An admixture for a capacitor concrete and a method for preparing the same

Abstract

The application discloses a kind of admixtures for capacitor concrete and preparation method thereof, belong to concrete admixture technical field.Admixtures for capacitor concrete includes the following raw materials: electrically conductive polycarboxylate superplasticizer, composite defoamer and water;Electrically conductive polycarboxylate superplasticizer includes the following raw materials: polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether, unsaturated carboxylic acid monomer, 2-acrylamide-2-methylpropane sulfonic acid, chain transfer agent, reducing agent and oxidizing agent, crosslinking agent and water;Composite defoamer includes the following raw materials: glycerol polyether, tributyl phosphate and water.The application also discloses the preparation method of the above-mentioned admixtures for capacitor concrete.The admixtures for capacitor concrete of the application can effectively disperse electrically conductive materials such as carbon black by means of electrostatic adsorption and steric hindrance effect of electrically conductive polycarboxylate superplasticizer, avoid the agglomeration of electrically conductive materials, and further promote the enhancement of the electrically conductive performance of capacitor concrete during the preparation of capacitor concrete.

Description

Technical Field

[0001] This invention belongs to the field of concrete admixture technology, specifically relating to an admixture for capacitor concrete and its preparation method. Background Technology

[0002] Concrete capacitors, as a novel energy storage technology, integrate building structure with energy storage by introducing highly conductive materials such as carbon black into traditional concrete to form an internally interconnected conductive network structure. Concrete capacitors leverage the wide applicability and durability of concrete, providing an energy storage solution with strong environmental adaptability and long cycle life. Their energy storage capacity can be linearly expanded by adjusting the electrode volume, making them suitable for various fields such as smart buildings, infrastructure, and renewable energy storage, demonstrating significant cost-effectiveness and application potential. However, porous conductive media such as carbon black, despite their good conductivity, tend to aggregate and are difficult to disperse. Furthermore, the introduction of large amounts of micron- or nano-sized fine aggregates like carbon black further increases the water demand of the capacitor concrete, directly affecting its conductivity and mechanical properties. How to further improve the conductivity efficiency of capacitor concrete without reducing its durability has become a major challenge limiting the application of concrete capacitors. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide an admixture for capacitor concrete and a method for preparing the same, wherein the capacitor concrete prepared using the admixture has good electrical conductivity and mechanical properties.

[0004] The technical solution adopted to solve its technical problem is to provide an admixture for capacitor concrete, comprising the following raw materials in parts by weight: 20-30 parts of conductive polycarboxylate superplasticizer, 1-2 parts of composite defoamer and 30-80 parts of water;

[0005] The conductive polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 10-30 parts of polyhydroxy polyaniline, 200-400 parts of methyl allyl alcohol polyoxyethylene ether, 10-30 parts of unsaturated carboxylic acid monomer, 10-20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.6-1.5 parts of chain transfer agent, 0.2-1.0 parts of reducing agent, 1-2 parts of oxidizing agent, 0.1-0.3 parts of crosslinking agent, and 350-750 parts of water;

[0006] The compound defoamer comprises the following raw materials in parts by weight: 1-4 parts glycerol polyether, 1-4 parts tributyl phosphate and 10-20 parts water.

[0007] The beneficial effects of the above-mentioned technical solution in this invention are as follows: Capacitor concrete uses concrete as the main body of the capacitor, and its internal conductivity is mainly achieved through carbon black, graphite, etc. The agglomeration of these materials has a significant impact on the overall conductivity of the capacitor. In this invention, the conductivity is enhanced by forming a conjugated π-electron structure through the polymerization of polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether, 2-acrylamide-2-methylpropanesulfonic acid, and unsaturated carboxylic acid monomers. The electrostatic adsorption and steric hindrance effect of the conductive polycarboxylic acid water-reducing agent simultaneously disperses conductive particles such as carbon black and cement particles, enhancing the homogeneity and conductivity of the concrete. Furthermore, the formation of long-sized rigid branches by polyhydroxy polyaniline and the increase in steric hindrance of the water-reducing agent through micro-crosslinking reduce the intercalation effect of the water-reducing agent in the interlayer structure of materials such as carbon black, further improving dispersion ability and enhancing conductivity.

[0008] Preferably, the mixture consists of 20-25 parts of conductive polycarboxylate superplasticizer, 1 part of composite defoamer, and 70-80 parts of water.

[0009] The conductive polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 15-25 parts of polyhydroxy polyaniline, 300-360 parts of methyl allyl alcohol polyoxyethylene ether, 20-30 parts of unsaturated carboxylic acid monomer, 10-15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.9-1.4 parts of chain transfer agent, 0.6-0.8 parts of reducing agent, 1.2-1.6 parts of oxidizing agent, 0.1-0.12 parts of crosslinking agent, and 350-400 parts of water;

[0010] The compound defoamer comprises the following raw materials in parts by weight: 1-3 parts glycerol polyether, 1-2 parts tributyl phosphate and 12-20 parts water.

[0011] More preferably, 25 parts of conductive polycarboxylate superplasticizer, 1 part of composite defoamer and 74 parts of water;

[0012] The conductive polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 25 parts polyhydroxy polyaniline, 360 parts methyl allyl alcohol polyoxyethylene ether, 30 parts unsaturated carboxylic acid monomer, 15 parts 2-acrylamide-2-methylpropanesulfonic acid, 0.9 parts chain transfer agent, 0.6 parts reducing agent, 1.5 parts oxidizing agent, 0.1 parts crosslinking agent, and 375 parts water;

[0013] The compound defoamer comprises the following raw materials in parts by weight: 2 parts glycerol polyether, 1 part tributyl phosphate and 12 parts water.

[0014] More preferably, the molecular weight of polyhydroxy polyaniline is 500-1500; and the molecular weight of methyl allyl alcohol polyoxyethylene ether is 400-1200.

[0015] More preferably, the unsaturated carboxylic acid monomer is at least one of acrylic acid, methacrylic acid and itaconic acid.

[0016] More preferably, the chain transfer agent is sodium hypophosphite, mercaptoethanol, mercaptoacetic acid, or mercaptopropionic acid.

[0017] More preferably, the reducing agent is ascorbic acid, E51, or sodium formaldehyde sulfoxylate; the oxidizing agent is ammonium persulfate, potassium persulfate, or hydrogen peroxide; and the crosslinking agent is N,N-methylenebisacrylamide, silane coupling agent KH-550, isocyanate, or ethylene glycol dimethacrylate.

[0018] More preferably, the glycerol polyether is at least one of polyoxypropylene glycerol polyether and polyoxyethylene glycerol polyether.

[0019] The present invention also provides a method for preparing the above-mentioned admixture for capacitor concrete, comprising the following steps:

[0020] (1) Mix polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and water and heat to obtain solution A;

[0021] (2) Mix the unsaturated carboxylic acid monomer, 2-acrylamide-2-methylpropanesulfonic acid, chain transfer agent and water to obtain solution B;

[0022] (3) Mix the reducing agent and water to obtain solution C;

[0023] (4) Add the oxidant to solution A and add solution B and solution C dropwise. After the addition is complete, add the crosslinking agent, stir and keep warm to obtain conductive polycarboxylate superplasticizer.

[0024] (5) Mix glycerol polyether, tributyl phosphate and water to obtain a composite defoamer;

[0025] (6) Mix conductive polycarboxylate superplasticizer, composite defoamer and water to obtain the admixture for capacitor concrete.

[0026] The beneficial effects of the above technical solution of the present invention are as follows: The synthesis path and structure of the conductive polycarboxylate superplasticizer in the admixture for capacitor concrete of the present invention are as follows:

[0027] ,in Represents the crosslinking point.

[0028] Preferably, in step (1), the temperature is heated to 30~50℃.

[0029] More preferably, in step (1), the temperature is heated to 50°C.

[0030] Preferably, in step (4), the time for adding solution B and solution C is 50~90 min; the temperature for stirring and keeping warm is 30~50℃ and the time is 30~60 min.

[0031] More preferably, in step (4), the time for adding solution B is 50 min and the time for adding solution C is 80 min.

[0032] More preferably, the stirring and heat preservation temperature is 50°C and the time is 60 min.

[0033] The present invention has the following beneficial effects:

[0034] (1) The admixture for capacitor concrete provided by the present invention can effectively disperse conductive materials such as carbon black by means of the electrostatic adsorption and steric hindrance effect of conductive polycarboxylate superplasticizer, and avoid the agglomeration of conductive materials. In the process of preparing capacitor concrete, the doping of conductive materials such as polyhydroxy polyaniline branch chain and carbon black can further promote the enhancement of the conductivity of capacitor concrete.

[0035] (2) The conductive polycarboxylate superplasticizer in the admixture for capacitor concrete provided by the present invention introduces polyhydroxy polyaniline into the polycarboxylate superplasticizer. Due to the conjugated structure of polyhydroxy polyaniline, in the presence of protic acid 2-acrylamide-2-methylpropanesulfonic acid, the polycarboxylate superplasticizer can form a conductive network and ion channels inside the concrete after dispersion and adsorption on the surface of cement particles, which helps to enhance the conductivity of capacitor concrete.

[0036] (3) The conductive polycarboxylate superplasticizer in the admixture for capacitor concrete provided by the present invention increases the steric hindrance effect of polycarboxylate superplasticizer by forming a micro-crosslinked structure containing certain rigid groups, reduces the adsorption of superplasticizer molecules in the interlayer or porous gaps of carbon black, graphite, etc., improves the dispersion ability, reduces the water consumption of capacitor concrete, and enhances its mechanical properties.

[0037] (4) The composite defoamer in the admixture for capacitor concrete provided by the present invention effectively reduces surface tension by means of glycerol polyether and tributyl phosphate, prevents foam formation, promotes the removal of liquid from the liquid film, accelerates foam rupture, reduces the generation of internal pore structure in capacitor concrete, enhances the interconnection between conductive materials such as carbon black, provides a smooth path for the conduction of capacitor concrete, and enhances its mechanical properties and improves the durability of capacitor concrete. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0039] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0041] Example 1

[0042] An admixture for capacitor concrete comprises the following raw materials in parts by weight: 20 parts of conductive polycarboxylate superplasticizer, 1 part of composite defoamer, and 79 parts of deionized water;

[0043] The conductive polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 25 parts of polyhydroxy polyaniline with a molecular weight of 1000, 300 parts of methyl allyl alcohol polyoxyethylene ether with a molecular weight of 800, 20 parts of acrylic acid, 15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1 part of mercaptoethanol, 0.8 parts of ascorbic acid, 1.2 parts of hydrogen peroxide, 0.1 parts of N,N-methylenebisacrylamide, and 360 parts of deionized water;

[0044] The composite defoamer includes the following raw materials in parts by weight: 3 parts polyoxypropylene glycerol polyether, 2 parts tributyl phosphate and 20 parts deionized water.

[0045] This embodiment also provides a method for preparing the above-mentioned admixture for capacitor concrete, including the following steps:

[0046] (1) Add polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water to a reaction vessel, mix well and heat to 50°C to obtain solution A;

[0047] (2) Take another container and mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B;

[0048] (3) Mix ascorbic acid and deionized water to obtain solution C;

[0049] (4) Add hydrogen peroxide to solution A and then add solution B and solution C dropwise in sequence. The dropwise addition time for solution B is 60 min and the dropwise addition time for solution C is 90 min. After the dropwise addition is completed, add N,N-methylenebisacrylamide and stir and keep warm at 50℃ for 60 min to obtain conductive polycarboxylate superplasticizer.

[0050] (5) Mix polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer;

[0051] (6) Mix conductive polycarboxylate superplasticizer, composite defoamer and deionized water to obtain the admixture for capacitor concrete.

[0052] Example 2

[0053] An admixture for capacitor concrete comprises the following raw materials in parts by weight: 20 parts of conductive polycarboxylate superplasticizer, 1 part of composite defoamer, and 79 parts of deionized water;

[0054] The conductive polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 25 parts of polyhydroxy polyaniline with a molecular weight of 1000, 300 parts of methyl allyl alcohol polyoxyethylene ether with a molecular weight of 800, 20 parts of acrylic acid, 10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1.4 parts of mercaptoacetic acid, 0.8 parts of ascorbic acid, 1.6 parts of ammonium persulfate, 0.12 parts of silane coupling agent KH-550, and 360 parts of deionized water;

[0055] The composite defoamer includes the following raw materials in parts by weight: 2 parts polyoxyethylene glycerol polyether, 1 part tributyl phosphate, and 12 parts deionized water.

[0056] This embodiment also provides a method for preparing the above-mentioned admixture for capacitor concrete, including the following steps:

[0057] (1) Add polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water to a reaction vessel, mix well and heat to 50°C to obtain solution A;

[0058] (2) In another container, mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoacetic acid and deionized water to obtain solution B;

[0059] (3) Mix ascorbic acid and deionized water to obtain solution C;

[0060] (4) Add ammonium persulfate to solution A and then add solution B and solution C dropwise in sequence. The dropwise addition time for solution B is 50 min and the dropwise addition time for solution C is 80 min. After the dropwise addition is completed, add silane coupling agent KH-550 and stir and keep warm at 50℃ for 60 min to obtain conductive polycarboxylate superplasticizer.

[0061] (5) Mix polyoxyethylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer;

[0062] (6) Mix conductive polycarboxylate superplasticizer, composite defoamer and deionized water to obtain the admixture for capacitor concrete.

[0063] Example 3

[0064] An admixture for capacitor concrete comprises the following raw materials in parts by weight: 25 parts of conductive polycarboxylate superplasticizer, 1 part of composite defoamer, and 74 parts of deionized water;

[0065] The conductive polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 25 parts of polyhydroxy polyaniline with a molecular weight of 1000, 360 parts of methyl allyl alcohol polyoxyethylene ether with a molecular weight of 800, 30 parts of acrylic acid, 15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.9 parts of mercaptoethanol, 0.6 parts of ascorbic acid, 1.5 parts of ammonium persulfate, 0.1 parts of ethylene glycol dimethacrylate, and 375 parts of deionized water;

[0066] The composite defoamer includes the following raw materials in parts by weight: 1 part polyoxyethylene glycerol polyether, 1 part polyoxypropylene glycerol polyether, 1 part tributyl phosphate, and 12 parts deionized water.

[0067] This embodiment also provides a method for preparing the above-mentioned admixture for capacitor concrete, including the following steps:

[0068] (1) Add polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water to a reaction vessel, mix well and heat to 50°C to obtain solution A;

[0069] (2) Take another container and mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B;

[0070] (3) Mix ascorbic acid and deionized water to obtain solution C;

[0071] (4) Add ammonium persulfate to solution A and then add solution B and solution C dropwise in sequence. The dropwise addition time for solution B is 50 min and the dropwise addition time for solution C is 80 min. After the dropwise addition is completed, add ethylene glycol dimethacrylate and stir and keep warm at 50°C for 60 min to obtain conductive polycarboxylate superplasticizer.

[0072] (5) Mix polyoxyethylene glycerol polyether, polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer.

[0073] (6) Mix conductive polycarboxylate superplasticizer, composite defoamer and deionized water to obtain the admixture for capacitor concrete.

[0074] Example 4

[0075] An admixture for capacitor concrete, wherein the raw materials are the same as those in Example 1 in terms of weight.

[0076] This embodiment also provides a method for preparing the above-mentioned admixture for capacitor concrete, including the following steps:

[0077] (1) Add polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water to a reaction vessel, mix well and heat to 40°C to obtain solution A;

[0078] (2) Take another container and mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B;

[0079] (3) Mix ascorbic acid and deionized water to obtain solution C;

[0080] (4) Add hydrogen peroxide to solution A and then add solution B and solution C dropwise in sequence. The dropwise addition time for solution B is 50 min and the dropwise addition time for solution C is 50 min. After the dropwise addition is completed, add N,N-methylenebisacrylamide and stir and keep warm at 40℃ for 40 min to obtain conductive polycarboxylate superplasticizer.

[0081] (5) Mix polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer;

[0082] (6) Mix conductive polycarboxylate superplasticizer, composite defoamer and deionized water to obtain the admixture for capacitor concrete.

[0083] Example 5

[0084] An admixture for capacitor concrete, wherein the raw materials are the same as those in Example 1 in terms of weight.

[0085] This embodiment also provides a method for preparing the above-mentioned admixture for capacitor concrete, including the following steps:

[0086] (1) Add polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water to a reaction vessel, mix well and heat to 30°C to obtain solution A;

[0087] (2) Take another container and mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B;

[0088] (3) Mix ascorbic acid and deionized water to obtain solution C;

[0089] (4) Add hydrogen peroxide to solution A and then add solution B and solution C dropwise in sequence. The dropwise addition time for solution B is 90 min and the dropwise addition time for solution C is 90 min. After the dropwise addition is completed, add N,N-methylenebisacrylamide and stir and keep warm at 30℃ for 30 min to obtain conductive polycarboxylate superplasticizer.

[0090] (5) Mix polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer;

[0091] (6) Mix conductive polycarboxylate superplasticizer, composite defoamer and deionized water to obtain the admixture for capacitor concrete.

[0092] Experimental Example

[0093] The admixtures for capacitor concrete prepared in Examples 1-5 were mixed with deionized water to a solid content of 10%. Examples 1-5, with a solid content of 10%, and commercially available ordinary polycarboxylate superplasticizer ZJC-1 (solid content 10%, sourced from China Construction Western Construction New Materials Technology Co., Ltd.) were added to the concrete at a certain dosage ratio to form a concrete mixture for testing.

[0094] The workability and mechanical properties of the concrete mixture were tested according to the methods in GB / T 50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" and GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". Copper sheet electrodes were used for the resistivity specimens, with a distance of 100 mm between the two electrodes, and the specimens were aged for 28 days. The concrete mix design is shown in Table 1, where the cement is PO 42.5, the fly ash is grade II fly ash, the carbon black has a mesh size of 400 mesh and a carbon content of 99%, the manufactured sand has a fineness modulus of 2.3 and an MB value of 2.0, and the crushed stone is continuously graded crushed stone with a particle size of 5~31.5 mm. The performance test results are shown in Table 2.

[0095] Table 1. Mix proportions of capacitor concrete (kg / m³) 3 )

[0096]

[0097] Table 2 Performance of Capacitor Concrete

[0098]

[0099] As shown in Table 2, the admixture dosage for capacitor concrete prepared in Examples 1-5 is lower than that of commercially available ordinary polycarboxylate superplasticizer ZJC-1, while the concrete slump and slump spread are greater than those of commercially available ordinary polycarboxylate superplasticizer ZJC-1. Simultaneously, the admixture for capacitor concrete prepared in Examples 1-5 exhibits better dispersion performance in carbon black capacitor concrete, and the compressive strength of the resulting concrete specimens is higher than that of commercially available ordinary polycarboxylate superplasticizer ZJC-1. Therefore, the admixture for capacitor concrete of the present invention contributes to the mechanical properties and durability of capacitors. The concrete resistivity, from smallest to largest, is as follows: Example 3, Example 2, Example 1, Example 5, Example 4, and commercially available ordinary polycarboxylate superplasticizer ZJC-1. The admixtures for capacitor concrete in the examples show better conductivity than conventional admixtures.

[0100] The present invention has been described according to the above embodiments. It should be understood that the above embodiments do not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the scope of the present invention.

Claims

1. An admixture for capacitor concrete, characterized in that, The raw materials include the following parts by weight: 20-25 parts of conductive polycarboxylate superplasticizer, 1 part of composite defoamer, and 70-80 parts of water; The conductive polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 15-25 parts of polyhydroxy polyaniline, 300-360 parts of methyl allyl alcohol polyoxyethylene ether, 20-30 parts of unsaturated carboxylic acid monomer, 10-15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.9-1.4 parts of chain transfer agent, 0.6-0.8 parts of reducing agent, 1.2-1.6 parts of oxidizing agent, 0.1-0.12 parts of crosslinking agent, and 350-400 parts of water; The composite defoamer comprises the following raw materials in parts by weight: 1-3 parts glycerol polyether, 1-2 parts tributyl phosphate, and 12-20 parts water; The unsaturated carboxylic acid monomer is at least one of acrylic acid, methacrylic acid, and itaconic acid; the glycerol polyether is at least one of polyoxypropylene glycerol polyether and polyoxyethylene glycerol polyether.

2. The admixture for capacitor concrete as described in claim 1, characterized in that, The molecular weight of the polyhydroxy polyaniline is 500-1500; the molecular weight of the methyl allyl alcohol polyoxyethylene ether is 400-1200.

3. The admixture for capacitor concrete as described in claim 1, characterized in that, The chain transfer agent is sodium hypophosphite, mercaptoethanol, mercaptoacetic acid, or mercaptopropionic acid.

4. The admixture for capacitor concrete as described in claim 1, characterized in that, The reducing agent is ascorbic acid, E51, or sodium formaldehyde sulfoxylate; the oxidizing agent is ammonium persulfate, potassium persulfate, or hydrogen peroxide; the crosslinking agent is N,N-methylenebisacrylamide, silane coupling agent KH-550, isocyanate, or ethylene glycol dimethacrylate.

5. The method for preparing the admixture for capacitor concrete according to any one of claims 1 to 4, characterized in that, Includes the following steps: (1) Mix polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and water and heat to obtain solution A; (2) Mix the unsaturated carboxylic acid monomer, 2-acrylamide-2-methylpropanesulfonic acid, chain transfer agent and water to obtain solution B; (3) Mix the reducing agent and water to obtain solution C; (4) Add the oxidant to solution A and add solution B and solution C dropwise. After the addition is complete, add the crosslinking agent, stir and keep warm to obtain conductive polycarboxylate superplasticizer. (5) Mix glycerol polyether, tributyl phosphate and water to obtain a composite defoamer; (6) Mix conductive polycarboxylate superplasticizer, composite defoamer and water to obtain the admixture for capacitor concrete.

6. The method for preparing the admixture for capacitor concrete as described in claim 5, characterized in that, In step (1), the temperature is heated to 30~50℃.

7. The method for preparing the admixture for capacitor concrete as described in claim 5, characterized in that, In step (4), the time for adding solution B and solution C is 50-90 min; the temperature for stirring and keeping warm is 30-50℃ and the time is 30-60 min.

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