Low-chloride and low-alkali composite cement grinding aid and preparation method thereof

Abstract

The invention discloses a low-chloride and low-alkali composite cement grinding aid and a preparation method thereof. The low-chloride and low-alkali composite cement grinding aid is prepared from, by weight, 2-6 parts of hydroxypropyl methyl cellulose, 0.2-0.6 part of sodium chloride, 2-4 parts of sodium hexametaphosphate, 2-4 parts of magnesium dihydrogen phosphate, 2-4 parts of ammonium sulfate, 0.8-1.8 parts of sodium thiosulfate, 2-4 parts of sodium formate, 2-4 parts of sodium acetate, 2-4 parts of aluminum sulfate, 0.8-1.8 parts of sodium thiocyanate, 2-4 parts of sodium metasilicate pentahydrate, 2-6 parts of sodium lignin sulfonate, 2-4 parts of molasses, 2-4 parts of calcium lignosulphonate, 2-6 parts of triisopropanolamine, 2-4 parts of glycerin, 1.2-1.8 parts of pentaerythritol, 5-7 parts of p-aminobenzene sulfonic acid, 2-4 parts of methacrylic acid, 2-4 parts of maleic anhydride, 0.8-1.2 parts of polysorbate, 0.8-1.8 parts of active silica, 4-8 parts of kieselguhr, 2-4 parts of teflon powder, 5-12 parts of pulverized fuel ash and 70-120 parts of water.

Description

technical field [0001] The invention belongs to the technical field of cement production, and relates to a low-chloride, low-alkali and low-cost low-chloride and low-alkali composite cement grinding aid and a preparation method thereof. Background technique [0002] In the grinding process of cement clinker, the addition of a small amount of cement grinding aid can not only significantly improve the grinding efficiency, but also improve the performance of cement. However, the simultaneous introduction of chloride ions and alkali in cement has brought disadvantages that cannot be ignored. Chloride ions can cause corrosion of steel bars in bridge steel-concrete structures, and steel bar corrosion is an important factor affecting the durability of bridge steel-concrete structures. Excessively high alkalinity will shorten the setting time of cement, increase water demand, and may even cause alkali-aggregate reaction with concrete aggregate, thereby destroying the concrete struc...

AI Technical Summary

Problems solved by technology

However, the production cost of existing similar low-chlorine and low-alkali composite cement grinding aids is relatively high, which greatly restricts the popularization of industrialization.

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