Long-term high-temperature-resistant insulating castable and preparation method and application thereof

Abstract

The application relates to a long-term high-temperature-resistant insulating casting material and a preparation method and application thereof, wherein the insulating casting material comprises 50-100 parts of a solvent, 5-15 parts of an acrylic resin, 5-20 parts of aluminum oxide, 20-70 parts of silicon dioxide, 20-80 parts of silicon carbide, 5-10 parts of calcium oxide, 1-5 parts of sodium oxide and 15-20 parts of potassium oxide; the specific amount of the acrylic resin, fillers, additives and the solvent are compounded, the obtained solidification product has excellent high-temperature resistance and insulation performance, and can meet the requirement of stable insulation performance under high-temperature conditions.

Description

Technical Field

[0001] This invention relates to the field of castable technology, and in particular to a long-term high-temperature resistant insulating castable, its preparation method, and its application. Background Technology

[0002] Refractory castables (also known as high-temperature castables) are granular and powdered materials made from refractory / high-temperature resistant substances, with the addition of a certain amount of binder and water. They possess high fluidity, are suitable for casting, and are monolithic refractory materials that harden without heating. They are typically cast on-site using methods such as pouring, vibration, or tamping, and can also be made into precast components. Compared to shaped refractory products, monolithic refractory materials, represented by refractory castables, have advantages such as shorter processing flow, lower production energy consumption and cost, ease of use, wide applicability, good integrity, and better performance. Therefore, they have experienced rapid development worldwide, and their proportion in the entire refractory materials industry is increasing. Today, refractory castables are widely used in high-temperature equipment in industries such as metallurgy, building materials, power, and chemicals.

[0003] Refractory castables are a major type of unshaped refractory materials. For example, CN103396126A provides a refractory castable that uses silica (sol) gel as a binder and tartaric acid as a setting accelerator. It is made of corundum, activated alumina micro powder, 96% silica micro powder, pure calcium aluminate cement, steel fiber, and additives. It has good fluidity, stable and relatively short curing time, high demolding strength at medium and high temperatures, and good thermal shock resistance.

[0004] CN102491771A discloses a composite refractory castable, which uses corundum and / or bauxite, mullite, and silicon carbide as granular materials; cement, alumina powder, and silica fume as matrix materials; and adds phosphate decoction agent, organic acid retarder, diluted silica sol, and water. The preparation method is as follows: weigh each solid raw material according to the formula, mix them, and pour them into a mixer; then add the formula amount of silica sol and water; stir, pour, transport, pour, vibrate, demold, cure, and bake to obtain the composite refractory castable. The refractory castable prepared by this invention has normal setting and rapid hardening, and possesses excellent high purity, high temperature resistance, low porosity, and erosion resistance, making it suitable for lining parts in high-temperature kilns that require high temperature resistance, erosion resistance, or high-temperature wear resistance.

[0005] However, with the development of industrial technology, the performance requirements for materials are becoming increasingly stringent, especially regarding insulation performance at high temperatures. The insulation properties of traditional refractory castables often decline sharply at high temperatures, limiting their application in many fields. Therefore, developing a castable that can maintain stable insulation performance under high-temperature conditions is of paramount importance. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a long-term high-temperature resistant insulating castable, its preparation method, and its application. The insulating castable is formulated with acrylic resin possessing excellent high-temperature stability and insulating properties, compounded with specific amounts of fillers, additives, and solvents. The fillers increase the mechanical strength and thermal conductivity of the castable, while the solvents and additives control the curing speed and flowability. The resulting cured product exhibits both excellent high-temperature resistance and insulating properties, meeting the requirement of maintaining stable insulation performance under high-temperature conditions.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides an insulating casting material, which, by weight, comprises 50-100 parts of solvent, 5-15 parts of acrylic resin, 5-20 parts of aluminum oxide, 20-70 parts of silicon dioxide, 20-80 parts of silicon carbide, 5-10 parts of calcium oxide, 1-5 parts of sodium oxide, and 15-20 parts of potassium oxide.

[0009] The solvent is 50-100 parts, for example 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts or 95 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0010] The acrylic resin is 5-15 parts, for example 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts or 14 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0011] The aluminum oxide is 5-20 parts, for example 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts or 18 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0012] The silicon dioxide is 20-70 parts, for example 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or 65 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0013] The silicon carbide is 20-80 parts, for example 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts or 75 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0014] The calcium oxide is 5-10 parts, for example 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts or 9.5 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0015] The sodium oxide is 1-5 parts, for example 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0016] The potassium oxide is 15-20 parts, for example 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts or 19.5 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0017] The insulating castable provided by this invention comprises solvents, acrylic resins, alumina, silicon dioxide, silicon carbide, calcium oxide, sodium oxide, and potassium oxide in specific proportions. The compounding of these multiple components gives the insulating castable excellent high-temperature resistance and insulation properties, making it widely applicable as linings or protective layers for furnaces, kilns, and other high-temperature equipment. In this insulating castable, acrylic resin exhibits good transparency and chemical stability, while also providing excellent high-temperature stability and insulation properties. The combination of alumina, silicon dioxide, and silicon carbide is added as a filler, which has a low coefficient of thermal expansion, reducing dimensional deformation caused by temperature changes and increasing the mechanical strength and thermal conductivity of the castable. The combination of calcium oxide, sodium oxide, and potassium oxide is used as an additive; these three components work together to regulate the melting point of the composition, improving the high-temperature resistance of the castable. Furthermore, this invention uses the addition of solvents and additives to control the curing speed and flowability of the castable, meeting the application requirements in high-temperature industries.

[0018] Preferably, by weight, the casting material comprises 50-100 parts solvent, 5-15 parts acrylic resin, 8-10 parts aluminum oxide, 55-65 parts silicon dioxide, 60-80 parts silicon carbide, 5-10 parts calcium oxide, 1-5 parts sodium oxide, and 15-20 parts potassium oxide.

[0019] As a preferred embodiment of the present invention, the filler comprises 8-10 parts of aluminum oxide (e.g., 8.2, 8.5, 8.8, 9, 9.2, 9.5, 9.8, etc.), 55-65 parts of silicon dioxide (e.g., 56, 57, 58, 59, 60, 61, 62, 63, 64, etc.), and 60-80 parts of silicon carbide (e.g., 62, 64, 66, 68, 70, 72, 74, 76, 78, etc.). By using fillers with specific compositions, the compactness of the material is improved, thereby increasing the high-temperature resistance of the material and enabling the insulating castable to have superior insulation performance during continuous operation at high temperatures.

[0020] Preferably, the boiling point of the solvent is below 65°C, for example, it can be 60°C, 55°C, 50°C, 45°C, 40°C, 35°C, 30°C, etc.

[0021] Preferably, the solvent includes any one or a combination of at least two of methanol, diethyl ether, acetone, dichloroethane, and chloroform.

[0022] As a preferred technical solution of the present invention, the solvent is a low-boiling-point solvent, which evaporates quickly during the curing process, and the curing stage takes a short time, thereby reducing energy consumption and lowering costs.

[0023] Preferably, the particle size of the silica is 10-50 μm, for example, it can be 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, etc.; more preferably, it is 14-24 μm, for example, it can be 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, etc.

[0024] As a preferred embodiment of the present invention, when silica with a specific particle size range is used, the insulating castable has better mechanical strength and thermal conductivity. Excessively large particle size can lead to cracking and powdering in the cured castable; excessively small particle size can result in an excessively high coefficient of thermal expansion, requiring excessive secondary material replenishment and cumbersome operation.

[0025] Preferably, the particle size of the aluminum oxide and silicon carbide is independently 1-10 μm, for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, etc.; more preferably 5-8 μm, for example, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, etc.

[0026] Preferably, the calcium oxide has a particle size of 0.1-5 μm, such as 0.2 μm, 0.5 μm, 0.8 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, etc.; more preferably, it has a particle size of 0.5-1.5 μm, such as 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, etc.

[0027] Preferably, the particle size of sodium oxide and potassium oxide is 1-10 μm, for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, etc.; more preferably, it is 5-8 μm, for example, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, etc.

[0028] Preferably, the viscosity of the insulating casting material at 25°C is 5000-8000 mPa·s, for example, it can be 5500 mPa·s, 6000 mPa·s, 6500 mPa·s, 7000 mPa·s, 7500 mPa·s, etc.

[0029] Preferably, the melting temperature of the insulating castable after curing is 400-500℃, for example, it can be 410℃, 420℃, 430℃, 440℃, 450℃, 460℃, 470℃, 480℃, 490℃, etc.

[0030] In a second aspect, the present invention provides a method for preparing the insulating castable according to the first aspect, the method comprising the following steps:

[0031] The insulating casting material is obtained by mixing solvent, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide.

[0032] Thirdly, the present invention provides an application of the insulating castable according to the first aspect in high-temperature industries.

[0033] Fourthly, the present invention provides a refractory material obtained by curing an insulating castable as described in the first aspect.

[0034] Preferably, the curing temperature is 25-700℃, for example, it can be 30℃, 40℃, 50℃, 60℃, 80℃, 100℃, 200℃, 300℃, 400℃, 500℃, 600℃, etc.

[0035] Preferably, the curing time is 0.5-15 hours, for example, it can be 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, etc.

[0036] Compared with the prior art, the present invention has at least the following beneficial effects:

[0037] This invention provides a long-term high-temperature resistant insulating castable, its preparation method, and its application. The insulating castable is formulated by compounding specific amounts of solvent, acrylic resin, filler, and additives, resulting in a cured product that possesses both excellent high-temperature resistance and insulation properties. It meets the requirement of maintaining stable insulation performance under high-temperature conditions, maintaining a volume resistivity of 1×10⁻⁶ after 7 days of continuous operation at 400°C. 8 With an electrical strength of Ω·m or higher and an electrical strength of 8 Mv / m or higher, in some preferred embodiments, the volume resistivity of the cured insulating castable is maintained at 1 × 10⁻⁶. 13 Ω·m or higher, and electrical strength maintained above 12 Mv / m. Detailed Implementation

[0038] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0039] In the following specific embodiments of the present invention, the materials involved are as follows:

[0040] 1. Solvent

[0041] Methanol, purchased from Fuchen (Tianjin) Chemical Reagent Co., Ltd.

[0042] 2. Acrylic resin

[0043] S59105, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0044] 3. Packing material

[0045] Aluminum oxide, ZTLLDAO, Yangzhou Zhongtianli New Material Co., Ltd., particle size 5-8μm, α-Al2O3

[0046] Silica, WD0287, Hubei Wande Chemical Co., Ltd., with a particle size of 14-24μm, is crystalline silica.

[0047] Silica, LH102, Guangzhou Tianjia Biotechnology Co., Ltd., crystalline silica with a particle size of 30μm.

[0048] Silicon carbide, XHL3282, Hubei Xinhongli Chemical Co., Ltd., with a particle size of 5-8μm, hexagonal crystal system.

[0049] 4. Additives

[0050] Calcium oxide, CD108205, Guangzhou Hewei Pharmaceutical Technology Co., Ltd., particle size 5-8μm, trigonal crystal system.

[0051] Sodium oxide, Wuhan Jixin Yibang Biotechnology Co., Ltd., 99% purity, particle size 5-8μm, ionic crystal.

[0052] Potassium oxide, P118877, Shanghai Xinyu Biotechnology Co., Ltd., particle size 5-8μm, cubic crystals

[0053] Example 1

[0054] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0055] The silica particles have a diameter of 14-24 μm;

[0056] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0057] Example 2

[0058] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 5 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0059] The silica particles have a diameter of 14-24 μm;

[0060] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0061] Example 3

[0062] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 20 parts silicon dioxide, 80 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0063] The silica particles have a diameter of 14-24 μm;

[0064] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0065] Example 4

[0066] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 20 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0067] The silica particles have a diameter of 14-24 μm;

[0068] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0069] Example 5

[0070] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 5 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0071] The silica particles have a diameter of 14-24 μm;

[0072] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0073] Example 6

[0074] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 10 parts calcium oxide, 1 part sodium oxide, and 15 parts potassium oxide.

[0075] The silica particles have a diameter of 14-24 μm;

[0076] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0077] Example 7

[0078] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 20 parts potassium oxide.

[0079] The silica particles have a diameter of 14-24 μm;

[0080] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0081] Example 8

[0082] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0083] The silica particle size is 30μm;

[0084] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0085] Comparative Example 1

[0086] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 60 parts aluminum oxide, 90 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0087] The silica particles have a diameter of 14-24 μm;

[0088] The method for preparing the insulating castable includes mixing methanol, acrylic resin, aluminum oxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0089] Comparative Example 2

[0090] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 16.7 parts aluminum oxide, 133.3 parts silicon carbide, 10 parts calcium oxide, 5 parts sodium oxide, and 15 parts potassium oxide.

[0091] The silica particles have a diameter of 14-24 μm;

[0092] The method for preparing the insulating castable includes mixing methanol, acrylic resin, aluminum oxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide to obtain the insulating castable.

[0093] Comparative Example 3

[0094] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 20 parts aluminum oxide, 65 parts silicon dioxide, and 95 parts silicon carbide.

[0095] The silica particles have a diameter of 14-24 μm;

[0096] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide and silicon carbide to obtain the insulating castable.

[0097] Comparative Example 4

[0098] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 7.5 parts sodium oxide, and 22.5 parts potassium oxide.

[0099] The silica particles have a diameter of 14-24 μm;

[0100] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, sodium oxide and potassium oxide to obtain the insulating castable.

[0101] Comparative Example 5

[0102] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 12 parts calcium oxide, and 18 parts potassium oxide.

[0103] The silica particles have a diameter of 14-24 μm;

[0104] The method for preparing the insulating castable includes: mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide and potassium oxide to obtain the insulating castable.

[0105] Comparative Example 6

[0106] An insulating castable, by weight, comprises 100 parts methanol, 10 parts acrylic resin, 10 parts aluminum oxide, 60 parts silicon dioxide, 80 parts silicon carbide, 20 parts calcium oxide, and 10 parts sodium oxide.

[0107] The silica particles have a diameter of 14-24 μm;

[0108] The method for preparing the insulating castable includes mixing methanol, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide and sodium oxide to obtain the insulating castable.

[0109] The insulating casting materials from Examples 1-8 and Comparative Examples 1-6 were vacuum heated at 60°C for 1 hour, and then heated at 200°C for 12 hours to obtain the cured products of the insulating casting materials.

[0110] The cured product was subjected to the following tests:

[0111] 1. Appearance

[0112] By visually inspecting the cured product of the insulating castable, one can determine whether there are cracks, perforations, blistering, or powdering on its surface.

[0113] 2. Volume resistivity

[0114] The tests were conducted in accordance with GB / T 1410-2006 Test Methods for Volume Resistivity and Surface Resistivity of Solid Insulating Materials.

[0115] 3. Electrical strength

[0116] The test was conducted in accordance with GB / T 1408-2006 Test Method for Electrical Strength of Insulating Materials.

[0117] The test results are shown in Table 1.

[0118] Table 1

[0119]

[0120]

[0121] As shown in Table 1, the insulating casting materials provided in Examples 1-8 of this invention include specific amounts of solvent, acrylic resin, filler, and additives. Their cured products possess both excellent high-temperature resistance and insulation properties, meeting the requirement of maintaining stable insulation performance under high-temperature conditions. After continuous operation at a working temperature of 400℃ for 7 days, the volume resistivity remains at 1×10⁻⁶. 8 With an electrical strength of Ω·m or higher and an electrical strength of 8 Mv / m or higher, in some preferred embodiments, the volume resistivity of the cured insulating castable is maintained at 1 × 10⁻⁶. 13 Ω·m or higher, and electrical strength maintained above 12 Mv / m.

[0122] By comparing Example 1 with Comparative Examples 1-6, it can be seen that when silica is not added to the filler, the surface roughness of the insulating castable is aggravated after curing, and cracking and powdering are severe. The volume resistivity and electrical strength are low after high-temperature operation. When no additives are added to the insulating castable or one component is missing from the additives, its melting is poor, molding is difficult, the surface cracks severely after curing, accompanied by severe powdering, and the high-temperature resistance and insulation performance are poor.

[0123] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A refractory material, characterized in that, The refractory material is obtained by curing an insulating castable. The curing temperature is 80-200℃; The curing time is 0.5-15 h; By weight, the insulating casting material comprises 50-100 parts solvent, 5-15 parts acrylic resin, 5-20 parts aluminum oxide, 20-70 parts silicon dioxide, 20-80 parts silicon carbide, 5-10 parts calcium oxide, 1-5 parts sodium oxide, and 15-20 parts potassium oxide. The insulating casting material is obtained by mixing solvent, acrylic resin, aluminum oxide, silicon dioxide, silicon carbide, calcium oxide, sodium oxide and potassium oxide; The solvent includes any one or a combination of at least two of methanol, diethyl ether, acetone, and chloroform; The viscosity of the insulating castable at 25°C is 5000-8000 mPa·s.

2. The refractory material according to claim 1, characterized in that, By weight, the insulating casting material comprises 50-100 parts solvent, 5-15 parts acrylic resin, 8-10 parts aluminum oxide, 55-65 parts silicon dioxide, 60-80 parts silicon carbide, 5-10 parts calcium oxide, 1-5 parts sodium oxide, and 15-20 parts potassium oxide.

3. The refractory material according to claim 1, characterized in that, The silica has a particle size of 10-50 μm.

4. The refractory material according to claim 3, characterized in that, The silica has a particle size of 14-24 μm.

5. The refractory material according to claim 1, characterized in that, The particle size of the aluminum oxide and silicon carbide is independently 1-10 μm.

6. The refractory material according to claim 5, characterized in that, The particle size of the aluminum oxide and silicon carbide is independently 5-8 μm.

7. The refractory material according to claim 1, characterized in that, The calcium oxide has a particle size of 0.1-5 μm.

8. The refractory material according to claim 7, characterized in that, The calcium oxide has a particle size of 0.5-1.5 μm.

9. The refractory material according to claim 1, characterized in that, The particle size of the sodium oxide and potassium oxide is independently 1-10 μm.

10. The refractory material according to claim 9, characterized in that, The particle size of the sodium oxide and potassium oxide is independently 5-8 μm.

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