A sealing material for a through hole and its application

Abstract

The present invention relates to a sealing material for a through-hole and its application, belonging to the technical field of sealing materials. The sealing material comprises a lightweight micro-expanding refractory slurry and a lightweight adhesive, and the two ends of the through-hole are sealed with the lightweight adhesive; the lightweight micro-expanding refractory slurry is diluted with water, and mixed evenly to obtain a viscous slurry with excellent flowability, wherein the weight of water is 45-55% of the weight of the lightweight micro-expanding refractory slurry, and the viscous slurry is poured into the middle of the through-hole, and solidified and formed in 50-90 minutes. The sealing material of the present invention can achieve excellent sealing, and can meet the Class A fire resistance requirements of the through-hole, and has no corrosive effect on the metal frame in contact.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing materials and relates to a sealing material for a through-hole and application thereof. Background Art

[0002] In order to meet the basic requirements of fire safety of offshore facilities, the through-holes need to be fire-resistant sealed. At present, compressed fiber cotton that can expand when exposed to water is generally used as a plugging material when plugging the two ends of the through-hole, and magnesium salt inorganic gelling materials are filled. The compressed fiber cotton needs a large area for drying and cutting; during construction, it is difficult to fill it completely because of the hard edges and corners. The filled magnesium salt inorganic gelling material is heavy, and the halogen-containing magnesium salt is easy to corrode the metal in contact. Patent CN 114409369 discloses a water-cured fire-resistant sealing material, which uses calcium oxide and calcium sulfate as gelling materials, compounded with sodium silicate or potassium silicate, and adds mineral fibers to increase strength and reduce cracking and shrinkage. However, mineral fibers are not easy to disperse in powders. At the same time, sodium silicate, potassium silicate, and sepiolite fibers are easy to absorb water, and become soft after absorbing water, affecting mechanical properties.

[0003] Therefore, it is necessary to design a sealing form with excellent performance, easy construction and low price, as well as matching refractory slurry and rubber according to the requirements and construction characteristics of fire-resistant sealing of offshore facility through-holes. Summary of the invention

[0004] The object of the present invention is to provide a sealing material for a through-hole and its application. The sealing material of the present invention can achieve excellent sealing performance, can meet the Class A fire resistance requirements of the through-hole, and has no corrosive effect on the metal frame it contacts.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A sealing material for a through hole, characterized in that the sealing material comprises a lightweight slightly expanded refractory slurry and a lightweight rubber material, wherein the lightweight slightly expanded refractory slurry comprises the following raw materials in parts by weight:

[0007] The preparation process of the modified mesoporous silica is as follows:

[0008] In parts by weight, 5 to 15 parts of mesoporous silica are placed in 40 to 60 parts of a polylysine solution having a mass fraction of 15 to 25%, stirred for 45 to 60 minutes, and after removing the solvent, vacuum dried at 95 to 105° C. for 8 to 14 hours. The dried solid is ball milled at a speed of 400 r / min for 35 minutes to obtain modified mesoporous silica;

[0009] The kaolin described herein is kaolin whose surface is treated with a silane coupling agent, and the specific treatment process is as follows:

[0010] The kaolin is placed in a silane coupling agent KH550 solution with a mass fraction of 10-15%, stirred for 5 hours, filtered and completely dried to obtain the kaolin with the surface treated with the silane coupling agent, wherein the solid-liquid ratio of the kaolin to the silane coupling agent solution is 1:20 g / mL;

[0011] The preparation process of the modified diatomite is as follows:

[0012] In parts by weight, 5 to 10 parts of diatomaceous earth are placed in liquid nitrogen for 25 to 35 minutes, taken out and ball-milled at a speed of 400 r / min for 35 minutes in a ball mill, and then 20 to 30 parts of stearic acid are added thereto, and the ball milling is continued for 30 to 40 minutes to obtain solid A. 5 to 8 parts of polyglutamic acid, 4 to 6 parts of alum and 10 to 20 parts of deionized water are added to solid A at room temperature, mixed evenly, and dried at 85° C. for 15 hours to obtain modified diatomaceous earth.

[0013] As a preferred technical solution of the present invention, the particle size of the hemihydrate calcium sulfate nanopowder is 50-200 nm, the average diameter of the calcium sulfate whiskers is 1-10 um, the average length is 50-250 um, the aspect ratio is >35, and the silicon-containing reinforcing filler is one or more of fly ash, kaolin, white carbon black, diatomaceous earth and quartz sand.

[0014] As a preferred technical solution of the present invention, the water reducer is one or both of a melamine-based water reducer and a polycarboxylic acid water reducer.

[0015] As a preferred technical solution of the present invention, the retarder is one or more of a protein retarder, an organic acid and a soluble salt thereof.

[0016] As a preferred technical solution of the present invention, the stabilizer is one or more of sodium carboxymethyl cellulose, hydroxypropyl methylcellulose, and polyvinyl alcohol.

[0017] As a preferred technical solution of the present invention, the defoaming agent is one or more of mineral oil, polyethylene glycol, and glycerol monooleate.

[0018] As a preferred technical solution of the present invention, the synthetic resin composition is butyl rubber and methyl vinyl silicone rubber in a mass ratio of (1-2):(1-3).

[0019] As a preferred technical solution of the present invention, the flame retardant is one or two of chlorinated paraffin and chloroether resin.

[0020] As a preferred technical solution of the present invention, the average particle size of the kaolin is 800-1500 mesh, the particle size of the diatomaceous earth is 400-800 mesh, and the particle size of the bentonite is 325-400 mesh.

[0021] An application of a sealing material for a through-hole, characterized in that, during the application, both ends of the through-hole are sealed with a lightweight rubber compound, a lightweight slightly-expanded refractory slurry is diluted with water, and mixed evenly to obtain a viscous slurry with excellent flow properties, wherein the weight of water is 45-55% of the weight of the lightweight slightly-expanded refractory slurry, and the viscous slurry is poured into the middle of the through-hole and solidified for 50-90 minutes.

[0022] The present invention achieves the sealing and fireproofing requirements of the through-hole by using different sealing materials at both ends and in the middle of the through-hole, and the middle part is sealed with a lightweight micro-expanded refractory slurry. The main gelling materials of the lightweight micro-expanded refractory slurry are hemihydrate calcium sulfate nanopowder and calcium sulfate whisker, which have the same chemical formula and a high degree of miscibility. Hemihydrate calcium sulfate is a granular nanocrystal, and the calcium sulfate dihydrate generated after hydration has high strength. The average length of the calcium sulfate whisker is 50-250um, the aspect ratio is large, and it can participate in the hydration process, so the structural stability and mechanical properties of the slurry after solidification can be enhanced.

[0023] Mesoporous silica has a stable structure and plays a skeletal supporting role for the lightweight micro-expanding refractory slurry as a whole. After modification, polylysine molecules contain a large number of amino functional groups, which can interact with a variety of substances, such as hydrogen bonds, electrostatic effects, etc., thereby enhancing the adhesion and compatibility of polylysine-modified mesoporous silica with other materials, thereby improving the sealing of the material. Moreover, the pore structure of mesoporous silica can absorb trace amounts of moisture, reduce the early hydration rate of calcium sulfate hemihydrate, and gradually increase the degree of hydration in the later stage. Modified mesoporous silica can maintain the micro-expansion characteristics of the slurry after solidification by controlling the solidification speed of the slurry and delaying the heat release rate, thereby increasing the bonding strength between the solidified slurry and the frame around the through-hole and enhancing the sealing performance.

[0024] Silicon-containing reinforcing fillers can improve the fluidity of the slurry and help fill the tiny gaps in the through-holes.

[0025] In the present invention, first by liquid nitrogen to diatomite surface pretreatment, by liquid nitrogen treatment, the surface property of diatomite can change, thus more easily combined with other substances. Stearic acid, as a surfactant, can improve the dispersibility and compatibility of diatomite in sealing material, then by polyglutamic acid and alum treatment, the cohesiveness of alum can make diatomite particles more closely combined, form stronger bonding force, thus improve the bonding performance of sealing material, alum modified diatomite can better fill the tiny gap in sealing material, form a dense impermeable layer, prevent the penetration of materials such as moisture and gas. Polyglutamic acid has very strong water absorption simultaneously, can regulate the humidity inside diatomite within a certain range, when in a humid environment, polyglutamic acid can absorb excess moisture, prevent light sizing material from losing efficacy due to excessive moisture, when light sizing material is in a dry environment, polyglutamic acid can release moisture again, keeps the wettability of light sizing material.

[0026] Both ends of the through-hole are sealed with lightweight rubber compound, which uses a synthetic resin composition as a matrix material, wherein the synthetic resin composition is a mixture of butyl rubber and methyl vinyl silicone rubber, wherein both butyl rubber and methyl vinyl silicone rubber have excellent adhesion and water resistance, and good sealing performance. Therefore, when both ends of the through-hole are sealed with lightweight rubber compound, it plays a decisive role in improving the airtightness and watertightness of the entire penetration device, and can completely eliminate the adverse effect of the high porosity of the lightweight micro-expanding refractory slurry in the middle of the through-hole gap on the airtightness of the penetration piece.

[0027] Beneficial effects of the present invention:

[0028] (1) The plugging form makes the construction simpler. The lightweight rubber material has viscoelasticity and can be easily pulled and kneaded in any shape. Any shape of the through-hole can be easily filled. The light micro-expanding refractory slurry has a curing time of 50 to 90 minutes, and the curing time is stable and is not affected by the ambient temperature. It has wide adaptability. The sealing form of the present invention can be used for through-holes of offshore facilities such as ships, offshore oil platforms, and offshore booster stations, and can meet A0 and A60 fire resistance standards.

[0029] (2) The lightweight micro-expanding refractory slurry is light after solidification, with a specific gravity of ≤1.40×10 3 kg / m 3 , has good thermal insulation performance, thermal conductivity < 0.6 W / (m·K). In addition, the anions of the slurry components are mainly sulfate and silicate, and even in a humid environment, there is basically no electrochemical corrosion to metals such as steel and aluminum. Under strong direct current accelerated electrolysis, the number of anodic oxidation corrosion points of the metal is less than 0.25%. Therefore, the sealing material prepared by the present invention has excellent electrochemical corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0031] Figure 1 The electron microscope image of the steel plate without electrochemical corrosion when the sealing material prepared in Example 1 is applied to the steel plate material (left), the electron microscope image of the steel plate anode after electrochemical corrosion accelerated by strong direct current (middle), and as a comparison, the electron microscope image of the steel plate anode after electrochemical corrosion accelerated by strong direct current in the halide filler (right);

[0032] Figure 2 The electron microscope image of the aluminum plate without electrochemical corrosion when the sealing material prepared in Example 1 is applied to the steel plate material (left), the electron microscope image of the aluminum plate anode after strong direct current accelerated electrochemical corrosion (middle), and as a comparison, the electron microscope image of the aluminum plate anode after traditional strong direct current accelerated electrochemical corrosion in a halide filler (right). DETAILED DESCRIPTION

[0033] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0034] In the comparative examples and embodiments of the present invention:

[0035] Calcium sulfate hemihydrate nanopowder: purchased from Hubei Shixing Chemical Co., Ltd., product number: 10034-76-1;

[0036] Calcium sulfate whiskers: Sichuan Jingying New Materials Technology Co., Ltd.

[0037] Mesoporous silica: Beijing Zhongke Keyou Technology Co., Ltd.

[0038] Sodium carboxymethyl cellulose: purchased from Zhengzhou Jiuting Chemical Products Co., Ltd.

[0039] Butyl rubber: purchased from Hubei Yongkuo Technology Co., Ltd., product number: YK3039;

[0040] Methyl vinyl silicone rubber: purchased from Hesheng Silicon Industry Co., Ltd., model: 110-2;

[0041] Kaolin: purchased from Changzhou Antai Chemical Co., Ltd.

[0042] Diatomaceous earth: purchased from Shandong Zhengxing New Materials Co., Ltd., product number: CG8;

[0043] Bentonite: purchased from Hubei Kewode Chemical Co., Ltd.;

[0044] Polyethylene glycol: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., product number: P103737;

[0045] Sodium carboxymethyl cellulose: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., product number: C104986;

[0046] Hydroxypropyl methylcellulose: purchased from Chongqing Ruiya Biotechnology Co., Ltd.;

[0047] Poly-L-lysine: purchased from Shandong Yatu Biotechnology Co., Ltd.;

[0048] Stearic acid: purchased from Shanghai Fangye Chemical Co., Ltd.

[0049] Polyglutamic acid: purchased from Hefei Hechen Biotechnology Co., Ltd., catalog number: HC007;

[0050] Alum: purchased from Hubei Kewode Chemical Co., Ltd.;

[0051] Chlorinated paraffin: purchased from Jinan Shanhai Chemical Technology Co., Ltd., product number: LHSL01;

[0052] Chloroether resin: purchased from Tianmen Hengchang Chemical Co., Ltd., product number: HC3556;

[0053] Glycerol monooleate: purchased from Shandong Huling New Materials Co., Ltd.

[0054] Example 1

[0055] The light micro-expanded refractory slurry includes the following raw materials in parts by weight: 40 parts of hemihydrate calcium sulfate nanopowder, 10 parts of calcium sulfate whiskers, 5 parts of modified mesoporous silica, 10 parts of fly ash, 0.1 parts of melamine water reducer, 0.01 parts of protein retarder, 0.1 parts of polyethylene glycol, and 0.1 parts of sodium carboxymethyl cellulose;

[0056] The lightweight rubber material comprises the following raw materials in parts by weight: 10 parts of a mixture of butyl rubber and methyl vinyl silicone rubber in a mass ratio of 1:1, 20 parts of chlorinated paraffin, 20 parts of kaolin, 10 parts of modified diatomaceous earth and 20 parts of bentonite;

[0057] The preparation process of the modified mesoporous silica is as follows:

[0058] In parts by weight, 5 parts of mesoporous silica were put into 40 parts of 15% polylysine solution, stirred for 45 minutes, and after removing the solvent, vacuum dried at 95°C for 8 hours. The dried solid was ball milled at a speed of 400 r / min for 35 minutes to obtain modified mesoporous silica.

[0059] The preparation process of the modified diatomite is as follows:

[0060] In parts by weight, 5 parts of diatomaceous earth were placed in liquid nitrogen for 25 minutes, taken out and ball-milled at a speed of 400 r / min for 35 minutes in a ball mill, and then 20 parts of stearic acid were added thereto, and the ball milling was continued for 30 minutes to obtain solid A. 5 parts of polyglutamic acid, 4 parts of alum and 10 parts of deionized water were added to the solid at room temperature, mixed evenly, and dried at 85° C. for 15 hours to obtain modified diatomaceous earth.

[0061] Seal both ends of the through hole with lightweight adhesive, dilute the lightweight micro-expanding refractory slurry with water, mix evenly to obtain a viscous slurry with excellent flow properties, wherein the weight of water is 45% of the weight of the lightweight micro-expanding refractory slurry, pour the viscous slurry into the middle of the through hole, and solidify it for 50 minutes.

[0062] according to Figure 1 , Figure 2 It can be seen that the sealing material prepared in this embodiment has less than 0.25% of metal anodic oxidation corrosion points under strong direct current accelerated electrolysis, and has excellent electrochemical corrosion resistance.

[0063] Example 2

[0064] The lightweight micro-expanded refractory slurry comprises the following raw materials in parts by weight: 47 parts of hemihydrate calcium sulfate nanopowder, 15 parts of calcium sulfate whiskers, 10 parts of modified mesoporous silica, 18 parts of fly ash, 1 part of polycarboxylic acid water reducer, 0.3 parts of organic acid retarder, 0.3 parts of glycerol monooleate and 0.3 parts of hydroxypropyl methylcellulose;

[0065] The lightweight rubber compound comprises the following raw materials in parts by weight: 20 parts of a mixture of butyl rubber and methyl vinyl silicone rubber in a mass ratio of 1.5:2, 25 parts of chloroether resin, 25 parts of kaolin, 15 parts of modified diatomaceous earth and 15 parts of bentonite;

[0066] The preparation process of the modified mesoporous silica is as follows:

[0067] In parts by weight, 10 parts of mesoporous silica were put into 50 parts of 20% polylysine solution, stirred for 50 minutes, and after removing the solvent, vacuum dried at 100°C for 12 hours. The dried solid was ball milled at a speed of 400 r / min for 35 minutes to obtain modified mesoporous silica.

[0068] The preparation process of the modified diatomite is as follows:

[0069] In parts by weight, 8 parts of diatomaceous earth were placed in liquid nitrogen for 30 minutes, taken out and ball-milled at a speed of 400 r / min for 35 minutes in a ball mill, and then 25 parts of stearic acid were added thereto, and the ball milling was continued for 35 minutes to obtain solid A. 6 parts of polyglutamic acid, 5 parts of alum and 15 parts of deionized water were added to solid A at room temperature, and after mixing evenly, the modified diatomaceous earth was dried at 85° C. for 15 hours.

[0070] Seal both ends of the through-hole with lightweight adhesive, dilute the lightweight micro-expanding refractory slurry with water, mix evenly to obtain a viscous slurry with excellent flow properties, wherein the weight of water is 50% of the weight of the lightweight micro-expanding refractory slurry, pour the viscous slurry into the middle of the through-hole, and solidify it in 78 minutes.

[0071] Example 3

[0072] The lightweight micro-expanded refractory slurry comprises the following raw materials in parts by weight: 55 parts of calcium sulfate hemihydrate nanopowder, 20 parts of calcium sulfate whiskers, 15 parts of modified mesoporous silica, 25 parts of fly ash, 2 parts of polycarboxylic acid water reducer, 0.5 parts of organic acid retarder, 0.3 parts of glycerol monooleate and 0.5 parts of hydroxypropyl methylcellulose;

[0073] The lightweight rubber material comprises the following raw materials in parts by weight: 18 parts of a mixture of butyl rubber and methyl vinyl silicone rubber in a mass ratio of 2:3, 35 parts of chlorinated paraffin, 30 parts of kaolin, 20 parts of modified diatomaceous earth and 20 parts of bentonite;

[0074] The preparation process of the modified mesoporous silica is as follows:

[0075] In parts by weight, 15 parts of mesoporous silica were put into 60 parts of 25% polylysine solution, stirred for 60 minutes, and after removing the solvent, vacuum dried at 105°C for 14 hours. The dried solid was ball milled at a speed of 400 r / min for 35 minutes to obtain modified mesoporous silica.

[0076] The preparation process of the modified diatomite is as follows:

[0077] In parts by weight, 10 parts of diatomaceous earth were placed in liquid nitrogen for 35 minutes, taken out and ball-milled at a speed of 400 r / min for 35 minutes in a ball mill, and then 30 parts of stearic acid were added thereto, and the ball milling was continued for 40 minutes to obtain solid A. 8 parts of polyglutamic acid, 6 parts of alum and 20 parts of deionized water were added to solid A at room temperature, mixed evenly, and dried at 85° C. for 15 hours to obtain modified diatomaceous earth.

[0078] Seal both ends of the through-hole with lightweight adhesive, dilute the lightweight micro-expanding refractory slurry with water, mix evenly to obtain a viscous slurry with excellent flow properties, wherein the weight of water is 55% of the weight of the lightweight micro-expanding refractory slurry, pour the viscous slurry into the middle of the through-hole, and solidify it in 90 minutes.

[0079] Comparative Example 1

[0080] The difference between Comparative Example 1 and Example 1 is that the mesoporous silica in Comparative Example 1 is not modified, and the other operations are the same.

[0081] Comparative Example 2

[0082] The difference between Comparative Example 2 and Example 1 is that the diatomaceous earth in Comparative Example 2 is not modified, and the other operations are the same.

[0083] Comparative Example 3

[0084] The difference between Comparative Example 3 and Example 1 is that no modified mesoporous silica is added in Comparative Example 3, and the other operations are the same.

[0085] Comparative Example 4

[0086] The difference between Comparative Example 4 and Example 1 is that no modified diatomaceous earth is added in Comparative Example 4, and the other operations are the same.

[0087] Performance Test:

[0088] Fire resistance standard: Fire resistance test was carried out in accordance with the requirements of Part 3 of Annex 1 of the 2010 International Fire Test Procedure Application Rules (2010FTP Rules) of the International Maritime Organization. The results are shown in Table 1:

[0089] Table 1

[0090]

[0091] Sealing test: The sizes of the sealing test components used are 1006L*306W*140D, 156L*106W*140D, ф300*140D, ф32*140D. The water tightness is tested at 0.35MPa for 60 minutes, and the air tightness is tested at 0.25MPa for 30 minutes. The results are shown in Table 2:

[0092] Table 2

[0093]

[0094] Compressive strength: refer to GB / T 17671-2021 "Test method for strength of cement mortar (ISO method)", and the results are as shown in Table 3:

[0095] Table 3

[0096]

[0097] According to the above data, the lightweight micro-expanding refractory slurry and lightweight rubber prepared in the present invention have excellent fire resistance.

[0098] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sealing material for a through hole, characterized in that: The sealing material is a lightweight micro-expanded refractory slurry applied to the middle of the through hole and a lightweight rubber compound applied to both ends of the through hole, wherein the lightweight micro-expanded refractory slurry comprises the following raw materials in parts by weight: 40-55 parts of hemihydrate calcium sulfate nanopowder, 10-20 parts of calcium sulfate whiskers, 5-15 parts of modified mesoporous silica, 10-25 parts of silicon-containing reinforcing fillers, 0.1-2 parts of water reducers, 0.01-0.5 parts of retarders, 0.1-0.5 parts of defoamers and 0.1-0.5 parts of stabilizers; wherein the lightweight rubber compound comprises the following raw materials in parts by weight: 10-20 parts of synthetic resin compositions, 20-40 parts of flame retardants, 20-30 parts of kaolin, 10-20 parts of modified diatomaceous earth and 10-20 parts of bentonite; The preparation process of the modified mesoporous silica is as follows: In parts by weight, 5 to 15 parts of mesoporous silica are placed in 40 to 60 parts of a polylysine solution having a mass fraction of 15 to 25%, stirred for 45 to 60 minutes, and after removing the solvent, vacuum dried at 95 to 105° C. for 8 to 14 hours. The dried solid is ball milled at a speed of 400 r / min for 35 minutes to obtain modified mesoporous silica; The kaolin described herein is kaolin whose surface is treated with a silane coupling agent, and the specific treatment process is as follows: The kaolin is placed in a silane coupling agent KH550 solution with a mass fraction of 10-15%, stirred for 5 hours, filtered and completely dried to obtain the kaolin with the surface treated with the silane coupling agent, wherein the solid-liquid ratio of the kaolin to the silane coupling agent solution is 1:20 g / mL; The preparation process of the modified diatomite is as follows: In parts by weight, 5 to 10 parts of diatomaceous earth are placed in liquid nitrogen for 25 to 35 minutes, taken out and ball-milled at a speed of 400 r / min for 35 minutes in a ball mill, and then 20 to 30 parts of stearic acid are added thereto, and the ball milling is continued for 30 to 40 minutes to obtain solid A, and 5 to 8 parts of polyglutamic acid, 4 to 6 parts of alum and 10 to 20 parts of deionized water are added to solid A at room temperature, mixed evenly, and dried at 85° C. for 15 hours to obtain modified diatomaceous earth; The synthetic resin composition is butyl rubber and methyl vinyl silicone rubber in a mass ratio of (1-2):(1-3).

2. The sealing material for a through hole according to claim 1, characterized in that: The particle size of the hemihydrate calcium sulfate nanopowder is 50-200 nm, the average diameter of the calcium sulfate whisker is 1-10 μm, the average length is 50-250 μm, the aspect ratio is >35, and the silicon-containing reinforcing filler is one or more of fly ash, kaolin, white carbon black, diatomaceous earth and quartz sand.

3. The sealing material for a through hole according to claim 1, characterized in that: The water reducer is one or both of a melamine water reducer and a polycarboxylic acid water reducer.

4. The sealing material for a through hole according to claim 1, characterized in that: The retarder is one or more of a protein retarder, an organic acid and a soluble salt thereof.

5. The sealing material for a through hole according to claim 1, characterized in that: The stabilizer is one or more of sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose and polyvinyl alcohol.

6. The sealing material for a through hole according to claim 1, characterized in that: The defoaming agent is one or more of mineral oil, polyethylene glycol, and glycerol monooleate.

7. The sealing material for a through hole according to claim 1, characterized in that: The flame retardant is one or two of chlorinated paraffin and chloroether resin.

8. The sealing material for a through hole according to claim 1, characterized in that: The average particle size of the kaolin is 800-1500 mesh, the particle size of the diatomaceous earth is 400-800 mesh, and the particle size of the bentonite is 325-400 mesh.

9. An application of the sealing material for a through-hole according to any one of claims 1 to 8, characterized in that: During the application, both ends of the through hole are sealed with lightweight adhesive, lightweight micro-expanding refractory slurry is diluted with water, and mixed evenly to obtain a viscous slurry with excellent flowability, wherein the weight of water is 45-55% of the weight of the lightweight micro-expanding refractory slurry, and the viscous slurry is poured into the middle of the through hole and solidified for 50-90 minutes.

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