A kind of preparation method of polyether modified polycarboxylate grinding aid

Abstract

The invention discloses a preparation method of a polyether-modified polycarboxylic acid grinding aid, which is characterized in that the ratio of methallyl alcohol polyoxyethylene ether: acrylic acid: vinyl acetate is 1-5: 1-4: Take 0.1-0.3 molar ratio, take the total mass of 0.5-1.6% initiator and 0.1-0.5% chain transfer agent and make an aqueous solution; put the methallyl alcohol polyoxyethylene ether aqueous solution and the chain transfer agent into the reactor In the process, acrylic acid and vinyl acetate are mixed and then placed in the first constant pressure dropping device, and the initiator aqueous solution is placed in the second constant pressure dropping device; at a temperature of 40-60°C, the dropping device is turned on, at 55 After ~65 minutes of dripping, stir and react at 55~60°C for 30 minutes; heat up to 85~90°C and react for 10~30 minutes, cool down, and adjust the pH to 7~8, that is, the polyether modified polycarboxylic acid grinding aid is prepared. It is suitable for the production of general-purpose Portland cement, and has good grinding and water-reducing effects.

Description

technical field [0001] The invention belongs to the preparation of cement admixtures, and relates to a preparation method of a polyether-modified polycarboxylate grinding aid, in particular to a method for preparing a polycarboxylate grinding aid by modifying methallyl alcohol polyoxyethylene ether method, the prepared grinding aid is suitable for producing general-purpose Portland cement and has good grinding aiding effect. Background technique [0002] Cement production is a process of high energy consumption. The annual total power consumption of my country's cement industry exceeds 100 billion kW / h, which consumes more than 5% of the country's total power generation. The power consumption of the clinker grinding process accounts for 40% of the total power consumption of the cement production line. , of which the effective utilization rate of energy is less than 5%. The grinding process of clinker is the breaking process of valence bonds, especially the breaking of Ca-O a...

AI Technical Summary

Problems solved by technology

[0002] Cement production is a process of high energy consumption. The annual total power consumption of my country's cement industry exceeds 100 billion kW / h, which consumes more than 5% of the country's total power generation. The power consumption of the clinker grinding process accounts for 40% of the total power consumption of the cement production line. , of which the effective utilization rate of energy is less than 5%

However, its product composition is complicated, the preparation cycle is long, and the cost of raw materials is high, so it is difficult to carry out industrialization

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