CN113698126B

CN113698126B - Efficient cement grinding aid and preparation method and application thereof

Info

Publication number: CN113698126B
Application number: CN202111191128.7A
Authority: CN
Inventors: 胡浩; 胡鉴; 谢美交
Original assignee: Guangzhou Jiye Changqing New Material Co ltd
Current assignee: Guangzhou Jiye Changqing New Materials Co.,Ltd.
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-08-16
Anticipated expiration: 2041-10-13
Also published as: CN113698126A

Abstract

The invention provides a high-efficiency cement grinding aid, a preparation method and application thereof. The invention also provides a preparation method of the high-efficiency cement grinding aid. The high-efficiency cement grinding aid provided by the invention can reduce the friction coefficient of powder in the grinding process of cement materials, so that the flowability of cement powder is accelerated, the powder is fully ground, the grading of grinding particles is improved, the content of micro-powder particles is increased, the grinding efficiency is improved, and the power consumption of a grinding machine is reduced; can also improve the water retention effect of the cement in the using process and is beneficial to improving the adaptability of the cement.

Description

Efficient cement grinding aid and preparation method and application thereof

Technical Field

The invention belongs to the field of building materials, and particularly relates to a high-efficiency cement grinding aid, and a preparation method and application thereof.

Background

The cement grinding is a necessary process and a key link in cement production, the energy consumption and the power consumption respectively account for more than 30% of the total energy consumption and more than 70% of the total power consumption of the cement production, and in order to reduce the production cost of the cement and improve the quality and the production efficiency of the cement, the most direct and effective method is to add a small amount of cement grinding aids in the cement grinding process, so that the yield can be improved, the labor force can be reduced, the capacity can be increased, the power consumption of the unit capacity of the cement can be reduced, and the production cost can be reduced under the conditions of not increasing the grinding water and not changing the grinding time.

At present, more and more researches on the improvement of cement grinding aid formulas are carried out, and the aims of effectively improving the efficiency of cement grinding, reducing energy consumption and greatly improving the machine-hour yield and various technical indexes of cement are achieved. The composite grinding aid also contains an excitant which plays a role in exciting the potential activity of cement mixtures such as fly ash and mineral powder, so that the strength of cement can be improved, the production cost can be reduced, resources can be saved, and the carbon emission can be reduced. However, the existing cement grinding aid has the problems of poor grinding aid effect and poor adaptability in the application process due to unreasonable formula or raw material selection and the like.

CN110950570A discloses a high-efficiency cement grinding aid and a preparation method thereof, and the high-efficiency cement grinding aid is mainly prepared by mixing 35-40 parts of polyhydric alcohol, 2-4 parts of polyacrylamide, 2-3 parts of sodium humate, 1.5-2.5 parts of sodium hexametaphosphate, 15-20 parts of viscous loess, 2-5 parts of sodium lignosulfonate, 3-4 parts of sodium salicylate, 5-7 parts of N-methyldiethanolamine, 3-5 parts of sodium dodecyl sulfate, 1-2 parts of triethanolamine, 6-8 parts of monoglyceride fatty acid ester and 2-4 parts of sodium gluconate. Although the cement grinding aid improves the grinding efficiency and the strength of cement, the cement grinding aid does not solve the problems of poor water-retaining property of the cement in the using process and poor adaptability of the existing cement and additives.

CN108383419A discloses a high-efficiency cement grinding aid, which comprises 10-20 wt% of tap water, 20-30 wt% of polyhydric alcohol, 20-50 wt% of diethanol monoisopropanolamine, 5-25 wt% of triethanolamine, 2-5 wt% of betaine type amphoteric surfactant, 1-5 wt% of lignosulfonate and 1-3 wt% of organic silicon defoamer. Although the cement grinding aid can avoid the harm of chloride ions in the traditional cement grinding aid to cement, the cement grinding aid cannot solve the problems of poor water-retaining property of the cement in the using process and poor adaptability of the existing cement and additives.

CN108147692A discloses a cement grinding aid and a preparation method thereof. The cement grinding aid comprises an amide compound and a polyol compound. The preparation method comprises the steps of mixing and stirring diethanolamine and acrylate derivatives, and carrying out ester aminolysis reaction to obtain the cement grinding aid. The cement grinding aid also cannot solve the problems of poor water retention of cement in the using process and poor adaptability of the existing cement and additives.

Therefore, how to reasonably design the formula of the grinding aid enables the prepared cement grinding aid to have an excellent grinding aid effect, improve the fineness of cement, improve the fluidity of cement, and simultaneously improve the water retention effect of the cement in the using process, thereby being of great importance in improving the adaptability problem of the cement in the using process.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the high-efficiency cement grinding aid and the preparation method and the application thereof, which can reduce the friction coefficient of powder in the grinding process of cement materials, accelerate the fluidity of cement powder, further fully grind the powder, improve the gradation of grinding particles and increase the content of micro-powder particles, thereby improving the grinding efficiency and reducing the power consumption of a grinding machine; can also improve the water retention effect of the cement in the using process and is beneficial to improving the adaptability of the cement.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a high efficiency cement grinding aid comprising diethanol monoisopropanolamine, lignacalcium, and polyacrylamide.

The high-efficiency cement grinding aid provided by the invention can obviously reduce the surface energy of ground powder in the grinding process of cement materials, overcome the attraction among the ground powder, reduce the grinding resistance, prevent the cement from being pasted with balls and ground, accelerate the fluidity of cement powder, further fully grind the powder, improve the gradation of grinding particles and increase the content of micro-powder particles, thereby improving the grinding efficiency and reducing the power consumption of a grinding machine; can also improve the water retention effect of the cement in the using process and is beneficial to improving the adaptability of the cement.

The high-efficiency cement grinding aid provided by the invention is added with polyacrylamide, the polyacrylamide can be adsorbed on the surface of powder particles to form a liquid film, and the friction of the solid surface is changed into liquid friction, so that the friction coefficient of the powder is reduced, the fluidity of cement powder is accelerated, the powder is fully ground, the gradation of grinding particles can be improved, the content of micro powder particles is increased, and the fineness of cement can be improved. In addition, the polyacrylamide has the functions of thickening, flocculating and the like, and is favorable for improving the water retention property of cement, so that the adaptability of the cement is improved.

In addition, the high-efficiency cement grinding aid provided by the invention simultaneously contains diethanol monoisopropanolamine, calcium ligno-calcium and polyacrylamide, and the diethanol monoisopropanolamine, the calcium ligno-calcium and the polyacrylamide play a synergistic effect to further improve the grinding efficiency and improve the adaptability of cement. The diethanol monoisopropanolamine and the calcium lignocele have strong dispersing ability, the diethanol monoisopropanolamine has an excellent grinding-aiding effect, and the flow aid of the calcium lignocele can also reduce the friction of powder, so that the grinding efficiency can be further improved, and the flowability of the cement in the later-stage use process can be increased. Meanwhile, the polyacrylamide can reduce the friction force of powder and the surface energy of particles, so that the grinding efficiency is improved, the grinding energy consumption is reduced, the thickening, flocculation and other effects are realized, the phenomena of bleeding on the surface of cement and the like caused by the increase of the fluidity of the cement can be solved, and the adaptability of the cement is improved.

In a preferred embodiment of the present invention, the amount of diethanol monoisopropanolamine in the high efficiency cement grinding aid is 15 to 20 parts by weight, for example, 15 parts, 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts, 19.5 parts or 20 parts, but the amount is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.

The invention particularly limits 15-20 parts of diethanol monoisopropanolamine, and when the content of the diethanol monoisopropanolamine is higher than 20 parts, the later strength cannot be kept up to the standard, because the excessive diethanol monoisopropanolamine can cause the specific surface area of cement grinding to be too large, the early hydration reaction is fast, and the later strength is influenced; in addition, the redundant diethanolisopropanolamine can participate in the hydration reaction of the cement, so that the early strength of the cement is high, and the later strength cannot keep up with that of the cement; when the content of diethanol monoisopropanolamine is less than 15 parts, the early hydration speed of cement is too slow, and the strength of cement is increased too slowly, because the dosage of diethanol monoisopropanolamine is not enough, so that the grinding efficiency is low.

In a preferred embodiment of the invention, the weight part of the ligno-calcium in the high-efficiency cement grinding aid is 5 to 10 parts, for example, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts or 10 parts, but the invention is not limited to the recited values, and other values not recited in the range of the values are also applicable.

The invention particularly limits the content of the calcium lignocel to 5-10 parts, and when the content of the calcium lignocel is higher than 10 parts, the adaptability of the cement is poor, because on one hand, the excessive calcium lignocel can lead the cement to be ground to be finer, so that the early hydration of the cement is too fast, and various adaptability problems such as fast collapse and loss are generated, on the other hand, the excessive calcium lignocel can remain in the cement, and a plurality of bubbles are generated in the later cement using process; when the content of the wood calcium is less than 5 parts, the grinding effect is low, and the dispersing capacity of the grinding aid is reduced due to insufficient use of the wood calcium.

In a preferred embodiment of the invention, the polyacrylamide in the high efficiency cement grinding aid is 5 to 10 parts by weight, such as 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts or 10 parts, but the invention is not limited to the recited values, and other values in the range of the recited values are also applicable; preferably 6 to 8 parts.

The invention particularly limits the polyacrylamide to be 5-10 parts, and when the content of the polyacrylamide is higher than 10 parts, the adaptability of cement used in the later period is poor, and the cement demand is increased due to excessive polyacrylamide; when the content of polyacrylamide is less than 5 parts, the cement adaptability is also deteriorated, because the dosage of polyacrylamide is insufficient, not only the grinding efficiency is reduced, but also the water retention effect cannot be provided for the later cement using process.

As a preferable technical scheme, the high-efficiency cement grinding aid also comprises triethanolamine.

Preferably, the triethanolamine is present in an amount of 10 to 15 parts by weight, for example 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5 or 15 parts by weight, but not limited to the recited values, and other values not recited within this range are equally applicable.

As a preferable technical scheme, the high-efficiency cement grinding aid also comprises polyol.

Preferably, the polyols include glycerol and diethylene glycol.

Preferably, the glycerol is present in an amount of 10 to 15 parts by weight, for example 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5 or 15 parts by weight, but not limited to the recited amounts, and other unrecited amounts within the range are equally applicable.

Preferably, the diethylene glycol is present in an amount of 5 to 10 parts by weight, for example 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10 parts by weight, but not limited to the recited values, and other values not recited in this range are equally applicable.

As a preferable technical scheme, the high-efficiency cement grinding aid also comprises a defoaming agent.

Preferably, the amount of the defoaming agent is 0.1 to 0.5 parts by weight, and may be, for example, 0.1 part, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part, 0.45 part or 0.5 part, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are also applicable.

In a second aspect, the invention provides a method for preparing the high efficiency cement grinding aid of the first aspect, which comprises the following steps:

and mixing and dissolving diethanol monoisopropanolamine, calcium lignosulphonate and polyacrylamide and optional triethanolamine and/or polyalcohol in a solvent to obtain the high-efficiency cement grinding aid.

The preparation method of the high-efficiency cement grinding aid provided by the invention is simple in process, the raw materials are uniformly mixed at normal temperature and normal pressure to obtain the high-efficiency cement grinding aid, the cost is low, and the method is easy to popularize and apply.

As a preferred technical scheme of the present invention, the preparation method specifically comprises:

and adding the polyacrylamide and the calcium lignosulphonate into a solvent to be dissolved to obtain a primary mixed solution, then adding the diethanol monoisopropanolamine, the triethanolamine and the polyalcohol into the primary mixed solution to be dissolved to obtain a secondary mixed solution, and finally adding a defoaming agent into the secondary mixed solution to be dissolved to obtain the high-efficiency cement grinding aid.

Preferably, the solvent comprises water.

Preferably, the dissolving process is carried out under stirring.

In a third aspect, the present invention provides a cement comprising the high efficiency cement grinding aid of the first aspect.

Compared with the prior art, the invention has the following beneficial effects:

the high-efficiency cement grinding aid and the preparation method and application thereof provided by the invention can reduce the friction coefficient of powder in the grinding process of cement materials, accelerate the fluidity of cement powder, further fully grind the powder, improve the gradation of grinding particles and increase the content of micro-powder particles, thereby improving the grinding efficiency and reducing the power consumption of a grinder; can also improve the water retention effect of the cement in the using process and is beneficial to improving the adaptability of the cement.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

Example 1

The embodiment provides a high-efficiency cement grinding aid, which comprises the following components: 18 parts of diethanol monoisopropanolamine, 12 parts of triethanolamine, 12 parts of glycerol, 8 parts of diethylene glycol, 7 parts of ligneous calcium, 7 parts of polyacrylamide, 0.3 part of a defoaming agent and 35.7 parts of water;

the preparation method of the high-efficiency cement grinding aid specifically comprises the following steps:

adding 7 parts of polyacrylamide and 7 parts of wood calcium into 35.7 parts of water for dissolving to obtain a primary mixed solution, then adding 18 parts of diethanol monoisopropanolamine, 12 parts of triethanolamine, 12 parts of glycerol and 8 parts of diethylene glycol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.3 part of defoaming agent into the secondary mixed solution for dissolving to obtain the high-efficiency cement grinding aid.

Example 2

The embodiment provides a high-efficiency cement grinding aid, which comprises the following components: 15 parts of diethanol monoisopropanolamine, 15 parts of triethanolamine, 10 parts of glycerol, 10 parts of diethylene glycol, 5 parts of ligneous calcium, 10 parts of polyacrylamide, 0.1 part of a defoaming agent and 34.9 parts of water;

and adding 10 parts of polyacrylamide and 5 parts of wood calcium into 34.9 parts of water for dissolving to obtain a primary mixed solution, then adding 15 parts of diethanolisopropanolamine, 15 parts of triethanolamine, 10 parts of glycerol and 10 parts of diethylene glycol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.1 part of defoaming agent into the secondary mixed solution for dissolving to obtain the high-efficiency cement grinding aid.

Example 3

The embodiment provides a high-efficiency cement grinding aid, which comprises the following components: 20 parts of diethanol monoisopropanolamine, 10 parts of triethanolamine, 15 parts of glycerol, 5 parts of diethylene glycol, 10 parts of ligneous calcium, 5 parts of polyacrylamide, 0.5 part of a defoaming agent and 34.5 parts of water;

adding 5 parts of polyacrylamide and 10 parts of wood calcium into 34.8 parts of water for dissolving to obtain a primary mixed solution, then adding 20 parts of diethanol monoisopropanolamine, 10 parts of triethanolamine, 15 parts of glycerol and 5 parts of diethylene glycol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.5 part of defoaming agent into the secondary mixed solution for dissolving to obtain the high-efficiency cement grinding aid.

Example 4

The embodiment provides a high-efficiency cement grinding aid, which comprises the following components: 20 parts of diethanol monoisopropanolamine, 10 parts of triethanolamine, 10 parts of glycerol, 10 parts of diethylene glycol, 5 parts of ligneous calcium, 8 parts of polyacrylamide, 0.1 part of a defoaming agent and 36.9 parts of water;

adding 8 parts of polyacrylamide and 5 parts of wood calcium into 36.9 parts of water for dissolving to obtain a primary mixed solution, then adding 20 parts of diethanol monoisopropanolamine, 10 parts of triethanolamine, 10 parts of glycerol and 10 parts of diethylene glycol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.1 part of defoaming agent into the secondary mixed solution for dissolving to obtain the high-efficiency cement grinding aid.

Example 5

The embodiment provides a high-efficiency cement grinding aid, which comprises the following components: 15 parts of diethanol monoisopropanolamine, 15 parts of triethanolamine, 15 parts of glycerol, 10 parts of diethylene glycol, 5 parts of ligneous calcium, 6 parts of polyacrylamide, 0.1 part of a defoaming agent and 33.9 parts of water;

adding 6 parts of polyacrylamide and 5 parts of wood calcium into 33.9 parts of water for dissolving to obtain a primary mixed solution, adding 15 parts of diethanol monoisopropanolamine, 15 parts of triethanolamine, 15 parts of glycerol and 10 parts of diethylene glycol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.1 part of defoaming agent into the secondary mixed solution for dissolving to obtain the high-efficiency cement grinding aid.

Example 6

The embodiment provides a high-efficiency cement grinding aid, which comprises the following components: 15 parts of diethanol monoisopropanolamine, 10 parts of triethanolamine, 15 parts of glycerol, 10 parts of diethylene glycol, 5 parts of ligneous calcium, 7 parts of polyacrylamide, 0.1 part of a defoaming agent and 37.9 parts of water;

adding 7 parts of polyacrylamide and 5 parts of wood calcium into 37.9 parts of water for dissolving to obtain a primary mixed solution, then adding 15 parts of diethanol monoisopropanolamine, 10 parts of triethanolamine, 15 parts of glycerol and 10 parts of diethylene glycol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.1 part of defoaming agent into the secondary mixed solution for dissolving to obtain the high-efficiency cement grinding aid.

Example 7

The difference between the embodiment and the embodiment 1 is that the composition of the high-efficiency cement grinding aid comprises 12 parts of polyacrylamide, and the rest process parameters and operation steps are the same as those of the embodiment 1.

Example 8

The difference between the embodiment and the embodiment 1 is that the composition of the high-efficiency cement grinding aid comprises 3 parts of polyacrylamide, and the rest process parameters and operation steps are the same as those of the embodiment 1.

Example 9

The difference between the embodiment and the embodiment 1 is that the composition of the high-efficiency cement grinding aid contains 12 parts of calcium lignosulfonate, and the rest process parameters and the operation steps are the same as those of the embodiment 1.

Example 10

The difference between the embodiment and the embodiment 1 is that the composition of the high-efficiency cement grinding aid comprises 3 parts of calcium lignosulphonate, and the rest process parameters and operation steps are the same as those of the embodiment 1.

Example 11

The difference between the embodiment and the embodiment 1 is that the composition of the high-efficiency cement grinding aid is 22 parts of diethanol monoisopropanolamine, and the rest technological parameters and the operation steps are the same as those of the embodiment 1.

Example 12

The difference between the embodiment and the embodiment 1 is that the composition of the high-efficiency cement grinding aid is 13 parts of diethanol monoisopropanolamine, and the rest technological parameters and the operation steps are the same as those of the embodiment 1.

Comparative example 1

The difference between the comparative example and the example 1 is that polyacrylamide is omitted from the composition of the high-efficiency cement grinding aid, the parts of the polyacrylamide are distributed to other components according to the formula proportion of the high-efficiency cement grinding aid, and other process parameters and operation steps are the same as those of the example 1.

Comparative example 2

The difference between the comparative example and the example 1 is that the components of the high-efficiency cement grinding aid are free from the calcium lignosulfonate, the parts of the calcium lignosulfonate are distributed to other components according to the formula proportion of the high-efficiency cement grinding aid, and other process parameters and operation steps are the same as those of the example 1.

Comparative example 3

The difference between the comparative example and the example 1 is that the diethanol monoisopropanolamine is omitted from the composition of the high-efficiency cement grinding aid, the parts of the diethanol monoisopropanolamine are distributed to other components according to the formula proportion of the high-efficiency cement grinding aid, and other process parameters and operation steps are the same as those in the example 1.

Comparative example 4

The difference between the comparative example and the example 1 is that the components of the high-efficiency cement grinding aid are free from ligneous calcium and polyacrylamide, the total parts of ligneous calcium and polyacrylamide are distributed to other components according to the formula proportion of the high-efficiency cement grinding aid, and other process parameters and operation steps are the same as those of the example 1.

Comparative example 5

The difference between the comparative example and the example 1 is that the composition of the high-efficiency cement grinding aid omits polyacrylamide and diethanolisopropanolamine, the total parts of the polyacrylamide and the diethanolisopropanolamine are distributed to other components according to the formula proportion of the high-efficiency cement grinding aid, and other process parameters and operation steps are the same as those in the example 1.

Comparative example 6

The difference between the comparative example and the example 1 is that the high-efficiency cement grinding aid is formed by omitting the ligneous calcium and the diethanol monoisopropanolamine, and distributing the total parts of the ligneous calcium and the diethanol monoisopropanolamine to other components according to the formula proportion of the high-efficiency cement grinding aid, and the other process parameters and the operation steps are the same as those in the example 1.

The performance test results of the high efficiency cement grinding aids prepared in examples 1-12 and comparative examples 1-6 after being blended into cement (cement type PO 42.5; the doping amount of the high efficiency cement grinding aid is 0.1 wt%) are shown in Table 1.

TABLE 1

As can be seen from the data in table 1:

(1) the high-efficiency cement grinding aids of examples 1-6 have excellent grinding aid effect, and the flowability of cement is remarkably improved; meanwhile, the high-efficiency cement grinding aid provided by the invention also effectively improves the water retention effect of cement in the using process, reduces the bleeding rate and is beneficial to improving the adaptability of cement.

(2) The cement grinding aid in example 7 has a grinding aid effect and improves the cement flowability to a lesser extent than in example 1, but the improvement of the water retention and adaptability of the cement during use is lower than that of example 1, because the addition of the polyacrylamide in example 7 is too high, and when the addition of the polyacrylamide is too high, the cement requirement is increased, and the adaptability of the cement at the later stage of use is poor. The cement grinding aid in example 8 has a lower grinding aid effect, and improves the fluidity and water retention of cement than in example 1, because when the amount of polyacrylamide added is too low, the grinding efficiency is reduced and the water retention effect cannot be provided for later cement use due to insufficient amount of polyacrylamide. Therefore, the adding amount of the polyacrylamide has obvious influence on the overall performance of the high-efficiency cement grinding aid.

(3) The cement grinding aid in the example 9 has the grinding aid effect and the improvement degree on the cement flowability which are not much different from those in the example 1, but the improvement degree on the water-retaining property and the adaptability of the cement in the using process is lower than that in the example 1, because the adding amount of the wood calcium in the example 9 is too high, on one hand, the wood calcium is excessively added, so that the cement is ground to be finer, the early hydration of the cement is too fast, and various adaptability problems are caused, such as rapid collapse loss, on the other hand, the wood calcium is excessively remained in the cement, so that a plurality of air bubbles are caused when the cement is used in the later period. The cement grinding aid in example 10 has a lower grinding aid effect and improved cement flowability than in example 1, because the dispersing ability of the grinding aid is reduced due to the insufficient amount of the lignalcium when the amount of lignalcium added in example 10 is too low, thereby reducing the grinding aid effect. Therefore, the addition amount of the ligno-calcium has obvious influence on the overall performance of the high-efficiency cement grinding aid.

(4) The cement grinding aids of examples 11 and 12 both had less grinding aid effect and improved cement flow than example 1 because the amount of diethanol monoisopropanolamine added was too high for example 11 and too low for example 12. When the addition amount of the diethanol monoisopropanolamine is too high, the specific surface area of cement grinding is too large, the early hydration reaction is fast, the later strength of the cement is influenced, and the excessive diethanol monoisopropanolamine also participates in the hydration reaction of the cement, so that the early strength of the cement is high, and the later strength of the cement is poor; when the addition amount of diethanol monoisopropanolamine is too low, the grinding efficiency is low, and the early hydration of cement is too slow. Therefore, the addition amount of the diethanol monoisopropanolamine has obvious influence on the overall performance of the high-efficiency cement grinding aid.

(5) The cement grinding aids of comparative examples 1-6 failed to achieve the overall performance effect of the cement grinding aid of example 1, as polyacrylamide was omitted from comparative example 1; comparative example 2 wood calcium was omitted; comparative example 3 omits diethanolisopropanolamine; comparative example 4 omits lignocel and polyacrylamide; comparative example 5 omits polyacrylamide and diethanolisopropanolamine; comparative example 6 omits lignocelium and diethanolisopropanolamine. The data of the comparative examples 1 to 3 show that the polyacrylamide, the ligneous calcium and the diethanolisopropanolamine have a synergistic effect in the high-efficiency cement grinding aid provided by the invention, and the synergistic effect of the polyacrylamide, the ligneous calcium and the diethanolisopropanolamine can improve the grinding effect, the fineness of the cement, the fluidity of the cement, the water retention effect of the cement in the using process and the adaptability of the cement.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high efficiency cement grinding aid, characterized in that the high efficiency cement grinding aid comprises diethanol monoisopropanolamine, calcium lignosulfonate and polyacrylamide;

the weight part of the calcium lignosulphonate in the high-efficiency cement grinding aid is 5-10 parts;

5-10 parts of polyacrylamide in the high-efficiency cement grinding aid;

15-20 parts of diethanol monoisopropanolamine in the high-efficiency cement grinding aid;

the high-efficiency cement grinding aid also comprises triethanolamine and polyalcohol.

2. The efficient cement grinding aid as claimed in claim 1, wherein the weight part of polyacrylamide in the efficient cement grinding aid is 6-8 parts.

3. The efficient cement grinding aid as claimed in claim 1, wherein the triethanolamine is present in an amount of 10 to 15 parts by weight.

4. The high efficiency cement grinding aid of claim 1 wherein the polyol comprises glycerol and diethylene glycol.

5. The efficient cement grinding aid as claimed in claim 4, wherein the glycerol is 10-15 parts by weight.

6. The efficient cement grinding aid as claimed in claim 4, wherein the weight part of the diethylene glycol is 5-10 parts.

7. The high efficiency cement grinding aid of claim 1 further comprising a defoamer.

8. The efficient cement grinding aid as claimed in claim 7, wherein the defoaming agent is 0.1-0.5 part by weight.

9. A method for preparing the high efficiency cement grinding aid of any one of claims 1 to 8, wherein the method comprises the following steps:

mixing and dissolving diethanol monoisopropanolamine, calcium lignosulphonate, polyacrylamide, triethanolamine and polyalcohol in a solvent to obtain the high-efficiency cement grinding aid.

10. The method according to claim 9, comprising:

and adding the polyacrylamide and the calcium lignosulphonate into a solvent to be dissolved to obtain a primary mixed solution, then adding the diethanol monoisopropanolamine, the triethanolamine and the polyalcohol into the primary mixed solution to be dissolved to obtain a secondary mixed solution, and finally adding an optional defoaming agent into the secondary mixed solution to be dissolved to obtain the high-efficiency cement grinding aid.

11. The method of claim 10, wherein the solvent comprises water.

12. The method according to claim 10, wherein the dissolving is performed under stirring.

13. A cement comprising the high efficiency cement grinding aid of any one of claims 1-12.