Preparation method for cement auxiliary-grinding strengthener of polyethylene glycol amine ester carboxylic acid system

Abstract

The invention belongs to the technical field of cement auxiliary-grinding agents, and in particular to a preparation method for a cement auxiliary-grinding strengthener of a polyethylene glycol amine ester carboxylic acid system. The preparation method comprises the following steps: (1) performing esterification reaction on alcohol amines and unsaturated carboxylate in a molar mass ratio to obtain esterification monomers which contain polar groups, such as hydroxyl and carboxyl; (2) adding unsaturated large monomers and water into a reaction container, stirring, heating and dissolving, respectively adding an initiator, the esterification monomers and a chain transfer agent dropwise, preserving the heat after the reaction is performed for a certain period of time, and adjusting the pH of a solution to be neutral after the reaction is completed so as to prepare the cement auxiliary-grinding strengthener of the polyethylene glycol amine ester carboxylic acid system. The cement auxiliary-grinding strengthener fully plays the action mechanism of the polar functional groups, such as the hydroxyl and the carboxyl, on cement; when the using amount is 0.01 to 0.1 percent of the mass of the cement, the yield each grinding machine per hour is improved by 12 to 25 percent, the 3-day strength of the cement can be increased by 2 to 5 MPa, the 28-day strength of the cement can be increased by 4 to 8 MPa, and the aims of stable performance and remarkable effects of auxiliary grinding and strengthening are fulfilled.

Description

technical field [0001] The invention relates to a preparation method of a polyol urethane carboxylic acid cement grinding aid enhancer, which is suitable for cement manufacturers to improve cement grinding effect and cement performance. Background technique [0002] In the cement industry, the energy consumed by the mill grinding process accounts for more than 2 / 3 of the total energy consumption of the entire cement production. Therefore, in order to improve the grinding efficiency of the mill, reduce the unit energy consumption, and improve the quality of cement, cement grinding process additives, namely cement grinding aids, are used in the cement grinding process, which greatly reduces the grinding time and energy consumption. At present, cement grinding aids are usually prepared from alkanols or alcohol amines (such as glycerol, ethylene glycol, triethanolamine, triisopropanolamine, etc.) as raw materials through simple compounding. Today, such grinding aids can no long...

AI Technical Summary

Problems solved by technology

However, polyolamine carboxylic acid cement grinding aids with polar functional groups such as hydroxyl and carboxyl, which are synthesized by grafting unsaturated macromonomers through alcohol amine esterification, have not yet been reported.

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