A mother liquor for an air-entraining slurry-lifting agent, its preparation method and application

Abstract

This invention discloses an air-entraining slurry-enhancing agent mother liquor with an interpenetrating network structure, its preparation method, and its application. The solid content of the air-entraining slurry-enhancing agent mother liquor is 35-45 wt%, and it is prepared from raw materials including the following components in parts by weight: 5-50 parts of polyoxyethylene macromonomer, 3-30 parts of unsaturated carboxylic acid and / or unsaturated anhydride, 0.3-6 parts of sodium α-olefin sulfonate, 0.003-7 parts of monoepoxy-terminated unsaturated compound, 0.001-2.5 parts of crosslinking agent, 0.3-1.5 parts of redox initiator composition, and water. The above raw materials form an interpenetrating network structure through polymerization reaction. When added to concrete, it can significantly improve the encapsulation of concrete mixture slurry, reduce the size of air droplets, inhibit the floating, dissipation, and aggregation of small air droplets in aggregate gaps, improve and maintain the homogeneous dispersion of small air droplets in concrete, improve the workability and workability of concrete, and significantly reduce the bulk density of concrete mixture and increase the fluidity of concrete while ensuring the design strength grade of concrete.

Description

Technical Field

[0001] This invention belongs to the field of concrete admixture technology, specifically relating to an air-entraining slurry-enhancing agent mother liquor, its preparation method, and its application. Background Technology

[0002] Cement concrete technology has undergone nearly 200 years of continuous accumulation, development, and improvement. The significant advancements in high-efficiency / high-performance water-reducing agent technology and social progress since the late 1970s have made ultra-long, ultra-high, and ultra-large volume concrete the mainstream material for concrete engineering. High-performance polycarboxylate superplasticizers have become a new generation of concrete admixtures due to their high water reduction rate and environmentally friendly production raw materials and processes. However, variations in the composition of concrete mixes, fine aggregates, and mineral powder admixtures can easily lead to bleeding, segregation, and bottoming phenomena in fresh concrete. Technicians typically improve the fullness of the concrete paste and its encapsulation of coarse aggregates by adjusting the water-cement ratio, changing the water-reducing agent dosage, and using additives (such as thickeners and air-entraining agents). This enhances the workability of the concrete, giving fresh concrete greater fluidity, anti-segregation stability, and good filling properties.

[0003] Hydroxypropyl methylcellulose, polyacrylic acid polymers, and plant gums are widely used in engineering as thickeners or water-retaining agents. Appropriate introduction of these components can significantly improve the encapsulation of aggregates in concrete mixtures, alleviate or improve segregation and bleeding, improve the workability and fluidity of fresh concrete, and enhance material stability. However, the interaction between thickeners and cement particles competes with that between polycarboxylate superplasticizers and cement particles. Furthermore, the entanglement between the molecular chains of thickeners interferes with the effectiveness of the superplasticizer, leading to a significant loss of fluidity in the concrete mixture within a short period, which is detrimental to construction and pouring. On the other hand, the use of air-entraining agents can improve the fullness and fluidity of concrete mixtures. However, concrete mixtures containing inferior air bubbles often experience aggregation and coalescence of small air bubbles after standing, transportation, loading, unloading, or pouring, resulting in bubble overflow, floating slurry, severely affecting the appearance of the project, and jeopardizing its quality and durability. Furthermore, studies show that a 1% increase in the air entrainment of concrete will lead to a decrease of about 5% in its 28-day compressive strength, directly affecting the hardening strength of concrete and negatively impacting its structure and durability. Summary of the Invention

[0004] The purpose of this invention is to provide an air-entraining slurry-enhancing agent mother liquor that reduces bubble aggregation while entraining air and enhancing slurry in concrete mixtures, as well as its preparation method and application.

[0005] The technical solution of the present invention is as follows:

[0006] A mother liquor for an air-entraining slurry-raising agent, having a solid content of 35-45 wt%, is prepared from raw materials comprising the following components in parts by weight:

[0007] 5-50 parts polyoxyethylene unsaturated macromonomer, 3-30 parts unsaturated carboxylic acid and / or unsaturated anhydride, 0.3-6 parts sodium α-olefin sulfonate, 0.003-7 parts monoepoxy-terminated unsaturated compound, 0.001-2.5 parts crosslinking agent, 0.3-1.5 parts redox initiating composition, 0.3-1.5 parts chain transfer agent, and 0.5-91 parts water;

[0008] The polyoxyethylene unsaturated macromonomers mentioned above are selected from at least one of allyl polyoxyethylene ether, methallyl polyoxyethylene ether, isopentenyl polyoxyethylene ether, polyoxyethylene acrylate, polyoxyethylene methacrylate and isopentenyl acid polyoxyethylene ester, and the number average molecular weight of the polyoxyethylene unsaturated macromonomers is 500-5000.

[0009] The above-mentioned monoepoxy-terminated unsaturated compounds are at least one of allyl glycidyl ether, methyl allyl glycidyl ether, isopentenyl glycidyl ether, glycidyl acrylate, glycidyl methacrylate, and glycidyl isopentenyl acid.

[0010] The above crosslinking agent is And / or H2N—X'—NH2, where R is H or CH3, R' is H or CH3, and X is (CH2). n1 Chain segment, (CH2CH2O) n2 A chain segment or ester segment, X' having (CH2) n3 Chain segment, (CH2CH2O) n4 The chain segment or ester chain segment, where n1, n2, n3, and n4 are integers;

[0011] In some possible implementations, the raw materials also include 0.01-1 parts by weight of chitosan, with a viscosity of 10-500 mPa·s.

[0012] In some possible implementations, the crosslinking agent is selected from at least one of diethanol dimethacrylate, polyethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate and 1,6-hexanediol dimethacrylate, diallyl glycol ether, diallyl polyethylene glycol ether, ethylenediamine, triethylene glycol diamine, decanediamine and butanediamine.

[0013] In some possible implementations, the redox initiating composition comprises an oxidant and a reductant, wherein the oxidant is ammonium persulfate and / or a peroxide, and the reductant is Fe. 2+ And / or vitamin C, the mass ratio of oxidizing agent to reducing agent is 1.5-3.75:1.

[0014] In some possible implementations, the chain transfer agent is mercaptoacetic acid and / or mercaptopropionic acid, with a mass ratio of chain transfer agent to reducing agent of 1:1.2-4.

[0015] In some possible implementations, the unsaturated carboxylic acid is selected from at least one of acrylic acid, methacrylic acid, and maleic acid;

[0016] The unsaturated anhydride is selected from at least one of acrylic anhydride, methacrylic anhydride, and maleic anhydride.

[0017] A method for preparing the above-mentioned air-entraining slurry extractant mother liquor includes the following steps:

[0018] (1) Dissolve 3-90% of polyoxyethylene unsaturated macromonomer, 5-75% of unsaturated carboxylic acid and / or unsaturated anhydride, 0-50% of monoepoxy-terminated unsaturated compound, 0-100% of sodium α-olefin sulfonate and part of crosslinking agent in an appropriate amount of water, add 30-70% of redox initiating composition and 30-70% of chain transfer agent in batches at room temperature, control the temperature of the reaction system to be no more than 60°C, add part of crosslinking agent after the temperature of the reaction system begins to drop, and obtain a solution of the first intermediate after the temperature of the reaction system begins to drop significantly. The total amount of crosslinking agent added in step (1) is 25-85%.

[0019] (2) Add the remaining amount of polyoxyethylene unsaturated macromonomer, unsaturated carboxylic acid and / or unsaturated acid anhydride, monoepoxy-terminated unsaturated compound, sodium α-alkenyl sulfonate, part of the crosslinking agent and appropriate amount of water to the first intermediate solution. Add the remaining amount of redox initiating composition and chain transfer agent at 30°C. Control the temperature of the reaction system to not exceed 60°C. After the temperature of the reaction system begins to decrease, add the remaining amount of crosslinking agent. After the temperature of the reaction system drops to room temperature, the solution of the second intermediate is obtained.

[0020] (3) Adjust the solid content of the solution of the second intermediate to 35-45 wt% to obtain the mother liquor of the air-entraining slurry extractant with an interpenetrating network structure;

[0021] In some possible implementations, the raw materials also include 0.01-1 parts by weight of chitosan, with a viscosity of 10-500 mPa·s;

[0022] Chitosan is added in at least one of steps (1), (2) and (3).

[0023] A concrete admixture composition comprising the above-mentioned air-entraining admixture mother liquor.

[0024] The present invention has at least the following beneficial effects:

[0025] 1. The raw materials of the air-entraining slurry enhancer mother liquor of the present invention form an interpenetrating network structure through polymerization reaction. When used in concrete, it can significantly improve the encapsulation of concrete mixture slurry, reduce the size of air droplets, inhibit the process of tiny air droplets floating, dispersing and agglomerating through the gaps between aggregates, improve and maintain the homogeneous dispersion of small air droplets in concrete, improve the workability and workability of concrete, and significantly reduce the bulk density of concrete mixture while ensuring the design strength grade of concrete.

[0026] 2. In some possible implementations, chitosan participates in the formation of interpenetrating networks or modifies interpenetrating networks, which can further improve the water retention and strength of concrete.

[0027] 3. When the air-entraining slurry-enhancing agent mother liquor of the present invention is compounded with other components to obtain a concrete admixture slurry-enhancing composition, it can improve the fullness of the concrete mixture slurry without reducing the hardening strength of the concrete. Furthermore, compared to concrete admixture slurry-enhancing compositions obtained by replacing existing triterpenoid saponin air-entraining agents, no additional thickener is required. Detailed Implementation

[0028] The technical solution of the present invention will be further explained and described below through specific embodiments.

[0029] In the following embodiments, the water used may be one or more of distilled water, purified water, drinking water, and tap water; unless otherwise specified, the detection methods in the following embodiments are conventional detection methods; unless otherwise specified, the reagents in the following embodiments are all purchased from commercial channels.

[0030] The degree of deacetylation of chitosan used in the following examples is 85%, while in other possible embodiments, the degree of deacetylation of chitosan is 85%-100%.

[0031] The high-performance polycarboxylate superplasticizer mother liquor used in the following examples is ZS-M90M produced by Zhongshi (Fujian) New Building Materials Technology Co., Ltd.; the silicone defoamer used in the following examples is silicone defoamer 611-c; the triterpenoid saponin air-entraining agent is also a commercially available product; the thickener is HPMC type with a viscosity of 100,000-200,000 (aq).

[0032] Example 1

[0033] (1) 120g of isopentenyl polyoxyethylene ether, 200g of methyl allyl polyoxyethylene ether, 55g of acrylic acid, and 4.8g of ethylene glycol dimethacrylate were dispersed and dissolved in 400g of water. After stirring and dissolving evenly, the redox initiating composition (0.85g of hydrogen peroxide and 0.5g of vitamin C) and 1.1g of mercaptopropionic acid were added dropwise to the monomer mixture in batches to initiate an aqueous polymerization reaction. The temperature of the reaction system was controlled not to exceed 60℃. When the temperature of the reaction system began to drop significantly, the first intermediate solution was obtained.

[0034] (2) Under stirring, add a mixture of 230g of isopentenyl polyoxyethylene ether, 100g of acrylic acid, 1.6g of 1,6-hexanediol dimethacrylate, 1.8g of glycidyl acrylate, 48g of sodium α-alkenyl sulfonate and 220g of water to the first intermediate solution. After stirring and dissolving evenly, add the redox initiating composition (2.9g of hydrogen peroxide and 1g of vitamin C) and the chain transfer agent 2.9g of mercaptopropionic acid dropwise to the monomer mixture solution in batches to initiate the polymerization reaction. Control the temperature of the reaction system to be no higher than 60℃. After the temperature of the reaction system begins to drop, adjust the pH to neutral. Then add 0.8g of ethylenediamine and continue stirring. When the temperature of the reaction system begins to drop significantly, the second intermediate solution is obtained.

[0035] (3) Add an appropriate amount of water to adjust the solid content of the second intermediate solution to 40wt% to obtain the mother liquor of the air-entraining slurry agent with an interpenetrating network structure.

[0036] Example 2

[0037] (1) Mix 280g of isopentenyl alcohol polyoxyethylene ether, 60g of acrylic acid, 10g of maleic anhydride, and 6g of polyethylene glycol dimethacrylate (M of polyethylene glycol). n =200), 40g of sodium α-alkenylsulfonate was dissolved in 450g of water. After stirring and dissolving evenly, the redox initiating composition (1.7g hydrogen peroxide, 7g vitamin C) and 2g mercaptopropionic acid were added dropwise to the monomer mixture in batches to initiate the polymerization reaction. The temperature of the reaction system was controlled not to exceed 60℃. When the temperature of the reaction system began to drop significantly, the first intermediate solution was obtained.

[0038] (2) Add a mixture of 410g of isopentenyl alcohol polyoxyethylene ether, 60g of acrylic acid, 2.8g of glycidyl methacrylate and 127.2g of water to the first intermediate solution under stirring. After stirring evenly, add the redox initiating composition (1.7g of hydrogen peroxide and 0.7g of vitamin C) and 2g of mercaptopropionic acid dropwise to the monomer mixture in batches. Control the temperature of the reaction system to not exceed 60°C. After the temperature of the reaction system begins to drop, adjust the pH to neutral. Then add 100g of an aqueous solution containing 1.2g of triethylene glycol diamine and 0.8g of chitosan. Continue stirring until the temperature of the reaction system drops to room temperature to obtain the second intermediate solution.

[0039] (3) Add an appropriate amount of water to adjust the solid content of the second intermediate solution to 40wt% to obtain the cross-linked air-entraining slurry mother liquor; the viscosity of the chitosan used is 150mPa·s.

[0040] Example 3

[0041] (1) Dissolve 280g of isopentenyl polyoxyethylene ether, 70g of acrylic acid, 3g of 1,6-hexanediol dimethacrylate and 40g of sodium α-alkenyl sulfonate in 260g of water. After stirring and dissolving evenly, add the redox initiating composition (1.5g of hydrogen peroxide and 0.7g of vitamin C) and 1g of mercaptopropionic acid dropwise to the aqueous solution of the mixed monomers in batches to initiate the polymerization reaction. Control the temperature of the reaction system to be no more than 60℃. When the temperature of the reaction system begins to drop significantly, the first intermediate solution is obtained.

[0042] (2) Add a mixture of 110g of isopentenyl polyoxyethylene ether, 200g of methyl allyl polyoxyethylene ester, 50g of acrylic acid, 10g of methacrylic acid, 3.2g of allyl glycidyl ether and 176.8g of water to the first intermediate solution under stirring. After stirring evenly, add the redox initiating composition (1.5g of hydrogen peroxide and 0.7g of vitamin C) and 1g of mercaptopropionic acid dropwise to the monomer mixture solution in batches. Control the temperature of the reaction system to not exceed 60℃. After the temperature of the reaction system begins to drop, adjust the pH to neutral. Then add 200g of chitosan aqueous solution, which contains 3.2g of chitosan with a viscosity of 150mPa·s. Continue stirring until the temperature of the reaction system drops to room temperature to obtain the second intermediate solution.

[0043] (3) Add an appropriate amount of water to adjust the solid content of the second intermediate solution to 40wt% to obtain the mother liquor of the air-entraining slurry agent with an interpenetrating network structure.

[0044] Example 4

[0045] (1) Dissolve 300g of isopentenyl polyoxyethylene ether, 55g of acrylic acid, 6g of allyl glycidyl ether and 15g of sodium α-alkenyl sulfonate in 400g of water. After stirring and dissolving evenly at room temperature, add the redox initiating composition (2.5g of hydrogen peroxide and 1.2g of vitamin C) and 2.8g of mercaptopropionic acid dropwise to the monomer mixture in batches to initiate the polymerization reaction. Control the temperature of the reaction system to be no higher than 60℃. After the temperature of the reaction system begins to drop, adjust the pH to neutral. Then add 10g of decanediamine. After the temperature of the reaction system begins to drop significantly, the first intermediate solution is obtained.

[0046] (2) Add 300g of isopentenyl polyoxyethylene ether, 50g of acrylic acid, 15g of maleic acid, 5.8g of isopentenyl glycidyl ether and 25g of sodium α-alkenyl sulfonate and 54.2g of water to the first intermediate solution under stirring. After stirring evenly, add the redox initiating composition (2.5g of hydrogen peroxide and 1.2g of vitamin C) and 2.8g of mercaptopropionic acid dropwise to the monomer mixture in batches to initiate the polymerization reaction and control the temperature of the reaction system to not exceed 60℃. After the temperature of the reaction system begins to drop, adjust the pH to neutral, and then add 2g of ethylenediamine and 4.5g of water-soluble chitosan (viscosity 300mPa·s). Continue stirring until the temperature of the reaction system drops to room temperature to obtain the second intermediate solution.

[0047] (3) Add an appropriate amount of water to adjust the solid content of the second intermediate solution to 40wt% to obtain the mother liquor of the air-entraining slurry agent with an interpenetrating network structure.

[0048] Example 5

[0049] (1) Dissolve 50g of acrylic acid, 140g of isopentenyl polyoxyethylene ether, 2g of 1,6-hexanediol dimethacrylate, and 70g of sodium α-alkenyl sulfonate in 260g of water. After stirring until homogeneous, use a redox initiating composition (2g of hydrogen peroxide and 0.9g of vitamin C) and 1.5g of mercaptopropionic acid as a chain transfer agent to initiate the polymerization reaction of the monomers. Control the reaction temperature to not exceed 60℃. After the temperature of the reactants begins to decrease significantly, the first intermediate solution is obtained.

[0050] (2) Under stirring, add a mixture of 250g of isopentenyl alcohol polyoxyethylene ether, 200g of polyoxyethylene acrylate, 65g of acrylic acid, 3.2g of glycidyl methacrylate and 433g of water to the first intermediate solution. After stirring evenly, add the redox initiating composition (2.5g of hydrogen peroxide and 1.5g of vitamin C) and 1.8g of mercaptopropionic acid dropwise to the monomer mixture in batches to initiate the polymerization reaction. Control the temperature of the reaction system to be no higher than 60°C. After the temperature of the reaction system begins to drop, adjust the pH to neutral. Then add 0.6g of butanediamine and 200g of chitosan aqueous solution, wherein the chitosan aqueous solution contains 2.5g of chitosan with a viscosity of 200mPa·s. Continue stirring until the temperature of the reaction system drops to room temperature to obtain the second intermediate solution.

[0051] (3) Add an appropriate amount of water to adjust the solid content of the second intermediate solution to 40wt% to obtain the mother liquor of the air-entraining slurry agent with an interpenetrating network structure.

[0052] Performance Testing: Concrete Admixture and its Performance Testing

[0053] Examples 6-10: The interpenetrating network structure air-entraining slurry-enhancing agent mother liquor obtained in Examples 1-5 was synthesized and set aside for later use. The air-entraining slurry-enhancing agent mother liquor, high-performance water-reducing mother liquor, sodium gluconate, defoamer, and water were compounded at a mass ratio of 3-10:22:1:0.02:69-78 and used as a concrete admixture slurry-enhancing composition; at the same time, commercially available air-entraining agents and thickening slurry-enhancing components were selected as controls to obtain the compounded concrete admixture slurry-enhancing composition.

[0054] Comparative Examples 1-4: The slurry composition of the control group was obtained by compounding high-performance carboxylic acid water-reducing agent mother liquor, triterpenoid saponin air-entraining agent, thickener, sodium gluconate, organosilicon defoamer and water in a mass ratio of 22:0-0.8:0-1:1:0.02:75.2-76.7.

[0055] The specific composition and proportions of Examples 6-10 and Comparative Examples 1-4 are shown in Table 1:

[0056] Table 1. Raw materials and mass ratios for Examples 6-10 and Examples 1-4

[0057]

[0058] Examples 6-10 and Comparative Examples 1-4 were incorporated into C30 concrete. Concrete mix design tests were conducted on C30 concrete with different compositions of the added slurry-enhancing composition. The test methods followed GB / T50080-2016. The unit weight and the strength of concrete specimens at 7 days and 28 days were tested. The results are shown in Table 2.

[0059] Table 2 Comparison of concrete density and strength using concrete-enhancing compositions with different formulations

[0060]

[0061] As can be seen from Table 2, when the air-entraining slurry-enhancing agent mother liquor of the present invention is compounded with other components to obtain a concrete slurry-enhancing composition, it can improve the fullness of the concrete mixture, reduce the concrete density and improve its compressive strength without reducing the hardening strength of the concrete.

[0062] The above are merely preferred embodiments of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A mother liquor for an air-entraining type slurry extracting agent, characterized in that, Its solid content is 35-45 wt% and it is made from raw materials including the following components in parts by weight: 5-50 parts polyoxyethylene unsaturated macromonomer, 3-30 parts unsaturated carboxylic acid and / or unsaturated anhydride, 0.3-6 parts sodium α-olefin sulfonate, 0.003-7 parts monoepoxy-terminated unsaturated compound, 0.001-2.5 parts crosslinking agent, 0.3-1.5 parts redox initiating composition, 0.3-1.5 parts chain transfer agent, and 0.5-91 parts water; The polyoxyethylene unsaturated macromonomers mentioned above are selected from at least one of allyl polyoxyethylene ether, methallyl polyoxyethylene ether, isopentenyl polyoxyethylene ether, polyoxyethylene acrylate, polyoxyethylene methacrylate and isopentenyl polyoxyethylene ester, and the number average molecular weight of the polyoxyethylene unsaturated macromonomers is 500-5000. The above-mentioned monoepoxy-terminated unsaturated compounds are at least one of allyl glycidyl ether, methyl allyl glycidyl ether, isopentenyl glycidyl ether, glycidyl acrylate, glycidyl methacrylate, and glycidyl isopentenyl acid. The above crosslinking agent is And / or H2N—X'—NH2, where R is H or CH3, R' is H or CH3, and X is (CH2). n1 Chain segment, (CH2CH2O) n2 A chain segment or ester segment, X' having (CH2) n3 Chain segment, (CH2CH2O) n4 The chain segment or ester chain segment, where n1, n2, n3, and n4 are integers.

2. The air-entraining type slurry-lifting agent mother liquor as described in claim 1, characterized in that, The raw materials also include 0.01-1 parts by weight of chitosan, wherein the viscosity of the chitosan is 10-500 mPa·s.

3. The air-entraining type slurry-lifting agent mother liquor as described in claim 1, characterized in that, The crosslinking agent is selected from at least one of diethanol dimethacrylate, polyethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate and 1,6-hexanediol dimethacrylate, diallyl glycol ether, diallyl polyethylene glycol ether, ethylenediamine, triethylene glycol diamine, decanediamine and butanediamine.

4. The air-entraining type slurry-lifting agent mother liquor as described in claim 1, characterized in that, The redox initiating composition comprises an oxidant and a reducing agent, wherein the oxidant is ammonium persulfate and / or a peroxide, and the reducing agent is Fe. 2+ And / or vitamin C, wherein the mass ratio of the oxidizing agent to the reducing agent is 1.5-3.75:

1.

5. The air-entraining type slurry-lifting agent mother liquor as described in claim 4, characterized in that, The chain transfer agent is mercaptoacetic acid and / or mercaptopropionic acid, and the mass ratio of the chain transfer agent to the reducing agent is 1:1.2-4.

6. The air-entraining type slurry-lifting agent mother liquor as described in claim 1, characterized in that, The unsaturated carboxylic acid is selected from at least one of acrylic acid, methacrylic acid and maleic acid; The unsaturated anhydride is selected from at least one of acrylic anhydride, methacrylic anhydride, and maleic anhydride.

7. A method for preparing the mother liquor of an air-entraining slurry-lifting agent as described in any one of claims 1-6, characterized in that, Includes the following steps: (1) Dissolve 3-90% of polyoxyethylene unsaturated macromonomer, 5-75% of unsaturated carboxylic acid and / or unsaturated anhydride, 0-50% of monoepoxy-terminated unsaturated compound, 0-100% of sodium α-olefin sulfonate and part of crosslinking agent in an appropriate amount of water, add 30-70% of redox initiating composition and 30-70% of chain transfer agent in batches at room temperature, control the temperature of the reaction system to be no greater than 60°C, add part of the crosslinking agent after the temperature of the reaction system begins to drop, and obtain a solution of the first intermediate after the temperature of the reaction system begins to drop significantly. The total amount of crosslinking agent added in step (1) is 25-85%. (2) Add the remaining amount of the polyoxyethylene unsaturated macromonomer, the unsaturated carboxylic acid or the unsaturated acid anhydride, the monoepoxy-terminated unsaturated compound, the sodium α-alkenyl sulfonate, part of the crosslinking agent and an appropriate amount of water to the first intermediate solution. Add the remaining amount of the redox initiating composition and the chain transfer agent at 30°C. Control the temperature of the reaction system to be no greater than 60°C. After the temperature of the reaction system begins to decrease, add the remaining amount of the crosslinking agent. After the temperature of the reaction system drops to room temperature, a solution of the second intermediate is obtained. (3) Adjust the solid content of the solution of the second intermediate to 35-45 wt% to obtain the mother liquor of the air-entraining slurry extractor.

8. The preparation method according to claim 7, characterized in that, The raw materials also include 0.01-1 parts by weight of chitosan, wherein the viscosity of the chitosan is 10-500 mPa·s; The chitosan is added in at least one of steps (1), (2) and (3).

9. A concrete admixture composition, characterized in that, Includes the air-entraining slurry extract mother liquor as described in any one of claims 1-6.

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