Cement grinding aid, preparation method thereof and cement
A cement grinding aid and cement technology, which is applied in the field of cement manufacturing, can solve the problems of wide distribution of cement particles, limited grinding force, and rough products, and achieve a high electric charge capacity, excellent grinding effect, and high compressive strength. Effect
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preparation example 1
[0034] A kind of modified diethanolamine, its preparation method is as follows:
[0035] 1) In 17g of DMF, add 4.5g of diethanolamine and maleic anhydride with the same molar amount as diethanolamine, and stir and react for 4h at 25°C to obtain mixed solution A;
[0036] 2) Under nitrogen atmosphere, add 3g of methacrylic acid to the mixed solution A, after stirring, add 0.12g of initiator, which is azobisisobutyronitrile, heat to 75℃, stir for 22h, and then add 8g Sodium hydroxide solution with a concentration of 5 mol / L, rotary evaporation to obtain modified diethanolamine.
preparation example 2
[0038] A modified diethanolamine is different from Preparation Example 2 in that the initiator is an equal amount of azobisisoheptanenitrile, and the remaining steps are the same as those in Preparation Example 1.
Embodiment 1-3
[0041] A kind of cement grinding aid of embodiment 1-3, its each raw material is as shown in table 1, and its preparation step is as follows:
[0042] Add modified diethanolamine, sodium lignosulfonate and surfactant in water, stir until dissolved, then add triethanolamine and glycerol, stir until dissolved to obtain cement grinding aid.
[0043] Wherein, the modified diethanolamine is from Preparation Example 1; the surfactant is sodium dodecylbenzenesulfonate.
[0044] Table 1 Each raw material and the amount of each raw material (kg) of Examples 1-3
[0045] Example 1 Example 2 Example 3 Modified Diethanolamine 40 45 50 Surfactant 0.5 1 2 Triethanolamine 9 5 1 Glycerol 1 4 9 Sodium lignosulfonate 5 3 2 water 120 130 140
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