A back-water surface anti-seepage cement-based permeable crystallization waterproof material and its preparation process

Abstract

The present invention discloses a back-water surface anti-seepage cement-based penetrating crystalline waterproof material and a preparation process thereof, and relates to the technical field of waterproof materials. The back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared by the present invention comprises the following components by weight: 40 to 60 parts of cement, 30 to 40 parts of quartz sand, 15 to 25 parts of leveling agent, 0.8 to 1 part of defoaming agent, 0.5 to 2.5 parts of water reducer, 3 to 8 parts of lime, and 8 to 12 parts of gypsum; the cement is sulphoaluminate cement; the leveling agent is composite filler microspheres; the composite filler microspheres are obtained by first impregnating mesoporous silica in 2,4-toluene diisocyanate trimer and then wrapping with polybutyl acrylate; the defoaming agent is aluminum palmitate; the water reducer is melamine formaldehyde resin; the back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared by the present invention has self-healing properties and strong waterproof properties.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof materials, in particular to a back-water-side anti-seepage cement-based permeable crystalline waterproof material and a preparation process thereof. Background Art

[0002] Cement-based penetrating crystalline waterproofing materials react with various oxides in concrete, forming water-insoluble crystals that clog capillary pores. When microcracks develop, secondary crystallization occurs, resulting in denser, more waterproof concrete. Penetrating crystalline waterproofing materials are a new type of material suitable for waterproofing and repairing in construction projects. They are user-friendly and a preferred choice. They align with the research and development direction of functional green building materials and are a hot topic in waterproofing technology research both domestically and internationally.

[0003] Compared with traditional waterproof materials, penetrating crystallization waterproof materials have good compatibility with concrete substrates, no aging risks, and no volatile gas release. Moisture-proof concrete buildings after penetrating crystallization still have breathable properties and can be widely used in industrial, civil, and underground projects. They are especially suitable for backwater treatment in environments such as basements that cannot be treated from the water-facing side.

[0004] However, existing cement-based permeable crystalline waterproof materials have poor waterproofing effects during use and are easily damaged by water seepage once cracks occur in the wall where they are applied. Therefore, there is an urgent need for a cement-based permeable crystalline waterproof material with better waterproofing effects and self-healing properties that is waterproof and impermeable to the back surface. Summary of the Invention

[0005] The purpose of the present invention is to provide a back-water-side anti-seepage cement-based permeable crystalline waterproof material and a preparation process thereof, so as to solve the problems existing in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A back-water surface anti-seepage cement-based penetrating crystalline waterproof material comprises the following components by weight: 40-60 parts of cement, 30-40 parts of quartz sand, 15-25 parts of a leveling agent, 0.8-1 part of a defoaming agent, 0.5-2.5 parts of a water reducer, 3-8 parts of lime, and 8-12 parts of gypsum; the leveling agent uses composite filler microspheres; when a wall cracks, the polybutyl acrylate on the surface of the leveling agent is driven to rupture, and the 2,4-toluene diisocyanate trimer inside the leveling agent flows out and penetrates into the cracked wall; the isocyanate of the 2,4-toluene diisocyanate trimer reacts with the surface of the seeping wall and hydroxyl groups in the pores of mesoporous silica to form a polyurethane network that penetrates the mesoporous silica and fills the cracked wall, thereby further enhancing the waterproof performance of the back-water surface anti-seepage cement-based penetrating crystalline waterproof material and the self-healing performance of the back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0008] Furthermore, the cement includes sulphoaluminate cement.

[0009] Furthermore, the particle size of the quartz sand is 10 to 30 μm.

[0010] Furthermore, the composite filler microspheres are obtained by first impregnating mesoporous silica in 2,4-toluene diisocyanate trimer and then wrapping them with polybutyl acrylate.

[0011] Furthermore, the defoaming agent includes aluminum palmitate; part of the defoaming agent aluminum palmitate reacts with lime and water to form a tricalcium aluminate network in the waterproof material, and the tricalcium aluminate in the cement combines with the tricalcium aluminate network, water and calcium sulfate in the gypsum to form hydrated calcium sulfoaluminate needle crystals on the surface of the cement particles, forming a protective film, which prevents moisture from entering the interior of the cement particles, thereby achieving a waterproof effect.

[0012] Furthermore, the water reducing agent includes melamine formaldehyde resin.

[0013] Furthermore, a preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material comprises the following preparation steps:

[0014] (1) Ingredients: The ingredients are prepared according to the components and mass fractions of the back water surface anti-seepage cement-based permeable crystalline waterproof material according to any one of claims 1 to 6;

[0015] (2) The ingredients of step (1) are stirred and mixed at 60-80 r / min, and then put into a powder ball mill for grinding and sieving to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0016] Furthermore, the particle size of the cement in step (1) is 20 to 30 μm.

[0017] Furthermore, the preparation method of the composite filler microspheres in step (1) is as follows: immersing mesoporous silica with a particle size of 20 to 40 μm in 2,4-toluene diisocyanate trimer with a mass of 10 to 30 times that of the mesoporous silica, ultrasonicating at 20 to 40 kHz for 5 to 10 minutes, then letting it stand for 2 to 4 hours, fishing it out, and mixing it with polybutyl acrylate with a mass of 6 to 8 times that of the mesoporous silica in an internal mixer at 120 to 140°C for 20 to 40 minutes, then placing it in a twin-screw extruder, extruding and granulating it at a temperature of 140 to 160°C, and air-cooling it to obtain composite filler microspheres with a diameter of 40 to 80 μm.

[0018] Furthermore, the mesh size of the sieve is 200 meshes.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The back-water surface anti-seepage cement-based permeable crystallization waterproof material prepared by the present invention comprises cement, quartz sand, a leveling agent, a defoaming agent, a water reducer, lime, and gypsum; the cement is sulphoaluminate cement; the leveling agent is composite filler microspheres; the composite filler microspheres are obtained by first impregnating mesoporous silica in 2,4-toluene diisocyanate trimer and then wrapping them with polybutyl acrylate; the defoaming agent is aluminum palmitate; and the water reducer is melamine formaldehyde resin.

[0021] During use, part of the defoaming agent aluminum palmitate reacts with lime and water to form a tricalcium aluminate network in the waterproof material. The tricalcium aluminate in the cement combines with the tricalcium aluminate network, water and calcium sulfate in the gypsum to form hydrated calcium sulfoaluminate needle crystals on the surface of the cement particles, forming a protective film to prevent moisture from entering the interior of the cement particles, thereby achieving a waterproof effect; when the wall cracks, it drives the polybutyl acrylate on the surface of the leveling agent to rupture, and the 2,4-toluene diisocyanate trimer inside the leveling agent flows out and penetrates into the cracked wall. The isocyanate of the 2,4-toluene diisocyanate trimer reacts with the surface of the seeping wall and the hydroxyl groups in the mesoporous silica pores to form a polyurethane network that penetrates the mesoporous silica and fills the cracked wall, further enhancing the waterproof performance of the back-water surface anti-seepage cement-based penetrating crystalline waterproof material while enhancing the self-healing performance of the back-water surface anti-seepage cement-based penetrating crystalline waterproof material. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of the back surface anti-seepage cement-based permeable crystalline waterproof material prepared in the following examples as follows:

[0024] Waterproofness: Take the same mass of the back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared in the embodiment and the comparative example and mix it with water 0.6 times its mass, stir it at 70r / min for 15min, and measure the 28d anti-seepage pressure, the second anti-seepage pressure (56d), and the penetration pressure ratio (28d) according to GB18445.

[0025] Example 1

[0026] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0027] (1) Ingredients: The ingredients are prepared according to the following components and weight proportions: 40 parts of cement, 30 parts of quartz sand, 15 parts of leveling agent, 0.8 parts of defoaming agent, 0.5 parts of water reducing agent, 3 parts of lime, and 8 parts of gypsum; wherein the cement is sulphoaluminate cement with a particle size of 20 μm, the particle size of quartz sand is 10 μm, the defoaming agent is aluminum palmitate, the leveling agent is composite filler microspheres, and the water reducing agent is melamine formaldehyde resin;

[0028] (2) The ingredients of step (1) were stirred and mixed at 60 r / min, and then put into a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0029] The preparation method of the composite filler microspheres in step (1) is as follows: immerse mesoporous silica with a particle size of 20 μm in 2,4-toluene diisocyanate trimer with a mass 10 times that of the mesoporous silica, ultrasonicate at 20 kHz for 5 minutes, then let it stand for 2 hours, fish it out, put it into a 120°C internal mixer together with polybutyl acrylate with a mass 6 times that of the mesoporous silica, and mix it for 20 minutes. Then put it into a twin-screw extruder, extrude and granulate it at a temperature of 140°C, and air-cool it to obtain composite filler microspheres with a diameter of 40 μm.

[0030] Example 2

[0031] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0032] (1) Ingredients: The ingredients are prepared according to the following components and weight proportions: 50 parts of cement, 35 parts of quartz sand, 20 parts of leveling agent, 0.9 parts of defoaming agent, 1.5 parts of water reducing agent, 5 parts of lime, and 10 parts of gypsum; wherein the cement is sulphoaluminate cement with a particle size of 25 μm, the particle size of quartz sand is 20 μm, the defoaming agent is aluminum palmitate, the leveling agent is composite filler microspheres, and the water reducing agent is melamine formaldehyde resin;

[0033] (2) The ingredients of step (1) were stirred and mixed at 70 r / min, and then placed in a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0034] The preparation method of the composite filler microspheres in step (1) is as follows: immerse mesoporous silica with a particle size of 30 μm in 2,4-toluene diisocyanate trimer with a mass 20 times that of the mesoporous silica, ultrasonicate at 30 kHz for 7 minutes, then let it stand for 3 hours, fish it out, put it into a 130°C internal mixer together with polybutyl acrylate with a mass 7 times that of the mesoporous silica, and mix it for 30 minutes. Then put it into a twin-screw extruder, extrude and granulate it at a temperature of 150°C, and air-cool it to obtain composite filler microspheres with a diameter of 60 μm.

[0035] Example 3

[0036] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0037] (1) Ingredients: The ingredients are prepared according to the following components and weight proportions: 60 parts of cement, 40 parts of quartz sand, 25 parts of leveling agent, 1 part of defoaming agent, 2.5 parts of water reducing agent, 8 parts of lime, and 12 parts of gypsum; wherein the cement is sulphoaluminate cement with a particle size of 30 μm, the particle size of quartz sand is 30 μm, the defoaming agent is aluminum palmitate, the leveling agent is composite filler microspheres, and the water reducing agent is melamine formaldehyde resin;

[0038] (2) The ingredients of step (1) were stirred and mixed at 80 r / min, and then put into a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0039] The preparation method of the composite filler microspheres in step (1) is as follows: immerse mesoporous silica with a particle size of 40 μm in 2,4-toluene diisocyanate trimer with a mass 30 times that of the mesoporous silica, ultrasonicate at 40 kHz for 10 minutes, then let it stand for 4 hours, fish it out, put it into a 140°C internal mixer together with polybutyl acrylate with a mass 8 times that of the mesoporous silica, and mix it for 40 minutes. Then put it into a twin-screw extruder, extrude and granulate it at a temperature of 160°C, and air-cool it to obtain composite filler microspheres with a diameter of 80 μm.

[0040] Comparative Example 1

[0041] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0042] (1) Ingredients: The ingredients are prepared according to the following components and parts by mass: 50 parts of cement, 35 parts of quartz sand, 20 parts of leveling agent, 0.9 parts of defoaming agent, 1.5 parts of water reducing agent, 5 parts of lime, and 10 parts of gypsum; wherein, the cement is silicate cement with a particle size of 25 μm, the particle size of quartz sand is 20 μm, the defoaming agent is aluminum palmitate, the leveling agent is composite filler microspheres, and the water reducing agent is melamine formaldehyde resin;

[0043] (2) The ingredients of step (1) were stirred and mixed at 70 r / min, and then placed in a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0044] The preparation method of the composite filler microspheres in step (1) is as follows: immerse mesoporous silica with a particle size of 30 μm in 2,4-toluene diisocyanate trimer with a mass 20 times that of the mesoporous silica, ultrasonicate at 30 kHz for 7 minutes, then let it stand for 3 hours, fish it out, put it into a 130°C internal mixer together with polybutyl acrylate with a mass 7 times that of the mesoporous silica, and mix it for 30 minutes. Then put it into a twin-screw extruder, extrude and granulate it at a temperature of 150°C, and air-cool it to obtain composite filler microspheres with a diameter of 60 μm.

[0045] Comparative Example 2

[0046] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0047] (1) Ingredients: The ingredients are prepared according to the following components and weight proportions: 50 parts of cement, 35 parts of quartz sand, 20 parts of leveling agent, 0.9 parts of defoaming agent, 1.5 parts of water reducing agent, 5 parts of lime, and 10 parts of gypsum; wherein, the cement is sulphoaluminate cement with a particle size of 25 μm, the particle size of quartz sand is 20 μm, the defoaming agent is melamine cyanurate chloride, the leveling agent is composite filler microspheres, and the water reducing agent is melamine formaldehyde resin;

[0048] (2) The ingredients of step (1) were stirred and mixed at 70 r / min, and then placed in a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0049] The preparation method of the composite filler microspheres in step (1) is as follows: immerse mesoporous silica with a particle size of 30 μm in 2,4-toluene diisocyanate trimer with a mass 20 times that of the mesoporous silica, ultrasonicate at 30 kHz for 7 minutes, then let it stand for 3 hours, fish it out, put it into a 130°C internal mixer together with polybutyl acrylate with a mass 7 times that of the mesoporous silica, and mix it for 30 minutes. Then put it into a twin-screw extruder, extrude and granulate it at a temperature of 150°C, and air-cool it to obtain composite filler microspheres with a diameter of 60 μm.

[0050] Comparative Example 3

[0051] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0052] (1) Ingredients: The ingredients are prepared according to the following components and weight proportions: 50 parts of cement, 35 parts of quartz sand, 20 parts of leveling agent, 0.9 parts of defoaming agent, 1.5 parts of water reducing agent, 5 parts of lime, and 10 parts of gypsum; wherein, the cement is sulphoaluminate cement with a particle size of 25 μm, the particle size of quartz sand is 20 μm, the defoaming agent is aluminum palmitate, the leveling agent is powder leveling agent RB505, and the water reducing agent is melamine formaldehyde resin;

[0053] (2) The ingredients of step (1) were stirred and mixed at 70 r / min, and then placed in a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0054] Comparative Example 4

[0055] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0056] (1) Ingredients: The ingredients are prepared according to the following components and weight proportions: 50 parts of cement, 35 parts of quartz sand, 20 parts of leveling agent, 0.9 parts of defoaming agent, 1.5 parts of water reducing agent, and 10 parts of gypsum; wherein the cement is sulphoaluminate cement with a particle size of 25 μm, the particle size of quartz sand is 20 μm, the defoaming agent is aluminum palmitate, the leveling agent is composite filler microspheres, and the water reducing agent is melamine formaldehyde resin;

[0057] (2) The ingredients of step (1) were stirred and mixed at 70 r / min, and then placed in a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0058] The preparation method of the composite filler microspheres in step (1) is as follows: immerse mesoporous silica with a particle size of 30 μm in 2,4-toluene diisocyanate trimer with a mass 20 times that of the mesoporous silica, ultrasonicate at 30 kHz for 7 minutes, then let it stand for 3 hours, fish it out, put it into a 130°C internal mixer together with polybutyl acrylate with a mass 7 times that of the mesoporous silica, and mix it for 30 minutes. Then put it into a twin-screw extruder, extrude and granulate it at a temperature of 150°C, and air-cool it to obtain composite filler microspheres with a diameter of 60 μm.

[0059] Comparative Example 5

[0060] A preparation process of a back-water-side anti-seepage cement-based permeable crystalline waterproof material, comprising the following preparation steps:

[0061] (1) Ingredients: The ingredients are prepared according to the following components and weight proportions: 50 parts of cement, 35 parts of quartz sand, 20 parts of leveling agent, 0.9 parts of defoaming agent, 1.5 parts of water reducing agent, and 5 parts of lime; wherein the cement is sulphoaluminate cement with a particle size of 25 μm, the particle size of quartz sand is 20 μm, the defoaming agent is aluminum palmitate, the leveling agent is composite filler microspheres, and the water reducing agent is melamine formaldehyde resin;

[0062] (2) The ingredients of step (1) were stirred and mixed at 70 r / min, and then placed in a powder ball mill for grinding and passed through a 200-mesh sieve to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

[0063] The preparation method of the composite filler microspheres in step (1) is as follows: immerse mesoporous silica with a particle size of 30 μm in 2,4-toluene diisocyanate trimer with a mass 20 times that of the mesoporous silica, ultrasonicate at 30 kHz for 7 minutes, then let it stand for 3 hours, fish it out, put it into a 130°C internal mixer together with polybutyl acrylate with a mass 7 times that of the mesoporous silica, and mix it for 30 minutes. Then put it into a twin-screw extruder, extrude and granulate it at a temperature of 150°C, and air-cool it to obtain composite filler microspheres with a diameter of 60 μm.

[0064] Effect Examples

[0065] Table 1 below shows the analysis results of the waterproof properties of the back-water surface anti-seepage cement-based permeable crystalline waterproof materials prepared using Examples 1 to 3 of the present invention and Comparative Examples 1 to 5.

[0066] Table 1

[0067]

[0068] It can be found from Table 1 that the back surface anti-seepage cement-based penetrating crystalline waterproof materials prepared in Examples 1, 2, and 3 have strong waterproof properties; from the comparison of the experimental data of Examples 1, 2, and 3 and Comparative Example 1, it can be found that the use of sulphoaluminate cement to prepare the back surface anti-seepage cement-based penetrating crystalline waterproof material can form hydrated calcium sulphoaluminate needle-shaped crystals, and the obtained back surface anti-seepage cement-based penetrating crystalline waterproof material has strong waterproof properties; from the experimental data of Examples 1, 2, and 3 and Comparative Example 2, it can be found that the use of aluminum palmitate to prepare the back surface anti-seepage cement-based penetrating crystalline waterproof material can form a tricalcium aluminate network, and the obtained back surface anti-seepage cement-based penetrating crystalline waterproof material has strong waterproof properties; from the experimental data of Examples 1, 2, and 3 and Comparative Example 3 From the experimental data, it can be found that the back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared by using composite filler microspheres has a stronger waterproof property; from the experimental data of Examples 1, 2, 3 and Comparative Example 4, it can be found that the back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared by using lime can form a tricalcium aluminate network, and the back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared has a stronger waterproof property; from the experimental data of Examples 1, 2, 3 and Comparative Example 5, it can be found that the back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared by using gypsum can form hydrated calcium sulfoaluminate needle-shaped crystals, and the back-water surface anti-seepage cement-based penetrating crystalline waterproof material prepared has a stronger waterproof property.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A back-water surface anti-seepage cement-based permeable crystallization waterproof material, characterized in that: The following components are included in parts by weight: 40-60 parts of cement, 30-40 parts of quartz sand, 15-25 parts of leveling agent, 0.8-1 part of defoaming agent, 0.5-2.5 parts of water reducer, 3-8 parts of lime, and 8-12 parts of gypsum; the leveling agent uses composite filler microspheres; the composite filler microspheres are obtained by first impregnating mesoporous silica in 2,4-toluene diisocyanate trimer and then wrapping them with polybutyl acrylate; the defoaming agent includes aluminum palmitate.

2. The back surface anti-seepage cement-based permeable crystallization waterproof material according to claim 1, characterized in that: The cement includes sulphoaluminate cement.

3. The back surface anti-seepage cement-based permeable crystallization waterproof material according to claim 1, characterized in that: The particle size of the quartz sand is 10 to 30 μm.

4. The back surface anti-seepage cement-based permeable crystallization waterproof material according to claim 1, characterized in that: The water reducing agent includes melamine formaldehyde resin.

5. A preparation process for a back-water surface anti-seepage cement-based permeable crystalline waterproof material, characterized in that: The method comprises the following preparation steps: (1) Ingredients: The ingredients are prepared according to the components and mass fractions of the back water surface anti-seepage cement-based permeable crystalline waterproof material according to any one of claims 1 to 4; (2) The ingredients of step (1) are stirred and mixed at 60-80 r / min, and then put into a powder ball mill for grinding and sieving to obtain a back-water surface anti-seepage cement-based penetrating crystalline waterproof material.

6. The preparation process of the back water surface anti-seepage cement-based permeable crystallization waterproof material according to claim 5, characterized in that: The particle size of the cement in step (1) is 20 to 30 μm.

7. The preparation process of the back water surface anti-seepage cement-based permeable crystallization waterproof material according to claim 5, characterized in that: The preparation method of the composite filler microspheres in step (1) is as follows: immersing mesoporous silica with a particle size of 20 to 40 μm in 2,4-toluene diisocyanate trimer with a mass of 10 to 30 times that of the mesoporous silica, ultrasonicating at 20 to 40 kHz for 5 to 10 minutes, then letting it stand for 2 to 4 hours, fishing it out, and mixing it with polybutyl acrylate with a mass of 6 to 8 times that of the mesoporous silica in an internal mixer at 120 to 140° C. for 20 to 40 minutes, then placing it in a twin-screw extruder, extruding and granulating it at a temperature of 140 to 160° C., and air-cooling it to obtain composite filler microspheres with a diameter of 40 to 80 μm.

8. The preparation process of the back water surface anti-seepage cement-based permeable crystallization waterproof material according to claim 5, characterized in that: The mesh size of the sieve is 200 meshes.

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