High-weather-resistance industrial solid waste-based liquid coiled material waterproof coating

Abstract

The invention belongs to the field of building waterproof materials, and provides a high-weather-resistance industrial solid waste-based liquid coiled material waterproof coating which comprises the following components in percentage by weight: 20%-30% of acrylic emulsion, 25%-32% of composite industrial solid waste powder, 20%-25% of anionic emulsified asphalt, 2%-10% of water, 0.5%-1.5% of a dispersing agent, 0.5%-1% of an antioxidant and 0.1%-0.5% of a thickening agent, the composite industrial solid waste powder is prepared from the following raw materials in parts by weight: 20-30 parts of superfine slag powder, 15-25 parts of superfine steel slag powder, 15-25 parts of modified fly ash, 10-20 parts of modified red mud and 10-20 parts of modified carbide slag; the fineness of the composite industrial solid waste powder is 1000 to 1250 meshes. The method has the advantages and effects of low cost, environmental friendliness, simple and convenient process and balanced comprehensive performance.

Description

Technical Field

[0001] This invention relates to the field of building waterproofing materials technology, and in particular to a highly weather-resistant industrial solid waste-based liquid waterproofing membrane coating. Background Technology

[0002] Liquid waterproof membrane coatings, as a single-component, water-based, environmentally friendly product, offer advantages such as convenient application, suitability for complex substrates, and seamless curing, leading to their widespread use in construction, road, and water conservancy projects. Exposed liquid waterproof membrane coatings must withstand harsh environmental conditions such as long-term UV radiation, high and low temperature cycles, rainwater erosion, and acid rain corrosion; therefore, higher requirements are placed on their weather resistance, aging resistance, mechanical strength, and corrosion resistance.

[0003] Currently, traditional liquid roll waterproof coatings mostly use natural mineral fillers such as heavy calcium carbonate and talc, which are costly and have limited effect on improving weather resistance. Meanwhile, my country's industrial solid waste emissions are enormous. The stockpiling of solid wastes such as slag and steel slag from the metallurgical industry, fly ash from the power industry, and red mud and carbide slag from the chemical industry not only occupies large amounts of land but also causes environmental pollution. Although some patents have attempted to use single industrial solid wastes in waterproof coatings, such as the invention patent application CN121064689A, which discloses a weather-resistant, heat-insulating, and waterproof coating for exterior walls and its preparation method, by combining modified acrylic polymer emulsion with composite fillers, a multi-dimensional synergistic improvement in coating performance is achieved. This solves the defects of exterior wall coatings in terms of weather resistance, heat insulation, and waterproofing, achieving a coating with high weather resistance, low thermal conductivity, and good waterproofing performance.

[0004] However, the above-mentioned solutions have the following drawbacks: First, they rely on high-value raw materials such as cashew nut shell powder, piperazine silane coupling agent, and silica aerogel, which are expensive and have complex preparation processes involving molecular distillation, pre-emulsification, and two-step polymerization, resulting in high product costs and making them unsuitable for large-scale application in ordinary industrial and civil buildings. Second, they are not environmentally friendly and have weak sustainability. Although some fly ash cenospheres are used, the overall formula is still mainly based on chemically synthesized raw materials, which has limited capacity to dispose of large quantities of industrial solid waste and does not conform to the concept of resource recycling and green building materials. Summary of the Invention

[0005] The purpose of this invention is to provide a highly weather-resistant industrial solid waste-based liquid waterproof membrane coating that solves the above-mentioned technical problems, is low in cost, environmentally friendly, has a simple process, and has balanced overall performance.

[0006] The above-mentioned technical objective of this invention is achieved through the following technical solution: a high weather-resistant industrial solid waste-based liquid waterproof membrane coating, comprising the following components by weight percentage: 20%-30% acrylic emulsion, 25%-32% composite industrial solid waste powder, 20%-25% anionic emulsified asphalt, 2%-10% water, 0.5%-1.5% dispersant, 0.5%-1% antioxidant, and 0.1%-0.5% thickener;

[0007] The composite industrial solid waste powder is composed of the following raw materials in parts by weight: 20-30 parts of slag powder, 15-25 parts of steel slag powder, 15-25 parts of modified fly ash, 10-20 parts of modified red mud, and 10-20 parts of modified carbide slag; the fineness of the composite industrial solid waste powder is 1000-1250 mesh.

[0008] A further provision of the present invention is that the composite industrial solid waste powder is prepared by the following method:

[0009] S1. Raw material pretreatment: Red mud is washed, dealkalized, and dried; carbide slag is calcined at 600-650℃ for 2 hours; slag, steel slag, fly ash, red mud, and carbide slag are respectively crushed by jaw crusher and ball milled to 1000-1250 mesh to obtain slag powder, steel slag powder, fly ash powder, red mud powder, and carbide slag powder.

[0010] S2. Modification: The silane coupling agent is hydrolyzed in an ethanol-water solution with a pH of 4.0-5.5. Fly ash powder is added and stirred at 60-80℃ for 1.5-3.0 h. The mixture is then separated and dried to obtain modified fly ash. The amount of silane coupling agent added is 0.3%-1% of the mass of the fly ash powder. Alternatively, the silane coupling agent is first hydrolyzed in an ethanol-water solution, then preheated red mud powder is added and mixed and reacted at 60-80℃. Finally, an ethanol solution of stearic acid is added. The mixture was further mixed and coated at the same temperature and dried to obtain modified red mud with a total Fe2O3 and TiO2 content ≥30%. The amount of silane coupling agent and stearic acid added was 0.4%-1% of the mass of red mud powder, and the mass ratio of silane coupling agent to stearic acid was 2:1. The calcium carbide slag powder was added to a high-speed heating mixer and stirred. Calcium stearate was slowly added and stirred at high speed at 130℃ for 1~1.5h. After cooling to room temperature, modified calcium carbide slag with a hydrophobicity ≥95% was obtained.

[0011] Modified carbide slag with a Ca(OH)2 content ≥85% was obtained by using calcium stearate, wherein the amount of calcium stearate added was 0.3%-1% of the mass of carbide slag powder.

[0012] S3. Compounding: The pretreated slag powder, steel slag powder, modified fly ash, modified red mud, and modified carbide slag are mixed in proportion to obtain composite industrial solid waste powder.

[0013] A further setting of the present invention is that the solid content of the acrylic emulsion is 55 wt% and the pH is 7-8.

[0014] A further feature of the present invention is that the viscosity of the anionic emulsified asphalt is 10-15s and the solid content is ≥50%.

[0015] A further feature of the present invention is that the activity index (7d) of the slag powder is ≥75% and the free CaO content is ≤0.5%.

[0016] A further provision of the present invention is that the thickener is a polyurethane thickener, the antioxidant is hindered phenol 1076 or thioester DLTP, and the dispersant is a sodium polycarboxylate dispersant.

[0017] A method for preparing a highly weather-resistant industrial solid waste-based liquid waterproof membrane coating includes the following steps:

[0018] (1) Add water, dispersant and thickener to the reactor and stir at 500-800 r / min for 15-20 min until completely dissolved;

[0019] (2) Adjust the speed to 1000-1500 r / min, slowly add acrylic emulsion, stir for 25-30 min to form a uniform emulsion system;

[0020] (3) Keep the rotation speed constant and add the composite industrial solid waste powder in batches. Each addition should not exceed 25% of the total powder weight. Each batch should be 7-10 minutes apart. After all the powder has been added, continue stirring for 35-40 minutes.

[0021] (4) Adjust the rotation speed to 800-1000 r / min, add anionic emulsified asphalt, stir for 20-25 min until the system forms a uniform viscous liquid, and discharge the material to obtain a high weather-resistant industrial solid waste-based liquid waterproof membrane coating.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention uses five industrial solid wastes, namely slag, steel slag, fly ash, red mud, and carbide slag, as core functional powders after modification and compounding, replacing traditional natural mineral fillers. The solid waste content is as high as 25%-40%, which not only solves the pollution problem of industrial solid waste storage, but also reduces the cost of coating raw materials, achieving a win-win situation for environmental protection and economy.

[0024] 2. This invention utilizes the synergistic effect of composite industrial solid waste powders to form a multi-layered weather-resistant protection system consisting of ultraviolet shielding, physical barrier, chemical cross-linking, and pH buffering. Five modified solid wastes together constitute a physical isolation layer, improving weather resistance. In addition, the modified red mud, rich in Fe2O3 / TiO2, can absorb and reflect ultraviolet rays, forming ultraviolet protection; the Ca(OH)2 inside the modified carbide slag can neutralize acidic media such as acid rain, forming a chemical buffer; and the modified fly ash, with its spherical particle shape, helps to disperse stress and prevent crack propagation. This achieves a comprehensive protection system from physical barrier to chemical neutralization, and then to specific aging factor - ultraviolet rays. This allows the coating to not only resist initial physical intrusion but also maintain stable performance under long-term complex environmental conditions such as acid rain, ultraviolet rays, and temperature and humidity cycles, further improving weather resistance.

[0025] 3. This invention uses ultrafine slag / steel slag powder to fill the gaps between red mud and carbide slag particles. The spherical modified fly ash microspheres act as ball bearings, and the particles are densely packed, allowing the mixture to achieve a more compact filling state. This forms a rigid microskeleton with extremely low porosity in the coating film, which can block the direct penetration channels of water and corrosive media. The impermeability, hardness and overall mechanical strength of the coating film are greatly improved.

[0026] 4. All components of the five industrial solid wastes in this invention undergo targeted surface modification, transforming the hydrophilic inorganic surfaces of each component into hydrophobic surfaces that are compatible with the organic phase. This allows various solid waste particles that were originally incompatible with acrylic emulsions and asphalt to be uniformly and stably dispersed in the organic matrix and form a strong interfacial bond. There are no weak points at the interface, and stress can be effectively transferred, avoiding early failure caused by interfacial debonding. This significantly improves the adhesion, flexibility, and impact resistance of the coating. Detailed Implementation

[0027] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] A highly weather-resistant industrial solid waste-based liquid waterproof membrane coating comprises, by weight percentage: 20%-30% acrylic emulsion, 25%-32% composite industrial solid waste powder, 20%-25% anionic emulsified asphalt, 2%-10% water, 0.5%-1.5% dispersant, 0.5%-1% antioxidant, and 0.1%-0.5% thickener; wherein the composite industrial solid waste powder is composed of the following raw materials in parts by weight: 20 parts slag powder, 15 parts steel slag powder, and 1 part modified fly ash. 5 parts, modified red mud 10 parts, modified carbide slag 10 parts; the fineness of the composite industrial solid waste powder is 1000-1250 mesh; the solid content of the acrylic emulsion is 55wt%, the pH is 7-8, the viscosity of the anionic emulsified asphalt is 10-15s, the solid content is ≥50%, the activity index (7d) of the slag powder is ≥75%, and the free CaO content is ≤0.5%; the thickener is a polyurethane thickener, the antioxidant is hindered phenol 1076 and thioester DLTP, and the dispersant is a sodium polycarboxylate dispersant;

[0030] Composite industrial solid waste powder is prepared by the following method:

[0031] S1. Raw material pretreatment: Red mud is washed, dealkalized, and dried; carbide slag is calcined at 600-650℃ for 2 hours; slag, steel slag, fly ash, red mud, and carbide slag are respectively crushed by jaw crusher and ball milled to 1000-1250 mesh to obtain slag powder, steel slag powder, fly ash powder, red mud powder, and carbide slag powder.

[0032] S2. Modification: The silane coupling agent is hydrolyzed in an ethanol-water solution with a pH of 4.0-5.5. Fly ash powder is added and stirred at 60-80℃ for 1.5-3.0 h. The mixture is then separated and dried to obtain modified fly ash. The amount of silane coupling agent added is 0.3%-1% of the mass of the fly ash powder. Alternatively, the silane coupling agent is first hydrolyzed in an ethanol-water solution, then preheated red mud powder is added and mixed and reacted at 60-80℃. Finally, an ethanol solution of stearic acid is added. The mixture was further mixed and coated at the same temperature and dried to obtain modified red mud with a total Fe2O3 and TiO2 content ≥30%. The amount of silane coupling agent and stearic acid added was 0.4%-1% of the mass of red mud powder, and the mass ratio of silane coupling agent to stearic acid was 2:1. The calcium carbide slag powder was added to a high-speed heating mixer and stirred. Calcium stearate was slowly added and stirred at high speed at 130℃ for 1~1.5h. After cooling to room temperature, modified calcium carbide slag with a hydrophobicity ≥95% was obtained.

[0033] Modified carbide slag with a Ca(OH)2 content ≥85% was obtained by using calcium stearate, wherein the amount of calcium stearate added was 0.3%-1% of the mass of carbide slag powder.

[0034] S3. Compounding: The pretreated slag powder, steel slag powder, modified fly ash, modified red mud, and modified carbide slag are mixed in proportion to obtain composite industrial solid waste powder.

[0035] Example 2

[0036] A highly weather-resistant industrial solid waste-based liquid waterproof membrane coating comprises, by weight percentage: 20%-30% acrylic emulsion, 25%-32% composite industrial solid waste powder, 20%-25% anionic emulsified asphalt, 2%-10% water, 0.5%-1.5% dispersant, 0.5%-1% antioxidant, and 0.1%-0.5% thickener; wherein the composite industrial solid waste powder is composed of the following raw materials in parts by weight: 30 parts slag powder, 25 parts steel slag powder, and 2 parts modified fly ash. 5 parts, modified red mud 20 parts, modified carbide slag 20 parts; the fineness of the composite industrial solid waste powder is 1000-1250 mesh; the solid content of the acrylic emulsion is 55wt%, the pH is 7-8, the viscosity of the anionic emulsified asphalt is 10-15s, the solid content is ≥50%, the activity index (7d) of the slag powder is ≥75%, and the free CaO content is ≤0.5%; the thickener is a polyurethane thickener, the antioxidant is hindered phenol 1076 and thioester DLTP, and the dispersant is a sodium polycarboxylate dispersant;

[0037] Composite industrial solid waste powder is prepared by the following method:

[0038] S1. Raw material pretreatment: Red mud is washed, dealkalized, and dried; carbide slag is calcined at 600-650℃ for 2 hours; slag, steel slag, fly ash, red mud, and carbide slag are respectively crushed by jaw crusher and ball milled to 1000-1250 mesh to obtain slag powder, steel slag powder, fly ash powder, red mud powder, and carbide slag powder.

[0039] S2. Modification: The silane coupling agent is hydrolyzed in an ethanol-water solution with a pH of 4.0-5.5. Fly ash powder is added and stirred at 60-80℃ for 1.5-3.0 h. The mixture is then separated and dried to obtain modified fly ash. The amount of silane coupling agent added is 0.3%-1% of the mass of the fly ash powder. Alternatively, the silane coupling agent is first hydrolyzed in an ethanol-water solution, then preheated red mud powder is added and mixed and reacted at 60-80℃. Finally, an ethanol solution of stearic acid is added. The mixture was further mixed and coated at the same temperature and dried to obtain modified red mud with a total Fe2O3 and TiO2 content ≥30%. The amount of silane coupling agent and stearic acid added was 0.4%-1% of the mass of red mud powder, and the mass ratio of silane coupling agent to stearic acid was 2:1. The calcium carbide slag powder was added to a high-speed heating mixer and stirred. Calcium stearate was slowly added and stirred at high speed at 130℃ for 1~1.5h. After cooling to room temperature, modified calcium carbide slag with a hydrophobicity ≥95% was obtained.

[0040] Modified carbide slag with a Ca(OH)2 content ≥85% was obtained by using calcium stearate, wherein the amount of calcium stearate added was 0.3%-1% of the mass of carbide slag powder.

[0041] S3. Compounding: The pretreated slag powder, steel slag powder, modified fly ash, modified red mud, and modified carbide slag are mixed in proportion to obtain composite industrial solid waste powder.

[0042] Example 3

[0043] A highly weather-resistant industrial solid waste-based liquid waterproof membrane coating, comprising the following components by weight percentage: 20%-30% acrylic emulsion, 25%-32% composite industrial solid waste powder, 20%-25% anionic emulsified asphalt, 2%-10% water, 0.5%-1.5% dispersant, 0.5%-1% antioxidant, and 0.1%-0.5% thickener; wherein the composite industrial solid waste powder is composed of the following raw materials in parts by weight: 25 parts slag powder, 20 parts steel slag powder, and 2 parts modified fly ash. 0 parts, modified red mud 15 parts, modified carbide slag 15 parts; the fineness of the composite industrial solid waste powder is 1000-1250 mesh; the solid content of the acrylic emulsion is 55wt%, the pH is 7-8, the viscosity of the anionic emulsified asphalt is 10-15s, the solid content is ≥50%, the activity index (7d) of the slag powder is ≥75%, and the free CaO content is ≤0.5%; the thickener is a polyurethane thickener, the antioxidant is hindered phenol 1076 and thioester DLTP, and the dispersant is a sodium polycarboxylate dispersant;

[0044] Composite industrial solid waste powder is prepared by the following method:

[0045] S1. Raw material pretreatment: Red mud is washed, dealkalized, and dried; carbide slag is calcined at 600-650℃ for 2 hours; slag, steel slag, fly ash, red mud, and carbide slag are respectively crushed by jaw crusher and ball milled to 1000-1250 mesh to obtain slag powder, steel slag powder, fly ash powder, red mud powder, and carbide slag powder.

[0046] S2. Modification: The silane coupling agent is hydrolyzed in an ethanol-water solution with a pH of 4.0-5.5. Fly ash powder is added and stirred at 60-80℃ for 1.5-3.0 h. The mixture is then separated and dried to obtain modified fly ash. The amount of silane coupling agent added is 0.3%-1% of the mass of the fly ash powder. Alternatively, the silane coupling agent is first hydrolyzed in an ethanol-water solution, then preheated red mud powder is added and mixed and reacted at 60-80℃. Finally, an ethanol solution of stearic acid is added. The mixture was further mixed and coated at the same temperature and dried to obtain modified red mud with a total Fe2O3 and TiO2 content ≥30%. The amount of silane coupling agent and stearic acid added was 0.4%-1% of the mass of red mud powder, and the mass ratio of silane coupling agent to stearic acid was 2:1. The calcium carbide slag powder was added to a high-speed heating mixer and stirred. Calcium stearate was slowly added and stirred at high speed at 130℃ for 1~1.5h. After cooling to room temperature, modified calcium carbide slag with a hydrophobicity ≥95% was obtained.

[0047] Modified carbide slag with a Ca(OH)2 content ≥85% was obtained by using calcium stearate, wherein the amount of calcium stearate added was 0.3%-1% of the mass of carbide slag powder.

[0048] S3. Compounding: The pretreated slag powder, steel slag powder, modified fly ash, modified red mud, and modified carbide slag are mixed in proportion to obtain composite industrial solid waste powder.

[0049] Comparative Example 1

[0050] A high-weather-resistant industrial solid waste-based liquid waterproof membrane coating comprises, by weight percentage: 20%-30% acrylic emulsion, 25%-32% mixed industrial solid waste powder, 20%-25% anionic emulsified asphalt, 2%-10% water, 0.5%-1.5% dispersant, 0.5%-1% antioxidant, and 0.1%-0.5% thickener; wherein the mixed industrial solid waste powder is composed of the following raw materials in parts by weight: 20-30 parts slag powder, 15-25 parts steel slag powder, 15-25 parts fly ash powder, 10-20 parts red mud powder, and 10-20 parts calcium carbide slag powder; the fineness of the mixed industrial solid waste powder is 1000-1250 mesh.

[0051] Mixed industrial solid waste powder is prepared by the following method:

[0052] S1. Raw material pretreatment: Red mud is washed, dealkalized, and dried; carbide slag is calcined at 600-650℃ for 2 hours; slag, steel slag, fly ash, red mud, and carbide slag are respectively crushed by jaw crusher and ball milled to 1000-1250 mesh to obtain slag powder, steel slag powder, fly ash powder, red mud powder, and carbide slag powder.

[0053] S3. Compounding: Mix the pretreated slag powder, steel slag powder, fly ash powder, red mud powder, and carbide slag powder in a certain proportion to obtain mixed industrial solid waste powder.

[0054] Comparative Example 2

[0055] A highly weather-resistant industrial solid waste-based liquid waterproof membrane coating comprises, by weight percentage: 20%-30% acrylic emulsion, 25%-32% calcium carbonate powder, 20%-25% anionic emulsified asphalt, 2%-10% water, 0.5%-1.5% dispersant, 0.5%-1% antioxidant, and 0.1%-0.5% thickener; wherein the calcium carbonate powder has a fineness of 1000-1250 mesh.

[0056] The waterproof coatings were prepared by following the steps described above using the components from Examples 1 to 3, Comparative Example 1, and Comparative Example 2:

[0057] (1) Add water, dispersant and thickener to the reactor and stir at 500-800 r / min for 15-20 min until completely dissolved;

[0058] (2) Adjust the speed to 1000-1500 r / min, slowly add acrylic emulsion, stir for 25-30 min to form a uniform emulsion system;

[0059] (3) Keep the rotation speed constant and add the composite industrial solid waste powder (Example 1~Example 3) / mixed powder (Comparative Example 1) / calcium carbonate powder (Comparative Example 2) in batches. The amount added each time should not exceed 25% of the total weight of the powder. The interval between each batch is 7-10 minutes. After all the powder is added, continue stirring for 35-40 minutes.

[0060] (4) Adjust the rotation speed to 800-1000 r / min, add anionic emulsified asphalt, stir for 20-25 min until the system forms a uniform viscous liquid, and discharge the corresponding high weather-resistant industrial solid waste-based liquid waterproof membrane coatings 1-3, comparative example 1 waterproof coating, and comparative example 2 waterproof coating.

[0061] The above-mentioned waterproof coatings were tested as follows: elongation at break (GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"), resistance to artificial weathering (QUV accelerated aging chamber, 340nm ultraviolet lamp, 40℃ condensation + 60℃ drying cycle, gloss retention after 3000h), water contact angle, waterproof performance (GB / T 1733-1993), and acid and alkali resistance (GB / T 16777 (Building Waterproof Coatings) standard). The test results are summarized in Table 1.

[0062] Table 1

[0063] Acid resistance (168h) Alkali resistance (168h) QUV light retention rate Water contact angle / ° Waterproof time / d Elongation at break / % Example 1 No abnormalities No abnormalities 96% 138 ≥40 420 Example 2 No abnormalities No abnormalities 98% 137 ≥35 480 Example 3 No abnormalities No abnormalities 97% 138 ≥41 450 Comparative Example 1 foaming Severe blistering and peeling 70% 92 9 350 Comparative Example 2 No abnormalities Surface powdering 78% 120 12 280

[0064] As shown in Table 1, regarding corrosion resistance and durability, all examples showed "no abnormalities" after immersion in acid and alkali solutions for 168 hours, while Comparative Example 1 (unmodified powder) exhibited severe blistering and peeling, and Comparative Example 2 (calcium carbonate) also showed surface powdering. This indicates that the modification prevented the intrusion of water and ions along the hydrophilic interface, and the Ca(OH)2 in the modified carbide slag provided chemical buffering capacity. Regarding weather resistance, the examples achieved a gloss retention rate of 96%-98% after 3000 hours of QUV accelerated aging, far exceeding that of Comparative Example 1 (70%) and Comparative Example 2 (78%), demonstrating that the modified red mud effectively provided UV shielding. Simultaneously, the good interfacial bonding of all components collectively delayed the photo-oxidative aging process of the coating. Regarding hydrophobic and waterproof performance, the water contact angle of the examples reached 137°~138°, exhibiting a superhydrophobic state, and the waterproof time was longer than 35 days, superior to the comparative examples, indicating comprehensive surface hydrophobic modification (silane, stearic acid, calcium stearate). It greatly reduces the surface energy of the coating film, and works in conjunction with the tightly packed powder skeleton to form a strong waterproof defense. In terms of mechanical properties, the elongation at break of the embodiment (420%-480%) is significantly higher than that of Comparative Example 1 (350%) and Comparative Example 2 (280%), indicating that the spherical shape of the modified fly ash plays the role of "ball bearing" and stress dispersion, effectively improving the flexibility and crack resistance of the coating film.

Claims

1. A highly weather-resistant industrial solid waste-based liquid waterproof membrane coating, characterized in that: By weight percentage, it includes the following components: 20%-30% acrylic emulsion, 25%-32% composite industrial solid waste powder, 20%-25% anionic emulsified asphalt, 2%-10% water, 0.5%-1.5% dispersant, 0.5%-1% antioxidant, and 0.1%-0.5% thickener; The composite industrial solid waste powder is composed of the following raw materials in parts by weight: 20-30 parts of slag powder, 15-25 parts of steel slag powder, 15-25 parts of modified fly ash, 10-20 parts of modified red mud, and 10-20 parts of modified carbide slag; the fineness of the composite industrial solid waste powder is 1000-1250 mesh.

2. The high weather-resistant industrial solid waste-based liquid waterproof membrane coating according to claim 1, characterized in that: The composite industrial solid waste powder is prepared by the following method: S1. Raw material pretreatment: Red mud is washed, dealkalized, and dried; carbide slag is calcined at 600-650℃ for 2 hours; slag, steel slag, fly ash, red mud, and carbide slag are respectively crushed by jaw crusher and ball milled to 1000-1250 mesh to obtain slag powder, steel slag powder, fly ash powder, red mud powder, and carbide slag powder. S2. Modification: The silane coupling agent is hydrolyzed in an ethanol-water solution with a pH of 4.0-5.

5. Fly ash powder is added and stirred at 60-80℃ for 1.5-3.0 h. The mixture is then separated and dried to obtain modified fly ash. The amount of silane coupling agent added is 0.3%-1% of the mass of the fly ash powder. Alternatively, the silane coupling agent is first hydrolyzed in an ethanol-water solution, then preheated red mud powder is added and mixed and reacted at 60-80℃. Finally, an ethanol solution of stearic acid is added. The mixture was further mixed and coated at the same temperature and dried to obtain modified red mud with a total Fe2O3 and TiO2 content ≥30%. The amount of silane coupling agent and stearic acid added was 0.4%-1% of the mass of red mud powder, and the mass ratio of silane coupling agent to stearic acid was 2:

1. The calcium carbide slag powder was added to a high-speed heating mixer and stirred. Calcium stearate was slowly added and stirred at high speed at 130℃ for 1~1.5h. After cooling to room temperature, modified calcium carbide slag with a hydrophobicity ≥95% was obtained. Modified carbide slag with a Ca(OH)2 content ≥85% was obtained by using calcium stearate, wherein the amount of calcium stearate added was 0.3%-1% of the mass of carbide slag powder. S3. Compounding: The pretreated slag powder, steel slag powder, modified fly ash, modified red mud, and modified carbide slag are mixed in proportion to obtain composite industrial solid waste powder.

3. The high weather-resistant industrial solid waste-based liquid waterproof membrane coating according to claim 1, characterized in that: The acrylic emulsion has a solid content of 55 wt% and a pH of 7-8.

4. The high weather-resistant industrial solid waste-based liquid waterproof membrane coating according to claim 1, characterized in that: The viscosity of the anionic emulsified asphalt is 10-15s, and the solid content is ≥50%.

5. The high weather-resistant industrial solid waste-based liquid waterproof membrane coating according to claim 1, characterized in that: The slag powder has an activity index (7d) ≥ 75% and a free CaO content ≤ 0.5%.

6. The high weather-resistant industrial solid waste-based liquid waterproof membrane coating according to claim 1, characterized in that: The thickener is a polyurethane thickener, the antioxidant is hindered phenol 1076 and thioester DLTP, and the dispersant is a sodium polycarboxylate dispersant.

7. A method for preparing a high weather-resistant industrial solid waste-based liquid waterproof membrane coating according to any one of claims 1-6, characterized in that: Includes the following steps: (1) Add water, dispersant and thickener to the reactor and stir at 500-800 r / min for 15-20 min until completely dissolved; (2) Adjust the speed to 1000-1500 r / min, slowly add acrylic emulsion, stir for 25-30 min to form a uniform emulsion system; (3) Keep the rotation speed constant and add the composite industrial solid waste powder in batches. Each addition should not exceed 25% of the total powder weight. Each batch should be 7-10 minutes apart. After all the powder has been added, continue stirring for 35-40 minutes. (4) Adjust the rotation speed to 800-1000 r / min, add anionic emulsified asphalt, stir for 20-25 min until the system forms a uniform viscous liquid, and discharge the material to obtain a high weather-resistant industrial solid waste-based liquid waterproof membrane coating.