Highly adaptable six-carbon polycarboxylate admixture and its preparation method

Abstract

This application relates to the field of concrete admixture technology, specifically disclosing a highly adaptable hexacarbon polycarboxylate admixture and its preparation method. A highly adaptable hexacarbon polycarboxylate admixture comprises the following raw materials in parts by weight: 150-200 parts of a hexacarbon macromonomer, 10-20 parts of a functional monomer, 3-8 parts of an ester monomer, 2-5 parts of a silane coupling agent containing carbon-carbon double bonds, 1-5 parts of a chain transfer agent, 0.5-2 parts of a redox initiator, 5-10 parts of a pH adjuster, and 200-300 parts of water; the hexacarbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether in a mass ratio of (2-5):1; the functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of (1-3):1. The hexacarbon polycarboxylate admixture obtained by this application exhibits strong adaptability, with excellent water reduction rate, slump retention, mud resistance, and workability.

Description

Technical Field

[0001] This application relates to the field of concrete admixtures, and more specifically, to a highly adaptable six-carbon polycarboxylate admixture and its preparation method. Background Technology

[0002] Polycarboxylate superplasticizers are high-performance water-reducing agents that prevent slump loss in concrete without causing significant retardation. They can achieve high plasticizing effects even at low dosages, giving concrete excellent workability, good strength development, and superior durability. Polycarboxylate superplasticizers have good comprehensive technical performance advantages and environmental protection characteristics, meeting the needs of modern concrete engineering and are widely used in highways, bridges, dams, tunnels, high-rise buildings, and other projects.

[0003] Given the current scarcity of natural river sand, manufactured sand is gradually replacing it. However, the production technology for manufactured sand is still immature, resulting in instability in the fineness modulus, mud content, and particle morphology of the produced sand. Furthermore, manufactured sand exhibits a higher adsorption capacity for polycarboxylate admixtures, leading to poor adaptability of these admixtures and consequently, poor slump retention and workability in concrete. Summary of the Invention

[0004] In order to improve the adaptability of polycarboxylate admixtures, thereby giving them better slump retention and workability, this application provides a highly adaptable six-carbon polycarboxylate admixture and its preparation method.

[0005] In a first aspect, this application provides a highly adaptable six-carbon polycarboxylate additive, employing the following technical solution:

[0006] A highly adaptable hexacarbon polycarboxylate additive, comprising the following raw materials in parts by weight:

[0007] 150-200 parts of a six-carbon macromonomer, 10-20 parts of a functional monomer, 3-8 parts of an ester monomer, 2-5 parts of a silane coupling agent containing a carbon-carbon double bond, 1-5 parts of a chain transfer agent, 0.5-2 parts of a redox system initiator, 5-10 parts of a pH adjuster, and 200-300 parts of water.

[0008] The six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl polyoxyethylene ether in a mass ratio of (2-5):1;

[0009] The functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of (1-3):1.

[0010] In the above scheme, ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether are compounded in a specified ratio as a six-carbon macromonomer. Because the unsaturated double bond in the six-carbon macromonomer's molecular structure is directly connected to an oxygen atom, the electron cloud distribution of the double bond shifts, resulting in higher reactivity of the double bond and easier polymerization. Furthermore, based on its molecular structure, the polyether side chain has lower spatial resistance, thus improving its encapsulation and entanglement properties. The resulting polycarboxylate additive is more adaptable to poor-quality manufactured sand with high mud content, resulting in better slump retention and workability in practical application.

[0011] Meanwhile, using silane coupling agents containing carbon-carbon double bonds as one of the raw materials, the silane coupling agents containing carbon-carbon double bonds participate in the system reaction and ultimately increase the molecular size of the obtained polycarboxylate admixture. This makes it more difficult for the polycarboxylate admixture to enter the soil layer during actual use, thereby effectively reducing the situation where the manufactured sand has a large adsorption amount of polycarboxylate admixture due to its high mud content. In other words, the anti-mud properties of the polycarboxylate admixture are effectively improved.

[0012] Furthermore, the polycarboxylate admixture obtained by using acrylic acid and 2-nitroethyl acrylate as functional monomers exhibits superior overall performance. 2-nitroethyl acrylate, due to its nitro group, introduces a hydrophobic electronegative group into the polycarboxylate molecule. Since the soil in manufactured sand is predominantly negatively charged in concrete systems, the charge effect causes the polycarboxylate admixture to tend to move away from the soil during application, thus reducing the amount of admixture adsorbed by the soil. Moreover, the hydrophobicity of the nitro group further reduces the amount of admixture adsorbed by the soil in the concrete system, thereby improving the adaptability of the polycarboxylate admixture. In addition, the combination of 2-nitroethyl acrylate and ester monomers allows for the slow hydrolysis of the ester group to release anchoring carboxyl anions under alkaline conditions, providing a sustained dispersing effect on cement particles and hydration products. This further enhances the adaptability of the polycarboxylate admixture and has a positive effect on improving its slump retention and workability.

[0013] In one specific implementation, the highly adaptable hexacarbon polycarboxylate admixture comprises the following raw materials in parts by weight:

[0014] 170-180 parts of six-carbon macromonomer, 14-18 parts of functional monomer, 5-7 parts of ester monomer, 3-4 parts of silane coupling agent containing carbon-carbon double bond, 2-4 parts of chain transfer agent, 1-2 parts of redox system initiator, 6-9 parts of pH adjuster, and 230-260 parts of water.

[0015] The six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl polyoxyethylene ether in a mass ratio of (3-4):1;

[0016] The functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of (2-3):1.

[0017] By adopting the above technical solution and further optimizing the dosage of each raw material in the formula, the resulting polycarboxylate additive has better overall performance.

[0018] In one specific feasible embodiment, the 2-nitroethyl acrylate is prepared as follows:

[0019] Mix 2-nitroethanol, acrylic acid, concentrated sulfuric acid, cuprous chloride and toluene, and heat under reflux for 2-4 hours in a nitrogen atmosphere. After the reaction is complete, wash the product with deionized water, dry it with a drying agent, filter it and then distill the filtrate under reduced pressure. Collect the fraction with a boiling point of 90±2℃ to obtain 2-nitroethyl acrylate.

[0020] In one specific implementation, the molecular weight of the ethylene glycol monovinyl polyethylene glycol ether is 3000-4000, and the molecular weight of the 4-hydroxybutylvinyl polyoxyethylene ether is 4000-5000.

[0021] In one specific implementation, the ester monomer includes at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, methyl acrylate, dimethyl maleate, and diethyl maleate.

[0022] In one specific implementation, the carbon-carbon double bond-containing silane coupling agent includes at least one of vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane, γ-methacryloxypropyltrimethoxysilane, and vinyltriethoxysilane.

[0023] In one specific implementation, the chain transfer agent includes at least one of mercaptoacetic acid, mercaptopropionic acid, sodium hypophosphite, and mercaptoethanol.

[0024] In one specific implementation, the redox system initiator is composed of an oxidant and a reductant, wherein the mass ratio of the oxidant to the reductant is (10-18):1, the oxidant includes at least one of hydrogen peroxide and persulfate, and the reductant includes at least one of sodium sulfite, ferrous sulfate, and ascorbic acid.

[0025] Secondly, this application provides a method for preparing a highly adaptable six-carbon polycarboxylate additive, employing the following technical solution:

[0026] A method for preparing a highly adaptable six-carbon polycarboxylate admixture includes the following steps:

[0027] (1) Mix functional monomers, ester monomers, silane coupling agents containing carbon-carbon double bonds and water to obtain material A; mix chain transfer agents, redox system initiators and water to obtain material B;

[0028] (2) Mix the six-carbon macromonomer and water to obtain the base material; at the same time, add material A and material B dropwise to the base material. After the addition of material A and material B, react at room temperature for 1-1.5 hours. Then add pH adjuster and mix to obtain anti-slump type six-carbon polycarboxylic acid admixture.

[0029] The high adaptability six-carbon polycarboxylate admixture prepared by the above preparation method has excellent comprehensive performance. Moreover, the preparation method can be carried out at room temperature and pressure, the operation is relatively simple, and it has good prospects for industrial application.

[0030] In one specific implementation scheme, in step (2), the dripping time of material A is 45-55 min, and the dripping time of material B is 40-50 min.

[0031] In summary, this application has the following beneficial effects:

[0032] 1. In this application, ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether are compounded in a specified ratio as a six-carbon macromonomer. The above-mentioned six-carbon macromonomer has high reactivity, which is beneficial to the polymerization reaction. Furthermore, the encapsulation and entanglement properties of the polyether side chains are improved, and the resulting polycarboxylic acid additive has strong adaptability and good slump retention and workability in actual use.

[0033] 2. In this application, acrylic acid and 2-nitroethyl acrylate are used as functional monomers. 2-nitroethyl acrylate introduces a hydrophobic and electronegative nitro group into the polycarboxylic acid molecular chain. In practical applications, under the influence of electronegativity and hydrophobicity, the polycarboxylic acid admixture tends to stay away from the soil, thereby effectively reducing the amount of adsorption of the polycarboxylic acid admixture by the soil, that is, the adaptability of the polycarboxylic acid admixture is enhanced.

[0034] 3. In this application, a silane coupling agent containing carbon-carbon double bonds is further added as a raw material. The silane coupling agent containing carbon-carbon double bonds participates in the system reaction, which promotes the formation of polycarboxylate admixtures with larger molecular sizes. In the actual use of polycarboxylate admixtures, it can increase the difficulty for polycarboxylate admixtures to enter the soil layers, thereby improving the adaptability of polycarboxylate admixtures. Detailed Implementation

[0035] The present application will be further described in detail below with reference to the embodiments and comparative examples. All raw materials involved in the present application can be obtained commercially.

[0036] Example 1

[0037] A highly adaptable hexacarbon polycarboxylate additive, comprising the following raw materials by weight:

[0038] 170g of six-carbon macromonomer, 15g of functional monomer, 6g of ester monomer, 3g of silane coupling agent containing carbon-carbon double bond, 4g of chain transfer agent, 2g of redox system initiator, 8g of pH adjuster, and 240g of water.

[0039] The six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl polyoxyethylene ether in a mass ratio of 3:1. The ethylene glycol monovinyl polyethylene glycol ether was purchased from Fushun Dongke Fine Chemical Co., Ltd., with a molecular weight of 3000; the 4-hydroxybutyl vinyl polyoxyethylene ether was purchased from Fushun Dongke Fine Chemical Co., Ltd., with a molecular weight of 4000.

[0040] The functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of 3:1. The 2-nitroethyl acrylate is prepared in-house, and the specific preparation method is as follows: 100g of 2-nitroethanol, 225g of acrylic acid, 30ml of concentrated sulfuric acid, 25g of cuprous chloride, and 900ml of toluene are mixed and heated under reflux for 3 hours in a nitrogen atmosphere. After the reaction is completed, heating is stopped and the mixture is cooled to room temperature. The product is washed with deionized water until the pH is neutral, then dried with anhydrous calcium chloride, filtered, and the filtrate is distilled under reduced pressure. The fraction with a boiling point of 90±2℃ is collected to obtain 2-nitroethyl acrylate.

[0041] The ester monomer is hydroxypropyl acrylate;

[0042] The silane coupling agent containing carbon-carbon double bonds is γ-methacryloxypropyltrimethoxysilane, purchased from Nanjing Xiangqian Chemical Co., Ltd., model KH570;

[0043] The chain transfer agent is mercaptoacetic acid;

[0044] The mass ratio of oxidant to reductant in the redox initiator is 14:1, and the oxidant is ammonium persulfate and the reductant is ferrous sulfate.

[0045] The pH adjuster is a 30% sodium hydroxide solution.

[0046] The preparation method of the above-mentioned highly adaptable six-carbon polycarboxylate admixture includes the following steps:

[0047] (1) Mix functional monomers, ester monomers, silane coupling agents containing carbon-carbon double bonds and water accounting for 1 / 3 of the total water volume to obtain material A; mix chain transfer agents, redox system initiators and water accounting for 1 / 5 of the total water volume to obtain material B;

[0048] (2) Mix the six-carbon macromonomer and the remaining water to obtain the base material; at the same time, add material A and material B dropwise to the base material. The dropwise addition time of material A is 55 min and the dropwise addition time of material B is 45 min. After the addition of material A and material B, react at room temperature for 1 h, and then add pH adjuster to adjust pH to 7 to obtain anti-slump type six-carbon polycarboxylic acid admixture.

[0049] The difference between Examples 2-5 and Example 1 lies in the different raw material ratios, as detailed in the table below.

[0050] Table 1 Raw Material Proportioning Table

[0051]

[0052] Example 6

[0053] The difference between this embodiment and Embodiment 1 is that the six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether in a mass ratio of 2:1.

[0054] Example 7

[0055] The difference between this embodiment and Embodiment 1 is that the six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether in a mass ratio of 5:1.

[0056] Example 8

[0057] The difference between this embodiment and Embodiment 1 is that the six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether in a mass ratio of 4:1.

[0058] Example 9

[0059] The difference between this embodiment and Example 1 is that the functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of 1:1.

[0060] Example 10

[0061] The difference between this embodiment and Example 1 is that the functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of 2:1.

[0062] Example 11

[0063] The difference between this embodiment and Embodiment 1 is that the molecular weight of ethylene glycol monovinyl polyethylene glycol ether is 4000, and the molecular weight of 4-hydroxybutylvinyl polyoxyethylene ether is 5000.

[0064] Example 12

[0065] The difference between this embodiment and Example 1 is that the ester monomer is dimethyl maleate.

[0066] Example 13

[0067] The difference between this embodiment and Embodiment 1 is that the silane coupling agent containing carbon-carbon double bonds is vinyltrimethoxysilane, purchased from Nanjing Xiangqian Chemical Co., Ltd., model A171.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 1 is that the six-carbon macromonomer is ethylene glycol monovinyl polyethylene glycol ether.

[0070] Comparative Example 2

[0071] The difference between this comparative example and Example 1 is that the six-carbon macromonomer is 4-hydroxybutylvinyl polyoxyethylene ether.

[0072] Comparative Example 3

[0073] The difference between this comparative example and Example 1 is that the six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether in a mass ratio of 1:1.

[0074] Comparative Example 4

[0075] The difference between this comparative example and Example 1 is that the six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutylvinyl polyoxyethylene ether in a mass ratio of 6:1.

[0076] Comparative Example 5

[0077] The difference between this comparative example and Example 1 is that the functional monomer is acrylic acid.

[0078] Comparative Example 6

[0079] The difference between this comparative example and Example 1 is that the functional monomer is 2-nitroethyl acrylate.

[0080] Comparative Example 7

[0081] The difference between this comparative example and Example 1 is that the functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of 1:2.

[0082] Comparative Example 8

[0083] The difference between this comparative example and Example 1 is that the functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of 4:1.

[0084] Comparative Example 9

[0085] The difference between this comparative example and Example 1 is that no silane coupling agent containing carbon-carbon double bonds is added.

[0086] Comparative Example 10

[0087] The difference between this comparative example and Example 1 is that an equal amount of γ-glycidoxypropyltrimethoxysilane was used to replace the silane coupling agent containing carbon-carbon double bonds.

[0088] Performance testing methods

[0089] 1. The fluidity of cement paste was tested according to GB / T 8077—2012 "Test Method for Homogeneity of Concrete Admixtures". The water-cement ratio was 0.29 and the water-reducing agent dosage was 0.18%. The water-reducing agents were prepared in Examples 1-13 and Comparative Examples 1-10, respectively. The cement used was Conch P.O42.5 cement.

[0090] Table 2. Cement paste fluidity test data.

[0091]

[0092] Based on the test data of cement paste fluidity in Table 2, the polycarboxylate admixtures obtained in each embodiment of this application can maintain an initial fluidity of over 280 mm when used in cement paste, and the fluidity fluctuation of cement paste is maintained within 30 mm after 1 hour. This indicates that the polycarboxylate admixtures obtained in each embodiment have a good dispersion effect on cement.

[0093] 2. The slump and spread of concrete were tested according to GB / T 50080—2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures". The concrete mix ratio used for the test is as follows: cement 300kg / m³ 3 100kg / m³ of fly ash 3 1062 kg / m³ of gravel 3 738 kg / m³ of manufactured sand 3 175 kg / m³ of water 3 The water-reducing agent content was 0.18% (converted to solid content); the water-reducing agent was prepared in Examples 1-13 and Comparative Examples 1-10, respectively; the cement was Conch P.O42.5 cement; the fly ash was secondary fly ash; the gravel was crushed stone with a particle size of 5-31.5 mm; the fineness modulus of the manufactured sand was 2.4-2.8; and the stone powder content was 20%.

[0094] Table 3. Concrete Performance Test Data

[0095]

[0096]

[0097] Based on the test data regarding concrete performance in Table 3, the polycarboxylate admixtures obtained in the various embodiments of this application, after being applied to concrete, resulted in an initial slump of over 220 mm and an initial spread of over 570 mm, indicating that the polycarboxylate admixtures obtained in the various embodiments of this application have excellent water-reducing effects. Furthermore, the slump of the concrete after 1 hour remained above 200 mm, and the spread after 1 hour remained above 540 mm, indicating that the polycarboxylate admixtures obtained in the various embodiments of this application have excellent slump retention and good workability.

[0098] Specifically, considering the test results of Example 1 and Comparative Examples 1-2, in Comparative Examples 1-2, ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl polyoxyethylene ether were used alone as six-carbon macromonomers, and the test results showed a significant decrease in the slump and spread of the concrete. This may be because there is a certain synergistic relationship between ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl polyoxyethylene ether, and the combined use of the two yields better results.

[0099] Specifically, considering the test results of Example 1 and Comparative Examples 5-6, in Comparative Example 5, where acrylic acid was used alone as the functional monomer, the slump and spread of the concrete decreased significantly compared to Example 1. This is because, without the addition of 2-nitroethyl acrylate, the resulting polycarboxylate admixture molecule lacks a hydrophobic electronegative nitro group, resulting in greater adsorption of the polycarboxylate admixture by the soil, thus significantly reducing its slump retention and workability. In Comparative Example 6, where 2-nitroethyl acrylate was used alone as the functional monomer, the slump and spread of the concrete still showed a significant decrease compared to Example 1. This may be because there is a certain synergistic relationship between acrylic acid and 2-nitroethyl acrylate, and the combined use yields better results.

[0100] Specifically, considering the test results of Example 1 and Comparative Examples 9-10, in Comparative Example 9, without the addition of a silane coupling agent containing carbon-carbon double bonds, both the slump and spread of the concrete showed a significant decrease. This is because, in the absence of a silane coupling agent containing carbon-carbon double bonds, the resulting polycarboxylate admixture has a smaller molecular size and is more easily adsorbed into the interlayer structure by the soil. In Comparative Example 10, even when a silane coupling agent without double bonds was used instead of one containing double bonds, the slump and spread of the concrete still decreased to some extent. This may be because the silane coupling agent containing carbon-carbon double bonds interacts better with other monomers, making it easier to obtain polycarboxylate admixtures with larger molecular sizes.

[0101] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A highly adaptable hexacarbon polycarboxylate additive, characterized in that, The raw materials include the following parts by weight: 150-200 parts of a six-carbon macromonomer, 10-20 parts of a functional monomer, 3-8 parts of an ester monomer, 2-5 parts of a silane coupling agent containing a carbon-carbon double bond, 1-5 parts of a chain transfer agent, 0.5-2 parts of a redox system initiator, 5-10 parts of a pH adjuster, and 200-300 parts of water. The six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl polyoxyethylene ether in a mass ratio of (2-5):1; The functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of (1-3):1; The carbon-carbon double bond-containing silane coupling agent includes at least one of vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane, γ-methacryloxypropyltrimethoxysilane, and vinyltriethoxysilane.

2. The highly adaptable hexacarbon polycarboxylate admixture according to claim 1, characterized in that, The raw materials include the following parts by weight: 170-180 parts of six-carbon macromonomer, 14-18 parts of functional monomer, 5-7 parts of ester monomer, 3-4 parts of silane coupling agent containing carbon-carbon double bond, 2-4 parts of chain transfer agent, 1-2 parts of redox system initiator, 6-9 parts of pH adjuster, and 230-260 parts of water. The six-carbon macromonomer is composed of ethylene glycol monovinyl polyethylene glycol ether and 4-hydroxybutyl vinyl polyoxyethylene ether in a mass ratio of (3-4):1; The functional monomer is composed of acrylic acid and 2-nitroethyl acrylate in a mass ratio of (2-3):

1.

3. The highly adaptable hexacarbon polycarboxylate admixture according to claim 1, characterized in that, The preparation method of the 2-nitroethyl acrylate is as follows: Mix 2-nitroethanol, acrylic acid, concentrated sulfuric acid, cuprous chloride and toluene, and heat under reflux for 2-4 hours in a nitrogen atmosphere. After the reaction is complete, wash the product with deionized water, dry it with a drying agent, filter it and then distill the filtrate under reduced pressure. Collect the fraction with a boiling point of 90±2℃ to obtain 2-nitroethyl acrylate.

4. The highly adaptable hexacarbon polycarboxylate admixture according to claim 1, characterized in that, The molecular weight of the ethylene glycol monovinyl polyethylene glycol ether is 3000-4000, and the molecular weight of the 4-hydroxybutylvinyl polyoxyethylene ether is 4000-5000.

5. The highly adaptable hexacarbon polycarboxylate admixture according to claim 1, characterized in that, The ester monomers include at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, methyl acrylate, dimethyl maleate, and diethyl maleate.

6. The highly adaptable hexacarbon polycarboxylate admixture according to claim 1, characterized in that, The chain transfer agent includes at least one of mercaptoacetic acid, mercaptopropionic acid, sodium hypophosphite, and mercaptoethanol.

7. The highly adaptable hexacarbon polycarboxylate admixture according to claim 1, characterized in that, The redox system initiator is composed of an oxidant and a reducing agent, with the mass ratio of the oxidant to the reducing agent being (10-18):

1. The oxidant includes at least one of hydrogen peroxide and persulfate, and the reducing agent includes at least one of sodium sulfite, ferrous sulfate, and ascorbic acid.

8. The method for preparing the highly adaptable six-carbon polycarboxylate admixture according to any one of claims 1 to 7, characterized in that, Includes the following steps: (1) Mix functional monomers, ester monomers, silane coupling agents containing carbon-carbon double bonds and water to obtain material A; mix chain transfer agents, redox system initiators and water to obtain material B; (2) Mix the six-carbon macromonomer and water to obtain the base material; at the same time, add material A and material B dropwise to the base material. After the addition of material A and material B, react at room temperature for 1-1.5 hours. Then add pH adjuster and mix to obtain anti-slump type six-carbon polycarboxylic acid admixture.

9. The method for preparing the highly adaptable six-carbon polycarboxylate admixture according to claim 8, characterized in that, In step (2), the dripping time of material A is 45-55 min, and the dripping time of material B is 40-50 min.

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