Cement grinding aid, its preparation method and application

Abstract

The application provides a cement grinding aid, a preparation method and application thereof, and belongs to the technical field of cement. NH2-UiO-66 is prepared, MA-NH2-UiO-66 is prepared by reacting with maleic anhydride, monomer 1 prepared from maleic anhydride and diethanolamine, monomer 2 prepared from maleic anhydride and diol, and silane coupling agent and allyl polyoxyethylene ether are polymerized to prepare the cement grinding aid. The cement grinding aid prepared by the application not only can improve the cement particle distribution, stimulate the hydration dynamics, improve the early strength and late strength of cement and the like, but also is beneficial to improving the grinding process in the cement production process, and has important roles in reducing energy consumption and improving energy use efficiency, and has wide application prospects.

Description

Technical Field

[0001] This invention relates to the field of cement technology, specifically to a cement grinding aid, its preparation method, and its application. Background Technology

[0002] Cement grinding aids are chemical additives that improve the grinding effect and performance of cement. They can be adsorbed onto the surface of cement particles and exert their effects through physical and chemical interactions. They can increase the hourly output of cement while maintaining the fineness of the ground cement and the mill power, or increase the specific surface area of ​​the cement and improve the particle size distribution while maintaining the cement output and mill power, thereby improving the strength and other quality indicators of the cement. In addition, they can significantly reduce energy consumption, improve its fluidity, increase the utilization rate of industrial waste, and reduce environmental pollution, thus possessing significant economic and social benefits and a promising development prospect.

[0003] Currently, the main components of commercially available grinding aids are amine organic compounds, polyol organic compounds, and inorganic salts. These liquid grinding aids, which are compounded from a variety of small molecules, have many drawbacks when used. Their grinding ability has an upper limit, and they are prone to causing a wide particle distribution range in cement products, resulting in coarse products, which leads to a decrease in cement strength and may even affect the cement strength grade.

[0004] Patent document CN102134300B discloses a functionalized, tunable amphoteric polycarboxylate-based cement grinding aid, specifically prepared by free radical polymerization of 80-100 parts of unsaturated polyether, 4-6 parts of unsaturated sulfonic acid, and 10-30 parts of unsaturated acid. The unsaturated polyether is one of allyl polyoxyethylene ether or methyl alkenyl polyoxyethylene ether; the unsaturated acid is one of acrylic acid, methacrylic acid, or maleic anhydride; and the unsaturated sulfonic acid is one of sodium methpropylene sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, or sodium vinyl sulfonate.

[0005] Patent document CN103193936B discloses an alcohol amine-carboxylic acid polymer cement grinding aid, specifically obtained by free radical polymerization of N-methyldiethanolamine maleate and isopentenyl alcohol polyoxyethylene ether.

[0006] The aforementioned existing technologies are all carboxylic acid polymer cement grinding aids. Carboxylic acid polymers have a comb-like molecular structure, which has a steric hindrance effect, preventing particles from approaching each other during cement grinding and thus preventing particle agglomeration. However, although carboxylic acid polymers can achieve good grinding aid effects and have good compatibility with other cement additives such as water-reducing agents, their effect on improving cement strength is not significant, and sometimes they may even have a negative effect on strength. Summary of the Invention

[0007] The purpose of this invention is to propose a cement grinding aid, its preparation method, and its application. This cement grinding aid not only improves the distribution of cement particles and stimulates hydration dynamics, and enhances the early and later strength of cement, but also improves the grinding process in cement production. Furthermore, it plays an important role in reducing energy consumption and improving energy efficiency, and has broad application prospects.

[0008] The technical solution of this invention is implemented as follows:

[0009] This invention provides a method for preparing a cement grinding aid, comprising preparing NH2-UiO-66, reacting it with maleic anhydride to obtain MA-NH2-UiO-66, and polymerizing it with monomer 1 obtained from maleic anhydride and diethanolamine, monomer 2 obtained from maleic anhydride and diol, a silane coupling agent, and allyl polyoxyethylene ether to obtain the cement grinding aid.

[0010] As a further improvement to the present invention, the following steps are included:

[0011] S1. Dissolve zirconium chloride and 2-aminoterephthalic acid in a solvent, add acetic acid, heat and stir to react, cool to room temperature, filter, wash, and dry to obtain NH2-UiO-66;

[0012] S2. Dissolve maleic anhydride in a solvent, add NH2-UiO-66, stir to react, filter, wash, and dry to obtain MA-NH2-UiO-66;

[0013] S3. Dissolve maleic anhydride in a solvent, add diethanolamine, stir the reaction, remove the solvent under reduced pressure, and obtain monomer 1;

[0014] S4. Dissolve maleic anhydride in a solvent, add glycol and catalyst, heat and stir to react, remove solvent under reduced pressure to obtain monomer 2;

[0015] S5. Acrylic acid, MA-NH2-UiO-66, monomer 1, monomer 2, silane coupling agent and allyl polyoxyethylene ether are added to water, stirred and mixed evenly, initiator is added, heated and stirred to react, solvent is removed under reduced pressure to obtain cement grinding aid.

[0016] As a further improvement of the present invention, the molar ratio of zirconium chloride and 2-aminoterephthalic acid in step S1 is 1:1, the temperature of the heating and stirring reaction is 120-130°C, and the time is 20-24h.

[0017] As a further improvement of the present invention, the mass ratio of maleic anhydride and NH2-UiO-66 in step S2 is 10:18-22, and the stirring reaction time is 2-4 hours.

[0018] As a further improvement of the present invention, the molar ratio of maleic anhydride and diethanolamine in step S3 is 1:1.9-2.1, and the stirring reaction time is 2-4 hours.

[0019] As a further improvement of the present invention, the molar ratio of maleic anhydride and diol in step S4 is 1:1.9-2.1, the catalyst is concentrated sulfuric acid, and the amount added is 2-3 wt% of the total mass of the system. The heating and stirring reaction temperature is 120-130℃, and the time is 3-5 h. The diol is at least one of ethylene glycol, propylene glycol, and butanediol.

[0020] As a further improvement of the present invention, in step S5, the mass ratio of acrylic acid, MA-NH2-UiO-66, monomer 1, monomer 2, silane coupling agent, allyl polyoxyethylene ether, and initiator is 5-7:3-5:2-3:1-2:2-3:5-7:0.01-0.05. The initiator is selected from at least one of sodium persulfate, potassium persulfate, and ammonium persulfate. The heating and stirring reaction temperature is 65-75°C, and the time is 4-6 hours. The silane coupling agent is a silane coupling agent with double bonds, selected from at least one of KH570, A151, and A171.

[0021] As a further improvement to the present invention, the specific steps include:

[0022] S1. Dissolve 1 molar equivalent of zirconium chloride and 1 molar equivalent of 2-aminoterephthalic acid in N,N-dimethylformamide, add acetic acid, heat to 120-130℃, stir and react for 20-24h, cool to room temperature, filter, wash, and dry to obtain NH2-UiO-66.

[0023] S2. Dissolve 10 parts by weight of maleic anhydride in N,N-dimethylformamide, add 18-22 parts by weight of NH2-UiO-66, stir the reaction for 2-4 hours, filter, wash, and dry to obtain MA-NH2-UiO-66.

[0024] S3. Dissolve 1 molar equivalent of maleic anhydride in N,N-dimethylformamide, add 1.9-2.1 molar equivalents of diethanolamine, stir the reaction for 2-4 hours, remove the solvent under reduced pressure, and obtain monomer 1;

[0025] S4. Dissolve 1 molar equivalent of maleic anhydride in a solvent, add 1.9-2.1 molar equivalents of diol and concentrated sulfuric acid, the amount of concentrated sulfuric acid added being 2-3 wt% of the total mass of the system, heat to 120-130℃, stir the reaction for 3-5 h, remove the solvent under reduced pressure to obtain monomer 2.

[0026] S5. Add 5-7 parts by weight of acrylic acid, 3-5 parts by weight of MA-NH2-UiO-66, 2-3 parts by weight of monomer 1, 1-2 parts by weight of monomer 2, 2-3 parts by weight of silane coupling agent and 5-7 parts by weight of allyl polyoxyethylene ether to water, stir and mix evenly, add 0.01-0.05 parts by weight of initiator, heat to 65-75℃, stir and react for 4-6 hours, remove solvent under reduced pressure to obtain cement grinding aid.

[0027] The present invention further protects a cement grinding aid prepared by the above-described preparation method.

[0028] This invention further protects the application of the above-mentioned cement grinding aid in the preparation of high-strength, high-wear-resistant cement.

[0029] The present invention has the following beneficial effects:

[0030] This invention prepares a metal-organic framework material with amino groups, which has good wear resistance and mechanical strengthening properties. It reacts with maleic anhydride to form a coupling compound, which can promote the hydration of cement minerals, stimulate the potential activity of the admixture, improve the early or late strength of concrete or mortar, and improve the setting time.

[0031] This invention prepares monomers 1 and 2, which, compared to directly adding diethanolamine and glycol as grinding aids, have a synergistic effect. However, these grinding aids have poor stability, fluctuating performance, and narrow applicability. Furthermore, they can affect the later strength of cement, limiting their widespread application. Based on these functional groups, this invention prepares a class of organic-inorganic combined polymeric grinding aids. The synergistic effect of multiple functional groups improves cement grinding dispersion and hydration induction, resulting in more stable application performance. At the same time, it can also improve the later strength of cement, which is significantly better than existing technologies. It also has advantages such as low effective dosage, significant grinding enhancement effect, low cost, and significant improvement in fineness performance, and has broad application prospects.

[0032] The grinding aid of this invention introduces an organosilane structure, which is a semi-organic and semi-inorganic polymer compound with the dual characteristics of organic and inorganic polymers. It has a variety of excellent properties such as high and low temperature resistance, weather aging resistance, ozone resistance, electrical insulation, non-toxicity and odorlessness, and physiological inertness. At the same time, it also has a comb-shaped molecular structure, and multiple functional groups make the molecular structure more stable. Moreover, the molecule can be anchored on the surface of cement particles, and has good dispersibility and fineness.

[0033] The cement grinding aid prepared by this invention is a recyclable green raw material, enabling clean production and use without generating harmful waste gas, wastewater, or solid waste residue. The polymer of this grinding aid has a comb-like structure, effectively eliminating and reducing agglomeration, allowing more energy generated during cement production to be used for crushing cement particles, resulting in more uniform and finer particles, thereby improving cement grinding efficiency and reducing cement energy consumption. Because of its long polyether side chains, and the presence of Si-O bonds and various functional groups such as hydroxyl and carboxyl groups in the short chains, it can easily adsorb onto the surface of cement particles. The negative charge in the molecules causes electrostatic repulsion between particles, dispersing them and preventing crack healing. Furthermore, the high surface activity and dispersibility of the Si-O bonds effectively reduce the free energy of the cement particle surface, allowing the long polyether side chains to exert a greater steric hindrance effect, further enhancing the dispersion performance of cement particles and accelerating crack propagation.

[0034] Furthermore, the cement grinding aid prepared by this invention has the function of activating and inducing the hydration activity of cement admixtures, enhancing the performance of cement, and extending its service life. The electrostatic repulsion effect generated by the negative charge in the polymer, combined with the steric hindrance effect of the long polyether side chains, plays an important role in reducing the interfacial tension of water and promoting the lubrication effect between cement particles. This allows water to fully penetrate into the tiny gaps between cement particles, thereby improving the flowability of cement.

[0035] The cement grinding aid prepared by this invention not only enables the cement grinding aid to improve the distribution of cement particles and stimulate hydration dynamics, and improve the early and later strength of cement, but also helps to improve the grinding process in cement production. Moreover, it plays an important role in reducing energy consumption and improving energy utilization efficiency, and has broad application prospects. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] This embodiment provides a method for preparing a cement grinding aid, specifically including the following steps:

[0039] S1. Dissolve 10 mmol zirconium chloride and 10 mmol 2-aminoterephthalic acid in 100 mL N,N-dimethylformamide, add 5 mL acetic acid, heat to 120 °C, stir and react for 20 h, cool to room temperature, filter, wash and dry to obtain NH2-UiO-66.

[0040] S2. Dissolve 1g of maleic anhydride in 200mL of N,N-dimethylformamide, add 1.8g of NH2-UiO-66, stir for 2h, filter, wash, and dry to obtain MA-NH2-UiO-66;

[0041] S3. Dissolve 10 mmol of maleic anhydride in 100 mL of N,N-dimethylformamide, add 19 mmol of diethanolamine, stir for 2 h, remove the solvent under reduced pressure, and obtain monomer 1.

[0042] S4. Dissolve 10 mmol of maleic anhydride in a solvent, add 19 mmol of ethylene glycol and concentrated sulfuric acid (the amount of concentrated sulfuric acid added is 2 wt% of the total mass of the system), heat to 120 °C, stir and react for 3 h, remove the solvent under reduced pressure to obtain monomer 2.

[0043] S5. Add 5g acrylic acid, 3g MA-NH2-UiO-66, 2g monomer 1, 1g monomer 2, 2g silane coupling agent A171 and 5g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.01g initiator, heat to 65℃, stir and react for 4h, remove solvent under reduced pressure to obtain cement grinding aid.

[0044] Example 2

[0045] This embodiment provides a method for preparing a cement grinding aid, specifically including the following steps:

[0046] S1. Dissolve 10 mmol zirconium chloride and 10 mmol 2-aminoterephthalic acid in 100 mL N,N-dimethylformamide, add 5 mL acetic acid, heat to 130 °C, stir and react for 24 h, cool to room temperature, filter, wash and dry to obtain NH2-UiO-66.

[0047] S2. Dissolve 1g of maleic anhydride in 200mL of N,N-dimethylformamide, add 2.2g of NH2-UiO-66, stir and react for 4h, filter, wash, and dry to obtain MA-NH2-UiO-66;

[0048] S3. Dissolve 10 mmol of maleic anhydride in 100 mL of N,N-dimethylformamide, add 21 mmol of diethanolamine, stir the reaction for 4 h, remove the solvent under reduced pressure, and obtain monomer 1.

[0049] S4. Dissolve 10 mmol of maleic anhydride in a solvent, add 21 mmol of 1,2-butanediol and concentrated sulfuric acid, the amount of concentrated sulfuric acid added is 3 wt% of the total mass of the system, heat to 130 °C, stir for 5 h, remove the solvent under reduced pressure to obtain monomer 2.

[0050] S5. Add 7g acrylic acid, 5g MA-NH2-UiO-66, 3g monomer 1, 2g monomer 2, 3g silane coupling agent A151 and 7g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.05g initiator, heat to 75℃, stir and react for 6h, remove solvent under reduced pressure to obtain cement grinding aid.

[0051] Example 3

[0052] This embodiment provides a method for preparing a cement grinding aid, specifically including the following steps:

[0053] S1. Dissolve 10 mmol zirconium chloride and 10 mmol 2-aminoterephthalic acid in 100 mL N,N-dimethylformamide, add 5 mL acetic acid, heat to 125 °C, stir and react for 22 h, cool to room temperature, filter, wash and dry to obtain NH2-UiO-66.

[0054] S2. Dissolve 1g of maleic anhydride in 200mL of N,N-dimethylformamide, add 2g of NH2-UiO-66, stir and react for 3h, filter, wash, and dry to obtain MA-NH2-UiO-66;

[0055] S3. Dissolve 10 mmol of maleic anhydride in 100 mL of N,N-dimethylformamide, add 20 mmol of diethanolamine, stir for 3 h, remove the solvent under reduced pressure, and obtain monomer 1.

[0056] S4. Dissolve 10 mmol of maleic anhydride in a solvent, add 20 mmol of 1,3-propanediol and concentrated sulfuric acid, the amount of concentrated sulfuric acid added is 2.5 wt% of the total mass of the system, heat to 125 °C, stir and react for 4 h, remove the solvent under reduced pressure to obtain monomer 2.

[0057] S5. Add 6g acrylic acid, 4g MA-NH2-UiO-66, 2.5g monomer 1, 1.5g monomer 2, 2.5g silane coupling agent KH570 and 6g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.03g initiator, heat to 70℃, stir and react for 5h, remove solvent under reduced pressure to obtain cement grinding aid.

[0058] Comparative Example 1

[0059] The difference from Example 3 is that MA-NH2-UiO-66 was not added in step S5.

[0060] Specifically as follows:

[0061] S5. Add 10g acrylic acid, 2.5g monomer 1, 1.5g monomer 2, 2.5g silane coupling agent KH570 and 6g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.03g initiator, heat to 70℃, stir and react for 5h, remove solvent under reduced pressure to obtain cement grinding aid.

[0062] Comparative Example 2

[0063] The difference from Example 3 is that monomer 1 was not added in step S5.

[0064] Specifically as follows:

[0065] S5. Add 6g acrylic acid, 4g MA-NH2-UiO-66, 4g monomer 2, 2.5g silane coupling agent KH570 and 6g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.03g initiator, heat to 70℃, stir and react for 5h, remove solvent under reduced pressure to obtain cement grinding aid.

[0066] Comparative Example 3

[0067] The difference from Example 3 is that monomer 2 was not added in step S5.

[0068] Specifically as follows:

[0069] S5. Add 6g acrylic acid, 4g MA-NH2-UiO-66, 4g monomer 1, 2.5g silane coupling agent KH570 and 6g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.03g initiator, heat to 70℃, stir and react for 5h, remove solvent under reduced pressure to obtain cement grinding aid.

[0070] Comparative Example 4

[0071] The difference from Example 3 is that monomer 1 and monomer 2 were not added in step S5.

[0072] Specifically as follows:

[0073] S5. Add 10g acrylic acid, 4g MA-NH2-UiO-66, 2.5g silane coupling agent KH570 and 6g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.03g initiator, heat to 70℃, stir and react for 5h, remove solvent under reduced pressure to obtain cement grinding aid.

[0074] Comparative Example 5

[0075] The difference from Example 3 is that the silane coupling agent KH570 was not added in step S5.

[0076] Specifically as follows:

[0077] S5. Add 8.5g acrylic acid, 4g MA-NH2-UiO-66, 2.5g monomer 1, 1.5g monomer 2 and 6g allyl polyoxyethylene ether to 100mL of water, stir and mix for 10min, add 0.03g initiator, heat to 70℃, stir and react for 5h, remove solvent under reduced pressure to obtain cement grinding aid.

[0078] Test Example 1

[0079] The cement grinding aids prepared in Examples 1-3 and Comparative Examples 1-5 of this invention were tested according to the national standard GB / T26748-2011.

[0080] Clinker was crushed to a particle size of less than 5 mm using a jaw crusher. Each batch consisted of 5 kg of clinker, with a ratio of 95% clinker and 5% desulfurized gypsum. Triethanolamine was added in the same manner. The cement grinding aid prepared in Examples 1-3 and Comparative Examples 1-5 of this invention was then ground in a standard 500 mm × 500 mm test mill and compared with a blank. The mixing amount of the grinding aid was 0.03%. During the test, the filling amount and gradation of the steel balls and steel segments in the mill remained unchanged, and the same grinding time was maintained: 25 min for grinding and 5 min for discharging. Cement fineness was tested according to the negative pressure sieve method in GB / T1345-2005 "Test Method for Fineness of Cement". The specific surface area of ​​cement was tested using a DBT-127 Blaine air permeability specific surface area meter. Cement mortar strength was tested according to GB / T17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)".

[0081] The results are shown in Table 1.

[0082] Table 1

[0083]

[0084] As can be seen from the table above, after the cement grinding aids prepared in Examples 1-3 of this invention are mixed, the specific surface area of ​​the cement is increased and the mechanical strength is also significantly improved.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a cement grinding aid, characterized in that, Includes the following steps: S1. Zirconium chloride and 2-aminoterephthalic acid are dissolved in a solvent, acetic acid is added, the mixture is heated and stirred to react, cooled to room temperature, filtered, washed, and dried to obtain NH2-UiO-66; the molar ratio of zirconium chloride to 2-aminoterephthalic acid is 1:

1. S2. Dissolve maleic anhydride in a solvent, add NH2-UiO-66, stir to react, filter, wash, and dry to obtain MA-NH2-UiO-66; the mass ratio of maleic anhydride to NH2-UiO-66 is 10:18-22. S3. Dissolve maleic anhydride in a solvent, add diethanolamine, stir to react, remove the solvent under reduced pressure, and obtain monomer 1; the molar ratio of maleic anhydride to diethanolamine is 1:1.9-2.1; S4. Maleic anhydride is dissolved in a solvent, glycol and catalyst are added, the mixture is heated and stirred to react, and the solvent is removed under reduced pressure to obtain monomer 2; the molar ratio of maleic anhydride to glycol is 1:1.9-2.1; the catalyst is concentrated sulfuric acid, and the glycol is at least one of ethylene glycol, propylene glycol, and butanediol; S5. Acrylic acid, MA-NH2-UiO-66, monomer 1, monomer 2, silane coupling agent, and allyl polyoxyethylene ether are added to water, stirred and mixed evenly, an initiator is added, the mixture is heated and stirred to react, and the solvent is removed under reduced pressure to obtain a cement grinding aid; the mass ratio of acrylic acid, MA-NH2-UiO-66, monomer 1, monomer 2, silane coupling agent, allyl polyoxyethylene ether, and initiator is 5-7:3-5:2-3:1-2:2-3:5-7:0.01-0.05, and the silane coupling agent is a silane coupling agent with double bonds, selected from at least one of KH570, A151, and A171.

2. The preparation method according to claim 1, characterized in that, The heating and stirring reaction in step S1 is carried out at a temperature of 120-130℃ for 20-24 hours.

3. The preparation method according to claim 1, characterized in that, The stirring reaction time in step S2 is 2-4 hours.

4. The preparation method according to claim 1, characterized in that, The stirring reaction time in step S3 is 2-4 hours.

5. The preparation method according to claim 1, characterized in that, In step S4, the amount added is 2-3 wt% of the total mass of the system, and the heating and stirring reaction is carried out at a temperature of 120-130℃ for 3-5 hours.

6. The preparation method according to claim 1, characterized in that, The initiator in step S5 is selected from at least one of sodium persulfate, potassium persulfate, and ammonium persulfate. The heating and stirring reaction is carried out at a temperature of 65-75°C for 4-6 hours.

7. The preparation method according to claim 1, characterized in that, Specifically, the following steps are included: S1. Dissolve 1 molar equivalent of zirconium chloride and 1 molar equivalent of 2-aminoterephthalic acid in N,N-dimethylformamide, add acetic acid, heat to 120-130℃, stir and react for 20-24h, cool to room temperature, filter, wash, and dry to obtain NH2-UiO-66. S2. Dissolve 10 parts by weight of maleic anhydride in N,N-dimethylformamide, add 18-22 parts by weight of NH2-UiO-66, stir the reaction for 2-4 hours, filter, wash, and dry to obtain MA-NH2-UiO-66. S3. Dissolve 1 molar equivalent of maleic anhydride in N,N-dimethylformamide, add 1.9-2.1 molar equivalents of diethanolamine, stir the reaction for 2-4 hours, remove the solvent under reduced pressure, and obtain monomer 1; S4. Dissolve 1 molar equivalent of maleic anhydride in a solvent, add 1.9-2.1 molar equivalents of diol and concentrated sulfuric acid, the amount of concentrated sulfuric acid added being 2-3 wt% of the total mass of the system, heat to 120-130℃, stir the reaction for 3-5 h, remove the solvent under reduced pressure to obtain monomer 2. S5. Add 5-7 parts by weight of acrylic acid, 3-5 parts by weight of MA-NH2-UiO-66, 2-3 parts by weight of monomer 1, 1-2 parts by weight of monomer 2, 2-3 parts by weight of silane coupling agent and 5-7 parts by weight of allyl polyoxyethylene ether to water, stir and mix evenly, add 0.01-0.05 parts by weight of initiator, heat to 65-75℃, stir and react for 4-6 hours, remove solvent under reduced pressure to obtain cement grinding aid.

8. A cement grinding aid prepared by the preparation method according to any one of claims 1-7.

9. The application of the cement grinding aid as described in claim 8 in the preparation of high-strength, high-wear-resistant cement.

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