Fireproof mud for cable tunnel as well as preparation method and application of fireproof mud

Abstract

The invention discloses fireproof mud for a cable tunnel as well as a preparation method and application of the fireproof mud. The fireproof mud is prepared from the following raw materials in parts by weight: 30 to 60 parts of kaolin, 1 to 20 parts of silicon dioxide, 10 to 30 parts of mica, 1 to 20 parts of aluminum hydroxide, 1 to 20 parts of magnesium hydroxide, 1 to 100 parts of macromolecular emulsion, 10 to 30 parts of inorganic fiber, 1 to 10 parts of chlorinated paraffin and 10 to 30 parts of water glass. The fireproof mud prepared by the invention can be used for cable penetration and other parts of a tunnel of a transformer substation, not only has the characteristics of good plasticity, sealing, weather resistance, water resistance, oil resistance, acid and alkali resistance and the like, but also can form a complete and firm porcelain body under the condition of continuous high temperature or flame ablation, shows excellent fireproof and plugging performance, and can be used as a fireproof material for the tunnel of the transformer substation. The cable tunnel fireproof plugging device can be applied to the technical field of fireproof plugging of the cable tunnels of the transformer substations, and fire disasters and smoke spreading of the cable tunnels of the transformer substations are effectively prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of fire prevention, and in particular relates to fireproof mud for cable tunnels and a preparation method and application thereof. Background Art

[0002] The pipelines in the substation cable tunnel are complex. Once a fire occurs, the holes and gaps formed by the pipelines passing through the wall or floor are the ways for the fire to spread. Therefore, in order to reduce fire losses and protect people’s lives and property, fireproofing and blocking weak points such as through holes in the tunnel is very important.

[0003] As a flexible plugging material, fireproof mud has good plasticity and can be used to plug the through holes and gaps of pipelines. However, the existing fireproof mud has limited properties such as water resistance, oil resistance, acid and alkali resistance, weather resistance and fire resistance. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing fireproof mud has relatively limited properties such as water resistance, oil resistance, acid and alkali resistance, weather resistance and fire resistance.

[0005] In a first aspect, the present invention provides a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight:

[0006] 30-60 parts of kaolin, 1-20 parts of silicon dioxide, 10-30 parts of mica, 1-20 parts of aluminum hydroxide, 1-20 parts of magnesium hydroxide, 1-100 parts of polymer emulsion, 10-30 parts of inorganic fiber, 1-10 parts of chlorinated paraffin and 10-30 parts of water glass.

[0007] As a preferred design, the fireproof mud for cable tunnels includes the following raw materials in parts by weight:

[0008] 50-60 parts of kaolin, 10-20 parts of silicon dioxide, 10-20 parts of mica, 10-15 parts of aluminum hydroxide, 10-15 parts of magnesium hydroxide, 80-100 parts of polymer emulsion, 10-20 parts of inorganic fiber, 5-10 parts of chlorinated paraffin and 5-10 parts of water glass.

[0009] As a preferred design, the fireproof mud for cable tunnels includes the following raw materials in parts by weight:

[0010] 50 parts of kaolin, 10 parts of silicon dioxide, 20 parts of mica, 10 parts of aluminum hydroxide, 10 parts of magnesium hydroxide, 80 parts of polymer emulsion, 20 parts of inorganic fiber, 5 parts of chlorinated paraffin and 10 parts of water glass.

[0011] As a possible design, the polymer emulsion is acrylic-organic silicon emulsion, acrylic-polyurethane emulsion or silicone-polyurethane emulsion.

[0012] As a possible design, the inorganic fiber is at least one of glass fiber, basalt fiber and ceramic fiber.

[0013] As a possible design, the chlorine content in the chlorinated paraffin is 30wt%, 40wt%, 50wt% or 70v%.

[0014] In another aspect, the present invention provides a method for preparing fireproof mud for cable tunnels, comprising the following steps:

[0015] Grinding kaolin and silicon dioxide under vacuum to obtain a mixture 1 having an average particle size of 1 to 10 μm;

[0016] Grinding mica, aluminum hydroxide and magnesium hydroxide under vacuum to obtain a mixture 2 with an average particle size of 1 to 5 μm;

[0017] Mixture 1, mixture 2, polymer emulsion, inorganic fiber, chlorinated paraffin and water glass are kneaded for 20 to 50 minutes in a vacuum and closed condition at a kneading temperature of 60 to 100° C., then cooled to 25 to 35° C. and kneaded for 10 to 20 minutes.

[0018] As a possible design, the banburying temperature is 90-100°C.

[0019] As a possible design, mixing is carried out in an internal mixer at a rotation speed of 50 to 150 r / min.

[0020] Beneficial effects of the present invention:

[0021] The fireproof mud disclosed in the present invention is mainly obtained by mixing kaolin, silicon dioxide, mica, aluminum hydroxide, magnesium hydroxide, polymer emulsion, inorganic fiber, chlorinated paraffin and water glass, and the preparation method is simple to operate, low in cost, environmentally friendly, and easy to mass produce. The fireproof mud prepared by the present invention can be used for substation tunnel cable penetration and other parts, and not only has good plasticity, sealing, weather resistance, water resistance, oil resistance, acid and alkali resistance and other characteristics, but also can form a complete and solid porcelain body under continuous high temperature or flame ablation conditions, showing excellent fire prevention and blocking performance, effectively preventing the spread of fire and smoke in the substation cable tunnel, ensuring the fire safety of power facilities, and can be applied to the field of fireproof blocking technology for substation cable tunnels. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in combination with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] Since the existing fireproof mud used in substation cable tunnels has relatively limited water resistance, oil resistance, acid and alkali resistance, weather resistance and fire resistance, it is very necessary to develop fireproof mud suitable for sealing in substation cable tunnels.

[0024] In response to the above problems, the inventors found that the fireproof mud obtained by mixing kaolin, silica, mica, aluminum hydroxide, magnesium hydroxide, polymer emulsion, inorganic fiber, chlorinated paraffin and water glass has good comprehensive properties, including water resistance, fire resistance, oil resistance, acid and alkali resistance and weather resistance, and is particularly suitable for use as a plugging agent in substation cable tunnels.

[0025] The present invention discloses a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight:

[0026] 30-60 parts of kaolin, 1-20 parts of silicon dioxide, 10-30 parts of mica, 1-20 parts of aluminum hydroxide, 1-20 parts of magnesium hydroxide, 1-100 parts of polymer emulsion, 10-30 parts of inorganic fiber, 1-10 parts of chlorinated paraffin and 10-30 parts of water glass.

[0027] Among them, the mass part of kaolin may preferably be 50 to 60 parts, and more preferably 50 parts. The mass part of silicon dioxide may preferably be 10 to 20 parts, and more preferably 10 parts. The mass part of mica may preferably be 10 to 20 parts, and more preferably 20 parts. The mass part of aluminum hydroxide may preferably be 10 to 15 parts, and more preferably 10 parts. The mass part of magnesium hydroxide may preferably be 10 to 15 parts, and more preferably 10 parts. The mass part of polymer emulsion may preferably be 80 to 100 parts, and more preferably 80 parts. The mass part of inorganic fiber may preferably be 10 to 20 parts, and more preferably 20 parts. The mass part of chlorinated paraffin may preferably be 5 to 10 parts, and more preferably 5 parts. The mass part of water glass may preferably be 5 to 10 parts, and more preferably 10 parts.

[0028] The polymer emulsion includes but is not limited to acrylic acid-organic silicon emulsion, acrylic acid-polyurethane emulsion or silicone-polyurethane emulsion. The inorganic fiber includes but is not limited to at least one of glass fiber, basalt fiber and ceramic fiber. The chlorine content of the chlorinated paraffin is 30wt%, 40wt%, 50wt% or 70wt%.

[0029] The present invention also discloses a method for preparing the fireproof mud for cable tunnels, comprising the following steps:

[0030] S1. The kaolin and silica are ground under vacuum to obtain a mixture 1 having an average particle size of 1 to 10 μm;

[0031] S2. The mica, aluminum hydroxide and magnesium hydroxide were ground under vacuum to obtain a mixture 2 having an average particle size of 1 to 5 μm;

[0032] S3. Mixture 1, mixture 2, polymer emulsion, inorganic fiber, chlorinated paraffin and water glass are mixed under vacuum and closed conditions for 20 to 50 minutes at a mixing temperature of 60 to 100° C., then cooled to 25 to 35° C. and mixed for another 10 to 20 minutes.

[0033] The kaolin, silicon dioxide, mica, aluminum hydroxide and magnesium hydroxide are ground mainly to facilitate better coating of the polymer emulsion on their surfaces.

[0034] The mixing process is mainly carried out in an internal mixer, which is a common device in the art and will not be described in detail here.

[0035] The speed during mixing is generally 50 to 150 r / min, preferably about 120 r / min. The mixing temperature may preferably be 90 to 100°C.

[0036] Example 1

[0037] The present embodiment discloses a fireproof mud for cable tunnels, comprising the following raw materials in parts by weight: 50 parts of kaolin, 10 parts of silicon dioxide, 20 parts of mica, 10 parts of aluminum hydroxide, 10 parts of magnesium hydroxide, 80 parts of silicone-polyurethane emulsion, 20 parts of ceramic fiber, 5 parts of chlorinated paraffin (chlorine content is 30wt%) and 10 parts of water glass.

[0038] The method for preparing fireproof mud for cable tunnel is as follows:

[0039] Place 50 parts of kaolin and 10 parts of silicon dioxide in a grinder, grind for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 3 μm, which is set aside; place 20 parts of mica, 10 parts of aluminum hydroxide and 10 parts of magnesium hydroxide in a grinder, grind for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 2 μm, which is set aside; mix the above mixture 1, mixture 2, 80 parts of silicone-polyurethane emulsion, 20 parts of ceramic fiber, 5 parts of chlorinated paraffin (chlorine content is 30wt%) and 10 parts of water glass in an internal mixer, keep a vacuum state at a speed of 100 r / min and a temperature of 90°C, mix for 40 minutes, drop the temperature to 30°C, and continue mixing for 15 minutes to obtain fireproof mud.

[0040] Example 2

[0041] The present embodiment discloses a fireproof mud for cable tunnels, comprising the following raw materials in parts by weight: 50 parts of kaolin, 10 parts of silicon dioxide, 20 parts of mica, 10 parts of aluminum hydroxide, 10 parts of magnesium hydroxide, 100 parts of acrylic-silicone emulsion, 20 parts of glass fiber, 10 parts of chlorinated paraffin (chlorine content is 40wt%) and 10 parts of water glass.

[0042] The method for preparing fireproof mud for cable tunnel is as follows:

[0043] Place 50 parts of kaolin and 10 parts of silicon dioxide in a grinder, grind for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 1 μm, which is set aside; place 20 parts of mica, 10 parts of aluminum hydroxide and 10 parts of magnesium hydroxide in a grinder, grind for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 1 μm, which is set aside; mix the above mixture 1, mixture 2, 100 parts of acrylic-silicone emulsion, 20 parts of glass fiber, 10 parts of chlorinated paraffin (chlorine content is 40wt%), and 10 parts of water glass in an internal mixer, keep a vacuum state at a speed of 100r / min and a temperature of 90°C, mix for 40 minutes, reduce the temperature to 30°C, and continue mixing for 15 minutes to obtain fireproof mud.

[0044] Example 3

[0045] The embodiment discloses a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight: 50 parts of kaolin, 20 parts of silicon dioxide, 10 parts of mica, 15 parts of aluminum hydroxide, 15 parts of magnesium hydroxide, 100 parts of acrylic-organic silicon emulsion, 20 parts of glass fiber, 10 parts of chlorinated paraffin (chlorine content is 50wt%) and 15 parts of water glass.

[0046] The method for preparing fireproof mud for cable tunnel is as follows:

[0047] Place 50 parts of kaolin and 20 parts of silicon dioxide in a grinder, grind for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 3 μm, which is set aside; place 10 parts of mica, 15 parts of aluminum hydroxide and 15 parts of magnesium hydroxide in a grinder, grind for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 2 μm, which is set aside; mix the above mixture 1, mixture 2, 100 parts of acrylic-silicone emulsion, 20 parts of glass fiber, 10 parts of chlorinated paraffin (chlorine content is 50wt%), and 15 parts of water glass in an internal mixer, keep a vacuum state at a speed of 120r / min and a temperature of 90°C, mix for 50 minutes, reduce the temperature to 30°C, and continue mixing for 10 minutes to obtain fireproof mud.

[0048] Example 4

[0049] The embodiment discloses a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight: 50 parts of kaolin, 20 parts of silicon dioxide, 10 parts of mica, 15 parts of aluminum hydroxide, 15 parts of magnesium hydroxide, 100 parts of acrylic-polyurethane emulsion, 10 parts of glass fiber, 10 parts of basalt fiber, 10 parts of chlorinated paraffin (chlorine content is 40wt%) and 15 parts of water glass.

[0050] The method for preparing fireproof mud for cable tunnel is as follows:

[0051] Place 50 parts of kaolin and 20 parts of silicon dioxide in a grinder, grind for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 3 μm, which is set aside; place 10 parts of mica, 15 parts of aluminum hydroxide and 15 parts of magnesium hydroxide in a grinder, grind for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 2 μm, which is set aside; mix the above mixture 1, mixture 2, 100 parts of acrylic-polyurethane emulsion, 10 parts of glass fiber, 10 parts of basalt fiber, 10 parts of chlorinated paraffin (chlorine content is 40wt%), and 15 parts of water glass in an internal mixer, keep a vacuum state at a speed of 120r / min and a temperature of 100°C, mix for 50 minutes, reduce the temperature to 30°C, and continue mixing for 10 minutes to obtain fireproof mud.

[0052] Example 5

[0053] The embodiment discloses a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight: 50 parts of kaolin, 20 parts of silicon dioxide, 10 parts of mica, 15 parts of aluminum hydroxide, 15 parts of magnesium hydroxide, 50 parts of acrylic-polyurethane emulsion, 20 parts of silicone-polyurethane emulsion, 10 parts of glass fiber, 5 parts of basalt fiber, 5 parts of ceramic fiber, 3 parts of chlorinated paraffin (chlorine content of 40wt%), 5 parts of chlorinated paraffin (chlorine content of 70wt%) and 15 parts of water glass.

[0054] The method for preparing fireproof mud for cable tunnel is as follows:

[0055] 50 parts of kaolin and 20 parts of silicon dioxide are placed in a grinder, and ground for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 3 μm, which is set aside; 10 parts of mica, 15 parts of aluminum hydroxide, and 15 parts of magnesium hydroxide are placed in a grinder, and ground for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 2 μm, which is set aside; the above mixture 1, mixture 2, 50 parts of acrylic-polyurethane emulsion, 20 parts of silicone-polyurethane emulsion, 10 parts of glass fiber, 5 parts of basalt fiber, 5 parts of ceramic fiber, 3 parts of chlorinated paraffin (chlorine content is 40wt%), 5 parts of chlorinated paraffin (chlorine content is 70wt%), and 15 parts of water glass are mixed in an internal mixer, at a speed of 120r / min and a temperature of 100°C, a vacuum state is maintained, and mixing is carried out for 50 minutes, the temperature is reduced to 30°C, and mixing is continued for 10 minutes to obtain fireproof mud.

[0056] Example 6

[0057] The embodiment discloses a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight: 30 parts of kaolin, 5 parts of silicon dioxide, 25 parts of mica, 5 parts of aluminum hydroxide, 20 parts of magnesium hydroxide, 10 parts of acrylic-polyurethane emulsion, 30 parts of silicone-polyurethane emulsion, 3 parts of glass fiber, 5 parts of basalt fiber, 3 parts of ceramic fiber, 1 part of chlorinated paraffin (with a chlorine content of 40wt%), 1 part of chlorinated paraffin (with a chlorine content of 70wt%) and 30 parts of water glass.

[0058] The method for preparing fireproof mud for cable tunnel is as follows:

[0059] 30 parts of kaolin and 5 parts of silicon dioxide are placed in a grinder, and ground for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 3 μm, which is set aside; 25 parts of mica, 5 parts of aluminum hydroxide, and 20 parts of magnesium hydroxide are placed in a grinder, and ground for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 2 μm, which is set aside; the above mixture 1, mixture 2, 10 parts of acrylic-polyurethane emulsion, 30 parts of silicone-polyurethane emulsion, 3 parts of glass fiber, 5 parts of basalt fiber, 3 parts of ceramic fiber, 1 part of chlorinated paraffin (chlorine content is 40wt%), 1 part of chlorinated paraffin (chlorine content is 70wt%), and 30 parts of water glass are mixed in an internal mixer, at a speed of 120r / min and a temperature of 100°C, a vacuum state is maintained, and mixing is carried out for 50 minutes, the temperature is reduced to 30°C, and mixing is continued for 10 minutes to obtain fireproof mud.

[0060] Example 7

[0061] The embodiment discloses a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight: 30 parts of kaolin, 1 part of silicon dioxide, 15 parts of mica, 2 parts of aluminum hydroxide, 3 parts of magnesium hydroxide, 40 parts of acrylic-polyurethane emulsion, 20 parts of silicone-polyurethane emulsion, 5 parts of glass fiber, 5 parts of basalt fiber, 2 parts of ceramic fiber, 5 parts of chlorinated paraffin (chlorine content of 40wt%), 2 parts of chlorinated paraffin (chlorine content of 70wt%) and 25 parts of water glass.

[0062] The method for preparing fireproof mud for cable tunnel is as follows:

[0063] 30 parts of kaolin and 15 parts of silicon dioxide are placed in a grinder, and ground for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 3 μm, which is set aside; 15 parts of mica, 2 parts of aluminum hydroxide, and 3 parts of magnesium hydroxide are placed in a grinder, and ground for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 2 μm, which is set aside; the above mixture 1, mixture 2, 40 parts of acrylic-polyurethane emulsion, 20 parts of silicone-polyurethane emulsion, 5 parts of glass fiber, 5 parts of basalt fiber, 2 parts of ceramic fiber, 5 parts of chlorinated paraffin (chlorine content is 40wt%), 2 parts of chlorinated paraffin (chlorine content is 70wt%), and 25 parts of water glass are mixed in an internal mixer, at a speed of 120r / min and a temperature of 100°C, a vacuum state is maintained, and mixing is carried out for 50 minutes, the temperature is reduced to 30°C, and mixing is continued for 10 minutes to obtain fireproof mud.

[0064] Example 8

[0065] The embodiment discloses a fireproof mud for a cable tunnel, comprising the following raw materials in parts by weight: 60 parts of kaolin, 8 parts of silicon dioxide, 10 parts of mica, 15 parts of aluminum hydroxide, 14 parts of magnesium hydroxide, 50 parts of acrylic-polyurethane emulsion, 30 parts of silicone-polyurethane emulsion, 5 parts of glass fiber, 6 parts of ceramic fiber, 2 parts of chlorinated paraffin (containing 40wt% of chlorine), 2 parts of chlorinated paraffin (containing 70wt% of chlorine) and 15 parts of water glass.

[0066] The method for preparing fireproof mud for cable tunnel is as follows:

[0067] 60 parts of kaolin and 8 parts of silicon dioxide are placed in a grinder, and ground for 10 minutes at room temperature and vacuum conditions to obtain a mixture 1 with a particle size of 3 μm, which is set aside; 10 parts of mica, 15 parts of aluminum hydroxide, and 14 parts of magnesium hydroxide are placed in a grinder, and ground for 15 minutes at room temperature and vacuum conditions to obtain a mixture 2 with a particle size of 2 μm, which is set aside; the above mixture 1, mixture 2, 50 parts of acrylic-polyurethane emulsion, 30 parts of silicone-polyurethane emulsion, 5 parts of glass fiber, 6 parts of ceramic fiber, 2 parts of chlorinated paraffin (chlorine content is 40wt%), 2 parts of chlorinated paraffin (chlorine content is 70wt%), and 15 parts of water glass are mixed in an internal mixer, at a speed of 120r / min and a temperature of 100°C, the vacuum state is maintained, and the mixing is carried out for 50 minutes, the temperature is reduced to 30°C, and the mixing is continued for 10 minutes to obtain fireproof mud.

[0068] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fireproof mud for cable tunnels, characterized in that: The invention comprises the following raw materials in parts by weight: 30-60 parts of kaolin, 1-20 parts of silicon dioxide, 10-30 parts of mica, 1-20 parts of aluminum hydroxide, 1-20 parts of magnesium hydroxide, 1-100 parts of polymer emulsion, 10-30 parts of inorganic fiber, 1-10 parts of chlorinated paraffin and 10-30 parts of water glass.

2. The fireproof mud for cable tunnel according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 50-60 parts of kaolin, 10-20 parts of silicon dioxide, 10-20 parts of mica, 10-15 parts of aluminum hydroxide, 10-15 parts of magnesium hydroxide, 80-100 parts of polymer emulsion, 10-20 parts of inorganic fiber, 5-10 parts of chlorinated paraffin and 5-10 parts of water glass.

3. The fireproof mud for cable tunnel according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 50 parts of kaolin, 10 parts of silicon dioxide, 20 parts of mica, 10 parts of aluminum hydroxide, 10 parts of magnesium hydroxide, 80 parts of polymer emulsion, 20 parts of inorganic fiber, 5 parts of chlorinated paraffin and 10 parts of water glass.

4. The fireproof mud for cable tunnel according to any one of claims 1 to 3, characterized in that: The polymer emulsion is acrylic acid-organic silicon emulsion, acrylic acid-polyurethane emulsion or organic silicon-polyurethane emulsion.

5. The fireproof mud for cable tunnel according to any one of claims 1 to 3, characterized in that: The inorganic fiber is at least one of glass fiber, basalt fiber and ceramic fiber.

6. The fireproof mud for cable tunnel according to any one of claims 1 to 3, characterized in that: The chlorinated paraffin contains 30 wt%, 40 wt%, 50 wt% or 70 wt% of chlorine.

7. A method for preparing fireproof mud for cable tunnels according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: Grinding kaolin and silicon dioxide under vacuum to obtain a mixture 1 having an average particle size of 1 to 10 μm; Grinding mica, aluminum hydroxide and magnesium hydroxide under vacuum to obtain a mixture 2 with an average particle size of 1 to 5 μm; Mixture 1, mixture 2, polymer emulsion, inorganic fiber, chlorinated paraffin and water glass are kneaded for 20 to 50 minutes in a vacuum and closed condition at a kneading temperature of 60 to 100° C., then cooled to 25 to 35° C. and kneaded for 10 to 20 minutes.

8. The method for preparing fireproof mud for cable tunnel according to claim 7, characterized in that: The banburying temperature is 90-100°C.

9. The method for preparing fireproof mud for cable tunnel according to claim 7, characterized in that: The mixing is carried out in an internal mixer at a rotation speed of 50 to 150 r / min.

10. Use of the fireproof mud according to any one of claims 1 to 6 or the fireproof mud prepared by the preparation method according to any one of claims 7 to 9 as a plugging agent in the cable penetration part of a substation tunnel.