Modified cement grinding auxiliary agent and preparation method thereof

A cement grinding aid and modification technology, which is applied in the field of modified cement grinding aid and its preparation, can solve the problems of not being suitable for the actual production process of cement, the high price of triethanolamine, and the increase of cement production cost, etc. Hourly output, shortening of coagulation time, and reduction of energy consumption

Inactive Publication Date: 2019-09-10
NANJING YONGNENG MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But according to its fixed structure, it also has its own disadvantages
[0004] Triethanolamine is a relatively strong polar alcohol amine. It is a non-ionic alcohol amine surfactant containing amine groups and polymers. It is alkaline in aqueous solution and can interact with metals in cement. The interaction between ions and minerals has been used in the early strength agent of concrete a long time ago, but it has been found through experiments that it can increase the early strength of cement, and the strength will decrease in the later stage
When used in cement early strength agent, the compound use of triethanolamine and polyol can play a positive superimposed effect on the effect of cement to a large extent, and it is an internationally recognized high-efficiency early strength agent. Adding an amount of about 0.03% in the process of using it can increase the output of cement by about 20%. The effect is very obvious, but the price of triethanolamine is also very expensive, so in the cement production process. The cost has also increased a lot
Therefore, it is not suitable for the actual production process of cement

Method used

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  • Modified cement grinding auxiliary agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] A modified cement grinding aid, its raw materials are composed of: phosphoric acid-glycerol modified triethanolamine 7%, activator 0.5%, polyol 15%, molasses 3%, sodium thiosulfate 7%, sodium sulfate 3% , sodium acetate 2%, the balance is water, the total amount is 100%;

[0023] Its preparation of described phosphoric acid-glycerol modified triethanolamine comprises the following steps:

[0024] Reaction with triethanolamine, glycerol and phosphoric acid with a molar ratio of 1:1:1: add triethanolamine (31.1g, 0.21mol), glycerol (43g, 0.21mol) and phosphoric acid (19.95g, 0.21mol) into a 250ml three-neck round bottom flask ) stirring, adding catalyst before heating up, adding catalyst concentrated sulfuric acid (1% of the total mass of the reactant) and slowly adding dropwise, heating to 120° C., after 3 hours of reaction, cooling down to obtain triethanolamine phosphate glycerol modified product.

[0025] The percentages are all percentages by mass. According to the ...

Embodiment 2

[0027] A modified cement grinding aid, the raw materials of which consist of: phosphoric acid-glycerin modified triethanolamine 15%, activator 0.8%, polyol 34%, molasses 10%, sodium thiosulfate 15%, sodium sulfate 5% , sodium acetate 8%, the balance is water, the total amount is 100%;

[0028] Its preparation of described phosphoric acid-glycerol modified triethanolamine comprises the following steps:

[0029] Reaction with triethanolamine, glycerol and phosphoric acid with a molar ratio of 1:1:1: add triethanolamine (31.1g, 0.21mol), glycerol (43g, 0.21mol) and phosphoric acid (19.95g, 0.21mol) into a 250ml three-neck round bottom flask ) stirring, add the catalyst before heating up, add the catalyst concentrated sulfuric acid (3% of the total mass of the reactant) slowly dropwise, heat to 140°C, after 6h of reaction, cool down to obtain triethanolamine phosphate glycerol modified product.

[0030] The percentages are all percentages by mass. According to the proportion of t...

Embodiment 3

[0032] A modified cement grinding aid, its raw materials are composed of: phosphoric acid-glycerin modified triethanolamine 12%, activator 0.5%, polyol 17%, molasses 3%, sodium thiosulfate 9%, sodium sulfate 4% , sodium acetate 6%, the balance is water, the total amount is 100%;

[0033] Its preparation of described phosphoric acid-glycerol modified triethanolamine comprises the following steps:

[0034] Reaction with triethanolamine, glycerol and phosphoric acid with a molar ratio of 1:1:1: add triethanolamine (31.1g, 0.21mol), glycerol (43g, 0.21mol) and phosphoric acid (19.95g, 0.21mol) into a 250ml three-neck round bottom flask ) stirring, add the catalyst before heating up, add the catalyst concentrated sulfuric acid (2% of the total mass of the reactants) slowly dropwise, heat to 130° C., after 5 hours of reaction, cool down to obtain triethanolamine phosphate glycerol modified product.

[0035] The percentages are all percentages by mass. According to the proportion of...

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Abstract

The invention discloses a modified cement grinding auxiliary agent and a preparation method thereof. The cement grinding auxiliary agent is prepared from the following raw materials in percentages bymass: 7 to 15% of phosphoric acid-glycerin modified triethanolamine, 0.5 to 0.8% of an activator, 15 to 34% of polyol, 3 to 10% of molasses, 7 to 15% of sodium thiosulfate, 3 to 5% of anhydrous sodiumsulphate and 2 to 8% of sodium acetate, with the balance being water, wherein the total amount of the raw materials is 100%. According to the invention, through using of the phosphoric acid-glycerinmodified triethanolamine and addition of the activator according to demands, the grinding auxiliary agent provided by the invention has good chemical stability, is free of halogen ions with corrosionto equipment, significantly improves the grinding efficiency, early strength and later strength of cement, and can significantly reduce energy consumption of cement production by 20 to 30% through participation of the phosphoric acid-glycerin modified triethanolamine.

Description

technical field [0001] The invention belongs to the technical field of cement production, in particular to a modified cement grinding aid and a preparation method thereof. Background technique [0002] Cement grinding aid is a process admixture added during cement grinding. The addition of grinding aid can improve the cement grinding process and increase production efficiency without compromising cement performance. The purpose is to reduce production costs and improve cement quality. The use of grinding aids can improve the strength, water demand, setting time, fluidity and other quality indicators of cement as well as the applicability of cement. The earliest appearance of grinding aids was mainly based on the ball milling process, with the theoretical starting point of how to disperse material particles. Therefore, traditional grinding aids are mainly suitable for ball milling processes. They are based on the theory of dispersing material particles. The complex chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/52
CPCC04B40/0039C04B2103/52C04B24/122C04B22/165C04B24/026C04B24/001C04B22/14C04B22/147C04B24/04C04B24/26C04B24/383
Inventor 李晓静谢昊刘国华
Owner NANJING YONGNENG MATERIALS
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