Polycarboxylic cement grinding aid and preparation method thereof

Abstract

The invention relates to a polycarboxylic cement grinding aid and a preparation method thereof. The polycarboxylic cement grinding aid comprises isopentenol polyoxyethylene ether, acrylic acid, methacrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, sodium methylacrylsulfonate, sodium allysulfonate, hydrogen peroxide, ammonium persulfate, L-ascorbic acid, sodium formaldehyde sulfoxylate dihydrate, mercaptoacetic acid, mercaptopropionic acid, sodium hydroxide and water. The preparation method comprises the following steps: adding isopentenol polyoxyethylene ether, hydrogen peroxide, ammonium persulfate, sodium methylacrylsulfonate, sodium allysulfonate and water to a reaction kettle; processing acrylic acid, methacrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and water to prepare a solution A, and processing L-ascorbic acid, sodium formaldehyde sulfoxylate dihydrate, mercaptoacetic acid, mercaptopropionic acid and water to obtain a solution B; and heating the reaction kettle to 30DEG C, adding the solution A and the solution B in a dropwise manner, and carrying out a polymerization reaction to obtain the final product. The molecular structure of the polycarboxylic cement grinding aid synthesized in the invention contains various functional groups, so the grinding efficiency is effectively improved, energy consumed in the grinding process is reduced, the early strength and the later strength of cement are improved, and the compatibility of cement and a concrete additive is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a polycarboxylate cement grinding aid and a preparation method thereof. Background technique [0002] Cement grinding aid is a chemical additive that improves the grinding effect and performance of cement. It can significantly increase the output of cement table, the strength of cement of all ages, and improve its fluidity. Cement grinding aids can greatly reduce the phenomenon of electrostatic adsorption and ball formation during the grinding process, and can reduce the tendency of re-agglomeration of ultrafine particles formed during the grinding process. Cement grinding aids can also significantly improve the fluidity of cement, improve the grinding effect of the mill and the powder selection efficiency of the powder separator, thereby reducing the energy consumption of grinding. Cement produced with grinding aids has a lower tendency to compact and agg...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects existing in the existing small molecule cement grinding aid products, improve the stability of the grinding aid product, improve the cement grinding efficiency and the cement strengthening effect, and the production process has the advantages of energy saving, consumption reduction, environmental protection , Simplify the process, improve efficiency and a series of advantages, have a certain market competitiveness, and are conducive to large-scale production and application

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