A cement grinding aid with water-reducing function and its processing technology

Abstract

The invention relates to the technical field of cement additives, specifically to a cement grinding aid with a water-reducing function and a processing technology thereof; in order to enhance the cement grinding efficiency, the invention prepares a cement grinding aid with a branched structure, introduces a polyether segment with a water-reducing function by limiting the reaction conditions and selecting the reaction raw materials, and retains the phosphoric acid group and the carboxylic acid group structure, thereby ensuring that the grinding aid prepared by the invention has a large number of active sites on its surface, can be combined with cement particles, coated on its surface, reduce the friction between cement particles, adjust the electrical properties of the cement particle surface, reduce the agglomeration phenomenon between cement particles, and promote the improvement of grinding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of cement additives, in particular to a cement grinding aid with a water-reducing function and a processing technology thereof. Background Art

[0002] Cement is one of the most widely used raw materials in the current construction industry. Its production process is often accompanied by huge energy consumption, especially in the final production stage of cement. In order to enhance its hydration activity, it is often necessary to grind it and reduce the particle size of cement particles to accelerate the hydration rate. However, during the grinding process, cement often agglomerates, resulting in reduced grinding efficiency, increased energy consumption, and low production efficiency. However, if the particle size of cement clinker is too fine, it will also increase the water demand of cement, reduce fluidity, poor adaptability, and poor collapse retention performance. Therefore, it is necessary to improve cement grinding aids to further meet the needs of cement concrete projects. Summary of the invention

[0003] The object of the present invention is to provide a cement grinding aid with water reducing function and a processing technology thereof, so as to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solution: a processing technology of a cement grinding aid with water reducing function, comprising the following steps:

[0005] S1. Treat glycerol tri(1,2-epoxy)propyl ether in an ice-water bath, cool to a constant temperature, and then dropwise add a mixed solution of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide for 1-1.5 hours. After the dropwise addition is completed, the temperature is raised to 45-60° C., react for 1.5-3 hours, and then evaporated in vacuo to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0006] S2. Under nitrogen atmosphere protection, the epoxy-terminated polyether polymer is dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which is added dropwise to the melamine dilution solution for 0.5-1h. After the addition is completed, the temperature is raised to 55-75°C, and after reacting for 2-4h, the excess solvent is removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0007] S3. Under nitrogen atmosphere protection, disperse the terminal amino-modified polyether polymer into N,N-dimethylacetamide, add it dropwise into isophorone diisocyanate, raise the temperature to 35-45°C, react for 1-1.5 hours, treat in an ice-water bath to a constant temperature, add inositol phosphate, react for 1-1.5 hours, add 3-aminopyridine-2-carboxylic acid, raise the temperature to 15-25°C, react for 0.5-1.5 hours, add dibutyltin dilaurate, raise the temperature to 72-80°C, react for 4-8 hours, stop heating, remove excess solvent by rotary evaporation, evaporate in vacuo to constant weight, and obtain a cement grinding aid.

[0008] Furthermore, in step S1, the molar ratio of glycerol tri(1,2-epoxy)propyl ether to 4,4'-diaminodiphenyl ether is (1.8-2.5):1 in terms of molar parts.

[0009] Furthermore, in step S2, the mass ratio of the epoxy-terminated polyether polymer to melamine is 1:(0.6-0.75) in terms of mass fractions.

[0010] Furthermore, in step S2, the mass ratio of melamine to organic solvent in the melamine dilution solution is 1:(3-5);

[0011] The organic solvent is any one of N,N-dimethylformamide and N,N-dimethylacetamide.

[0012] Furthermore, the temperature of the melamine dilution solution is 0-6°C.

[0013] Furthermore, in step S3, the mass ratio of the terminal amino-modified polyether polymer, isophorone diisocyanate, inositol phosphate, 3-aminopyridine-2-carboxylic acid, and dibutyltin dilaurate is 1: (1.2-1.48): (0.21-0.45): (0.2-0.4): (0.01-0.02) in parts by weight.

[0014] Furthermore, the cement grinding aid is added in an amount of 3-5‰ of the cement mass during cement grinding. Compared with the prior art, the beneficial effects achieved by the present invention are:

[0015] 1. In order to enhance the cement grinding efficiency, the present invention prepares a cement grinding aid with a branched structure. The cement grinding aid prepared by the present invention is a spherical structure with a large number of active sites on the surface, which can be combined with cement particles and coated on the surface to form an adsorption layer, thereby reducing the friction between cement particles. In addition, the end groups of the cement grinding aid prepared by the present invention contain a large number of carboxyl groups and phosphate groups, which can form a complex with metal particles, thereby further adjusting the electrical properties of the cement particle surface, reducing the agglomeration phenomenon between cement particles, and promoting the improvement of grinding efficiency;

[0016] 2. The present invention first uses 4,4'-diaminodiphenyl ether and glycerol tri(1,2-epoxy)propyl ether for a mixed reaction, and introduces a polyether segment with a water-reducing function by limiting the reaction conditions and selecting the reaction raw materials, thereby generating a dumbbell-shaped four-arm compound with an epoxy end group. After that, the present invention further uses melamine to react with it, thereby increasing the branching degree of the product and forming a spherical structure, and uses isocyanate to treat its end group, thereby increasing the reaction activity; finally, amino-containing inositol phosphate and 3-aminopyridine-2-carboxylic acid are used to react with it respectively, and the amino group with higher reaction activity is used to preferentially react with the isocyanate group for grafting, thereby retaining the phosphoric acid group and the carboxylic acid group structure, and improving the grinding aid performance and water-reducing performance of the grinding aid. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the embodiments and comparative examples of the present invention, the CAS number of glycerol tri(1,2-epoxy)propyl ether used is: 13236-02-7, provided by Shanghai Yuanye Biotechnology Co., Ltd.; the CAS number of 4,4'-diaminodiphenyl ether used is 101-80-4, provided by Shanghai Haohong Biomedical Technology Co., Ltd.; the CAS number of inositol phosphate used is 6903-79-3, provided by Shanghai Aladdin Biochemical Technology Co., Ltd.; the CAS number of 3-aminopyridine-2-carboxylic acid used is: 1462-86-8, provided by Shanghai Haohong Biomedical Technology Co., Ltd.; the commercially available grinding aid used is GA-200

[0019] Example 1.

[0020] A processing technology for a cement grinding aid with a water-reducing function comprises the following steps:

[0021] S1. In molar parts, under nitrogen atmosphere, 1.8 mol parts of glycerol tri(1,2-epoxy)propyl ether were treated in an ice-water bath, cooled to a constant temperature, and then a mixed solution of 1 mol part of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide was added dropwise. The addition time was 1 hour. After the addition was completed, the temperature was raised to 45°C, and the reaction was continued for 1.5 hours. The mixture was evaporated to constant weight at 80°C in vacuum to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0022] S2. Under nitrogen atmosphere protection, 1 part by weight of the epoxy-terminated polyether polymer was dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which was added dropwise to the melamine dilution solution for 0.5 h. After the addition was completed, the temperature was raised to 55 ° C. After reacting for 2 h, the excess solvent was removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0023] The melamine dilution contains 0.6 parts by weight of melamine and 1.8 parts of N,N-dimethylformamide, and the temperature of the melamine dilution is 4-6°C;

[0024] S3. Under nitrogen atmosphere protection, 1 part by weight of terminal amino-modified polyether polymer is dispersed in N,N-dimethylacetamide, added dropwise to 1.2 parts by weight of isophorone diisocyanate, heated to 35°C, reacted for 1 hour, treated in an ice-water bath to a constant temperature, added 0.21 parts by weight of inositol phosphate, stirred and reacted for 1 hour, added 0.2 parts by weight of 3-aminopyridine-2-carboxylic acid, heated to 15°C, reacted for 0.5 hour, added 0.01 parts by weight of dibutyltin dilaurate, heated to 72°C, reacted for 4 hours, stopped heating, rotary evaporated to remove excess solvent, evaporated in vacuo to constant weight, and obtained a cement grinding aid.

[0025] Example 2.

[0026] Compared with Example 1, this example increases the amount of glycerol tri(1,2-epoxy)propyl ether added in step S1;

[0027] A processing technology for a cement grinding aid with a water-reducing function comprises the following steps:

[0028] S1. In molar parts, under nitrogen atmosphere, 2.5 mol parts of glycerol tri(1,2-epoxy)propyl ether were treated in an ice-water bath, cooled to a constant temperature, and then a mixed solution of 1 mol part of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide was added dropwise. The addition time was 1 hour. After the addition was completed, the temperature was raised to 45°C, and the reaction was continued for 1.5 hours. The mixture was evaporated to constant weight at 80°C in vacuum to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0029] S2. Under nitrogen atmosphere protection, 1 part by weight of the epoxy-terminated polyether polymer was dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which was added dropwise to the melamine dilution solution for 0.5 h. After the addition was completed, the temperature was raised to 55 ° C. After reacting for 2 h, the excess solvent was removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0030] The melamine dilution contains 0.6 parts by weight of melamine and 1.8 parts of N,N-dimethylformamide, and the temperature of the melamine dilution is 4-6°C;

[0031] S3. Under nitrogen atmosphere protection, 1 part by weight of terminal amino-modified polyether polymer is dispersed in N,N-dimethylacetamide, added dropwise to 1.2 parts by weight of isophorone diisocyanate, heated to 35°C, reacted for 1 hour, treated in an ice-water bath to a constant temperature, added 0.21 parts by weight of inositol phosphate, stirred and reacted for 1 hour, added 0.2 parts by weight of 3-aminopyridine-2-carboxylic acid, heated to 15°C, reacted for 0.5 hour, added 0.01 parts by weight of dibutyltin dilaurate, heated to 72°C, reacted for 4 hours, stopped heating, rotary evaporated to remove excess solvent, evaporated in vacuo to constant weight, and obtained a cement grinding aid.

[0032] Example 3.

[0033] Compared with Example 1, the amount of melamine added in step S2 is increased in this embodiment;

[0034] A processing technology for a cement grinding aid with a water-reducing function comprises the following steps:

[0035] S1. In molar parts, under nitrogen atmosphere, 1.8 mol parts of glycerol tri(1,2-epoxy)propyl ether were treated in an ice-water bath, cooled to a constant temperature, and then a mixed solution of 1 mol part of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide was added dropwise. The addition time was 1 hour. After the addition was completed, the temperature was raised to 45°C, and the reaction was continued for 1.5 hours. The mixture was evaporated to constant weight at 80°C in vacuum to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0036] S2. Under nitrogen atmosphere protection, 1 part by weight of the epoxy-terminated polyether polymer was dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which was added dropwise to the melamine dilution solution for 0.5 h. After the addition was completed, the temperature was raised to 55 ° C. After reacting for 2 h, the excess solvent was removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0037] The melamine dilution contains 0.75 parts by weight of melamine and 2.4 parts of N,N-dimethylformamide, and the temperature of the melamine dilution is 4-6°C;

[0038] S3. Under nitrogen atmosphere protection, 1 part by weight of terminal amino-modified polyether polymer is dispersed in N,N-dimethylacetamide, added dropwise to 1.2 parts by weight of isophorone diisocyanate, heated to 35°C, reacted for 1 hour, treated in an ice-water bath to a constant temperature, added 0.21 parts by weight of inositol phosphate, stirred and reacted for 1 hour, added 0.2 parts by weight of 3-aminopyridine-2-carboxylic acid, heated to 15°C, reacted for 0.5 hour, added 0.01 parts by weight of dibutyltin dilaurate, heated to 72°C, reacted for 4 hours, stopped heating, rotary evaporated to remove excess solvent, evaporated in vacuo to constant weight, and obtained a cement grinding aid.

[0039] Example 4.

[0040] Compared with Example 1, this example increases the amount of inositol phosphate added in step S3;

[0041] A processing technology for a cement grinding aid with a water-reducing function comprises the following steps:

[0042] S1. In molar parts, under nitrogen atmosphere, 1.8 mol parts of glycerol tri(1,2-epoxy)propyl ether were treated in an ice-water bath, cooled to a constant temperature, and then a mixed solution of 1 mol part of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide was added dropwise. The addition time was 1 hour. After the addition was completed, the temperature was raised to 45°C, and the reaction was continued for 1.5 hours. The mixture was evaporated to constant weight at 80°C in vacuum to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0043] S2. Under nitrogen atmosphere protection, 1 part by weight of the epoxy-terminated polyether polymer was dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which was added dropwise to the melamine dilution solution for 0.5 h. After the addition was completed, the temperature was raised to 55 ° C. After reacting for 2 h, the excess solvent was removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0044] The melamine dilution contains 0.6 parts by weight of melamine and 1.8 parts of N,N-dimethylformamide, and the temperature of the melamine dilution is 4-6°C;

[0045] S3. Under nitrogen atmosphere protection, 1 part by weight of terminal amino-modified polyether polymer is dispersed in N,N-dimethylacetamide, added dropwise to 1.2 parts by weight of isophorone diisocyanate, heated to 35°C, reacted for 1 hour, treated in an ice-water bath to a constant temperature, added 0.45 parts by weight of inositol phosphate, stirred and reacted for 1 hour, added 0.2 parts by weight of 3-aminopyridine-2-carboxylic acid, heated to 15°C, reacted for 0.5 hour, added 0.01 parts by weight of dibutyltin dilaurate, heated to 72°C, reacted for 4 hours, stopped heating, rotary evaporated to remove excess solvent, evaporated in vacuo to constant weight, and obtained a cement grinding aid.

[0046] Example 5.

[0047] Compared with Example 1, this example increases the amount of 3-aminopyridine-2-carboxylic acid added in step S3;

[0048] A processing technology for a cement grinding aid with a water-reducing function comprises the following steps:

[0049] S1. In molar parts, under nitrogen atmosphere, 1.8 mol parts of glycerol tri(1,2-epoxy)propyl ether were treated in an ice-water bath, cooled to a constant temperature, and then a mixed solution of 1 mol part of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide was added dropwise. The addition time was 1 hour. After the addition was completed, the temperature was raised to 45°C, and the reaction was continued for 1.5 hours. The mixture was evaporated to constant weight at 80°C in vacuum to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0050] S2. Under nitrogen atmosphere protection, 1 part by weight of the epoxy-terminated polyether polymer was dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which was added dropwise to the melamine dilution solution for 0.5 h. After the addition was completed, the temperature was raised to 55 ° C. After reacting for 2 h, the excess solvent was removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0051] The melamine dilution contains 0.6 parts by weight of melamine and 1.8 parts of N,N-dimethylformamide, and the temperature of the melamine dilution is 4-6°C;

[0052] S3. Under nitrogen atmosphere protection, 1 part by weight of terminal amino-modified polyether polymer is dispersed in N,N-dimethylacetamide, added dropwise to 1.2 parts by weight of isophorone diisocyanate, heated to 35°C, reacted for 1 hour, treated in an ice-water bath to a constant temperature, added 0.21 parts by weight of inositol phosphate, stirred and reacted for 1 hour, added 0.4 parts by weight of 3-aminopyridine-2-carboxylic acid, heated to 15°C, reacted for 0.5 hour, added 0.01 parts by weight of dibutyltin dilaurate, heated to 72°C, reacted for 4 hours, stopped heating, rotary evaporated to remove excess solvent, evaporated in vacuo to constant weight, and obtained a cement grinding aid.

[0053] Example 6.

[0054] Compared with Example 1, this example increases the amount of isocyanate added in step S3;

[0055] A processing technology for a cement grinding aid with a water-reducing function comprises the following steps:

[0056] S1. In molar parts, under nitrogen atmosphere, 1.8 mol parts of glycerol tri(1,2-epoxy)propyl ether were treated in an ice-water bath, cooled to a constant temperature, and then a mixed solution of 1 mol part of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide was added dropwise. The addition time was 1 hour. After the addition was completed, the temperature was raised to 45°C, and the reaction was continued for 1.5 hours. The mixture was evaporated to constant weight at 80°C in vacuum to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0057] S2. Under nitrogen atmosphere protection, 1 part by weight of the epoxy-terminated polyether polymer was dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which was added dropwise to the melamine dilution solution for 0.5 h. After the addition was completed, the temperature was raised to 55 ° C. After reacting for 2 h, the excess solvent was removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0058] The melamine dilution contains 0.6 parts by weight of melamine and 1.8 parts of N,N-dimethylformamide, and the temperature of the melamine dilution is 4-6°C;

[0059] S3. Under nitrogen atmosphere protection, 1 part by weight of terminal amino-modified polyether polymer was dispersed in N,N-dimethylacetamide, and the mixture was added dropwise to 1.48 parts by weight of isophorone diisocyanate. The mixture was heated to 35°C and reacted for 1 hour. The mixture was then treated in an ice-water bath until the temperature was constant. 0.21 parts by weight of inositol phosphate was added and stirred for reaction for 1 hour. Then, 0.2 parts by weight of 3-aminopyridine-2-carboxylic acid was added. The mixture was heated to 15°C and reacted for 0.5 hour. Then, 0.01 parts by weight of dibutyltin dilaurate was added. The mixture was heated to 72°C and reacted for 4 hours. Then, the heating was stopped, excess solvent was removed by rotary evaporation, and the mixture was evaporated in vacuo to constant weight to obtain a cement grinding aid.

[0060] Example 7.

[0061] A processing technology for a cement grinding aid with a water-reducing function comprises the following steps:

[0062] S1. In molar parts, under nitrogen atmosphere, 2.5 mol parts of glycerol tri(1,2-epoxy)propyl ether were treated in an ice-water bath, cooled to a constant temperature, and then a mixed solution of 1 mol part of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide was added dropwise for 1.5 h. After the addition was completed, the temperature was raised to 60 ° C. After reacting for 3 h, the mixture was evaporated to constant weight at 80 ° C in vacuum to remove excess solvent to obtain a polyether polymer treated with epoxy end groups;

[0063] S2. Under nitrogen atmosphere protection, 1 part by weight of the epoxy-terminated polyether polymer was dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which was added dropwise to the melamine dilution solution for 1 hour. After the addition was completed, the temperature was raised to 75° C., and after the reaction for 4 hours, the excess solvent was removed by rotary evaporation to obtain an amino-terminated polyether polymer;

[0064] The melamine dilution contains 0.75 parts by weight of melamine and 2.4 parts of N,N-dimethylformamide, and the temperature of the melamine dilution is 4-6°C;

[0065] S3. Under nitrogen atmosphere protection, 1 part by weight of an amino-modified polyether polymer was dispersed in N,N-dimethylacetamide, and the mixture was added dropwise to 1.48 parts by weight of isophorone diisocyanate. The mixture was heated to 45°C and reacted for 1.5 hours. The mixture was then treated in an ice-water bath until the temperature was constant. 0.45 parts by weight of inositol phosphate was added and stirred for reaction for 1.5 hours. Then, 0.4 parts by weight of 3-aminopyridine-2-carboxylic acid was added. The mixture was heated to 25°C and reacted for 1.5 hours. Then, 0.02 parts by weight of dibutyltin dilaurate was added. The mixture was heated to 80°C and reacted for 8 hours. The heating was then stopped, excess solvent was removed by rotary evaporation, and the mixture was evaporated in vacuo to constant weight to obtain a cement grinding aid.

[0066] Comparative Example 1.

[0067] Compared with Example 1, this comparative example provides a commercially available grinding aid, model GA-200;

[0068] The cement grinding aids prepared in Examples 1-7 and Comparative Example 1 were mixed with PC42.5 cement at a ratio of 4‰ of the total weight. A cement blank group without any grinding aid was set up. They were placed in a 500*500mm cement ball mill, milled for 30 minutes, cooled and discharged, and the specific surface area of ​​the ground cement was measured using a DBT-127 Boehm-type air permeability specific surface area meter; the cement after ball milling was taken, and its fluidity was tested according to the method of GB / T 8077. The results are shown in the following table:

[0069] <![CDATA[Specific surface area (m 2 / kg)]]> Fluidity(mm) Blank group 344.7 194 Example 1 354.1 221 Example 2 359.2 228 Example 3 355.4 224 Example 4 356.2 225 Example 5 355.9 226 Example 6 356.8 226 Example 7 361.2 231 Comparative Example 1 354.2 192

[0070] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A processing technology for a cement grinding aid with water-reducing function, characterized in that: The following steps are involved: S1. Treat glycerol tri(1,2-epoxy)propyl ether in an ice-water bath, cool to a constant temperature, and then dropwise add a mixed solution of 4,4'-diaminodiphenyl ether in N,N-dimethylformamide for 1-1.5 hours. After the dropwise addition is completed, the temperature is raised to 45-60°C, and the reaction is continued for 1.5-3 hours. The excess solvent is removed by vacuum evaporation to obtain a polyether polymer treated with epoxy end groups; Wherein, the molar ratio of glycerol tri(1,2-epoxy)propyl ether and 4,4'-diaminodiphenyl ether is (1.8-2.5):1; S2. Under nitrogen atmosphere protection, the epoxy-terminated polyether polymer is dispersed again in pure N,N-dimethylformamide to prepare a polyether dispersion, which is then added dropwise to the melamine dilution solution for 0.5-1h. After the addition is completed, the temperature is raised to 55-75°C, and after reacting for 2-4h, the excess solvent is removed by rotary evaporation to obtain an amino-terminated polyether polymer; Wherein, the mass ratio of the epoxy-terminated polyether polymer to melamine is 1:(0.6-0.75); S3. Under nitrogen atmosphere protection, disperse the amino-terminated polyether polymer into N,N-dimethylacetamide, add it dropwise into isophorone diisocyanate, heat to 35-45°C, react for 1-1.5h, treat in an ice-water bath until constant temperature, add inositol phosphate, react for 1-1.5h, add 3-aminopyridine-2-carboxylic acid, heat to 15-25°C, react for 0.5-1.5h, add dibutyltin dilaurate, heat to 72-80°C, react for 4-8h, stop heating, remove excess solvent by rotary evaporation, evaporate in vacuum until constant weight, and obtain cement grinding aid; The mass ratio of the amino-modified polyether polymer, isophorone diisocyanate, inositol phosphate, 3-aminopyridine-2-carboxylic acid and dibutyltin dilaurate is 1: (1.2-1.48): (0.21-0.45): (0.2-0.4): (0.01-0.02).

2. The processing technology of a cement grinding aid with water reducing function according to claim 1, characterized in that: In step S2, in the melamine dilution solution, the mass ratio of melamine to organic solvent is 1:(3-5); The organic solvent is any one of N,N-dimethylformamide and N,N-dimethylacetamide.

3. The processing technology of a cement grinding aid with water reducing function according to claim 1, characterized in that: The temperature of the melamine dilution solution is 0-6°C.

4. A cement grinding aid prepared by the processing technology described in any one of claims 1 to 3.

5. Use of a cement grinding aid as claimed in claim 4 in cement grinding, characterized in that: The cement grinding aid is added in an amount of 3-5‰ of the cement mass during cement grinding.