An efficient and low-carbon curing agent for mud and its preparation method

Abstract

The present invention relates to the technical field of building materials, and discloses a high-efficiency and low-carbon curing agent for mud and a preparation method thereof. The mud curing agent prepared by the present invention comprises the following raw materials in parts by weight: 5-10 parts of polyacrylamide, 10-15 parts of modified hyperbranched polymer, 1-3 parts of polyacrylate, 4-8 parts of calcium carbonate, 3-7 parts of calcium sulfate, 1-3 parts of sodium silicate, 10-12 parts of alumina, and 3-6 parts of industrial waste residue; the curing agent of the present invention has high curing efficiency for mud, shortens the curing time, and at the same time improves the strength and water resistance of the solidified mud after curing. The utilization of industrial waste residue can not only improve the curing efficiency, but also reduce costs and have the effect of low-carbon environmental protection. Therefore, when the curing agent is used for mud curing, it can reduce carbon emissions, reduce energy consumption and environmental pollution, and has certain environmental protection properties.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly relates to a high-efficiency and low-carbon curing agent for slurry and a preparation method thereof. Background Technique

[0002] The application of slurry curing agents is mainly aimed at the treatment of a large amount of waste slurry generated in construction projects. With the rapid development of urbanization and infrastructure construction, the amount of waste slurry generated during pile foundation engineering, shield construction, etc. is huge. If not properly treated, it will cause serious environmental pollution. Traditional treatment methods include direct discharge, safe formation discharge, backfilling or sealing, etc., but these methods all have problems of environmental pollution risk or low efficiency. To solve these problems, researchers have developed slurry curing technology. By adding a curing agent, particles in the slurry are induced to combine to form a stable solid structure, thereby reducing the environmental impact and improving resource utilization efficiency. The application of slurry curing technology can not only reduce waste generation, reduce dependence on natural resources, but also convert waste slurry into useful building materials, such as subgrade fillers, foundation reinforcement materials, etc.

[0003] The selection of the curing agent is crucial for the slurry curing effect. Traditional curing agents such as cement and lime have problems of high cost and environmental unfriendliness. Therefore, the development of new low-carbon soil curing cementitious materials has become a research hotspot. Most curing agents are based on the curing principle of inorganic cementitious systems, and their setting speed and early strength are still not ideal, and the potential for later strength growth is limited, which restricts the application of curing agents in various fields. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a high-efficiency and low-carbon curing agent for slurry and a preparation method thereof.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A high-efficiency and low-carbon curing agent for slurry, comprising the following raw materials in parts by weight: 5 - 10 parts of polyacrylamide, 10 - 15 parts of modified hyperbranched polymer, 1 - 3 parts of polyacrylate, 4 - 8 parts of calcium carbonate, 3 - 7 parts of calcium sulfate, 1 - 3 parts of sodium silicate, 10 - 12 parts of alumina, 3 - 6 parts of industrial waste residue;

[0007] The modified hyperbranched polymer is prepared by the following steps:

[0008] Step A1: Disperse cetyltrimethylammonium bromide in deionized water, add 0.1 mol / L hydrochloric acid and stir for 20 - 30 min. Then add tetraethyl orthosilicate and heat to 60 - 80 °C for reaction for 8 - 12 h. Centrifuge, wash, and dry, collect the product. Redisperse the product in ethanolamine ethanol solution and reflux extract at 90 °C for 12 h, and then repeat the extraction once to obtain mesoporous silica;

[0009] Step A2: Disperse toluene - 2,5 - diisocyanate and sodium hydroxide in toluene, then add γ - aminopropyltriethoxysilane and heat to 70 °C, react for 12 - 18 h under nitrogen atmosphere. Rotary evaporate, collect the product, and dry to obtain modified silane;

[0010] Step A3: Mix the modified silane and triethylamine in toluene, then add mesoporous silica and ultrasonically disperse for 30 min, and then carry out condensation reflux reaction at 110 - 120 °C for 2.5 - 3.5 h. Centrifuge, wash, and dry to obtain graft - modified silica;

[0011] Step A4: Disperse the graft - modified silica and sodium hydroxide in toluene, heat to 60 - 70 °C, add ethylenediamine, react for 5 - 8 h under nitrogen atmosphere. Rotary evaporate and collect the intermediate product. Redisperse the intermediate product in tetrahydrofuran, and then slowly drop it into trimethylolpropane triacrylate and react at 30 - 50 °C for 5 - 7 h. Carry out vacuum distillation to obtain terminal - double - bond hyperbranched polymer;

[0012] Step A5: Mix the terminal - double - bond hyperbranched polymer, sodium sulfite, and sodium nitrate, heat to 80 - 90 °C, then dropwise add 0.05 - 0.08 mol / L sodium bisulfite aqueous solution, maintain the temperature for reflux reaction for 8 - 10 h. Filter, wash, and dry to obtain modified hyperbranched polymer;

[0013] Further, in step A1, the dosage ratio of cetyltrimethylammonium bromide, deionized water, hydrochloric acid, tetraethyl orthosilicate, and ethanolamine ethanol solution is 0.6 - 0.9 g : 60 mL : 4 - 6 g : 3 - 4.5 mL : 100 mL;

[0014] Further, in step A1, the volume ratio of ethanolamine to ethanol in the ethanolamine ethanol solution is 1 : 4;

[0015] Further, in step A2, the dosage ratio of toluene - 2,5 - diisocyanate, sodium hydroxide, toluene, and γ - aminopropyltriethoxysilane is 0.015 - 0.03 mol : 0.01 - 0.05 g : 25 - 50 mL : 0.015 - 0.03 mol;

[0016] Further, in step A3, the dosage ratio of the modified silane, triethylamine, toluene, and mesoporous silica is 1-2 g: 5-10 mL: 100 mL: 3-5 g;

[0017] Further, in step A4, the dosage ratio of the graft-modified silica, sodium hydroxide, toluene, and ethylenediamine in the intermediate product is 1-3 g: 0.005-0.03 g: 100 mL: 0.008-0.02 mol;

[0018] Further, in step A4, the dosage ratio of the intermediate product, tetrahydrofuran, and trimethylolpropane triacrylate in the terminal double bond hyperbranched polyester is 1-3 g: 100 mL: 0.016-0.04 mol;

[0019] Further, in step A5, the dosage ratio of the terminal double bond hyperbranched polymer, sodium sulfite, sodium nitrate, and aqueous sodium bisulfite solution is 1-3 g: 0.003-0.006 mol: 0.01-0.03 g: 100 mL.

[0020] A preparation method of a high-efficiency and low-carbon mud curing agent includes the following steps:

[0021] Weigh the raw materials by weight. Add calcium carbonate, calcium sulfate, sodium silicate, alumina, and industrial waste residue into a stirrer, stir evenly at a speed of 150-250 rpm, then add polyacrylamide, modified hyperbranched polymer, and polyacrylate, and stir evenly at a speed of 350-450 rpm to obtain the high-efficiency and low-carbon mud curing agent.

[0022] The beneficial effects of the present invention:

[0023] The mud curing agent prepared by the present invention uses polyacrylamide and modified hyperbranched polymer as the matrix, and adds water-absorbing resin, calcium carbonate and other curing aids, which improves the curing efficiency of the curing agent for mud, shortens the curing time, and at the same time improves the strength and water resistance of the solidified mud. The utilization of industrial waste residue can not only improve the curing efficiency, but also reduce costs and have the effect of low-carbon environmental protection. Therefore, when this curing agent is used for mud curing, it can reduce carbon emissions, reduce energy consumption and environmental pollution, and has a certain environmental protection property.

[0024] As a water-absorbing resin, polyacrylic acid resin can act together with calcium sulfate to quickly and efficiently remove the water molecules between the particles in the mud and reduce the water content inside the solidified mud; calcium carbonate can significantly increase the content of solids in the mud. By reacting with the water in the mud to generate heat, calcium hydrate or calcium hydroxide is formed. This process not only increases the solid content of the sludge, but also under the action of the heat released by the hydration reaction, the system temperature will rise, which helps to sterilize and reduce pathogenic microorganisms, realizing the harmless treatment of the mud.

[0025] In the modified hyperbranched polymer, first, cetyltrimethylammonium bromide is used as a template agent and tetraethyl orthosilicate is used as a silicon source to prepare mesoporous silica; then, the condensation reaction between the isocyanate group in toluene-2,5-diisocyanate and the amino group in γ-aminopropyltriethoxysilane is utilized to synthesize a modified silane containing a terminal isocyanate group; then, the modified silane is used as a graft modifier to perform surface grafting on the mesoporous silica to obtain graft-modified silica with an isocyanate group on the surface; then, the isocyanate group in the graft-modified silica reacts with ethylenediamine to obtain an intermediate product containing a urea bond, and the amino group in the intermediate product can also react with the double bond in trimethylolpropane triacrylate to generate a terminal double bond hyperbranched polymer with a double bond structure at the end; finally, the terminal double bond hyperbranched polymer is sulfonated to synthesize the modified hyperbranched polymer. The introduction of the modified hyperbranched polymer can improve the water resistance and curing efficiency of the curing agent and shorten the curing time; among them, the sulfonic acid group contained at the end of the polymer exists in the form of a negative charge in the slurry, can adsorb metal cations in the slurry, make them form larger aggregates, so that the metal ions form precipitates, greatly promoting the flocculation effect and improving the curing efficiency; the hyperbranched polymer with a core-shell structure can utilize its unique three-dimensional spherical structure and the active groups on the shell branches to interact with the slurry particles to form a three-dimensional network structure in the slurry, thereby improving the curing efficiency and performance of the slurry. At the same time, the mesoporous silica in the core layer can also utilize the mesoporous structure to adsorb heavy metals in the slurry and reduce the heavy metal content; in addition, the urea bond in the branched structure has excellent water resistance, can effectively improve the waterproof performance of the curing agent, and make the consolidated body after slurry pressure filtration remain stable in a humid or underwater environment without secondary sludging. Detailed implementation mode

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] Example 1

[0028] The modified hyperbranched polymer is prepared by the following steps:

[0029] Step A1: Disperse 0.6 g of cetyltrimethylammonium bromide in 60 mL of deionized water, add 4 g of 0.1 mol / L hydrochloric acid and stir for 20 min. Then add 3 mL of tetraethyl orthosilicate and heat to 60 °C for reaction for 8 h. Centrifuge, wash, and dry, collect the product. Redisperse the product in 100 mL of ethanolamine ethanol solution and reflux extract at 90 °C for 12 h, and then repeat the extraction once to obtain mesoporous silica. The volume ratio of ethanolamine to ethanol in the ethanolamine ethanol solution is 1:4;

[0030] Step A2: Disperse 0.015 mol of toluene-2,5-diisocyanate and 0.01 g of sodium hydroxide in 25 mL of toluene, then add 0.015 mol of γ-aminopropyltriethoxysilane and heat to 70 °C, and react for 12 h under nitrogen atmosphere. Rotary evaporate, collect the product, and dry to obtain modified silane;

[0031] Step A3: Mix 1 g of modified silane and 5 mL of triethylamine in 100 mL of toluene, then add 3 g of mesoporous silica and ultrasonically disperse for 30 min, and then carry out condensation reflux reaction at 110 °C for 2.5 h. Centrifuge, wash, and dry to obtain graft-modified silica;

[0032] Step A4: Disperse 1 g of graft-modified silica and 0.005 g of sodium hydroxide in 100 mL of toluene, heat to 60 °C, add 0.008 mol of ethylenediamine, and react for 5 h under nitrogen atmosphere. Rotary evaporate and collect the intermediate product; Redisperse 1 g of the intermediate product in 100 mL of tetrahydrofuran, and then slowly drop it into 0.016 mol of trimethylolpropane triacrylate and react at 30 °C for 5 h, and carry out vacuum distillation to obtain terminal double bond hyperbranched polymer;

[0033] Step A5: Mix 1 g of terminal double bond hyperbranched polymer, 0.003 mol of sodium sulfite, and 0.01 g of sodium nitrate, then heat to 80 °C, and then dropwise add 100 mL of 0.05 mol / L sodium bisulfite aqueous solution, maintain the temperature and reflux react for 8 h, filter, wash, and dry to obtain modified hyperbranched polymer.

[0034] Example 2

[0035] The modified hyperbranched polymer is prepared by the following steps:

[0036] Step A1: Disperse 0.75 g of cetyltrimethylammonium bromide in 60 mL of deionized water, add 5 g of 0.1 mol / L hydrochloric acid and stir for 25 min. Then add 4 mL of tetraethyl orthosilicate and heat to 70 °C for reaction for 10 h. Centrifuge, wash, and dry, collect the product. Redisperse the product in 100 mL of ethanolamine ethanol solution and reflux extract at 90 °C for 12 h, and repeat the extraction once to obtain mesoporous silica. The volume ratio of ethanolamine to ethanol in the ethanolamine ethanol solution is 1:4;

[0037] Step A2: Disperse 0.02 mol of toluene-2,5-diisocyanate and 0.03 g of sodium hydroxide in 35 mL of toluene, then add 0.02 mol of γ-aminopropyltriethoxysilane and heat to 70 °C. React under nitrogen for 15 h, rotary evaporate, collect the product, and dry to obtain the modified silane;

[0038] Step A3: Mix 1.5 g of the modified silane and 7.5 mL of triethylamine in 100 mL of toluene, then add 4 g of mesoporous silica and ultrasonically disperse for 30 min. Then carry out condensation reflux reaction at 115 °C for 3 h, centrifuge, wash, and dry to obtain the graft-modified silica;

[0039] Step A4: Disperse 2 g of the graft-modified silica and 0.015 g of sodium hydroxide in 100 mL of toluene, heat to 65 °C, add 0.012 mol of ethylenediamine, and react under nitrogen for 6 h. Rotary evaporate and collect the intermediate product; Redisperse 2 g of the intermediate product in 100 mL of tetrahydrofuran, and then slowly drop it into 0.025 mol of trimethylolpropane triacrylate and react at 40 °C for 6 h. Carry out vacuum distillation to obtain the terminal double-bond hyperbranched polymer;

[0040] Step A5: Mix 2 g of the terminal double-bond hyperbranched polymer, 0.0045 mol of sodium sulfite, and 0.02 g of sodium nitrate, then heat to 85 °C, and then dropwise add 100 mL of 0.065 mol / L sodium bisulfite aqueous solution. Maintain the temperature and reflux react for 9 h. Filter, wash, and dry to obtain the modified hyperbranched polymer.

[0041] Example 3

[0042] The modified hyperbranched polymer is prepared by the following steps:

[0043] Step A1: Disperse 0.9 g of cetyltrimethylammonium bromide in 60 mL of deionized water, add 6 g of 0.1 mol / L hydrochloric acid and stir for 30 min. Then add 4.5 mL of tetraethyl orthosilicate and heat to 80 °C for reaction for 12 h. Centrifuge, wash, and dry, collect the product. Redisperse the product in 100 mL of ethanolamine ethanol solution and reflux extract at 90 °C for 12 h, and then repeat the extraction once to obtain mesoporous silica. The volume ratio of ethanolamine to ethanol in the ethanolamine ethanol solution is 1:4;

[0044] Step A2: Disperse 0.03 mol of toluene-2,5-diisocyanate and 0.05 g of sodium hydroxide in 50 mL of toluene, then add 0.03 mol of γ-aminopropyltriethoxysilane and heat to 70 °C. React under nitrogen for 18 h, rotary evaporate, collect the product, and dry to obtain modified silane;

[0045] Step A3: Mix 2 g of modified silane and 10 mL of triethylamine in 100 mL of toluene, then add 5 g of mesoporous silica and ultrasonically disperse for 30 min. Then carry out condensation reflux reaction at 120 °C for 3.5 h, centrifuge, wash, and dry to obtain graft-modified silica;

[0046] Step A4: Disperse 3 g of graft-modified silica and 0.03 g of sodium hydroxide in 100 mL of toluene, heat to 70 °C, add 0.02 mol of ethylenediamine, and react under nitrogen for 8 h. Rotary evaporate and collect the intermediate product. Redisperse 3 g of the intermediate product in 100 mL of tetrahydrofuran, and then slowly add it dropwise to 0.04 mol of trimethylolpropane triacrylate and react at 50 °C for 7 h. Carry out vacuum distillation to obtain terminal double bond hyperbranched polymer;

[0047] Step A5: Mix 3 g of terminal double bond hyperbranched polymer, 0.006 mol of sodium sulfite, and 0.03 g of sodium nitrate, then heat to 90 °C, and then dropwise add 100 mL of 0.08 mol / L sodium bisulfite aqueous solution. Maintain the temperature and reflux react for 10 h. Filter, wash, and dry to obtain modified hyperbranched polymer.

[0048] Example 4

[0049] A preparation method of a high-efficiency low-carbon curing agent for mud comprises the following steps:

[0050] 5 parts of polyacrylamide, 10 parts of the modified hyperbranched polymer prepared in Example 1, 1 part of polyacrylate, 4 parts of calcium carbonate, 3 parts of calcium sulfate, 1 part of sodium silicate, 10 parts of alumina, 3 parts of blast furnace slag;

[0051] Weigh the raw materials by weight parts. Add calcium carbonate, calcium sulfate, sodium silicate, alumina and blast furnace slag into a stirrer, and stir evenly at a speed of 150 rpm. Then add polyacrylamide, the modified hyperbranched polymer prepared in Example 1 and polyacrylate, and stir evenly at a speed of 350 rpm to obtain a high-efficiency low-carbon curing agent for mud.

[0052] Example 5

[0053] A preparation method of a high-efficiency low-carbon curing agent for mud comprises the following steps:

[0054] 7 parts of polyacrylamide, 12 parts of the modified hyperbranched polymer prepared in Example 2, 2 parts of polyacrylate, 6 parts of calcium carbonate, 5 parts of calcium sulfate, 2 parts of sodium silicate, 11 parts of alumina, 5 parts of blast furnace slag;

[0055] Weigh the raw materials by weight parts. Add calcium carbonate, calcium sulfate, sodium silicate, alumina and blast furnace slag into a stirrer, and stir evenly at a speed of 200 rpm. Then add polyacrylamide, the modified hyperbranched polymer prepared in Example 2 and polyacrylate, and stir evenly at a speed of 400 rpm to obtain a high-efficiency low-carbon curing agent for mud.

[0056] Example 6

[0057] A preparation method of a high-efficiency low-carbon curing agent for mud comprises the following steps:

[0058] 10 parts of polyacrylamide, 15 parts of the modified hyperbranched polymer prepared in Example 3, 3 parts of polyacrylate, 8 parts of calcium carbonate, 7 parts of calcium sulfate, 3 parts of sodium silicate, 12 parts of alumina, 6 parts of blast furnace slag;

[0059] Weigh the raw materials by weight parts. Add calcium carbonate, calcium sulfate, sodium silicate, alumina and blast furnace slag into a stirrer, and stir evenly at a speed of 250 rpm. Then add polyacrylamide, the modified hyperbranched polymer prepared in Example 3 and polyacrylate, and stir evenly at a speed of 450 rpm to obtain a high-efficiency low-carbon curing agent for mud.

[0060] Comparative Example 1

[0061] This comparative example is a mud curing agent, which is different from Example 6 in that a commercially available hyperbranched polyester is used instead of the modified hyperbranched polymer prepared in Example 3, and the rest are the same.

[0062] Comparative Example 2

[0063] This comparative example is a mud curing agent, which is different from Example 6 in that silica is used instead of calcium carbonate, and the rest are the same.

[0064] A solidification experiment was carried out on a certain waste mud (with a water content of 85.8%). The dosage of the solidifying agent (prepared in Examples 4-6 and Comparative Examples 1-2) was 5% of the mass of the mud. The mud was treated, and the solidified mud was tested in accordance with the "Identification Standard for Hazardous Wastes - Identification of Leaching Toxicity" (GB5085.03-2019) and the "Standard for Geotechnical Test Methods" (GB / T50123-2019).

[0065] The test results are shown in the following table:

[0066]

[0067] As can be seen from the above table, after treating the mud with the mud solidifying agent prepared by the present invention, the water content of the mud solidified matter is in the range of 23.9%-24.6% at 14 days, the unconfined compressive strength at 28 days is in the range of 1.55 MPa - 1.60 MPa, and the strength loss rate after 10 freeze-thaw cycles at 28 days is in the range of 15.2%-15.5%. This shows that the use of this solidifying agent can significantly improve the solidification efficiency, waterproof performance, and consolidation strength of the mud, and reduce carbon emissions, energy consumption, and environmental pollution, having certain environmental protection properties.

[0068] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A high-efficiency low-carbon curing agent for mud, characterized in that: The invention comprises the following raw materials in parts by weight: 5-10 parts of polyacrylamide, 10-15 parts of modified hyperbranched polymer, 1-3 parts of polyacrylate, 4-8 parts of calcium carbonate, 3-7 parts of calcium sulfate, 1-3 parts of sodium silicate, 10-12 parts of aluminum oxide and 3-6 parts of industrial waste residue; The modified hyperbranched polymer is prepared by the following steps: Step A1, dispersing hexadecyltrimethylammonium bromide in deionized water, adding 0.1mol / L hydrochloric acid and stirring for 20-30min, then adding tetraethyl orthosilicate, and heating to 60-80°C for reaction for 8-12h, centrifuging, washing, drying, collecting the product, and re-dispersing the product in an ethanolamine ethanol solution, and reflux extraction at 90°C for 12h, and then repeating the extraction once to obtain mesoporous silica, the amount ratio of hexadecyltrimethylammonium bromide, deionized water, hydrochloric acid, tetraethyl orthosilicate and ethanolamine ethanol solution is 0.6-0.9g:60mL:4-6g:3-4.5mL:100mL; Step A2, dispersing toluene-2,5-diisocyanate and sodium hydroxide in toluene, adding γ-aminopropyltriethoxysilane, and heating to 70° C., reacting under nitrogen for 12-18 hours, rotary evaporating, collecting the product, and drying to obtain modified silane; Step A3, mixing the modified silane and triethylamine in toluene, adding mesoporous silica and ultrasonically dispersing for 30 minutes, and then condensing and refluxing at 110-120° C. for 2.5-3.5 hours, centrifuging, washing, and drying to obtain grafted modified silica; Step A4, dispersing the grafted modified silica and sodium hydroxide in toluene, heating to 60-70° C., adding ethylenediamine, reacting for 5-8 hours under nitrogen conditions, rotary evaporating, and collecting the intermediate product; re-dispersing the intermediate product in tetrahydrofuran, and then slowly adding it dropwise to trimethylolpropane triacrylate, reacting at 30-50° C. for 5-7 hours, and distilling under reduced pressure to obtain a terminal double-bond hyperbranched polymer; Step A5, after mixing the terminal double-bond hyperbranched polymer, sodium sulfite and sodium nitrate, heating to 80-90° C., then dropwise adding 0.05-0.08 mol / L sodium bisulfite aqueous solution, maintaining the temperature for reflux reaction for 8-10 hours, filtering, washing and drying to obtain the modified hyperbranched polymer.

2. A high-efficiency low-carbon mud curing agent according to claim 1, characterized in that: The volume ratio of ethanolamine to ethanol in the ethanolamine ethanol solution in step A1 is 1:

4.

3. A high-efficiency low-carbon mud curing agent according to claim 1, characterized in that: In step A2, the usage ratio of toluene-2,5-diisocyanate, sodium hydroxide, toluene and γ-aminopropyltriethoxysilane is 0.015-0.03 mol: 0.01-0.05 g: 25-50 mL: 0.015-0.03 mol.

4. The high-efficiency and low-carbon slurry curing agent according to claim 1, characterized in that: The amount ratio of grafted modified silica, sodium hydroxide, toluene and ethylenediamine in the intermediate product of step A4 is 1-3 g: 0.005-0.03 g: 100 mL: 0.008-0.02 mol.

5. The high-efficiency and low-carbon curing agent for mud according to claim 1, characterized in that: In step A4, the usage ratio of the intermediate product, tetrahydrofuran and trimethylolpropane triacrylate in the terminal double-bond hyperbranched polyester is 1-3 g:100 mL:0.016-0.04 mol.

6. The high-efficiency and low-carbon curing agent for mud according to claim 1, characterized in that: In step A5, the usage ratio of the terminal double-bond hyperbranched polymer, sodium sulfite, sodium nitrate and sodium bisulfite aqueous solution is 1-3 g: 0.003-0.006mol: 0.01-0.03g: 100mL.

7. The high-efficiency and low-carbon curing agent for mud according to claim 1, characterized in that: The industrial waste slag is one or both of blast furnace slag and fly ash.

8. A method for preparing the high-efficiency low-carbon curing agent for mud according to any one of claims 1 to 7, characterized in that: The following steps are involved: Weigh the raw materials by weight, add calcium carbonate, calcium sulfate, sodium silicate, aluminum oxide and industrial waste into a stirrer, stir evenly at a speed of 150-250rpm, then add polyacrylamide, modified hyperbranched polymer and polyacrylate, and stir evenly at a speed of 350-450rpm to obtain a high-efficiency and low-carbon curing agent for mud.

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