JPH07330451A - Thermosetting monolithic refractory and executing method therefor - Google Patents

Abstract

PURPOSE:To obtain the refractory that has excellent flowability at ordinary temp. and causes no change in the lapse of time during its preservation in a wet state and also is hardened in a short time through heating to a low temp. by mixing refractory aggregate, a thermosetting material, a heat-sensitive gelatinizing agent and a binder, each of which is specific, in respective prescribed amounts. CONSTITUTION:In the production of this refractory, first, 100 pts.wt. aggregate (e.g. electrofused alumina, etc.) of which particle size distribution is adjusted so that it contains a 10 to 30wt.% fine powder having <=44mu particle size, a 0.1 to 10 pts.wt. thermosetting material consisting of a phenol resin having a 70 to 200 deg.C softening point, a 0.1 to 10 pts.wt. polysaccharide based heat- sensitive gelatinizing agent (e.g. corn starch) and a 0. 5 to 3 pts.wt. hardly soluble binder consisting of hardly soluble sodium phosphate and/or condensed aluminum phosphate are mixed together. Then, water is added to this mixture and the resulting material is kneaded and cast and thereafter the cast material is heated to 60 to 100 deg.C to harden it and to obtain the objective refractory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to a blast furnace gutter, a gutter cover,
Mixer pig iron port, lance, hot air stove, soaking furnace, heating furnace, electric furnace, DH, RH, tundish, rotary kiln,
The present invention relates to an amorphous refractory for lining a refractory furnace such as an incinerator and a flue, and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, a casting method has been mainly used as a method of applying a lining material for a refractory furnace as described above. As a material for pouring construction, a cement-based pouring material using alumina cement, high-alumina cement or the like as a binder is mainly used in a mixture of refractory raw materials whose particle size is adjusted, and silicate or phosphorus is partially used as a binder. Some have added acid salts and the like.

In terms of construction, it has been impossible to carry out the kneading with water in advance on these irregular refractory materials and carry them to the construction site for construction, because they have room temperature curing properties. For this reason, powdered materials are usually brought into the construction site for kneading, transportation and construction. For this reason, large equipment such as a mixer is required, and the construction is complicated and labor-intensive, resulting in poor efficiency. In addition, dust and the like are generated during kneading, which is not preferable in terms of working environment.

The refractory composition used to solve these problems is not a powder material as in the conventional case, but a wet refractory composition is thermoset, so that kneading at a work site becomes unnecessary, Various thermosetting amorphous refractories have been proposed to save labor and improve the working environment.

As this thermosetting amorphous refractory, for example, Japanese Unexamined Patent Publication (Kokai) No. 63-162579 discloses an irregular refractory in which materials are kneaded in advance with water and heat-cured at the construction site. . However, this is especially because no binders that cause curing are added,
The added water evaporates and is hardened only by the heat of heating, and it takes a long time to cure and it is not sufficient as a tissue.

Further, the use of coarsely grained sodium silicate glass as a binder is disclosed in JP-A-4-8.
Although disclosed in Japanese Patent No. 3764, since the reactivity between the sodium silicate glass that has been eluted in a small amount at room temperature and the fine powder raw material is large, the fluidity decreases as the number of storage days after production increases, and it becomes unusable. Not practical.

Further, it is possible to coat a sodium silicate glass having a controlled particle size with paraffin before use.
As disclosed in Japanese Patent Publication No. 75, the paraffin does not have sufficient coating strength, so that the coating agent is easily rubbed against the aggregate during kneading and carrying in and the coating agent is easily peeled off. As a result, as in the above case, a change with time occurs during storage, resulting in poor fluidity. In addition, since paraffin in the material is volatilized when heated and cured, cracks occur and the structure deteriorates, which is not sufficient as a construction body.

In addition, it is disclosed in JP-A-5-70246 that a synthetic resin emulsion and a heat-sensitive gelling agent are used in combination as a thermosetting agent, but the synthetic resin emulsion has a high viscosity and can be added with a small amount. Workability is significantly reduced. Further, when drying the construction body, almost all of such an organic binder is thermally decomposed and volatilized in a relatively low temperature range of 300 to 500 ° C., so that the structure is severely deteriorated. As a result, sufficient durability cannot be obtained when used at high temperatures. That is, although a binder using a synthetic resin emulsion and a heat-sensitive gelling agent together can heat-harden the refractory, it significantly reduces the strength in the dry temperature to intermediate temperature range, and is therefore not optimal as a binder for the refractory. Absent.

[0009]

DISCLOSURE OF THE INVENTION The object of the present invention is to have good fluidity at room temperature, not to change with time during storage in a wet state, to be castable, and to facilitate heat curing. , Shape retention by low temperature heating at 60 to 100 ° C, ready for deframing, heat curing in a short time, high dry strength, no deterioration at intermediate temperature, good corrosion resistance The object is to provide a thermosetting amorphous refractory material that fully satisfies all the properties required for thermosetting amorphous refractory materials, and a construction method thereof.

[0010]

In order to achieve the object, the thermosetting amorphous refractory material of the present invention has a particle size adjusted refractory aggregate 10 containing 10 to 30% by weight of fine powder of 44 μm or less.
0% by weight, 0.1 to 10% by weight of a phenolic resin having a softening point of 70 to 200 ° C. as a thermosetting agent, 0.1 to 10% by weight of a polysaccharide-based heat-sensitive gelling agent, and a difficult binder. Soluble sodium phosphate as a soluble binder, and /
Alternatively, it is characterized by blending 0.5 to 3% by weight of condensed aluminum phosphate.

Further, the construction method is characterized in that water is added and kneaded to the irregular-shaped refractory, poured, and then heated to 60 to 100 ° C. to be cured.

The refractory aggregate used in the present invention includes siliceous materials such as silica stone, silica sand, fused silica, hydrous amorphous silica, anhydrous amorphous silica, mullite, etc. as raw materials containing oxides.
Alumina such as bauxite, van shale, sillimanite, kyanite, sintered alumina, fused alumina, calcined alumina, etc., low stone, chamotte, porcelain stone, clay, kaolin, bentonite and other alumina-silica, zircon, zirconia Zirconia, etc., electrofused magnesia, sintered magnesia, alumina-magnesia spinel, basic properties such as calcium oxide, spinel, chromium oxide, chromite such as chromite, etc. as carbides, silicon carbide, aluminum carbide, zirconium carbide, etc. Carbides and nitrides of zirconium nitride, silicon nitride, silicon iron nitride, boron nitride, aluminum nitride, etc., and carbon-containing raw materials of coke, natural graphite, artificial graphite, calcined anthracite, pitch powder, carbon black, carbon brick. And carbonaceous materials such as electrode scraps Boride such as boron, silicon, selected from the group consisting of all of the refractory material of the silicide such as ferrosilicon, it may be used in combination one or more types as necessary.

Among the thermosetting agents, the amount of the phenol resin added is 0.1 to 10 with respect to 100% by weight of the refractory aggregate.
Weight percent is preferred. As the phenol resin, a resol type phenol resin, a novolac type phenol resin or a mixture thereof can be used. As a raw material of the phenol resin, there are phenols such as cresol, xylenol, alkylphenol, ethylphenol, propylphenol, butylphenol, octylphenol, nonylphenol, phenylphenol, catechol, resorcinol, hydroquinone, and bisphenol A other than phenol. They can be used alone or in combination. Here, the resol-type phenol resin causes a dehydration condensation reaction when heated to 60 ° C. or higher, becomes an insoluble and infusible solid, and solidifies. However, when using novolac type phenolic resin,
Since it does not heat-cur as it is, hexamethylenetetramine (hereinafter referred to as hexamine) is used as a curing aid in an amount of about 1 to 20% by weight based on the phenol resin. Hexamine has the property of forming an addition compound in water when mixed with novolac type phenolic resin and adding water and stabilizing at a temperature lower than 60 ° C, but at 60 ° C or higher, the bond is broken and the polymerization starts to become insoluble. It becomes an infusible solid and solidifies.

The amount of the polysaccharide heat-sensitive gelling agent added is preferably 0.1 to 10% by weight based on 100% by weight of the refractory aggregate. Examples of the polysaccharide-based heat-sensitive gelling agent used include starches such as wheat flour starch, potato starch, sweet potato starch, tapioca starch, rice starch, sago starch, corn starch, and high amylose corn starch, and wheat flour, rice flour, corn sorghum powder, and dried sardines. Typical examples thereof include straw powder, dried dried tapioca powder, guar gum, locust bean gum, zanzan gum, karaya gum, agar, gelatin, carrageenan, and gum arabic, but these can be used alone or in combination of two or more.

These polysaccharide-based heat-sensitive gelling agents have a temperature of 6
When the temperature rises to about 0 ° C., hydration rapidly progresses, the swelling expands and the viscosity sharply increases, and a gelled state occurs. For this reason, when a polysaccharide-based heat-sensitive gelling agent is used, the fluidity of the construction body is suppressed during drying and the initial strength of the construction body is expressed as an organic sizing agent. It is possible to obtain various tissues.

As the sparingly soluble binder used in the present invention, one or more kinds of sparingly soluble sodium phosphate and condensed aluminum phosphate are used.

The sparingly soluble sodium phosphate means Al ₂ O ₃ , SiO ₂ , B ₂ O in the condensation process of sodium phosphate.
₃ , a small amount of MgO, CaO, etc. was added to insolubilize the surface or a part of the sodium phosphate particles in water, and condensed aluminum phosphate was dusted by steam after lightly burning the primary aluminum phosphate. It is a thing. These additives are used in the range of 0.5 to 3% by weight.

For the casting material of the present invention, a dispersant used for ordinary casting materials can be used. Examples of the dispersant include alkali metal phosphates, alkali metal carboxylates, alkali metal humates, sodium polycarboxylates, sodium alkylsulfonates, sodium aromatic sulfonates, etc., alkali metal silicates, alkali metal carbonates. , Or sodium lignin sulfonate, and one or two substances from which a similar effect can be obtained.
More than one species can be selected and used.

The amount of these dispersants used is within the commonly used range, for example, 0.00 per 100% by weight of refractory aggregate.
It is about 5 to 1.000% by weight.

The thermosetting amorphous refractory material of the present invention further comprises various metal fibers, organic fibers, inorganic fibers, metal powders, known as additives for such refractory materials for pouring.
An antioxidant such as glass and a thickener, a coagulation modifier, a defoaming agent, etc., which are known as additives for mortar, may be added.

[0021]

In order to satisfy the above conditions, the thermosetting amorphous refractory requires that the binder that causes heat curing at a low temperature of 100 ° C. or less does not have room temperature curability. Without deteriorating the structure of the construction body at a high temperature when the binder is dried or used after heating and curing,
It must have excellent strength and corrosion resistance.

As a result of various trial manufactures by the present inventors,
A kneaded product obtained by kneading a particle size-adjusted refractory aggregate, a phenolic resin, a polysaccharide-based heat-sensitive gelling agent, and a sparingly soluble binder, and adding water and kneading is stable at room temperature to 60 ° C to 100 ° C. It was found that when heated, the strength was developed within a short time within 24 hours, and the strength was maintained even when dried to a high temperature. That is, the kneaded product to which the binder is added can retain the fluidity necessary for construction at room temperature for 1 month or more after being produced, and when heated to 60 ° C to 100 ° C, the polysaccharide-based thermosensitive gelation in the binder is achieved. Hydration of the agent,
Also, the gelation of the phenol resin proceeds and the resin is cured.

The thermosetting amorphous refractory material of the present invention has a very small change with time until it is used, even if the wet kneaded material obtained by previously kneading the powder material with water is stored at room temperature for a long time. There is little decrease in fluidity from immediately after kneading to construction, and the construction is easy and can be performed by normal pouring construction. It exhibits a frame-like dry strength, and has high strength and high corrosion resistance when used.

Specifically, the method of construction is to convey a wet kneaded product, and directly or indirectly vibrate at a construction site with a vibration motor, electromagnetic vibration, air rammer, or the like.
It is a construction method in which fluidity is given and then ordinary pouring construction is performed, and then the construction body is directly or indirectly heated by a burner or the like to be cured to have shape retention so that the frame can be deframed.

The present invention is characterized in that it is possible to carry out this ordinary pouring construction, which results in a dense packing during construction to improve the structure of the construction body and improve the durability during use. make it easier. Further, it is possible not only to carry out on-site construction but also to use the molded product as a pre-catable block in which the kneaded product is poured into a mold in advance and cured by heating and dried.

In the present invention, the construction body is 60 to 100 ° C.
Curing by heating in the temperature range is that if the material is designed to be heat-cured at a temperature lower than 60 ° C, which is the lower limit of this temperature range, the temperature for heat-curing becomes close to room temperature, and it may be transported or stored at room temperature. This is because there is a high possibility that the material will be hardened by heating and the fluidity will decrease. In addition, if the material is designed to be heat-cured at a temperature higher than 100 ° C, which is the upper limit of this temperature range, not only will special equipment for heat-curing be required after on-site construction, but it will be sufficient for the construction body during heat-curing. Since heat is not transmitted to the substrate, heat curing becomes insufficient and so-called partial curing occurs, which makes it difficult to remove the frame.

The phenol resin has a softening temperature and a gelling temperature lowered by water. Therefore, the softening point is 70 in order to prevent the kneaded product from changing with time and to cure at a temperature of 60 ° C. or higher.
About 200 ° C is good. If the temperature is lower than this, the time-dependent change of the kneaded product kneaded with water will increase, and the fluidity of the kneaded product will decrease during storage. Further, if the temperature is higher than this, not only does it require a high temperature to cure, but the viscosity of the phenol resin is high during thermal softening, which reduces the penetration force into the tissue in the construction body, that is, between the particles of the aggregate. Since the phenol resin does not sufficiently penetrate into the resin, the effect as a binder may be reduced.

If the amount of the phenol resin added is less than 0.1% by weight, the strength is insufficient and the effect is not obtained.
When the content is more than weight%, the strength is high, but the air permeability of the construction body is impaired and the drying property is poor. Further, the gas generated during the thermal decomposition deteriorates the environment and the resulting increase in the porosity is not preferable.

On the other hand, the polysaccharide-based heat-sensitive gelling agent is insoluble in cold water, but when the temperature rises up to about 60 ° C., hydration rapidly progresses, the swelling rapidly increases, and the viscosity also rapidly rises. It becomes an activated state. Further, by removing water from such gelled state, the gel compound is solidified, and its binding force as an organic paste is increased. In the construction body using this polysaccharide-based heat-sensitive gelling agent, the fluidization of the construction body decreases due to the temperature rise during drying, and the initial strength of the construction body is developed due to the evaporation of water.

If the amount of the polysaccharide heat-sensitive gelling agent added is less than 0.1% by weight, it takes a long time to obtain the initial strength. Further, 10% by weight is sufficient to obtain the initial strength, and addition exceeding that is not very effective. To cure the thermosetting amorphous refractory of the present invention, a temperature of 60 ° C. or higher is required, and the curing temperature depends on the type of the phenol resin, the softening point, the addition amount, and the addition amount of the polysaccharide-based heat-sensitive gelling agent. Affected by. Therefore, when using this thermosetting amorphous refractory, special heating is not required in the case of warm construction where the temperature of the construction site is high, but in the case of cold construction where the temperature of the construction site is low, It is a good method to cure by curing by heating so that the internal temperature becomes 60 ° C or higher. On the contrary, the thermosetting amorphous refractory of the present invention can be heat-cured even at a high temperature of 100 ° C. or higher, but the added water in the kneaded product and the organic matter such as pitch rapidly evaporate, so that The organization deteriorates instead. For this reason, it is possible to obtain a better texture by gradually drying to a high temperature after heating and curing without heating to an unnecessarily high temperature during heating and curing.

As described above, the kneaded product can be heat-cured by using the binder in which the phenol resin and the polysaccharide-based heat-sensitive gelling agent are combined in the above-mentioned addition amount. The body can be dried and used at high temperatures without deteriorating the tissue.

That is, the phenol resin and the polysaccharide-based heat-sensitive gelling agent are not effective even if they are used alone.
When the construction body that uses these two in combination is heated to 60 ° C. or higher, the phenol resin cures, the polysaccharide-based heat-sensitive gelling agent gels from the sol, and the movement of the resin due to the movement of water in the construction body has a high viscosity. Since it is suppressed by aging, the tissue has a uniform strength from curing to drying.

The purpose of the sparingly soluble binder used in the present invention is that it is a sparingly soluble binder, so that it does not change with time at a temperature of 60 ° C. or below where it can be heated and cured, and that the explosion resistance due to bond migration is small. It is in. The poorly soluble binder generally increases in solubility as the water temperature rises, so the amount of dissolution is sufficient to give sufficient strength in the heating and drying process of the construction body, but unlike the soluble binder, it is hardly dissolved in the initial stage. It has a low tendency to bond migration and has excellent characteristics of explosion resistance.

When the amount of the binder added is less than 0.5% by weight, the strength of the refractory composition is not sufficiently exhibited, and when the amount added is more than 3% by weight, the fire resistance of these binders becomes aggregate. Since it is low in comparison, it causes deterioration of fire resistance and is not preferable.

As described above, as the binder used in the present invention, the thermosetting property after curing from 60 ° C. to the drying is used by using the phenol resin and the polysaccharide heat-sensitive gelling agent as the primary binder, Further, by using a sparingly soluble binder as a secondary binder for exhibiting strength in a range from after drying to mid-high temperature, such an object can be achieved.

That is, the construction product using the above-mentioned phenol resin and the polysaccharide-based heat-sensitive gelling agent is a binder having high strength and relatively low volatile content after drying, but carbonization proceeds after drying to medium to high temperatures. Due to the generation of water vapor, carbon dioxide gas, phenol, and other gases, the strength of the construction body deteriorates slightly. Therefore, by using a sparingly soluble binder in such a temperature range, the sparingly soluble binder is heated in the construction body and temporarily melts into a starch syrup-like form, and permeates between the interfaces of the mixed refractory aggregates. By acting as a binder and solidifying, it is possible to obtain a work body having a high strength continuously from the curing to the medium-high temperature range. That is, since the kneaded product prepared by mixing the phenol resin, the polysaccharide-based heat-sensitive gelling agent and the sparingly soluble binder in the water and kneading them with each other hardly causes the binders to react with each other, it can be stored over time. In addition, there is no decrease in fluidity, and it is possible to continuously develop strength from curing to medium and high temperature regions during heat curing.

The thermosetting amorphous refractory of the present invention uses a phenolic resin, a polysaccharide-based heat-sensitive gelling agent as a binder, and a sparingly soluble binder to make it more than or equal to a conventional cement-based casting material. Although it is possible to obtain strength characteristics, further improvement in corrosion resistance of the refractory composition can be expected because CaO is not contained in a binder such as a cement-based casting material.

44 μm in 100% by weight of refractory aggregate
The following fine powder is 10 to 30% by weight:
If the amount exceeds the above, the soluble impurities in the fine powder are likely to react with the hardly soluble binder, causing a change over time, making it difficult to obtain sufficient fluidity, and it becomes difficult to exhibit workability. On the other hand, if it is less than 10% by weight, the fluidity is lowered due to the small amount of ultrafine powder in the composition, and the sintering strength during use is lowered.

[0039]

EXAMPLE A composition prepared by mixing the binder and the binder of Examples 1 to 14 of the present invention and Comparative Examples 2 to 12 shown in Tables 2 and 3 with the refractory aggregate shown in Table 1 was prepared by adding predetermined water. Save the kneaded product after adding and kneading, and after 7 days 40 × 40 × 160
After pouring into a metal frame of mm, it was heat-cured at 80 ° C. for 5 hours and then deframed.

[0040]

[Table 1]

[Table 2]

[Table 3] In addition, in Examples 15 and 16, after kneading the blends in the same manner as described above,
It was stored at room temperature, and after 7 days, it was poured into a metal frame of 40 × 40 × 160 mm, and then heat-cured at 60 ° C. and 100 ° C. for 5 hours and then deframed. For Comparative Example 1, immediately after kneading, the mixture was cast into a metal frame of 40 × 40 × 160 mm and the temperature was 24 at 20 ° C.
After curing for an hour, she was deframed. In Comparative Examples 13 and 14, after kneading the blends as described above, the mixture was stored at room temperature, and after 7 days, 40 × 40 × 16.
After pouring into a 0mm metal frame, 50 ℃ and 12 respectively
After heating and curing at 0 ° C. for 5 hours, the frame was removed. The sample deframed as described above was dried at 110 ° C. for 24 hours and then heated to a predetermined temperature to measure strength and apparent porosity. For the fluidity of the kneaded product, the vibration flow value was measured.

The results obtained are shown in Tables 4 and 5.

[0042]

[Table 4]

[Table 5] From this, the quality examples of the thermosetting amorphous refractories of Examples 1 to 16 were equal to or more than the casting material of Comparative Example 1 in terms of strength and corrosion resistance. Furthermore, immediately after kneading, store at room temperature for 7
There is little decrease in the vibration flow value after 30 days, 14 days, 14 days, and 200 days after which it can be sufficiently constructed.
mm or more.

Next, in Comparative Examples 2 and 3, since only the phenol resin and the polysaccharide-based heat-sensitive gelling agent were used as the binders, the curing was not sufficient by heating at 60 ° C., and samples whose physical properties could be measured were prepared. I couldn't get it.

Further, in Comparative Examples 4 and 5, the addition amount was small even when the phenol resin and the polysaccharide-based heat-sensitive gelling agent were used in combination, so that as a result of Comparative Examples 2 and 3, heating at 60 ° C. The curing was not sufficient, and a sample whose physical properties could be measured could not be obtained. In Comparative Examples 6 and 7, since the amounts of the phenol resin and the polysaccharide-based heat-sensitive gelling agent added were excessive, respectively,
The fluidity of the composition decreased, and after casting, these binders and ultrafine powder floated on the casting surface, causing a so-called skinning phenomenon during heat curing, and the sample swelled slightly during dry curing. Therefore, as for the quality result, the porosity was slightly higher and the corrosion resistance was also lower than that of the above-mentioned Examples. Comparative Example 8,
In Nos. 9 and 11, the addition amount of the difficult-to-understand binder was small and the intermediate strength was remarkably lowered. In Comparative Examples 10 and 12, the addition amount of the difficult-to-understand binder was excessive, and the fluidity decreased as well as the corrosion resistance significantly decreased as the number of storage days passed immediately after kneading. Comparative Example 13 was not sufficiently cured by heating at 50 ° C., and a sample whose physical properties could be measured could not be obtained. On the contrary, in Comparative Example 13, heating at 120 ° C. caused the internal vapor pressure due to the added water content and the pitch to be higher than the thermosetting rate due to the binder at the time of heat curing, and as a result, the sample swelled slightly. Therefore, as for the quality result, the porosity was slightly higher and the corrosion resistance was also lower than that of the above-mentioned Examples. Furthermore, regarding the particle size composition of the blends in Table 1, the fine powder having a particle size of 44 μm or less was adjusted to be 5% by weight and 35% by weight, and kneaded. The respective formulations are shown in Tables 6 and 7.

[0045]

[Table 6]

[Table 7] The binder of Example 1 was used for the binder part. As a result, the formulation of Table 6 had a vibration flow value of 200 mm or less at the added water content of 6.5% shown in the examples due to the small amount of ultrafine powder, resulting in a significant decrease in fluidity.
For this reason, it is unavoidable that the added water content is set to 8.0% so as to obtain a vibrating flow value of 200 mm or more that can be constructed.
When the sample was heat-cured in the same manner as in the above-mentioned Example, the curing strength was remarkably lowered, and therefore the sample after heat-curing was broken when the frame was removed from the cast metal frame, and the quality measurement was impossible.

Next, the ingredients of the blended raw materials were changed and adjusted so that the blended particle size was almost the same as in Table 1, and kneading was performed. The formulations are shown in Tables 8 and 9.

[0047]

[Table 8]

[Table 9] Since the formulations in Table 8 used a large amount of SiC aggregate having a high porosity, the amount of added water was larger than that in Example 11 in order to obtain a vibrating flow value of 200 mm or more that could be applied.
It became 0%. This kneaded product was stored at room temperature in the same manner as in the other examples, and after 7 days, it was cast into a metal frame, and after curing by heating at 80 ° C. for 5 hours and then deframed, the cast surface was cured without cracks or swelling. did. Even after storing this compound at room temperature for 30 days,
The vibration flow value was 200 mm or more.

In addition, the formulation of Table 9 had a vibration flow value of 200 mm or more when the added water content was 5.5%. This kneaded product was cast and heat-cured in the same manner as in the example of Table 8. The obtained sample was cured without cracking or swelling. This formulation also had a vibration flow value of 200 mm or more even after storage at room temperature for 30 days.

As described above, by adding an excessive amount of added water, the aggregate and fine powder of the cast sample are separated to form a nonuniform work body. Therefore, in the present invention, the inventors tried to keep the fluidity within the range.

On the contrary, the blends shown in Table 7 have a good flowability immediately after kneading because the amount of the ultrafine powder is too large.
Similarly to Comparative Examples 6 and 7, after the casting was completed, the binder and the ultrafine powder floated on the casting surface, and a remarkable swelling phenomenon of the construction body occurred during heat curing. This made it impossible to measure the quality of the sample.

[0051]

EFFECTS OF THE INVENTION The thermosetting amorphous refractory of the present invention is a wet kneaded product obtained by kneading a powder material whose particle size has been adjusted in advance with water, and adding a phenol resin, a heat-sensitive gelling agent and a sparingly soluble binder. By adjusting and adding the amount, it is uncured at room temperature and can be stored without lowering the fluidity after kneading.

Further, it is an excellent casting material that can be cured in a short time by heating at a low temperature of 60 to 100 ° C., and can continuously develop strength after drying by heating to medium to high temperatures. It is effective in labor saving and efficiency. Further, since it is cementless, improvement in corrosion resistance can be expected.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F27D 1/10 1/16 FR (72) Inventor Naoto Higuchi 5-43 Shinonome Town, Izumiotsu City, Osaka Prefecture −211 (72) Inventor Chiyomi Aoyama 3-3-7 Sakuranocho Nishi, Sakai City, Osaka Prefecture

Claims (2)

[Claims] 1. 10 to 30% by weight of fine powder of 44 μm or less
100% by weight of a refractory aggregate having a controlled particle size, and 0.1% of a phenol resin having a softening point of 70 to 200 ° C. as a thermosetting agent.
0.1 to 10% by weight of a polysaccharide-based heat-sensitive gelling agent and 0.1 to 10% by weight of a poorly soluble sodium phosphate and / or condensed aluminum phosphate as a poorly soluble binder serving as a binder. Thermosetting amorphous refractory containing 5 to 3% by weight. 2. 10 to 30% by weight of fine powder of 44 μm or less
100% by weight of a refractory aggregate having a controlled particle size, and 0.1% of a phenol resin having a softening point of 70 to 200 ° C. as a thermosetting agent.
0.1 to 10% by weight of a polysaccharide-based heat-sensitive gelling agent and 0.1 to 10% by weight of a poorly soluble sodium phosphate and / or condensed aluminum phosphate as a poorly soluble binder serving as a binder. Water is added to a thermosetting amorphous refractory compounded with 5 to 3% by weight, kneaded and poured, and then 60 to 100
A refractory construction method that heats and cures at ℃.