cylinder rotation time of 1 minute using an inner cylinder rotation type viscometer is 200 mPa · s or less. is there.

  The non-combustible sheet or non-combustible molded body of the present invention comprises only steel slag, a combination of steel slag and calcium silicate, a combination of steel slag, calcium silicate and a water-containing inorganic compound, a combination of steel slag and calcium silicate, or Contains a predetermined amount of a combination of steel slag and a water-containing inorganic compound (hereinafter also referred to as the steel slag), sepiolite, and a synthetic polymer, and further includes a predetermined amount of cellulose fibers or cellulose fibers and inorganic fibers. Add the flocculant to the raw material slurry and wet paper making in the agglomerated state, or hot press forming the resulting paper sheet, in the sheet or molded body, only the steel slag, based on the total solid content of the raw material slurry A combination of steel slag and calcium silicate, a combination of steel slag, calcium silicate and water-containing inorganic compound, steel slag and Combination of calcium acid or steel slag and water-containing inorganic compound 30 to 90% by mass (solid content), cellulose fiber 0.4 to 20% by mass (solid content), cellulose fiber and inorganic fiber The total amount of inorganic fibers is 3 to 40% by mass (solid content), 5 to 40% by mass (solid content) of sepiolite and 1 to 20% by mass (solid content) of synthetic polymer. Incombustibility, low density and excellent light weight. Sepiolite was treated with a standard disaggregator specified in JIS P 8220: 1998, using tap water at 20 ° C. with a liquid volume of 1500 ml, a concentration of 3% by mass, and a shaft rotation speed of 30000 times, and then an inner cylinder rotation type It has also been found that the papermaking property can be improved when the viscosity measured at a liquid temperature of 25 ° C., an inner cylinder rotation speed of 6 rotations / minute, and an inner cylinder rotation time of 1 minute using a viscometer is 200 mPa · s or less. Yes. That is, the non-combustible sheet or non-combustible molded article of the present invention can suppress the total calorific value of the exothermic test by a cone calorimeter in accordance with ISO 5660 part 1: 1993, and is a requirement for non-combustible materials specified in the Building Standard Law. It has high incombustibility that can pass the standard, and since it has a low density, it can be reduced in weight when compared with the same thickness, ensuring good handling workability during processing or construction. Has the advantage.

The steel slag used in the present invention is generated as a by-product in the steel manufacturing process, and includes a blast furnace slag generated in the blast furnace process and a steelmaking slag generated in the steel making process. Steel slag is mainly composed of calcium oxide (CaO) and silicon dioxide (SiO ₂ ) for both blast furnace slag and steelmaking slag, and any of them may be used, but those processed into powder or fiber are preferred. Blast furnace slag fine powder is suitable.
Calcium silicate used in the present invention is a kind of silicate and is a compound having a composition in which calcium oxide and silicon dioxide are combined. There are mainly wollastonite, which is a natural product, and zonotolite, tobermorite, which are mainly synthetic products. Wollastonite is indicated by CaSiO ₃ or CaO · SiO ₂ , zonotolite is indicated by 6CaO · 6SiO ₂ · H ₂ O, and tobermorite is indicated by 5CaO · 6SiO ₂ · 5H ₂ O. Commercially available calcium silicate may contain a small amount of aluminum oxide (Al ₂ O ₃ ), iron oxide (Fe ₂ O ₃ ) and the like in addition to this chemical formula.

Examples of the water-containing inorganic compound include aluminum hydroxide, magnesium hydroxide, calcium hydroxide, dihydrate gypsum, calcium aluminate (xCaO · Al ₂ O ₃ · yH ₂ O; x = 1 to 4, y = 5 to 5). 19). These compounds all have crystal water in the molecule and have a chemically similar structure. In addition, the hydrous inorganic compounds have some differences in decomposition temperature and endothermic amount depending on the type, but they are quite common in that they decompose upon high temperature heating and exhibit a flame retardant effect by endothermic action. Therefore, basically any of the above-mentioned water-containing inorganic compounds may be used, but aluminum hydroxide is optimal in view of economics such as an acquisition price.

Only the steel slag in the incombustible sheet or non-combustible molded product according to the present invention, a combination of steel slag and calcium silicate, a combination of steel slag, calcium silicate and a water-containing inorganic compound, a combination of steel slag and calcium silicate, Or the content rate range of the combination of steel slag and a water-containing inorganic compound is 30-90 mass% in solid content on the basis of the solid content total mass of a raw material slurry. Preferably it is 35-85 mass%, More preferably, it is 40-80 mass%. If the content is less than 30% by mass, sufficient incombustibility cannot be obtained. On the contrary, when it exceeds 90 mass%, sufficient papermaking property or mechanical strength cannot be obtained due to an excess of steel slag, or steel slag and calcium silicate and / or a water-containing inorganic compound, which is unsuitable.
In addition, it becomes easy to ensure sufficient incombustibility and papermaking property or mechanical strength by making the steel slag etc. in the incombustible sheet or the incombustible molded product in a solid content range of 35 to 85% by mass, and 40 to 80 mass. By setting it as the range of%, it becomes easy to ensure sufficient nonflammability and papermaking property or mechanical strength.
Furthermore, when using calcium silicate and / or water-containing inorganic compound in addition to steel slag, there is no particular limitation on the amount of calcium silicate and / or water-containing inorganic compound, but depending on the application, particularly low density and light weight. When paying attention, increasing the amount of steel slag, steel slag and calcium silicate and reducing the amount of water-containing inorganic compound relatively reduces the low density and lightness of the incombustible sheet or incombustible molded article to be produced. I know it ’s outstanding. Therefore, when calcium silicate and / or a water-containing inorganic compound are used in addition to steel slag, the water-containing inorganic is based on the total mass of the solid content of the raw slurry, especially for applications where low density and light weight are important. The amount of the compound is advantageously 60% by mass (solid content) or less, particularly 55% by mass (solid content) or less.

  As the above-mentioned cellulose fiber, one or two or more types selected from wood pulp or cotton pulp, hemp pulp, various waste papers such as softwood or hardwood chemical pulp, mechanical pulp, semi-chemical pulp, etc. are used in combination. May be. Wood pulp is the most easy-to-use cellulose fiber material because of its stable supply and quality and relatively low price. Cotton pulp and hemp pulp are unstable in supply and expensive in price, as in the present invention, such as calcium silicate, hydrous inorganic compound and sepiolite, or calcium silicate, hydrous inorganic compound, sepiolite and inorganic fiber. In the non-combustible sheet or non-combustible molded article containing a large amount of inorganic compounds, the decrease in the mechanical strength of the non-combustible sheet or non-combustible molded article can be minimized by using the cotton pulp or hemp pulp as necessary. it can.

  The content range of the cellulose fiber in the incombustible sheet or the incombustible molded article according to the present invention is 0.4 to 20% by mass, preferably 0.6 to 18% by mass, based on the total mass of the solid content of the raw slurry. %, More preferably 0.8 to 15% by mass. If the content is less than 0.4% by mass, sufficient papermaking property cannot be obtained due to the shortage of cellulose fibers, and the mechanical strength becomes insufficient. On the other hand, if it exceeds 20% by mass, sufficient nonflammability cannot be obtained due to an excess of organic substances. However, by making the content of the cellulose fibers in the non-combustible sheet or non-combustible molded article in the range of 0.6 to 18% by mass in solid content, it becomes easy to ensure sufficient papermaking, mechanical strength and non-combustibility, By setting it as the range of 0.8-15 mass%, it becomes easy to ensure sufficient papermaking property, mechanical strength, and nonflammability.

  As the above-mentioned inorganic fiber, at least one kind selected from rock wool fiber, glass fiber, ceramic fiber or carbon fiber is used.

  The total content range of the cellulose fiber and the inorganic fiber in the incombustible sheet or incombustible molded article of the present invention is 3 to 40% by mass, preferably 3 to 35% by mass, based on the total mass of the solid content of the raw slurry. More preferably, it is 3-30 mass%. When the total content is less than 3% by mass, sufficient paper-making property cannot be obtained due to an insufficient amount of fiber, and inorganic fibers are also insufficient, so that sufficient incombustibility is hardly obtained. Further, when the total content exceeds 40% by mass, the inorganic fibers are excessive and sufficient papermaking properties cannot be obtained. In addition, it is sufficient nonflammability by making the total content rate of the cellulose fiber and inorganic fiber in a nonflammable sheet or a nonflammable molded object into the range of 3-35 mass% by solid content on the basis of the solid content total mass of raw material slurry. It becomes easy to ensure property and papermaking property, and it becomes easy to ensure sufficient nonflammability and papermaking property by setting it as the range of 3-30 mass%.

  When the content rate of the cellulose fiber in the incombustible sheet or the incombustible molded article of the present invention is 3 to 20% by mass, the inorganic fiber is not necessarily contained, and the content rate of the inorganic fiber may be 0% by mass.

Sepiolite used in the present invention is a hydrous magnesium silicate which is a kind of clay mineral and has an ideal chemical structural formula of Mg ₈ Si ₁₂ O ₃₀ (OH) ₄ (OH ₂ ) ₄ · 6 to 8H ₂ O. Can show. In this chemical structural formula, (OH) ₄ is crystal water, (OH ₂ ) ₄ is bound water, and 6-8H ₂ O is adsorbed water. In addition to this chemical formula, commercially available sepiolite has a small amount of aluminum oxide (Al ₂ O ₃ ), iron oxide (Fe ₂ O ₃ ), calcium oxide (CaO), potassium oxide (K ₂ O), sodium oxide (Na ₂ ). O) and the like. Sepiolite generally has adsorptive properties, thickening properties, thixotropic properties, caking properties, and sinterability.

  The content range of sepiolite in the incombustible sheet or incombustible molded article of the present invention is 5 to 40% by mass, preferably 7 to 35% by mass, more preferably 8 based on the total mass of the solid content of the raw slurry. It is -32 mass%. When the content is less than 5% by mass, a sufficiently low density cannot be obtained. When the content exceeds 40% by mass, the water content after netting is too high, and sufficient papermaking properties cannot be obtained. However, by setting the content of sepiolite in the non-combustible sheet or non-combustible molded product in the range of 7 to 35% by mass in terms of solid content, it becomes easy to ensure sufficient low density and papermaking, and in the range of 8 to 32% by mass. By doing so, it becomes easy to ensure sufficient low density and papermaking.

  In a standard disintegrator specified in JIS P 8220: 1998, after processing at a liquid volume of 1500 ml, a concentration of 3% by mass, and a shaft rotational speed of 30000 times using 20 ° C. tap water, The viscosity measured at a liquid temperature of 25 ° C., the inner cylinder rotation speed of 6 rotations / minute, and the inner cylinder rotation time of 1 minute (hereinafter, this viscosity measurement method may be abbreviated as “the viscosity measurement method”). ) Is 200 mPa · s or less, preferably 150 mPa · s or less, more preferably 120 mPa · s or less, and it has been demonstrated that sepiolite is advantageous for papermaking. If the viscosity measured by the viscosity measurement method exceeds 200 mPa · s, the water content after net dewatering becomes too high and sufficient papermaking properties cannot be obtained. In addition, by setting the viscosity according to the viscosity measuring method to 150 mPa · s or less, the water content after the papermaking dewatering can be lowered, and sufficient papermaking properties can be easily secured. In addition, by setting the viscosity measured by the viscosity measurement method to 120 mPa · s or less, the water content after papermaking dehydration can be further reduced, and at the same time, sufficient papermaking properties can be easily secured.

  The synthetic polymer used in the present invention is a thermosetting resin (including fibrous materials) such as a phenol resin, a melamine resin, an epoxy resin, a urea resin, an unsaturated polyester resin, a dup resin, a polyolefin resin, or a polyester resin. At least one selected from thermoplastic resins (including fibrous ones) such as acrylic resin, methacrylic resin, vinyl chloride resin and vinyl acetate resin, or synthetic rubbers such as SBR, NBR and MBR To do. These synthetic polymers have some differences in curing temperature, melt softening temperature, etc. depending on the type, but various molding shaping to the sheet or molded body by the flow curing action or softening melting, re-solidification action accompanying heat treatment. This is quite common in that it provides effects or effects of various strengths, or prevents the steel slag from falling off. Therefore, basically, any of the above synthetic polymers may be used, but in consideration of economics such as an acquisition price, phenol resin, polyolefin resin, SBR and the like are optimal.

The content range of the synthetic polymer in the incombustible sheet or the incombustible molded article of the present invention is 1 to 20% by mass, preferably 2 to 17% by mass, more preferably solid content, based on the total mass of the solid content of the raw slurry. Is 3 to 15% by mass. If the content is less than 1% by mass, sufficient mechanical strength or molding shaping effect or the effect of preventing the steel slag from falling off cannot be obtained. If the content exceeds 20% by mass, sufficient non-combustibility is caused by excessive organic substances. I can't get sex. However, by setting the content of the synthetic polymer in the incombustible sheet or incombustible molded body to a range of 2 to 17% by mass in terms of solid content, sufficient mechanical strength or molding shaping effect or prevention of falling off of the steel slag, etc. It becomes easy to ensure the effect and incombustibility, and by setting it in the range of 3 to 15% by mass, the mechanical strength or molding shaping effect or the steel slag and the like is prevented from falling off and incombustibility. It becomes easy.
The basis weight of the incombustible sheet or incombustible molded article of the present invention is not particularly limited, but when the incombustible sheet or incombustible molded article of the present invention is applied as a main constituent material such as a wall material or a ceiling material, the basis weight is 500 g / m ² or more is preferable, 800 g / m ² or more is more preferable, and 1000 g / m ² or more is more preferable. By setting the basis weight to 500 g / m ² or more, it becomes easy to ensure sufficient mechanical strength, and by setting the basis weight to 800 g / m ² or more, it becomes easier to ensure sufficient mechanical strength, and 1000 g / m ^2. By setting it as the above, it becomes easy to ensure sufficient mechanical strength.

  The non-combustible sheet or non-combustible molded product according to the present invention contains cellulose fiber, sepiolite, and synthetic polymer such as the steel slag, or the steel slag, cellulose fiber, inorganic fiber, sepiolite, based on the above formulation. And preparing a raw material slurry containing a specific amount of each component in a configuration containing a synthetic polymer, adding a flocculant to the slurry, wet-making in an agglomerated state, and hot pressing if necessary can get. Next, further detailed description will be made with reference to the production method.

  As the flocculant added to the raw material slurry according to the present invention, as long as it expresses a function of fixing the steel slag, etc. in the raw material slurry, and sepiolite to cellulose fibers, etc. by the cross-linking adsorption action or the like, the kind thereof is used. There is no particular limitation, and any of polyacrylamide, polyacrylic acid soda, polyamine, polymethacrylate, dicyandiamide, polyethyleneimine, chitosan, cationic starch, and the like can be used. In addition, it goes without saying that the amount of the flocculant to be added should be determined appropriately depending on the type of the flocculant, but in the case of the present invention, sepiolite in the raw slurry and the steel slag, etc., particularly sepiolite is firmly fixed to the cellulose fiber. In order to make it cause, it is preferable to add about 0.005-0.5 mass part of said flocculant by solid content with respect to 100 mass parts of total solid content in raw material slurry.

  Furthermore, in the raw material slurry, steel slag, or steel slag and calcium silicate and / or water-containing inorganic compound and various yield improvers for improving the yield of sepiolite, or fillers such as talc and calcium carbonate as required. Synthetic dyes and pigments for coloring may be included. In addition, it goes without saying that a dry or wet paper strength enhancer, a sizing agent, a water-proofing agent, a water-repellent agent, etc. should be included in order to improve mechanical strength or post-processability depending on the application.

  As a method of incorporating the synthetic polymer into the incombustible sheet or the incombustible molded article of the present invention, a synthetic polymer liquid, fibrous material or granular material is internally added to the raw material, or coated or formed after the paper layer is formed. It may be impregnated. However, in order to make the quality uniform in the thickness direction, a method of internally adding a liquid, fibrous or granular material of a synthetic polymer to the raw slurry is most preferable.

  As a method of incorporating the steel slag and the like, a method of applying or impregnating a base material with a paint containing the steel slag or the like is also conceivable, but ensuring a predetermined content or quality in the thickness direction. In order to achieve uniformization, the method of internally adding the steel slag or the like into the raw material slurry in solid or slurry form is most preferable.

  In this case, methods for adding steel slag, calcium silicate, hydrous inorganic compound, cellulose fiber, inorganic fiber, sepiolite and synthetic polymer, the order of addition, etc. are arbitrary, and beating treatment may be performed as necessary.

  In order to perform wet papermaking using the raw material slurry thus obtained, a normal papermaking method may be used. That is, the raw material slurry may be supplied onto a papermaking net such as a long net, a circular net, or an inclined net, filtered, dehydrated, and then compressed and dried. If necessary, two or more sheet layers may be overlapped by various combination nets, multi-circular nets, various laminators, and the like.

  As for the hot pressing, conventional hot pressing press molding, preheating-cold press molding, high-frequency heating molding, or the like may be applied singly or in combination of two or more.

  The incombustible sheet or incombustible molded body of the present invention contains the steel slag and the like and sepiolite, or exhibits excellent incombustibility only by containing the inorganic fiber and sepiolite, such as the steel slag. This does not prevent the use of flame retardants. Examples of flame retardants that can be used in combination include known flame retardants such as organic phosphorus compounds, phosphorus-containing nitrogen-containing compounds, sulfamates such as guanidine sulfamate, inorganic phosphates, halogen-containing compounds, and antimony compounds. . Examples of the method of using the flame retardant include a method in which one or more known flame retardants are internally added to the raw material slurry, or are applied or impregnated during the paper making process, after paper making, or after hot pressing. It is done. In general, however, flame retardants should not be preferably used because they have the disadvantage that they tend to generate harmful gases when heated at high temperatures. When using a flame retardant, it is natural that the content of the flame retardant should be minimized in consideration of the content of the steel slag and the sepiolite or the content of inorganic fibers and sepiolite such as the steel slag. .

  Furthermore, depending on the application, the obtained incombustible sheet or incombustible molded body may be subjected to surface treatment such as spraying, application or printing of various paints, decorative paper, leather, synthetic resin film, veneer, metal plate or metal foil, etc. Needless to say, it is possible to further increase the added value of the non-combustible sheet or the non-combustible molded article by adhering and fixing the face material.

  An important point in the configuration of the non-combustible sheet or non-combustible molded article of the present invention is that it contains a predetermined amount of sepiolite, particularly sepiolite whose viscosity by the viscosity measurement method is in a specific range, and contains a large amount of the steel slag and the like. In addition, a predetermined amount of cellulose fiber and synthetic polymer or a predetermined amount of cellulose fiber, inorganic fiber and synthetic polymer are contained. As a result, the non-combustible sheet or non-combustible molded product of the present invention can suppress the total calorific value of the exothermic test by a cone calorimeter in accordance with ISO 5660 part 1: 1993, and the requirements for the non-combustible material specified in the Building Standard Law It exhibits a high degree of nonflammability that can be passed, and also has the effect of being low in density and excellent in lightness.

  Non-flammable base materials that have high levels of nonflammability by adding a large amount of calcium silicate or calcium silicate and water-containing inorganic compounds in wet papermaking have high density, and are nonflammable when compared at the same thickness. The weight of the base material is increased, and deterioration in handling workability during processing or construction is inevitable. Therefore, it has been extremely difficult to achieve both high incombustibility and low density.

Therefore, in order to obtain a low density in a non-combustible sheet or a non-combustible molded article containing a large amount of the steel slag and the like, and additionally containing cellulose fibers and synthetic polymers or cellulose fibers, inorganic fibers and synthetic polymers, When an experiment was conducted, this object was achieved by using a predetermined amount of sepiolite, particularly a predetermined amount of sepiolite whose viscosity when dispersed in water was in a specific range, and specifying the content of each component. I found that I can do it. As sepiolite, after treating with a standard disintegrator specified in JIS P 8220: 1998, using tap water at 20 ° C. with a liquid volume of 1500 ml, a concentration of 3% by mass and a shaft rotation speed of 30000 times, the inner cylinder rotation type When using a viscometer with a viscosity measured at a liquid temperature of 25 ° C., an inner cylinder rotation speed of 6 rotations / minute, and an inner cylinder rotation time of 1 minute, of 200 mPa · s or less, the steel slag, etc. Containing a predetermined amount of sepiolite and synthetic polymer, and further adding a flocculant to a raw material slurry containing a predetermined amount of cellulose fibers or cellulose fibers and inorganic fibers, and can easily and well form paper in wet state. Alternatively, the obtained paper sheet is hot-press molded, and the steel slag and the like are added to the sheet or molded body in the amount of 30 to 90% by mass (solid content) based on the total solid content of the raw material slurry. 0.4 to 20% by mass (solid content) of loin fiber, 3 to 40% by mass (solid content) of cellulose fiber and inorganic fiber, 5 to 40% by mass (solid content) of sepiolite, and 1 synthetic polymer By containing ˜20% by mass (solid content), the total calorific value of the exothermic test by the cone calorimeter according to ISO 5660 part 1: 1993 can be kept small, and the incombustible material specified in the Building Standard Law It has been found that it has high incombustibility that can pass the requirements, is low in density, is light in weight, and is suitable for the purpose of ensuring good handling workability during processing or construction.
Example:
The present invention will be described in more detail based on the following examples, but the present invention is not limited thereto.

The measurement of each item in a present Example and a comparative example was based on the following method.
(1) Agglomerated state of raw material slurry: When paper making, the raw material slurry in the cylinder of the square test paper machine or the stock inlet of the paperboard paper machine is visually observed. The case where no was exhibited was set as x. (Here, the paperboard machine is a paper laminate that winds up the sheet layer a number of times until it reaches the intended thickness on the roll, and cuts it in the width direction of the roll. (This refers to a device that squeezes and dries a sheet with a roll width and length equal to the roll circumference.)
(2) Moisture content after net paper dewatering: The wet sheet on the paper net after paper net dewatering was sampled, and the moisture content of the wet sheet was measured immediately after sampling by the absolutely dry method, From the dry mass measured by drying the wet sheet to a constant weight sufficiently with a 110 ° C. hot air dryer,
((Wet sheet mass−absolute dry mass) / absolute dry mass) × 100%
I asked for it.
(3) Papermaking property: In the case of papermaking by the square test paper machine, due to insufficient dewatering in the papermaking net and excessive moisture content of the wet sheet on the papermaking net after the papermaking dewatering in the process of dewatering and squeezing in the papermaking net. When there are no problems such as difficulty in separating the wet sheet from the net (the wet sheet is too weak and collapses due to excessive moisture content), and the wet sheet collapses due to excessive moisture content in the wet sheet. Insufficient dewatering in the net, and difficulty in separating the wet sheet from the net due to excessive moisture content of the wet sheet on the net after dewatering (the wet sheet is too weak and collapses due to excessive moisture content). The case where at least one defect such as collapse of the wet sheet during pressing due to excessive moisture content of the wet sheet occurred was evaluated as x. Also, in the case of paper making by a wind-up paperboard machine, in the process of dewatering with a paper net, winding / lamination / peeling and winding on a windup roll, and under the dewatering of the paper net, Difficult to separate the wet sheet from the net due to excessive moisture content of the wet sheet, defective when winding, laminating and peeling on the windup roll (difficult to wind due to excessive moisture content or the wet sheet is too weak to collapse ), When there are no problems such as collapse of the wet sheet during squeezing, it is marked with ○. Difficulty in separating wet sheets, defects when winding / lamination / peeling on windup rolls (difficult to wind due to excessive moisture content or wet sheet is too weak and collapses), collapse of wet sheet during compression, etc. At least one defect When the was no was ×.
(4) Thickness and density: Conforms to JIS P 8118: 1998.
(5) Basis weight: Based on JIS P 8124: 1998.
(6) Bending strength: According to JIS A 5905: 1994. When there was fiber orientation, it measured about the fiber orientation direction and the direction which makes a right angle to this, and calculated | required the average of both.
(7) Viscosity of sepiolite: measured using an inner cylinder rotational viscometer at a liquid temperature of 25 ° C., an inner cylinder rotation speed of 6 rotations / minute, and an inner cylinder rotation time of 1 minute. The liquid to be measured is a standard disintegrator specified in JIS P 8220: 1998, using tap water at 20 ° C., a liquid volume of 1500 ml, a concentration of 3% by mass,
It was prepared by processing at 30000 shaft rotations.
The inner cylinder rotary viscometer used is a B type viscometer (model: BM type) manufactured by Toki Sangyo Co., Ltd., and 230 mL of the liquid to be measured is placed in a glass beaker having an inner diameter of 56 mm and a depth of 110 mm. No. corresponding to the cylinder. Measurement was performed using one rotor (diameter 19 mm, height 65 mm) without using a rotor guard. The measurement value of the viscosity by this measurement has an error of less than 10% compared to the true value when the liquid to be measured spreads infinitely.
(8) Nonflammability: It evaluated by the total calorific value of the exothermic test (heating intensity; 50 kW / m < ² >, overheating time; 20 minutes) by the corn calorimeter based on ISO 5660 part 1: 1993.
(9) Nonflammability 2: Evaluated by pass / fail with respect to the requirements for nonflammable materials in Article 2-9 of the Building Standards Act and Article 108-2 of the Enforcement Ordinance of the same law. That is,
Total calorific value: Applicable when the total calorific value does not exceed 8 MJ / m ² in the exothermic test of Nonflammability 1.
Cracks and holes: Applicable when there are no cracks or holes penetrating to the back side, which is harmful to fire prevention, in the exothermic test of Nonflammability 1.
Maximum heat generation rate: Applicable when the maximum heat generation rate does not exceed 200 kW / m ² for more than 10 seconds in a nonflammability 1 exothermic test.
Non-combustible material pass / fail: Pass if the total calorific value, cracks and holes, and maximum heat generation rate are all appropriate. If even one of them does not fit, it will be rejected.

Location of mixed dispersion of cellulose fiber and inorganic fiber obtained by disaggregating commercially available softwood unbleached sulfate pulp and rock wool fiber having a fiber length of 3 mm (hereinafter abbreviated as “inorganic fiber a”) with a disaggregator. An aluminum hydroxide powder (average particle size is 5.7 μm, the same applies hereinafter), blast furnace slag (average particle size by wet laser diffraction / scattering method is about 6 μm, and ratio by Blaine air permeation method is taken. Surface area is 7910 cm ² / g; hereinafter abbreviated as steel slag a), powdery phenol resin (average particle diameter is 30 μm, the same applies hereinafter), and sepiolite having a viscosity of 51 mPa · s by the viscosity measuring method. (Powder having an average particle size of 92 μm by a dry laser diffraction method before dispersion treatment; hereinafter abbreviated as sepiolite a) is added and sufficiently dispersed and mixed with a stirrer to produce a raw material slurry. - Next, 0.01 parts by mass of a weak anionic polyacrylamide-based flocculant is added to 100 parts by mass of the total solid content of the raw slurry, and paper is made in a coagulated state using a square test paper machine. The sheet A was obtained by squeezing and drying (substantially completely dry, with a moisture content of 1% by mass or less), and then sufficiently adjusting the humidity at 23 ° C. and a relative humidity of 50%.

  For sheet A, the solid content of each component is shown in Table 1 in mass%, and the aggregated state of the raw slurry, the moisture content after netting dewatering, papermaking properties, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.

  In Example 1, sepiolite a in place of sepiolite a and sepiolite having a viscosity of 326 mPa · s according to the viscosity measuring method of the present invention (powder having an average particle size of 56 μm by dry laser diffraction before dispersion treatment; hereinafter sepiolite) abbreviated as b)) at a solid mass ratio of sepiolite a / sepiolite b = 2/1 (the viscosity of the mixture of sepiolite a / sepiolite b = 2/1 by the viscosity measuring method according to the present invention is 107 mPa · ) and sheet B was obtained in the same manner as in Example 1 except that no aluminum hydroxide powder was blended.

  For sheet B, the solids content of each component is shown in Table 1 in mass%, and the aggregated state of the raw slurry, the moisture content after netting dewatering, papermaking properties, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.

In Example 1, instead of steel slag a, blast furnace slag (average particle size by wet laser diffraction / scattering method is about 9 μm, specific surface area by brane air permeation method is 6190 cm ² / g; hereinafter steel slag b The sheet C was obtained in the same manner as in Example 1 except that this was used.

  For sheet C, the solid content of each component is shown in Table 1 in mass%, and the aggregated state of the raw slurry, the water content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.

  In Example 1, glass fibers having a fiber length of 3 mm (hereinafter abbreviated as “inorganic fibers b”) were used in place of the inorganic fibers a, and magnesium hydroxide powder (with an average particle size of 10 μm) was used instead of the aluminum hydroxide powder. A sheet D was obtained in the same manner as in Example 1 except that a fibrous polyolefin resin (a commercially available polyethylene synthetic pulp. The same applies hereinafter) was used instead of the powdery phenol resin. It was.

  For sheet D, the solid content of each component is shown in Table 1 in mass%, and the aggregated state of the raw slurry, the moisture content after netting dewatering, papermaking properties, thickness, density, basis weight, bending strength, nonflammability The properties 1 and 2 were measured, and the results are shown in Table 1.

In Example 1, instead of blast furnace slag a, blast furnace slag (average particle diameter by wet laser diffraction / scattering method is about 15 μm, specific surface area by brane air permeation method is 3890 cm ² / g; hereinafter, steel slag c The sheet E was obtained in the same manner as in Example 1 except that a commercially available SBR latex was used instead of the powdery phenol resin and the inorganic fiber a was not blended.

  For the sheet-like molded product E, the solid content of each component is shown in mass% in Table 1, and the aggregation state of the raw material slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending The strength, nonflammability 1 and nonflammability 2 were measured, and the results are shown in Table 1.

  In Example 1, instead of sepiolite a, sepiolite (powder before dispersion treatment; hereinafter abbreviated as sepiolite c) having a viscosity of 22 mPa · s according to the viscosity measuring method according to the present invention was used, and aluminum hydroxide powder was used. Example 1 except that wollastonite (median diameter by wet laser diffraction / scattering method is 37 μm and average aspect ratio is 7; hereinafter abbreviated as calcium silicate a) is used instead of the body. Thus, a sheet F was obtained.

  Regarding the sheet F, the solid content of each component is shown in mass% in Table 1, and the agglomeration state of the raw slurry, the water content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.

  Example 1 is the same as Example 1 except that zonotlite (average particle size by Coulter counter method is 9.5 μm and average aspect ratio is 15; hereinafter abbreviated as calcium silicate b) is used. Thus, a sheet G was obtained.

  Regarding the sheet G, the solid content of each component is shown in mass% in Table 1, and the aggregated state of the raw slurry, the moisture content after dewatering, the papermaking property, the thickness, the density, the basis weight, the bending strength, and the incombustibility. The properties 1 and 2 were measured, and the results are shown in Table 1.

  Dissolve commercially available softwood unbleached sulfate pulp and inorganic fiber a with a pulper, add aluminum hydroxide powder, blast furnace slag a, powdered phenol resin and sepiolite a, and thoroughly disperse and mix. The raw material slurry was obtained. Next, 0.1 parts by mass of a weak anionic polyacrylamide-based flocculant is added to the total solid content of 100 parts by mass of the raw material slurry, and in the agglomerated state, a roll having a long net / windup roll configuration is added. 20 sheet layers are laminated on a paperboard machine, paper-making, pressing and drying (almost completely dry, moisture 1% by mass or less), and then fully conditioned at 23 ° C and 50% relative humidity Sheet H was obtained.

  Regarding the sheet H, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the water content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.

  In Example 8, sheet I was obtained in the same manner as in Example 8 except that the number of laminated sheet layers was 14 instead of 20, and no aluminum hydroxide powder was blended.

  Regarding the sheet I, the solid content of each component is shown in Table 1 in mass%, and the aggregated state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.

  A sheet (corresponding to the sheet A) sufficiently adjusted at 23 ° C. and 50% relative humidity obtained in the same manner as in Example 1 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded product A.

  For the molded product A, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.

  A sheet (corresponding to sheet B) sufficiently adjusted at 23 ° C. and 50% relative humidity obtained in the same manner as in Example 2 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded product B.

  For molded body B, the solid content of each component is shown in Table 1 in mass%, and the aggregated state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.

  A sheet (corresponding to the sheet C) sufficiently adjusted at 23 ° C. and 50% relative humidity obtained in the same manner as in Example 3 was subjected to heat treatment (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes). ) To obtain a molded product C.

  For molded body C, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the moisture content after netting dewatering, papermaking properties, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.

A sheet (corresponding to the sheet D) sufficiently humidified at 23 ° C. and 50% relative humidity obtained in the same manner as in Example 4 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded body D.

  For the molded body D, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the water content after netting dewatering, papermaking properties, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.

  A sheet (corresponding to the sheet F) that was sufficiently conditioned at 23 ° C. and 50% relative humidity obtained in the same manner as in Example 6 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded product F.

  For the molded product F, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.

  A sheet (corresponding to sheet H) that was sufficiently conditioned at 23 ° C. and 50% relative humidity obtained in the same manner as in Example 8 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded body H.

  For the molded body H, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.

  A sheet (corresponding to sheet I) that was sufficiently conditioned at 23 ° C. and 50% relative humidity obtained in the same manner as in Example 9 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded product I.

For molded body I, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.
[Comparative Example 1]
In Example 1, a sheet J was obtained in the same manner as in Example 1 except that no sepiolite a was added.

For sheet J, the solid content of each component is shown in Table 1 in mass%, and the agglomeration state of the raw material slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.
[Comparative Example 2]
In Example 8, Sheet K was obtained in the same manner as Example 8 except that Sepiolite a was not blended.

Regarding the sheet K, the solid content of each component is shown in mass% in Table 1, and the agglomeration state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, incombustibility The properties 1 and 2 were measured, and the results are shown in Table 1.
[Comparative Example 3]
A sheet (corresponding to the sheet J) sufficiently adjusted at 23 ° C. and 50% relative humidity obtained in the same manner as in Comparative Example 1 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded product J.

For the molded product J, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the moisture content after netting dewatering, papermaking properties, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.
[Comparative Example 4]
A sheet (corresponding to sheet K) sufficiently adjusted at 23 ° C. and 50% relative humidity obtained in the same manner as in Comparative Example 2 was heat-treated with a hot press (temperature 175 ° C., pressure 2.0 MPa, time 3 minutes) ) To obtain a molded body K.

  For the molded body K, the solid content of each component is shown in Table 1 in mass%, and the aggregation state of the raw slurry, the moisture content after netting dewatering, papermaking property, thickness, density, basis weight, bending strength, Nonflammability 1 and Nonflammability 2 were measured, respectively, and the results are shown in Table 1.

  Examples 1 to 16 and Comparative Examples 1 to 4 will be described in more detail while comparing the corresponding ones.

Example 1 and Comparative Example 1 are compared. Comparative Example 1 does not contain sepiolite in Example 1, and accordingly, the content of the hydrous inorganic compound is increased. When considered in total of the hydrous inorganic compound, steel slag and sepiolite, the composition is almost the same. Have. In addition, Example 1 and Comparative Example 1 are both hot-pressed and have substantially the same sheet thickness (Example 1 is 3.67 mm, Comparative Example 1 is 3.79 mm). Moreover, both Example 1 and Comparative Example 1 have good cohesiveness and papermaking property of the raw material slurry, and the bending strength is almost the same (Example 1 is 3.1 MaP, Comparative Example 1 is 2.9 MPa). However, density, Example 1 is 0.99 g / cm ³ in Comparative Example 1 whereas a 0.84 g / cm ^3, which is approximately 18% higher. Moreover, when it sees about nonflammability, the total calorific value of the exothermic test by the corn calorimeter based on ISO 5660 part 1: 1993 is 8.6 MJ in the comparative example 1 compared with 6.4 MJ / m < ² > of Example 1. FIG. / M ² , the calorific value of Comparative Example 1 is increased by about 34%, and the nonflammability is deteriorated. As a result, although Example 1 is a pass with respect to the requirement of the nonflammable material prescribed | regulated to a building standard law, the comparative example 1 is a failure.

Next, Example 8 and Comparative Example 2 are compared. Comparative Example 2 does not contain sepiolite in Example 8, and accordingly, the content of the hydrous inorganic compound is increased. When considered in total of the hydrous inorganic compound, steel slag and sepiolite, the composition is almost the same. Have. Further, Example 8 and Comparative Example 2 are both hot-pressed and have substantially the same sheet thickness (Example 8 is 3.54 mm, Comparative Example 2 is 3.69 mm). Moreover, both Example 8 and Comparative Example 2 have good cohesiveness and papermaking property of the raw material slurry, and the bending strength is almost the same (Example 8 is 3.2 MaP, Comparative Example 2 is 3.0 MPa). However, the density is 0.87 g / cm ³ in Example 8 and 1.02 g / cm ³ in Comparative Example 2, which is about 17% higher. In terms of nonflammability, the total calorific value of the exothermic test using a cone calorimeter in accordance with ISO 5660 part 1: 1993 was 6.5 MJ / m ^{2 in} Example 8, while that in Comparative Example 2 was 8. 6 MJ / m ² , the calorific value of Comparative Example 2 increased by about 32%, and the nonflammability deteriorated. As a result, although Example 8 is a pass with respect to the requirement of the nonflammable material prescribed | regulated to a building standard law, the comparative example 2 is a failure.

Next, Example 10 and Comparative Example 3 are compared. Comparative Example 3 did not contain sepiolite in Example 10 and increased the content of the water-containing inorganic compound by that amount. When considering the sum of the water-containing inorganic compound, steel slag and sepiolite, the composition was almost the same. Have. In addition, Example 10 and Comparative Example 3 both have a hot press and have substantially the same sheet thickness (Example 10 is 3.10 mm and Comparative Example 3 is 3.18 mm). Moreover, both Example 10 and Comparative Example 3 have good cohesiveness and papermaking property of the raw material slurry, and the bending strength is almost equal (Example 10 is 6.7 MaP, Comparative Example 3 is 6.9 MPa). However, the density of Example 10 is 1.00 g / cm ³ , while that of Comparative Example 3 is 1.30 g / cm ^3, which is about 30% higher. Further, in terms of nonflammability, the total calorific value of the exothermic test using a cone calorimeter in accordance with ISO 5660 part 1: 1993 is 9.6 MJ / m ^{2 in} Example 10 and 9 in Comparative Example 3. 1 MJ / m ² , the calorific value of Comparative Example 3 increased by about 38%, and the nonflammability deteriorated. As a result, Example 10 is acceptable, but Comparative Example 3 is unacceptable for the requirements for non-combustible materials specified in the Building Standards Act.

Next, Example 15 and Comparative Example 4 are compared. Comparative Example 4 did not contain sepiolite in Example 15 and increased the content of the water-containing inorganic compound by that amount. When considered in total of the water-containing inorganic compound, steel slag and sepiolite, the composition was almost the same. Have. In addition, Example 15 and Comparative Example 4 are both hot-pressed and have substantially the same sheet thickness (Example 15 is 3.02 mm and Comparative Example 4 is 3.04 mm). Moreover, both Example 15 and Comparative Example 4 have good cohesiveness and papermaking property of the raw material slurry, and the bending strength is almost equal (Example 14 is 6.8 MaP, Comparative Example 4 is 7.3 MPa). However, the density of Example 15 is 1.02 g / cm ³ , while that of Comparative Example 4 is 1.33 g / cm ^3, which is about 30% higher. Further, in terms of nonflammability, the total calorific value of the exothermic test using a cone calorimeter based on ISO 5660 part 1: 1993 was 6.5 MJ / m ^{2 in} Example 15, while that in Comparative Example 4 was 8. 9 MJ / m ² , the calorific value of Comparative Example 4 is increased by about 37%, and the nonflammability is deteriorated. As a result, although Example 15 is a pass with respect to the requirement of the nonflammable material prescribed | regulated to a building standard law, the comparative example 4 is a failure.
The following comparative example can be used to understand the invention of claim 2:
[Comparative Example 5]
In Example 1, except that sepiolite b was used in place of sepiolite a, and the addition amount of the polyacrylamide flocculant was changed to 0.03 parts by mass instead of 0.01 parts by mass, When the paper was made with a mold test paper machine, there was insufficient dewatering in the net, and the moisture content of the wet sheet on the net after the net was dehydrated was too high. The sheet was so weak that it collapsed and a desired sheet could not be obtained.

The wet sheet on the papermaking net after the papermaking net is collected, and the content of each component is shown in Table 1, and the agglomeration state of the raw slurry, the moisture content after the papermaking dewatering, and the papermaking property are respectively shown. The results are shown in Table 1.
[Comparative Example 6]
In Example 1, instead of sepiolite a, sepiolite having a viscosity of 686 mPa · s according to the viscosity measuring method (powder having an average particle diameter of 75 μm by dry laser diffraction before dispersion treatment; hereinafter abbreviated as sepiolite d). Was used to make a paper with a square test paper machine in the same manner as in Example 1 except that the addition amount of the polyacrylamide-based flocculant was changed to 0.05 parts by mass instead of 0.01 parts by mass. The water content of the wet sheet on the papermaking net after the papermaking net dehydration is excessive, and when the wet sheet is peeled off from the netting, the wet sheet is too weak and collapses to obtain the desired sheet. I couldn't.

The wet sheet on the papermaking net after the papermaking net is collected, and the content of each component is shown in Table 1, and the agglomeration state of the raw slurry, the moisture content after the papermaking dewatering, and the papermaking property are respectively shown. The results are shown in Table 1.
[Comparative Example 7]
In Example 8, using Sepiolite b instead of Sepiolite a and adding 0.2 parts by mass of polyacrylamide flocculant instead of 0.1 parts by mass, When the paper is made with a web / windup roll paper machine, the dewatering of the net is insufficient, the moisture content of the wet sheet on the net after dewatering becomes excessive, and the wet sheet is wound up. When winding and laminating on a roll, the wet sheet was too weak and collapsed, and a desired sheet could not be obtained.

  The wet sheet on the papermaking net after the papermaking net is collected, and the content of each component is shown in Table 1, and the agglomeration state of the raw slurry, the moisture content after the papermaking dewatering, and the papermaking property are respectively shown. The results are shown in Table 1.

  Examples 1 to 16 and Comparative Examples 5 to 7 will be described in more detail while comparing the corresponding ones.

  First, Example 1 and Comparative Examples 5 and 6 are compared. They have almost the same composition, but the sepiolite used is different. In contrast to the range of 200 mPa · s or less specified in claim 2 by the viscosity measurement method, sepiolite used in Example 1 is in the range of 51 mPa · s. However, the sepiolite used in Comparative Example 5 is 326 mPa · s, which is larger than the upper limit of this range, and the sepiolite used in Comparative Example 6 is 686 mPa · s, which is even larger. Although all of Example 1 and Comparative Examples 5 and 6 have a good aggregation state of the raw material slurry, the water content after dewatering is 2.5 times higher in Comparative Example 5 than in Example 1. In Example 6, it was 3.3 times, which was extremely high. As a result, in Example 1, papermaking property was good and a desired sheet could be obtained. On the other hand, in Comparative Examples 5 and 6, the dewatering in the papermaking net was insufficient, the water content of the wet sheet on the papermaking net after the papermaking dewatering was excessive, and the wet sheet was weak when the wet sheet was peeled off from the netting. The papermaking property deteriorated until the desired sheet could not be obtained.

  Next, Example 8 and Comparative Example 7 are compared. They have almost the same composition, but the sepiolite used is different. The sepiolite used in Example 8 is in the range of 51 mPa · s, whereas the viscosity by the viscosity measurement method is 200 mPa · s or less specified in the present invention. However, the sepiolite used in Comparative Example 7 is 326 mPa · s, which is larger than the upper limit of this range. Despite the good aggregation state of the raw material slurry in both Example 8 and Comparative Example 7, the water content after dewatering was 2.9 times in Comparative Example 7 compared to Example 8 and was extremely high. became. As a result, in Example 8, papermaking property was good and a desired sheet could be obtained. On the other hand, in Comparative Example 7, the dewatering in the papermaking net is insufficient, the moisture content of the wet sheet on the papermaking net after the papermaking netting is excessive, and the wet sheet is wound when the wet sheet is wound around the windup roll and laminated. However, the papermaking property deteriorated before the desired sheet could not be obtained.

  As described above, in the incombustible sheet or the incombustible molded article of the present invention, as described in claim 1, in addition to the specific amount of the steel slag, and the cellulose fiber, or the cellulose fiber and the inorganic fiber, a specific amount of It is essential to use sepiolite. It can also be seen that it is important to select a specific viscosity of sepiolite as defined in claim 2.

Further, in Examples other than those mentioned in the comparative explanation, that is, in Examples 2 to 7, 9, 11 to 14, and 16, all of the agglomerated state and papermaking property of the raw slurry are good and conform to ISO 5660 part 1. The total calorific value of the exothermic test using the corn calorimeter is kept at a low level of 6.3 to 7.3 MJ / m ² and has a high level of non-combustibility that meets the requirements for non-combustible materials specified in the Building Standards Act. In addition, the density is 0.78 to 0.86 g / cm ³ for the product without hot press and 0.97 to 1.01 g / cm ³ for the product with hot press, which is low density and lightweight. Is excellent.

  The following can be understood from all of the above-described examples and comparative examples. That is, the non-combustible sheet or non-combustible of the present invention contains a large amount of the steel slag and the like, and additionally contains cellulose fibers and synthetic polymers or cellulose fibers, inorganic fibers and synthetic polymers, and sepiolite. The molded body has a high degree of non-combustibility that can suppress the total calorific value of the exothermic test using a cone calorimeter in accordance with ISO 5660 part 1: 1993 and can pass the requirements of non-combustible materials specified in the Building Standards Act. And since it is low density, when it compares by the same thickness, weight reduction can be achieved, and it has the advantage that favorable handling workability | operativity can be ensured at the time of processing or construction.

  As sepiolite, after treating with a standard disintegrator specified in JIS P 8220: 1998, using tap water at 20 ° C. with a liquid volume of 1500 ml, a concentration of 3% by mass and a shaft rotation speed of 30000 times, the inner cylinder rotation type Using a viscometer, the viscosity measured at a liquid temperature of 25 ° C., an inner cylinder rotation speed of 6 rotations / minute, and an inner cylinder rotation time of 1 minute is specified to be 200 mPa · s or less, and the content of each component is further determined. By making it within the range specified in the present invention, the dewatering in the papermaking net is good at the time of wet papermaking, the water content after the papermaking dewatering can be moderately suppressed, and excellent papermaking properties can be secured. The effect is achieved.

Claims (10)

In a non-combustible sheet obtained by adding a flocculant to a raw material slurry and performing wet papermaking in a coagulated state, or a non-combustible molded product obtained by hot pressing the non-combustible sheet, only steel slag, steel, based on the total solid content of the raw material slurry Combination of slag and calcium silicate, combination of steel slag, calcium silicate and water-containing inorganic compound, combination of steel slag and calcium silicate, or combination of steel slag and water-containing inorganic compound 30 to 90% by mass ( Solid content), cellulose fiber 0.4-20 mass% (solid content), inorganic fiber in an amount such that the total of the cellulose fiber and inorganic fiber is 3-40 mass% (solid content), sepiolite 5-40 mass% The non-combustible sheet or the non-combustible molded article, which contains (solid content) and 1 to 20% by mass (solid content) of a synthetic polymer. The sepiolite was treated with a standard disaggregator specified in JIS P 8220: 1998 using tap water at 20 ° C. with a liquid volume of 1500 ml, a concentration of 3% by mass, and a shaft rotation speed of 30000 times, and then the inner cylinder rotation The incombustible sheet according to claim 1, wherein the viscosity measured at a liquid temperature of 25 ° C, an inner cylinder rotation speed of 6 rotations / minute, and an inner cylinder rotation time of 1 minute using a mold viscometer is 200 mPa · s or less. Incombustible molded body. The incombustible sheet or incombustible molded body according to claim 1 or 2, wherein the steel slag is made of at least one selected from blast furnace slag and steelmaking slag. The incombustible sheet or the incombustible molded article according to any one of claims 1 to 3, wherein the calcium silicate is at least one selected from wollastonite, zonotlite, and tobermorite. The incombustible according to any one of claims 1 to 4, wherein the water-containing inorganic compound comprises at least one selected from aluminum hydroxide, magnesium hydroxide, calcium hydroxide, dihydrate gypsum and calcium aluminate. Sheet or incombustible molding. The non-combustible sheet or non-combustible molded article according to any one of claims 1 to 5, wherein the inorganic fiber comprises at least one selected from rock wool fibers and glass fibers. The incombustible sheet or incombustible molded article according to any one of claims 1 to 6, wherein the synthetic polymer is composed of at least one selected from a thermosetting resin, a thermoplastic resin, and a synthetic rubber. The incombustible sheet or incombustible molded article according to any one of claims 1 to 7, comprising a laminate of two or more sheet layers. The noncombustible sheet or noncombustible molded article according to any one of claims 1 to 8, wherein the basis weight is 500 g / m ² or more. The non-combustible sheet or non-combustible molded article according to any one of claims 1 to 9, wherein the non-combustible sheet or the non-combustible molded article is a laminate of two or more sheet layers by a winding paperboard machine.