Efficient cement grinding aid for reinforcement and preparation method thereof

Abstract

The invention relates to an efficient cement grinding aid for enhancement. The grinding aid is prepared from the following components in parts by mass: 20 to 40 parts of diethanolisopropanolamine, 5 to 15 parts of diethylene glycol, 15 to 25 parts of white sugar, 0.2 to 0.4 part of sodium sulfite, 5 to 10 parts of cement metal ion complexing agent and 10 to 60 parts of water. Meanwhile, the invention also discloses a preparation method of the cement grinding aid. The concrete reinforcing agent has an excellent reinforcing effect, the molecular polarity and adsorption capacity can be effectively reduced, and the competitive adsorption capacity with concrete admixtures such as a water reducing agent is weakened, so that the compatibility with the concrete admixtures is improved.

Description

Technical Field

[0001] The invention relates to the field of building material additives, and in particular to a high-efficiency cement grinding aid for reinforcement and a preparation method thereof. Background Art

[0002] The production process of cement requires a lot of energy consumption. Adding grinding aids is the best way for cement plants to save energy, reduce consumption and save costs. In 1824, the British Aspdin used a compound of water and coal to add to the grinding process to improve the efficiency of the mill. In the 1930s, the United Kingdom and the United States invented resin and lignin as grinding aids respectively.

[0003] At present, most cement grinding aids at home and abroad are mainly made of alcoholamines, such as triethanolamine and triisopropanolamine, which have good effects. At a reasonable dosage, they can reduce energy consumption by more than 20%, and have a certain early strength effect on the produced cement. However, alcoholamine grinding aids have poor performance stability and are very sensitive to changes in dosage. At the same time, their high price restricts their further application. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-efficiency cement grinding aid for strengthening which has excellent strengthening effect and stable adaptability.

[0005] Another technical problem to be solved by the present invention is to provide a method for preparing the enhanced high-efficiency cement grinding aid.

[0006] In order to solve the above problems, the present invention discloses an enhanced high-efficiency cement grinding aid, characterized in that the grinding aid is composed of the following components in parts by mass: 20 to 40 parts of diethanol monoisopropanolamine, 5 to 15 parts of diethylene glycol, 15 to 25 parts of white sugar, 0.2 to 0.4 parts of sodium sulfite, 5 to 10 parts of cement metal ion complexing agent, and 10 to 60 parts of water.

[0007] The method for preparing the enhanced high-efficiency cement grinding aid as described above comprises the following steps: ①Weigh according to the ratio; ② Pour water into the reactor, add sugar, and stir until dissolved to obtain mixed solution A; ③ Add diethanol monoisopropanolamine to the mixed solution A, and continue stirring at a rate of 100-160 r / min for 20-40 min to obtain a mixed solution B; ④ During the stirring process, the cement metal ion complexing agent is added to the mixed solution B, and the stirring is continued at a rate of 100-160 r / min for 40-60 min to obtain a mixed solution C; ⑤ Add sodium sulfite to mixed solution C, maintain the temperature at 22-38°C, stir at a stirring rate of 80-120 r / min for 1.5-2 h to obtain mixed solution D; ⑥ Add diethylene glycol to mixed liquid D and stir evenly.

[0008] Compared with the prior art, the present invention has the following advantages: 1. The present invention adds diethanol monoisopropanolamine and diethylene glycol, which can continuously release small molecular alcoholamine compounds in the cement hydration alkaline liquid slurry through catalysis of the complexing agent, thereby promoting the cement hydration rate at all ages and achieving better reinforcement effect.

[0009] 2. The present invention adopts cement metal ion complexing agent, which can completely replace triethanolamine, improve the limitations of triethanolamine, and solve the problems of low late strength growth rate, poor stability and large air entrainment of concrete by triethanolamine grinding aid.

[0010] 3. The present invention utilizes cement metal ion catalysis technology to increase the complexing agent of cement calcium, iron, and other metal ion complexing active functional groups, which can effectively act on various types of cement clinker, and therefore has stable adaptability.

[0011] 4. After adopting the present invention, since the cement metal ion complexing agent can be adsorbed on the surface of cement particles, the molecular polarity and adsorption capacity can be effectively reduced, and the competitive adsorption capacity with concrete admixtures such as water reducers is weakened, thereby improving the compatibility with concrete admixtures.

[0012] 5. After testing, the present invention has excellent reinforcing effect, increasing the three-day strength of cement by 3-6MPa and the 28-day strength by 5-8MPa. At the same time, it can increase the amount of cement admixture by 5%-15%, effectively reducing the comprehensive cost of cement. DETAILED DESCRIPTION

[0013] A high-efficiency cement grinding aid for enhancement, the grinding aid is composed of the following components in parts by mass (g): 20-40 parts of diethanol monoisopropanolamine, 5-15 parts of diethylene glycol, 15-25 parts of white sugar, 0.2-0.4 parts of sodium sulfite, 5-10 parts of cement metal ion complexing agent, and 10-60 parts of water.

[0014] The preparation method thereof comprises the following steps: ①Weigh according to the ratio; ② Pour water into the reactor, add sugar, and stir until dissolved to obtain mixed solution A; ③ Add diethanol monoisopropanolamine to the mixed solution A, and continue stirring at a rate of 100-160 r / min for 20-40 min to obtain a mixed solution B; ④ During the stirring process, the cement metal ion complexing agent is added to the mixed solution B, and the stirring is continued at a rate of 100-160 r / min for 40-60 min to obtain a mixed solution C; ⑤ Add sodium sulfite to mixed solution C, maintain the temperature at 22-38°C, stir at a stirring rate of 80-120 r / min for 1.5-2 h to obtain mixed solution D; ⑥ Add diethylene glycol to mixed liquid D and stir evenly.

[0015] Cement metal ion complexing agent is a complexing agent that uses cement metal ion catalysis technology to increase cement calcium, iron and other metal ion complexing active functional groups.

[0016] The materials used in the following examples 1 to 4 are described as follows: Diethanol monoisopropanolamine is 85% purity or above industrial grade, diethylene glycol is industrial grade, white sugar is industrial grade, sodium sulfite is industrial grade, all of which are commercially available products. The cement metal ion complexing agent is cement metal ion catalyst SWCD-06 purchased by Huizhou Sanhua New Technology Co., Ltd.

[0017] Example 1 A high-efficiency cement grinding aid for enhancement, the grinding aid is composed of the following components: 20 g of diethanol monoisopropanolamine, 5 g of diethylene glycol, 15 g of white sugar, 0.2 g of sodium sulfite, 5 g of cement metal ion complexing agent, and 54.8 g of water.

[0018] The preparation method thereof comprises the following steps: ①Weigh according to the ratio; ② Pour water into the reactor, add sugar, and stir until dissolved to obtain mixed solution A; ③ Add diethanol monoisopropanolamine to mixed solution A, and continue stirring at a rate of 100 r / min for 40 min to obtain mixed solution B; ④ During the stirring process, the cement metal ion complexing agent was added to the mixed solution B, and the mixture was stirred at a rate of 100 r / min for 40 min to obtain a mixed solution C; ⑤ Add sodium sulfite to mixed solution C, maintain the temperature at 25°C, stir at a stirring rate of 100 r / min for 2 h to obtain mixed solution D; ⑥ Add diethylene glycol to mixed liquid D and stir evenly.

[0019] Example 2 A high-efficiency cement grinding aid for enhancement, the grinding aid is composed of the following components: 25g diethanol monoisopropanolamine, 8g diethylene glycol, 18g white sugar, 0.3g sodium sulfite, 7g cement metal ion complexing agent, 41.7g water.

[0020] The preparation method thereof comprises the following steps: ①Weigh according to the ratio; ② Pour water into the reactor, add sugar, and stir until dissolved to obtain mixed solution A; ③ Add diethanol monoisopropanolamine to mixed solution A, and continue stirring at a rate of 120 r / min for 25 min to obtain mixed solution B; ④ During the stirring process, the cement metal ion complexing agent was added to the mixed solution B, and the stirring was continued at a rate of 100 r / min for 45 min to obtain a mixed solution C; ⑤ Add sodium sulfite to mixed solution C, maintain the temperature at 28°C, stir at a stirring rate of 100 r / min for 1.5 h to obtain mixed solution D; ⑥ Add diethylene glycol to mixed liquid D and stir evenly.

[0021] Example 3 A high-efficiency cement grinding aid for enhancement, the grinding aid is composed of the following components: 30 g of diethanol monoisopropanolamine, 10 g of diethylene glycol, 20 g of white sugar, 0.3 g of sodium sulfite, 8 g of cement metal ion complexing agent, and 31.7 g of water.

[0022] The preparation method thereof comprises the following steps: ①Weigh according to the ratio; ② Pour water into the reactor, add sugar, and stir until dissolved to obtain mixed solution A; ③ Add diethanol monoisopropanolamine to the mixed solution A and continue stirring at a rate of 130 r / min for 30 min to obtain a mixed solution B; ④ During the stirring process, the cement metal ion complexing agent was added to the mixed solution B, and the stirring was continued at a rate of 140 r / min for 60 min to obtain a mixed solution C; ⑤ Add sodium sulfite to mixed solution C, maintain the temperature at 30°C, and stir the mixture at a stirring rate of 120 r / min for 1.5 h to obtain mixed solution D; ⑥ Add diethylene glycol to mixed liquid D and stir evenly.

[0023] Example 4 A high-efficiency cement grinding aid for enhancement, the grinding aid is composed of the following components: 35g diethanol monoisopropanolamine, 10g diethylene glycol, 25g white sugar, 0.2g sodium sulfite, 7g cement metal ion complexing agent, and 22.8g water.

[0024] The preparation method thereof comprises the following steps: ①Weigh according to the ratio; ② Pour water into the reactor, add sugar, and stir until dissolved to obtain mixed solution A; ③ Add diethanol monoisopropanolamine to mixed solution A, and continue stirring at a rate of 125 r / min for 35 min to obtain mixed solution B; ④ During the stirring process, add the cement metal ion complexing agent into the mixed solution B and continue stirring at a rate of 140r / min for 50min; ⑤ Add sodium sulfite to mixed solution C, maintain the temperature at 35°C, stir at a stirring rate of 100 r / min for 1.5 h to obtain mixed solution D; ⑥ Add diethylene glycol to mixed liquid D and stir evenly.

[0025] The grinding aids obtained in Examples 1 to 4 were tested, and the results are shown in Table 1, which meet the requirements of GB / T 26748-2011 "Cement Grinding Aids" standard.

[0026] Table 1 Test results of the present invention In the production of PO42.5 cement in a cement enterprise, the grinding aids prepared in Examples 1 to 4 and the HF-01 grinding aid of Lanzhou Hongfang New Building Materials Technology Co., Ltd. were used as comparative examples. The amount of the grinding aid was 0.1%, and a blank test was performed without adding the grinding aid of the present invention. The results are shown in Table 2.

[0027] Table 2 Performance comparison table In summary, it can be seen from Table 1 that the various properties of the grinding aids obtained in Examples 1 to 4 meet the requirements of GB / T 26748-2011 "Cement Grinding Aids" standard. It can be seen from Table 2 that the grinding aids obtained in Examples 1 to 4 have excellent reinforcing effects, increasing the three-day strength of cement by 3 to 6 MPa and the 28-day strength by 5 to 8 MPa. Among them, the grinding aid obtained in Example 3 has the largest increase in 3d compressive strength and 28d compressive strength. At the same time, the grinding aids obtained in Examples 1 to 4 effectively increase the amount of admixture added in cement, and effectively reduce the cost of cement.

Claims

1. A high-efficiency cement grinding aid for enhancement, characterized in that: The grinding aid is composed of the following components in parts by mass: 20-40 parts of diethanol monoisopropanolamine, 5-15 parts of diethylene glycol, 15-25 parts of white sugar, 0.2-0.4 parts of sodium sulfite, 5-10 parts of cement metal ion complexing agent, and 10-60 parts of water.

2. A method for preparing an enhanced high-efficiency cement grinding aid as claimed in claim 1, comprising the following steps: ①Weigh according to the ratio; ② Pour water into the reactor, add sugar, and stir until dissolved to obtain mixed solution A; ③ Add diethanol monoisopropanolamine to the mixed solution A, and continue stirring at a rate of 100-160 r / min for 20-40 min to obtain a mixed solution B; ④ During the stirring process, the cement metal ion complexing agent is added to the mixed solution B, and the stirring is continued at a rate of 100-160 r / min for 40-60 min to obtain a mixed solution C; ⑤ Add sodium sulfite to mixed solution C, maintain the temperature at 22-38°C, stir at a stirring rate of 80-120 r / min for 1.5-2 h to obtain mixed solution D; ⑥ Add diethylene glycol to mixed liquid D and stir evenly.

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