WO2012081373A1 - Béton réfractaire - Google Patents

Béton réfractaire Download PDF

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Publication number
WO2012081373A1
WO2012081373A1 PCT/JP2011/077141 JP2011077141W WO2012081373A1 WO 2012081373 A1 WO2012081373 A1 WO 2012081373A1 JP 2011077141 W JP2011077141 W JP 2011077141W WO 2012081373 A1 WO2012081373 A1 WO 2012081373A1
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WO
WIPO (PCT)
Prior art keywords
fiber
mass
polyethylene
moisture
refractory
Prior art date
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PCT/JP2011/077141
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English (en)
Japanese (ja)
Inventor
浩一 西
西　敬
大輔 今藤
Original Assignee
黒崎播磨株式会社
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Publication of WO2012081373A1 publication Critical patent/WO2012081373A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F27D1/0009—Comprising ceramic fibre elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/10—Monolithic linings; Supports therefor
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5212—Organic
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/526—Fibers characterised by the length of the fibers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5264—Fibers characterised by the diameter of the fibers

Definitions

  • the present invention relates to an amorphous refractory material that includes organic fibers and is constructed by adding water.
  • amorphous refractories are used for the lining of various molten metal containers such as ladle, tundish, blast furnace feed, or vacuum degassing furnace.
  • molten metal containers such as ladle, tundish, blast furnace feed, or vacuum degassing furnace.
  • one construction form of the irregular refractory will be described with reference to the pouring construction of the ladle lining.
  • the construction body is dried by heating it with a burner or microwave. During heating, water vapor is generated from the inside of the construction body, and a crack or explosion may occur in the construction body due to the water vapor pressure. If the construction body is dried for a long time at a moderate heating rate, the occurrence of explosion can be suppressed, but shortening of the drying time is desired from the viewpoint of improving the operating rate of the ladle.
  • Patent Document 1 since the water vapor pressure inside the construction body rises rapidly from around 200 ° C., the organic fiber is preferably melted at 180 ° C. or less before the water vapor pressure rises rapidly.
  • Patent Document 1 mentions vinylon, polyethylene, polypropylene, and the like as materials having a low melting point, and suggests that vinylon fibers are most preferable.
  • Patent Documents 2 and 3 disclose specific examples of amorphous refractories in which polyethylene fibers are selected as organic fibers for preventing explosions (Comparison of Invention Examples 2 and 3 of Patent Document 2 and Patent Document 3). See Example 3).
  • Patent Document 3 describes that the moisture content of the polyethylene fiber is zero mass% (see the upper right column on page 2 of Patent Document 3 and Table 2).
  • Patent Document 4 refers to low density polyethylene having a density of 0.93 g / cm 3 or less as an organic fiber material for explosion prevention.
  • polyethylenes low density polyethylene is known to have a melting point as low as 100 to 135 ° C.
  • JP-A-61-10079 Japanese Patent Laid-Open No. 3-83869 JP-A-3-265572 JP 2008-120669 A
  • Organic fiber is not immediately blended into an irregular refractory after production, but until it is blended as part of an irregular refractory after transportation and storage of the irregular refractory.
  • a standby state is set.
  • the organic fiber is accommodated in the flexible container bag.
  • the flexible container bag allows moisture to pass, moisture such as moisture in the atmosphere can adhere to the organic fiber.
  • moisture such as atmospheric moisture can adhere to the organic fiber during the standby state.
  • the above transportation to standby usually takes a total of several days or more.
  • the remainder of the amorphous refractory other than organic fibers contains refractory powder and a binder.
  • a hydraulic binder such as alumina cement is usually used as the binder.
  • the refractory powder includes a digestible material (hereinafter referred to as a digestible material) such as a magnesia material, a calcia material, or a dolomite material, or an ultrafine powder such as silica flour.
  • digestion refers to a phenomenon in which a raw material reacts with water to produce a hydroxide.
  • the organic fiber to which moisture has adhered is at least one of a hydraulic binder, a digestible raw material, and an ultrafine powder. It is in contact with one of them and can be a moisture source for them.
  • the manufactured irregular refractory is not immediately subjected to construction.
  • a prospective order is made to an irregular-shaped refractory manufacturing plant, and after shipment of the irregular-shaped refractory from the manufacturing plant, it is packed in a flexible container bag before adding water to the construction site for use in construction. For example, a stock period of about 5 days to several months passes.
  • the above-described hydraulic binder, digestible raw material, or ultra fine powder deteriorates due to the moisture contained in the organic fiber. That is, when the hydraulic binder comes into contact with moisture and the hydration reaction is partially completed before the construction, the reactivity after the construction is lowered and the strength imparting function of the hydraulic binder is lowered. In addition, when digestible raw material comes into contact with moisture and digests, volumetric expansion causes distorted properties and causes a decrease in strength after construction. Further, it was found that when the ultrafine powder is in contact with moisture, the surface is hydroxylated or a change with time is caused and the strength after construction is reduced.
  • the explosion of the construction body occurs when the internal water vapor pressure of the construction body exceeds the strength of the construction body.
  • Patent Documents 1 to 4 disclose test results showing the explosion prevention effect of organic fibers recommended by each. However, each test was conducted in a laboratory, and a sample of an amorphous refractory was prepared. Since this is immediately kneaded with water for evaluation, the effects of the stock period and the like in the actual process are not reflected. Until now, it has not been known that the moisture content of organic fibers becomes a factor that hinders the explosion prevention effect.
  • the vinylon fiber used in Patent Document 1 contains a lot of moisture.
  • the official moisture content of the vinylon fiber is 5% by mass. For this reason, especially when the said stock period is long etc., the vinylon fiber cannot fully exhibit the explosion prevention effect.
  • the official moisture content of organic fibers refers to the water content inside the tissue of organic fibers.
  • Polyethylene fibers used in Patent Documents 2 to 4 have an official moisture content of zero mass%, but as described above, moisture may adhere to the fiber surface during storage. For this reason, the moisture content of the polyethylene fiber is not necessarily zero mass%. Explosion may occur due to moisture adhering to the fiber surface.
  • the moisture content of the organic fiber refers to the sum of the moisture content inside the tissue of the organic fiber and the moisture content adhering to the surface of the organic fiber.
  • An object of the present invention is to provide an amorphous refractory material that is unlikely to crack or explode during drying.
  • an amorphous refractory containing organic fibers and added with water has a water content of less than 3% by mass as organic fibers, and oil is attached to the surface.
  • An amorphous refractory characterized by using a polyethylene fiber is provided.
  • the organic fiber used in the present invention has a low moisture content of less than 3% by mass, and it is difficult for moisture to adhere to the fiber surface by adhering oil. For this reason, the organic fiber used in the present invention is less likely to cause deterioration of the remainder other than the organic fiber in the amorphous refractory even during the stock period. Accordingly, it is possible to prevent a decrease in strength of the construction body in the drying process.
  • the organic fiber used in the present invention is made of polyethylene.
  • Polyethylene has a particularly low melting point among organic fibers whose official moisture content can satisfy the moisture content defined in the present invention. For this reason, since the organic fiber used by this invention melts early after drying starts and forms a vent hole, it is excellent also in the effect which relieve
  • the amorphous refractory includes a refractory powder, a binder, and an organic fiber.
  • the amorphous refractory contains at least one of a digestible raw material as a refractory powder, an ultrafine powder as a refractory powder, and a hydraulic binder as a binder. Is particularly significant.
  • the digestible material examples include one or more selected from magnesia materials such as electrofused magnesia, magnesia-silica materials such as olivine, calcia materials such as calcia clinker, and dolomite materials such as dolomite clinker. Can be mentioned.
  • magnesia materials such as electrofused magnesia
  • magnesia-silica materials such as olivine
  • calcia materials such as calcia clinker
  • dolomite materials such as dolomite clinker.
  • the ultrafine powder examples include those having an average particle diameter of less than 10 ⁇ m, such as amorphous silica ultrafine powder such as silica flour, alumina ultrafine powder such as calcined alumina, clay, and titania ultrafine powder.
  • Silica flour is particularly susceptible to deterioration due to moisture.
  • the digestible raw material mentioned above shall be excluded from the concept of ultrafine powder.
  • the blending amount of the ultrafine powder is 5% by mass or more in a ratio of the refractory powder, there is a concern about deterioration due to moisture contained in the organic fiber.
  • the average particle diameter means a volume average particle diameter corresponding to the median value of the particle size distribution measured by a laser diffraction / scattering particle size distribution measuring apparatus.
  • Examples of the hydraulic binder include alumina cement, hydraulic alumina ( ⁇ -alumina), Portland cement, light-burned magnesia, and the like.
  • alumina cement hydraulic alumina ( ⁇ -alumina)
  • ⁇ -alumina hydraulic alumina
  • Portland cement Portland cement
  • light-burned magnesia and the like.
  • the blending amount of the hydraulic binder is 1% by mass or more with respect to the refractory powder, there is a concern about deterioration due to the moisture contained in the organic fiber.
  • the organic fiber a polyethylene fiber having a water content of less than 3% by mass and having an oil attached to the surface is used.
  • the moisture content of the organic fiber is preferably 2% by mass or less, and more preferably 1.5% by mass or less.
  • polyethylene is a concept including not only a homopolymer of ethylene but also a copolymer of ethylene and a comonomer.
  • Moisture content (mass%) (total mass of organic fibers including moisture ⁇ mass of organic fibers excluding moisture) / mass of organic fibers excluding moisture ⁇ 100.
  • the polyethylene fiber has an official moisture content of zero mass%, that is, no moisture is contained in the fiber structure. Therefore, the moisture content of less than 3 mass% means that the moisture content attached to the surface of the polyethylene fiber is 3 It means less than mass%.
  • organic fibers having a low official moisture content include polypropylene fibers, polyvinyl chloride fibers, and polyester fibers in addition to polyethylene fibers, but polyethylene fibers have the lowest melting point. For this reason, it can melt
  • the melting point of the polyethylene fiber is, for example, 100 to 135 ° C.
  • oil component examples include mineral oil, castor oil and other vegetable oils, isotridecyl stearate, POE oleyl ether, POE nonyl phenyl ether, lauryl sulfonate sodium salt, POE lauryl ether phosphate potassium salt and the like. These may be attached singly or in combination of two or more.
  • Oil has the effect of preventing moisture in the atmosphere from adhering to the surface of the polyethylene fiber. For this reason, the polyethylene fiber to which the oil component is attached is less likely to cause deterioration of the remainder other than the organic fiber in the amorphous refractory, even after a stock period exposed to the atmosphere before blending into the amorphous refractory. As a result, it is possible to prevent a decrease in strength of the construction body during drying.
  • the amount of oil attached to the polyethylene fiber is not particularly limited, but is preferably 1 to 5% by mass.
  • the oil adhesion amount is 1% by mass or more, the effect of preventing moisture from adhering to the fiber surface can be further ensured, and by suppressing the oil content to 5% by mass or less, the fiber caused by the oil component can be prevented. Deterioration of handleability and workability can be prevented.
  • Oil content (mass%) defined as mass of oil adhering to organic fiber / total mass of organic fiber including oil content ⁇ 100.
  • the method for producing the polyethylene fiber used in the present invention is not particularly limited. For example, after melt spinning polyethylene and thermally stretching it, an oil adhesion step can be provided to continuously obtain polyethylene fibers with the oil attached.
  • the polyethylene fiber of the present invention can also be obtained by producing a polyethylene fiber to which no oil is attached as usual, and then attaching the oil. In this case, it is preferable to carry out drying to reduce the moisture content of the fiber to less than 3% by mass before adhering the oil.
  • the oil adhesion method include coating, spraying, or dipping.
  • Polyethylene is roughly classified into high-density polyethylene (HDPE) and low-density polyethylene (LDPE) depending on the density, and the official moisture content is zero mass% for both. Of these, low density polyethylene is preferred in the present invention. According to JISK6922, low density polyethylene refers to polyethylene having a density of 0.910 to 0.929 g / cm 3 , but in this specification, it refers to polyethylene having a density of 0.929 g / cm 3 or less. High density polyethylene refers to polyethylene having a density higher than that of low density polyethylene.
  • Low density polyethylene has a low melting point due to its low density. For this reason, since the formation of the air holes in the drying process can be accelerated, the effect of reducing the internal water vapor pressure of the construction body is particularly excellent.
  • the melting point of low density polyethylene is 90 to 135 ° C.
  • low density polyethylene fibers are softer and weaker than high density polyethylene fibers, so if the amount of water added to the amorphous refractory is the same, the density of mud is higher than when high density polyethylene fibers are used. There is a tendency to improve fluidity. The higher the fluidity of the mud, the more it can be filled into the space defined by the mold without any gaps.
  • the low density polyethylene is classified into a high pressure method low density polyethylene and a linear low density polyethylene (LLDPE), and in the present invention, a linear low density polyethylene is preferable.
  • Linear low-density polyethylene is excellent in tensile strength among low-density polyethylene, and thus is difficult to tear during kneading. If the organic fibers are torn off during kneading, the individual ventilation holes formed in the drying process are naturally shortened, so that the air permeability of the construction body is lowered. On the other hand, if the organic fiber is difficult to tear at the time of kneading, the air permeability of the construction body can be prevented from being lowered, so that the effect of preventing explosion of the organic fiber can be exhibited.
  • the blending amount of this polyethylene fiber will be determined by the common technical knowledge of those skilled in the art.
  • the blending amount of the present polyethylene fiber can be 0.01 to 1% by mass as the outer coating with respect to 100% by mass of the refractory powder, like the conventional organic fiber.
  • the diameter of the polyethylene fiber is not particularly limited.
  • the diameter can be, for example, 1 to 100 ⁇ m.
  • the diameter is 1 ⁇ m or more, the ventilation resistance of individual ventilation holes formed in the construction body is particularly small.
  • the diameter is 100 ⁇ m or less, the number of fibers can be sufficiently secured even with an addition amount of 0.01 to 1% by mass, and the effect of reducing the air permeability of the construction body is particularly good.
  • the diameter is preferably 1 to 50 ⁇ m.
  • the length of the polyethylene fiber is not particularly limited.
  • the length can be, for example, 1 to 20 mm.
  • an increase in cutting cost can be suppressed and the continuity of the air holes is improved.
  • the length is 20 mm or less, the fluidity of the mud formed by kneading the irregular refractory with water is less likely to occur.
  • Refractory powder alumina materials such as fused alumina and bauxite, siliceous materials such as silica, alumina-silica materials such as kyanite, andalusite and chamotte, zircon materials, silicon carbide, and carbonaceous materials
  • alumina materials such as fused alumina and bauxite
  • siliceous materials such as silica
  • alumina-silica materials such as kyanite, andalusite and chamotte
  • zircon materials silicon carbide
  • carbonaceous materials Of course, raw materials and the like that do not have digestive properties may be included.
  • the binder may include organic binders such as pitch, tar, and resin, silica sol, silicate, phosphate, and the like that do not have hydraulic properties.
  • a binder is not essential.
  • the amorphous refractory of the present invention may not contain a binder.
  • the amorphous refractory includes one or more additives selected from, for example, a dispersant, aluminum lactate, metal powder, a thickener, an antioxidant, a low melting point glass, and a curing time adjusting agent.
  • a dispersant aluminum lactate
  • metal powder metal powder
  • a thickener an antioxidant
  • a low melting point glass a low melting point glass
  • a curing time adjusting agent a curing time adjusting agent
  • the construction method of this irregular refractory is not particularly limited as long as it is a method of construction by adding water.
  • a casting method there are a casting method, a vibrating troweling method, a wet spraying method, and a dry spraying method.
  • the irregular refractory is kneaded with water in advance to form a mud.
  • the dry-type spraying method the amorphous refractory is directed to the nozzle by airflow through the transport pipe, and water is added to at least one of the transport pipe and the nozzle. In some cases, water is added at several points on the transfer pipe.
  • a drying process for reducing the moisture by heating is essential.
  • Table 1 shows specific examples of irregular refractories.
  • seawater magnesia corresponds to the digestible raw material
  • silica flour and calcined alumina correspond to the ultrafine powder
  • alumina cement corresponds to the hydraulic binder. Based on the formulation in Table 1, various organic fibers were changed.
  • Table 2 shows the moisture content, the oil content, and the evaluation results of the amorphous refractory, in addition to those used as organic fibers in the composition of Table 1.
  • All the organic fibers in Table 2 have a common shape so that the diameter is 10 to 20 ⁇ m and the length is 3 to 5 mm.
  • the absolute dry mass of the sample is to dry the sample with hot air at 105 ° C. ⁇ 2 ° C. The mass that is left in the machine and made constant weight. The number of tests was two times, and the average value is shown in Table 2.
  • Oil content (mass%) (mass of tray after oil extraction ⁇ mass of tray before oil extraction) / sample collection amount ⁇ 100” Note that the number of tests was twice, and the average value is shown in Table 2. It was.
  • Evaluation was performed as follows. First, the organic fiber is left for 5 days in a situation where moisture can adhere to the surface, specifically, in a space with a humidity of 75 to 85%. Next, the organic fiber is mixed with the remaining composition of Table 1 to obtain an amorphous refractory. The obtained amorphous refractory is stored in a vinyl bag and left for one week. Next, 6% by mass of water is added to 100% by mass of the amorphous refractory and kneaded to form a mud. The obtained slurry is poured into a mold, and after curing, a sample subjected to autoclave treatment at 150 ° C. for 6 hours is used as a measurement target.
  • Curing strength was evaluated relative to the bending strength of the sample in four stages of x, ⁇ , ⁇ , and ⁇ . As the bending strength increases, the construction body can withstand a large internal water vapor pressure, so that explosion does not easily occur. The bending strength was measured in accordance with the provisions of JIS-R2553 using the sample as a measurement object.
  • the air permeability was evaluated relative to five levels of x, ⁇ , ⁇ , ⁇ , and ⁇ according to the air permeability of the sample. The greater the air permeability, the less likely the explosion will occur because water vapor is less likely to remain inside the construction body.
  • Q is the volume (cm 3 / sec) of air that permeated the sample per unit time, and was measured by an air leak tester (LS-1821 manufactured by Cosmo Keiki Co., Ltd.).
  • S is the cross-sectional area of the sample (cm 2 )
  • L is the thickness of the sample (cm)
  • P 1 is the pressure when air enters the sample (cmH 2 O)
  • P 2 is atmospheric pressure (cmH 2 O).
  • Example 1 uses a high density polyethylene fiber having a density of 0.94 g / cm 3. By attaching an oil component, the moisture content is small and the curing strength is excellent. Further, the air permeability is inferior to that of the low density polyethylene fibers of Examples 2 to 5, but is acceptable. For this reason, it can be said that it is excellent in the explosion prevention effect.
  • Example 2 uses low-density polyethylene as the polyethylene fiber, and has better air permeability than Example 1. Moreover, compared with Example 1, since there is little oil and there is much water
  • Examples 3 and 4 are obtained by increasing the oil content compared to Example 2, have a low water content, and are excellent in curing strength. From the results of Examples 2 to 4, it can be seen that the water content depends on the oil content.
  • Example 5 uses a linear low-density polyethylene fiber as the polyethylene fiber, and the air permeability is improved as compared with Example 4.
  • the reason for this is not clear, but it is presumed that linear low-density polyethylene fibers are superior in tensile strength among low-density polyethylenes, and are therefore difficult to tear during kneading. That is, since the organic fibers are difficult to tear when kneaded, the air permeability of the construction body can be prevented from being lowered, and the organic fiber explosion prevention effect can be exhibited.
  • Comparative Example 1 uses polyethylene fibers that do not contain oil, and has a low melting point, so that air permeability is acceptable, but because of its high water content, the curing strength is insufficient. For this reason, there is a concern of explosion in the construction. From comparison between Comparative Example 1 and Example 1, it can be seen that when the moisture content of the organic fiber is large, the curing strength of the construction body decreases. In order to prevent explosion, it can be said that the moisture content of the polyethylene fiber needs to be less than 3% by mass.
  • Comparative Example 2 uses low-density polyethylene fibers that do not contain oil, and has good air permeability. However, since the moisture content is large, the curing strength is insufficient and there is a concern of explosion.
  • Comparative Examples 3, 4, and 5 were made of polypropylene fiber, polyester fiber, and polyvinyl chloride fiber, respectively. It is bad and has a high probability of causing explosions.
  • Comparative Example 6 uses a vinylon fiber, and the vinylon fiber dissolves in warm water, but forms a skin on the surface of the construction body, so the air permeability is poor. Moreover, since vinylon fiber has much moisture content, its curing strength is small.

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  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
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  • Structural Engineering (AREA)
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  • Organic Chemistry (AREA)
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  • General Engineering & Computer Science (AREA)
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Abstract

L'invention porte sur un béton réfractaire qui n'a pas tendance à produire de craquelures ou d'explosions au séchage. Ce béton réfractaire comprenant des fibres organiques et formé par ajout d'eau est caractérisé en ce que la teneur en eau des fibres organiques est inférieure à 3 % en masse et en ce que des fibres de polyéthylène à la surface desquelles de l'huile est fixée sont utilisées.
PCT/JP2011/077141 2010-12-15 2011-11-25 Béton réfractaire WO2012081373A1 (fr)

Applications Claiming Priority (2)

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JP2010-279045 2010-12-15
JP2010279045A JP5656285B2 (ja) 2010-12-15 2010-12-15 不定形耐火物

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WO2012081373A1 true WO2012081373A1 (fr) 2012-06-21

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Citations (7)

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JPH0274569A (ja) * 1988-09-07 1990-03-14 Kawasaki Refract Co Ltd 不定形耐火物
JPH03265572A (ja) * 1990-03-14 1991-11-26 Kurosaki Refract Co Ltd キャスタブル耐火物
JPH0446065A (ja) * 1990-06-09 1992-02-17 Kurosaki Refract Co Ltd キャスタブル耐火物
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