Suspending dispersant in paste admixture for concrete and preparation method thereof

Abstract

The present invention provides a suspension dispersant in a slurry admixture for concrete and a preparation method thereof. The raw materials for preparing the suspension dispersant in the slurry admixture for concrete include the following components by weight: 1200-1500 parts of retarder A; 200-400 parts of thickener B; 100-200 parts of reinforcing agent C; the retarder A includes a copolymer of isopentanol polyoxyethylene ether, 2-hydroxyethyl methacrylate, methacryloyloxypropyl trimethoxysilane, dimethylpropyl sulfonamide ethyl methacrylate and acrylic acid; and the reinforcing agent C includes an aqueous solution of sodium metasilicate. The suspension dispersant in the slurry admixture for concrete can effectively inhibit the agglomeration and sedimentation of slurry admixture particles and improve the early and late strength of concrete.

Description

Technical Field

[0001] The invention relates to the field of concrete building materials, in particular to a suspension dispersant used in a slurry admixture of concrete. The invention also relates to a preparation method of the suspension dispersant used in a slurry admixture of concrete. Background Art

[0002] Cement is the main component of adhesives and the main source of carbon emissions. After energy efficiency improvement, clean energy application, raw fuel substitution, carbon capture and storage, etc., carbon emissions are still as high as 1.3 billion tons / year. As a carrier of cement, concrete faces huge pressure to reduce carbon emissions. New types of cement such as geopolymers, high belite sulfoaluminate, and calcium carbide silicate have been developed at home and abroad in order to replace traditional cement on a large scale and achieve carbon reduction. However, it is still difficult to achieve due to the high carbon emissions and performance of raw materials. Therefore, it is difficult to achieve low-carbon goals by reducing carbon emissions of adhesives through low-carbonization of cement in the short term.

[0003] The extensive use of admixtures can significantly reduce the amount of cement and achieve low carbonization of concrete. However, as the country's construction progresses, concrete production has remained at a high level for a long time, and continuous infrastructure construction has caused a serious shortage of high-quality admixtures. In order to meet construction needs, low-grade auxiliary adhesives have been used one after another, but they are limited in activity, have limited ability to replace cement, and have insufficient ability to reduce carbon emissions, and cannot meet the urgent need for low carbonization.

[0004] CN1482088A discloses a slurry-like ground mineral admixture for concrete and a method for making the same. The method adopts a grinding method in water to manufacture a slurry-like concrete admixture containing 40% to 70% by weight of solid fine particles and 30% to 60% by weight of solid fine particles. By utilizing the characteristic that the solid materials have low energy consumption when ground in water, fly ash, slag, coal gangue, phosphorus slag, steel slag, zeolite, and calcined metakaolin are used as the main raw materials, and they are ground in water alone or in combination, or added with silica fume, admixtures, and activators and then ground in water to prepare a slurry-like concrete admixture, which reduces the cost of concrete production, increases the fineness and activity of the admixture, and improves the contribution rate of the admixture to the strength of concrete. However, due to the influence of the electrical properties, groups, minerals, and chemical composition of the slurry-like admixture particles, problems such as particle agglomeration and sedimentation in the slurry admixture occur frequently, which makes it difficult to transport and redisperse the slurry-like auxiliary adhesive material, and the fluidity of long-distance pipeline transportation is poor, and it is easy to accumulate at the bottom of the pipeline, causing pipe blocking accidents.

[0005] Therefore, preparing a suspension dispersant that can effectively inhibit the agglomeration and sedimentation of slurry admixture particles and improve the early and late strength of concrete is of great significance for promoting the wider application of slurry admixtures. Summary of the invention

[0006] In view of this, the present invention proposes a suspending dispersant for use in a slurry admixture of concrete to inhibit agglomeration and sedimentation of particles of the slurry admixture.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0008] A suspension dispersant for use in a slurry admixture of concrete, wherein the raw materials for preparing the suspension dispersant for use in a slurry admixture of concrete include the following components in parts by weight: 1200-1500 parts of an anti-coagulation agent A; 200-400 parts of a thickener B; 100-200 parts of a reinforcing agent C;

[0009] The anticoagulant A comprises a copolymer of isopentanol polyoxyethylene ether, 2-hydroxyethyl methacrylate, methacryloxypropyl trimethoxysilane, dimethylpropyl sulfonamide ethyl methacrylate and acrylic acid;

[0010] The reinforcing agent C includes an aqueous solution of sodium metasilicate.

[0011] Furthermore, the thickener B includes hydroxyethyl methylcellulose and hydroxypropyl methylcellulose.

[0012] The present invention also relates to a method for preparing the above-mentioned suspension dispersant in a slurry admixture for concrete, the preparation method comprising the following steps:

[0013] S1. using a redox reaction to initiate polymerization of isopentanol polyoxyethylene ether, 2-hydroxyethyl methacrylate, methacryloxypropyl trimethoxysilane, dimethylpropyl sulfonamide ethyl methacrylate and acrylic acid to obtain an anticoagulant A;

[0014] S2. Take anticoagulant A, heat it to 40°C, stir it, and drop thickener B solution and enhancer C solution into the anticoagulant A solution. After the dropwise addition is complete, slowly cool it down to room temperature to obtain a suspended dispersant for use in a slurry admixture for concrete.

[0015] Furthermore, step S1 specifically includes the following processes:

[0016] 750-850 parts of isopentanol polyoxyethylene ether, 25-35 parts of 2-hydroxyethyl methacrylate, 25-35 parts of methacryloyloxypropyl trimethoxysilane, and 35-45 parts of dimethylpropyl sulfonamide ethyl methacrylate are added to 900 parts of deionized water at 50-70°C, stirred evenly, cooled to 35°C, and then 13-17 parts of hydrogen peroxide and ferric sulfite solution are added, and an aqueous solution containing 80-100 parts of acrylic acid and a mixed aqueous solution containing 4-6 parts of mercaptopropionic acid and 2-4 parts of ascorbic acid are added dropwise. After the addition is completed, anticoagulant A is obtained.

[0017] Furthermore, the weight average relative molecular mass of the isopentanol polyoxyethylene ether is 2400.

[0018] Furthermore, the preparation method of the thickener B comprises the following steps:

[0019] In a container equipped with a high-speed stirrer, 2-4 parts of 200,000 viscosity hydroxyethyl methylcellulose, 2-4 parts of 200,000 viscosity hydroxypropyl methylcellulose and 1000 parts of deionized water are mixed and stirred at a speed of 1500 r / min to obtain a thickener B.

[0020] Furthermore, the C solution includes 9-11 parts of sodium metasilicate and 89-91 parts of deionized water.

[0021] The suspension dispersant used in the slurry admixture of concrete can effectively inhibit the agglomeration and sedimentation of the slurry admixture particles and improve the early and late strength of concrete.

[0022] Anticoagulant A has good dispersion retention ability. In the high-salt environment of slurry admixtures, it can continuously adsorb the surface of mineral products and maintain the dispersion stability of slurry admixtures through electrostatic repulsion and steric hindrance. Anticoagulant A contains ester groups. In an alkaline environment, the ester groups break, releasing carboxyl groups and complexing Ca 2+ , effectively delaying the agglomeration and sedimentation of particles in the slurry admixture. At the same time, the molecular structure contains silane groups, which produce silanol groups after hydrolysis, and undergo condensation reactions with the silanol groups in the slurry admixture to form higher covalent bonds, thereby reducing the loss of dispersant performance.

[0023] Thickener B forms a network structure in the slurry admixture, thereby increasing the viscosity of the slurry admixture, improving the viscous resistance of the cement slurry system, increasing the sinking friction of the solid particles, reducing the sinking movement, and forming an effective support for the solid particles in the admixture, preventing the sedimentation of the particles, maintaining the sedimentation stability of the slurry admixture, and achieving the effect of suspension stability.

[0024] Strengthening agent C can enhance the early and later strength of concrete. In the alkaline environment of cement, strengthening agent C can react with Ca in cement. 2+ It forms a nucleation effect, promotes the production of hydration products, and improves the early strength of concrete. At the same time, it can stimulate SiO2 and Al2O3 in the paste admixture and promote the growth of the later strength of concrete. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] The experimental methods in the following examples are conventional methods unless otherwise specified. The experimental materials used in the following examples are purchased from conventional biochemical reagent stores unless otherwise specified. In addition, except for special instructions in this example, the terms and processes involved in this example are understood according to the general knowledge and conventional methods in the prior art. Example 1

[0027] This embodiment relates to a suspension dispersant for inhibiting the agglomeration and sedimentation of slurry admixture particles and improving the early and late strength of concrete. The suspension dispersant used in the slurry admixture of concrete includes the following raw materials in parts by weight:

[0028] Anticoagulant A accounts for 1200 parts; thickener B accounts for 400 parts; enhancer C accounts for 200 parts;

[0029] The method for preparing a suspension dispersant in a slurry admixture for concrete comprises the following steps:

[0030] Under stirring and water bath conditions, add 900 parts of deionized water to a three-necked reaction flask, heat the water to 50-70°C, then add 800 parts of TPEG2400 isopentanol polyoxyethylene ether, 30 parts of 2-hydroxyethyl methacrylate, 30 parts of methacryloyloxypropyl trimethoxysilane, and 40 parts of dimethylpropyl sulfonamide ethyl methacrylate, stir for 30 minutes, and after the solution is completely stirred, cool naturally to 35°C.

[0031] Add an activator to the reaction flask. The activator is 15 parts of hydrogen peroxide and 10 parts of ferrous sulfite (1% mass solution). Add material a and material b dropwise (material a is a solution prepared by 90 parts of acrylic acid and 200 parts of deionized water, and material b is a solution prepared by 5 parts of mercaptopropionic acid, 3 parts of ascorbic acid and 300 parts of deionized water). The temperature is controlled at 35°C, and the dropping time is 3 hours. After the dropping is completed, keep warm for 2 hours, add deionized water, control the solid content to 40%, and cool to room temperature to obtain anticoagulant A.

[0032] Take 1200 parts of the above-obtained retarder A, continue to heat up to 40°C, stir at a rate of 400r / min, and drop 400 parts of thickener B solution and 100 parts of thickener C solution into the retarder A. The thickener B solution is a mixture of 200,000 viscosity hydroxyethyl methylcellulose, 200,000 viscosity hydroxypropyl methylcellulose and deionized water in a mass ratio of 3:3:1000, and in a container equipped with a high-speed stirrer, the speed is controlled to 1500r / min, and stirred for 60 minutes to obtain thickener B. The C solution is a solution prepared by 10 parts of sodium metasilicate and 90 parts of deionized water), the dropping time is 2 hours, and the stirring is continued for 1 hour after the dropping is completed, and then the temperature is slowly lowered to room temperature to obtain a suspension dispersant in a slurry admixture for concrete. Example 2

[0033] This embodiment relates to a suspension dispersant for inhibiting the agglomeration and sedimentation of slurry admixture particles and improving the early and late strength of concrete. The suspension dispersant used in the slurry admixture of concrete includes the following raw materials in parts by weight:

[0034] Anticoagulant A accounts for 1500 parts; thickener B accounts for 200 parts; enhancer C accounts for 100 parts;

[0035] The method for preparing a suspended dispersant in a slurry admixture for concrete comprises the following steps:

[0036] Under stirring and water bath conditions, add 900 parts of deionized water to a three-necked reaction flask, heat the water to 50-70°C, then add 800 parts of TPEG2400 isopentanol polyoxyethylene ether, 30 parts of 2-hydroxyethyl methacrylate, 30 parts of methacryloyloxypropyl trimethoxysilane, and 40 parts of dimethylpropyl sulfonamide ethyl methacrylate, stir for 30 minutes, and after the solution is completely stirred, cool naturally to 35°C.

[0037] Add an activator to the reaction flask. The activator is 15 parts of hydrogen peroxide and 10 parts of ferrous sulfite (1% mass solution). Add material a and material b dropwise (material a is a solution prepared by 90 parts of acrylic acid and 200 parts of deionized water, and material b is a solution prepared by 5 parts of mercaptopropionic acid, 3 parts of ascorbic acid and 300 parts of deionized water). The temperature is controlled at 35°C, and the dropping time is 3 hours. After the dropping is completed, keep warm for 2 hours, add deionized water, control the solid content to 40%, and cool to room temperature to obtain anticoagulant A.

[0038] Take 1500 parts of the above-obtained anti-coagulant A, continue to heat up to 40°C, stir at a rate of 400r / min, and drop 200 parts of thickener B solution and 100 parts of C solution into the anti-coagulant A. The thickener B solution is a mixture of 200,000 viscosity hydroxyethyl methylcellulose, 200,000 viscosity hydroxypropyl methylcellulose and deionized water in a mass ratio of 3:3:1000, and in a container equipped with a high-speed stirrer, the speed is controlled to 1500r / min, and stirred for 60 minutes to obtain thickener B. The C solution is a solution prepared by 10 parts of sodium metasilicate and 90 parts of deionized water), the dropping time is 2 hours, and the stirring is continued for 1 hour after the dropping is completed, and then the temperature is slowly lowered to room temperature to obtain a suspension dispersant in a slurry admixture for concrete. Example 3

[0039] This embodiment relates to a suspension dispersant for inhibiting the agglomeration and sedimentation of slurry admixture particles and improving the early and late strength of concrete. The suspension dispersant used in the slurry admixture of concrete includes the following raw materials in parts by weight:

[0040] Anticoagulant A accounts for 1350 parts; thickener B accounts for 300 parts; enhancer C accounts for 150 parts;

[0041] The method for preparing a suspended dispersant in a slurry admixture for concrete comprises the following steps:

[0042] Under stirring and water bath conditions, add 900 parts of deionized water to a three-necked reaction flask, heat the water to 50-70°C, then add 800 parts of TPEG2400 isopentanol polyoxyethylene ether, 30 parts of 2-hydroxyethyl methacrylate, 30 parts of methacryloyloxypropyl trimethoxysilane, and 40 parts of dimethylpropyl sulfonamide ethyl methacrylate, stir for 30 minutes, and after the solution is completely stirred, cool naturally to 35°C.

[0043] Add an activator to the reaction flask. The activator is 15 parts of hydrogen peroxide and 10 parts of ferrous sulfite (1% mass solution). Add material a and material b dropwise (material a is a solution prepared by 90 parts of acrylic acid and 200 parts of deionized water, and material b is a solution prepared by 5 parts of mercaptopropionic acid, 3 parts of ascorbic acid and 300 parts of deionized water). The temperature is controlled at 35°C, and the dropping time is 3 hours. After the dropping is completed, keep warm for 2 hours, add deionized water, control the solid content to 40%, and cool to room temperature to obtain anticoagulant A.

[0044] Take 1350 parts of the above-obtained anti-coagulant A, continue to heat up to 40°C, stir at a rate of 400r / min, and drop 300 parts of thickener B solution and 150 parts of C solution into the anti-coagulant A solution. The thickener B solution is a mixture of 200,000 viscosity hydroxyethyl methylcellulose, 200,000 viscosity hydroxypropyl methylcellulose and deionized water in a mass ratio of 3:3:1000, and in a container equipped with a high-speed stirrer, the speed is controlled to 1500r / min, and stirred for 60 minutes to obtain thickener B. The C solution is a solution prepared by 10 parts of sodium metasilicate and 90 parts of deionized water), the dropping time is 2 hours, and the stirring is continued for 1 hour after the dropping is completed, and then the temperature is slowly lowered to room temperature to obtain a suspension dispersant in a slurry admixture for concrete. Example 4

[0045] This embodiment relates to a suspension dispersant for inhibiting the agglomeration and sedimentation of slurry admixture particles and improving the early and late strength of concrete. The suspension dispersant used in the slurry admixture of concrete includes the following raw materials in parts by weight:

[0046] Anticoagulant A accounts for 1350 parts; thickener B accounts for 250 parts; enhancer C accounts for 200 parts;

[0047] The method for preparing a suspended dispersant in a slurry admixture for concrete comprises the following steps:

[0048] Under stirring and water bath conditions, add 900 parts of deionized water to a three-necked reaction flask, heat the water to 50-70°C, then add 800 parts of TPEG2400 isopentanol polyoxyethylene ether, 30 parts of 2-hydroxyethyl methacrylate, 30 parts of methacryloyloxypropyl trimethoxysilane, and 40 parts of dimethylpropyl sulfonamide ethyl methacrylate, stir for 30 minutes, and after the solution is completely stirred, cool naturally to 35°C.

[0049] Add an activator to the reaction flask. The activator is 15 parts of hydrogen peroxide and 10 parts of ferrous sulfite (1% mass solution). Add material a and material b dropwise (material a is a solution prepared by 90 parts of acrylic acid and 200 parts of deionized water, and material b is a solution prepared by 5 parts of mercaptopropionic acid, 3 parts of ascorbic acid and 300 parts of deionized water). The temperature is controlled at 35°C, and the dropping time is 3 hours. After the dropping is completed, keep warm for 2 hours, add deionized water, control the solid content to 40%, and cool to room temperature to obtain anticoagulant A.

[0050] Take 1350 parts of the above-obtained anti-coagulant A, continue to heat up to 40°C, stir at a rate of 400r / min, and drop 250 parts of thickener B solution and 200 parts of C solution into the anti-coagulant A solution. The thickener B solution is a mixture of 200,000 viscosity hydroxyethyl methylcellulose, 200,000 viscosity hydroxypropyl methylcellulose and deionized water in a mass ratio of 3:3:1000, and in a container equipped with a high-speed stirrer, the speed is controlled to 1500r / min, and stirred for 60 minutes to obtain thickener B. The C solution is a solution prepared by 10 parts of sodium metasilicate and 90 parts of deionized water), the dropping time is 2 hours, and the stirring is continued for 1 hour after the dropping is completed, and then the temperature is slowly lowered to room temperature to obtain a suspension dispersant in a slurry admixture for concrete.

[0051] Comparative Example 1

[0052] Compared with Example 3, the anticoagulant A in the raw materials prepared in Comparative Example 1 was replaced with an equal amount of a polycarboxylic acid dispersant (purchased from Guizhou Jiubenguang New Building Materials Co., Ltd.), and the rest was the same as Example 3.

[0053] Comparative Example 2

[0054] Compared with Example 3, the thickener B in the raw materials prepared in Comparative Example 2 was replaced with an equal amount of sodium carboxymethyl cellulose (purchased from Henan Pinuoxi Bioengineering Co., Ltd.), and the rest was the same as Example 3.

[0055] Comparative Example 3

[0056] Compared with Example 3, the preparation raw materials and methods are basically the same. The difference between Example 3 and Example 3 is that the amount of raw materials is different. The preparation raw materials of this comparative example include the following raw materials in parts by weight: anticoagulant A accounts for 1650 parts; thickener B accounts for 100 parts; enhancer C accounts for 50 parts.

[0057] Suspension stability performance test of slurry admixture:

[0058] The agglomeration and sedimentation of the slurry admixture particles are evaluated by three indicators: the upper and lower layer density deviation rate, the upper and lower layer consistency deviation rate, and the water seepage rate. The calculation formula is as follows. The test process is in accordance with JGJ / T70-2009 "Standard for Test Methods for Basic Properties of Building Mortar". The blank group does not add the suspension dispersant in the slurry admixture used for concrete. In the examples and comparative examples, the amount of suspension dispersant added is 0.04% of the mass of the slurry admixture. The test results are shown in Table 1.

[0059]

[0060] Where:

[0061] D—density deviation rate of slurry admixture (%), accurate to 0.1%;

[0062] ρ 上 , 下 —Density of the upper and lower layers of slurry admixture, in kg / m 3 ;

[0063] ρ max —The greater value of the density of the upper and lower layers of the slurry admixture, in kg / m 3 ;

[0064]

[0065] Where:

[0066] H—consistency deviation rate of slurry admixture (%), accurate to 0.1%;

[0067] C 上 , C 下 —Consistency of the upper and lower layers of the slurry admixture, in mm;

[0068] C max —The greater value of the consistency of the upper and lower layers of the slurry admixture, in kg / m 3 ;

[0069] Table 1 Evaluation of suspension stability of slurry admixtures with different compound products

[0070]

[0071] Concrete performance test:

[0072] The performance of the above-mentioned embodiments and comparative examples was tested by concrete tests, wherein the cement was Esheng P·O42.5 cement, the sand was zone 2 sand with a fineness modulus of 2.8, and the gravel was crushed stone with a continuous grading of 5mm-25mm. The paste admixture replaced 30% of the weight of cement on a dry basis. No suspension dispersant was added to the paste admixture in the blank group. In the embodiments and comparative examples, the corresponding suspension dispersant added to the paste admixture was 0.04% of the paste admixture's own mass. The single-cubic-meter concrete mix is ​​shown in Table 2, and the single-ton concrete admixture formula is: polycarboxylate water reducer: collapse retainer: retarder (sodium gluconate) agent: air entraining agent (triterpenoid saponin): water = 300:100:20:1:579, and the admixture dosage is 1% of the mass of the cementitious material. The results are shown in Table 3 below.

[0073] Table 2 Concrete mix ratio

[0074]

[0075] Table 3 Concrete test results

[0076]

[0077] Conclusion: It can be seen from the test results of the suspension stability performance of the slurry admixture that when the slurry admixture is not added with a suspension dispersant, the density deviation rate between the lower and upper layers of the blank group slurry is higher, the consistency deviation rate is higher, and the water seepage rate is also higher. After the suspension dispersant in the slurry admixture for concrete was added to each embodiment, the density deviation rate, consistency deviation rate, and water seepage rate were significantly reduced, indicating that the slurry is more uniform and stable. Compared with the comparative example, the density deviation rate, consistency deviation rate, and water seepage rate of the embodiment are lower, and the stability and uniformity of the slurry are better.

[0078] From the concrete test results, it can be seen that compared with the blank group, after the suspended dispersant was added to the embodiment, no bleeding or stratification appeared on the surface of the slurry admixture, indicating that the slurry is more uniform and stable. Under the same conditions for the expansion and slump of concrete, the embodiment has a shorter pouring time, better fluidity, and less loss of expansion and slump after 1 hour. In terms of strength, the early 3d, 7d strength and late 28d strength of the embodiment are higher than those of the blank group. Compared with the comparative examples, the slurry admixture surface of each embodiment did not show bleeding or stratification, indicating that the slurry is more uniform and stable. Under the same conditions for the expansion and slump of concrete, the embodiment has a shorter pouring time, better fluidity, and less loss of expansion and slump after 1 hour. In terms of strength, the early 3d, 7d strength and late 28d strength of the embodiment are higher.

[0079] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0080] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A suspension dispersant for a slurry admixture of concrete, characterized in that: The raw materials for preparing the suspension dispersant in the slurry admixture for concrete include the following components by weight: 1200-1500 parts of retarder A; 200-400 parts of thickener B; 100-200 parts of reinforcing agent C; The anticoagulant A comprises a copolymer of isopentanol polyoxyethylene ether, 2-hydroxyethyl methacrylate, methacryloxypropyl trimethoxysilane, dimethylpropyl sulfonamide ethyl methacrylate and acrylic acid; The reinforcing agent C comprises an aqueous solution of sodium metasilicate; The anticoagulant A is obtained by polymerization of isopentanol polyoxyethylene ether, 2-hydroxyethyl methacrylate, methacryloxypropyl trimethoxysilane, dimethylpropyl sulfonamide ethyl methacrylate and acrylic acid by redox reaction.

2. The suspending dispersant in the slurry admixture for concrete according to claim 1, characterized in that: The thickener B includes hydroxyethyl methylcellulose and hydroxypropyl methylcellulose.

3. A method for preparing a suspension dispersant in a slurry admixture for concrete according to claim 1 or 2, characterized in that: The preparation method comprises the following steps: S1. using a redox reaction to initiate polymerization of isopentanol polyoxyethylene ether, 2-hydroxyethyl methacrylate, methacryloxypropyl trimethoxysilane, dimethylpropyl sulfonamide ethyl methacrylate and acrylic acid to obtain an anticoagulant A; S2. Take anticoagulant A, heat it to 40°C, stir it, and drop thickener B solution and enhancer C solution into the anticoagulant A solution. After the dropwise addition is complete, slowly cool it down to room temperature to obtain a suspended dispersant for use in a slurry admixture for concrete.

4. The method for preparing a suspension dispersant in a slurry admixture for concrete according to claim 3, characterized in that: Step S1 specifically includes the following processes: 750-850 parts of isopentanol polyoxyethylene ether, 25-35 parts of 2-hydroxyethyl methacrylate, 25-35 parts of methacryloyloxypropyl trimethoxysilane, and 35-45 parts of dimethylpropyl sulfonamide ethyl methacrylate are added to 900 parts of deionized water at 50-70°C, stirred evenly, cooled to 35°C, and then 13-17 parts of hydrogen peroxide and ferric sulfite solution are added, and an aqueous solution containing 80-100 parts of acrylic acid and a mixed aqueous solution containing 4-6 parts of mercaptopropionic acid and 2-4 parts of ascorbic acid are added dropwise. After the addition is completed, anticoagulant A is obtained.

5. The method for preparing a suspension dispersant in a slurry admixture for concrete according to claim 3, characterized in that: The weight average relative molecular mass of the isopentanol polyoxyethylene ether is 2400.

6. The method for preparing a suspension dispersant in a slurry admixture for concrete according to claim 3, characterized in that: The preparation method of the thickener B comprises the following steps: In a container equipped with a high-speed stirrer, 2-4 parts of 200,000 viscosity hydroxyethyl methylcellulose, 2-4 parts of 200,000 viscosity hydroxypropyl methylcellulose and 1000 parts of deionized water are mixed and stirred at a speed of 1500 r / min to obtain a thickener B.

7. The method for preparing a suspension dispersant in a slurry admixture for concrete according to claim 3, characterized in that: The reinforcing agent C solution includes a solution prepared by 9-11 parts of sodium metasilicate and 89-91 parts of deionized water.

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