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...

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Problems solved by technology

[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 dosage of liquid is 0.03-0.1%, and the liquid cement grinding aid still has deficiencies such as stratification and settlement, resulting in large fluctuations in product performance, which affects the performance of grinding aid enhancement; at the same time, with the price of petroleum and other chemical raw materials The price of triethanolamine is also rising, which seriously restricts the promotion and application of cement grinding aids

The paper only discloses the grinding aid performance when the molar ratio of triethanolamine to maleic anhydride in the synthesis of triethanolamine maleate is 1:1.1, and the excellent modification effect of triethanolamine maleate has not been excavated

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