A method for preparing three-in-one cement-based mortar and its integrated application

Abstract

This invention relates to the field of building materials technology, providing a method for preparing a three-in-one cement-based mortar and its integrated application. The three-in-one cement-based mortar simultaneously possesses waterproof, adhesive, and crack-resistant properties. Its integrated application mainly involves waterproof beams, irregularly shaped water-retaining strips, cable tray repair, wall and floor tile installation, making it more practical and convenient to construct. This invention also discloses the formula and preparation method of the three-in-one cement-based mortar. Through the combined application of recycled aggregate, microwave bone powder, and recycled powder, the mortar is endowed with good gradation and surface properties. In-situ modification of silica with polydopamine results in modified silica with abundant amino and hydroxyl functional groups on its surface, thereby obtaining nano-modified waterborne polyurethane powder. When added to cement-based mortar, this powder can fill the micropores in the mortar, increasing its density and strength, and reducing the risk of cracking.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a method for preparing a three-in-one cement-based mortar and its integrated application. Background Technology

[0002] Mortar is a widely used building material in construction engineering, composed of cementitious materials, fine aggregates, water, and admixtures or additives added to achieve a specific function, mixed in a certain proportion. In construction engineering, it serves to bond, cushion, protect, and transfer stress. Mortar can be categorized by use into masonry mortar, plastering mortar, floor mortar, finishing mortar, decorative mortar, as well as special mortars such as waterproof mortar, anti-corrosion mortar, thermal insulation mortar, repair mortar, and radiation-shielding mortar. Based on the cementitious materials used, it can be classified as lime mortar, cement mortar, cement-mixed mortar, polymer cement mortar, etc. According to the preparation process, it can be divided into on-site mixed mortar and factory-premixed mortar. Based on whether water is added during on-site mixing, it can be divided into dry-mixed mortar and wet-mixed mortar. Currently, the composition and use of mortar at home and abroad have undergone great changes. It is no longer limited to mixing cement, sand and water on site. Instead, it is pre-mixed in factories into products for various purposes, namely dry mortar or dry-mixed mortar, and then brought to the construction site. It has developed into a series of products.

[0003] From a materials science perspective, before applying a topcoat to walls, it's often necessary to apply an interface layer, a waterproof layer, and a leveling layer. While these materials have similar compositions, their properties vary significantly. The same issue arises with floor tiling. Before laying tiles or wood flooring, the differences in the composition and properties of the leveling mortar, waterproof mortar, and interface mortar create multiple material transition layers—interface transition zones. Due to variations in mortar performance and construction techniques, these transition zones often become weak points prone to material damage, potentially leading to cracking, detachment, and peeling at different interfaces. Therefore, developing a multifunctional mortar that simultaneously meets the requirements of waterproofing, adhesion, and crack resistance has become a key research focus. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a three-in-one cement-based mortar and its integrated application, which addresses the shortcomings of the existing technology. The cement mortar prepared by the present invention has three functions: waterproof, crack-resistant and adhesive. It can be used simultaneously for waterproof beams, irregular water-blocking strips, wire trough repair, wall and floor tile laying, making it more practical and convenient to construct.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] An integrated application of a three-in-one cement-based mortar, wherein the three-in-one cement-based mortar, which meets the requirements of waterproofing, bonding and crack resistance, is used in waterproof beams, irregular water-retaining strips, cable tray repair, wall and floor tile laying.

[0007] Preferably, when the three-in-one cement-based mortar is used for repairing waterproof inverted beams, irregular water-blocking strips, and cable trenches, the three-in-one cement-based mortar is mixed with water at a mass ratio of 100:(12-14).

[0008] Preferably, when the three-in-one cement-based mortar is used for wall or floor tile laying, the three-in-one cement-based mortar is mixed with water at a mass ratio of 100:(14-22).

[0009] Preferably, the conditions for mixing the three-in-one cement-based mortar with water are as follows: first, stir slowly for 120 seconds, then let it stand for 60 seconds, then stir quickly for 120 seconds, and let it stand for 5-15 minutes before use.

[0010] To better address the aforementioned technical problems, the present invention also discloses the following technical solutions:

[0011] A method for preparing a three-in-one cement-based mortar, characterized by comprising the following steps:

[0012] S1: Add ordinary silicate cement, recycled aggregate, mineral admixture, and nano-modified waterborne polyurethane powder to mixing bin one in sequence according to the proportion, and carry out primary mixing to obtain material A;

[0013] S2: Add microwave bone powder, recycled powder, VAE latex powder, water-retaining thickener and water-reducing agent to mixing bin two according to the ratio, and carry out primary mixing to obtain material B;

[0014] S3: Add the above-mentioned A and B materials to the mixing bin three for secondary mixing to obtain three-in-one cement-based mortar.

[0015] Preferably, the mixing time during the preparation of material A is ≥30s; the mixing time during the preparation of material B is ≥60s; and the time during secondary mixing is ≥180s.

[0016] Preferably, the amounts of each component in the three-in-one cement-based mortar, by weight, are as follows:

[0017] 15-55 parts ordinary silicate cement, 45-60 parts recycled aggregate, 1-5 parts microwave bone powder, 8-10 parts mineral admixture, 1-2 parts nano-modified waterborne polyurethane powder, 5-15 parts recycled powder, 2-20 parts VAE latex powder, 0.5-2 parts water-retaining and thickening material, and 1-3 parts water-reducing agent.

[0018] Preferably, the recycled aggregate is recycled fine aggregate for concrete and mortar, the average particle size of the recycled aggregate is not greater than 4.75 mm and not less than 0.30 mm, and the fineness modulus is 2.5-3.2; and / or the microwave power during the preparation of the microwave aggregate is 550-700 W and the time is 3-6 min; and / or the recycled powder includes concrete and mortar construction waste powder, and its fineness modulus is 325-500 mesh.

[0019] Preferably, the preparation method of the nano-modified waterborne polyurethane powder includes the following steps:

[0020] (1) Add dopamine hydrochloride to Tris-HCl buffer solution with pH 8.5. The mass ratio of dopamine hydrochloride to Tris-HCl buffer solution is 1-4:200-400 to obtain a dopamine solution. Mix tetraethyl orthosilicate, ethanol, and deionized water in a volume ratio of 2:20-25:5-6. Then add 25wt% ammonia water to adjust the pH of the solution to 8. Stir the reaction at room temperature and 200-500rpm for 2-3h. After the reaction is completed, add the above dopamine solution. Control the amount of dopamine added to be 0.3-0.5 times the mass of tetraethyl orthosilicate. Perform ultrasonic dispersion treatment at 200-300W for 1.5-2.5h. Then centrifuge. After centrifugation and drying of the precipitate, modified silica is obtained.

[0021] (2) The dehydrated isophorone diisocyanate and polyethylene glycol 400 were added to the reactor and stirred to control the NCO / OH ratio at 1.5. Then, 1-10% of the mass of polyethylene glycol 400 platinum catalyst and 20-30% of the mass of isophorone diisocyanate 2,2-dimethylolpropionic acid were added. The reaction was carried out at 60-70℃ for 3-5 hours. When the viscosity increased during the reaction, N-methylpyrrolidone was added to adjust the viscosity of the reaction system to below 600 mPa·s. After the reaction was completed, the temperature was lowered to 50-60℃, and a 10% concentration of N-methylpyrrolidone was added. A 15wt% triethylamine solution was prepared, with the amount of triethylamine added controlled at 40-45wt% of the mass of polyethylene glycol 400. The reaction was continued for 0.5-1h. Then, 1-50% of the mass of polyethylene glycol 400 KH792 was slowly added, and the reaction was continued for 1-1.5h. After the reaction was completed, the reaction solution was cooled to room temperature to obtain an aqueous polyurethane emulsion. Modified silica was added to the above aqueous polyurethane emulsion, with the amount of modified silica controlled at 0.5-1.5% of the solid mass in the aqueous polyurethane emulsion. After drying, modified aqueous polyurethane powder was obtained.

[0022] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] (1) This invention provides a three-in-one cement-based mortar, comprising ordinary silicate cement, recycled aggregate, microwave bone meal, mineral admixture, recycled powder, VAE latex powder, water-retaining and thickening material, water-reducing agent, and nano-modified waterborne polyurethane powder. This invention optimizes the dosage of each component and mixes the raw materials in separate compartments during mixing, employing a multi-stage mixing method to ensure thorough and uniform mixing of all components. The resulting cement-based mortar possesses three-in-one functions: waterproofing, crack resistance, and adhesion. It has multiple integrated applications, including waterproof beams, irregularly shaped water-blocking strips, cable tray repair, and wall and floor tile installation.

[0024] (2) In the three-in-one cement-based mortar provided by this invention, cement, as the main binder, provides the basic structural strength and bonding performance. Cement forms hydrates during the hydration reaction, which increase the strength and rigidity of the mortar. The use of recycled aggregates, composed of recycled concrete or recycled mortar aggregates, not only reduces resource waste but also improves the workability and bonding properties of the mortar, while enhancing its crack resistance. Microwave-treated aggregate powder can improve the rheological properties of the mortar and increase its compressive strength. It helps to form a more uniform internal structure, thereby enhancing the overall mechanical properties. The addition of mineral admixtures can improve the hydration characteristics of cement, enhance the durability of the mortar, and reduce the coefficient of thermal expansion, thus reducing the risk of cracking. Recycled powder can provide additional bonding force, enhance the overall stability of the mortar, and improve its impermeability and crack resistance. VAE latex powder can provide good elasticity and toughness while improving the bonding performance of the mortar. It helps to reduce drying shrinkage and further improve crack resistance.

[0025] (3) The nano-modified waterborne polyurethane powder added to the mortar in this invention is first modified in situ with polydopamine to modify silica. The surface of the modified silica has abundant amino and hydroxyl functional groups. These functional groups can react with the active groups in the waterborne polyurethane dispersion to form covalent bonds, thereby obtaining nano-modified waterborne polyurethane powder. When added to cement-based mortar, it can fill the micropores in the cement mortar and improve the density and strength of the mortar. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0028] An integrated application of a three-in-one cement-based mortar, wherein the three-in-one cement-based mortar, which meets the requirements of waterproofing, bonding and crack resistance, is used in waterproof beams, irregular water-retaining strips, cable tray repair, wall and floor tile laying.

[0029] In some embodiments of the present invention, when the three-in-one cement-based mortar is used for repairing waterproof inverted beams, irregularly shaped water-retaining strips, and cable trays, the three-in-one cement-based mortar is mixed with water at a mass ratio of 100:(12-14). Specifically, the mass ratio of the three-in-one cement-based mortar to water is preferably 100:12, 100:13, or 100:14, but is not limited thereto.

[0030] In some embodiments of the present invention, when the three-in-one cement-based mortar is used for wall or floor tile laying, the three-in-one cement-based mortar and water are mixed in a mass ratio of 100:(14-22). Specifically, the mass ratio of the three-in-one cement-based mortar to water is preferably 100:14, 100:15, 100:16, 100:17, 100:18, 100:19, 100:20, 100:21, or 100:22, but is not limited thereto.

[0031] In some embodiments of the present invention, the conditions for mixing the three-in-one cement-based mortar with water are as follows: first, stir slowly for 120 seconds, then let stand for 60 seconds, then stir quickly for 120 seconds, and let stand for 5-15 minutes before use.

[0032] In some embodiments of the present invention, the construction process of the three-in-one cement-based mortar for waterproof beams, irregular water-blocking strips, cable trough repair, and wall or floor tile laying includes base cleaning, positioning operation, grouting operation, troweling and pressing pretreatment, post-treatment, and finished product protection.

[0033] In some embodiments of the present invention, the base cleaning includes using an industrial vacuum cleaner to clean the dust from the ground, cable trays, walls, and tiles. In the process of laying wall tiles, it also includes drilling holes in the tiles, and setting holes of appropriate size and shape on the tiles according to actual needs.

[0034] In some embodiments of the present invention, the positioning operations include line layout, rebar installation, formwork erection, surface wetting, and grouting operations in the application of waterproof inverted beams and irregular water-blocking strips; masking tape application in the process of line groove repair; and tile layout and control line setting operations in the application of wall or floor tile laying.

[0035] In some embodiments of the present invention, the slurry application operation includes pouring and vibration; when applied to wall tile installation, it also includes slurry application to the wall and the back of the tile, slurry preparation, and tile installation.

[0036] In some embodiments of the present invention, the troweling and pressing pretreatment includes troweling and smoothing after the mortar has initially set. When applying troweling and pressing pretreatment to wall or floor tiles, it also includes a kneading process, during which verticality and flatness are checked.

[0037] In some embodiments of the present invention, the post-processing includes demolding; in the application of irregularly shaped water-blocking strips, it also includes corner treatment and roughening treatment; when applying it for repairing wire grooves, pay attention to removing masking tape; when applying it for tiling walls, pay attention to leaving gaps with cross-shaped locators.

[0038] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims of the present invention.

[0039] In the following examples and comparative examples, the ordinary silicate cement is P.O42.5 cement; the mineral admixture is UHPC high-activity admixture HDC-V; the water-reducing agent is a polycarboxylate-based high-performance water-reducing agent; the water-retaining and thickening material is methyl hydroxyethyl cellulose ether Tylose MH60001P6; the recycled fine aggregate is a mixture of recycled concrete and recycled mortar in a mass ratio of 1:1, and the average particle size of the recycled fine aggregate is 4.20 mm; the microwave bone powder is bone powder obtained by microwave treatment at a power of 600 W for 5 min; the recycled powder is prepared by mixing recycled concrete powder and recycled mortar construction waste powder in a mass ratio of 1:1, and its fineness modulus is 400 mesh.

[0040] Unless otherwise specified, all raw materials are commercially available, and all conditions are standard conditions in the field.

[0041] Example 1

[0042] A method for preparing nano-modified waterborne polyurethane powder includes the following steps:

[0043] (1) Add dopamine hydrochloride to Tris-HCl buffer solution with pH 8.5. The mass ratio of dopamine hydrochloride to Tris-HCl buffer solution is 2:300 to obtain dopamine solution. Mix tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:20:5. Then add 25wt% ammonia water to adjust the pH of the solution to 8. Stir the reaction at room temperature and 200rpm for 3h. After the reaction is completed, add the above dopamine solution. Control the amount of dopamine hydrochloride added to be 0.3 times the mass of tetraethyl orthosilicate. Perform ultrasonic dispersion treatment at 200W for 2.5h. Then centrifuge. After centrifugation and drying of the precipitate, modified silica is obtained.

[0044] (2) The dehydrated isophorone diisocyanate and polyethylene glycol 400 were added to the reactor and stirred to control the NCO / OH ratio at 1.5. Then, 3% of the mass of polyethylene glycol 400 platinum catalyst and 20% of the mass of isophorone diisocyanate 2,2-dimethylolpropionic acid were added. The reaction was carried out at 65°C for 4 hours. When the viscosity increased during the reaction, N-methylpyrrolidone was added to adjust the viscosity of the reaction system to below 600 mPa·s. After the reaction was completed, the temperature was lowered to 50°C and a concentration of [missing information] was added. A 12wt% triethylamine solution was prepared, with the amount of triethylamine added controlled at 40wt% of the mass of polyethylene glycol 400. The reaction was continued for 0.5h, followed by the slow addition of 10% KH792 (by mass of polyethylene glycol 400), and the reaction was continued for 1h. After the reaction was completed, the reaction solution was cooled to room temperature to obtain an aqueous polyurethane emulsion. Modified silica was added to the above aqueous polyurethane emulsion, with the modified silica controlled at 1% of the solid mass in the aqueous polyurethane emulsion. The mixture was then dried to obtain modified aqueous polyurethane powder.

[0045] Example 2

[0046] A method for preparing nano-modified waterborne polyurethane powder includes the following steps:

[0047] (1) Add dopamine hydrochloride to Tris-HCl buffer solution with pH 8.5. The mass ratio of dopamine hydrochloride to Tris-HCl buffer solution is 3:200 to obtain dopamine solution. Mix tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:25:6. Then add 25wt% ammonia water to adjust the pH of the solution to 8. Stir the reaction at room temperature and 300rpm for 3h. After the reaction is completed, add the above dopamine solution. Control the amount of dopamine hydrochloride added to be 0.4 times the mass of tetraethyl orthosilicate. Perform ultrasonic dispersion treatment at 250W for 2h. Then centrifuge. After centrifugation and drying of the precipitate, modified silica is obtained.

[0048] (2) The dehydrated isophorone diisocyanate and polyethylene glycol 400 were added to the reactor and stirred to control the NCO / OH ratio at 1.5. Then, 6% of the mass of polyethylene glycol 400 platinum catalyst and 25% of the mass of isophorone diisocyanate 2,2-dimethylolpropionic acid were added. The reaction was carried out at 65°C for 4.5 h. When the viscosity increased during the reaction, N-methylpyrrolidone was added to adjust the viscosity of the reaction system to below 600 mPa·s. After the reaction was completed, the temperature was lowered to 55°C and concentrated... A 10 wt% triethylamine solution was prepared, with the amount of triethylamine added controlled at 45 wt% of the mass of polyethylene glycol 400. The reaction was continued for 1 hour, followed by the slow addition of 20% KH792 (by mass of polyethylene glycol 400), and the reaction was continued for 1.5 hours. After the reaction was completed, the reaction solution was cooled to room temperature to obtain an aqueous polyurethane emulsion. Modified silica was added to the above aqueous polyurethane emulsion, with the modified silica controlled at 1% of the solid mass in the aqueous polyurethane emulsion. The mixture was then dried to obtain modified aqueous polyurethane powder.

[0049] Example 3

[0050] A method for preparing nano-modified waterborne polyurethane powder includes the following steps:

[0051] (1) Add dopamine hydrochloride to Tris-HCl buffer solution with pH 8.5. The mass ratio of dopamine hydrochloride to Tris-HCl buffer solution is 3:280 to obtain dopamine solution. Mix tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:22:6. Then add 25wt% ammonia water to adjust the pH of the solution to 8. Stir the reaction at room temperature and 400rpm for 3h. After the reaction is completed, add the above dopamine solution. Control the amount of dopamine hydrochloride added to be 0.5 times the mass of tetraethyl orthosilicate. Perform ultrasonic dispersion treatment at 300W for 2.5h. Then centrifuge. After centrifugation and drying of the precipitate, modified silica is obtained.

[0052] (2) The dehydrated isophorone diisocyanate and polyethylene glycol 400 were added to the reactor and stirred to control the NCO / OH ratio at 1.5. Then, 8% of the mass of polyethylene glycol 400 platinum catalyst and 25% of the mass of isophorone diisocyanate 2,2-dimethylolpropionic acid were added. The reaction was carried out at 65°C for 5 hours. When the viscosity increased during the reaction, N-methylpyrrolidone was added to adjust the viscosity of the reaction system to below 600 mPa·s. After the reaction was completed, the temperature was lowered to 50°C and a concentration of [missing information] was added. A 15 wt% triethylamine solution was prepared, with the amount of triethylamine added controlled at 45 wt% of the mass of polyethylene glycol 400. The reaction was continued for 1 hour, followed by the slow addition of 45% KH792 (based on the mass of polyethylene glycol 400), and the reaction was continued for 1.5 hours. After the reaction was completed, the reaction solution was cooled to room temperature to obtain an aqueous polyurethane emulsion. Modified silica was then added to the above aqueous polyurethane emulsion, with the modified silica controlled at 1% of the solid mass in the aqueous polyurethane emulsion. After drying, modified aqueous polyurethane powder was obtained.

[0053] Comparative Example 1

[0054] Compared with Example 3, the difference is that no modified silica is added, while the other conditions are the same as in Example 3.

[0055] Comparative Example 2

[0056] Compared with Example 3, the difference is that dopamine solution is not added in the preparation of silica, while other conditions are the same as in Example 3.

[0057] Example 4

[0058] A method for preparing a three-in-one cement-based mortar, characterized by comprising the following steps:

[0059] S1: By weight, 50 parts of ordinary silicate cement, 45 parts of recycled aggregate, 8 parts of mineral admixture, and 1.5 parts of nano-modified waterborne polyurethane powder from Example 1 are added to mixing bin one in sequence according to the proportion, and mixed for 50 seconds to obtain material A.

[0060] S2: Add 2 parts microwave bone powder, 8 parts recycled powder, 5 parts VAE latex powder, 1 part water-retaining thickening material and 1 part water-reducing agent to mixing bin two according to the ratio, and perform primary mixing for 100 seconds to obtain material B;

[0061] S3: Add the above-mentioned A and B materials to mixing bin three and perform secondary mixing for 200 seconds to obtain three-in-one cement-based mortar.

[0062] Example 5

[0063] A method for preparing a three-in-one cement-based mortar, characterized by comprising the following steps:

[0064] S1: By weight, 50 parts of ordinary silicate cement, 50 parts of recycled aggregate, 8 parts of mineral admixture, and 2.5 parts of nano-modified waterborne polyurethane powder from Example 1 are added to mixing bin one in sequence according to the proportion, and mixed for 50 seconds to obtain material A.

[0065] S2: Add 3 parts microwave bone powder, 10 parts recycled powder, 12 parts VAE latex powder, 1.5 parts water-retaining thickening material and 2 parts water-reducing agent to mixing bin two according to the ratio, and perform primary mixing for 100 seconds to obtain material B;

[0066] S3: Add the above-mentioned A and B materials to mixing bin three and perform secondary mixing for 200 seconds to obtain three-in-one cement-based mortar.

[0067] Example 6

[0068] A method for preparing a three-in-one cement-based mortar, characterized by comprising the following steps:

[0069] S1: By weight, 50 parts of ordinary silicate cement, 53 parts of recycled aggregate, 8 parts of mineral admixture, and 2 parts of nano-modified waterborne polyurethane powder from Example 2 are added to mixing bin one in sequence according to the proportion, and mixed for 40 seconds to obtain material A.

[0070] S2: Add 4 parts microwave bone powder, 11 parts recycled powder, 8 parts VAE latex powder, 1 part water-retaining thickening material and 1.5 parts water-reducing agent to mixing bin two according to the ratio, and perform primary mixing for 80 seconds to obtain material B;

[0071] S3: Add the above-mentioned A and B materials to mixing bin three and perform secondary mixing for 220 seconds to obtain three-in-one cement-based mortar.

[0072] Example 7

[0073] A method for preparing a three-in-one cement-based mortar, characterized by comprising the following steps:

[0074] S1: By weight, 55 parts of ordinary silicate cement, 60 parts of recycled aggregate, 10 parts of mineral admixture, and 2.2 parts of nano-modified waterborne polyurethane powder from Example 3 are added to mixing bin one in sequence according to the proportion, and mixed for 50 seconds to obtain material A.

[0075] S2: Add 4 parts microwave bone powder, 12 parts recycled powder, 10 parts VAE latex powder, 1.5 parts water-retaining thickening material and 2 parts water-reducing agent to mixing bin two according to the ratio, and perform primary mixing for 80 seconds to obtain material B;

[0076] S3: Add the above-mentioned A and B materials to mixing bin three and perform secondary mixing for 200 seconds to obtain three-in-one cement-based mortar.

[0077] To verify the effectiveness of the present invention, a detailed description is provided below with reference to Example 7 and several comparative examples.

[0078] Comparative Example 3

[0079] Compared with Example 7, the difference is that the components are directly mixed without multi-stage mixing, while other conditions are the same as in Example 7.

[0080] Comparative Example 4

[0081] Compared with Example 7, the difference is that an equal amount of waterborne polyurethane powder prepared in Comparative Example 1 is used to replace the nano-modified waterborne polyurethane powder in Example 7, while other conditions are the same as in Example 7.

[0082] Comparative Example 5

[0083] Compared with Example 7, the difference is that an equal amount of nano-modified waterborne polyurethane powder prepared in Comparative Example 2 was used to replace the nano-modified waterborne polyurethane powder in Example 7, while other conditions were the same as in Example 7.

[0084] Comparative Example 6

[0085] Compared with Example 7, the difference is that no nano-modified waterborne polyurethane powder is added, while the other conditions are the same as in Example 7.

[0086] Application Examples

[0087] The three-in-one cement-based mortars prepared in Examples 4-7 and Comparative Examples 3-6 were mixed with water at a mass ratio of 100:14 to prepare slurries.

[0088] The properties of the above-mentioned slurry were tested, and the test standards and results are as follows:

[0089] 1. Tensile bond strength: The test was conducted in accordance with JGJ / T70-2009 "Test Methods for Basic Performance of Building Mortar", using a concrete slab as the substrate, and the original tensile bond strength was tested after 3 days.

[0090] 2. Compression-to-flexural ratio: The 28-day compressive strength and flexural strength were tested according to the JC / T 1004-2017 standard "Ceramic Tile Grout", and the compression-to-flexural ratio was calculated.

[0091] 3. Impermeability: The impermeability test mold was used to conduct the test according to GB23440-2009 Inorganic Waterproof and Leak-stopping Materials, and the permeability was observed and recorded.

[0092] 4. Shrinkage rate: The shrinkage rate was tested according to JGJ / T70-2009 "Test Method for Basic Performance of Building Mortar" and measured at 28 days using a vertical length comparator.

[0093] The test results are shown in Table 1.

[0094] Table 1

[0095]

[0096]

[0097] As can be seen from the test results in Table 1, compared with the comparative example, the present invention combines ordinary silicate cement, recycled aggregate, microwave bone powder, mineral admixtures, recycled powder, VAE latex powder, water-retaining thickening material, water-reducing agent, and nano-modified waterborne polyurethane powder in a certain proportion. Furthermore, the raw materials are mixed in separate compartments during mixing, and a multi-stage mixing method is adopted to ensure that the components are fully and evenly mixed. The resulting cement-based mortar has a three-in-one function of waterproofing, crack resistance, and adhesion, and can be integrated into various applications such as waterproof beams, irregular water-blocking strips, cable tray repair, and wall and floor tile laying.

[0098] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. An integrated application of a three-in-one cement-based mortar, characterized in that: The three-in-one cement-based mortar, which meets the requirements of waterproofing, bonding and crack resistance, is used in waterproof beams, irregular water-blocking strips, cable tray repair, wall and floor tile laying; A method for preparing a three-in-one cement-based mortar includes the following steps: S1: Ordinary silicate cement, recycled aggregate, mineral admixture, and nano-modified waterborne polyurethane powder are added to mixing bin one in sequence according to the proportion, and primary mixing is carried out to obtain material A; S2: Microwave bone powder, regenerated powder, VAE latex powder, water-retaining thickening material and water-reducing agent are added to mixing bin two according to the ratio and mixed in the first stage to obtain material B; the microwave power during the preparation of microwave bone powder is 550-700W and the time is 3-6min. S3: Add the above-mentioned A and B materials to the mixing bin three for secondary mixing to obtain three-in-one cement-based mortar; The preparation method of the nano-modified waterborne polyurethane powder includes the following steps: (1) Add dopamine hydrochloride to Tris-HCl buffer solution with pH 8.

5. The mass ratio of dopamine hydrochloride to Tris-HCl buffer solution is 1-4:200-400 to obtain dopamine solution. Mix tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:20-25:5-6. Then add 25wt% ammonia water to adjust the pH of the solution to 8. Stir the reaction at room temperature and 200-500rpm for 2-3h. After the reaction is completed, add the above dopamine solution. Control the amount of dopamine hydrochloride added to be 0.3-0.5 times the mass of tetraethyl orthosilicate. Perform ultrasonic dispersion treatment at 200-300W for 1.5-2.5h. Then centrifuge. After centrifugation and drying of the precipitate, modified silica is obtained. (2) The dehydrated isophorone diisocyanate and polyethylene glycol 400 were added to the reactor and stirred to control the NCO / OH ratio at 1.

5. Then, 1-10% of the mass of polyethylene glycol 400 platinum catalyst and 20-30% of the mass of isophorone diisocyanate 2,2-dimethylolpropionic acid were added. The reaction was carried out at 60-70℃ for 3-5 hours. When the viscosity increased during the reaction, N-methylpyrrolidone was added to adjust the viscosity of the reaction system to below 600 mPa·s. After the reaction was completed, the temperature was lowered to 50-60℃, and a 10% concentration of N-methylpyrrolidone was added. A 15wt% triethylamine solution was prepared, with the amount of triethylamine added controlled at 40-45wt% of the mass of polyethylene glycol 400. The reaction was continued for 0.5-1h. Then, 1-50% of the mass of polyethylene glycol 400 KH792 was slowly added, and the reaction was continued for 1-1.5h. After the reaction was completed, the reaction solution was cooled to room temperature to obtain an aqueous polyurethane emulsion. Modified silica was added to the above aqueous polyurethane emulsion, with the amount of modified silica controlled at 0.5-1.5% of the solid mass in the aqueous polyurethane emulsion. After drying, modified aqueous polyurethane powder was obtained.

2. The integrated application of a three-in-one cement-based mortar according to claim 1, characterized in that, When the three-in-one cement-based mortar is used for waterproof inverted beams, irregular water-blocking strips, and cable trough repairs, the three-in-one cement-based mortar is mixed with water at a mass ratio of 100:(12-14).

3. The integrated application of a three-in-one cement-based mortar according to claim 1, characterized in that, When the three-in-one cement-based mortar is used for wall or floor tile laying, it is mixed with water at a mass ratio of 100:(14-22).

4. The integrated application of a three-in-one cement-based mortar according to claim 2 or 3, characterized in that, The conditions for mixing the three-in-one cement-based mortar with water are as follows: first, stir slowly for 120 seconds, then let it stand for 60 seconds, then stir quickly for 120 seconds, and let it stand for 5-15 minutes before use.

5. The integrated application of a three-in-one cement-based mortar according to claim 1, characterized in that, The mixing time for material A preparation is ≥30s; the mixing time for material B preparation is ≥60s; and the time for secondary mixing is ≥180s.

6. The integrated application of a three-in-one cement-based mortar according to claim 1, characterized in that, The amounts of each component in the three-in-one cement-based mortar, by weight, are as follows: 15-55 parts ordinary silicate cement, 45-60 parts recycled aggregate, 1-5 parts microwave bone powder, 8-10 parts mineral admixture, 1-2 parts nano-modified waterborne polyurethane powder, 5-15 parts recycled powder, 2-20 parts VAE latex powder, 0.5-2 parts water-retaining and thickening material, and 1-3 parts water-reducing agent.

7. The integrated application of a three-in-one cement-based mortar according to claim 6, characterized in that, The recycled aggregate is recycled fine aggregate for concrete and mortar, with an average particle size of not more than 4.75 mm and not less than 0.30 mm, and a fineness modulus of 2.5-3.2; and / or the recycled powder includes concrete and mortar construction waste powder, with a fineness modulus of 325-500 mesh.

Images