High-performance waterproof dry-mixed mortar and preparation method thereof

Abstract

The invention relates to the technical field of mortar preparation, in particular to high-performance waterproof dry-mixed mortar and a preparation method thereof. The high-performance waterproof dry-mixed mortar is prepared from the following raw materials in parts by weight: 300 to 400 parts of cement, 550 to 650 parts of quartz sand, 1.5 to 3.0 parts of silane waterproof agent, 15 to 25 parts of hydrophobic redispersible latex powder, 0.2 to 0.5 part of water-retaining thickening agent, 0.5 to 1.5 parts of polycarboxylic acid water reducing agent, 3 to 8 parts of thixotropic lubricant, 0.3 to 1 part of coagulation accelerator, 20 to 50 parts of superfine filler and 0.5 to 1.5 parts of polypropylene fiber. The technical problem of non-uniform dispersion of trace components in high-performance mortar production is solved through the process combination of premixing the water-retaining thickening agent, the polycarboxylate superplasticizer, the thixotropic lubricant and the coagulant and then performing staged low-speed main mixing on the mixture and other raw materials; the effects of excellent waterproof and anti-seepage performance, excellent mechanical property and bonding strength, excellent crack resistance and high durability are achieved.

Description

Technical Field

[0001] This invention relates to the field of mortar preparation technology, and in particular to a high-performance waterproof dry powder mortar and its preparation method. Background Technology

[0002] Dry-mix mortar, also known as dry-precision mortar, is a granular or powdery mixture made by mixing dried and sieved aggregates (such as quartz sand), inorganic cementitious materials (such as cement), and functional additives (such as polymer powder, cellulose ether, and waterproofing agents) in a specific ratio. It is produced in a professional factory through precise batching and uniform mixing, and only requires the addition of water and stirring on-site for use. Dry-mix mortar offers advantages such as stable quality, environmental friendliness, high efficiency, and convenient construction, making it an indispensable key material in modern building construction, masonry, plastering, floor leveling, and waterproofing.

[0003] Although dry-mix mortar technology is becoming increasingly mature, the core of achieving specific functions, especially high-performance waterproofing, lies in the selection, proportioning, and interaction of raw material components. However, existing raw material systems have many inherent defects, which restrict further improvements in the waterproofing performance of products.

[0004] Problems with existing raw material composition systems: 1. Inherent hydrophilicity of the substrate: The cementitious material and hydration products of dry-mix mortar are hydrophilic, with numerous capillaries and microcracks providing channels for water migration. Simply increasing the cement content or reducing the water-cement ratio is insufficient to fundamentally block water penetration and achieve high-level waterproofing and seepage resistance; 2. Limitations of traditional waterproofing agents: The hydrophobic film formed by stearate-based waterproofing agents, widely used in the early stages, on the mortar pore walls is fragile, not wear-resistant, and has weak adhesion to the substrate. It is prone to failure under mechanical stress or long-term water immersion and also hinders mortar recoating and interfacial bonding strength; the effective components of some powdered waterproofing agents cannot migrate evenly within the mortar to form a unified hydrophobic network, resulting in uneven and short-lasting waterproofing effects; 3. Adding redispersible latex powder can improve flexibility and cohesion, but conventional powders are hydrophilic after film formation. Simply increasing the dosage cannot effectively improve waterproofing and may even cause adverse reactions. 4. Hydroxypropyl methylcellulose ether is an essential water-retaining and thickening component, but it is a water-soluble polymer with strong hydrophilicity. Excessive addition or in high temperature and high humidity environments will dissolve and retain a large amount of water, delaying cement hydration and leaving more pores after drying, thus weakening the overall waterproofing ability; 5. Poor compatibility and synergy between components: Cement, waterproofing agent, adhesive powder, cellulose ether and other components lack effective synergy. Traditional formulas are just physical superpositions, and the components may interfere with each other and produce negative effects. For example, a highly alkaline cement environment can cause some waterproofing agents to fail, and the high viscosity of cellulose ether can hinder the dispersion and migration of waterproofing agents, making it impossible to form a dense and seamless overall waterproofing system, and the potential of the material is not fully utilized.

[0005] In response to the aforementioned technologies, there is an urgent need in this field to develop a high-performance waterproof dry powder mortar and its preparation method; the improvement direction focuses on developing a composite waterproof system with synergistic effects of multiple components and multiple mechanisms. Summary of the Invention

[0006] To address the problem of mutual interference between components in traditional waterproof dry powder mortar, this application provides a high-performance waterproof dry powder mortar and its preparation method. By coordinating the proportions of each component, a composite waterproof system with synergistic effects of multiple mechanisms is constructed, achieving excellent waterproof and seepage-proof performance, superior mechanical properties and bonding strength, outstanding crack resistance, and high durability.

[0007] Firstly, this application provides a high-performance waterproof dry powder mortar, employing the following technical solution: A high-performance waterproof dry powder mortar comprises the following raw materials in parts by weight: 300-400 parts cement, 550-650 parts quartz sand, 1.5-3.0 parts silane waterproofing agent, 15-25 parts hydrophobic redispersible latex powder, and 4-11 parts functional additives. The cement is silicate cement, type 42.5R; The quartz sand is a mixture of 80-120 mesh quartz sand and 40-70 mesh quartz sand in a mass ratio of 1:(1.5-2); The silane waterproofing agent is isobutyltriethoxysilane.

[0008] By adopting the above scheme, silicate cement provides the main strength and alkaline environment to stimulate silane reactions; compounded quartz sand achieves the densest packing, reduces porosity, and provides a physically dense foundation; the reactive waterproofing agent hydrolyzes in the alkaline hydration environment, releasing active silanes that react with -Si-OH and Ca in the cement hydration products. 2+ A chemical reaction occurs, forming a robust hydrophobic silicone network that provides a long-lasting, overall hydrophobic effect. The redispersible latex powder ensures dispersibility, and the polymer film itself is hydrophobic after film formation, effectively blocking microcracks and pores, providing a flexible seal, and synergistically enhancing the effect with the silane hydrophobic network.

[0009] Preferably, the hydrophobic redispersible latex powder is a flexible ternary copolymer powder of vinyl acetate, ethylene and vinyl ester.

[0010] By adopting the above scheme, the hydrophobic redispersible latex powder composed of vinyl acetate, vinyl ester and ethylene terpolymer can be redispersed after contact with water. After film formation, it has excellent hydrophobicity and water resistance. Together with silane waterproofing agent, it forms a double waterproof barrier for mortar system.

[0011] Preferably, the functional additives include 0.2-0.5 parts of water-retaining thickener, 0.5-1.5 parts of polycarboxylate superplasticizer, 3-8 parts of thixotropic lubricant, and 0.3-1 parts of coagulant accelerator.

[0012] Preferably, the water-retaining thickener is hydrophobically modified hydroxypropyl methylcellulose ether with a viscosity of 40000 mPa·s.

[0013] Preferably, the thixotropic lubricant is high-purity bentonite.

[0014] Preferably, the coagulant is either lithium carbonate or calcium lignosulfonate.

[0015] By adopting the above scheme, polycarboxylate superplasticizers further reduce the water-cement ratio, decrease water consumption, and reduce the number of capillary pores from the source. Thixotropic lubricants improve the anti-sagging properties during construction and do not conflict with the hydrophobic system. Accelerators regulate setting time and ensure workability.

[0016] Preferably, the high-performance waterproof dry powder mortar further includes 20-50 parts of ultrafine filler; the ultrafine filler is either silica fume or kaolin.

[0017] By adopting the above scheme, the ultrafine filler particles are extremely fine at the micron level, which can fully fill the tiny pores between cement particles and sand particles, making the microstructure of the mortar more compact, greatly reducing the porosity, and thus significantly improving the impermeability, which is a kind of "physical waterproofing" enhancement.

[0018] Preferably, the high-performance waterproof dry powder mortar further includes 0.5-1.5 parts of polypropylene fiber, with a fiber length of 3-12 mm.

[0019] By adopting the above scheme, polypropylene fibers form a uniform three-dimensional network structure in the mortar, which can effectively inhibit plastic shrinkage and drying shrinkage, and reduce the generation of microcracks. Cracks are the main channels for water penetration, so reducing cracks at the source is equivalent to significantly improving long-term waterproof performance.

[0020] By adopting the above scheme, a "triple waterproof barrier" was constructed, which significantly improved the waterproof performance. The first layer of protection is a chemical hydrophobic barrier, the core of which is isobutyltriethoxysilane. It can penetrate into the mortar and react chemically with cement hydration products to generate a hydrophobic silicone resin network. This hydrophobicity is intrinsic and permanent; even if the surface is worn, the waterproofing effect remains. The second layer of protection is a flexible sealing barrier. After the hydrophobic redispersible latex powder forms a film, it creates a continuous, flexible, and self-hydrophobic polymer film that effectively seals capillary pores and microcracks, giving the mortar a certain degree of deformation capacity, compensating for shrinkage stress, and preventing cracking. The third layer of protection is a physically dense barrier. Ultrafine fillers fill the nanoscale pores between cement and sand particles; the rationally graded quartz sand achieves the densest packing; and the polycarboxylate superplasticizer reduces the water-cement ratio. These three factors work together to make the mortar extremely dense, greatly reducing the water penetration path. These three barriers are not simply superimposed but complement each other. The dense physical structure provides a larger reaction surface area for chemical hydrophobicity, the polymer film seals pores that the chemical hydrophobicity may not cover, and the chemical hydrophobicity ensures that the polymer film will not fail due to hydrophilicity.

[0021] Secondly, this application provides a method for preparing high-performance waterproof dry powder mortar, which adopts the following technical solution: S1 Weigh each raw material, and premix the water-retaining thickener, polycarboxylate superplasticizer, thixotropic lubricant and accelerator to obtain a mixture of functional additives; S2 involves first mixing cement and quartz sand in a mixer; then, S1's functional additive mixture, silane waterproofing agent, hydrophobic redispersible latex powder, ultrafine filler, and polypropylene fiber are added, followed by second-stage mixing until homogeneous. S3 will seal and moisture-proof the mixed finished product.

[0022] Preferably, in step S1, the premixing is performed at 800-1500 rpm for 1-2 minutes; in step S2, the first stage mixing is performed at a low speed of 30-60 rpm for 1-2 minutes, and the second stage mixing is performed at a low speed of 30-60 rpm for 5-8 minutes.

[0023] Preferably, in step S2, the mixer is a zero-gravity high-efficiency mixer or a dual-motion mixer; in step S3, the sealed moisture-proof packaging is a composite paper bag lined with polyethylene film and packaged by a fully automatic valve-sealed packaging machine.

[0024] By adopting the above scheme, which combines high-speed premixing of functional additives with low-speed primary mixing of other raw materials in stages, the technical problem of uneven dispersion of trace components in the production of high-performance mortar is solved.

[0025] In summary, this application has the following beneficial effects: 1. The high-performance waterproof dry powder mortar prepared in this application has excellent waterproof and seepage-proof performance: extremely low water absorption (≤2.5%), high water pressure resistance (365%), can withstand high water pressure for a long time, suitable for harsh environments such as underground structures, pools, and roofs, high durability and long-lasting effect, not easy to age or fail, and its service life far exceeds that of traditional waterproof materials; excellent mechanical properties and bonding strength, can bond firmly to various substrates (concrete, brick masonry, etc.); excellent crack resistance, effectively solving the problem of ordinary waterproof mortar being prone to cracking and failing as soon as it cracks; good construction adaptability, good workability of mortar, long water retention time, can be applied by manual plastering or mechanical spraying, and has a good construction experience.

[0026] 2. The preparation method of the high-performance waterproof dry powder mortar of this application solves the technical problem of uneven dispersion of trace components in the production of high-performance mortar by combining the process of high-speed premixing of functional additives with low-speed main mixing of other raw materials in stages. Detailed Implementation

[0027] The technical solution of this application is further illustrated by specific embodiments below. These specific embodiments do not represent a limitation on the scope of protection of this application. Any non-essential modifications and adjustments made by others based on the concept of this application still fall within the scope of protection of this application.

[0028] Unless otherwise specified, the experimental methods shown in the following examples are conventional methods. All reagents and materials shown are commercially available products.

[0029] Isobutyltriethoxysilane: Hangzhou Jessica Chemical Co., Ltd., CAS: 17980-47-1, grade: KH-242, content: 97%; Octyltriethoxysilane: Hangzhou Jessica Chemical Co., Ltd., CAS: 2943-75-1, Grade: KH-580; Hydrophobic redispersible latex powder: Wacker Chemie, Product model: 7031H; Hydroxypropyl methylcellulose ether (HPMC): Shandong Heda Group Co., Ltd., Product Model: HPK100M; Polycarboxylate superplasticizer: Shandong Landu New Material Co., Ltd., Product Model: 580P; High-purity bentonite: Lingshou County Shuntian Mineral Products Processing Plant, item number 4641, specification 325 mesh, effective ingredient content ≥85%; Lithium carbonate: Shanghai Oujin Industrial Co., Ltd., item number: QJ0009. Calcium lignosulfonate: Jinan Da Senlin Chemical Technology Co., Ltd., Product No.: 02; Silica fume: Hebei Hezhen Industrial Co., Ltd., Item No.: 03, Specification: 325 mesh; Kaolin: Guangzhou Zedanlu New Material Co., Ltd., Item No.: 1250, Model: 325 mesh; Polypropylene fiber: Topda (Shandong) New Material Technology Industry Group Co., Ltd., Item No.: TD-YUJ.

[0030] The present application will be further described in detail below with reference to embodiments and comparative examples. Example

[0031] Example 1 A method for preparing high-performance waterproof dry powder mortar, employing the following technical solution: S1 Weigh each raw material, and first premix the water-retaining thickener, polycarboxylate superplasticizer, thixotropic lubricant and coagulant at 1000 rpm for 2 min to obtain a functional additive mixture. S2 involves adding cement and quartz sand into a dual-motion mixer for the first stage of mixing, at a low speed of 40 rpm for 1.5 minutes; then adding the S1 functional additive mixture, silane waterproofing agent, hydrophobic redispersible latex powder, ultrafine filler, and polypropylene fiber for the second stage of mixing, at a low speed of 50 rpm for 7 minutes until homogeneous. S3 will seal the mixed finished product in a moisture-proof package. The moisture-proof package uses a composite paper bag lined with polyethylene film and is packaged using a fully automatic valve-sealed packaging machine.

[0032] The composition and dosage of the high-performance waterproof dry powder mortar are shown in Table 1: Table 1. Component dosage (kg) of high-performance waterproof dry powder mortar in Examples 1-8 Implementation Example 2 A high-performance waterproof dry powder mortar, which differs from Example 1 in that: In step S1, the premixing is 800 rpm for 2 minutes; in step S2, the first stage mixing is 30 rpm for 2 minutes, and the second stage mixing is 30 rpm for 8 minutes.

[0033] The composition and dosage of the high-performance waterproof dry powder mortar are shown in Table 1.

[0034] Example 3 A high-performance waterproof dry powder mortar, which differs from Example 1 in that: In step S1, the premixing is 1500 rpm for 1 min; in step S2, the first stage mixing is 60 rpm for 1 min and the second stage mixing is 60 rpm for 5 min.

[0035] The composition and dosage of the high-performance waterproof dry powder mortar are shown in Table 1.

[0036] Examples 4-8 A high-performance waterproof dry powder mortar, which differs from Example 1 in that the composition and dosage of the high-performance waterproof dry powder mortar are shown in Table 1.

[0037] Comparative Example 1 The difference from Example 8 is that isobutyltriethoxysilane and hydrophobic redispersible latex powder are not added.

[0038] Comparative Example 2 The difference from Example 8 is that ordinary VAE redispersible latex powder is used instead of hydrophobic redispersible latex powder.

[0039] Comparative Example 3 The difference from Example 8 is that calcium stearate is used instead of isobutyltriethoxysilane.

[0040] Comparative Example 4 The difference from Example 8 is that no ultrafine filler is added.

[0041] Comparative Example 5 The difference from Example 8 is that no polypropylene fibers are added.

[0042] Comparative Example 6 The difference from Example 8 is that ordinary HPMC is used instead of hydrophobically modified HPMC.

[0043] Comparative Example 7 The difference from Example 8 is that the quartz sand is not graded and all of it is 40-70 mesh sand.

[0044] Comparative Example 8 The difference from Example 8 is that the premixing step is omitted, and all raw materials are fed into the main mixer at once.

[0045] Comparative Example 9 The difference from Example 8 is that the second-stage mixing time is shortened to 2 minutes.

[0046] Performance testing 1. Flexural strength (MPa): The 28-day strength is tested according to the standard "JGJ / T 70-2009", which reflects the basic mechanical properties of the mortar.

[0047] 2. Compressive strength (MPa): The 28-day strength is tested according to the standard "JGJ / T 70-2009" to reflect the basic mechanical properties of the mortar.

[0048] 3. Water absorption rate (%): Refer to the standard "JGJ / T 70-2009" to test the water absorption rate after 24 hours of immersion, which directly reflects the waterproof performance.

[0049] 4. Water pressure ratio (%): Refer to "JC / T 984-2011" polymer cement waterproof mortar to test its ability to resist pressure water penetration. The higher the value, the better.

[0050] 5. 28-day shrinkage rate (%): This reflects the volume stability of the mortar. Excessive shrinkage rate will lead to cracking.

[0051] 6. Crack resistance: Apply a thin layer of mortar and observe the time and number of surface cracks in a dry environment for visual evaluation.

[0052] The high-performance waterproof dry powder mortar products of Examples 1-8 and Comparative Examples 1-9 were mixed at a powder-to-water ratio of 1:0.14, and the above performance tests were conducted. The test results are shown in Table 2. Table 2 Performance test results As can be seen from the performance test results in Table 2, Examples 1-5 have excellent and balanced performance. Among them, Example 1 has a water absorption rate of less than 2.5% and a water permeability pressure ratio of up to 315%, which proves that the basic formula design is very successful.

[0054] Examples 6-8 added ultrafine fillers and polypropylene fibers, and their overall performance was better than that of Examples 1-5. Among them, Example 8 had the best performance. Silica fume provided density, and the fiber inhibited the shrinkage tendency caused by silica fume. The two worked together perfectly to obtain a combination of high strength, low water absorption, high impermeability and low shrinkage, which fully demonstrated the technical advantages of "triple waterproof barrier" and "crack-resistant fiber".

[0055] In Comparative Example 1, without the addition of isobutyltriethoxysilane and hydrophobic redispersible latex powder, the performance deteriorated across the board, and the waterproof function was completely lost. The water absorption rate (12.8%) and water permeability pressure ratio (105%) indicate that its waterproof performance is no different from that of ordinary mortar, proving that isobutyltriethoxysilane and hydrophobic redispersible latex powder are the absolute core of the system's waterproof ability. The significant decrease in strength proves that the hydrophobic redispersible latex powder also plays a key role in improving mechanical properties, and shrinkage cracking indicates the lack of flexibility provided by the powder.

[0056] In Comparative Example 2, ordinary VAE redispersible latex powder was used instead of hydrophobic redispersible latex powder; the waterproof durability was significantly reduced. Although the water absorption rate (5.2%) and water pressure ratio (185%) were better than those of Comparative Example 1, they were far worse than those of Example 8. This proves that ordinary powder is hydrophilic after film formation and cannot effectively block water molecules. Its flexible sealing layer is not hydrophobic, resulting in a significant reduction in impermeability; at the same time, the mechanical strength was slightly reduced.

[0057] The use of calcium stearate instead of isobutyltriethoxysilane in Comparative Example 3 resulted in poor overall performance and weak waterproofing, demonstrating that the traditional physically adsorbed waterproofing agent is far less durable and stable than the chemically bonded silane waterproofing agent. The compressive strength (40.8 MPa) was the lowest because stearate introduces air bubbles and hinders cement hydration, severely weakening the matrix strength.

[0058] In Comparative Example 4, no ultrafine filler was added; the impermeability decreased significantly. The water absorption rate (3.85%) and the water pressure ratio (250%) indicate that the lack of physical filling with ultrafine filler resulted in higher porosity and more water channels inside the mortar.

[0059] In Comparative Example 5, no polypropylene fiber was added; the crack resistance was extremely poor, and the long-term durability was also reduced. The 28-day shrinkage rate (0.085%) increased significantly and obvious cracks appeared, proving that the crack-resistant effect of the fiber is irreplaceable. Although the short-term water absorption rate and impermeability data were acceptable, the cracks that had already appeared would become a fast channel for water intrusion, and the long-term waterproof performance would inevitably fail.

[0060] In Comparative Example 6, the use of ordinary HPMC instead of hydrophobic modified HPMC resulted in a decrease in waterproof performance and an increase in water absorption (3.1%), demonstrating that the hydrophilic ordinary HPMC itself adsorbs moisture and introduces more hydrophilic groups, thus disrupting the continuity of the overall hydrophobic network.

[0061] In the scheme of Comparative Example 7, the quartz sand was not graded and all 40-70 mesh sand was used. The strength and impermeability both decreased. Poor aggregate gradation led to a decrease in bulk density and an increase in porosity. Therefore, the compressive strength (43.5 MPa) and impermeability (230%) were significantly reduced. This proves that reasonable gradation is the physical basis for obtaining a high-density matrix.

[0062] In Comparative Example 8, the premixing step was eliminated, and all raw materials were fed into the main mixer at once. The overall performance declined. Due to the uneven dispersion of trace components, agglomeration occurred, forming local defects. This resulted in a decrease in strength, and the agglomerated areas were more susceptible to water penetration, leading to a significant deterioration in water absorption (4.8%) and impermeability (195%). This demonstrates that the premixing process is the key to ensuring consistent performance.

[0063] In Comparative Example 9, the second-stage mixing time was shortened to 2 minutes, resulting in insufficient mixing uniformity and a slight overall deterioration in performance. All performance indicators were worse than in Example 8, but slightly better than in Comparative Example 8. This demonstrates that a mixing time of 5-8 minutes is a necessary condition to ensure the uniform distribution of functional components, and insufficient time will prevent the full realization of the formulation's potential.

[0064] The test results above demonstrate that the high-performance waterproof dry powder mortar prepared in this application possesses excellent waterproof and seepage-resistant properties: extremely low water absorption (≤2.5%), high water pressure resistance (365%), capable of withstanding high water pressure for extended periods, suitable for harsh environments such as underground structures, pools, and roofs; high durability and long-lasting effect, not prone to aging or failure, with a service life far exceeding that of traditional waterproof materials; excellent mechanical properties and bonding strength, enabling strong adhesion to various substrates (concrete, brick masonry, etc.); outstanding crack resistance, effectively solving the problem of easy cracking and failure of ordinary waterproof mortar; good construction adaptability, good workability, long water retention time, suitable for both manual plastering and mechanical spraying, providing an excellent construction experience, fully embodying the technical advantages of "triple waterproof barrier" and "crack-resistant fiber".

[0065] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the present invention, they are protected by patent law.

Claims

1. A high-performance waterproof dry powder mortar, characterized in that, The raw materials include the following parts by weight: 300-400 parts cement, 550-650 parts quartz sand, 1.5-3.0 parts silane waterproofing agent, 15-25 parts hydrophobic redispersible latex powder, and 4-11 parts functional additives. The cement is silicate cement, type 42.5R; The quartz sand is a mixture of 80-120 mesh quartz sand and 40-70 mesh quartz sand in a mass ratio of 1:(1.5-2); The silane waterproofing agent is isobutyltriethoxysilane.

2. The high-performance waterproof dry powder mortar according to claim 1, characterized in that, The hydrophobic redispersible latex powder is a flexible ternary copolymer powder of vinyl acetate, ethylene and vinyl ester.

3. The high-performance waterproof dry powder mortar according to claim 1, characterized in that, The functional additives include 0.2-0.5 parts of water-retaining thickener, 0.5-1.5 parts of polycarboxylate superplasticizer, 3-8 parts of thixotropic lubricant, and 0.3-1 parts of coagulant accelerator.

4. The high-performance waterproof dry powder mortar according to claim 3, characterized in that, The water-retaining and thickening agent is hydrophobically modified hydroxypropyl methylcellulose ether with a viscosity of 40,000 mPa·s.

5. The high-performance waterproof dry powder mortar according to claim 3, characterized in that, The coagulant is either lithium carbonate or calcium lignosulfonate.

6. The high-performance waterproof dry powder mortar according to claim 1, characterized in that, It also includes 20-50 parts of ultrafine filler; the ultrafine filler is either silica fume or kaolin.

7. The high-performance waterproof dry powder mortar according to claim 1, characterized in that, The high-performance waterproof dry powder mortar also includes 0.5-1.5 parts of polypropylene fiber, with a fiber length of 3-12 mm.

8. A method for preparing high-performance waterproof dry powder mortar as described in any one of claims 1-7, characterized in that, It includes the following steps: S1 Weigh out each raw material, and premix the water-retaining thickener, polycarboxylate superplasticizer, thixotropic lubricant, and coagulating accelerator to obtain a mixture of functional additives; S2 involves first mixing cement and quartz sand in a mixer; then, S1's functional additive mixture, silane waterproofing agent, hydrophobic redispersible latex powder, ultrafine filler, and polypropylene fiber are added, followed by second-stage mixing until homogeneous. S3 will seal and moisture-proof the mixed finished product.

9. The method for preparing high-performance waterproof dry powder mortar according to claim 8, characterized in that: In step S1, the premixing is performed at 800-1500 rpm for 1-2 minutes; in step S2, the first stage mixing is performed at a low speed of 30-60 rpm for 1-2 minutes, and the second stage mixing is performed at a low speed of 30-60 rpm for 5-8 minutes.

10. The method for preparing high-performance waterproof dry powder mortar according to claim 8, characterized in that: In step S2, the mixer is a zero-gravity high-efficiency mixer or a dual-motion mixer; in step S3, the sealed moisture-proof packaging is a composite paper bag lined with polyethylene film and packaged by a fully automatic valve-sealed packaging machine.

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