Comprehensive grinding aid for enhancing yield increase and preparation method thereof

Abstract

The invention provides a comprehensive grinding aid for enhancing yield increase and a preparation method thereof. The comprehensive grinding aid for enhancing yield improvement comprises the following raw materials: a modified polycarboxylic acid compound, polyhydric alcohol, an inorganic compound, a surfactant and water, according to the characteristics and production process conditions of the cement, proper grinding aid components are selected, and the formula proportion of the grinding aid is finely adjusted, so that the particle uniformity of the cement is improved, the grinding machine yield of the cement is improved, the strength of the cement is improved, and the cement grinding aid has wide application value.

Description

Technical Field

[0001] The invention relates to the technical field of grinding aids, and in particular to a comprehensive grinding aid for enhancing production and a preparation method thereof. Background Art

[0002] As an important building material, cement plays an irreplaceable role in infrastructure construction, real estate development, industrial construction and other fields. It is the cornerstone of modern social construction and supports the rapid development of the national economy. With the acceleration of global urbanization and the continuous advancement of infrastructure construction, the demand for cement continues to grow. In recent years, the cement industry has faced many challenges and opportunities in terms of technological innovation, capacity improvement, and environmental protection requirements. On the one hand, in order to meet the growing market demand, cement companies need to improve production efficiency and output; on the other hand, with the enhancement of environmental awareness and the country's strict requirements for energy conservation and emission reduction, the cement industry must reduce energy consumption and pollutant emissions. Grinding aids are chemical admixtures added during cement grinding. Their main function is to improve grinding efficiency, reduce energy consumption, and improve cement performance.

[0003] During the cement grinding process, the grinding efficiency is reduced due to the friction and adhesion between cement particles. Grinding aids can be adsorbed on the surface of cement particles, reducing the friction between particles, thereby improving the grinding efficiency. Grinding aids can also change the surface properties of cement particles, making them easier to break and grind, further improving the grinding efficiency. By improving the grinding efficiency, grinding aids can reduce the energy consumption in the cement grinding process. According to statistics, adding an appropriate amount of grinding aids can reduce the power consumption of cement grinding. Reducing energy consumption can not only reduce the cost of cement production, but also meet the national policy requirements of energy conservation and emission reduction.

[0004] However, traditional grinding aids mainly include alcoholamine compounds, inorganic salts, etc. Although these grinding aids can improve grinding efficiency and improve cement performance to a certain extent, they also have some limitations. Traditional grinding aids often only have a single grinding aid function and have limited improvement on cement performance. For example, alcoholamine grinding aids mainly improve grinding efficiency, but the effect on improving cement strength is not obvious. Different types of cement and grinding equipment have different adaptability to grinding aids. Traditional grinding aids may not work best in some cases and may even have an adverse effect on cement performance. Some traditional grinding aids contain ingredients that are harmful to the environment, such as heavy metals. With the improvement of environmental protection requirements, the use of these grinding aids has been restricted. In order to overcome the limitations of traditional grinding aids and meet the needs of cement industry development, it has become a top priority to develop comprehensive grinding aids that enhance production.

[0005] In view of the problems existing in the prior art, the present application aims to develop a grinding aid that can solve the problems of low early strength of cement, uneven distribution of cement, and low yield of cement grinding stations. Summary of the invention

[0006] Purpose of the invention:

[0007] The purpose of the present invention is to provide a comprehensive grinding aid for enhancing production and improving production, so as to solve the problems of low early strength of cement, uneven distribution of cement and low production of cement grinding table.

[0008] The technical solution of the present invention:

[0009] A comprehensive grinding aid for enhancing production and improving production, characterized in that the raw materials of the comprehensive grinding aid for enhancing production and improving production include: modified polycarboxylic acid compounds, polyols, inorganic compounds, surfactants, and water.

[0010] Furthermore, the comprehensive grinding aid for enhancing production includes, by weight, 5 to 10 parts of modified polycarboxylic acid compounds, 15 to 25 parts of polyols, 20 to 40 parts of inorganic compounds, 3 to 6 parts of surfactants, and 40 to 60 parts of water.

[0011] Furthermore, the modified polycarboxylic acid compound is prepared by reacting maleic anhydride, diethanol monoisopropanolamine, cinnamyl alcohol polyvinyl ether and acrylic acid.

[0012] Furthermore, the preparation method of the modified polycarboxylic acid compound comprises the following steps:

[0013] S1: Add maleic anhydride to a reaction bottle, then slowly add diethanol monoisopropanolamine, start stirring, slowly heat to 60-80°C, react for 2-4 hours, and obtain an intermediate;

[0014] S2: Take another reaction bottle, add deionized water, dissolve cinnamyl alcohol polyvinyl ether therein, then add acrylic acid and the intermediate prepared in step S1 in sequence, stir evenly, heat to 60-80° C., then slowly add initiator, and react for 4-6 hours;

[0015] S3: After the reaction is completed, the pH value is adjusted to 7-8, and then filtered to obtain a modified polycarboxylic acid compound.

[0016] Furthermore, the mass ratio of the cinnamyl alcohol polyvinyl ether, acrylic acid and the intermediate prepared in step S1 is 3 to 5:2 to 3:1.

[0018] Furthermore, the initiator is ammonium persulfate, and the amount of the initiator used is 1 to 3% of the total mass of cinnamyl alcohol polyvinyl ether, acrylic acid and the intermediate prepared in step S1.

[0019] The preparation method of the cinnamyl alcohol polyvinyl ether comprises the following steps:

[0020] SS1: weigh cinnamyl alcohol and ethylene oxide and set aside;

[0021] SS2: Add the cinnamyl alcohol weighed in step SS1 into a high-pressure reactor, then add potassium hydroxide, slowly stir, set the temperature to 120-150° C., and the pressure to 0.2-0.5 MPa;

[0022] SS3: When the temperature reaches 120-150°C, slowly introduce the ethylene oxide weighed in step SS1 and react for 8-12 hours;

[0023] SS4: After the reaction is completed, the mixture is cooled to room temperature, and the product is filtered and washed to obtain cinnamyl alcohol polyoxyethylene ether.

[0024] Furthermore, the mass ratio of cinnamyl alcohol to ethylene oxide is 1:5-12.

[0025] Furthermore, the polyol is a mixture of one or more of ethylene glycol and propylene glycol.

[0026] Furthermore, the inorganic compound is a mixture of one or more of sodium sulfate, sodium silicate and sodium chloride.

[0027] Furthermore, the surfactant is a mixture of one or more of sodium dodecylbenzene sulfonate, lignin sulfonate, and alkylnaphthalene sulfonate.

[0028] The present application also provides a method for preparing a comprehensive grinding aid for enhancing production, which is characterized by comprising the following steps:

[0029] Step 1: Add an appropriate amount of water to a reaction vessel, slowly add the polyol, stirring at a speed of 200 to 500 rpm, to fully dissolve it in the water;

[0030] Step 2: Add the inorganic compound and surfactant to step 1 and continue stirring for 30 to 60 minutes;

[0031] Step 3: Finally, slowly add the modified polycarboxylic acid compound into step 2, stirring for 1 to 2 hours, to obtain the enhanced and yield-increasing comprehensive grinding aid.

[0032] Functional groups such as carboxyl in the molecular structure of modified polycarboxylic acid compounds can form complexes with calcium ions in cement, accelerate the hydration reaction of cement, promote the formation of early hydration products, and thus improve the early strength of cement. It can be adsorbed on the surface of cement particles, reduce the friction and adhesion between particles, make the grinding process smoother, and reduce energy consumption. It can optimize the particle size distribution of cement particles, reduce over-grinding, improve grinding efficiency, and reduce energy consumption. Through the surface activity, the cement particles are dispersed more evenly during the grinding process, avoiding particle agglomeration, so that the cement particle size distribution is more reasonable. It has a selective adsorption effect on cement particles of different mineral phases, adjusts the grinding behavior of each mineral phase, and promotes the uniformity of the overall distribution of cement particles. Polyols can react with tricalcium aluminate (C3A) in cement to form hydration products with high early strength. Polyols can also promote the hydration process of cement, accelerate the early hydration reaction speed, improve early strength, play a lubricating role, reduce the friction coefficient between cement particles, reduce energy loss during grinding, improve cement fluidity, make the material transmission during grinding smoother, improve grinding efficiency, and reduce energy consumption. Polyols form a thin film on the surface of cement particles, reduce the adhesion between particles, make cement particles easier to disperse, and thus make cement distribution more uniform. Inorganic compounds can be used as active admixtures of cement, participate in the hydration reaction of cement, and improve early strength. Some ions in inorganic compounds can accelerate the hydration reaction of cement, promote early strength development, adjust the electrostatic balance of the grinding system, reduce electrostatic adsorption between particles, improve grinding efficiency, and reduce energy consumption. Surfactants can form a uniform adsorption layer on the surface of cement particles to prevent particle agglomeration and make cement particles more evenly dispersed. By adjusting the charge distribution on the surface of particles, electrostatic repulsion is generated between cement particles, promoting the dispersion and uniform distribution of particles.

[0033] Beneficial effects:

[0034] The enhanced and yield-increasing comprehensive grinding aid of the present invention improves the particle uniformity of cement, increases the cement grinding yield, and improves the cement strength by modifying the polycarboxylic acid compound and fine-tuning the grinding aid formula ratio, and exerting the effective effect of the polycarboxylic acid compound modification and the mutual coordination of various components, and has a wide range of application value. DETAILED DESCRIPTION

[0035] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0036] Unless otherwise specified, the chemical reagents used in the present invention are all commercially available analytically pure.

[0037] Commercially available conventional polycarboxylic acid compounds were purchased from Jiangsu Xiangtai Yingxin Technology Co., Ltd.

[0038] Preparation of cinnamyl alcohol polyvinyl ether a:

[0039] SS1: weigh 10 g of cinnamyl alcohol and 50 g of ethylene oxide and set aside;

[0040] SS2: Add the cinnamyl alcohol weighed in step SS1 into a high-pressure reactor, then add 2 g of potassium hydroxide, stir slowly, set the temperature to 120°C, and the pressure to 0.5 MPa;

[0041] SS3: When the temperature reaches 120°C, slowly introduce the ethylene oxide weighed in step SS1 and react for 8 hours;

[0042] SS4: After the reaction is completed, the mixture is cooled to room temperature, and the product is filtered and washed to obtain cinnamyl alcohol polyoxyethylene ether a.

[0043] Preparation of cinnamyl alcohol polyvinyl ether b:

[0044] The difference between this preparation and cinnamyl alcohol polyoxyethylene ether a is that 50 g of ethylene oxide weighed in step SS1 is replaced by 120 g of ethylene oxide.

[0045] Preparation of cinnamyl alcohol polyvinyl ether c:

[0046] The difference between this preparation and cinnamyl alcohol polyoxyethylene ether a is that 50 g of ethylene oxide weighed in step SS1 is replaced by 20 g of ethylene oxide.

[0047] Preparation of cinnamyl alcohol polyvinyl ether d:

[0048] The difference between this preparation and cinnamyl alcohol polyoxyethylene ether a is that 50 g of ethylene oxide weighed in step SS1 is replaced by 150 g of ethylene oxide.

[0049] Preparation of modified polycarboxylic acid compound A:

[0050] S1: Add 5 g of maleic anhydride into a reaction bottle, then slowly add 5 g of diethanol monoisopropanolamine, start stirring, slowly heat to 60°C, react for 2 hours, and obtain an intermediate;

[0051] S2: Take another reaction bottle, add 1.5L deionized water, dissolve 30g of cinnamyl alcohol polyvinyl ether a therein, then add 20g of acrylic acid and 10g of the intermediate prepared in step S1 in sequence, stir evenly, heat to 80°C, then slowly add 0.5g of ammonium persulfate, and react for 6 hours;

[0052] S3: After the reaction is completed, the pH value is adjusted to 7, and then filtered to obtain a modified polycarboxylic acid compound.

[0053] Preparation of modified polycarboxylic acid compound B:

[0054] The difference between the present preparation and the modified polycarboxylic acid compound A is that 30 g of cinnamyl alcohol polyvinyl ether a in step S2 is dissolved therein, and then 20 g of acrylic acid is added in sequence to replace 20 g of cinnamyl alcohol polyvinyl ether a dissolved therein, and then 30 g of acrylic acid is added in sequence.

[0055] Preparation of modified polycarboxylic acid compound C:

[0056] The difference between the present preparation and the modified polycarboxylic acid compound A is that 30 g of cinnamyl alcohol polyvinyl ether a in step S2 is replaced by 30 g of cinnamyl alcohol polyvinyl ether b.

[0057] Preparation of modified polycarboxylic acid compound D:

[0058] The difference between the present preparation and the modified polycarboxylic acid compound A is that 30 g of cinnamyl alcohol polyvinyl ether a in step S2 is replaced by 30 g of cinnamyl alcohol polyvinyl ether c.

[0059] Preparation of modified polycarboxylic acid compound E:

[0060] The difference between the present preparation and the modified polycarboxylic acid compound A is that 30 g of cinnamyl alcohol polyvinyl ether a in step S2 is replaced by 30 g of cinnamyl alcohol polyvinyl ether d.

[0061] Preparation of comprehensive grinding aids for enhancing production:

[0062] Step 1: Add an appropriate amount of water to a reaction vessel, slowly add the polyol, stirring at a speed of 300 rpm, to fully dissolve it in the water;

[0063] Step 2: Add the inorganic compound and surfactant to the reaction vessel of step 1 and continue stirring for 60 minutes;

[0064] Step 3: Finally, slowly add the modified polycarboxylic acid compound into step 2, stirring for 2 hours, to obtain the comprehensive grinding aid for enhancing production.

[0065] Examples 1 to 6

[0066] The preparation was carried out according to the above-mentioned preparation method of the comprehensive grinding aid for enhancing production and improving. Table 1 is the ingredient list of the comprehensive grinding aid for enhancing production and improving of Examples 1 to 6, calculated by weight.

[0067] Table 1 Ingredients of the comprehensive grinding aid for enhancing production of Examples 1 to 6

[0068]

[0069]

[0070] Comparative Examples 1 to 3

[0071] The enhanced and yield-increasing comprehensive grinding aid was prepared according to the above-mentioned preparation method. Table 2 is the ingredient list of the enhanced and yield-increasing comprehensive grinding aid of Comparative Examples 1 to 3.

[0072] Table 2 Ingredients of the enhanced and improved comprehensive grinding aids for comparative examples 1 to 3

[0073]

[0074] Conduct cement grinding test:

[0075] The formula of cement mill is (mixed by mass percentage): 78% clinker, 5% gypsum, 5% limestone, 12% slag, and 0.1% grinding aid. After the clinker and limestone are put into the crusher and crushed, ensure that the particle size of the material entering the mill is less than 7mm; the crushed clinker, limestone, gypsum and slag are mixed and ground together. Before grinding the mixture, the grinding aids of Examples 1 to 6 and Comparative Examples 1 to 3 are added dropwise to the mixture at a dosage of 0.1%. During the grinding process, the grinding time is fixed to 30min; the performance of the ground cement is tested with reference to GB175-2023 "General Portland Cement", and the 45um sieve residue, specific surface area, 3d and 28d compressive strength are tested; the D50 value of cement is tested using a laser particle size analyzer.

[0076] The blank group consists of a blank sample ground with 78% clinker, 5% gypsum, 5% limestone and 12% slag without adding grinding aids.

[0077] Table 3 Performance of cement with comprehensive grinding aids for enhancing production

[0078]

[0079] It can be seen from Table 3 that the enhanced and yield-increasing comprehensive grinding aid of the present invention can improve the early and late strength of cement, increase the fineness and specific surface area of ​​particles, reduce the D50 value of cement, improve the grinding efficiency, and increase the raw material yield. Specifically, it is shown in: From the comparison between Example 4 and Example 2, it can be seen that when preparing the modified polycarboxylic acid compound, the unreasonable mass ratio of cinnamyl alcohol polyvinyl ether, acrylic acid and intermediate will lead to the effect of the enhanced and yield-increasing comprehensive grinding aid on improving the early strength of cement, the cement fineness and specific surface area will both decrease, the grinding and yield efficiency will decrease, the raw material yield will decrease, and the expected effect will not be achieved; From the comparison between Examples 5 to 6 and Example 2, it can be seen that when preparing the modified polycarboxylic acid compound, the unreasonable mass ratio of cinnamyl alcohol to ethylene oxide in synthesizing cinnamyl alcohol polyoxyethylene ether will lead to the effect of the enhanced and yield-increasing comprehensive grinding aid on improving the early strength of cement, the cement fineness and specific surface area will both decrease, the grinding and yield efficiency will decrease, the raw material yield will decrease, and the expected effect will not be achieved; From Comparative Example 1 and Example 2, it can be seen that without using the modified The modified polycarboxylic acid compound can lead to the effect of the enhanced comprehensive grinding aid on improving the early strength of cement to be worse, the cement fineness and specific surface area to be reduced, the grinding efficiency to be reduced, the raw material yield to be reduced, and the expected effect can not be achieved; Comparative Example 2 is compared with Example 2, it can be seen that replacing the modified polycarboxylic acid compound with the polycarboxylic acid compound on the market can lead to the effect of the enhanced comprehensive grinding aid on improving the early strength of cement to be worse, the cement fineness and specific surface area to be reduced, the grinding efficiency to be reduced, the raw material yield to be reduced, and the expected effect can not be achieved; Comparative Example 3 is compared with Example 2, it can be seen that without adding a surfactant, especially it will lead to the decrease of cement fineness and specific surface area, the decrease of grinding efficiency, and it will also indirectly affect the early strength of cement, resulting in the enhanced comprehensive grinding aid to fail to achieve the expected effect.

[0080] The present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A comprehensive grinding aid for enhancing production, characterized in that: The raw materials of the comprehensive grinding aid for enhancing production include: modified polycarboxylic acid compound, polyol, inorganic compound, surfactant and water.

2. The comprehensive grinding aid for enhancing production according to claim 1, characterized in that: The comprehensive grinding aid for enhancing production and improving production comprises, by weight, 5 to 10 parts of modified polycarboxylic acid compounds, 15 to 25 parts of polyols, 20 to 40 parts of inorganic compounds, 3 to 6 parts of surfactants, and 40 to 60 parts of water.

3. The comprehensive grinding aid for enhancing production according to claim 1, characterized in that: The modified polycarboxylic acid compound is prepared by reacting maleic anhydride, diethanol monoisopropanolamine, cinnamyl alcohol polyvinyl ether and acrylic acid.

4. The comprehensive grinding aid for enhancing production according to claim 2, characterized in that: The preparation method of the modified polycarboxylic acid compound comprises the following steps: S1: Add maleic anhydride to a reaction bottle, then slowly add diethanol monoisopropanolamine, start stirring, slowly heat to 60-80°C, react for 2-4 hours, and obtain an intermediate; S2: Take another reaction bottle, add deionized water, dissolve cinnamyl alcohol polyvinyl ether therein, then add acrylic acid and the intermediate prepared in step S1 in sequence, stir evenly, heat to 60-80° C., then slowly add initiator, and react for 4-6 hours; S3: After the reaction is completed, the pH value is adjusted to 7-8, and then filtered to obtain a modified polycarboxylic acid compound.

5. The comprehensive grinding aid for enhancing production according to claim 4, characterized in that: The mass ratio of the cinnamyl alcohol polyvinyl ether, acrylic acid and the intermediate prepared in step S1 is 3-5:2-3:

1.

6. The comprehensive grinding aid for enhancing production according to claim 4, characterized in that: The initiator is ammonium persulfate, and the amount of the initiator used is 1-3% of the total mass of cinnamyl alcohol polyvinyl ether, acrylic acid and the intermediate prepared in step S1.

7. The comprehensive grinding aid for enhancing production according to claim 4, characterized in that: The preparation method of the cinnamyl alcohol polyvinyl ether comprises the following steps: SS1: weigh cinnamyl alcohol and ethylene oxide and set aside; SS2: Add the cinnamyl alcohol weighed in step SS1 into a high-pressure reactor, then add potassium hydroxide, slowly stir, set the temperature to 120-150° C., and the pressure to 0.2-0.5 MPa; SS3: When the temperature reaches 120-150°C, slowly introduce the ethylene oxide weighed in step SS1 and react for 8-12 hours; SS4: After the reaction is completed, the mixture is cooled to room temperature, and the product is filtered and washed to obtain cinnamyl alcohol polyoxyethylene ether.

8. The comprehensive grinding aid for enhancing production according to claim 7, characterized in that: The mass ratio of the cinnamyl alcohol to ethylene oxide is 1:5-12.

9. The comprehensive grinding aid for enhancing production according to claim 1, characterized in that: The polyol is a mixture of one or more of ethylene glycol and propylene glycol; the inorganic compound is a mixture of one or more of sodium sulfate, sodium silicate and sodium chloride; the surfactant is a mixture of one or more of sodium dodecylbenzene sulfonate, lignin sulfonate and alkylnaphthalene sulfonate.

10. The method for preparing the comprehensive grinding aid for enhancing production according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Add an appropriate amount of water to a reaction vessel, slowly add the polyol, stirring at a speed of 200 to 500 rpm, to fully dissolve it in the water; Step 2: Add the inorganic compound and surfactant to step 1 and continue stirring for 30 to 60 minutes; Step 3: Finally, slowly add the modified polycarboxylic acid compound into step 2, stirring for 1 to 2 hours, to obtain the enhanced and yield-increasing comprehensive grinding aid.

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