JPH0380745B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an inorganic filler paper and a method for manufacturing the same.More specifically, the present invention relates to an inorganic filler paper with an extremely high aggregate content in appearance, but it can be shaped and processed as appropriate. After processing, 700~
This invention relates to low-temperature sinterable inorganic filler paper, which is a type of ceramic paper that sinters while retaining its formed shape and exhibits ceramic-like hardness and properties when heat-treated at a low temperature of about 1000°C, and a method for producing the same. It is something. Conventionally, inorganic filler paper made of pulp, aggregate, and fixing agent is known as ceramic paper or ceramic sheet, and a technique of dispersing these raw materials in water and forming it into paper is also known. For example, JP-A-56-63099, JP-A-56-
No. 165097 and Japanese Unexamined Patent Application Publication No. 13612/1984 are known, and both of them are made into paper sheets by making natural or synthetic fibers together with aggregate (inorganic fine particles). However, most of the aggregates used in these conventional ceramic sheets or ceramic papers have a high sintering temperature of 1,300°C or higher, resulting in extremely poor sintering processability and no low-temperature sinterability, and they reach high temperatures. The molded product is damaged beforehand and its shape retention is poor. Therefore, as a result of various studies in view of the above, the present inventors found that conventional aggregates have the effect of lowering the sintering temperature.
The present invention was completed based on the discovery that by adding a sintering agent having a self-sintering effect, an inorganic filler paper having low-temperature sinterability and shape retention can be obtained. That is, the first aspect of the present invention is a low-temperature sinterable inorganic filled paper comprising pulp, aggregate, and a fixing agent, further comprising a sintering agent. The manufacturing method is divided into two types depending on the difference in melting point or solubility of the sintering agent. One of them, the second invention, involves dispersing pulp, aggregate, sintering agent, and fixing agent in water, and then making paper. This is a method for producing a low-temperature sinterable inorganic filler paper, which is characterized by a third method.
The invention is a method for producing low-temperature sinterable inorganic filled paper, which comprises dispersing pulp, aggregate, and fixing agent in water to form paper, and then adding a sintering agent. Hereinafter, the first invention, the second invention, and the third invention will be described in detail simply as the present invention when there is no need to distinguish them because they have common features. The pulp used in the present invention can be any pulp used in the ordinary paper manufacturing industry, regardless of the type or shape of the cellulose. For example, the usual LBKP, NBKP, GP, CGP, SCP, CP as fiber materials
Examples include wood pulp such as kozo, mitsumata, bast fibers such as hemp, chemically synthetic fibers such as rayon and polyolefin, and inorganic fibers such as asbestos, calcium silicate, glass, and ceramics. In addition, as aggregates, those mainly composed of clay minerals such as kaolinite, halloysite, montmorillonite, pyrophyllite, sericite, and talc, such as Frogme clay, Kibushi clay, Shigaraki clay, Naegi clay, Takadama kaolin, Shibata kaolin, Joshin clay, Ina clay, Murakami clay, Tsuki clay (red clay), Amakusa pottery stone, Hattori pottery stone, Ishikawa pottery stone, Mitsuishi wax stone, etc.
Those whose main components are silica, feldspar, and feldspar (stone powder), such as Fukushima silica, Fukushima feldspar, Kamado feldspar, Mikumo feldspar, Hiratsu feldspar, Taishu stone, and Mikawa feldspar, and weathered granite called Saba and Mokei. , calcium carbonate, dolomite, bentonite, acid clay, and siyamoto. Examples of fixing agents include natural ones such as cationically modified starch, acidic starch, starch derivatives such as dialdehyde starch, vegetable gums such as gum arabic and guar gum, sodium alginate, and synthetic polymers such as anionically modified, cationically modified and amphoteric modified polyacrylic. Examples include one or more of amide, polyethyleneimine, polyamide, epoxy resin, amine, acrylic-related monomers alone or copolymers, and inorganic systems such as polyvalent metal salts such as aluminum sulfate. It functions to fix pulp, aggregate, and a sintering agent (described later) with a good yield, and its usage is no different from that in normal papermaking technology. In addition, the sintering agent in the present invention enhances its low-temperature sinterability when combined with aggregates, exhibits a bonding effect between aggregates, and has a self-sintering effect. All of these substances have melting points of 600 to 1250°C and exhibit a glassy state when melted alone. When these substances are mixed with aggregate and fired, they react with the aggregate to form a ceramic-like solid at 700-1000°C. Specific examples include alkaline earth metal hydroxides such as lithium hydroxide, calcium hydroxide, and magnesium hydroxide; alkali metal carbonates such as sodium carbonate, potassium carbonate, lithium carbonate, sodium bicarbonate, and potassium bicarbonate; Alkali metal carbonates, alkali metal chlorides such as sodium chloride and potassium chloride, alkaline earth metal chlorides such as barium chloride and calcium chloride, aluminum chloride, boric acid and its alkali metal salts, potassium metaborate, sodium metaborate, meta Alkali metal metaborate salts such as lithium borate, alkali metal salts of tetraborate such as sodium tetraborate, potassium tetraborate, lithium tetraborate, alkaline earth metal salts of tetraborate such as calcium tetraborate, potassium phosphate, sodium phosphate, lithium phosphate Alkali metal phosphates such as sodium pyrophosphate, sodium hydrogen pyrophosphate, potassium pyrophosphate, alkaline earth metal pyrophosphates, alkali pyrophosphates such as sodium calcium pyrophosphate, sodium calcium pyrophosphate, magnesium pyrophosphate, etc. Metal alkaline earth metal salts, metaphosphates such as sodium metaphosphate, potassium metaphosphate, calcium metaphosphate, alkali metal silicates such as sodium silicate, potassium silicate, lithium silicate, alkali metal sesquisilicate, alkali metal metasilicate , PbO−
SiO ₂ frit, PbO−B ₂ O ₃ −SiO ₂ frit,
Na ₂ O−PbO−B ₂ O ₃ −SiO ₂ -based frit, Na ₂ O−
Frits such as CaO−B ₂ O ₃ −SiO ₂ type frits,
Examples include one or more selected from glass volcanic rocks such as glass cullet, black stone, perlite, and pinestone, wood ash, bone ash, and colemanite. Among these, pyrophosphates are preferred. These sintering agents are classified into two types based on their solubility. That is, its solubility (g/
100gH ₂ O (20°C) is approximately 0.5 or less, which is poorly soluble, and the rest is soluble. The former is a sintering agent that can be added internally and can be dispersed together with pulp, aggregate, and fixing agent during papermaking.
The latter is a so-called externally added sintering agent that is added after paper is made using only pulp, aggregate, and fixing agent. Among the above sintering agents, the sintering agents that can be added internally are alkaline earth metal hydroxides, lithium carbonate, lithium tetraborate, calcium tetraborate, lithium phosphate, sodium biphosphate, alkali metal pyrophosphates, and alkaline earth metal pyrophosphates. The sintering agent is one or more selected from salt, potassium metaphosphate, calcium metaphosphate, frit, glass cullet, glassy volcanic rock, wood ash, bone ash, and colemanite, and the others are externally added sintering agents. As the treatment for making the powder less soluble, a technique generally known as a powder encapsulation technique in which the surface layer of the powder is coated with an elution-preventing film can be applied. That is, methods that utilize the reaction between anion-dissociating polymer compounds such as sodium alginate, sodium polyacrylate, sodium polystyrene sulfonate, and carboxymethyl cellulose and multi-charged metal salts, and reactions between gelatin/gum arabic and aluminum sulfate. Those that utilize the reaction between a polymer anion compound and a polymer cation compound, or diamine compounds, diol compounds,
A so-called interfacial polymerization method in which a diol compound and an acid chloride are reacted to form polyamide or polyester can be applied. The inorganic filler paper of the present invention is composed of the above raw materials, and the composition ratio is 200 to 500 parts by weight of aggregate to 100 parts by weight of pulp. Aggregate plays an important role in maintaining the shape of the inorganic filler paper of the present invention after it is fired. That is, when the inorganic filler paper is fired, organic materials such as pulp are burned and lost. Therefore, the fired product is formed only from aggregate, which is the firing residue. Also,
It is necessary to maintain the shape while the organic matter disappears during firing. If the amount of aggregate used is too small, the firing residue (aggregate) will be small and the shape after firing will not be maintained. In addition, aggregate affects shrinkage, shape retention, hardness, porosity, etc. during firing. The amount of aggregate used is determined by the use of the fired product. When used in the field of so-called soft ceramics with high porosity and low strength, the amount of aggregate used can be relatively small; when used in the field of ceramics with low porosity and high hardness, It is necessary to increase the amount of aggregate used. The inorganic filler paper of the present invention can be used for a wide variety of purposes as described below. Therefore, as a result of various tests, when used in soft ceramics fields such as craft materials and filters, pulp 100% is used as the aggregate.
200 to 400 parts by weight is appropriate, and when used in the field of industrial materials such as structural catalyst carriers,
400-500 parts by weight is reasonable. Mix aggregate and sintering agent with fibrous materials such as pulp,
When forming a paper layer using a normal papermaking method, it is necessary to effectively fix aggregate and sintering agent to the fibrous material. In normal wet papermaking methods, the paper material is dispersed in a large amount of water (0.5-1.0% solids). Therefore, if no fixing treatment is performed, the aggregate will not be fixed to the fibers and will be washed away. In the present invention, the fixing agent is not particularly limited,
A fixing agent that is compatible with the aggregate is used, and the amount and method of addition is devised. Generally used fixing agents are added to the dispersion of aggregate, sintering agent, and pulp to achieve fixing, as used in conventional papermaking processes. The amount of fixing agent used is 1 per 100 parts by weight of pulp.
~25 parts by weight. The action of the fixing agent is that while fibers and aggregates behave as anions in water, the fixing agent behaves as cations, and the two bond ionically in water, coagulate, and fix.
This type of aggregation effect is not proportional to the amount of fixing agent (cationizing agent), and there is a range in which it acts most effectively. If it is less than 1 part by weight, the fixing effect will not be sufficient, and if it exceeds 25 parts by weight, the fixing effect will not be increased and it will be uneconomical. Therefore, it is most effective to add 1 to 25 parts by weight per 100 parts by weight of pulp. The inorganic filler paper according to the present invention contains an organic substance such as pulp as a basic raw material, and this organic substance is burned and disappears during firing, thereby creating voids in the areas where the organic substance disappears. Therefore, the shape of the object to be fired becomes unstable due to the generation of voids, resulting in damage to the shape during the firing process. Therefore, it is necessary to bind the aggregates together in parallel with the generation of the voids, and to cause the aggregates to fuse together as the firing temperature increases. In other words, in the early stages of firing, it has a self-adhesive effect, and in the later stages of firing (after the temperature rises), the shape is maintained by combining the aggregate with a substance that has the effect of lowering the sintering temperature and melting the aggregate. became possible. All of the sintering agents used in the present invention have the effect of lowering the sintering temperature of the aggregate and causing it to fuse. If the amount of the sintering agent, which lowers the firing temperature and softens the material during the firing process, is used in too large an amount, the material will become too soft during firing and will not be able to maintain its shape. Moreover, if the amount used is small, the sintering effect will be small and the shape will not be maintained during the firing process. As a result of various tests, 50% per 100 parts by weight of pulp
~1000 parts by weight was found to be most effective. The amount of sintering agent used also differs depending on the type of sintering agent. If the effect of lowering the aggregate melting temperature is significant, it cannot be used in too large a quantity. In addition, if it does not significantly lower the aggregate melting temperature, it is necessary to use it in a relatively large amount. Next, referring to the second invention of the present invention, this is a low-temperature sinterable inorganic filler paper that is made from a so-called internally added dispersion in which pulp, aggregate, sintering agent, and fixing agent are combined. For this purpose, pulp is first dispersed using conventional papermaking raw materials such as difficult-to-understand methods such as pulpers, beaters, and refiners. Separately, aggregate and sintering agent are dispersed with water using a high-speed dispersion machine such as a Keddy mill or mixer to prepare a liquid. Then, mix and disperse the two. At this time, the solid content concentration is usually about 1 to 5% by weight to obtain a good dispersion. The above-described fixing agent is added to this dispersion to fix the pulp, aggregate, and sintering agent. Of course, the pulp, aggregate, sintering agent and fixing agent may be mixed together from the beginning and dispersed in a large amount of water. However, depending on the type of aggregate and sintering agent, if they are added in large amounts, the water content may decrease and the strength of the wet paper may also deteriorate, so dispersion of each raw material is required as described above. Preferably, the liquid is prepared and mixed. Regarding the fixing agent, a water-soluble anionic compound (for example, polyacrylamide modified product, sodium alginate, gum arabic, etc.) is added to the dispersion of pulp, aggregate, and sintering agent, and then a cationic compound is added.
Particularly effective is a method in which the pulp, aggregate, and sintering agent are agglomerated through the aggregation effect of the two. Furthermore, it is also effective to change the order in which the anionic compound and cationic compound are added in the fixing agent, or to divide the amount of addition into several portions. If desired, a wet and dry paper strength enhancer is also added to the dispersion of pulp, aggregate, sintering agent, and fixing agent. For this purpose, for example, synthetic materials such as polyacrylamide compounds and natural products such as guar gum and starch are used as dry paper strength enhancers, while urea, melamine-based formalin condensates, and epichlorohydrin are used as wet paper strength enhancers. Polyamide resin and the like are used. Add the above mixed dispersion to a solid content concentration of 0.5 to 1.0%.
Dilute to a certain extent, pour it onto a wire mesh, rinse with water, and make paper. After papermaking, the paper is peeled off from the wire mesh according to a conventional method, and then dried to obtain the desired product. The sintering agent used in this second invention is exclusively a sparingly soluble sintering agent among the sintering agents mentioned above. The amount used is pulp
50 to 1000 parts by weight per 100 parts by weight of low-temperature sinterable inorganic filler paper has the effect of lowering the sintering temperature of the aggregate and fusing it to the extent that it can maintain its shape during the firing process. Largely desirable. The amount of aggregate used is 200 to 500 parts by weight per 100 parts by weight of pulp.
It is suitable for various physical properties such as hardness and porosity. The amount of fixing agent to be used is 1 to 25 parts by weight per 100 parts by weight of pulp, which is optimal in terms of fixing efficiency of the pulp, aggregate and sintering agent, and papermaking efficiency. Next, the third invention is a method for producing low-temperature sinterable inorganic filler paper when the sintering agent used is soluble, and paper is made from a dispersion of only pulp, aggregate, and fixing agent. This is by a so-called external addition method in which a sintering agent is then added. Therefore, the process up to paper making is the same as the second invention except for the presence or absence of a sintering agent, and the only difference is the manner in which the sintering agent is added. In other words, since the soluble sintering agent is washed away by a large amount of water, it cannot be used in wet paper making (internal addition method) together with the pulp, aggregate, and fixing agent. The present invention was completed after discovering that the object of the present invention can be achieved even if the fixing agent is used alone in paper making and then added in post-processing. For addition during post-processing, impregnation treatment with an aqueous solution or paste dispersion of a soluble sintering agent on the paper after papermaking,
Methods such as painting, spray painting, etc. are applied. In this case, it is preferably used in combination with an impregnation treatment agent. Impregnating agents have the effect of adhering components within the paper web, imparting plasticity after impregnation, and reinforcing the paper quality, and are usually sizing agents such as polyvinyl alcohol, carboxymethyl cellulose, and starch, polyacrylic acid ester polymers, and styrene.・Plastic materials such as butadiene copolymers are used. In addition, the types and amounts of pulp, aggregate, fixing agent, amount of sintering agent added, and reasons for their limitations are also explained in the first section.
There is no difference from the second invention. By the way, the method for manufacturing the low-temperature sinterable inorganic filler paper of the present invention can be divided into two methods, an internal addition method and an external addition method, depending on the type of sintering agent.
Although explained separately, depending on the type of each raw material, physical properties, papermaking efficiency, and physical properties of the final product, both may be used in combination, or the same sintering agent may be divided into several parts and either one of the two addition methods or a combination may be used. I can do it. The inorganic filler paper of the present invention obtained in this way has a
Sintered in a short time at a low temperature of 1000℃, it has a hardness and appearance similar to ceramics. The product of the present invention before sintering is a normal inorganic filler-containing paper and can be subjected to general paper forming processes. For example, it is possible to perform the same forming processes as ordinary paper, such as giving a wavy shape by corrugated board shaping, three-dimensional forming by bag making and box making, giving uneven shapes by embossing, and laminating by rolling and folding. . If this molded product is sintered, it will maintain its shape before sintering and become ceramic-like. The invention therefore lends itself to the provision of much more complex and thin-layered ceramic structures than the clay mold treatments employed in the conventional ceramic industry. Taking advantage of this characteristic, the present invention can be applied to the following fields. (1) Fields that take advantage of the characteristics of porous ceramics When the organic matter (pulp component) in the filler paper burns and disappears, voids are created, making it possible to create porous fired products. Therefore, it can be used as an adsorbent. Examples include oil-impregnated water treatment bodies, gas adsorbents, catalyst adsorption carriers, chemical-resistant and heat-resistant membranes (filters), and the like. (2) Fields that take advantage of heat and chemical resistance Fired products have properties similar to those of ceramics, such as catalyst carriers, heat storage bodies, gas exchange bodies, chemical liquid overbodies, heat-resistant culture materials, and heat-resistant insulators that have heat and chemical resistance. etc. (3) Fields that take advantage of the characteristics of molding processing Structural catalyst carriers, structural adsorbents, heat-resistant partition materials, structural heat storage agents, heat-resistant and chemical-resistant diaphragm materials, heat-resistant and heat-retaining building materials, etc. (4) Characteristics of handicraft materials Fields where it can be used: It can be processed in the same way as regular paper, such as folding and cutting. Therefore, it is possible to make objects such as origami, artificial flowers, and dolls and fire them. Special shaped ceramic materials, heat-resistant decorative walls (tiles)
Materials, etc. (5) Fields that take advantage of thin layer sinterability and fusibility properties If the present invention is bonded and sintered, fusion bonding is possible at the bonded portion. Therefore, fusion bonding with other ceramic materials is possible. Surface treatment materials for unglazed ceramic bodies, decorative surface treatment materials, etc. (6) Fields that take advantage of special structural formability Used as functional structures that integrate the characteristics of each of the above items. Microorganism carrier for simple septic tank, fish reef structure, etc. The present invention will be specifically explained below with reference to Examples. Example 1 (internal addition method) 100g of pulp raw material (50g of abaca pulp,
Disperse 25 g of LBKP, 25 g of NBKP) in 25 g of water,
(400 ml of CSF) To this were added 350 g of Rakuyaki Haido (kaolin clay) as aggregates, 100 g of kaolinite, and 350 g of sodium/calcium pyrophosphate dispersed in 5 parts of water as a sintering agent and mixed with stirring. To this dispersion, 3.6 g of a cationic acrylamide flocculant (manufactured by Meisei Chemical Industry Co., Ltd., Firex RC-104) was added and mixed with stirring for 5 minutes. , Polystron 191), and then 3.6 g of a cationic acrylamide flocculant were added again to perform flocculation and fixation. Water was added to dilute this to a total volume of 50, and 1.5 of this was used to create a 25 x 25 cm square sheet. (Basm weight approx.
390g/m ² ) The obtained sheet was made into a cylindrical shape of φ3cm x 5cm,
It was calcined in an electric furnace at 400°C for 30 minutes, and then fired at 850°C for 30 minutes. The obtained fired product exhibited a linear shrinkage of about 24% relative to its original size, maintained a cylindrical shape, and was turned into a ceramic. Moreover, the compressive strength in the longitudinal direction was 1.5 Kg/cm ² . When the sheet was folded into an origami crane and fired under the above conditions, it was made into ceramic with the shape of an origami crane. Example 2 (Internal addition method) 400 g of lithium carbonate was dispersed in 1 of a 0.5% sodium alginate aqueous solution and separated. Next, add lithium carbonate moistened with sodium alginate solution.
It was poured into a 0.5% calcium chloride aqueous solution 2 with vigorous stirring and then separated. Lithium carbonate that has undergone the above treatment to make it difficult to dissolve is heated at 20°C.
It was found that the amount of elution loss per 100 ml of water was suppressed to about 1/10 of that of the untreated sample. The poorly water-soluble lithium carbonate thus obtained was mixed with 100 g of raw material pulp (50 g of abaca pulp, 20 g of LBKP,
As a sintering agent for NBKP20g, asbestos 10g)
350g, Frogme clay 200g as aggregate, Amakusa pottery stone 150g,
A cationic acrylamide flocculant (manufactured by Meisei Chemical Industry Co., Ltd., Firex RC-104) as a fixing agent
A 25×25 cm square sheet was prepared in the same manner as in Example 1 using 4 g of anionic acrylamide paper strength enhancer (FIREX M, manufactured by Meisei Chemical Industry Co., Ltd.). (Basic weight approximately 320 g/m ² ) Also, when it was molded into a cylindrical shape of φ3 cm x 5 cm and fired in the same manner as in Example 1, it showed a linear shrinkage of approximately 13% with respect to the original size, and the cylindrical shape was maintained and it was made into ceramic. did. The compressive strength in the longitudinal direction was 0.6 Kg/cm ² . Example 3 (Internal addition method) Lithium carbonate in 1 5% gelatin aqueous solution
400g was dispersed and separated. Next, lithium carbonate moistened with gelatin was stirred and dispersed in a 5% aqueous gum arabic solution 2, and an aqueous aluminum sulfate solution was added thereto to adjust the pH to 4.5, and the mixture was separated. It was found that the elution loss of lithium carbonate treated to make it less soluble was suppressed to about 1/15 of that of untreated lithium carbonate. The poorly water-soluble lithium carbonate thus obtained was mixed into 100g of raw material pulp (40g of abaca pulp,
LBKP15g, NBKP15g, Mitsumata 10g, glass fiber
20g), 250g of sintering agent, 200g of Kibushi clay and 50g of dolomite as aggregate, 2.5g of cationic acrylamide flocculant (Filex RC-104 manufactured by Meisei Chemical Industry Co., Ltd.) as fixing agent, and anionic acrylamide type. A sheet was prepared in the same manner as in Example 1 using 2.5 g of a paper strength enhancer (FIREX M manufactured by Meisei Chemical Industry Co., Ltd.). (Basic weight: about 240 g/m ² ) When fired in the same manner as in Example 1, cylindrical ceramics were obtained which showed linear shrinkage of about 20% and compressive strength of 0.8 to 0.9 Kg/cm ² . Example 4 (External addition method) 100g of pulp raw material (40g of abaca pulp,
30g of LBKP, 30g of NBKP) were dispersed in 25ml of water (400ml of CSF), and 390g of Ina clay was added as aggregate.
A solution prepared by dispersing 60 g of calcium carbonate in 6 parts of water was added and mixed with stirring. To this dispersion, 1.65 g of a cationic acrylamide flocculant (manufactured by Meisei Kagaku Kogyo Co., Ltd., FIREX RC-104) was added and mixed with stirring for 5 minutes. 2.75 g of Fireex M) and then 1.65 g of a cationic acrylamide flocculant were added again to perform flocculation and fixation. Add water to this for a total of 50
A 25 x 25 cm square sheet was made using 1.5 of the diluted solution. (Basic weight approximately 240g/m ² ) Next, 50g of lithium hydroxide was added to the SBR latex.
Polyvinyl alcohol mixed aqueous solution (SBR latex 1.0%, polyvinyl alcohol 1.0%)
Dissolve in 500ml. The sheet was impregnated with this mixed aqueous solution (impregnation rate 100%) and dried at 100 to 110°C.
When the obtained paper was formed into a cylindrical shape and fired in the same manner as in Example 1, the linear shrinkage was 23-24% and the compressive strength was 0.8-0.9.
A cylindrical ceramic was obtained exhibiting a weight of Kg/cm ² . Example 5 (combined internal and external addition method) 100g of pulp raw material (30g of abaca pulp,
LBKP30g, NBKP30g, GP10g) were dispersed in 25ml of water (400ml of CSF), and 350g of Shibata kaolin, 100g of Murakami clay, 50g of Fukushima feldspar as aggregates, and 250g of sodium/calcium/magnesium pyrophosphate as sintering agents were dispersed in 5% of water. The solution was added and mixed by stirring. Add a cationic acrylamide flocculant (FIREX RC- manufactured by Meisei Kagaku Kogyo Co., Ltd.) to this dispersion.
107) After adding 2.55g and stirring for 5 minutes, add anionic acrylamide paper strength enhancer (Meisei Chemical Industry Co., Ltd.
4.25 g of Fireex M) (manufactured by Firex Co., Ltd.) and then 2.55 g of a cationic acrylamide flocculant were added again to effect coagulation and fixation. Water was added to dilute this to a total volume of 50, and one of these was used to prepare a 25 x 25 cm square sheet. Next, dissolve 30g of lithium hydroxide in 300ml of water,
The previous sheet was impregnated with an impregnation rate of 100%. When the obtained paper was subjected to firing in the same manner as in Example 1, a cylindrical ceramic having a linear shrinkage of 27% and a longitudinal compressive strength of 1.6 kg/cm ² was obtained. Example 6 The pulp raw materials, aggregate, sintering agent, and fixing agent shown in Table 1 were dispersed in water in the same manner as in Example 1, and the total amount was mixed with stirring.
Diluted to 50. (Nos. 3 and 4 are excluded because of the sintering agent external addition method.) Of these, No. 3 was used to produce a 25 x 25 cm square sheet. A sintering agent was externally added to Nos. 3 and 4, and a firing test was conducted on these in the same manner as in Example 1. Table 2 shows the physical properties of the sheet before and after firing.

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Claims (1)

[Scope of Claims] 1. A low-temperature sinterable inorganic filled paper comprising pulp, aggregate, and fixing agent, further comprising a sintering agent. 2. For 100 parts by weight of pulp, 200 to 500 parts by weight of aggregate, 1 to 25 parts by weight of fixing agent, and 50 to 1000 parts by weight of sintering agent.
The low temperature sinterable inorganic filled paper according to claim 1, consisting of parts by weight. 3 Lithium hydroxide, alkaline earth metal hydroxide, alkali metal carbonate, alkali metal bicarbonate, alkali metal chloride, alkaline earth metal chloride, aluminum chloride, boric acid and alkali metal borate, as sintering agents; Alkali metal metaborate, alkali metal tetraborate, alkaline earth metal tetraborate, alkali metal phosphate, alkali metal pyrophosphate, alkaline earth metal pyrophosphate, alkali metal alkaline earth metal pyrophosphate, meta A patent claim using one or more selected from phosphate, alkali metal silicate, alkali metal sesquisilicate, alkali metal metasilicate, frit, glass cullet, glassy volcanic rock, wood ash, bone ash, and colemanite. Low-temperature sinterable inorganic filler paper according to scope 1 or 2. 4. A method for producing low-temperature sinterable inorganic filled paper, which comprises dispersing pulp, aggregate, sintering agent, and fixing agent in water, and then forming paper. 5 For 100 parts by weight of pulp, 200 to 500 parts by weight of aggregate, 50 to 1000 parts by weight of sintering agent, and 1 to 25 parts by weight of fixing agent.
5. The method for producing a low-temperature sinterable inorganic filled paper according to claim 4, wherein parts by weight are dispersed in water and then paper is made. 6 As a sintering agent, alkaline earth metal oxide, lithium carbonate, lithium tetraborate, calcium tetraborate,
One or more selected from lithium phosphate, sodium biphosphate, alkali earth metal pyrophosphate, potassium metaphosphate, calcium metaphosphate, frit, glass cullet, glassy volcanic rock, wood ash, bone ash, and colemanite. A method for producing a low-temperature sinterable inorganic filler paper according to claim 4 or 5. 7. A method for producing low-temperature sinterable inorganic filler paper, which comprises dispersing pulp, aggregate, and fixing agent in water to form paper, and then adding a sintering agent. 8. Paper is made by dispersing 200 to 500 parts by weight of aggregate and 1 to 25 parts by weight of fixing agent in water based on 100 parts by weight of pulp, and then 50 to 1000 parts by weight of sintering agent is added. A method for producing a low-temperature sinterable inorganic filler paper as described in . 9 As a sintering agent, lithium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, alkali metal chloride, alkaline earth metal chloride, aluminum chloride, boric acid, alkali metal borate, alkali metal metaborate , sodium tetraborate, potassium tetraborate, sodium phosphate, potassium phosphate, sodium pyrophosphate, potassium pyrophosphate, sodium metaphosphate, potassium metaphosphate, alkali metal silicate, alkali metal sesquisilicate,
9. The method for producing a low-temperature sinterable inorganic filler paper according to claim 7 or 8, wherein one or more selected from alkali metal metasilicate salts are used.