Additive for capacitor concrete and preparation method thereof

Abstract

The invention discloses an admixture for capacitor concrete and a preparation method thereof, and belongs to the technical field of concrete admixtures. The additive for capacitor concrete comprises the following raw materials: a conductive polycarboxylic acid water reducer, a composite defoaming agent and water, the conductive polycarboxylic acid water reducing agent is prepared from the following raw materials: polyhydroxy polyaniline, methallyl alcohol polyoxyethylene ether, an unsaturated carboxylic acid monomer, 2-acrylamide-2-methylpropanesulfonic acid, a chain transfer agent, a reducing agent, an oxidizing agent, a cross-linking agent and water. The composite defoaming agent comprises the following raw materials: glyceryl polyether, tributyl phosphate and water. The invention also discloses a preparation method of the additive for capacitor concrete. According to the additive for the capacitor concrete, conductive materials such as carbon black can be effectively dispersed by virtue of electrostatic adsorption and steric hindrance effects of the conductive polycarboxylate superplasticizer, agglomeration of the conductive materials is avoided, and enhancement of the conductivity of the capacitor concrete can be further promoted in the process of preparing the capacitor concrete.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to an admixture for capacitor concrete and a preparation method thereof. Background Art

[0002] As a new type of energy storage technology, concrete capacitors integrate building structure and energy storage by introducing highly conductive carbon black and other substances into traditional concrete materials to form an internally interconnected conductive network structure. Concrete capacitors take advantage of the wide applicability and durability of concrete to provide an energy storage solution with strong environmental adaptability and long cycle life. Its energy storage capacity can be linearly expanded by adjusting the electrode volume. It is suitable for smart buildings, infrastructure, and renewable energy storage, and has significant cost-effectiveness and application potential. However, porous conductive media such as carbon black with good conductivity are easy to aggregate and difficult to disperse. At the same time, the introduction of a large amount of fine aggregates such as micron or nanometer-sized carbon black further increases the water demand of capacitor concrete, which directly affects the conductive and mechanical properties of capacitor concrete. How to further improve the conductive efficiency of capacitor concrete without reducing the durability of concrete has become a problem that limits 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 preparation method thereof, wherein the capacitor concrete prepared by using the admixture has good electrical conductivity and mechanical properties.

[0004] The technical solution adopted to solve the technical problem is to provide an admixture for capacitor concrete, comprising the following raw materials in parts by weight: 20-30 parts of conductive polycarboxylic acid water reducer, 1-2 parts of composite defoamer and 30-80 parts of water; The conductive polycarboxylate water-reducing agent 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-methylpropane sulfonic acid, 0.6-1.5 parts of chain transfer agent, 0.2-1.0 parts of reducing agent and 1-2 parts of oxidizing agent, 0.1-0.3 parts of cross-linking agent and 350-750 parts of water; The composite defoamer comprises the following raw materials in parts by weight: 1-4 parts of glycerol polyether, 1-4 parts of tributyl phosphate and 10-20 parts of water.

[0005] The beneficial effects of the above technical solution adopted in the present invention are as follows: the capacitor concrete is composed of concrete to form the main part of the capacitor, and the interior thereof is mainly conductive through carbon black, graphite, etc., and the agglomeration of such materials has a great influence on the overall conductive performance of the capacitor. In the present invention, the conductive performance is enhanced by using polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether, 2-acrylamide-2-methylpropane sulfonic acid, unsaturated carboxylic acid monomers, etc. to form a conjugated π electron structure after polymerization; by means of the electrostatic adsorption and steric hindrance effect of the conductive polycarboxylic acid water reducer, conductive particles such as carbon black and cement particles are dispersed at the same time to enhance the homogeneity and conductivity of the concrete; by means of polyhydroxy polyaniline to form a longer rigid side chain, and by micro-crosslinking, the steric hindrance of the water reducer is increased, and the intercalation effect of the water reducer in the interlayer structure of materials such as carbon black is reduced, the dispersion ability is further improved, and the conductive performance is enhanced at the same time.

[0006] Preferably, 20-25 parts of conductive polycarboxylate water reducer, 1 part of composite defoamer and 70-80 parts of water; The conductive polycarboxylate water-reducing agent 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-methylpropane sulfonic acid, 0.9-1.4 parts of chain transfer agent, 0.6-0.8 parts of reducing agent and 1.2-1.6 parts of oxidizing agent, 0.1-0.12 parts of cross-linking agent and 350-400 parts of water; The composite defoamer comprises the following raw materials in parts by weight: 1-3 parts of glycerol polyether, 1-2 parts of tributyl phosphate and 12-20 parts of water.

[0007] More preferably, 25 parts of conductive polycarboxylate water reducer, 1 part of composite defoamer and 74 parts of water; The conductive polycarboxylate water-reducing agent comprises the following raw materials in parts by weight: 25 parts of polyhydroxy polyaniline, 360 parts of methyl allyl alcohol polyoxyethylene ether, 30 parts of unsaturated carboxylic acid monomer, 15 parts of 2-acrylamide-2-methylpropane sulfonic acid, 0.9 parts of chain transfer agent, 0.6 parts of reducing agent and 1.5 parts of oxidizing agent, 0.1 parts of cross-linking agent and 375 parts of water; The composite defoamer comprises the following raw materials in parts by weight: 2 parts of glycerol polyether, 1 part of tributyl phosphate and 12 parts of water.

[0008] More preferably, the molecular weight of polyhydroxypolyaniline is 500-1500; the molecular weight of methyl allyl alcohol polyoxyethylene ether is 400-1200.

[0009] More preferably, the unsaturated carboxylic acid monomer is at least one of acrylic acid, methacrylic acid and itaconic acid.

[0010] More preferably, the chain transfer agent is sodium hypophosphite, mercaptoethanol, thioglycolic acid or mercaptopropionic acid.

[0011] More preferably, the reducing agent is ascorbic acid, E51 or bleaching agent; 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.

[0012] More preferably, the glycerol polyether is at least one of polyoxypropylene glycerol polyether and polyoxyethylene glycerol polyether.

[0013] The present invention also provides a method for preparing the above capacitor concrete admixture, comprising the following steps: (1) mixing polyhydroxypolyaniline, methyl allyl alcohol polyoxyethylene ether and water and heating them to obtain solution A; (2) mixing unsaturated carboxylic acid monomer, 2-acrylamide-2-methylpropane sulfonic acid, chain transfer agent and water to obtain solution B; (3) Mix the reducing agent and water to obtain solution C; (4) adding an oxidant to solution A and dropwise adding solution B and solution C, and after the dropwise addition is complete, adding a crosslinking agent, stirring and keeping warm to obtain a conductive polycarboxylate water-reducing agent; (5) mixing glycerol polyether, tributyl phosphate and water to obtain a composite defoamer; (6) The conductive polycarboxylic acid water-reducing agent, the composite defoaming agent and water are mixed to obtain an admixture for capacitor concrete.

[0014] The beneficial effects of the above technical solution of the present invention are as follows: the synthesis path and structure of the conductive polycarboxylate water-reducing agent in the capacitor concrete admixture of the present invention are as follows: , in Represents the cross-linking point.

[0015] Preferably, the heating in step (1) is to a temperature of 30-50°C.

[0016] More preferably, the heating in step (1) is to a temperature of 50°C.

[0017] Preferably, in step (4), the time for adding solution B and solution C dropwise is 50-90 min; the temperature for stirring and keeping warm is 30-50° C., and the time is 30-60 min.

[0018] More preferably, in step (4), the time for adding solution B dropwise is 50 min, and the time for adding solution C dropwise is 80 min.

[0019] More preferably, the stirring and heat-insulating temperature is 50° C. and the time is 60 min.

[0020] The present invention has the following beneficial effects: (1) The capacitor concrete admixture provided by the present invention can effectively disperse conductive materials such as carbon black and avoid agglomeration of conductive materials by means of electrostatic adsorption and steric hindrance effect of conductive polycarboxylate water-reducing agent. In the process of preparing capacitor concrete, the doping of conductive materials such as polyhydroxy polyaniline side chains and carbon black can further promote the enhancement of the conductive performance of capacitor concrete. (2) The conductive polycarboxylate water-reducing agent in the capacitor concrete admixture provided by the present invention is characterized by introducing polyhydroxy polyaniline into the polycarboxylate water-reducing agent. Due to the conjugated structure of the polyhydroxy polyaniline, in the presence of protonic acid 2-acrylamide-2-methylpropane sulfonic acid, the polycarboxylate water-reducing agent is dispersed and adsorbed on the surface of cement particles to form a conductive network and ion channels inside the concrete, thereby helping to enhance the conductive properties of the capacitor concrete. (3) The conductive polycarboxylate water reducer in the capacitor concrete admixture provided by the present invention increases the steric hindrance effect of the polycarboxylate water reducer by forming a micro-crosslinked structure containing certain rigid groups, reduces the adsorption of water reducer molecules in the interlayers or porous gaps of carbon black, graphite, etc., improves the dispersion ability, reduces the water consumption of capacitor concrete, and enhances its mechanical properties; (4) The composite defoamer in the capacitor concrete admixture provided by the present invention effectively reduces the surface tension with the help of glycerol polyether and tributyl phosphate, prevents the formation of foam, promotes the removal of liquid in the liquid film, accelerates the foam rupture, reduces the generation of pore structure inside the capacitor concrete, enhances the interconnection between conductive materials such as carbon black, provides a smooth path for the conduction of the capacitor concrete, enhances its mechanical properties, and improves the durability of the capacitor concrete. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with embodiment.It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all embodiments.If the specific conditions are not indicated in the embodiments, they are carried out according to the conditions recommended by the normal conditions or the manufacturers.If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be obtained by commercial purchase.

[0022] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0023] The features and performance of the present invention are further described in detail below in conjunction with embodiments.

[0024] Example 1 An admixture for capacitor concrete, comprising the following raw materials in parts by weight: 20 parts of conductive polycarboxylate water reducer, 1 part of composite defoamer and 79 parts of deionized water; The conductive polycarboxylate water-reducing agent 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-methylpropane sulfonic 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; The composite defoamer comprises the following raw materials in parts by weight: 3 parts of polyoxypropylene glycerol polyether, 2 parts of tributyl phosphate and 20 parts of deionized water.

[0025] This embodiment also provides a method for preparing the capacitor concrete admixture, comprising the following steps: (1) adding polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water into a reaction container, mixing well and heating to 50° C. to obtain solution A; (2) In another container, mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B; (3) Mix ascorbic acid and deionized water to obtain solution C; (4) adding hydrogen peroxide to solution A and then dripping solution B and solution C in sequence, wherein the dripping time of solution B is 60 min and the dripping time of solution C is 90 min. After the dripping is completed, N,N-methylenebisacrylamide is added and stirred at 50° C. for 60 min to obtain a conductive polycarboxylic acid water reducer; (5) mixing polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer; (6) The conductive polycarboxylic acid water-reducing agent, the composite defoaming agent and deionized water are mixed to obtain an admixture for capacitor concrete.

[0026] Example 2 An admixture for capacitor concrete, comprising the following raw materials in parts by weight: 20 parts of conductive polycarboxylate water reducer, 1 part of composite defoamer and 79 parts of deionized water; The conductive polycarboxylate water-reducing agent includes 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-methylpropane sulfonic acid, 1.4 parts of thioglycolic acid, 0.8 parts of ascorbic acid and 1.6 parts of ammonium persulfate, 0.12 parts of silane coupling agent KH-550 and 360 parts of deionized water; The composite defoamer comprises the following raw materials in parts by weight: 2 parts of polyoxyethylene glycerol polyether, 1 part of tributyl phosphate and 12 parts of deionized water.

[0027] This embodiment also provides a method for preparing the capacitor concrete admixture, comprising the following steps: (1) adding polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water into a reaction container, mixing well and heating to 50° C. to obtain solution A; (2) In another container, mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, thioglycolic acid and deionized water to obtain solution B; (3) Mix ascorbic acid and deionized water to obtain solution C; (4) adding ammonium persulfate to solution A and then dripping solution B and solution C in sequence, wherein the dripping time of solution B is 50 min and the dripping time of solution C is 80 min. After the dripping is completed, silane coupling agent KH-550 is added and stirred at 50° C. for 60 min to obtain a conductive polycarboxylate water reducer; (5) mixing polyoxyethylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer; (6) The conductive polycarboxylic acid water-reducing agent, the composite defoaming agent and deionized water are mixed to obtain an admixture for capacitor concrete.

[0028] Example 3 An admixture for capacitor concrete, comprising the following raw materials in parts by weight: 25 parts of conductive polycarboxylate water reducer, 1 part of composite defoamer and 74 parts of deionized water; The conductive polycarboxylate water-reducing agent includes 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-methylpropane sulfonic 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; The composite defoamer comprises the following raw materials in parts by weight: 1 part of polyoxyethylene glycerol polyether, 1 part of polyoxypropylene glycerol polyether, 1 part of tributyl phosphate and 12 parts of deionized water.

[0029] This embodiment also provides a method for preparing the capacitor concrete admixture, comprising the following steps: (1) adding polyhydroxy polyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water into a reaction container, mixing well and heating to 50° C. to obtain solution A; (2) In another container, mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B; (3) Mix ascorbic acid and deionized water to obtain solution C; (4) adding ammonium persulfate to solution A and then dripping solution B and solution C in sequence, wherein the dripping time of solution B is 50 min and the dripping time of solution C is 80 min. After the dripping is completed, ethylene glycol dimethacrylate is added and stirred at 50° C. for 60 min to obtain a conductive polycarboxylate water reducer; (5) mixing polyoxyethylene glycerol polyether, polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer; (6) The conductive polycarboxylic acid water-reducing agent, the composite defoaming agent and deionized water are mixed to obtain an admixture for capacitor concrete.

[0030] Example 4 An admixture for capacitor concrete, wherein the raw materials are the same as those in Example 1 in parts by weight.

[0031] This embodiment also provides a method for preparing the capacitor concrete admixture, comprising the following steps: (1) adding polyhydroxypolyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water into a reaction container, mixing well and heating to 40° C. to obtain solution A; (2) In another container, mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B; (3) Mix ascorbic acid and deionized water to obtain solution C; (4) adding hydrogen peroxide to solution A and then dripping solution B and solution C in sequence, wherein the dripping time of solution B is 50 min and the dripping time of solution C is 50 min. After the dripping is completed, N,N-methylenebisacrylamide is added and stirred at 40° C. for 40 min to obtain a conductive polycarboxylic acid water reducer; (5) mixing polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer; (6) The conductive polycarboxylic acid water-reducing agent, the composite defoaming agent and deionized water are mixed to obtain an admixture for capacitor concrete.

[0032] Example 5 An admixture for capacitor concrete, wherein the raw materials are the same as those in Example 1 in parts by weight.

[0033] This embodiment also provides a method for preparing the capacitor concrete admixture, comprising the following steps: (1) adding polyhydroxypolyaniline, methyl allyl alcohol polyoxyethylene ether and deionized water into a reaction container, mixing well and heating to 30° C. to obtain solution A; (2) In another container, mix acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, mercaptoethanol and deionized water to obtain solution B; (3) Mix ascorbic acid and deionized water to obtain solution C; (4) adding hydrogen peroxide to solution A and then dripping solution B and solution C in sequence, the dripping time of solution B is 90 min, and the dripping time of solution C is 90 min. After the dripping is completed, N,N-methylenebisacrylamide is added and stirred at 30° C. for 30 min to obtain a conductive polycarboxylic acid water reducer; (5) mixing polyoxypropylene glycerol polyether, tributyl phosphate and deionized water to obtain a composite defoamer; (6) The conductive polycarboxylic acid water-reducing agent, the composite defoaming agent and deionized water are mixed to obtain an admixture for capacitor concrete.

[0034] Experimental example The capacitor concrete admixtures prepared in Examples 1 to 5 were mixed with deionized water to prepare a solid content of 10%. Examples 1 to 5, all with a solid content of 10%, and a commercially available common polycarboxylate water reducer ZJC-1 (solid content 10%, sourced from China Construction Western Construction New Materials Technology Co., Ltd.) were added to concrete in a certain dosage ratio to form a concrete mixture for testing.

[0035] The working performance and mechanical properties of concrete mixtures were tested according to the test methods in GB / T 50080-2016 "Standard for Test Methods of Ordinary Concrete Mixtures" and GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". The resistivity test piece electrodes were copper sheet electrodes, the distance between the two electrodes was 100 mm, and the specimen age was 28 days. The concrete mix ratio is shown in Table 1, where the cement in the concrete is PO 42.5, the fly ash is secondary fly ash, the carbon black mesh is 400 mesh and the carbon content is 99%, the fineness modulus of the machine-made sand is 2.3 and the MB value is 2.0, and the crushed stone is a continuous graded crushed stone with a particle size of 5-31.5 mm; the performance test results are shown in Table 2.

[0036] Table 1 Capacitor concrete mix ratio (kg / m 3 )

[0037] Table 2 Capacitor concrete properties

[0038] It can be seen from Table 2 that the amount of the capacitor concrete admixture prepared in Examples 1 to 5 is lower than that of the commercially available ordinary polycarboxylate water-reducing agent ZJC-1, and the slump and slump expansion of the concrete are both greater than those of the commercially available ordinary polycarboxylate water-reducing agent ZJC-1; at the same time, the capacitor concrete admixtures prepared in Examples 1 to 5 have better dispersion properties in carbon black capacitor concrete, and the compressive strength of the obtained concrete specimens is higher than that of the commercially available ordinary polycarboxylate water-reducing agent ZJC-1. It can be seen that the capacitor concrete admixture of the present invention contributes to the mechanical properties and durability of the capacitor; the concrete resistivity is from small to large in order of Example 3, Example 2, Example 1, Example 5, Example 4 and the commercially available ordinary polycarboxylate water-reducing agent ZJC-1, and the capacitor concrete admixtures of the examples have better conductivity than conventional admixtures.

[0039] 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 form. Any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the scope of the present invention.

Claims

1. An admixture for capacitor concrete, characterized in that: The invention comprises the following raw materials in parts by weight: 20-30 parts of conductive polycarboxylate water reducer, 1-2 parts of composite defoamer and 30-80 parts of water; The conductive polycarboxylate water-reducing agent 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-methylpropane sulfonic acid, 0.6-1.5 parts of chain transfer agent, 0.2-1.0 parts of reducing agent and 1-2 parts of oxidizing agent, 0.1-0.3 parts of cross-linking agent and 350-750 parts of water; The composite defoamer comprises the following raw materials in parts by weight: 1-4 parts of glycerol polyether, 1-4 parts of tributyl phosphate and 10-20 parts of water.

2. The capacitor concrete admixture according to claim 1, wherein: The invention comprises the following raw materials in parts by weight: 20-25 parts of conductive polycarboxylate water reducer, 1 part of composite defoamer and 70-80 parts of water; The conductive polycarboxylate water-reducing agent 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-methylpropane sulfonic acid, 0.9-1.4 parts of chain transfer agent, 0.6-0.8 parts of reducing agent and 1.2-1.6 parts of oxidizing agent, 0.1-0.12 parts of cross-linking agent and 350-400 parts of water; The composite defoamer comprises the following raw materials in parts by weight: 1-3 parts of glycerol polyether, 1-2 parts of tributyl phosphate and 12-20 parts of water.

3. The capacitor concrete admixture according to claim 1 or 2, characterized in that: The molecular weight of the polyhydroxypolyaniline is 500-1500; the molecular weight of the methyl allyl alcohol polyoxyethylene ether is 400-1200.

4. The capacitor concrete admixture according to claim 1 or 2, characterized in that: The unsaturated carboxylic acid monomer is at least one of acrylic acid, methacrylic acid and itaconic acid.

5. The capacitor concrete admixture according to claim 1 or 2, characterized in that: The chain transfer agent is sodium hypophosphite, mercaptoethanol, thioglycolic acid or mercaptopropionic acid.

6. The capacitor concrete admixture according to claim 1 or 2, characterized in that: The reducing agent is ascorbic acid, E51 or bleaching agent; the oxidizing agent is ammonium persulfate, potassium persulfate or hydrogen peroxide; the cross-linking agent is N,N-methylenebisacrylamide, silane coupling agent KH-550, isocyanate or ethylene glycol dimethacrylate.

7. The capacitor concrete admixture according to claim 1 or 2, characterized in that: The glycerol polyether is at least one of polyoxypropylene glycerol polyether and polyoxyethylene glycerol polyether.

8. The method for preparing the capacitor concrete admixture according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) mixing polyhydroxypolyaniline, methyl allyl alcohol polyoxyethylene ether and water and heating them to obtain solution A; (2) mixing unsaturated carboxylic acid monomer, 2-acrylamide-2-methylpropane sulfonic acid, chain transfer agent and water to obtain solution B; (3) Mix the reducing agent and water to obtain solution C; (4) adding an oxidant to solution A and dropwise adding solution B and solution C, and after the dropwise addition is complete, adding a crosslinking agent, stirring and keeping warm to obtain a conductive polycarboxylate water-reducing agent; (5) mixing glycerol polyether, tributyl phosphate and water to obtain a composite defoamer; (6) The conductive polycarboxylic acid water-reducing agent, the composite defoaming agent and water are mixed to obtain an admixture for capacitor concrete.

9. The method for preparing the capacitor concrete admixture according to claim 8, characterized in that: In the step (1), the temperature is heated to 30-50°C.

10. The method for preparing the capacitor concrete admixture according to claim 8, characterized in that: In the step (4), the time for adding solution B and solution C dropwise is 50-90 min; the temperature for stirring and keeping warm is 30-50° C. and the time is 30-60 min.

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