Anti-freezing and anti-ultraviolet super-hydrophobic cement mortar and preparation method thereof

Abstract

The invention discloses anti-freezing and anti-ultraviolet super-hydrophobic cement mortar and a preparation method thereof.The super-hydrophobic cement mortar is prepared from, by mass, 0.66 parts to 2.02 parts of isobutyl triethoxy silane, 38.91 parts to 51.28 parts of sand, 0.17 parts to 0.81 parts of titanium dioxide, 32.57 parts to 41.24 parts of cement and 13.47 parts to 19.8 parts of water, and the sum of the mass parts of the isobutyl triethoxy silane, the sand, the titanium dioxide, the cement and the water is 100. Therefore, the hydrophobic cement mortar has excellent hydrophobic performance, freeze-thaw resistance and ultraviolet resistance, and the preparation method is simple, environmentally friendly, free of pollution and wide in application range.

Description

Technical Field

[0001] The present application relates to the technical field of inorganic non-metallic materials, and in particular to a freeze-resistant and UV-resistant super-hydrophobic cement mortar and a preparation method thereof. Background Art

[0002] Cement-based materials have become one of the most widely used building materials in the world due to their excellent mechanical properties, simple preparation and use methods, and low cost. In water conservancy projects and other important infrastructure, the most common damage to cement-based materials including concrete in their use scenarios includes wear damage, chemical erosion, permeability damage, and freeze-thaw damage. Research and analysis of the mechanism of action of these damage phenomena have found that the reduction in the durability of these cement-based materials is directly or indirectly related to the water that penetrates into the material. Cement-based materials are hydrophilic materials. Therefore, in hydraulic construction applications, water that comes into contact with cement-based materials can easily adhere to the surface of the material and penetrate into the interior. Long-term accumulation will lead to damage to the surface and interior of the cement-based materials. How to ensure the efficient operation of cement-based materials in water environments is a key issue.

[0003] Currently, most protective materials used in my country's water conservancy and hydropower projects are organic polymers, such as epoxy resins, polyureas, and polyurethanes. However, these materials can suffer from varying degrees of bubbling and tearing in long-term humid environments. Furthermore, as my country's water conservancy and hydropower construction continues to move toward higher altitudes, these materials are unable to withstand the cold and high UV radiation conditions found at high altitudes. Therefore, there is an urgent need to improve the materials' resistance to water and UV radiation to meet the long-term operational requirements of cement-based materials in high-altitude water conservancy and hydropower projects.

[0004] It should be noted that the above statements are only used to provide background technical information related to this application and do not necessarily constitute prior art. Summary of the Invention

[0005] In a first aspect of the present application, a super-hydrophobic cement mortar is provided, comprising, based on 100 parts by mass, 0.66-2.02 parts of isobutyltriethoxysilane, 38.91-51.28 parts of sand, 0.17-0.81 parts of titanium dioxide, 32.57-41.24 parts of cement, and 13.47-19.8 parts of water. Thus, the super-hydrophobic cement mortar has excellent hydrophobicity, freeze-thaw resistance, and UV resistance.

[0006] In addition, the super-hydrophobic cement mortar according to the above embodiment of the present application may also have the following additional technical features:

[0007] In some embodiments of the present application, the average diameter of the titanium dioxide is 20 nm to 50 nm. Thus, the titanium dioxide has a high specific surface area and a rich surface microstructure, which is beneficial for improving the hydrophobicity of the superhydrophobic cement mortar.

[0008] In some embodiments of the present application, the diameter of the sand is 0.1 mm to 0.25 mm, which is beneficial for improving the density of the super-hydrophobic cement mortar while ensuring the strength.

[0009] In some embodiments of the present application, the cement comprises ordinary Portland cement with a strength grade of P.O.42.5, thereby facilitating the improvement of the strength of the super-hydrophobic cement mortar.

[0010] In a second aspect of the present application, the present application proposes a method for preparing super-hydrophobic cement mortar, comprising:

[0011] mixing isobutyltriethoxysilane with water to obtain a liquid mixture;

[0012] mixing sand, titanium dioxide, and cement to obtain a solid mixture;

[0013] mixing the liquid mixture with the solid mixture to obtain a cement slurry;

[0014] The cement slurry is poured into a mold and vibrated. After the vibration, the surface of the cement slurry is covered with a copper mesh to obtain the super-hydrophobic cement mortar.

[0015] The above method of the present application is simple to operate and can obtain super-hydrophobic cement mortar with excellent hydrophobicity and durability, which is conducive to practical application in engineering and has a wide range of applications.

[0016] In some embodiments of the present application, the mass ratio of the isobutyltriethoxysilane to the cement is (0.02-0.05:1), which is beneficial for ensuring the strength of the superhydrophobic cement mortar, reducing the surface energy of the superhydrophobic cement mortar, and improving the hydrophobicity of the superhydrophobic cement mortar.

[0017] In some embodiments of the present application, the mass ratio of the sand to the titanium dioxide is 1:(0.005-0.02), thereby improving the density and hydrophobicity of the super-hydrophobic cement mortar.

[0018] In some embodiments of the present application, the mass ratio of the sand to the cement is (1-1.5): 1. This is beneficial to improving the strength and durability of the superhydrophobic cement mortar.

[0019] In some embodiments of the present application, the mass ratio of the liquid mixture to the solid mixture is (0.4-0.5): 1. This is conducive to more effectively modifying the solid mixture, thereby improving the strength and hydrophobicity of the superhydrophobic cement mortar.

[0020] In some embodiments of the present application, the method for preparing super-hydrophobic cement mortar further includes curing the super-hydrophobic cement mortar in a standard curing room at a temperature of 20°C-25°C and a relative humidity of 90%-95% for 3-7 days, and then drying it at room temperature to obtain a super-hydrophobic cement mortar block. This facilitates the full hydration of the cement, thereby obtaining a super-hydrophobic cement mortar block having a certain strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 This is a flow chart for preparing super-hydrophobic cement mortar according to one embodiment of the present application;

[0023] Figure 2 This is a picture of the surface contact angle of the super-hydrophobic cement mortar block prepared in Example 3 of the present application;

[0024] Figure 3 This is a picture of the water droplet rolling effect on the surface of the super-hydrophobic cement mortar block prepared in Example 3 of the present application;

[0025] Figure 4 This is a picture of microscopic particles inside the super-hydrophobic cement mortar block prepared in Example 3 of the present application;

[0026] Figure 5 This is a comparison chart of the immersion water absorption rate of the super-hydrophobic cement mortar block prepared in Example 3 of the present application and the ordinary cement mortar block prepared in Comparative Example 1;

[0027] Figure 6 This is a comparison of the mortar mass loss rate after freeze-thaw cycles of the super-hydrophobic cement mortar block prepared in Example 3 of the present application and the ordinary cement mortar block prepared in Comparative Example 1;

[0028] Figure 7 This is a comparison picture of the changes in the surface contact angle of the super-hydrophobic cement mortar blocks prepared in Example 3 of the present application and Comparative Example 2 under ultraviolet light irradiation. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present application in detail. Examples of the embodiments are shown in the accompanying drawings, but unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially identical structures may be omitted. This is to avoid unnecessary lengthiness in the following description and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; unless otherwise specified, the numerical values ​​of the various parameters mentioned in this application can be measured using various measurement methods commonly used in the art (for example, they can be tested according to the methods given in the embodiments of this application).

[0031] The terms "include" and "have" in the description and claims of this application and any variations thereof are open expressions, that is, including the contents specified in this application but not excluding other contents.

[0032] In the description of this application, regardless of whether the word "about" or "approximately" is used, all numbers disclosed herein are approximate values. The value of each number may vary by less than 10% or by a reasonable difference considered by a person skilled in the art, such as 1%, 2%, 3%, 4% or 5%.

[0033] " range " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be to include end value or not include end value, and can be arbitrarily combined, that is, any lower limit can form a range with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for specific parameters, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 are listed, and if the maximum range value 3,4 and 5 are listed, then the following range can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise specified, the numerical range " ab " represents the abbreviation of any real number combination between a and b, wherein a and b are all real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0034] In this application, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic. Unless otherwise specified, all steps of this application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), indicating that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0035] At present, the methods for improving the hydrophobicity of cement-based materials are mainly divided into two categories: surface hydrophobic modification and overall hydrophobic modification. In the related surface modification technology, a super-hydrophobic surface with a contact angle of up to 162° is prepared by spraying a nano-silica suspension modified with polymethylhydrogensiloxane onto the surface of concrete. However, after the surface is damaged, the hydrophobicity of the material will drop significantly. Overall modification constructs a rough surface by incorporating low-surface-energy octyltriethoxysiloxane to prepare a low-cost super-hydrophobic concrete coating with a contact angle of up to 161°, but the large amount of hydrophobic agent added will affect the strength development of cement-based materials. Therefore, there is an urgent need to develop a method that can simultaneously improve the overall hydrophobicity and durability of cement-based materials and ensure a wide range of applications.

[0036] In this application, a super-hydrophobic cement mortar with excellent hydrophobicity, freeze-thaw resistance and UV resistance was prepared by adding isobutyltriethoxysilane and titanium dioxide, providing certain technical support for the application of protective materials in high-altitude areas.

[0037] In the first aspect of the present application, the present application proposes a super-hydrophobic cement mortar, which is calculated by 100 parts by mass, including 0.66-2.02 parts of isobutyltriethoxysilane, 38.91-51.28 parts of sand, 0.17-0.81 parts of titanium dioxide, 32.57-41.24 parts of cement, and 13.47-19.8 parts of water. The present application reduces the surface energy of super-hydrophobic cement mortar by adding isobutyltriethoxysilane. After isobutyltriethoxysilane is hydrolyzed, its hydrolyzate will carry three hydroxyl groups (-OH), which can be connected to the cement surface by dehydration condensation reaction with the hydroxyl groups on the cement surface, and these hydrolyzates carry low surface energy functional groups -CH2 and -CH3, forming a hydrophobic film on the cement surface, thereby improving the hydrophobic properties of super-hydrophobic cement mortar. Adding titanium dioxide simultaneously improves the roughness of super-hydrophobic cement mortar, on the one hand part of titanium dioxide is distributed on the surface of super-hydrophobic cement mortar, titanium dioxide has high specific surface area and abundant surface microstructure to help construct the rough structure of surface, reduces the contact area on the surface of water droplets and super-hydrophobic cement mortar, reaches the purpose of improving hydrophobicity; On the other hand part of titanium dioxide fills the pores of nanometer level inside super-hydrophobic cement mortar, this not only makes super-hydrophobic cement mortar more dense, reduces water absorption rate, also improves the roughness of super-hydrophobic cement mortar on micro-nano size, reaches the effect of improving hydrophobicity; At the same time, the addition of titanium dioxide balances the impact of using isobutyltriethoxysilane as hydrophobizing agent on cement-based material strength to a certain extent. In addition, the appropriate addition of sand, cement and water is conducive to improving the strength and durability of super-hydrophobic cement mortar. Thus, the hydrophobic cement mortar has excellent hydrophobicity, freeze-thaw resistance and UV resistance.

[0038] In addition, the super-hydrophobic cement mortar according to the above embodiment of the present application may also have the following additional technical features:

[0039] In some embodiments of the present application, the average diameter of titanium dioxide is 20 nm to 50 nm, for example, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, or 50 nm, etc. Thus, the titanium dioxide has a high specific surface area and a rich surface microstructure, which is beneficial to improving the hydrophobicity of superhydrophobic cement mortar.

[0040] In some embodiments of the present application, the diameter of the sand is 0.1 mm-0.25 mm, for example, 0.1 mm, 0.15 mm, 0.2 mm or 0.25 mm, etc. This is beneficial for improving the density of the super-hydrophobic cement mortar while ensuring the strength.

[0041] In some embodiments of the present application, the cement comprises ordinary Portland cement with a strength grade of P.O.42.5, thereby facilitating the improvement of the strength of the super-hydrophobic cement mortar.

[0042] In the second aspect of the present application, the present application proposes a method for preparing super hydrophobic cement mortar, referring to Figure 1 , the method comprising:

[0043] S1: Mix isobutyltriethoxysilane with water to obtain a liquid mixture.

[0044] As an example, isobutyltriethoxysilane can be mixed with deionized water and dispersed using a high-speed homogenizer with a rotation speed set to 8000 rpm and a dispersion time of 5 minutes to obtain a liquid mixture.

[0045] In some embodiments of the present application, the mass ratio of isobutyltriethoxysilane to cement is (0.02-0.05:1), for example, 0.02:1, 0.03:1, 0.04:1, or 0.05:1. This helps to ensure the strength of the superhydrophobic cement mortar, reduce the surface energy of the superhydrophobic cement mortar, and improve the hydrophobicity of the superhydrophobic cement mortar.

[0046] S2: Mix sand, titanium dioxide and cement to obtain a solid mixture.

[0047] As an example, sand and titanium dioxide powder may be mixed and stirred with a stirrer for 3 minutes, and then cement is added and stirred for 5 minutes to obtain a solid mixture.

[0048] In some embodiments of the present application, the mass ratio of sand to titanium dioxide is 1:(0.005-0.02), for example, 1:0.005, 1:0.008, 1:0.01, 1:0.015, 1:0.018, or 1:0.02, etc. This is beneficial to improving the density and hydrophobicity of the superhydrophobic cement mortar.

[0049] In some embodiments of the present application, the mass ratio of sand to cement is (1-1.5):1, for example, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, or 1:1.5, etc. This is beneficial to improving the strength and durability of the superhydrophobic cement mortar.

[0050] S3: Mixing the liquid mixture with the solid mixture to obtain cement paste.

[0051] As an example, the liquid mixture obtained in step S1 can be added to the solid mixture obtained in step S2, stirred at a low speed for 3 minutes, and then stirred at a high speed for 3 minutes.

[0052] In some embodiments of the present application, the mass ratio of the liquid mixture to the solid mixture is (0.4-0.5):1, for example, 0.4:1, 0.42:1, 0.44:1, 0.46:1, 0.48:1, or 0.5:1, etc. This facilitates more effective modification of the solid mixture, thereby improving the strength and hydrophobicity of the superhydrophobic cement mortar.

[0053] S4: Pour the cement slurry into a mold and vibrate it. After the vibration, cover the surface of the cement slurry with a copper mesh to obtain a superhydrophobic cement mortar.

[0054] In this step, covering the surface of the cement slurry with a copper mesh can improve the roughness of the super-hydrophobic cement mortar. Specifically, an 80-mesh copper mesh can be used.

[0055] In some embodiments of the present application, the method for preparing super-hydrophobic cement mortar further comprises: placing the super-hydrophobic cement mortar in a standard curing room with a temperature of 20°C-25°C (such as 20°C, 21°C, 22°C, 23°C, 24°C or 25°C, etc.) and a relative humidity of 90%-95% (such as 90%, 91%, 92%, 93%, 94% or 95%, etc.) for curing for 3 days-7 days (such as 3 days, 4 days, 5 days, 6 days or 7 days, etc.), and then drying at room temperature to obtain a super-hydrophobic cement mortar block. Thus, it is beneficial to promote the full hydration of cement, and then obtain a super-hydrophobic cement mortar block with a certain strength.

[0056] The above method of the present application is simple to operate and can obtain super-hydrophobic cement mortar with excellent hydrophobicity and durability, which is conducive to practical application in engineering and ensures its applicability in high-altitude areas.

[0057] The present invention will be described below by way of specific examples. It should be noted that the following examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Where specific techniques or conditions are not specified in the examples, they are determined according to the techniques or conditions described in the literature in this area or according to the product specifications. Reagents or instruments not specified by manufacturer are all commercially available conventional products.

[0058] Example 1

[0059] (1) 0.4 g of isobutyltriethoxysilane was mixed with 7.6 g of deionized water and dispersed using a high-speed homogenizer at a speed of 8000 rpm for 5 min.

[0060] (2) Mix 20 g of fine sand with 0.1 g of nano-titanium dioxide powder, stir with a stirrer for 3 min, then add 20 g of cement and stir for 5 min;

[0061] (3) adding the liquid mixture obtained in step (1) to the solid mixture obtained in step (2), stirring at a low speed for 3 minutes, and then stirring at a high speed for 3 minutes;

[0062] (4) Pour the slurry obtained in step (3) into a mold and vibrate it thoroughly. After the vibration, cover the surface of the cement slurry with an 80-mesh copper mesh;

[0063] (5) The cement mortar after demoulding in step (4) is placed in a standard curing room at 20-25° C. and a relative humidity of 90-95% for curing for 7 days, and then dried at room temperature to obtain a super-hydrophobic cement mortar block.

[0064] The contact angle was measured using a contact angle meter, and the contact angle of the hydrophobic cement mortar block sample was found to be 122.5°.

[0065] The water absorption test of the super-hydrophobic cement mortar blocks showed that the water absorption rate after 45 hours of immersion was 7.65%; the freeze-thaw resistance test of the super-hydrophobic cement mortar blocks showed that the mass loss rate was 2.23% after 48 cycles; the ultraviolet irradiation accelerated test of the super-hydrophobic cement mortar blocks showed that the contact angle was still above 120° after 168 hours.

[0066] Example 2

[0067] The difference from Example 1 is:

[0068] (1) Mix 0.6 g of isobutyltriethoxysilane with 9.4 g of deionized water.

[0069] The contact angle was measured using a contact angle meter, and the contact angle of the hydrophobic cement mortar block sample was found to be 141.3°.

[0070] The water absorption test of the super-hydrophobic cement mortar blocks showed that the water absorption rate after 45 hours of immersion was 6.1%; the freeze-thaw resistance test of the super-hydrophobic cement mortar blocks showed that the mass loss rate was 1.91% after 48 cycles; the ultraviolet irradiation accelerated test of the super-hydrophobic cement mortar blocks showed that the contact angle was still above 140° after 168 hours.

[0071] Example 3

[0072] The difference from Example 1 is:

[0073] (1) Mix 1 g of isobutyltriethoxysilane with 8 g of deionized water;

[0074] (2) Mix 20 g of fine sand with 0.4 g of nano-titanium dioxide powder.

[0075] The contact angle was measured using a contact angle meter, such as Figure 2 As shown, the contact angle of the hydrophobic cement mortar block sample was measured to be 153.2°, and the picture of the water droplet rolling effect on the surface is shown in Figure 3 shown.

[0076] The microscopic particles inside the super hydrophobic cement mortar block are shown in the following figure: Figure 4 shown.

[0077] The water absorption rate of super hydrophobic cement mortar blocks was tested, such as Figure 5 As shown in Figure 2, the water absorption rate after 45 hours of immersion was 5.35%. The freeze-thaw resistance test of super hydrophobic cement mortar blocks was carried out, as shown in Figure 2. Figure 6 As shown in Figure 2, it was found that the mass loss rate was 1.6% after 48 cycles; the ultraviolet irradiation accelerated test was carried out on the super-hydrophobic cement mortar block, as shown in Figure 2. Figure 7 As shown in Figure 3, it was found that after 168 h, the contact angle was still above 150°.

[0078] Comparative Example 1

[0079] (1) Mix 20g of fine sand with 20g of cement and stir in a mixer for 5 minutes;

[0080] (2) adding 9 g of deionized water to the solid mixture obtained in step (1), stirring at a low speed for 3 min, and then stirring at a high speed for 3 min;

[0081] (3) pouring the slurry obtained in step (2) into a mold and vibrating it thoroughly;

[0082] (4) The cement mortar after demoulding in step (3) is placed in a standard curing room at 20-25° C. and a relative humidity of 90-95% for curing for 7 days, and then dried at room temperature to obtain ordinary cement mortar blocks.

[0083] The contact angle was measured using a contact angle meter, and the contact angle of the ordinary hydrophobic cement mortar block sample was found to be 0°.

[0084] Water absorption test was conducted on ordinary cement mortar blocks, e.g. Figure 5 As shown in Figure 2, the water absorption rate after 45 hours of immersion was 10.4%. The freeze-thaw resistance test of ordinary cement mortar blocks was carried out, as shown in Figure 2. Figure 6 As shown, the mass loss rate was found to be 6.8% after 48 cycles.

[0085] Comparative Example 2

[0086] (1) Mix 1 g of isobutyltriethoxysilane with 8 g of deionized water and disperse using a high-speed homogenizer at a speed of 8000 rpm for 5 min.

[0087] (2) Mix 20g of fine sand with 20g of cement and stir in a mixer for 5min;

[0088] (3) adding the liquid mixture obtained in step (1) to the solid mixture obtained in step (2), stirring at a low speed for 3 minutes, and then stirring at a high speed for 3 minutes;

[0089] (4) Pour the slurry obtained in step (3) into a mold and vibrate it thoroughly. After the vibration, cover the surface of the cement slurry with an 80-mesh copper mesh;

[0090] (5) The cement mortar after demoulding in step (4) is placed in a standard curing room at 20-25° C. and a relative humidity of 90-95% for curing for 7 days, and then dried at room temperature to obtain a super-hydrophobic cement mortar block.

[0091] The contact angle was measured using a contact angle meter, and the contact angle of the hydrophobic cement mortar block sample was found to be 150.1°.

[0092] The ultraviolet irradiation accelerated test was carried out on the super-hydrophobic cement mortar blocks, such as Figure 7 As shown in Figure 3, the contact angle began to show a downward trend after 72 hours, and finally dropped below 150° at 168 hours.

[0093] In summary, the super-hydrophobic cement mortar prepared by this method reduces the surface energy while improving the roughness, forming a binary synergistic effect and achieving an excellent hydrophobic modification effect. It also has the advantages of a simple preparation process, environmentally friendly materials and reagents, good freeze-thaw resistance and UV resistance, and has broad application prospects in the protection of hydraulic concrete in high-altitude areas.

[0094] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A super-hydrophobic cement mortar, characterized in that: The sum of parts by mass is 100 parts, including: 0.66 parts to 2.02 parts of isobutyltriethoxysilane, 38.91 parts to 51.28 parts of sand, 0.17 parts to 0.81 parts of titanium dioxide, 32.57 parts to 41.24 parts of cement, and 13.47 parts to 19.8 parts of water.

2. The super-hydrophobic cement mortar according to claim 1, wherein The average diameter of the titanium dioxide is 20nm-50nm.

3. The super-hydrophobic cement mortar according to claim 1 or 2, wherein The diameter of the sand is 0.1 mm to 0.25 mm.

4. The super-hydrophobic cement mortar according to claim 1 or 2, characterized in that The cement comprises ordinary Portland cement with a strength grade of P.O42.

5.

5. A method for preparing the super-hydrophobic cement mortar according to any one of claims 1 to 4, characterized in that: include: mixing isobutyltriethoxysilane with water to obtain a liquid mixture; mixing sand, titanium dioxide, and cement to obtain a solid mixture; mixing the liquid mixture with the solid mixture to obtain a cement slurry; The cement slurry is poured into a mold and vibrated. After the vibration, the surface of the cement slurry is covered with a copper mesh to obtain the super-hydrophobic cement mortar.

6. The method according to claim 5, characterized in that The mass ratio of the isobutyltriethoxysilane to the cement is (0.02-0.05:1).

7. The method according to claim 5, characterized in that The mass ratio of the sand to the titanium dioxide is 1:(0.005-0.02).

8. The method according to claim 5 or 7, characterized in that The mass ratio of the sand to the cement is (1-1.5):

1.

9. The method according to claim 5, characterized in that The mass ratio of the liquid mixture to the solid mixture is (0.4-0.5):

1.

10. The method according to claim 5, characterized in that Also includes: The super-hydrophobic cement mortar is placed in a standard curing room at a temperature of 20° C.-25° C. and a relative humidity of 90%-95% for curing for 3-7 days, and then dried at room temperature to obtain a super-hydrophobic cement mortar block.

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