Cement grinding aid

Abstract

The invention relates to the technical field of cement additives, in particular to a cement grinding aid. The cement grinding aid comprises the following raw materials in parts by weight: 100 parts of triethanolamine and 60-90 parts of maleic anhydride or maleic acid. In the cement grinding aid, the maleic anhydride or maleic acid is preferably 75-85 parts by weight. The cement grinding aid is prepared by adopting the following steps of: adding the triethanolamine into a reactor, and adjusting the pH value to be neutral by using acetic acid or propionic acid; adding the maleic anhydride or maleic acid, stirring and heating to 60-105 DEG C, reacting for 2-5h, cooling to room temperature, and regulating the pH value to be neutral by using a sodium hydroxide solution. The cement grinding aid has the advantages of uniformity and stability, no layering after long-term standing, low alkali content, no chloride ions, low doping amount only accounting for 0.01-0.03 percent of the cement amount, simple formula design, simplified production steps, good grinding aid effect and excellent reinforcement effect, can promote the energy-saving and emission-reduction effects of the cement industry and can completely meet market requirements.

Description

technical field

[0001] The invention relates to the technical field of cement admixtures, in particular to a cement grinding aid. Background technique

[0002] Cement grinding aid, also known as cement process admixture, is an admixture added during cement grinding to aid in grinding without damaging the performance of cement. The amount added should not exceed 1% of the cement mass. During the cement grinding process, 95% of the energy is consumed as heat energy. At the same time, with the increase of cement grinding fineness, the aggregation of fine particles will lead to a sharp decline in grinding efficiency. One of the best ways to improve the above situation is to grind Add cement grinding aids.

[0003] Triethanolamine is one of the main raw materials of cement grinding aids, accounting for about 70% of the total amount of grinding aids. Currently, the commercially available compound cement grinding aids have a large amount, and the amount of powder is 0.5-1%. The d...

Examples

Embodiment 1

[0028] Add 100kg triethanolamine to the reactor, then add 40kg acetic acid, adjust the solution to neutral, then add 60kg maleic anhydride, stir and heat up to 60°C, react for 5h, cool to room temperature, and then use 500kg 20% ​​sodium hydroxide Adjust the pH of the solution to neutral to obtain the cement grinding aid.

Embodiment 2

[0030] Add 100kg of triethanolamine to the reactor, then add 40kg of acetic acid, adjust the solution to neutral, then add 70kg of maleic anhydride, stir and heat up to 80°C, react for 4.5h, cool to room temperature, and then use 535kg of 20% hydrogen to oxidize Sodium solution adjusts pH to neutral to obtain cement grinding aid.

Embodiment 3

[0032] Add 100kg triethanolamine to the reactor, then add 40kg acetic acid, adjust the solution to neutral, then add 75kg maleic acid, stir and heat up to 85°C, react for 4h, cool to room temperature, and then use 550kg 20% ​​sodium hydroxide Adjust the pH of the solution to neutral to obtain the cement grinding aid.

technical field

[0001] The invention relates to the technical field of cement admixtures, in particular to a cement grinding aid. Background technique

[0002] Cement grinding aid, also known as cement process admixture, is an admixture added during cement grinding to aid in grinding without damaging the performance of cement. The amount added should not exceed 1% of the cement mass. During the cement grinding process, 95% of the energy is consumed as heat energy. At the same time, with the increase of cement grinding fineness, the aggregation of fine particles will lead to a sharp decline in grinding efficiency. One of the best ways to improve the above situation is to grind Add cement grinding aids.

[0003] Triethanolamine is one of the main raw materials of cement grinding aids, accounting for about 70% of the total amount of grinding aids. Currently, the commercially available compound cement grinding aids have a large amount, and the amount of powder is 0.5-1%. The d...

Examples

Embodiment 1

[0028] Add 100kg triethanolamine to the reactor, then add 40kg acetic acid, adjust the solution to neutral, then add 60kg maleic anhydride, stir and heat up to 60°C, react for 5h, cool to room temperature, and then use 500kg 20% ​​sodium hydroxide Adjust the pH of the solution to neutral to obtain the cement grinding aid.

Embodiment 2

[0030] Add 100kg of triethanolamine to the reactor, then add 40kg of acetic acid, adjust the solution to neutral, then add 70kg of maleic anhydride, stir and heat up to 80°C, react for 4.5h, cool to room temperature, and then use 535kg of 20% hydrogen to oxidize Sodium solution adjusts pH to neutral to obtain cement grinding aid.

Embodiment 3

[0032] Add 100kg triethanolamine to the reactor, then add 40kg acetic acid, adjust the solution to neutral, then add 75kg maleic acid, stir and heat up to 85°C, react for 4h, cool to room temperature, and then use 550kg 20% ​​sodium hydroxide Adjust the pH of the solution to neutral to obtain the cement grinding aid.

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