CN112708061B - Ester anti-corrosion polycarboxylate superplasticizer and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of building materials, in particular to an ester anticorrosive polycarboxylate superplasticizer and a preparation method thereof, wherein the ester anticorrosive polycarboxylate superplasticizer is prepared by carrying out polymerization reaction on a small monomer with anticorrosive function, an unsaturated ester macromonomer, unsaturated carboxylic acid and/or unsaturated carboxylic anhydride under the action of an initiator and a molecular weight regulator to generate the ester anticorrosive polycarboxylate superplasticizer with a main molecular chain connected with the small monomer with anticorrosive function, the ester anticorrosive polycarboxylate superplasticizer provided by the invention is an ester superplasticizer with anticorrosive effect, has good anticorrosive and water-reducing effects, has better workability and low sensitivity than an ether polycarboxylate superplasticizer when being used for concrete, and the finally obtained ester anticorrosive polycarboxylate superplasticizer product is a stable macromolecular structure, can bear high temperature higher than 50 ℃, has better high-temperature anticorrosive property, the raw materials used are wide in source, low in price and simple in preparation process, and have important practical application value.

Description

Ester anticorrosive polycarboxylate superplasticizer and preparation method thereof

Technical Field

The invention relates to the technical field of building materials, in particular to an ester anticorrosive polycarboxylate superplasticizer and a preparation method thereof.

Background

With the development and progress of modern science and technology, the scale of basic engineering construction is gradually enlarged, modern construction engineering develops to high-rise, super high-rise and large-span frame engineering, the demand on concrete is increased, and the performance requirements on pumping, segregation resistance and the like of the concrete are increased.

In concrete materials, admixtures, such as water reducing agents, are often used. The conventional method for solving the problem of mildew and odor of the polycarboxylate superplasticizer is a compound preservative, and some people also study the anti-corrosion polycarboxylate superplasticizer.

The method for adding the preservative in the compounding process is the method which is the most widely applied in the prior art, but the compounded preservative generally has a small molecular weight, so that on one hand, the problem that the preservative is not uniformly dispersed in the polycarboxylic acid water reducing agent can exist, and on the other hand, the conventional compound preservative used in the prior art can be decomposed and lose efficacy in the environment of higher than 50 ℃, and the application of the preservative is limited to a certain extent.

CN110642996A, published in 2020, 01, 03 days, discloses a self-preservation type polycarboxylate water reducer and a preparation method thereof, but monomers with preservation performance used in the self-preservation type polycarboxylate water reducer are any one or more of polymethacrylic acid acyloxy ethyl trimethyl ammonium chloride, poly [2- (acryloyloxy) ethyl ] trimethyl ammonium bromide, poly benzyl ethyl trimethyl ammonium chloride, poly allyl trimethyl ammonium chloride and poly (3-acrylamidopropyl) trimethyl ammonium bromide. However, these substances are polymers, have no polymerization activity and cannot be connected into the molecular structure of the water reducing agent, so the method is also a method for compounding the preservative in nature.

CN110128048A, published in 2019, 08 and 16 months, discloses a corrosion-resistant slump-retaining polycarboxylic acid water reducer for summer and a preparation method thereof, and also realizes the corrosion resistance by a method of compounding a bactericide (polyhexamethylene guanidine phosphate).

CN110015857A, published in 2019, 07, 16, discloses a preparation method and application of a straw-starch-based mixed modified compound polycarboxylate water reducer, dimethyl fumarate is directly compounded into a patent product as a preservative, but the water solubility of the dimethyl fumarate is not good, a large amount of water is generally required to be compounded and added in the actual use process of the polycarboxylate water reducer, and the water content is even higher than 90%, so the effect of directly compounding and adding the dimethyl fumarate is not ideal.

CN109796561A, with the publication time of 2019, 05, 24 and discloses a mother liquor of an aromatic ring polycarboxylic acid water reducing agent, a preparation method and application thereof.

CN109400819A, published for 03/01/2019, discloses a viscosity-reducing antibacterial amphoteric polycarboxylic acid high-efficiency water reducer and a preparation method thereof, wherein guanidine hydrochloride and alkyl compounds with amino groups at two ends are used for preparing antibacterial monomers, and the antibacterial monomers are used for synthesizing the polycarboxylic acid water reducer, so that the synthesis process is complex and the energy consumption is high.

CN108373526A, published in 2018, 08.07.2018, discloses an antifouling and antibacterial polycarboxylate water reducer and a preparation method thereof, wherein the antibacterial effect is realized by adding (methyl) acrylic acid sulfobetaine and methacryloyloxyethyl trimethyl ammonium chloride during polymerization, but the two monomers are higher in cost.

CN107698721A, published in 2018, 02, 16 and discloses a branched chain type antibacterial polycarboxylate superplasticizer, a preparation method and application thereof, but the preparation process is too complex and the production efficiency is low.

CN107265907A, published for 10 months and 20 days in 2017, discloses an amphoteric antibacterial polycarboxylic acid high-efficiency water reducing agent and a preparation method thereof, wherein copolymerization is carried out firstly, and then the amphoteric antibacterial polycarboxylic acid high-efficiency water reducing agent is sequentially reacted with unsaturated polyester macromonomer and halogen-terminated polyether, the process is complex, and the product conversion rate is limited due to the reaction of large molecular weight and macromolecules, so that the product performance is influenced.

CN105621927A, published 2016 (06, 01), discloses a preparation method of an antibacterial preservative for a polycarboxylic acid water reducer, wherein betaine and dimethyl fumarate monomers with antibacterial functions are introduced into polyoxyethylene ether with a similar structure of the polycarboxylic acid water reducer for free radical copolymerization reaction, so that the preservative is compatible with the polycarboxylic acid water reducer with a similar molecular structure. However, the product of the patent only has an antiseptic effect and does not have a water reducing effect, and the polymerization efficiency is low because dimethyl fumarate monomer and unsaturated monomer are directly polymerized in a system, so that the water solubility is poor, and the phase separation problem exists in the polymerization process.

Disclosure of Invention

In order to solve the problem of how to provide an ester anticorrosive polycarboxylate water reducer with excellent and stable anticorrosive effect in the background art, the invention provides an ester anticorrosive polycarboxylate water reducer, which is prepared by carrying out polymerization reaction on a small anticorrosive monomer, an unsaturated ester macromonomer, unsaturated carboxylic acid and/or unsaturated carboxylic anhydride under the action of an initiator and a molecular weight regulator to generate an ester anticorrosive polycarboxylate water reducer with a main molecular chain connected with the small anticorrosive monomer; the preservative functional small monomer is fumarate and/or maleate.

On the basis of the technical scheme, the mass ratio range of the unsaturated ester macromonomer, the preservative functional small monomer, the unsaturated carboxylic acid and/or the unsaturated carboxylic anhydride is 180: (1-15): (5-30).

On the basis of the technical scheme, further, the using amount of the initiator is 0.5-3.0% of the total mass of the reactants; the dosage of the molecular weight regulator is 0.2-3.0% of the total mass of the reactants.

On the basis of the technical scheme, in the polymerization reaction process, an initiator aqueous solution, a molecular weight regulator aqueous solution and an unsaturated carboxylic acid and/or unsaturated carboxylic anhydride aqueous solution are dropwise added within 2-6 hours, the reaction temperature is 30-90 ℃, heat preservation is carried out for 0.5-3 hours after dropwise addition, and alkali is added to adjust the pH value of a product to 5-7.

On the basis of the technical scheme, the initiator further comprises a water-soluble redox initiation system or a water-soluble peroxide initiation system reagent; specifically, hydrogen peroxide-ascorbic acid, hydrogen peroxide-sodium formaldehyde sulfoxylate and ammonium persulfate can be adopted;

the molecular weight regulator comprises at least one of thioglycolic acid, mercaptoethanol, mercaptopropionic acid, sulfonated mercaptopropionic acid and sodium hypophosphite.

On the basis of the technical scheme, the fumaric acid ester comprises monomethyl fumarate and monoethyl fumarate.

On the basis of the technical scheme, the maleate further comprises diethyl maleate, dimethyl maleate and dipropyl maleate.

On the basis of the technical scheme, the molecular weight of the unsaturated ester macromonomer is 600-6000.

On the basis of the technical scheme, the unsaturated ester macromonomer is at least one of methoxy polyethylene glycol methacrylate and methoxy polyethylene glycol acrylate.

In addition to the above technical solution, the unsaturated carboxylic acid and/or unsaturated carboxylic acid anhydride is at least one of acrylic acid, methacrylic acid, and maleic anhydride.

The invention also provides a preparation method of any of the ester anticorrosive polycarboxylate superplasticizers, which comprises the following steps:

adding an unsaturated esterified macromonomer, an anticorrosive small monomer and water into a reactor for stirring, after the materials are uniformly mixed, dropwise adding unsaturated carboxylic acid and/or unsaturated carboxylic anhydride, an initiator and a molecular weight regulator for 2-6 h at the reaction temperature of 30-90 ℃; after the dropwise addition is finished, preserving the heat for 0.5-3 h to obtain a copolymerization product;

and adding alkali into the obtained copolymerization product to adjust the pH value of the product to 5-7, thus obtaining the ester anticorrosive polycarboxylate superplasticizer.

According to the ester anticorrosive polycarboxylate water reducer provided by the invention, at least one monomer unit of fumarate and maleate is introduced into a product molecular structure in a copolymerization mode of an unsaturated ester macromonomer, an anticorrosive functional small monomer, unsaturated carboxylic acid and/or unsaturated carboxylic anhydride to obtain the ester anticorrosive polycarboxylate water reducer with anticorrosive performance, a small-molecular preservative does not need to be compounded, the problem of uneven distribution caused by poor compatibility of the preservative and the polycarboxylate water reducer is avoided, and the formed final product is a stable high-molecular structure, can tolerate a high temperature higher than 50 ℃, and has more excellent high-temperature anticorrosive performance.

The raw materials used in the invention have wide sources, low price and simple preparation process, so that the cost of the project product more meets the application requirement of the polycarboxylate superplasticizer, and the polycarboxylic acid water reducer has important practical application value.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention also provides a preparation example of the ester anticorrosive polycarboxylate superplasticizer as shown in the following:

example 1

(1) Adding 2.40g of monomethyl fumarate and 145.00g of water into a reactor, starting a stirrer and a temperature control device, starting dropwise adding a methacrylic acid, acrylic acid and methoxypolyethylene glycol methacrylate mixed aqueous solution with the molecular weight of 2100 (wherein 15.00g of methacrylic acid, 5.00g of acrylic acid, 180.00g of methoxypolyethylene glycol methacrylate, 20.00g of water), a hydrogen peroxide aqueous solution (1.50 g of hydrogen peroxide, 20.00g of water), a mercaptopropionic acid aqueous solution (0.80 g of mercaptopropionic acid, 20.00g of water), an ascorbic acid aqueous solution (0.40 g of ascorbic acid and 20.00g of water), reacting at the temperature of 40 ℃ for 3.0h, and preserving heat for 0.5h after dropwise adding to obtain a copolymerization product after the materials are uniformly mixed;

(2) and (2) adding 11g of 32% sodium hydroxide aqueous solution into the copolymerization product prepared in the step (1) to obtain the ester anticorrosive polycarboxylate superplasticizer, which is recorded as KZJ-1.

Example 2

(1) 2.50g of diethyl maleate and 145.00g of water were added to the reactor, starting a stirrer and a temperature control device, after the materials are uniformly mixed, beginning to dropwise add methacrylic acid, a mixed aqueous solution of methoxy polyethylene glycol methacrylate with the molecular weight of 1200 and methoxy polyethylene glycol methacrylate with the molecular weight of 2000 (wherein 22.00g of methacrylic acid, 60.00g of methoxy polyethylene glycol methacrylate with the molecular weight of 1200, 120.00g of methoxy polyethylene glycol methacrylate with the molecular weight of 2000, and 20.00g of water), an aqueous solution of hydrogen peroxide (wherein 1.70g of hydrogen peroxide and 20.00g of water), an aqueous solution of thioglycolic acid (wherein 0.90g of thioglycolic acid and 20.00g of water), an aqueous solution of ascorbic acid (wherein 0.40 g of ascorbic acid and 20.00g of water), the reaction temperature is 40 ℃, the dropwise adding time is 2.5 hours, and keeping the temperature for 1 hour after the dropwise adding is finished, so as to obtain a copolymerization product;

(2) and (2) adding 11g of 32% sodium hydroxide aqueous solution into the copolymerization product prepared in the step (1) to obtain the ester anticorrosive polycarboxylate superplasticizer, which is recorded as KZJ-2.

Example 3:

(1) adding 2.60g of monoethyl fumarate and 145.00g of water into a reactor, starting a stirrer and a temperature control device, starting to dropwise add a methacrylic acid and methoxy polyethylene glycol methacrylate mixed aqueous solution with molecular weight of 2000 (wherein 20.00g of methacrylic acid, 180.00g of methoxy polyethylene glycol methacrylate, 20.00g of water), an ammonium persulfate aqueous solution (wherein 5.10g of ammonium persulfate, 30.00g of water), a thioglycolic acid aqueous solution (wherein 1.50g of thioglycolic acid and 30.00g of water), reacting at 85 ℃, dropwise adding time of 3.0h, and preserving heat for 1h after dropwise adding to obtain a copolymerization product after uniformly mixing the materials;

(2) and (2) adding 9g of 32% sodium hydroxide aqueous solution into the copolymerization product prepared in the step (1) to obtain the ester anticorrosive polycarboxylate superplasticizer, which is recorded as KZJ-3.

Example 4:

(1) adding 0.50g of monomethyl fumarate, 1.50g of diethyl maleate, 2.00g of sodium hypophosphite and 150.00g of water into a reactor, starting a stirrer and a temperature control device, starting dropwise adding a mixed aqueous solution of acrylic acid and methoxy polyethylene glycol acrylate with the molecular weight of 1200 (18.00 g of acrylic acid, 180.00g of methoxy polyethylene glycol acrylate and 20.00g of water), an aqueous solution of hydrogen peroxide (1.80 g of hydrogen peroxide and 20.00g of water), an aqueous solution of mercaptoethanol (0.90 g of mercaptoethanol and 20.00g of water), an aqueous solution of ascorbic acid (0.40 g of ascorbic acid and 20.00g of water), keeping the temperature for 1 hour after dropwise adding is finished, and obtaining a copolymerization product;

(2) and (2) adding 9g of 32% sodium hydroxide aqueous solution into the copolymerization product prepared in the step (1) to obtain the ester anticorrosive polycarboxylate superplasticizer, which is recorded as KZJ-4.

Example 5:

(1) adding 2.00g of monomethyl fumarate, 1.00g of diethyl maleate, 3.00g of sodium hypophosphite and 150.00g of water into a reactor, starting a stirrer and a temperature control device, after the materials are uniformly mixed, beginning to dropwise add a mixed aqueous solution of methacrylic acid, acrylic acid, methoxy polyethylene glycol methacrylate with the molecular weight of 1200 and methoxy polyethylene glycol acrylate with the molecular weight of 2000 (wherein 10.00g of methacrylic acid, 12.00g of acrylic acid, 90.00g of methoxy polyethylene glycol methacrylate with the molecular weight of 1200, 90.00g of methoxy polyethylene glycol acrylate with the molecular weight of 2000 and 20.00g of water), a hydrogen peroxide aqueous solution (wherein 1.20g of hydrogen peroxide and 20.00g of water), a rongalite aqueous solution (wherein 0.30 g of rongalite and 20.00g of water) at the initial reaction temperature of 15 ℃ for 1.0h, controlling the temperature of the materials in the dropwise adding process to be less than or equal to 30 ℃, and keeping the temperature for 0.5h after dropwise adding, obtaining a copolymerization product;

(2) and (2) adding 11g of 32% sodium hydroxide aqueous solution into the copolymerization product prepared in the step (1) to obtain the ester anticorrosive polycarboxylate superplasticizer, which is recorded as KZJ-5.

Comparative example 1:

(1) adding 145.00g of water into a reactor, starting a stirrer and a temperature control device, starting to dropwise add a methacrylic acid, acrylic acid and methoxypolyethylene glycol methacrylate mixed aqueous solution with the molecular weight of 2100 (wherein 15.00g of methacrylic acid, 5.00g of acrylic acid, 180.00g of methoxypolyethylene glycol methacrylate, 20.00g of water), a hydrogen peroxide aqueous solution (1.50 g of hydrogen peroxide, 20.00g of water), a mercaptopropionic acid aqueous solution (0.80 g of mercaptopropionic acid, 20.00g of water), an ascorbic acid aqueous solution (0.40 g of ascorbic acid and 20.00g of water), reacting at the temperature of 40 ℃ for 3.0h, and preserving heat for 0.5h after dropwise addition to obtain a copolymerization product after the materials are uniformly mixed;

(2) and (2) adding 11g of 32% sodium hydroxide aqueous solution into the copolymerization product prepared in the step (1) to obtain a comparative sample, and marking as PCE-1.

Comparative example 2:

and mixing PCE-1 and monomethyl fumarate according to a mass ratio of 183: 1, compounding to obtain a comparative sample, and marking as PCE-2.

Comparative example 3:

PCE-1 and

the K350 preservative is 183: 1, and compounding to obtain a comparative sample PCE-3.

Comparative example 4:

(1) adding 2.66g of dimethyl fumarate and 145.00g of water into a reactor, starting a stirrer and a temperature control device, after the materials are uniformly mixed, dropwise adding a methacrylic acid, acrylic acid and methoxypolyethylene glycol methacrylate mixed aqueous solution with the molecular weight of 2100 (wherein 15.00g of methacrylic acid, 5.00g of acrylic acid, 180.00g of methoxypolyethylene glycol methacrylate, 20.00g of water), a hydrogen peroxide aqueous solution (1.50 g of hydrogen peroxide, 20.00g of water), a mercaptopropionic acid aqueous solution (0.80 g of mercaptopropionic acid, 20.00g of water), an ascorbic acid aqueous solution (wherein 0.40 g of ascorbic acid and 20.00g of water), reacting at the temperature of 40 ℃, dropwise adding time of 3.0h, and keeping the temperature for 0.5h after dropwise adding to obtain a copolymerization product;

(2) and (2) adding 11g of 32% sodium hydroxide aqueous solution into the copolymerization product prepared in the step (1) to obtain the ester anticorrosive polycarboxylate superplasticizer, and marking as PCE-4.

And (3) performance detection:

1. testing of concrete Properties

The ester type anticorrosive polycarboxylate superplasticizers prepared in examples 1 to 5 and the polycarboxylate superplasticizers prepared in comparative examples 1, 2, 3 and 4 were subjected to performance tests according to GB/T8076-2008, wherein the test results are shown in Table 1, and the test results are that the folded solid content is 0.20%:

TABLE 1 concrete test results

As shown in Table 1, the comparison result of PCE-1 and KZJ-1 shows that after monomethyl fumarate in KZJ-1 is removed, the water reducing rate and the compressive strength ratios of 3d, 7d and 28d of the product are not affected basically, and the comparison result of PCE-4 and KZJ-1 shows that the water reducing rate and the compressive strength ratios of 3d, 7d and 28d of the product are reduced slightly after the monomethyl fumarate and other substances in KZJ-1 are changed into dimethyl fumarate, and the product synthesized according to the technical scheme of the patent has higher water reducing rate and compressive strength ratios of 3d, 7d and 28 d.

2. Test of Corrosion resistance

The ester anti-corrosion polycarboxylate water reducing agents prepared in examples 1 to 5 and the polycarboxylate water reducing agents prepared in comparative examples 1, 2, 3 and 4 are diluted to be 15% in concentration, 1% of white sugar and 2% of sodium gluconate are added to be compounded to obtain final water reducing agent finished products, 300g of each finished product sample is placed in an open glass container with the same volume of 500ml, the finished products are heated to 50 ℃ and are kept at the constant temperature for 12 hours, then the finished products are placed in a constant temperature cabinet with the temperature of 30 ℃ for 15 days (d), 30d, 60d, 90d and 120d, the state of the samples (whether peculiar smell, turbidity or mildew exists or not) is observed at corresponding time, so that the anti-corrosion performance of the samples is compared, and the specific test results are shown in table 2.

TABLE 2 Corrosion protection Performance test results

As can be seen from Table 2, PCE-1 has already appeared in 30 days after having peculiar smell and mildewing, PCE-2 directly compounded with monomethyl fumarate has slightly better antiseptic effect than PCE-1, but also has peculiar smell and mildewing in 60 days after being compounded

The PCE-3 of the K350 preservative has the same preservative effect as the PCE-2 by replacing the amount of the synthesized monomethyl fumarate and other substances with dimethyl fumarate PCE-4, but the ester preservative polycarboxylate water reducer prepared in the embodiments 1 to 5 has a better preservative effect in an environment of 50 ℃ than a comparative example, which shows that the prepared ester preservative polycarboxylate water reducer has a highly stable structure, can resist high temperature higher than 50 ℃ and has more excellent high-temperature preservative property by introducing the monomethyl fumarate and/or unsaturated carboxylic anhydride into a product molecular structure in a polymerization mode through specific raw material and proportion matching.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. An ester anticorrosive polycarboxylate superplasticizer is characterized in that: the method comprises the following steps of carrying out polymerization reaction on a small monomer with an anticorrosion function, an unsaturated ester macromonomer, unsaturated carboxylic acid and/or unsaturated carboxylic anhydride under the action of an initiator and a molecular weight regulator to generate an ester anticorrosion polycarboxylate superplasticizer with a main molecular chain connected with the small monomer with the anticorrosion function;

the small monomer with the antiseptic function is fumarate and maleate;

the fumarate is at least one of monomethyl fumarate and monoethyl fumarate;

the unsaturated ester macromonomer is at least one of methoxy polyethylene glycol methacrylate and methoxy polyethylene glycol acrylate;

the mass ratio range of the unsaturated ester macromonomer, the small monomer with the anticorrosion function, the unsaturated carboxylic acid and/or the unsaturated carboxylic anhydride is 180: (1-15): (5-30).

2. The ester anti-corrosion polycarboxylate water reducer according to claim 1, characterized in that: the using amount of the initiator is 0.5-3.0% of the total mass of the reactants; the dosage of the molecular weight regulator is 0.2-3.0% of the total mass of the reactants.

3. The ester anti-corrosion polycarboxylate water reducer according to claim 1, characterized in that: in the polymerization reaction process, an initiator aqueous solution, a molecular weight regulator aqueous solution and an unsaturated carboxylic acid and/or unsaturated carboxylic anhydride aqueous solution are dropwise added within 2-6 h, the reaction temperature is 30-90 ℃, heat preservation is carried out for 0.5-3 h after dropwise addition is finished, and alkali is added to adjust the pH value of a product to 5-7.

4. The ester anti-corrosion polycarboxylate water reducer according to claim 1, characterized in that: the initiator comprises a water-soluble redox initiation system or a water-soluble peroxide initiation system reagent;

the molecular weight regulator comprises at least one of thioglycolic acid, mercaptoethanol, mercaptopropionic acid, sulfonated mercaptopropionic acid and sodium hypophosphite.

5. The ester anti-corrosion polycarboxylate water reducer according to claim 1, characterized in that: the maleic acid ester is at least one of diethyl maleate, dimethyl maleate and dipropyl maleate.

6. The ester anti-corrosion polycarboxylate water reducer according to claim 1, characterized in that: the molecular weight of the unsaturated ester macromonomer is 600-6000.

7. The ester anti-corrosion polycarboxylate water reducer according to claim 1, characterized in that: the unsaturated carboxylic acid and/or unsaturated carboxylic acid anhydride is at least one of acrylic acid, methacrylic acid and maleic anhydride.

8. The preparation method of the ester anti-corrosion polycarboxylate superplasticizer according to any one of claims 1 to 7 is characterized by comprising the following steps:

adding an unsaturated esterified macromonomer, an anticorrosive small monomer and water into a reactor for stirring, after the materials are uniformly mixed, dropwise adding unsaturated carboxylic acid and/or unsaturated carboxylic anhydride, an initiator and a molecular weight regulator for 2-6 h at the reaction temperature of 30-90 ℃; after the dropwise addition is finished, preserving the heat for 0.5-3 h to obtain a copolymerization product;

and adding alkali into the obtained copolymerization product to adjust the pH value of the product to 5-7, thus obtaining the ester anticorrosive polycarboxylate superplasticizer.