Early-strength high-stability alkali-free accelerator and preparation method thereof

Abstract

The application relates to the technical field of concrete admixtures, and discloses an early-strength high-stability alkali-free accelerator and a preparation method thereof. The early-strength high-stability alkali-free accelerator is prepared from the following components in percentage by weight: aluminum sulfate 40-60%, aluminum tartrate solution 10-20%, alcohol amine compound 4-15%, 1,2-propylene glycol 5-10%, pH regulator 1.0-5.0%, magnesium sulfate 6-10%, stabilizer 1.0-1.5%, and water 3-8.5%. The raw material of the stabilizer comprises a sulfonic acid compound, and the sulfonic acid compound comprises one or more of 4-hydroxybenzenesulfonic acid, aniline-2,4-disulfonic acid and 2-acrylamido-2-methylpropanesulfonic acid. The above technical scheme solves the problem of relatively poor stability of the alkali-free accelerator in the related art.

Description

Technical Field

[0001] This invention relates to the field of concrete admixtures, specifically to an early-strength, highly stable, alkali-free quick-setting agent and its preparation method. Background Technology

[0002] Shotcrete is a core material in geotechnical engineering and concrete emergency repair projects such as tunnels, slope reinforcement, and foundation pit support. Alkali-free quick-setting agents are its key admixtures. Due to their alkali-free properties, they can effectively avoid alkali-aggregate reaction, reduce concrete strength loss, and have low corrosivity to construction equipment, so their application is becoming increasingly widespread.

[0003] Most alkali-free quick-setting agents currently on the market use aluminum sulfate as the core accelerator. Although they can meet the basic requirements for quick setting and early strength, they generally suffer from poor stability. The aluminum ions in the alkali-free quick-setting agent system are amphoteric ions, which are very easy to undergo hydrolysis in aqueous solution to generate amorphous aluminum hydroxide gel. This gel has a relatively large specific surface area and is easy to adsorb adjacent gel particles to undergo self-polymerization reaction, forming a large number of aluminum hydroxide gel groups. This leads to problems such as stratification, crystallization, and precipitation in the storage and transportation of alkali-free quick-setting agents. This not only reduces the efficiency of the quick-setting agent, but also causes inaccurate measurement, affecting the construction quality and homogeneity of shotcrete.

[0004] Therefore, developing an alkali-free quick-setting agent that improves the stability of the alkali-free quick-setting agent without affecting its other properties is of great significance for meeting people's demand for alkali-free quick-setting agents. Summary of the Invention

[0005] This invention proposes an early-strength, high-stability alkali-free quick-setting agent and its preparation method, which solves the problem of relatively poor stability of alkali-free quick-setting agents in related technologies.

[0006] The technical solution of the present invention is as follows:

[0007] This invention proposes an early-strength, high-stability, alkali-free quick-setting agent, the raw materials of which are composed of the following components by weight percentage:

[0008] Aluminum sulfate 40%~60%, aluminum tartrate solution 10%~20%, alkanolamines 4%~15%, 1,2-propanediol 5%~10%, pH adjuster 1.0%~5.0%, magnesium sulfate 6%~10%, stabilizer 1.0%~1.5%, water 3%~8.5%;

[0009] The stabilizer's raw materials include sulfonic acid compounds, which include one or more of 4-hydroxybenzenesulfonic acid, aniline-2,4-disulfonic acid, and 2-acrylamido-2-methylpropanesulfonic acid.

[0010] In this invention, aluminum sulfate is specifically aluminum sulfate octadecahydrate. During the preparation of the alkali-free quick-setting agent, the water of crystallization in aluminum sulfate octadecahydrate will dissolve and be released, becoming free water in the system and participating in the subsequent preparation of the alkali-free quick-setting agent.

[0011] As a further technical solution, when the sulfonic acid compound is 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid, the weight ratio of 4-hydroxybenzenesulfonic acid to aniline-2,4-disulfonic acid is 2~3:1.

[0012] In this invention, when the sulfonic acid compounds are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid, the stability of the alkali-free quick-setting agent is better. The reason for this is speculated to be that, compared with 2-acrylamido-2-methylpropanesulfonic acid, 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid have less steric hindrance in their structures, making them more likely to interact with aluminum-containing groups. Furthermore, the hydroxyl group in 4-hydroxybenzenesulfonic acid and the amino group in aniline-2,4-disulfonic acid can improve the coordination ability of the sulfonic acid groups to a certain extent. By using 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid synergistically, and by adjusting the content ratio of 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid to 2~3:1, the stability of the alkali-free quick-setting agent can be further improved.

[0013] As a further technical solution, the raw materials of the stabilizer also include inorganic powder, which includes attapulgite and wollastonite powder in a weight ratio of 1.5 to 4:1.

[0014] In this invention, when the raw materials of the stabilizer also include inorganic powder formed from attapulgite and wollastonite powder, the inorganic powder pretreated with sulfonic acid compounds is added as a stabilizer to the alkali-free quick-setting agent. Without affecting the stability of the alkali-free quick-setting agent, the inorganic powder can also better refine the pore structure of the cement slurry containing the alkali-free quick-setting agent, improve the density of the slurry, and thus improve the compressive strength of the cement slurry containing the alkali-free quick-setting agent, so that the 1-day compressive strength is increased to more than 12.3 MPa, the 28-day compressive strength ratio is increased to 117%, and the 90-day compressive strength retention rate is increased to more than 118%.

[0015] As a further technical solution, the weight ratio of the inorganic powder to the sulfonic acid compound is 1~2:4.

[0016] As a further technical solution, the method for preparing the stabilizer includes the following steps:

[0017] A1. The attapulgite clay and the wollastonite powder are mixed and ground to obtain a blend.

[0018] A2. Dissolve the sulfonic acid compound in ethanol, add the blend, mix well, and dry to obtain the stabilizer.

[0019] As a further technical solution, the average particle size of the wollastonite powder is 2~8μm, and the average particle size of the attapulgite clay is 30~50μm.

[0020] As a further technical solution, in step A1, the grinding speed is 300~400 r / min and the grinding time is 15~25 min.

[0021] As a further technical solution, the alkanolamine compound includes one or more of ethanolamine, diethanolamine, monoisopropanolamine, and triisopropanolamine, preferably ethanolamine.

[0022] As a further technical solution, the pH adjuster includes one or more of lactic acid, citric acid, and malic acid, preferably lactic acid.

[0023] As a further technical solution, the preparation method of the aluminum tartrate solution includes the following steps:

[0024] B1. Mix tartaric acid solution and aluminum chloride solution, react, and obtain a blended solution;

[0025] B2. Add sodium aluminate solution to the blend, react, adjust the pH to 6.0~7.0, filter, and obtain the aluminum tartrate solution.

[0026] As a further technical solution, in step B1, the reaction temperature is 100~110℃ and the reaction time is 2~3h.

[0027] In step B2, the reaction is carried out at a temperature of 110~115℃ for 3~4 hours.

[0028] As a further technical solution, the weight ratio of the total amount of aluminum ions in the aluminum chloride solution and the sodium aluminate solution to the weight ratio of tartrate ions in the tartaric acid solution is 1.5~2.5:1; the weight ratio of aluminum chloride in the aluminum chloride solution to sodium aluminate in the sodium aluminate solution is 11:1.

[0029] This invention proposes a method for preparing an early-strength, high-stability, alkali-free quick-setting agent, comprising the following steps:

[0030] S1. After mixing the aluminum sulfate and water, add the aluminum tartrate solution and mix to obtain mixture I;

[0031] S2. Add the alkanolamine compound and the 1,2-propanediol to mixture I, mix, and obtain mixture II;

[0032] S3. Add the stabilizer and magnesium sulfate to mixture II, mix, and obtain mixture III;

[0033] S4. Add the pH adjuster to the mixture III and mix to obtain the early-strength, high-stability, alkali-free quick-setting agent.

[0034] As a further technical solution, in step S1, the mixing temperature is 60~80℃, the stirring speed is 400~500r / min, and the time is 30~60min;

[0035] In step S2, the mixing temperature is 60~80℃, the stirring speed is 400~500r / min, and the time is 10~20min.

[0036] In step S3, the mixing temperature is 70~90℃, the stirring speed is 300~400r / min, and the time is 30~60min.

[0037] In step S4, the mixing temperature is 40~60℃, the stirring speed is 300~400r / min, and the time is 30~60min.

[0038] The working principle and beneficial effects of this invention are as follows:

[0039] In this invention, the early-strength, high-stability alkali-free quick-setting agent uses aluminum sulfate and aluminum tartrate as the main quick-setting components, and adds sulfonic acid compound stabilizers to effectively improve the stability of the alkali-free quick-setting agent. Specifically:

[0040] In alkali-free accelerators with aluminum sulfate and aluminum tartrate as the main accelerators, aluminum ions play a major role in accelerating the setting process. Because aluminum ions are amphoteric, they readily hydrolyze in aqueous solutions, forming easily adsorbed and precipitated amorphous aluminum hydroxide gel. The sulfonic acid groups in the sulfonic acid compound stabilizer of this invention provide relatively good hydrophilicity, improving the dispersibility of aluminum-containing groups in the system in aqueous solutions. Simultaneously, the sulfonic acid groups have a relatively high charge density and strong polarity, enabling them to form certain coordination complexes with aluminum-containing groups in the system. This reduces the activity of metal ions to a certain extent, inhibiting further hydrolysis in aqueous solutions, while preventing the complexes from agglomerating on the cement particle surface due to strong coordination, thus affecting later-stage strength. Therefore, adding a stabilizer including sulfonic acid compounds to the alkali-free accelerator can reduce metal ion activity without affecting later-stage strength, thereby reducing the aggregation and precipitation of aluminum-containing groups and ultimately improving the stability of the alkali-free accelerator. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] In the following examples and comparative examples, the aluminum tartrate solution was a self-made aluminum tartrate solution, and the preparation method included the following steps:

[0043] Tartaric acid solution and aluminum chloride solution were mixed and added to a three-necked flask equipped with an electric stirrer and a spherical condenser. The mixture was heated to 105°C and reacted at 105°C for 2.5 hours to obtain a blend. Sodium aluminate solution was added to the blend, and the mixture was refluxed at 105°C for another 4 hours, gradually producing a white slurry. After the reaction solution became a paste, heating was stopped, and the mixture was slowly cooled. When the temperature reached 60°C, the pH was adjusted to 6.5, and the insoluble matter was removed by filtration to obtain aluminum tartrate solution. The weight ratio of the total aluminum ions in the aluminum chloride solution and sodium aluminate solution to the tartrate ions in the tartaric acid solution was 2:1; the weight ratio of aluminum chloride in the aluminum chloride solution to sodium aluminate in the sodium aluminate solution was 11:1; and the mass fraction of aluminum tartrate in the aluminum tartrate solution was 30%.

[0044] The average particle size of wollastonite powder is 5 μm, and the average particle size of attapulgite is 44 μm.

[0045] Aluminum sulfate, specifically aluminum sulfate octahydrate;

[0046] Magnesium sulfate, specifically anhydrous magnesium sulfate.

[0047] Example 1

[0048] An early-strength, high-stability, alkali-free quick-setting agent, the raw materials of which are composed of the following components by weight percentage:

[0049] The formula consists of: 40% aluminum sulfate octahydrate, 20% aluminum tartrate solution, 15% ethanolamine, 10% 1,2-propanediol, 5.0% lactic acid, 6% anhydrous magnesium sulfate, 1.0% stabilizer, and 3% water.

[0050] The raw material for the stabilizer is 4-hydroxybenzenesulfonic acid;

[0051] The preparation method of an early-strength, high-stability, alkali-free quick-setting agent includes the following steps:

[0052] S1. Add the mixture of aluminum sulfate octadechydrate and water to the reactor, add the prepared aluminum tartrate solution to the reactor, and heat and stir at 60°C with a stirring speed of 400 r / min for 60 min to obtain mixture I;

[0053] S2. Add ethanolamine and 1,2-propanediol to the above mixture I, and heat and stir at 60°C with a stirring speed of 400 r / min for 20 min to obtain mixture II;

[0054] S3. Add stabilizer and anhydrous magnesium sulfate to the above mixture II, heat to 70°C, and heat and stir at 300 r / min for 60 min at 70°C to obtain mixture III;

[0055] S4. Add lactic acid to the above mixture III, cool to 40°C, heat and stir at 300 r / min for 60 min at 40°C, and cool to 25°C to obtain an early-strength, high-stability, alkali-free quick-setting agent.

[0056] Example 2

[0057] An early-strength, high-stability, alkali-free quick-setting agent, the raw materials of which are composed of the following components by weight percentage:

[0058] The formula consists of 50% aluminum sulfate octadechydrate, 15% aluminum tartrate solution, 10% ethanolamine, 8% 1,2-propanediol, 3.0% lactic acid, 8% anhydrous magnesium sulfate, 1.0% stabilizer, and 5% water.

[0059] The raw material for the stabilizer is 2-acrylamido-2-methylpropanesulfonic acid;

[0060] The preparation method of an early-strength, high-stability, alkali-free quick-setting agent includes the following steps:

[0061] S1. Add the mixture of aluminum sulfate octadechydrate and water to the reactor, add the prepared aluminum tartrate solution to the reactor, and heat and stir at 70°C with a stirring speed of 450 r / min for 45 min to obtain mixture I;

[0062] S2. Add ethanolamine and 1,2-propanediol to the above mixture I, and heat and stir at 70°C with a stirring speed of 450 r / min for 15 min to obtain mixture II;

[0063] S3. Add stabilizer and anhydrous magnesium sulfate to the above mixture II, heat to 80°C, and heat and stir at 350 r / min for 45 min at 80°C to obtain mixture III;

[0064] S4. Add lactic acid to the above mixture III, cool to 50°C, heat and stir at 350 r / min for 45 min at 50°C, and cool to 25°C to obtain an early-strength, high-stability, alkali-free quick-setting agent.

[0065] Example 3

[0066] An early-strength, high-stability, alkali-free quick-setting agent, the raw materials of which are composed of the following components by weight percentage:

[0067] The mixture consists of 60% aluminum sulfate octahydrate, 10% aluminum tartrate solution, 4% ethanolamine, 5% 1,2-propanediol, 1.0% lactic acid, 10% anhydrous magnesium sulfate, 1.5% stabilizer, and 8.5% water.

[0068] The raw material for the stabilizer is aniline-2,4-disulfonic acid;

[0069] The preparation method of an early-strength, high-stability, alkali-free quick-setting agent includes the following steps:

[0070] S1. Add the mixture of aluminum sulfate octadechydrate and water to the reactor, add the prepared aluminum tartrate solution to the reactor, and heat and stir at 80°C with a stirring speed of 500 r / min for 30 min to obtain mixture I;

[0071] S2. Add the ethanolamine and 1,2-propanediol to the above mixture I, and heat and stir at 80°C with a stirring speed of 500 r / min for 10 min to obtain mixture II;

[0072] S3. Add stabilizer and anhydrous magnesium sulfate to the above mixture II, heat to 90°C, and heat and stir at 400 r / min for 30 min at 90°C to obtain mixture III;

[0073] S4. Add lactic acid to the above mixture III, cool to 60°C, heat and stir at 400 r / min for 30 min at 60°C, and cool to 25°C to obtain an early-strength, high-stability, alkali-free quick-setting agent.

[0074] Example 4

[0075] The only difference between this embodiment and Embodiment 3 is that, in this embodiment, the raw materials for the stabilizer are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 1:1.

[0076] Example 5

[0077] The only difference between this embodiment and Embodiment 3 is that, in this embodiment, the raw materials for the stabilizer are 4-hydroxybenzenesulfonic acid and 2-acrylamido-2-methylpropanesulfonic acid in a weight ratio of 1:1.

[0078] Example 6

[0079] The only difference between this embodiment and Example 4 is that in this embodiment, the raw materials for the stabilizer are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 4:1.

[0080] Example 7

[0081] The only difference between this embodiment and Example 4 is that in this embodiment, the raw materials for the stabilizer are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 2:1.

[0082] Example 8

[0083] The only difference between this embodiment and Example 4 is that in this embodiment, the raw materials for the stabilizer are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 3:1.

[0084] Example 9

[0085] The only difference between this embodiment and Embodiment 8 is that, in this embodiment, the preparation method of the stabilizer includes the following steps:

[0086] Sulfonic acid compounds are dissolved in ethanol, attapulgite is added, mixed evenly, and dried to obtain a stabilizer. The weight ratio of attapulgite to sulfonic acid compounds is 1:4, the sulfonic acid compounds are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 3:1, and the amount of ethanol added is 5 times the weight of sulfonic acid compounds.

[0087] Example 10

[0088] The only difference between this embodiment and Embodiment 8 is that, in this embodiment, the preparation method of the stabilizer includes the following steps:

[0089] Sulfonic acid compounds are dissolved in ethanol, wollastonite powder is added, mixed evenly, and dried to obtain a stabilizer. The weight ratio of wollastonite powder to sulfonic acid compounds is 1:4, the sulfonic acid compounds are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 3:1, and the amount of ethanol added is 5 times the weight of sulfonic acid compounds.

[0090] Example 11

[0091] The only difference between this embodiment and Embodiment 8 is that, in this embodiment, the preparation method of the stabilizer includes the following steps:

[0092] A1. Attachment clay and wollastonite powder with a weight ratio of 1.5:1 are mixed and ground at 350 r / min for 20 min to obtain a blend.

[0093] A2. Dissolve the sulfonic acid compound in ethanol, add the above blend, mix well, and dry to obtain the stabilizer;

[0094] The weight ratio of attapulgite and wollastonite powder to sulfonic acid compounds is 1:4, and the sulfonic acid compounds are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 3:1; the amount of ethanol added is 5 times the weight of the sulfonic acid compounds.

[0095] Example 12

[0096] The only difference between this embodiment and Embodiment 8 is that, in this embodiment, the preparation method of the stabilizer includes the following steps:

[0097] A1. Attachment clay and wollastonite powder in a weight ratio of 4:1 are mixed and ground at 350 r / min for 20 min to obtain a blend.

[0098] A2. Dissolve the sulfonic acid compound in ethanol, add the above blend, mix well, and dry to obtain the stabilizer;

[0099] The weight ratio of attapulgite and wollastonite powder to sulfonic acid compounds is 1:4, and the sulfonic acid compounds are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 3:1; the amount of ethanol added is 5 times the weight of the sulfonic acid compounds.

[0100] Example 13

[0101] The only difference between this embodiment and Embodiment 8 is that, in this embodiment, the preparation method of the stabilizer includes the following steps:

[0102] A1. Attachment clay and wollastonite powder in a weight ratio of 4:1 are mixed and ground at 350 r / min for 20 min to obtain a blend.

[0103] A2. Dissolve the sulfonic acid compound in ethanol, add the above blend, mix well, and dry to obtain the stabilizer;

[0104] The weight ratio of attapulgite and wollastonite powder to sulfonic acid compounds is 1:2, and the sulfonic acid compounds are 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid in a weight ratio of 3:1; the amount of ethanol added is 5 times the weight of the sulfonic acid compounds.

[0105] Comparative Example 1

[0106] The only difference between this comparative example and Example 1 is that, in this comparative example, 4-hydroxybenzenesulfonic acid in the stabilizer is replaced with an equal amount of 2,4-dihydroxybenzoic acid.

[0107] Comparative Example 2

[0108] The only difference between this comparative example and Example 1 is that no stabilizer was added in this comparative example.

[0109] Experimental Example 1

[0110] The alkali-free quick-setting agents prepared in Examples 1-13 and Comparative Examples 1-2 were tested for stability according to the method in GB / T 35159-2017 "Quick-setting Agents for Shotcrete". The standing time was 28 days. The test results are shown in Table 1.

[0111] Table 1. Stability test results of Examples 1-13 and Comparative Examples 1-2

[0112]

[0113] Compared with Comparative Examples 1-2, when the alkali-free quick-setting agents prepared in Examples 1-13 were subjected to stability tests, the volume of the bottom precipitate decreased significantly after standing for 28 days. This indicates that adding sulfonic acid compounds as stabilizers to the alkali-free quick-setting agents can effectively improve the stability of the alkali-free quick-setting agents when the sulfonic acid compounds include one or more of 4-hydroxybenzenesulfonic acid, aniline-2,4-disulfonic acid, and 2-acrylamido-2-methylpropanesulfonic acid.

[0114] Experiment Example 2

[0115] The alkali-free quick-setting agents prepared in Examples 8-13 were added to cement mortar. The compressive strength of the mortar was tested at 1 day, 28 days, and 90 days according to the method in GB / T 35159-2017 "Quick-setting Agents for Shotcrete". The 28-day compressive strength ratio and 90-day compressive strength retention rate were calculated. The standard mortar mix ratio was: 900g standard cement, 1350g standard sand, and 450g water. The tested mortar mix ratio was: 900g standard cement, 1350g standard sand, and 450g water (including water from the alkali-free quick-setting agent). The dosage of the alkali-free quick-setting agent was 6% of the mortar weight. The test results are shown in Table 2.

[0116] Table 2. Mortar strength test results for Examples 8-13

[0117]

[0118] Compared with Examples 8-10, when the alkali-free quick-setting agent prepared in Examples 11-13 was added to cement mortar, the 28-day compressive strength ratio (28-day compressive strength ratio = 28-day compressive strength of the tested mortar / 28-day compressive strength of the reference mortar × 100%) was improved, and the 90-day compressive strength retention rate (90-day compressive strength retention rate = 90-day compressive strength of the tested mortar / 28-day compressive strength of the reference mortar × 100%) was also improved. This indicates that when the raw materials of the stabilizer also include attapulgite and wollastonite powder, adding sulfonic acid compounds, attapulgite, and wollastonite powder together as stabilizers to the alkali-free quick-setting agent can improve the early and late compressive strength of the mortar containing this alkali-free quick-setting agent without affecting its stability. This results in a 1-day compressive strength increase of over 12.3 MPa, a 28-day compressive strength ratio increase of 117%, and a 90-day compressive strength retention rate increase of over 118%.

[0119] Experimental Example 3

[0120] The alkali-free quick-setting agent prepared in Example 3 was subjected to the following performance tests according to the method in GB / T 35159-2017 "Quick-setting Agents for Shotcrete". The test results are shown in Table 3.

[0121] Table 3 Performance test results of Example 3

[0122]

[0123] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An early-strength, high-stability, alkali-free quick-setting agent, characterized in that, The raw material consists of the following components by weight percentage: Aluminum sulfate 40%~60%, aluminum tartrate solution 10%~20%, alkanolamines 4%~15%, 1,2-propanediol 5%~10%, pH adjuster 1.0%~5.0%, magnesium sulfate 6%~10%, stabilizer 1.0%~1.5%, water 3%~8.5%; The stabilizer's raw materials include sulfonic acid compounds, including 4-hydroxybenzenesulfonic acid and aniline-2,4-disulfonic acid; The raw materials for the stabilizer also include inorganic powder, which includes attapulgite and wollastonite powder in a weight ratio of 1.5 to 4:

1. The weight ratio of the 4-hydroxybenzenesulfonic acid to the aniline-2,4-disulfonic acid is 2~3:1; The weight ratio of the inorganic powder to the sulfonic acid compound is 1~2:4; The method for preparing the stabilizer includes the following steps: A1. The attapulgite clay and the wollastonite powder are mixed and ground to obtain a blend. A2. Dissolve the sulfonic acid compound in ethanol, add the blend, mix well, and dry to obtain the stabilizer.

2. The early-strength, high-stability, alkali-free quick-setting agent according to claim 1, characterized in that, The average particle size of the wollastonite powder is 2~8μm, and the average particle size of the attapulgite clay is 30~50μm.

3. The early-strength, high-stability, alkali-free quick-setting agent according to claim 1, characterized in that, The alkanolamine compounds include one or more of ethanolamine, diethanolamine, monoisopropanolamine, and triisopropanolamine.

4. The early-strength, high-stability, alkali-free quick-setting agent according to claim 1, characterized in that, The pH adjuster includes one or more of lactic acid, citric acid, and malic acid.

5. A method for preparing an early-strength, high-stability, alkali-free quick-setting agent, used to prepare the early-strength, high-stability, alkali-free quick-setting agent as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. After mixing the aluminum sulfate and water, add the aluminum tartrate solution and mix to obtain mixture I; S2. Add the alkanolamine compound and the 1,2-propanediol to mixture I, mix, and obtain mixture II; S3. Add the stabilizer and magnesium sulfate to mixture II, mix, and obtain mixture III; S4. Add the pH adjuster to the mixture III and mix to obtain the early-strength, high-stability, alkali-free quick-setting agent.

6. The preparation method of an early-strength, high-stability, alkali-free quick-setting agent according to claim 5, characterized in that, In step S1, the mixing temperature is 60~80℃, the stirring speed is 400~500r / min, and the time is 30~60min. In step S2, the mixing temperature is 60~80℃, the stirring speed is 400~500r / min, and the time is 10~20min. In step S3, the mixing temperature is 70~90℃, the stirring speed is 300~400r / min, and the time is 30~60min. In step S4, the mixing temperature is 40~60℃, the stirring speed is 300~400r / min, and the time is 30~60min.

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