Carbon reduction type cement grinding aid as well as preparation method and application thereof

Abstract

The invention provides a carbon-reducing cement grinding aid as well as a preparation method and application thereof, and relates to the technical field of cement admixtures. Specifically, the early strength agent comprises 15-40 parts of modified alcohol amine, 5-20 parts of a hydration control component, 3-15 parts of a masking component and 3-15 parts of an early strength component, wherein the modified alcohol amine is obtained by carrying out addition on dihydric alcohol amine and an acrylate compound. The cement grinding aid can effectively solve the problems that a traditional grinding aid is difficult to adapt to cement products of high-content medium-low-activity mixed materials, and the cement construction performance is reduced due to the fact that the hydration speed is high when the traditional grinding aid is added; by designing the combination of the four core raw materials, the clinker hydration rate is increased, the activation of medium and low activity mixed materials is enhanced, and the hydration product structure is improved synergistically, so that the clinker mixing amount of the cement is reduced, the strength and working performance of the masonry cement are improved, the construction performance of the cement is effectively improved, and the construction cost is reduced. Good application prospects are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of cement admixtures, and in particular to a carbon reduction type cement grinding aid, a preparation method thereof and an application thereof. Background Art

[0002] In cement production, the calcination of clinker is the main source of carbon emissions. If the clinker coefficient of cement can be reduced and the amount of admixture can be increased, not only can the cost of cement production be reduced, but also carbon emissions can be effectively reduced. Among them, admixtures generally refer to mixed materials with volcanic ash properties or potential hydraulic properties. When mixed with lime and gypsum and water is added, they can generate hydration products with gelling properties at room temperature, which can harden in water and in the air. In this field, they are usually divided into high-activity admixtures and medium- and low-activity admixtures based on their reaction activity. Among them, high-activity admixtures can quickly and in large quantities generate hydration products after being mixed with activators such as lime or gypsum, thereby significantly improving the strength or performance of the material. However, with the development of the cement industry in recent years, the resources of high-activity admixtures have become increasingly scarce, and the proportion of medium- and low-activity admixtures in cement has increased.

[0003] Cement grinding aids are added during the cement grinding stage. By grinding cement finely and chemically stimulating the effects of amines and inorganic salts, cement strength is improved, achieving the purpose of reducing the amount of clinker and increasing the amount of admixtures. Taking masonry cement M32.5 as an example, when commercially available ordinary cement grinding aids are used, the clinker content is about 58% and the admixture content is about 40%; but this is still far from the upper limit specified by the national standard. If the grinding aid can be improved, it is expected to further increase the content of medium and low-activity admixtures in cement.

[0004] For example, patent application CN104909603B discloses a cement grinding aid for masonry cement, which is composed of the following components: water-based polymer, cellulose ether, ethylene glycol, sucrose ester; the invention has a better grinding aid effect, and at the same time, through air entrainment and stabilization effects, the cement mortar has better construction performance during the construction process. For another example, patent application CN117682891A discloses a composite grinding aid for low-carbon and low-heat cement clinker and its preparation method, which is composed of the following components: DMDAAC-co-AA, DMC-co-AA, alcohol amine, polyol, molasses, graphene oxide; the invention can greatly improve the dispersibility and early strength of low-carbon and low-heat cement clinker by introducing amphoteric surfactant intermediates and components such as graphene oxide. For example, patent application CN118108525A discloses a high-strength composite cement grinding aid and a preparation method thereof. The cement grinding aid comprises the following components: triethanolamine, pentaerythritol, methyl hydroxyethyl cellulose, sodium fluorosilicate, and molasses. The cement grinding aid of the invention has the characteristics of good grinding effect and significant strength improvement ability, and the preparation method is simple and easy to work and produce.

[0005] It can be seen that the existing cement grinding aids can achieve improvements in cement performance (including stability, dispersibility, cement strength and other performance); however, when medium and low activity admixtures are the main admixtures, the existing grinding aids still have at least the following two major defects.

[0006] First, most of the existing cement grinding aids work on clinker and are not very targeted at medium and low activity admixtures; they are generally effective on masonry cements mainly composed of medium and low activity admixtures, especially when high-aluminum, porous medium and low activity admixtures, such as black stone, volcanic ash, etc., are added in large quantities, which often leads to low 28d strength of masonry cement, thereby limiting the amount of medium and low activity admixtures added and unable to be increased.

[0007] Secondly, in addition to the strength requirements, masonry cement also has great requirements for cement working performance; the addition of medium and low activity admixtures has an adsorption effect on water, which increases the water demand of cement, and thus leads to a decrease in cement working performance; the use of traditional cement grinding aids accelerates cement hydration to enhance strength, but also leads to a faster early cement hydration rate, and the cement loses fluidity prematurely, affecting the construction performance of masonry cement.

[0008] In view of this, the present invention is proposed. Summary of the invention

[0009] The first purpose of the present invention is to provide a carbon reduction cement grinding aid, which is mainly used to solve the problem that traditional grinding aids are difficult to adapt to cement products with high content of medium and low activity admixtures, and to solve the defect that the hydration rate is fast and the cement construction performance is reduced when adding traditional grinding aids.

[0010] The second object of the present invention is to provide a method for preparing the carbon reduction type cement grinding aid, which is simple and easy to implement and suitable for mass production and construction application.

[0011] The third object of the present invention is to provide the use of the carbon reduction type cement grinding aid in cement.

[0012] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0013] A carbon reduction cement grinding aid, comprising the following components in parts by weight:

[0014] 15-40 parts of modified alcohol amine;

[0015] 5 to 20 parts of hydration control component;

[0016] 3 to 15 parts of masking component;

[0017] 3 to 15 parts of early strength component;

[0018] The modified alcohol amine is obtained by adding diol amine and acrylic ester compound.

[0019] A method for preparing the carbon reduction type cement grinding aid comprises the following steps: fully mixing modified alcohol amine, a hydration control component, a masking component, an early strength component and water to obtain the carbon reduction type cement grinding aid.

[0020] The carbon reduction type cement grinding aid is used in building materials.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a carbon reduction type grinding aid, which can be effectively adapted to cement products with large amounts of medium and low activity admixtures, and can still maintain cement strength performance when reducing the clinker content of masonry cement, while improving cement construction performance. Compared with conventional configurations, when the carbon reduction type grinding aid of the present invention is used, the cement clinker content is reduced by more than 5%, and the content of medium and low activity admixtures is increased by more than 20%. At this time, the prepared cement still maintains consistency in various strength performance indicators.

[0023] Specifically, the present invention achieves the technical effects of improving the hydration rate of clinker, strengthening the activation of medium and low activity admixtures, and improving the structure of hydration products in a synergistic manner by designing four core components including modified alcohol amine, hydration control component, masking component and early strength component. Thus, the present invention works from both the clinker and medium and low activity admixtures to reduce the cement clinker dosage while improving the strength and working performance of cement, and improves the construction performance by improving the structure of hydration products. DETAILED DESCRIPTION

[0024] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but those skilled in the art will appreciate that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. Those who do not specify the manufacturer for reagents or instruments used are conventional products that can be purchased commercially. In addition, the terms "first", "second" and "third" are only used for descriptive purposes and cannot be interpreted as indicating or implying relative importance.

[0025] The first aspect of the present invention is to provide a carbon reduction type cement grinding aid.

[0026] The carbon-reducing cement grinding aid of the present invention addresses the defects of the prior art and is particularly suitable for medium- and low-activity admixtures. By adopting the three technical routes of "increasing the hydration rate of clinker", "activating medium- and low-activity admixtures", and "improving the structure of hydration products", when the carbon-reducing cement grinding aid is applied to masonry cement materials, it can effectively reduce the clinker dosage and increase the use scenarios of medium- and low-activity admixtures, while keeping the cement strength performance consistent and improving the construction performance of cement.

[0027] The carbon reduction cement grinding aid comprises the following components by weight: 15-40 parts of modified alcohol amine; 5-20 parts of hydration control component; 3-15 parts of masking component; 3-15 parts of early strength component; wherein the modified alcohol amine is obtained by addition of diol amine and acrylate compound.

[0028] As an optional embodiment, the mass fractions of each component in the carbon reduction cement grinding aid include but are not limited to: modified alcohol amine 15, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40; hydration control components 5, 6, 8, 10, 11, 12, 14, 15, 18, 20; masking components 3, 5, 6, 7, 8, 9, 10, 12, 15; early strength components 3, 5, 6, 7, 8, 9, 10, 12, 15; the mass fractions are dimensionless, and the mass fraction of each component can take any point value listed above, or can take the numerical range formed by any two of the above point values.

[0029] As a preferred embodiment, the carbon reduction cement grinding aid includes the following components by weight percentage: 20% to 30% modified alcohol amine, 5% to 15% hydration control component, 5% to 10% masking component, 5% to 10% early strength component, and the balance is water.

[0030] As a preferred embodiment, the diolamine includes one or both of diethanolamine and diisopropanolamine.

[0031] As a preferred embodiment, the acrylic acid ester compound includes one or both of methyl acrylate and ethyl acrylate.

[0032] In the present invention, it is preferred to use low molecular weight small molecule reactants to obtain modified alcohol amines through addition polymerization; specifically, the diol amines used in the present invention are all secondary amines, and the -NH group of the secondary amine and the alkenyl group of the acrylate undergo Michael addition reaction, thereby grafting the secondary amine to form a composite structure of tertiary amine and ester group.

[0033] The modified alcoholamine used in the present invention has a slow-release hydration-promoting effect; when cement is hydrated in the earliest stage, the modified alcoholamine has little effect on cement hydration, but as hydration proceeds, the modified alcoholamine is hydrolyzed under the action of alkali, and the complexing functional group is released, and the hydration-promoting effect on cement is enhanced. This slow-release hydration-promoting effect not only promotes cement hydration, but also reduces the negative impact on early hydration, which is beneficial to the working performance of cement.

[0034] As a preferred embodiment, the usage ratio of the diol amine and the acrylic ester compound is 1.2-1.5:1 based on the amount of substance.

[0035] As a preferred embodiment, the preparation method of the modified alcohol amine comprises the following steps: the diol amine, the acrylic ester compound and the catalyst are fully mixed to obtain the modified alcohol amine; it is worth noting that the synthesis method does not require additional restrictions on the temperature and atmosphere environment, and can be carried out in a non-aqueous environment at room temperature.

[0036] As a more preferred embodiment, the catalyst includes one or both of sodium acetate and sodium formate; as a reference, the amount of the catalyst is 1% to 3% of the mass of the reactants.

[0037] As a more preferred embodiment, the diolamine and the catalyst are used as the base liquid, the acrylic ester compound is added dropwise to the base liquid, mixed and reacted for 120 min to 180 min after the addition, and filtered and purified to obtain the modified alcoholamine.

[0038] As a more preferred embodiment, the mixing can be assisted by oscillation, stirring, centrifugation, ultrasound, etc., which helps to accelerate the dispersion and obtain a relatively uniform dispersion system; stirring is further preferred, and the stirring speed can be selected from 300rpm to 1000rpm.

[0039] As a preferred embodiment, the hydration control component includes a polyhydroxy sugar derivative and sodium gluconate (ie, these two components are simultaneously included to work in a superimposed manner); wherein the polyhydroxy sugar derivative includes at least one of sorbitol, xylitol or sucrose.

[0040] As a more preferred embodiment, the mass ratio of the polyhydroxy sugar derivative and the sodium gluconate is (2-5):1, including but not limited to 2:1, 2.2:1, 2.5:1, 2.8:1, 3:1, 3.2:1, 3.5:1, 3.8:1, 4:1, 4.2:1, 4.5:1, 4.8:1, and 5:1, any one or a ratio interval consisting of any two of them.

[0041] As a preferred embodiment, the masking component is an organic acid salt compound, and the masking component includes at least one hydrophobic end group and at least one hydrophilic end group.

[0042] As a more preferred embodiment, the masking component includes at least one of sodium butyrate, sodium naphthalene sulfonate or sodium methylene dinaphthalene sulfonate.

[0043] As a preferred embodiment, the early strength component includes calcium salt.

[0044] As a more preferred embodiment, the calcium salt includes at least one of calcium formate, calcium acetate or calcium chloride.

[0045] The invention is specifically designed according to the development process of cement strength and cement mixing raw materials, and then achieves the balanced effect on admixture cost and working performance through a special grinding aid.

[0046] Specifically, cement strength usually includes the following evolution process starting from the time when water is added to cement and mixed: setting stage (after cement comes into contact with water, the clinker minerals in cement begin to react chemically with water and produce hydration products), hardening stage (as the hydration reaction proceeds, the hydration products gradually increase and the cement paste gradually becomes hard), and maturation stage (when the hydration reaction proceeds to a certain extent, the strength development of cement tends to stabilize); among them, the setting stage also includes the cement hydration induction period, which is the stage from the beginning of the hydration reaction to the acceleration of the hydration reaction after water is added to cement.

[0047] In the selection of components of the carbon reduction cement grinding aid described in the present invention, by adopting modified alcohol amine and hydration control component, the enrichment of cations in the silicon-rich layer can be changed during the cement hydration induction period, so that the hydration products are dispersed in the cement paste, and the hydration rate of the clinker is improved. At the same time, through the superposition of modified alcohol amine and early strength component, the early hydration rate of cement is accelerated, the alkalinity of the early cement paste is increased, and the hydration control component prolongs the arrival of the induction period, so that the reaction time of medium and low activity admixtures with alkali is prolonged, thereby stimulating the activity of the admixture. At the same time, the masking component reduces the adsorption of water by high aluminum and porous admixtures, reduces the porosity of hydration products, and at the same time, the increase in the hydration rate of clinker increases the hydration products. The two effects are superimposed, and the structural morphology of the hydration products is improved; under the condition of reducing the water demand of cement, the cement has better fluidity at the same water-cement ratio.

[0048] Furthermore, in order to avoid excessive hydration due to the superposition of modified alcohol amine and early strength component, the hydration control component of the present invention inhibits the early hydration of cement to a certain extent, thereby avoiding the deterioration of construction performance caused by premature hydration of cement, facilitating the combination of cement and mixing water, and improving the foaming performance of cement.

[0049] Therefore, the carbon-reducing grinding aid of the present invention achieves the reduction of clinker dosage and the increase of medium- and low-activity admixture dosage during cement preparation without reducing cement performance through the three technical routes of "increasing clinker hydration rate", "activating medium- and low-activity admixtures", and "improving the structure of hydration products". At the same time, through the activation of medium- and low-activity admixtures, the absorption of calcium hydroxide produced by cement hydration is promoted and calcium silicate hydrate with a low calcium-silicon ratio is generated, thereby improving the viscosity of cement and effectively optimizing the construction performance of cement.

[0050] The second aspect of the present invention is to provide a method for preparing the carbon reduction type cement grinding aid.

[0051] The preparation method comprises the following steps: fully mixing modified alcohol amine, hydration control component, masking component, early strength component and water to obtain the carbon reduction type cement grinding aid.

[0052] As a preferred embodiment, the mixing can be assisted by oscillation, stirring, centrifugation, ultrasound, etc., which helps to accelerate dispersion and obtain a relatively uniform grinding aid.

[0053] As a more preferred embodiment, the mixing includes: maintaining the mixing in a stirring state for 20 min to 50 min.

[0054] As a preferred embodiment, combined with construction convenience and actual application scenarios, the modified alcohol amine, hydration control component, masking component and early strength component can be pre-mixed, encapsulated, stored and transported, and then the pre-mixed grinding aid can be further mixed with water during cement preparation.

[0055] The third aspect of the present invention is to provide use of the carbon reduction cement grinding aid as described in the first aspect in building materials.

[0056] It is understandable that the use includes but is not limited to: cement admixtures containing the carbon-reducing cement grinding aid, cement products to which the carbon-reducing cement grinding aid is applied, building materials or buildings made of cement to which the carbon-reducing cement grinding aid is applied, and preparation methods or construction methods of the above-mentioned products, etc. The present invention does not impose any restrictions on the specific methods of use. Under the premise of containing the carbon-reducing cement grinding aid as described in the first aspect, any product or method can be used as an implementation of the third aspect of the present invention.

[0057] As a preferred embodiment, the use includes: a cement material, including clinker, medium- and low-activity admixtures and the carbon-reducing cement grinding aid; wherein the clinker is added in an amount of 40% to 50%, and the medium- and low-activity admixtures are added in an amount of 45% to 55%.

[0058] It is understandable that the above-mentioned cement material can be based on P·II, P·O, P·C, M32.5 cement, supplemented with the carbon reduction cement grinding aid of the present invention. As a more preferred embodiment, the amount of the carbon reduction cement grinding aid is 0.5wt.‰ to 1wt.‰ based on the material entering the mill.

[0059] Example 1

[0060] The formula of this embodiment is: by mass, 30% modified alcohol amine, 13% hydration control component, 5% masking component, 10% early strength component, and the balance is water. The components are added to clean water at room temperature and mixed for 40 minutes to obtain the finished carbon reduction type grinding aid of this embodiment.

[0061] The preparation method of the modified alcohol amine is as follows: diisopropanolamine and methyl acrylate are weighed as raw materials in a mass ratio of 1.2:1, and then the mass of the two and 1% of sodium ethoxide are added to the diisopropanolamine as a catalyst, and methyl acrylate is slowly added dropwise to the mixture of diisopropanolamine and sodium ethoxide within 30 minutes, and the modified alcohol amine is obtained after stirring for 2 hours.

[0062] The hydration control component is a combination of sorbitol and sodium gluconate (the mass ratio of the two is 10:3).

[0063] The masking component is sodium methylene dinaphthalene sulfonate.

[0064] The early strength component is a combination of calcium formate and calcium chloride (the mass ratio of the two is 1:1).

[0065] Example 2

[0066] The formula of this embodiment is: by mass, 30% modified alcohol amine, 8% hydration control component, 5% masking component, 12% early strength component, and the balance is water. Each component is added to clean water at room temperature and mixed and stirred for 40 minutes to obtain the finished carbon reduction type grinding aid of this embodiment.

[0067] The preparation method of the modified alcohol amine is as follows: diethanolamine and methyl acrylate are weighed as raw materials in a mass ratio of 1.5:1, and then the mass of the two and 1% of sodium ethoxide are added to the diethanolamine as a catalyst, and methyl acrylate is slowly added dropwise to the mixture of diethanolamine and sodium ethoxide within 30 minutes, and the modified alcohol amine is obtained after stirring for 3 hours.

[0068] The hydration control component is a combination of sucrose and sodium gluconate (the mass ratio of the two is 5:3).

[0069] The masking component is sodium naphthalenesulfonate.

[0070] The early strength component is a combination of calcium acetate and calcium chloride (the mass ratio of the two is 5:7).

[0071] Example 3

[0072] The formula of this embodiment is: by mass, 30% modified alcohol amine, 8% hydration control component, 5% masking component, 5% early strength component, and the balance is water. Each component is added to clean water at room temperature and mixed for 40 minutes to obtain the finished carbon reduction type grinding aid of this embodiment.

[0073] The preparation method of the modified alcohol amine is as follows: diethanolamine and ethyl acrylate are weighed as raw materials in a mass ratio of 1.5:1, and then the mass of the two and 1% of sodium ethoxide are added to the diethanolamine as a catalyst, and ethyl acrylate is slowly added dropwise to the mixture of diethanolamine and sodium ethoxide within 30 minutes, and the modified alcohol amine is obtained after stirring for 3 hours.

[0074] The hydration control component is a combination of xylitol and sodium gluconate (the mass ratio of the two is 5:3).

[0075] The masking component is sodium methylene dinaphthalene sulfonate.

[0076] Calcium chloride is selected as the early strength component.

[0077] Example 4

[0078] The formula of this embodiment is: by mass, 30% modified alcohol amine, 13% hydration control component, 5% masking component, 10% early strength component, and the balance is water. Each component is added to clean water at room temperature and mixed for 50 minutes to obtain the finished carbon reduction type grinding aid of this embodiment.

[0079] The preparation method of the modified alcohol amine is as follows: diethanolamine and ethyl acrylate are weighed as raw materials in a mass ratio of 1.3:1, and then the mass of the two and 2% of sodium ethoxide are added to the diethanolamine as a catalyst, and ethyl acrylate is slowly added dropwise to the mixture of diethanolamine and sodium ethoxide within 30 minutes, and the modified alcohol amine is obtained after stirring for 2.5 hours.

[0080] The hydration control component is a combination of xylitol and sodium gluconate (the mass ratio of the two is 10:3).

[0081] The masking component is sodium methylene dinaphthalene sulfonate.

[0082] Calcium chloride is selected as the early strength component.

[0083] Comparative Example 1

[0084] The formula of this comparative example is: by mass, 10% triethanolamine, 20% diethanol monoisopropanolamine, 5% molasses, 10% industrial salt, and the balance is water. Add each component to clean water at room temperature and mix and stir for 60 minutes to obtain the finished product of the conventional grinding aid of this comparative example.

[0085] Comparative Example 2

[0086] The formula of this comparative example is: by mass, 30% diethanol monoisopropanolamine, 5% molasses, 10% industrial salt, and the balance is water. Each component is added to clean water at room temperature and mixed and stirred for 60 minutes to obtain the finished product of the conventional grinding aid of this comparative example.

[0087] Comparative Example 3

[0088] The formula of this comparative example is: by mass, 30% diethanol monoisopropanolamine, 5% molasses, 5% sodium thiocyanate, and the balance is water. The components are added to clean water at room temperature and mixed and stirred for 60 minutes to obtain the finished product of the conventional grinding aid of this comparative example.

[0089] Comparative Example 4

[0090] The formula of this comparative example is: by mass, 20% diethanol monoisopropanolamine, 10% monoethanol diisopropanolamine, 5% molasses, 10% industrial salt, and the balance is water. The components are added to clean water at room temperature and mixed and stirred for 60 minutes to obtain the finished product of the conventional grinding aid of this comparative example.

[0091] Test Example 1

[0092] Taking the carbon reduction type grinding aid prepared in Example 1 as an example, the performance of cement materials prepared at different cement clinker dosages was explored.

[0093] The test example uses the following experimental masonry cement, and the formula is: in terms of mass percentage, 40% to 50% clinker, 5% desulfurized gypsum, 15% limestone, and 30% to 40% medium- and low-activity admixtures (the medium- and low-activity admixtures used in the test example mainly include tuff, shale, siliceous slag, fly ash, etc.); the mass percentage gradient of the clinker is provided in Table 1 below, and the corresponding mass percentage of the medium- and low-activity admixtures is calculated based on the total mass percentage being 100%. For example, when the clinker is 40wt.%, the corresponding medium- and low-activity admixture used is 40wt.%, and so on.

[0094] The carbon reduction type grinding aid described in Example 1 was added to each test masonry cement (according to 1‰ of its total mass), and then ground respectively; the grinding time of each cement was kept consistent, and then the strength performance test of the prepared cement was carried out (the test method was carried out in accordance with GB / T 17671), and the results are shown in Table 1.

[0095] Table 1

[0096]

[0097] As can be seen from Table 1, in this test example, it is basically satisfied that when the cement clinker content increases, the compressive strength of the corresponding masonry cement increases, which is in line with the conventional understanding in the field. However, even when the cement content is 40wt.%, it also meets the strength index requirements of 3d and 28d in the national standard GB / T3183-2017 "Masonry Cement".

[0098] Test Example 2

[0099] The following experimental masonry cement was uniformly used in this test example, and the formula was: in terms of mass percentage, 40% clinker, 5% desulfurized gypsum, 15% limestone, and 40% medium and low activity admixtures; the grinding aids prepared in each embodiment and comparative example were added to each experimental masonry cement (according to 1‰ of its total mass), and the grinding was carried out separately; the grinding time of each cement was kept consistent, and then the physical properties of the prepared cement were tested (the test method was the same as in Test Example 1), and the results are shown in Table 2.

[0100] Table 2

[0101] 3-day compressive strength / MPa 28-day compressive strength / MPa Example 1 16.8 38.5 Example 2 17.3 41.2 Example 3 18.0 39.4 Example 4 17.5 40.1 Comparative Example 1 13.8 32.3 Comparative Example 2 14.2 33.0 Comparative Example 3 13.5 30.7 Comparative Example 4 13.9 31.5

[0102] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. A carbon reduction cement grinding aid, characterized in that: It includes the following components by weight: 15-40 parts of modified alcohol amine; 5 to 20 parts of hydration control component; 3 to 15 parts of masking component; 3 to 15 parts of early strength component; The modified alcohol amine is obtained by adding diol amine and acrylic ester compound.

2. A carbon reduction cement grinding aid according to claim 1, characterized in that: The carbon reduction cement grinding aid comprises the following components by weight percentage: 20% to 30% of modified alcohol amine, 5% to 15% of hydration control component, 5% to 10% of masking component, 5% to 10% of early strength component, and the balance is water.

3. A carbon reduction cement grinding aid according to claim 1, characterized in that: The diolamine includes one or both of diethanolamine and diisopropanolamine; And / or, the acrylate compound includes one or both of methyl acrylate and ethyl acrylate.

4. A carbon reduction cement grinding aid according to claim 1, characterized in that: The preparation method of the modified alcohol amine comprises the following steps: fully mixing the diol amine, the acrylic ester compound and the catalyst, and obtaining the modified alcohol amine through addition reaction; Preferably, the catalyst comprises at least one of sodium acetate or sodium methoxide; Preferably, the amount of the catalyst used is 1% to 3% of the sum of the mass of the diolamine and the acrylate compound.

5. A carbon reduction cement grinding aid according to claim 1, characterized in that: The masking component includes an organic acid salt compound, and the masking component includes at least one hydrophobic end group and at least one hydrophilic end group; Preferably, the masking component comprises at least one of sodium butyrate, sodium naphthalene sulfonate or sodium methylene dinaphthalene sulfonate.

6. A carbon reduction cement grinding aid according to claim 1, characterized in that: The early strength component includes calcium salt; Preferably, the calcium salt comprises at least one of calcium formate, calcium acetate or calcium chloride.

7. A carbon reduction cement grinding aid according to claim 1, characterized in that: The hydration control component includes a polyhydroxy sugar derivative and sodium gluconate; wherein the polyhydroxy sugar derivative includes at least one of sorbitol, xylitol or sucrose; Preferably, the mass ratio of the polyhydroxy sugar derivative to the sodium gluconate is (2-5):

1.

8. The method for preparing the carbon reduction cement grinding aid according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: fully mixing modified alcohol amine, a hydration control component, a masking component, an early strength component and water to obtain the carbon reduction type cement grinding aid.

9. Use of the carbon reduction cement grinding aid according to any one of claims 1 to 7 in building materials.

10. The use according to claim 9, characterized in that It comprises a cement material, which is obtained by mixing clinker, medium- and low-activity mixed materials and the carbon-reducing cement grinding aid; The content of the clinker is 40-50%, and the content of the medium-low activity admixture is 45-55%. Preferably, based on the material fed into the mill, the amount of the carbon reduction cement grinding aid added is 0.5wt.‰ to 1wt.‰.

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