Polycarboxylate-type water reducer and preparation method thereof
By combining modified talc powder with specific monomers and additives, a polycarboxylate superplasticizer was prepared, which solved the problem of poor compatibility of polycarboxylate superplasticizer in different cement systems, improved fluidity and dispersibility, and enhanced the stability and mechanical properties of concrete.
Patent Information
- Application Number
- CN202511207554.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2025-12-23
AI Technical Summary
Polycarboxylate superplasticizers have poor compatibility in different cement systems, resulting in large differences in dispersibility and holding capacity. Furthermore, concrete suffers severe slump loss during transportation, affecting its fluidity and mechanical strength.
A polycarboxylate superplasticizer was prepared by combining modified talc powder with specific monomers and additives via solution free radical polymerization. This enhanced the superplasticizer's affinity and dispersibility with cement. Modifying components such as serine and vanillin were added to improve its fluidity and stability.
It improves the fluidity, dispersibility and mechanical strength of polycarboxylate superplasticizer, enhances its compatibility with cement, reduces slump loss, and improves the overall performance of concrete.
Smart Images
Figure BDA0005568147370000091
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of polycarboxylate superplasticizers, and relates to a polycarboxylate superplasticizer and its preparation method. Background Technology
[0002] Polycarboxylate superplasticizers significantly improve the flowability and workability of concrete, and are widely used in large-scale infrastructure projects such as subways, bridges, nuclear power plants, and hydropower stations, becoming the leading product in the field of concrete superplasticizers. Due to the significant differences in concrete raw materials, the slump of concrete often drops rapidly during hot weather or long-distance transportation. In practical engineering, retarders such as sodium gluconate, sugar, and sodium hexametaphosphate are often used in combination, but these retarders cannot completely solve the problem of slump loss and may also cause problems such as concrete segregation, delayed bleeding, and spoilage.
[0003] Polycarboxylate superplasticizers are generally prepared through solution free radical polymerization. For example, through the free radical polymerization of monomers containing unsaturated double bonds and their derivatives, comb-like polycarboxylate copolymers with a main chain and multiple branches are formed. The main chain of this copolymer contains hydrophilic functional groups such as carboxyl, hydroxyl, sulfonic acid, and amino groups, while the side chains are grafted with polyoxyethylene (propylene) with different degrees of polymerization.
[0004] Polycarboxylate superplasticizers face several challenges in use: First, they exhibit poor compatibility with different cement systems, leading to significant variations in dispersibility and retention. Second, a polycarboxylate superplasticizer may perform well in one cement system but rapidly lose its fluidity or experience increased fluidity over time in others. Furthermore, other raw materials in concrete, such as talc and fly ash, can also affect the performance of polycarboxylate superplasticizers. Summary of the Invention
[0005] The purpose of this invention is to provide a polycarboxylate superplasticizer and its preparation method. The superplasticizer prepared by this invention, when added to concrete, has excellent fluidity and dispersibility, and also has good mechanical strength.
[0006] The objective of this invention can be achieved through the following technical solutions:
[0007] A polycarboxylate-based water-reducing agent comprises the following components in parts by weight:
[0008] The composition includes 35-45 parts isopentenyl polyoxyethylene ether, 8-10 parts acrylic acid, 6-8 parts acrylate monomer, 3.2-4.0 parts modified talc, 6-8 parts sodium lignosulfonate, 1.2-1.5 parts sodium gluconate, 22-28 parts ethylene glycol monovinyl polyethylene glycol ether, 0.5-0.7 parts ammonium persulfate, 0.1-0.2 parts methyl ethyl ketone peroxide, 0.2-0.4 parts sodium hydrosulfide, 1.8-2.2 parts chain transfer agent, and 90-100 parts deionized water.
[0009] As a preferred embodiment of the present invention, the isopentenyl polyoxyethylene ether has an average molecular weight of 2500; the ethylene glycol monovinyl polyethylene glycol ether has an average molecular weight of 3500.
[0010] As a preferred embodiment of the present invention, the acrylate monomer is composed of hydroxyethyl acrylate, butyl acrylate and hydroxypropyl acrylate mixed in a mass ratio of 3.0-3.5:2.0-2.2:1.5-1.8.
[0011] As a preferred embodiment of the present invention, the chain transfer agent is one or both of mercaptoethanol and mercaptoacetic acid.
[0012] This invention discloses a method for preparing the modified talc powder, comprising the following steps:
[0013] Step 1: Soak talc powder in an acidic solution, filter to obtain the solid, wash, dry, grind and sieve to obtain activated talc powder;
[0014] Step 2: Add activated talc powder to deionized water and mix well. Then add serine and sonicate the mixture. Filter the solid and freeze-dry it to obtain composite particles.
[0015] Step 3: Under an inert atmosphere, the composite particles and ethanol solution are mixed, the reaction monomer is added, and the mixture is heated and stirred. After filtration, washing, and vacuum drying, the product is obtained.
[0016] As a preferred embodiment of the present invention, in step one, the soaking time is 50-60 minutes; the washing is performed with deionized water until the solid surface is neutral; the drying is performed at 80-90°C until constant weight; the sieving is performed through a 180-200 mesh sieve; the volume ratio of talc powder to acidic solution is 1:6-7; the particle size of the talc powder is 4-8 μm; and the acidic solution is an 18% hydrochloric acid aqueous solution.
[0017] As a preferred embodiment of the present invention, in step two, the ultrasonic treatment is performed at a power of 600-800W for 40-50 minutes; the mass ratio of activated talc, deionized water and serine is 10-12:40-50:0.8-1.2.
[0018] As a preferred embodiment of the present invention, in step three, the inert atmosphere is a nitrogen atmosphere; the heating and stirring is performed by stirring at a microwave power of 300-400W for 20-30 seconds and then continuing to stir at a temperature of 50-60℃ for 4-5 hours; the washing is performed by washing three times with anhydrous ethanol and then washing twice with deionized water; the vacuum drying is performed by vacuum drying at a temperature of 80-90℃ to constant weight; the mass ratio of the composite particles, ethanol solution and reaction monomer is 13-15:70-80:2.7-3.2; the mass fraction of the ethanol solution is 70%; the reaction monomer is composed of 2-furan acrolein and vanillin in a mass ratio of 3.0-3.3:2.1-2.5.
[0019] This invention discloses a method for preparing a polycarboxylate-based water-reducing agent, comprising the following steps:
[0020] S1. Mix isopentenyl polyoxyethylene ether, modified talc, ethylene glycol monovinyl polyethylene glycol ether, sodium lignosulfonate, sodium gluconate, chain transfer agent and 70% of total deionized water to obtain solution A.
[0021] S2. After mixing acrylic acid, acrylate monomer, ammonium persulfate, methyl ethyl ketone peroxide and 30% of total deionized water, solution B is obtained.
[0022] S3. Slowly add solution B to solution A, heat and stir, add sodium hydrosulfide and stir to mix, then adjust the pH value to obtain the final product.
[0023] As a preferred embodiment of the present invention, in step S3, the heating and stirring are carried out at a temperature of 50-60°C for 1.5-2.0 hours; the stirring and mixing time is 10-15 minutes; and the pH value is adjusted to 7.
[0024] The beneficial effects of this invention are:
[0025] The water-reducing agent prepared by this invention, when added to concrete, exhibits excellent fluidity and dispersibility, as well as good mechanical strength. This invention improves the adsorption performance and dispersibility of talc powder by modifying it, thereby enhancing its affinity with the slow-release polycarboxylate water-reducing agent. This results in good fluidity and dispersibility, allowing the water-reducing agent to better exert its slow-release and water-reducing effects, while simultaneously improving mechanical properties. Detailed Implementation
[0026] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.
[0027] Example 1
[0028] A polycarboxylate-based water-reducing agent comprises the following components in parts by weight:
[0029] The ingredients are: 35 parts isopentenyl polyoxyethylene ether, 8 parts acrylic acid, 6 parts acrylate monomer, 3.2 parts modified talc, 6 parts sodium lignosulfonate, 1.2 parts sodium gluconate, 22 parts ethylene glycol monovinyl polyethylene glycol ether, 0.5 parts ammonium persulfate, 0.1 parts methyl ethyl ketone peroxide, 0.2 parts sodium hydrosulfide, 1.8 parts chain transfer agent, and 90 parts deionized water.
[0030] The isopentenyl polyoxyethylene ether has an average molecular weight of 2500; the ethylene glycol monovinyl polyethylene glycol ether has an average molecular weight of 3500; the acrylate monomer is a mixture of hydroxyethyl acrylate, butyl acrylate and hydroxypropyl acrylate in a mass ratio of 3.0:2.0:1.5; the chain transfer agent is mercaptoacetic acid;
[0031] The preparation method of the modified talc powder includes the following steps:
[0032] Step 1: Soak talc powder in an acidic solution, filter to obtain the solid, wash, dry, grind and sieve to obtain activated talc powder; wherein, the soaking time is 50 min; the washing is with deionized water until the solid surface is neutral; the drying is at 80℃ to constant weight; the sieving is through an 180 mesh sieve; the volume ratio of talc powder to acidic solution is 1:6; the particle size of the talc powder is 4 μm; the acidic solution is an 18% hydrochloric acid aqueous solution;
[0033] Step 2: Add activated talc powder to deionized water and mix well. Then add serine and sonicate the mixture. Filter the solid and freeze-dry it to obtain composite particles. The sonication is performed at 600W for 40 minutes. The mass ratio of activated talc powder, deionized water and serine is 10:40:0.8.
[0034] Step 3: Under an inert atmosphere, the composite particles and ethanol solution are mixed, and the reactant monomer is added. After heating and stirring, the mixture is filtered, washed, and vacuum dried to obtain the final product. The inert atmosphere is a nitrogen atmosphere. The heating and stirring are performed by stirring at 300W microwave power for 20 seconds, followed by stirring at 50℃ for 4 hours. The washing is performed by washing three times with anhydrous ethanol and then twice with deionized water. The vacuum drying is performed at 80℃ to constant weight. The mass ratio of the composite particles, ethanol solution, and reactant monomer is 13:70:2.7. The mass fraction of the ethanol solution is 70%. The reactant monomer consists of 2-furanopropenal and vanillin in a mass ratio of 3.0:2.1.
[0035] A method for preparing a polycarboxylate-based water-reducing agent includes the following steps:
[0036] S1. Mix isopentenyl polyoxyethylene ether, modified talc, ethylene glycol monovinyl polyethylene glycol ether, sodium lignosulfonate, sodium gluconate, chain transfer agent and 70% of total deionized water to obtain solution A.
[0037] S2. After mixing acrylic acid, acrylate monomer, ammonium persulfate, methyl ethyl ketone peroxide and 30% of total deionized water, solution B is obtained.
[0038] S3. Slowly add solution B to solution A, heat and stir, add sodium hydrosulfide and stir to mix, then adjust the pH value to obtain the final product; wherein, the heating and stirring is carried out at 50°C for 1.5 hours; the stirring and mixing time is 10 minutes; and the pH value is adjusted to 7.
[0039] Example 2
[0040] A polycarboxylate-based water-reducing agent comprises the following components in parts by weight:
[0041] The ingredients are: 40 parts isopentenyl polyoxyethylene ether, 9 parts acrylic acid, 7 parts acrylate monomer, 3.6 parts modified talc, 7 parts sodium lignosulfonate, 1.4 parts sodium gluconate, 25 parts ethylene glycol monovinyl polyethylene glycol ether, 0.6 parts ammonium persulfate, 0.15 parts methyl ethyl ketone peroxide, 0.3 parts sodium hydrosulfide, 2 parts chain transfer agent, and 95 parts deionized water.
[0042] The isopentenyl polyoxyethylene ether has an average molecular weight of 2500; the ethylene glycol monovinyl polyethylene glycol ether has an average molecular weight of 3500; the acrylate monomer is a mixture of hydroxyethyl acrylate, butyl acrylate and hydroxypropyl acrylate in a mass ratio of 3.2:2.1:1.6; the chain transfer agent is mercaptoacetic acid;
[0043] The preparation method of the modified talc powder includes the following steps:
[0044] Step 1: Soak talc powder in an acidic solution, filter to obtain the solid, wash, dry, grind and sieve to obtain activated talc powder; wherein, the soaking time is 55 min; the washing is with deionized water until the solid surface is neutral; the drying is at 85℃ to constant weight; the sieving is through a 190 mesh sieve; the volume ratio of talc powder to acidic solution is 1:6.5; the particle size of the talc powder is 6 μm; the acidic solution is an 18% hydrochloric acid aqueous solution;
[0045] Step 2: Add activated talc powder to deionized water and mix well. Then add serine and sonicate the mixture. Filter the solid and freeze-dry it to obtain composite particles. The sonication is performed at 700W for 45 minutes. The mass ratio of activated talc powder, deionized water and serine is 11:45:1.
[0046] Step 3: Under an inert atmosphere, the composite particles and ethanol solution are mixed, the reactant monomer is added, and the mixture is heated and stirred. The mixture is then filtered, washed, and vacuum dried to obtain the final product. The inert atmosphere is a nitrogen atmosphere. The heating and stirring are performed by stirring at 350W microwave power for 25 seconds, followed by stirring at 55℃ for 4.5 hours. The washing is performed by washing three times with anhydrous ethanol and then twice with deionized water. The vacuum drying is performed at 85℃ until constant weight. The mass ratio of the composite particles, ethanol solution, and reactant monomer is 14:75:3. The mass fraction of the ethanol solution is 70%. The reactant monomer consists of 2-furanopropenal and vanillin in a mass ratio of 3.2:2.3.
[0047] A method for preparing a polycarboxylate-based water-reducing agent includes the following steps:
[0048] S1. Mix isopentenyl polyoxyethylene ether, modified talc, ethylene glycol monovinyl polyethylene glycol ether, sodium lignosulfonate, sodium gluconate, chain transfer agent and 70% of total deionized water to obtain solution A.
[0049] S2. After mixing acrylic acid, acrylate monomer, ammonium persulfate, methyl ethyl ketone peroxide and 30% of total deionized water, solution B is obtained.
[0050] S3. Slowly add solution B to solution A, heat and stir, add sodium hydrosulfide and stir to mix, then adjust the pH value to obtain the final product; wherein, the heating and stirring is carried out at 55°C for 1.8 hours; the stirring and mixing time is 12 minutes; and the pH value is adjusted to 7.
[0051] Example 3
[0052] A polycarboxylate-based water-reducing agent comprises the following components in parts by weight:
[0053] The ingredients are: 45 parts isopentenyl polyoxyethylene ether, 10 parts acrylic acid, 8 parts acrylate monomer, 4.0 parts modified talc, 8 parts sodium lignosulfonate, 1.5 parts sodium gluconate, 28 parts ethylene glycol monovinyl polyethylene glycol ether, 0.7 parts ammonium persulfate, 0.2 parts methyl ethyl ketone peroxide, 0.4 parts sodium hydrosulfide, 2.2 parts chain transfer agent, and 100 parts deionized water.
[0054] The isopentenyl polyoxyethylene ether has an average molecular weight of 2500; the ethylene glycol monovinyl polyethylene glycol ether has an average molecular weight of 3500; the acrylate monomer is a mixture of hydroxyethyl acrylate, butyl acrylate and hydroxypropyl acrylate in a mass ratio of 3.5:2.2:1.8; the chain transfer agent is mercaptoacetic acid;
[0055] The preparation method of the modified talc powder includes the following steps:
[0056] Step 1: Soak talc powder in an acidic solution, filter to obtain the solid, wash, dry, grind and sieve to obtain activated talc powder; wherein, the soaking time is 60 min; the washing is with deionized water until the solid surface is neutral; the drying is at 90℃ to constant weight; the sieving is through a 200 mesh sieve; the volume ratio of talc powder to acidic solution is 1:7; the particle size of the talc powder is 8 μm; the acidic solution is an 18% hydrochloric acid aqueous solution;
[0057] Step 2: Add activated talc powder to deionized water and mix well. Then add serine and sonicate the mixture. Filter the solid and freeze-dry it to obtain composite particles. The sonication is performed at 800W for 50 minutes. The mass ratio of activated talc powder, deionized water and serine is 12:50:1.2.
[0058] Step 3: Under an inert atmosphere, the composite particles and ethanol solution are mixed, and the reactant monomer is added. After heating and stirring, the mixture is filtered, washed, and vacuum dried to obtain the final product. The inert atmosphere is a nitrogen atmosphere. The heating and stirring are performed by stirring at 400W microwave power for 30 seconds, followed by stirring at 60℃ for 5 hours. The washing is performed by washing three times with anhydrous ethanol and then twice with deionized water. The vacuum drying is performed at 90℃ until constant weight. The mass ratio of the composite particles, ethanol solution, and reactant monomer is 15:80:3.2. The mass fraction of the ethanol solution is 70%. The reactant monomer consists of 2-furanopropenal and vanillin in a mass ratio of 3.3:2.5.
[0059] A method for preparing a polycarboxylate-based water-reducing agent includes the following steps:
[0060] S1. Mix isopentenyl polyoxyethylene ether, modified talc, ethylene glycol monovinyl polyethylene glycol ether, sodium lignosulfonate, sodium gluconate, chain transfer agent and 70% of total deionized water to obtain solution A.
[0061] S2. After mixing acrylic acid, acrylate monomer, ammonium persulfate, methyl ethyl ketone peroxide and 30% of total deionized water, solution B is obtained.
[0062] S3. Slowly add solution B to solution A, heat and stir, add sodium hydrosulfide and stir to mix, then adjust the pH value to obtain the final product; wherein, the heating and stirring is carried out at 60°C for 2.0 h; the stirring and mixing time is 15 min; and the pH value is adjusted to 7.
[0063] Comparative Example 1
[0064] Compared with Example 3, Comparative Example 1 differs in that step one is omitted, and talc powder is used instead of the activated talc powder in step two. The remaining components, preparation steps and parameters are the same.
[0065] Comparative Example 2
[0066] Compared with Example 3, Comparative Example 2 differs in that serine is not used in step two, while the other components, preparation steps and parameters are the same.
[0067] Comparative Example 3
[0068] Compared with Example 3, Comparative Example 3 differs in that the reaction monomer in step three is 2-furan acrolein, while the other components, preparation steps and parameters are the same.
[0069] Comparative Example 4
[0070] Compared with Example 3, Comparative Example 4 differs in that the reaction monomer in step three is vanillin, while the other components, preparation steps and parameters are the same.
[0071] Comparative Example 5
[0072] Compared with Example 3, Comparative Example 5 differs in that the heating and stirring in step three is carried out at 60°C for 5 hours, while the other components, preparation steps and parameters are the same.
[0073] The water-reducing agents prepared in Examples 1-3 and Comparative Examples 1-5 were tested for the following properties, and the test results are shown in Table 1.
[0074] Performance testing: According to GB 8076-2008 Concrete Admixtures, the water-reducing agent content (converted to solids) is 0.16%;
[0075] Table 1
[0076]
[0077] As can be seen from the test results in Table 1, compared with Comparative Examples 1-5, the water-reducing agent prepared by the present invention, when added to concrete, has excellent fluidity and dispersibility, and also has good mechanical strength.
[0078] This invention uses talc as a reinforcing filler, and after treatment with an acidic solution, it obtains more active sites. Simultaneously, a composite polymer of serine, vanillin, and furanopropenal is used as a modifying component. This component improves the overall flowability and compatibility of the product, as well as the stability, appearance, flowability, and mechanical strength of the water-reducing agent. Through the hydroxyl, carboxyl, and amino groups of serine, this invention increases the repulsive force between concrete particles, enhancing the compatibility of talc and improving the dispersibility of the water-reducing agent. Ultrasonic stimulation promotes the flow and adhesion of serine to the talc, while microwave stimulation promotes the chemical reaction between serine and the aldehyde groups, significantly increasing the grafting rate of vanillin and furanopropenal. The benzene ring and ether bond in vanillin, combined with the carbon-carbon double bond in furanopropenal, increase the functionality of the polycarboxylate water-reducing agent system and the crosslinking density of the polymer. The acrolein phase also increases the compatibility of talc in the system, thereby improving the stability and mechanical strength of the water-reducing agent. The introduction of hydrophobic furan ring and benzene ring structures not only enhances the steric hindrance effect of the water-reducing agent, but also improves its adsorption capacity on the surface of cement particles, thereby dispersing cement particles more effectively.
[0079] This invention utilizes the furan ring structure of furanyl acrolein combined with the benzene ring structure of vanillin to achieve high thermal stability. The presence of both restricts the thermal movement of the polymer chain at high temperatures, thus maintaining structural integrity at high temperatures. This significantly enhances the overall heat resistance while preserving the dispersing effect of the water-reducing agent.
[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A polycarboxylate superplasticizer, characterized in that, The following components are included by weight: The composition includes 35-45 parts of isopentenyl polyoxyethylene ether, 8-10 parts of acrylic acid, 6-8 parts of acrylate monomer, 3.2-4.0 parts of modified talc, 6-8 parts of sodium lignosulfonate, 1.2-1.5 parts of sodium gluconate, 22-28 parts of ethylene glycol monovinyl polyethylene glycol ether, 0.5-0.7 parts of ammonium persulfate, 0.1-0.2 parts of methyl ethyl ketone peroxide, 0.2-0.4 parts of sodium hydrosulfide, 1.8-2.2 parts of chain transfer agent, and 90-100 parts of deionized water. The preparation method of the modified talc powder includes the following steps: Step 1: Soak talc powder in an acidic solution, filter to obtain the solid, wash, dry, grind and sieve to obtain activated talc powder; Step 2: Add activated talc powder to deionized water and mix well. Then add serine and sonicate the mixture. Filter the solid and freeze-dry it to obtain composite particles. Step 3: Under an inert atmosphere, the composite particles and ethanol solution are mixed, the reaction monomer is added, and the mixture is heated and stirred. After filtration, washing, and vacuum drying, the product is obtained.
2. The polycarboxylate superplasticizer according to claim 1, characterized in that: The isopentenyl polyoxyethylene ether has an average molecular weight of 2500; the ethylene glycol monovinyl polyethylene glycol ether has an average molecular weight of 3500.
3. The polycarboxylate superplasticizer according to claim 1, characterized in that: The acrylate monomer is composed of hydroxyethyl acrylate, butyl acrylate and hydroxypropyl acrylate in a mass ratio of 3.0-3.5:2.0-2.2:1.5-1.
8.
4. The polycarboxylate superplasticizer according to claim 1, characterized in that: The chain transfer agent is one or both of mercaptoethanol and mercaptoacetic acid.
5. A polycarboxylate superplasticizer according to claim 1, characterized in that: In step one, the soaking time is 50-60 minutes; the washing is done with deionized water until the solid surface is neutral; the drying is done at 80-90℃ to constant weight; the sieving is done through a 180-200 mesh sieve; the volume ratio of talc powder to acidic solution is 1:6-7; the particle size of the talc powder is 4-8 μm; and the acidic solution is an 18% hydrochloric acid aqueous solution.
6. The polycarboxylate superplasticizer according to claim 1, characterized in that: In step two, the ultrasonic treatment is performed at a power of 600-800W for 40-50 minutes; the mass ratio of activated talc, deionized water and serine is 10-12:40-50:0.8-1.
2.
7. A polycarboxylate superplasticizer according to claim 1, characterized in that: In step three, the inert atmosphere is a nitrogen atmosphere; the heating and stirring is to stir at a microwave power of 300-400W for 20-30s and then continue stirring at a temperature of 50-60℃ for 4-5h; the washing is to wash three times with anhydrous ethanol and then wash twice with deionized water; the vacuum drying is to vacuum dry to constant weight at a temperature of 80-90℃.
8. A polycarboxylate superplasticizer according to claim 1, characterized in that: In step three, the mass ratio of the composite particles, ethanol solution, and reaction monomer is 13-15:70-80:2.7-3.2; the mass fraction of the ethanol solution is 70%; and the reaction monomer is composed of 2-furan acrolein and vanillin in a mass ratio of 3.0-3.3:2.1-2.
5.
9. A method for preparing a polycarboxylate superplasticizer according to any one of claims 1 to 8, characterized in that, The preparation method includes the following steps: S1. Mix isopentenyl polyoxyethylene ether, modified talc, ethylene glycol monovinyl polyethylene glycol ether, sodium lignosulfonate, sodium gluconate, chain transfer agent and 70% of total deionized water to obtain solution A. S2. After mixing acrylic acid, acrylate monomer, ammonium persulfate, methyl ethyl ketone peroxide and 30% of total deionized water, solution B is obtained. S3. Slowly add solution B to solution A, heat and stir, add sodium hydrosulfide and stir to mix, then adjust the pH value to obtain the final product.
10. The method for preparing a polycarboxylate superplasticizer according to claim 9, characterized in that: In step S3, the heating and stirring are carried out at a temperature of 50-60℃ for 1.5-2.0h; the stirring and mixing time is 10-15min; and the pH value is adjusted to 7.