Anti-sagging concrete curing material and method for preparing the same

Abstract

The present application relates to a kind of anti-sagging concrete curing material and its preparation method, including the following percentage of raw materials: 40%-50% of "core-shell" structure emulsion;20%-30% of anti-sagging agent;20%-30% of densification agent, "core" in "core-shell" structure has rigidity, can promote film strength, while nano titanium dioxide has anti-ultraviolet performance, can reduce the aging damage of protective film formed by curing agent in high ultraviolet environment, in addition, nano titanium dioxide has photocatalytic performance, under the action of light in curing process, continuously catalyze and initiate the polymerization growth of "shell" in "core-shell" structure, realize the "regeneration" of film, reach long time sustained curing effect.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to an anti-sagging concrete curing material and its preparation method. Background Technology

[0002] Concrete curing is a crucial step in the concrete construction process. After concrete pouring, different curing methods significantly impact the evaporation of moisture from the concrete surface and interior. Traditional methods include watering, covering with mulch, wet burlap sacks, or piling wet sand, which are labor-intensive, resource-intensive, and time-consuming. Furthermore, they are unsuitable for water-scarce regions, or for the construction requirements of high-rise beams and columns, large buildings, and other irregularly shaped structures. Therefore, various curing agents have been developed both domestically and internationally for application or spraying onto the concrete surface. Compared to traditional curing methods, these agents offer advantages such as saving labor, time, and water.

[0003] There are two main types of curing agents: one is inorganic salt-based, which utilizes the silicate in the curing agent to penetrate into the concrete and react chemically with calcium hydroxide in the cement within a 1-3mm penetration layer, generating calcium silicate and hydroxides. The hydroxides can activate the surface of fly ash and sand, accelerating the hydration of calcium silicate and improving the surface performance of the concrete. This is because calcium silicate is insoluble and can seal various pores on the concrete surface, forming a solid film that prevents premature and excessive evaporation of moisture, thus ensuring sufficient cement hydration and achieving the purpose of curing. The other type is organic-based, where a high-molecular-weight organic emulsion is sprayed onto the concrete surface, quickly forming a waterproof film that prevents moisture evaporation and achieves immediate curing. Most of the research focuses on improving the film-forming properties of curing agents and increasing water retention. For example, patent CN201310179692.6 proposes an organic / inorganic composite cement concrete curing agent that can achieve a water retention rate of over 90%. Patent CN202110755202.7 proposes an emulsion-type curing agent that can improve the water retention rate and surface strength of concrete. Patent CN201811483063.1 proposes a biodegradable concrete curing agent that can achieve zero pollution to the environment.

[0004] The above studies have improved the performance of curing agents from different directions. Most of the curing agents are liquids or emulsions, which have good effects when applied in relatively flat construction environments such as highway concrete. However, when sprayed on beams, columns, slopes, and vertical structures, the liquid tends to flow to the bottom and does not drip onto the surface, resulting in uneven distribution of the curing agent on the surface and poor film-forming curing effect. At the same time, most of the curing agent is concentrated at the bottom and cannot exert a curing effect, which also leads to material waste and increased costs. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention is proposed. This invention provides an anti-sagging concrete curing material and its preparation method, solving the technical problem in the prior art where, when spraying curing agents in sloping construction environments, the liquid easily flows to the bottom and does not sag on the surface, resulting in uneven distribution of the curing agent on the surface and the curing agent accumulating at the bottom, thus failing to achieve the desired curing effect.

[0006] According to a first aspect of the present invention, the present invention provides an anti-sagging concrete curing material, comprising the following components in percentage:

[0007] 40%-50% "core-shell" structure emulsion;

[0008] 20%-30% anti-sagging agent;

[0009] 20%-30% Densifying agent.

[0010] Furthermore, the core-shell structure comprises the following components in percentage amounts:

[0011] 5%-10% internal rigid core;

[0012] 10%-20% External flexible shell;

[0013] 20%-40% dispersant;

[0014] 0.5%-1% initiator;

[0015] 20%-30% emulsifier;

[0016] 10%-20% deionized water.

[0017] Furthermore, the internal rigid core comprises any combination of nano-titanium dioxide and fumed silica, nano-calcium carbonate, nano-calcium silicate, sulfonated graphene microspheres, and carbon nanotubes;

[0018] The outer flexible shell is composed of acrylic acid, acrylamide, and N,N-methylenebisacrylamide polymers; the dispersant is a polycarboxylate.

[0019] The initiator is azobisisobutyronitrile, benzoyl peroxide, p-benzoyl peroxide, or persulfate.

[0020] One of ammonium and potassium persulfate;

[0021] The emulsifier is sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, or nonylphenol polyoxyethylene.

[0022] One of the following: ether, polyoxyethylene ether, polyvinyl alcohol, or polyol fatty acid ester;

[0023] Furthermore, the anti-sagging agent comprises the following components in percentage amounts:

[0024] 25%-50% lignin sulfonate;

[0025] 25% cellulose ether;

[0026] 2.5% latex powder;

[0027] 25% polyether polyurethane;

[0028] 5%-30% deionized water.

[0029] Furthermore, the lignin sulfonate is one of sodium lignin sulfonate, potassium lignin sulfonate, and calcium lignin sulfonate;

[0030] Preferably, the lignin sulfonate is potassium lignin sulfonate;

[0031] The cellulose ether is one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and hydroxypropyl methyl cellulose.

[0032] Preferably, the cellulose ether is one of hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose;

[0033] Preferably, the cellulose ether is hydroxypropyl methylcellulose.

[0034] The latex powder is one of the following: vinyl acetate and ethylene copolymer powder, ethylene, vinyl chloride and vinyl silicate terpolymer powder, vinyl acetate, acrylate and higher fatty acid vinyl ester terpolymer powder, and acrylate and styrene copolymer powder.

[0035] Preferably, the latex powder is a terpolymer powder of vinyl acetate, acrylate and higher fatty acid vinyl ester;

[0036] The polyether-type polyurethane is polymerized from one of polypropylene glycol, polyethylene glycol, polytetrahydrofuran glycol, and polybutylene adipate diol with isocyanate;

[0037] Preferably, the polyether-type polyurethane is polymerized from polybutylene adipate diol and isocyanate.

[0038] Furthermore, the fineness of the latex powder is 500-1500 mesh.

[0039] Furthermore, the latex particles in the core-shell structured emulsion have a particle size of 160-220 nm; the compacting agent is one or more of emulsified silicone oil, sodium silicate, sodium silanolate, silica sol, and tetraethyl orthosilicate.

[0040] According to a second aspect of the present invention, the present invention provides a method for preparing an anti-sagging concrete curing material, wherein 40%-50% of a core-shell structure emulsion is added to 20%-30% of an anti-sagging agent, and the mixture is stirred for 30-40 minutes until the anti-sagging agent is uniformly dispersed. Then, 20%-30% of a densifying agent is added, and the mixture is stirred again for 30-40 minutes to obtain the curing material.

[0041] Furthermore, the preparation method of the core-shell structured emulsion includes the following steps:

[0042] S1. Preparation of rigid cores:

[0043] Take 5%-10% rigid core, 20%-40% dispersant, 20%-30% emulsifier, 1%-5% acrylamide, 1%-5% acrylic acid, and 10% deionized water and place them in a four-necked flask. Heat the mixture in a water bath to 60°C and stir for 30 minutes to prepare the base liquid.

[0044] S2, Preparation of Flexible Shell

[0045] Prepare a mixed solution by taking 0.5%-1% of N,N-methylenebisacrylamide, 5%-10% of acrylamide, 1%-5% of N,N-methyleneacrylamide, 0.5%-0.1% of initiator, and 10% of deionized water.

[0046] S3, Preparation of "core-shell" structured emulsions

[0047] The mixed solution prepared by S2 is added dropwise to the base solution prepared by S1 over a period of 1.5-2 hours. After the addition is completed, the solution is kept at 60°C for 1 hour to obtain the core-shell structure emulsion.

[0048] Furthermore, the method for preparing the anti-sagging agent is as follows: take 25%-50% lignin sulfonate, 25% cellulose ether, 2.5% latex powder, and 25% polyether polyurethane, mix them, add 5-30% deionized water, heat to 50°C, and stir for 30 minutes until the solution becomes a uniform viscous liquid to obtain the anti-sagging agent.

[0049] This invention provides an anti-sagging concrete curing material and its preparation method, comprising the following components in percentage: 40%-50% "core-shell" structured emulsion; 20%-30% anti-sagging agent; and 20%-30% densifying agent. The latex particles in the "core-shell" structured emulsion have a particle size distribution concentrated between 160-220 nm, with a narrow distribution width. When the particles are close together, the outer shells tend to adhere to each other to form a film. The "shell" in the "core-shell" structured emulsion has extensibility, which can improve the toughness of the film formation; the "core" in the "core-shell" structure has rigidity, which can improve the strength of the film formation. Simultaneously, nano-titanium dioxide has UV resistance, which can reduce the aging damage of the protective film formed by the curing agent in a high UV environment. Furthermore, nano-titanium dioxide has photocatalytic properties, which can continuously catalyze the polymerization and growth of the "shell" in the "core-shell" structure under light during the curing process, achieving film regeneration and a long-term continuous curing effect. Attached Figure Description

[0050] The above and other objects, features, and advantages of the present invention will become more apparent from the more detailed description of the embodiments of the invention in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same parts or steps.

[0051] Figure 1 This is a TEM image of a core-shell structured emulsion for anti-sagging concrete curing material provided in an embodiment of the present invention. Detailed Implementation

[0052] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is obvious that the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0053] Example 1:

[0054] Step (1) Preparation of "core-shell" structured emulsion

[0055] S1. Preparation of rigid cores:

[0056] Take 5% nano-titanium dioxide, 5% fumed silica, 20% polycarboxylate, 30% sodium dodecylbenzenesulfonate, 5% acrylamide, 3% acrylic acid, and 10% deionized water, heat to 60℃, and stir for 30 min. The acrylamide and acrylic acid components of the flexible shell need to be added to the bottom liquid of the rigid core in advance, which can increase the initial substrate concentration of the flexible shell and improve the grafting polymerization rate. In addition, the pre-addition of part of the flexible shell to the bottom liquid of the rigid core can increase the contact area between the shell and the core and enhance the grafting efficiency.

[0057] S2, Preparation of Flexible Shell

[0058] Prepare a mixed solution by taking 1% N,N methylenebisacrylamide, 5% acrylamide, 2% N,N methyleneacrylamide, 0.5% azobisisobutyronitrile, and 10% deionized water.

[0059] S3, Preparation of "core-shell" structured emulsions

[0060] The mixed solution prepared by S2 was added dropwise to the base solution prepared by S1 over a period of 2 hours. After the addition was completed, the solution was kept at 60°C for 1 hour to obtain the core-shell structure emulsion.

[0061] Step (2) Preparation of anti-sagging agent

[0062] Take 25% sodium lignosulfonate, 25% hydroxypropyl methylcellulose, 2.5% acrylate-styrene copolymer powder, 25% polybutylene adipate diol type polyurethane, add 20% deionized water, heat to 50℃, stir for 30 minutes until the solution is a uniform viscous liquid to obtain the anti-sagging agent.

[0063] Step (3) Preparation of the curing agent

[0064] Add 40% of the "core-shell" structure emulsion prepared in step (1) to the 20% anti-sagging agent prepared in step (2), stir for 30 minutes until the anti-sagging agent is evenly dispersed, then add 20% of emulsified silicone oil and stir for 30 minutes to obtain the curing agent.

[0065] The prepared core-shell emulsion was tested using TEM (Thermo Fisher Scientific-Talos F200x), as shown below. Figure 1 As shown, the particle size distribution of latex particles in the "core-shell" structure emulsion is concentrated in the range of 160-220 nm. The shell in the "core-shell" structure emulsion has extensibility, which can improve the toughness of the film formation; the "core" in the "core-shell" structure has rigidity, which can improve the strength of the film formation. At the same time, nano-titanium dioxide has anti-ultraviolet properties, which can reduce the aging damage of the protective film formed by the curing agent in the high ultraviolet environment. In addition, nano-titanium dioxide has photocatalytic properties, which continuously catalyzes the polymerization and growth of the "shell" in the "core-shell" structure under the action of light during the curing process, realizing the "regeneration" of the film and achieving a long-term continuous curing effect.

[0066] Example 2:

[0067] Step (1) Preparation of "core-shell" structured emulsion

[0068] S1. Preparation of rigid cores:

[0069] Take 5% nano titanium dioxide, 5% fumed silica, 20% polycarboxylate, 20% sodium dodecyl sulfate, 5% acrylamide, 3% acrylic acid, and 10% deionized water, heat to 60°C, and stir for 30 minutes.

[0070] S2, Preparation of Flexible Shell

[0071] Prepare a mixed solution by taking 1% N,N methylenebisacrylamide, 5% acrylamide, 2% N,N methyleneacrylamide, 0.5% azobisisobutyronitrile, and 10% deionized water.

[0072] S3, Preparation of "core-shell" structured emulsions

[0073] The mixed solution prepared by S2 was added dropwise to the base solution prepared by S1 over a period of 2 hours. After the addition was completed, the solution was kept at 60°C for 1 hour to obtain the core-shell structure emulsion.

[0074] Step (2) Preparation of anti-sagging agent

[0075] Take 35% sodium lignosulfonate, 25% hydroxypropyl methylcellulose, 2.5% ethylene, vinyl chloride and vinyl silicate terpolymer powder, 25% polybutylene adipate diol type polyurethane, add 12.5% ​​deionized water, heat to 50℃, stir for 30 minutes until the solution is a uniform viscous liquid to obtain the anti-sagging agent.

[0076] Step (3) Preparation of the curing agent

[0077] Add the 40% core-shell structure emulsion prepared in step (1) to the 20% anti-sagging agent prepared in step (2), stir for 30 minutes until the anti-sagging agent is evenly dispersed, then add 20% emulsified silicone oil and stir for 30 minutes to obtain the curing agent.

[0078] Example 3:

[0079] Step (1) Preparation of "core-shell" structured emulsion

[0080] S1, Preparation of rigid cores

[0081] Take 5% nano titanium dioxide, 5% fumed silica, 5% polycarboxylate, 7% nonylphenol polyoxyethylene ether, 5% acrylamide, 3% acrylic acid and 10% deionized water, heat to 60℃ and stir for 30 min.

[0082] S2, Preparation of Flexible Shell

[0083] Prepare a mixed solution by taking 1% N,N methylenebisacrylamide, 5% acrylamide, 2% N,N methylenebisacrylamide, 0.5% azobisisobutyronitrile, and 10% deionized water.

[0084] S3, Preparation of "core-shell" structured emulsions

[0085] The mixed solution prepared by S2 was added dropwise to the base solution prepared by S1 over a period of 2 hours. After the addition was completed, the solution was kept at 60°C for 1 hour to obtain the core-shell structure emulsion.

[0086] Step (2) Preparation of the curing agent

[0087] After stirring the 40% "core-shell" structure emulsion prepared in step (1) for 30 minutes until it is evenly dispersed, add 20% emulsified silicone oil and stir for 30 minutes to obtain the curing agent.

[0088] Example 4:

[0089] Step (1) Preparation of "core-shell" structured emulsion

[0090] S1, Preparation of rigid cores

[0091] Take 5% nano titanium dioxide, 5% nano calcium carbonate, 5% polycarboxylate, 7% nonylphenol polyoxyethylene ether, 5% acrylamide, 3% acrylic acid and 10% deionized water, heat to 60℃ and stir for 30 min.

[0092] S2, Preparation of Flexible Shell

[0093] Prepare a mixed solution by taking 1% N,N-methylenebisacrylamide, 5% acrylamide, 2% N,N-methylenebisacrylamide, 0.5% azobisisobutyronitrile, and 10% deionized water.

[0094] S3, Preparation of "core-shell" structured emulsions

[0095] The mixed solution prepared by S2 was added dropwise to the base solution prepared by S1 over a period of 2 hours. After the addition was completed, the solution was kept at 60°C for 1 hour to obtain the core-shell structure emulsion.

[0096] Step (2) Preparation of anti-sagging agent

[0097] Take 35% potassium lignosulfonate, 25% hydroxypropyl methylcellulose, 2.5% vinyl acetate, acrylate and higher fatty acid vinyl ester terpolymer powder, 25% polybutylene adipate diol type polyurethane, add 12.5% ​​deionized water, heat to 50℃, stir for 30 minutes until the solution is a uniform viscous liquid to obtain the anti-sagging agent.

[0098] Step (3) Preparation of the curing agent

[0099] Add the 40% core-shell structure emulsion prepared in step (1) to the 20% anti-sagging agent prepared in step (2), stir for 30 minutes until the anti-sagging agent is evenly dispersed, then add 20% emulsified silicone oil and stir for 30 minutes to obtain the curing agent.

[0100] Example 5:

[0101] Step (1) Preparation of "core-shell" structured emulsion

[0102] S1, Preparation of rigid cores

[0103] Take 5% nano titanium dioxide, 5% fumed silica, 5% polycarboxylate, 10% nonylphenol polyoxyethylene ether, 5% acrylamide, 3% acrylic acid and 10% deionized water, heat to 60℃ and stir for 30 min.

[0104] S2, Preparation of Flexible Shell

[0105] Prepare a mixed solution by taking 1% N,N methylenebisacrylamide, 5% acrylamide, 2% N,N methylenebisacrylamide, 0.5% azobisisobutyronitrile, and 10% deionized water.

[0106] S3, Preparation of "core-shell" structured emulsions

[0107] The mixed solution prepared by S2 was added dropwise to the base solution prepared by S1 over a period of 2 hours. After the addition was completed, the solution was kept at 60°C for 1 hour to obtain the core-shell structure emulsion.

[0108] Step (2) Preparation of anti-sagging agent

[0109] Take 40% potassium lignosulfonate, 25% hydroxyethyl cellulose, 2.5% vinyl acetate, acrylate and higher fatty acid vinyl ester terpolymer powder, 25% polybutylene adipate diol type polyurethane, add 7.5% deionized water, heat to 60℃, stir for 30 minutes until the solution is a uniform viscous liquid to obtain the anti-sagging agent.

[0110] Step (3) Preparation of the curing agent

[0111] Add the 40% core-shell structure emulsion prepared in step (1) to the 20% anti-sagging agent prepared in step (2), stir for 30 minutes until the anti-sagging agent is evenly dispersed, then add 20% emulsified silicone oil and stir for 30 minutes to obtain the curing agent.

[0112] Example 6:

[0113] Step (1) Preparation of "core-shell" structured emulsion

[0114] S1, Preparation of rigid cores

[0115] Take 5% nano titanium dioxide, 5% fumed silica, 5% polycarboxylate, 10% nonylphenol polyoxyethylene ether, 5% acrylamide, 3% acrylic acid and 10% deionized water, heat to 60℃ and stir for 30 min.

[0116] S2, Preparation of Flexible Shell

[0117] Prepare a mixed solution by taking 1% N,N methylenebisacrylamide, 5% acrylamide, 2% N,N methylenebisacrylamide, 0.5% azobisisobutyronitrile, and 10% deionized water.

[0118] S3, Preparation of "core-shell" structured emulsions

[0119] The mixed solution prepared by S2 was added dropwise to the base solution prepared by S1 over a period of 2 hours. After the addition was completed, the solution was kept at 60°C for 1 hour to obtain the core-shell structure emulsion.

[0120] Step (2) Preparation of anti-sagging agent

[0121] Take 30% potassium lignosulfonate, 25% hydroxypropyl methylcellulose, 2.5% vinyl acetate, acrylate and higher fatty acid vinyl ester terpolymer powder, 25% polybutylene adipate diol type polyurethane, add 17.5% deionized water, heat to 50℃, stir for 30 minutes until the solution is a uniform viscous liquid to obtain the anti-sagging agent.

[0122] Step (3) Preparation of the curing agent

[0123] Add 40% of the "core-shell" structure emulsion to 20% of the anti-sagging agent, stir for 30 minutes until the anti-sagging agent is evenly dispersed, then add 10% emulsified silicone oil and 5% silica sol, stir for 60 minutes to obtain the curing agent.

[0124] Comparative Example

[0125] Comparative tests were conducted between the commercially available ER-type curing agent (Changsha Fangyijian Co., Ltd.) and the sample from the example. C30 concrete was prepared according to the proportions in Table 1, and 0.5 kg / m² of ER-type curing agent was added to the prepared C30 concrete.

[0126] Table 1. C30 Concrete Mix Proportion (kg)

[0127]

[0128] The curing agents prepared in Examples 1-6 were added to the prepared C30 concrete for sag testing. The anti-sag properties of the curing agents were tested according to GB9264-88 "Test Method for Relative Sag of Paints", the sealing properties and water solubility of the curing agents were tested according to JT / T 522-2004 "Curing Agents for Highway Engineering Concrete", and the mechanical and durability properties were tested according to GB / T50081—2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" and GB / T50082—2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete". The test results are shown in Table 2. Compared with commercially available curing agents (ER type curing agents), the curing materials in Examples 1-6 showed no or almost no sag. The anti-sag agent in the curing materials of Examples 4-6 used a terpolymer powder of vinyl acetate, acrylate, and higher fatty acid vinyl ester, which had better cohesiveness than Examples 1-3, thus exhibiting better anti-sag and leveling properties. Among them, the maintenance material prepared in Example 5 with the ratio of potassium lignosulfonate: hydroxyethyl cellulose: vinyl acetate to acrylate and higher fatty acid vinyl ester terpolymer powder of potassium lignosulfonate: hydroxyethyl cellulose: vinyl acetate to acrylate and higher fatty acid vinyl ester terpolymer powder of 16:10:1 has the best overall performance.

[0129] Table 2. Sagging Performance Test of Curing Materials

[0130]

[0131] As shown in Table 3, the water solubility, film formation state after immersion, and adhesion to the concrete surface of Examples 1-6 are all superior to those of the comparative examples.

[0132] Table 3 Film-forming performance test of curing materials

[0133]

[0134] As shown in Table 4, the rebound strength results show that Examples 1-6 can significantly improve the surface strength of concrete compared to the comparative examples, especially after 28 days. Since the rigid core component has a surface strengthening effect, it can continuously enhance cement hydration and improve concrete strength. It can ensure that the curing agent is evenly distributed on the surface of beams, columns, slopes, and vertical structures, resulting in good film-forming curing effect without wasting materials.

[0135] Table 4 Concrete Rebound Strength Test

[0136]

[0137] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications or equivalent substitutions made within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A type of anti-sagging concrete curing material, characterized in that, Components including the following percentages: 40%-50% "core-shell" structure emulsion; 20%-30% anti-sagging agent; 20%-30% densifier; The core-shell emulsion comprises the following components in percentage: 5%-10% internal rigid core; 10%-20% External flexible shell; 20%-40% dispersant; 0.5%-1% initiator; 20%-30% emulsifier; 10%-20% deionized water; The internal rigid core comprises any combination of nano-titanium dioxide and fumed silica, nano-calcium carbonate, nano-calcium silicate, sulfonated graphene microspheres, and carbon nanotubes. The outer flexible shell is composed of acrylic acid, acrylamide, and N,N-methylenebisacrylamide polymers; The anti-sagging agent comprises the following components in percentage: 25%-50% lignin sulfonate; 25% cellulose ether; 2.5% latex powder; 25% polyether polyurethane; 5%-30% deionized water.

2. The anti-sagging concrete curing material according to claim 1, characterized in that, The dispersant is a polycarboxylate; The initiator is azobisisobutyronitrile, benzoyl peroxide, p-benzoyl peroxide, or persulfate. One of ammonium and potassium persulfate; The emulsifier is sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, or nonylphenol polyoxyethylene. One of the following: ether, polyoxyethylene ether, polyvinyl alcohol, or polyol fatty acid ester.

3. The anti-sagging concrete curing material according to claim 1, characterized in that, The lignin sulfonate is one of sodium lignin sulfonate, potassium lignin sulfonate, and calcium lignin sulfonate. The cellulose ether is one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and hydroxypropyl methyl cellulose; The latex powder is one of the following: vinyl acetate and ethylene copolymer powder, ethylene, vinyl chloride and vinyl silicate terpolymer powder, vinyl acetate, acrylate and higher fatty acid vinyl ester terpolymer powder, and acrylate and styrene copolymer powder. The polyether-type polyurethane is polymerized from one of polypropylene glycol, polyethylene glycol, polytetrahydrofuran glycol, and polybutylene adipate diol with isocyanate.

4. The anti-sagging concrete curing material according to claim 3, characterized in that, The fineness of the latex powder is 500-1500 mesh.

5. The anti-sagging concrete curing material according to claim 1, characterized in that, The latex particles in the core-shell emulsion have a particle size of 160-220 nm; the compacting agent is one or more of emulsified silicone oil, sodium silicate, sodium silanolate, silica sol, and tetraethyl orthosilicate.

6. A method for preparing an anti-sagging concrete curing material as described in any one of claims 1-5, characterized in that, Add 40%-50% of the "core-shell" structured emulsion to 20%-30% of the anti-sagging agent, stir for 30-40 minutes until the anti-sagging agent is evenly dispersed, then add 20%-30% of the densifying agent, and stir again for 30-40 minutes to obtain the curing material.

7. The method for preparing an anti-sagging concrete curing material according to claim 6, characterized in that, The preparation method of the "core-shell" structured emulsion includes the following steps: S1. Preparation of rigid cores: Take 5%-10% rigid core, 20%-40% dispersant, 20%-30% emulsifier, 1%-5% acrylamide, 1%-5% acrylic acid, and 10% deionized water and place them in a four-necked flask. Heat the mixture in a water bath to 60°C and stir for 30 minutes to prepare the base liquid. S2, Preparation of Flexible Shell Prepare a mixed solution by taking 0.5%-1% of N,N-methylenebisacrylamide, 5%-10% of acrylamide, 1%-5% of N,N-methyleneacrylamide, 0.5%-0.1% of initiator, and 10% of deionized water. S3, Preparation of "core-shell" structured emulsions The mixed solution prepared by S2 is added dropwise to the base solution prepared by S1 over a period of 1.5-2 hours. After the addition is completed, the solution is kept at 60°C for 1 hour to obtain the "core-shell" structured emulsion.

8. The method for preparing an anti-sagging concrete curing material according to claim 6, characterized in that, The method for preparing the anti-sagging agent is as follows: take 25%-50% lignin sulfonate, 25% cellulose ether, 2.5% latex powder, and 25% polyether polyurethane, mix them, add 20% deionized water, heat to 50°C, and stir for 30 minutes until the solution becomes a uniform viscous liquid to obtain the anti-sagging agent.

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