Cement grinding aid and preparing method thereof

A cement grinding aid and lignin technology, applied in the field of cement additives and its preparation, can solve the problems of high alkali content, layered settlement, excessive chloride ion content, etc., achieve good wear resistance and compression resistance, and have a wide range of raw materials , the effect of low preparation cost

Inactive Publication Date: 2012-06-13
GUIZHOU CHUZHI BUILDING MATERIAL SCI & TECH
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Problems solved by technology

[0004] At present, one of the main raw materials of cement grinding aids is alkanolamine, which accounts for about 80% of the total formulation of cement grinding aids. In order to reduce costs, some cement grinding aids companies add a large amount of industrial salt, etc., resulting in commercially available compounding. Cement grinding aids have deficiencies such as industrial salt, excessive chloride ion content, high alkali content, and layered settlement, which lead to large fluctuations in product performance and affect the performance of grinding aid enhancement; at the same time, with the continuous rise in the price of petrochemical raw materials , the price of alkanolamines is also rising, which seriously restricts the promotion and application of cement grinding aids

Method used

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  • Cement grinding aid and preparing method thereof
  • Cement grinding aid and preparing method thereof
  • Cement grinding aid and preparing method thereof

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preparation example Construction

[0055] The present invention also provides a preparation method of modified lignin, comprising:

[0056] mixing lignin and alcohol amine compounds in water to obtain a mixed solution, and adjusting the mixed solution to be alkaline;

[0057] Drop formaldehyde into the mixed solution to react to obtain modified lignin;

[0058] The mass ratio of the lignin, alcohol amine compounds, formaldehyde and water is: (10-15); (10-15): (24-30): (40-50).

[0059] According to the present invention, the preparation of the modified lignin is specifically:

[0060] First, add a certain amount of lignin and water in a reaction kettle equipped with stirring, temperature control, feeding and condensing reflux devices, and adjust the mixed solution to be alkaline with sodium hydroxide, and the alkaline meets the following conditions: pH 9~10, then add diethanolamine into the reaction kettle, raise the temperature to 90~120°C, and finally add formaldehyde solution dropwise slowly into the react...

Embodiment 1

[0070] In the four-neck flask equipped with mechanical stirring, thermometer, feeding funnel, and reflux condenser, add 250kg of lignin and 950kg of water, adjust the pH to 9 to 10 with 10kg of sodium hydroxide, then add 220kg of diethanolamine, and heat up to 95°C, then slowly add 480kg of formaldehyde solution dropwise within 2 hours, react for 5 hours under stirring, and end the reaction to obtain the modified lignin polymer synthetic cement grinding aid.

Embodiment 2

[0072] In the four-neck flask equipped with mechanical stirring, thermometer, feeding funnel, and reflux condenser, add 275kg of lignin and 1000kg of water, adjust the pH to 9-10 with 15kg of caustic soda, then add 250kg of diethanolamine, and heat up to 105°C, then slowly add 510kg of formaldehyde solution dropwise within 2 hours, react with stirring for 6 hours, and end the reaction to obtain the modified lignin polymer synthetic cement grinding aid.

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Abstract

The invention provides a modified lignin, which is prepared by methanal, alcamines compound and lignin. Mass ratio of the lignin, the alcamines compound and the methanal which form a repetitive unit and are in the modified lignin is (10-15):(10-15):(24-30). A cement grinding aid comprising the modified lignin is further provided. The cement grinding aid comprising the modified lignin is low in preparing cost, small in adding amount and excellent in grinding aiding performance. A preparing method for the modified lignin and a preparing method for the cement grinding aid comprising the modifiedlignin are further provided.

Description

technical field [0001] The invention relates to the field of cement additives and preparation thereof, in particular to a cement grinding aid and a preparation method thereof. Background technique [0002] Cement grinding aids, also known as cement process admixtures, are chemical substances that are added during the cement grinding process to aid in grinding, strengthen and improve the performance of cement. The state stipulates that the amount added should not exceed 0.5% of the cement mass. The cement production process can be summarized as two grindings and one burning, that is, raw material grinding, calcining and cement grinding. The energy consumption of the clinker grinding process accounts for 60% of the total energy consumption, and the energy utilization rate is low, and about 97% of the consumed energy is converted into heat energy and wasted. This is due to the mutual collision, extrusion, and friction of the clinker in the grinding body. The large amount of st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/52
Inventor 李因文赵洪义朱化雨朱孔赞余辉
Owner GUIZHOU CHUZHI BUILDING MATERIAL SCI & TECH
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