Method for preparing polyether modified polycarboxylic acid grinding aid

Abstract

The invention discloses a method for preparing a polyether modified polycarboxylic acid grinding aid. The method is characterized by comprising the following steps: preparing solutions from methyl allyl alcohol polyoxyethylene ether, crylic acid and vinyl acetate in a mole ratio of (1-5):(1-4):(0.1-0.3), and an initiator which accounts for 0.5-1.6% of the total mass and a chain transferring agent which accounts for 0.1-0.5 of the total mass; feeding the methyl allyl alcohol polyoxyethylene ether solution and the chain transferring agent into a reactor, mixing crylic acid and vinyl acetate, putting the mixture into a first constant-pressure liquid dropping device, and putting the initiator solution into a second constant-pressure liquid dropping device; and starting the constant-pressure liquid dropping device at 40-60 DEG C, completely dropping the liquid within 55-65 minutes, stirring to react for 30 minutes at 55-60 DEG C, heating to 85-90 DEG C to react for 10-30 minutes, cooling, and adjusting the pH value to be 7-8, thereby obtaining the polyether modified polycarboxylic acid grinding aid. The polyether modified polycarboxylic acid grinding aid is good in grinding aid and water reduction effect when used for producing universal silicate cement.

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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