Preparation method and integrated application of three-in-one cement-based mortar

Abstract

The invention relates to the technical field of building materials, and provides a preparation method and integrated application of three-in-one cement-based mortar, and the three-in-one cement-based mortar has waterproof, bonding and anti-cracking performance requirements. The integrated application of the mortar mainly relates to repairing of waterproof reversed beams, special-shaped water retaining strips and wire grooves and paving of wall surfaces and floor tiles, and the mortar is more practical and convenient to construct. The invention further discloses a formula and a preparation method of the three-in-one cement-based mortar, the mortar is endowed with good grading and surface performance through combined application of the recycled aggregate, the microwave bone meal and the recycled powder, silicon dioxide is subjected to in-situ modification by adopting polydopamine, the surface of the obtained modified silicon dioxide has rich amino and hydroxyl functional groups, and the surface of the modified silicon dioxide has good comprehensive performance. After the nano-modified waterborne polyurethane powder is added into cement-based mortar, micro pores in the cement mortar can be filled, the density and the strength of the mortar are improved, and the cracking risk of the mortar is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a preparation method of a three-in-one cement-based mortar and its integrated application. Background Art

[0002] Mortar is a building material with large consumption and wide application in construction projects. It is made of cementitious materials, fine aggregates, water and admixtures or additives added to achieve certain functions, prepared in a certain proportion. It plays the role of bonding, cushioning, protection and stress transfer in construction projects. According to the purpose, mortar is mainly divided into masonry mortar, plastering mortar, floor mortar, facing mortar, decorative mortar, as well as special mortars such as waterproof mortar, anti-corrosion mortar, thermal insulation mortar, repair mortar and radiation protection mortar. According to the cementitious materials used, it can be divided into lime mortar, cement mortar, cement mixed mortar, polymer cement mortar, etc. According to the preparation process, it can be divided into on-site mixing mortar, factory premixed mortar, etc. According to whether water is added on-site for mixing, it can be divided into dry-mixed mortar and wet-mixed mortar. At present, 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, but is pre-mixed in the factory into products for various purposes, that is, dry mortar or dry-mixed mortar, which enter the construction site and have developed into a series of products.

[0003] From the perspective of materials science, before applying the surface material on the wall, it is often necessary to apply the interface layer, waterproof layer, and leveling layer. The composition of these materials is similar, but the performance varies greatly. Floor paving also encounters the same problem. Before laying tiles or wooden floors, whether it is the construction of leveling mortar, waterproof mortar, or interface mortar, the differences in material composition and performance have invisibly added multiple material transition layers - interface transition zones. Affected by the differences in performance of different mortars or the influence of construction technology, this interface transition zone often becomes a weak link in material damage. At different interfaces, cracking, shedding, peeling, etc. may occur. Therefore, how to develop a multifunctional mortar that can simultaneously meet the requirements of multiple functions such as waterproofing, bonding, and crack resistance has become the focus of research. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a preparation method of a three-in-one cement-based mortar and its integrated application are provided. The cement mortar prepared by the present invention has the three-in-one functions of waterproofing, crack resistance and bonding, and can be used simultaneously in waterproof inverted beams, special-shaped water retaining strips, cable trough repairs, and wall and floor tile paving. It is more practical and convenient to construct.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] The invention discloses an integrated application of a three-in-one cement-based mortar. The three-in-one cement-based mortar is used as a three-in-one mortar with waterproof, bonding and crack resistance performance requirements for waterproof inverted beams, special-shaped water retaining strips, wire trough repairs, and wall and floor tile paving.

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

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

[0009] Preferably, the three-in-one cement-based mortar is mixed with water under the following conditions: first slowly stir for 120 seconds, then let stand for 60 seconds, then quickly stir for 120 seconds, let stand for 5-15 minutes, and then it can be used.

[0010] In order to better solve the above technical problems, the present invention also discloses the following technical solutions:

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

[0012] S1: ordinary Portland cement, recycled aggregate, mineral admixture, and nano-modified waterborne polyurethane powder are added to a mixing bin 1 in order according to the proportions, and mixed in one stage to obtain material A;

[0013] S2: adding microwave bone meal, recycled powder, VAE latex powder, water-retaining thickening material and water reducing agent into mixing bin 2 according to the proportion, and performing primary mixing to obtain material B;

[0014] S3: Add the above-mentioned material A and material B into 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 ≥30 s; the mixing time during the preparation of material B is ≥60 s; and the time during the secondary mixing is ≥180 s.

[0016] Preferably, the amount of each component in the three-in-one cement-based mortar, in parts by weight, is specifically:

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

[0018] Preferably, the recycled aggregate is recycled fine aggregate for concrete and mortar, the average particle size of the recycled aggregate is not more 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 bone powder is 550-700 W, and the time is 3-6 min; and / or the recycled powder includes concrete, mortar and construction waste powder, and its fineness modulus is 325-500 mesh.

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

[0020] (1) adding dopamine hydrochloride to a Tris-HCl buffer solution having a pH of 8.5, wherein the mass ratio of dopamine hydrochloride to the Tris-HCl buffer solution is 1-4:200-400, to obtain a dopamine solution; mixing tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:20-25:5-6, and then adding ammonia water having a concentration of 25 wt % to adjust the solution to a pH of 8, stirring the solution at room temperature and 200-500 rpm for 2-3 hours, adding the above dopamine solution after the reaction is completed, controlling the amount of dopamine added to be 0.3-0.5 times the mass of tetraethyl orthosilicate, performing ultrasonic dispersion treatment at 200-300 W for 1.5-2.5 hours, and then centrifuging. After the centrifugal precipitate is dried, modified silica is obtained;

[0021] (2) adding the dehydrated isophorone diisocyanate and polyethylene glycol 400 to a reactor and stirring and mixing, controlling the NCO / OH ratio to be 1.5, then adding 1-10% of the mass of the polyethylene glycol 400 platinum catalyst and 20-30% of the mass of the isophorone diisocyanate 2,2-dimethylol propionic acid, and reacting at 60-70° C. for 3-5 hours. When the viscosity increases during the reaction, adding N-methyl pyrrolidone to adjust the viscosity of the reaction system to less than 600 mPa·s. After the reaction is completed, cooling to 50-60° C., adding a 10 -15wt% triethylamine solution, control the amount of triethylamine added to 40-45wt% of the mass of polyethylene glycol 400, continue the reaction for 0.5-1h, then slowly add 1-50% of KH792 based on the mass of polyethylene glycol 400, continue the reaction for 1-1.5h, after the reaction is completed, cool the reaction solution to room temperature to obtain an aqueous polyurethane emulsion, add modified silica to the above aqueous polyurethane emulsion, control the modified silica to 0.5-1.5% of the solid mass in the aqueous polyurethane emulsion, and then dry to obtain a modified aqueous polyurethane powder.

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

[0023] (1) The present invention provides a three-in-one cement-based mortar, including ordinary Portland cement, recycled aggregate, microwave bone powder, mineral admixture, recycled powder, VAE latex powder, water-retaining thickener, water-reducing agent, and nano-modified waterborne polyurethane powder. The present invention optimizes the amount of each component, and mixes the raw materials in separate bins during mixing, and adopts a multi-stage mixing method to fully and evenly mix the components. The obtained cement-based mortar has the three-in-one functions of waterproofing, crack resistance, and bonding, and has multiple integrated applications such as waterproof reverse beams, special-shaped water retaining strips, wire trough repair, and wall and floor tile paving.

[0024] (2) In the three-in-one cement-based mortar provided by the present invention, cement is used as the main binder of the mortar, providing basic structural strength and bonding properties. Cement forms hydrates during the hydration reaction, and these hydrates increase the strength and rigidity of the mortar. The use of recycled aggregates composed of recycled concrete or recycled mortar aggregates can not only reduce resource waste, but also improve the workability and bonding properties of the mortar, while improving its crack resistance. Microwave bone powder can improve the rheology of the mortar and increase the compressive strength of the mortar. 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, while reducing the thermal expansion coefficient and 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 properties of the mortar. It helps to reduce shrinkage and further improve crack resistance.

[0025] (3) The nano-modified waterborne polyurethane powder added to the mortar of the present invention is firstly prepared by in-situ modification of silicon dioxide with polydopamine. The surface of the modified silicon dioxide obtained 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 the nano-modified waterborne polyurethane powder. The nano-modified waterborne polyurethane powder is added to the cement-based mortar to fill the microscopic pores in the cement mortar and improve the density and strength of the mortar. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] The invention discloses an integrated application of a three-in-one cement-based mortar. The three-in-one cement-based mortar is used as a three-in-one mortar with waterproof, bonding and crack resistance performance requirements for waterproof inverted beams, special-shaped water retaining strips, wire trough repairs, and wall and floor tile paving.

[0029] In some embodiments of the present invention, when the three-in-one cement-based mortar is used for waterproofing inverted beams, special-shaped water retaining strips, and repairing cable troughs, the three-in-one cement-based mortar and water are mixed in a mass ratio of 100:(12-14). Specifically, the mass ratio of the three-in-one cement-based mortar to water may preferably be 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 paving wall or floor tiles, 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 may preferably be 100:14, 100:15, 100:16, 100:17, 100:18, 100:19, 100:20, 100:21, 100:22, but is not limited thereto.

[0031] In some embodiments of the present invention, the three-in-one cement-based mortar is mixed with water under the following conditions: first, stir slowly for 120 seconds, then let stand for 60 seconds, then stir quickly for 120 seconds, let stand for 5-15 minutes, and then it can be used.

[0032] In some embodiments of the present invention, the construction process of the three-in-one cement-based mortar when used for waterproof inverted beams, special-shaped water retaining strips, cable trough repairs, and wall or floor tile paving includes base cleaning, positioning operations, sizing operations, smearing 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 floor, cable troughs, walls, floors, and tiles. The wall tile paving process also includes drilling holes in the tiles, and setting holes of corresponding sizes and shapes on the tiles according to actual needs.

[0034] In some embodiments of the present invention, the positioning operations include line marking, reinforcement planting, formwork support, surface wetting, and slurry sweeping operations in the application of waterproof reverse beams and special-shaped water retaining strips, masking tape laying during the application of line groove repairs, and brick laying and control line setting operations when laying tiles on walls or floors.

[0035] In some embodiments of the present invention, the slurry application operation includes pouring and vibrating; when the wall tiles are laid, the application also includes slurry application on the wall and the back of the tiles, slurry combing, and tile laying operations.

[0036] In some embodiments of the present invention, the smearing and pressing pretreatment includes a smearing and polishing treatment after the initial setting of the mortar. The smearing and pressing pretreatment during the application of wall or floor tile paving also includes a kneading process, during which the verticality and flatness are checked.

[0037] In some embodiments of the present invention, the post-processing includes demolding, and the application of special-shaped water retaining strips also includes processing of Yin-Yang corners and roughening. When repairing wire troughs, attention should be paid to removing masking tape, and when paving walls, attention should be paid to leaving gaps using a cross locator.

[0038] In order 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, rather than limiting the claims of the present invention.

[0039] In the following embodiments and comparative examples, the ordinary Portland cement is P.O42.5 cement; the mineral admixture is UHPC high-activity admixture HDC-V; the water reducer is a polycarboxylic acid-based high-performance water reducer; the water-retaining 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 treating at a microwave power of 600 W for 5 minutes; the recycled powder is obtained 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, the raw materials are commercially available and the conditions are conventional conditions in the art.

[0041] Example 1

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

[0043] (1) adding dopamine hydrochloride to a Tris-HCl buffer solution having a pH of 8.5, wherein the mass ratio of dopamine hydrochloride to the Tris-HCl buffer solution is 2:300, to obtain a dopamine solution; mixing tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:20:5, and then adding ammonia water having a concentration of 25 wt% to adjust the solution to a pH of 8, stirring and reacting the solution at room temperature and 200 rpm for 3 h, adding the above dopamine solution after the reaction is completed, controlling the addition amount of dopamine hydrochloride to be 0.3 times the mass of tetraethyl orthosilicate, performing ultrasonic dispersion treatment at 200 W for 2.5 h, and then centrifuging, and drying the centrifugal precipitate to obtain modified silica;

[0044] (2) The dehydrated isophorone diisocyanate and polyethylene glycol 400 were added to the reactor and stirred to mix, and the NCO / OH ratio was controlled to be 1.5. Then, 3% of the mass of the polyethylene glycol 400 platinum catalyst and 20% of the mass of the isophorone diisocyanate 2,2-dimethylol propionic acid were added, and 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 less than 600 mPa·s. After the reaction was completed, the temperature was lowered to 50° C., and a concentration of 1.5% was added. The invention discloses a 12wt% triethylamine solution, wherein the amount of triethylamine added is controlled to be 40wt% of the mass of polyethylene glycol 400, and the reaction is continued for 0.5h. Then, 10% of KH792 by mass of polyethylene glycol 400 is slowly added, and the reaction is continued for 1h. After the reaction is completed, the reaction solution is cooled to room temperature to obtain an aqueous polyurethane emulsion, and modified silica is added to the aqueous polyurethane emulsion, wherein the modified silica is controlled to be 1% of the solid mass in the aqueous polyurethane emulsion, and then dried to obtain a modified aqueous polyurethane powder.

[0045] Example 2

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

[0047] (1) adding dopamine hydrochloride to a Tris-HCl buffer solution having a pH of 8.5, wherein the mass ratio of dopamine hydrochloride to the Tris-HCl buffer solution is 3:200, to obtain a dopamine solution; mixing tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:25:6, and then adding ammonia water having a concentration of 25 wt % to adjust the solution to a pH of 8, stirring and reacting at room temperature and 300 rpm for 3 h, adding the above dopamine solution after the reaction is completed, controlling the addition amount of dopamine hydrochloride to be 0.4 times the mass of tetraethyl orthosilicate, performing ultrasonic dispersion treatment at 250 W for 2 h, and then centrifuging, and drying the centrifugal precipitate to obtain modified silica;

[0048] (2) adding the dehydrated isophorone diisocyanate and polyethylene glycol 400 into a reactor and stirring and mixing, controlling the NCO / OH ratio to be 1.5, then adding 6% of the mass of the polyethylene glycol 400 platinum catalyst and 25% of the mass of the isophorone diisocyanate 2,2-dimethylol propionic acid, and reacting at 65° C. for 4.5 hours. When the viscosity increases during the reaction, adding N-methylpyrrolidone to adjust the viscosity of the reaction system to less than 600 mPa·s. After the reaction is completed, cooling to 55° C., adding concentrated A 10wt% triethylamine solution was added, and the amount of triethylamine added was controlled to be 45wt% of the mass of polyethylene glycol 400. The reaction was continued for 1h, and then 20% of KH792 by mass of polyethylene glycol 400 was slowly added, and the reaction was continued for 1.5h. After the reaction was completed, the reaction solution was cooled to room temperature to obtain an aqueous polyurethane emulsion, and modified silica was added to the above aqueous polyurethane emulsion, and the modified silica was controlled to be 1% of the solid mass in the aqueous polyurethane emulsion. Then, the modified aqueous polyurethane powder was obtained by drying.

[0049] Example 3

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

[0051] (1) adding dopamine hydrochloride to a Tris-HCl buffer solution having a pH of 8.5, wherein the mass ratio of dopamine hydrochloride to the Tris-HCl buffer solution is 3:280, to obtain a dopamine solution; mixing tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:22:6, and then adding ammonia water having a concentration of 25 wt% to adjust the solution to a pH of 8, stirring and reacting at room temperature and 400 rpm for 3 h, adding the above dopamine solution after the reaction is completed, controlling the addition amount of dopamine hydrochloride to be 0.5 times the mass of tetraethyl orthosilicate, performing ultrasonic dispersion treatment at 300 W for 2.5 h, and then centrifuging, and drying the centrifugal precipitate to obtain modified silica;

[0052] (2) The dehydrated isophorone diisocyanate and polyethylene glycol 400 were added to the reactor and stirred to mix, and the NCO / OH ratio was controlled to be 1.5. Then, 8% of the mass of the polyethylene glycol 400 platinum catalyst and 25% of the mass of the isophorone diisocyanate 2,2-dimethylol propionic acid were added, and 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 less than 600 mPa·s. After the reaction was completed, the temperature was lowered to 50° C., and a concentration of The invention discloses a 15wt% triethylamine solution, wherein the amount of triethylamine added is controlled to be 45wt% of the mass of polyethylene glycol 400, and the reaction is continued for 1h. Then, 45% of the mass of polyethylene glycol 400 KH792 is slowly added, and the reaction is continued for 1.5h. After the reaction is completed, the reaction solution is cooled to room temperature to obtain an aqueous polyurethane emulsion, and modified silica is added to the above aqueous polyurethane emulsion, and the modified silica is controlled to be 1% of the solid mass in the aqueous polyurethane emulsion. Then, the modified aqueous polyurethane powder is obtained by drying.

[0053] Comparative Example 1

[0054] Compared with Example 3, the difference is that modified silicon dioxide is not added, and other conditions are the same as Example 3.

[0055] Comparative Example 2

[0056] Compared with Example 3, the difference is that no dopamine solution is added in the preparation of silicon dioxide, and other conditions are the same as those in Example 3.

[0057] Example 4

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

[0059] S1: In parts by weight, 50 parts of ordinary Portland cement, 45 parts of recycled aggregate, 8 parts of mineral admixture, and 1.5 parts of the nano-modified waterborne polyurethane powder of Example 1 are added to a mixing bin 1 in order according to the proportions, and primary mixing is performed for 50 seconds to obtain material A;

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

[0061] S3: Add the above-mentioned material A and material B into the mixing bin 3, and perform secondary mixing for 200 seconds to obtain a three-in-one cement-based mortar.

[0062] Example 5

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

[0064] S1: In parts by weight, 50 parts of ordinary Portland cement, 50 parts of recycled aggregate, 8 parts of mineral admixture, and 2.5 parts of the nano-modified waterborne polyurethane powder of Example 1 are added to a mixing bin 1 in order according to the proportions, and primary mixing is performed for 50 seconds to obtain material A;

[0065] S2: Add 3 parts of microwave bone meal, 10 parts of recycled powder, 12 parts of VAE latex powder, 1.5 parts of water-retaining thickener and 2 parts of water reducer into mixing bin 2 according to the proportion, and perform primary mixing for 100 seconds to obtain material B;

[0066] S3: Add the above-mentioned material A and material B into the mixing bin 3, and perform secondary mixing for 200 seconds to obtain a three-in-one cement-based mortar.

[0067] Example 6

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

[0069] S1: In parts by weight, 50 parts of ordinary Portland cement, 53 parts of recycled aggregate, 8 parts of mineral admixture, and 2 parts of the nano-modified waterborne polyurethane powder of Example 2 are added to a mixing bin 1 in order according to the proportions, and primary mixing is performed for 40 seconds to obtain material A;

[0070] S2: Add 4 parts of microwave bone meal, 11 parts of recycled powder, 8 parts of VAE latex powder, 1 part of water-retaining thickener and 1.5 parts of water-reducing agent into mixing bin 2 according to the proportion, and perform primary mixing for 80 seconds to obtain material B;

[0071] S3: Add the above-mentioned material A and material B into the mixing bin 3, and perform secondary mixing for 220 seconds to obtain a three-in-one cement-based mortar.

[0072] Example 7

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

[0074] S1: In parts by weight, 55 parts of ordinary Portland cement, 60 parts of recycled aggregate, 10 parts of mineral admixture, and 2.2 parts of the nano-modified waterborne polyurethane powder of Example 3 are added to a mixing bin 1 in accordance with the proportions, and primary mixing is performed for 50 seconds to obtain material A;

[0075] S2: Add 4 parts of microwave bone meal, 12 parts of recycled powder, 10 parts of VAE latex powder, 1.5 parts of water-retaining thickener and 2 parts of water reducer into mixing bin 2 according to the proportion, and perform primary mixing for 80 seconds to obtain material B;

[0076] S3: Add the above-mentioned material A and material B into the mixing bin 3, and perform secondary mixing for 200 seconds to obtain a three-in-one cement-based mortar.

[0077] In order to verify the effect of the present invention, the following is a detailed description with reference to Example 7 and combined with a plurality of comparative examples.

[0078] Comparative Example 3

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

[0080] Comparative Example 4

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

[0082] Comparative Example 5

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

[0084] Comparative Example 6

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

[0086] Application Examples

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

[0088] The performance of the above slurry was tested, and the test standards and test results are as follows:

[0089] 1. Tensile bond strength: Tested in accordance with JGJ / T70-2009 "Test Method for Basic Performance of Building Mortar", with concrete slab as the base, and tested for 3d tensile bond strength.

[0090] 2. Compression-flexure ratio: According to the standard JC / T 1004-2017 "Ceramic Tile Sealant", the 28d compressive strength and flexural strength are tested, and the compression-flexure ratio is calculated.

[0091] 3. Anti-seepage performance: Use an anti-seepage test mold and test it in accordance with GB23440-2009 inorganic waterproof plugging materials, and observe and record its penetration conditions.

[0092] 4. Shrinkage rate: Test in accordance with JGJ / T70-2009 "Basic performance test method for building mortar", and use a vertical comparator to test the shrinkage rate of 28 days.

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

[0094] Table 1

[0095]

[0096]

[0097] It can be seen from the test results in Table 1 that compared with the comparative example, the present invention compounds ordinary Portland cement, recycled aggregate, microwave bone meal, mineral admixture, recycled powder, VAE latex powder, water-retaining thickening material, water reducer, and nano-modified waterborne polyurethane powder according to a certain ratio, and mixes the raw materials in separate compartments during mixing, and adopts a multi-stage mixing method to make the component materials fully and evenly mixed. The obtained cement-based mortar has the three-in-one functions of waterproofing, crack resistance, and bonding, and has multiple integrated applications such as waterproof reverse beams, special-shaped water retaining strips, wire trough repairs, and wall and floor tile paving.

[0098] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in 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 is used as a three-in-one mortar that meets the requirements of waterproof, bonding and crack resistance and is used in waterproof inverted beams, special-shaped water retaining strips, wire trough repairs, and wall and floor tile paving.

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 repairing waterproof inverted beams, special-shaped water retaining strips, and wire troughs, the three-in-one cement-based mortar is mixed with water in 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 paving wall or floor tiles, the three-in-one cement-based mortar and water are mixed in 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 three-in-one cement-based mortar is mixed with water under the following conditions: firstly slowly stir for 120 seconds, then stand for 60 seconds, then quickly stir for 120 seconds, stand for 5-15 minutes, and then the mortar can be used.

5. The method for preparing a three-in-one cement-based mortar for integrated application according to claim 1, characterized in that: The following steps are involved: S1: ordinary Portland cement, recycled aggregate, mineral admixture, and nano-modified waterborne polyurethane powder are added to a mixing bin 1 in order according to the proportions, and mixed in one stage to obtain material A; S2: adding microwave bone meal, recycled powder, VAE latex powder, water-retaining thickening material and water reducing agent into mixing bin 2 according to the proportion, and performing primary mixing to obtain material B; S3: Add the above-mentioned material A and material B into the mixing bin three for secondary mixing to obtain a three-in-one cement-based mortar.

6. The method for preparing a three-in-one cement-based mortar according to claim 5, characterized in that: The mixing time for preparing material A is ≥30s; the mixing time for preparing material B is ≥60s; the time for secondary mixing is ≥180s.

7. The method for preparing a three-in-one cement-based mortar according to claim 5, characterized in that: The amount of each component in the three-in-one cement-based mortar, in parts by weight, is specifically: 15-55 parts of ordinary Portland cement, 45-60 parts of recycled aggregate, 1-5 parts of microwave bone powder, 8-10 parts of mineral admixture, 1-2 parts of nano-modified water-based polyurethane powder, 5-15 parts of recycled powder, 2-20 parts of VAE latex powder, 0.5-2 parts of water-retaining thickening material, and 1-3 parts of water reducer.

8. The method for preparing a three-in-one cement-based mortar according to claim 7, characterized in that: The recycled aggregate is recycled fine aggregate for concrete and mortar, the average particle size of the recycled aggregate is not more 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 bone powder is 550-700 W, and the time is 3-6 min; and / or the recycled powder includes concrete, mortar and construction waste powder, and its fineness modulus is 325-500 mesh.

9. The method for preparing a three-in-one cement-based mortar according to claim 9, characterized in that: The preparation method of the nano-modified waterborne polyurethane powder comprises the following steps: (1) adding dopamine hydrochloride to a Tris-HCl buffer solution having a pH of 8.5, wherein the mass ratio of dopamine hydrochloride to the Tris-HCl buffer solution is 1-4:200-400, to obtain a dopamine solution; mixing tetraethyl orthosilicate, ethanol and deionized water in a volume ratio of 2:20-25:5-6, then adding 25 wt% ammonia water to adjust the pH of the solution to 8, stirring and reacting at room temperature and a rotation speed of 200-500 rpm for 2-3 hours, adding the above dopamine solution after the reaction is completed, controlling the addition amount of dopamine hydrochloride to be 0.3-0.5 times the mass of tetraethyl orthosilicate, performing ultrasonic dispersion treatment at 200-300 W for 1.5-2.5 hours, then centrifuging, and drying the centrifugal precipitate to obtain modified silica; (2) adding the dehydrated isophorone diisocyanate and polyethylene glycol 400 to a reactor and stirring and mixing, controlling the NCO / OH ratio to be 1.5, then adding 1-10% of the mass of the polyethylene glycol 400 platinum catalyst and 20-30% of the mass of the isophorone diisocyanate 2,2-dimethylol propionic acid, and reacting at 60-70° C. for 3-5 hours. When the viscosity increases during the reaction, adding N-methyl pyrrolidone to adjust the viscosity of the reaction system to less than 600 mPa·s. After the reaction is completed, cooling to 50-60° C., adding a 10 -15wt% triethylamine solution, control the amount of triethylamine added to 40-45wt% of the mass of polyethylene glycol 400, continue the reaction for 0.5-1h, then slowly add 1-50% of KH792 based on the mass of polyethylene glycol 400, continue the reaction for 1-1.5h, after the reaction is completed, cool the reaction solution to room temperature to obtain an aqueous polyurethane emulsion, add modified silica to the above aqueous polyurethane emulsion, control the modified silica to 0.5-1.5% of the solid mass in the aqueous polyurethane emulsion, and then dry to obtain a modified aqueous polyurethane powder.

Images