Method for continuously producing high-efficiency concrete grinding aid

Abstract

The invention provides a method for realizing simple and direct preparing of high-efficiency cement rubber additive. The method, which has lower cost and takes ammonia, propylene oxide (PO) and ethylene oxide (EO) as raw materials, comprises the following steps that: superfluous ammonia stream and PO stream are fed into a continuous reactor so as to continuously form a mixture containing isopropanolamine, diisopropanolamine and triisopropanolamine; liquid level inside the continuous reactor is maintained to ensure that the stream in the reactor undergoes outer circulation spraying through a circulating pump from the bottom to the top of the continuous reactor, and part of the stream is continuously fed into a flash tower so as to remove unreacted ammonia; then, the stream with ammonia removed is reacted with EO stream so as to continuously generate products. The method ensures that products do not need rectification separation and greatly reduce production energy consumption, thereby reducing the production cost of products.

Description

1. Technical field [0001] The invention relates to a method for preparing high-efficiency cement grinding aids, in particular to a method for continuously preparing high-efficiency cement grinding aids, belonging to the field of organic synthesis. 2. Background technology [0002] Cement grinding aids are additives added in the cement grinding process, which play a very important role in the cement grinding process. It can produce mechanical performance through physical and chemical effects, speed up the grinding speed of materials, avoid particle agglomeration, improve cement grinding fineness and cement strength; it can also reduce grinding power consumption and improve grinding efficiency. There are many varieties of cement grinding aids, among which triethanolamine and / or triisopropanolamine are the raw materials of cement grinding aids, and the reports are the most. The outstanding feature of triethanolamine (hereinafter referred to as TEA) is that it can increase the ...

AI Technical Summary

Problems solved by technology

The outstanding feature of triethanolamine (hereinafter referred to as TEA) is that it can increase the 1-day compressive strength of cement, but it does not contribute to the strength of 28 days and beyond; Or later, the strength has a higher growth, but the early strength of the cement within 1 day or 7 days cannot be increased

The production of high-efficiency cement grinding aids is usually directly compounded by purchasing TEA, TIPA, DEIPA and other active raw materials, and the production cost is high

The production of these active raw materials requires a complex purification process, which is not only time-consuming and labor-intensive, but also causes adverse effects on the environment.

[0003] The method of directly and continuously preparing high-efficiency cement grinding aids by reacting ammonia and epoxides as raw materials has not been reported at home and abroad.

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