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Cement grinding aid

A technology of cement grinding aids and chain transfer agents, which is applied in the field of cement grinding aids, can solve the problems of unstable quality and large dosage of grinding aids, and achieve the effects of increased strength, low dosage and increased specific surface area

Inactive Publication Date: 2014-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cement grinding aid with synthetic high molecular polymer as the main component, to solve the problems of unstable quality and large dosage of existing grinding aids

Method used

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  • Cement grinding aid

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Comparison scheme
Effect test

Embodiment 1

[0027] A cement grinding aid, comprising the following components, by mass percentage:

[0028] High molecular polymer: 56%

[0029] p-Sulfuran: 4%

[0030] Propylene Glycol: 6%

[0031] Ammonium nitrate: 2%

[0032] Water: 32%

[0033] The preparation process of this cement grinding aid is as follows:

[0034] While stirring, add p-sulfanilic acid, propylene glycol, and ammonium nitrate to the water in sequence until they are completely dissolved, then add the high molecular polymer, and stir until they are completely dissolved.

[0035] The preparation method of macromolecular polymer is as follows, by mass percentage:

[0036] Take 71.2% acetone in a four-necked flask, then add 0.5% azobisisobutyronitrile and 0.3% n-dodecanethiol respectively, start stirring, heat up to 60°C and reflux, add 2% styrene, 20 % allyl ether (n=25), 6% ethyl acrylate monomer; control the temperature at 60±1°C and react for 3.5 hours. After the reaction is complete, the temperature is contr...

Embodiment 2

[0038] A cement grinding aid, comprising the following components, by mass percentage:

[0039] High molecular polymer: 50%

[0040] p-Sulfuran: 3%

[0041] Propylene Glycol: 10%

[0042] Ammonium nitrate: 4%

[0043] Water: 33%

[0044] The preparation process of this cement grinding aid is as follows:

[0045] While stirring, add p-sulfanilic acid, propylene glycol, and ammonium nitrate to the water in sequence until they are completely dissolved, then add the high molecular polymer, and stir until they are completely dissolved.

[0046] The preparation method of macromolecular polymer is as follows, by mass percentage:

[0047] Take 69.1% acetone in a four-neck flask, then add 0.6% azobisisobutyronitrile and 0.3% n-dodecanethiol respectively, start stirring, raise the temperature to 58°C and reflux, add 2% styrene, 22% Allyl ether (n=28), 6% ethyl acrylate monomer; control temperature at 59±1°C, react for 4 hours. After the reaction is complete, the temperature is co...

Embodiment 3

[0049] A cement grinding aid, comprising the following components, by mass percentage:

[0050] High molecular polymer: 60%

[0051] p-Sulfuran: 5%

[0052] Propylene Glycol: 5%

[0053] Ammonium nitrate: 1%

[0054] Water: 29%

[0055] The preparation process of this cement grinding aid is as follows:

[0056] While stirring, add p-sulfanilic acid, propylene glycol, and ammonium nitrate to the water in sequence until they are completely dissolved, then add the high molecular polymer, and stir until they are completely dissolved.

[0057] The preparation method of macromolecular polymer is as follows, by mass percentage:

[0058] Take 69% acetone in a four-neck flask, then add 0.8% azobisisobutyronitrile and 0.2% n-dodecanethiol respectively, start stirring, raise the temperature to 58°C and reflux, add 2.2% styrene, 23.8% Allyl ether (n=28), 4% ethyl acrylate monomer; control temperature at 58±1°C, react for 5 hours. After the reaction is complete, the temperature is c...

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Abstract

The invention discloses a liquid cement grinding aid. The cement grinding aid is prepared by dissolving components in water. The cement grinding aid comprises the following components by mass percent: 50-60% of macromolecular polymer, 1-5% of sulfanilic acid, 5-10% of propylene glycol, 1-5% of ammonium nitrate and the balance of water. The macromolecular polymer is formed by taking acetone as a solvent, carrying out free radical polymerization on a polymerization monomer, an initiator and a chain transfer agent and then carrying out reduced pressure distillation. The cement grinding aid has an obvious grinding assisting effect, yield of a mill is effectively increased, specific surface area of cement is increased, grain composition of the cement can also be improved, and cement strength can be improved.

Description

technical field [0001] The invention relates to the field of cement production, in particular to a cement grinding aid. Background technique [0002] Cement grinding is a process with high energy consumption and low efficiency, in which more than 75% of the energy is wasted. Therefore, energy conservation, emission reduction, and the development of a low-carbon economy are urgent issues for the cement industry to solve. In order to reduce energy consumption and improve grinding efficiency, people usually take the following two measures: first, improve the grinding equipment and grinding process to maximize the use of mechanical energy; second, add cement grinding aids in the cement grinding process to improve grinding efficiency. The second measure is the current research focus in the field of cement production. In Europe, America, Japan and other developed countries, the use of grinding aids has become quite common, but we are still at the initial stage. The reason is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B103/52
Inventor 高建明张太龙谢雪
Owner SOUTHEAST UNIV