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Modified alkali lignin cement grinding aid and preparation method thereof

A technology of cement grinding aid and alkali lignin, applied in the field of cement grinding aid, can solve problems such as poor grinding aid enhancement ability, and achieve the effects of improved strength, simple production process and low production cost

Inactive Publication Date: 2012-08-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to develop a high-performance alkali lignin-based cement grinding aid and its preparation method for the shortcomings of the existing lignosulfonate cement grinding aids that have poor grinding aid and strengthening ability

Method used

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  • Modified alkali lignin cement grinding aid and preparation method thereof
  • Modified alkali lignin cement grinding aid and preparation method thereof
  • Modified alkali lignin cement grinding aid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 200 grams of alkaline pulping straw pulp black liquor acid analysis alkali lignin (weight percentage, solid content: 95%) and mix it with 400 grams of water, add sodium hydroxide to adjust the pH to 10.5, then heat to 60°C and stir to dissolve fully , adding 10 g of diethylene glycol monobutyl ether, and performing an activation reaction at 70° C. for 1.5 hours to obtain a reaction solution. Dissolve 10 grams of ammonium persulfate in 60 grams of water, slowly add it dropwise to the reaction solution at 60° C. within 30 minutes, and then carry out oxidation reaction at 80° C. for 2 hours. Then 20 g of glycerol was added and reacted at 85° C. for 1 hour. Cool to room temperature after the reaction to obtain a modified alkali lignin cement grinding aid liquid product.

Embodiment 2

[0033] Take 200 grams of alkali lignin alkaline pulping straw pulp black liquor acid analysis alkali lignin (weight percentage, solid content: 95%), mix it with 433 grams of water, add sodium hydroxide to adjust the pH to 10, and then heat to 70 ° C Stir to dissolve fully, add 15 g of n-octanol, and perform an activation reaction at 80° C. for 1 hour to obtain a reaction solution. Dissolve 30 grams of 50% hydrogen peroxide in 120 grams of water, slowly add it dropwise to the reaction solution at 70°C within 45 minutes, and then carry out oxidation reaction at 70°C for 3 hours. Then add 30 g of diethylene glycol, and react at 70° C. for 2 hours. Cool to room temperature after the reaction to obtain a modified alkali lignin cement grinding aid liquid product.

Embodiment 3

[0035]Take 200 grams of alkali lignin alkaline pulping straw pulp black liquor acid analysis alkali lignin (weight percentage, solid content: 95%), mix it with 560 grams of water, add sodium hydroxide to adjust the pH to 11, and then heat to 80 °C Stir to dissolve fully, add 20 g of n-decyl alcohol, and carry out activation reaction at 90° C. for 1.5 hours to obtain a reaction solution. Dissolve 20 grams of sodium perborate in 80 grams of water, slowly add it dropwise to the reaction solution at 80° C. within 60 minutes, and then carry out oxidation reaction at 90° C. for 4 hours. Then add 30 g of sodium gluconate and 10 g of dipropylene glycol mixture, and react at 90° C. for 1.5 hours. Cool to room temperature after the reaction to obtain a modified alkali lignin cement grinding aid liquid product.

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Abstract

The invention discloses a modified alkali lignin cement grinding aid and a preparation method thereof. According to mass portions, the formula of the cement grinding aid includes the following ingredients: 200 portions of alkali lignin, 10-20 portions of oxidant, 10-20 portions of activating agent, and 20-50 portions of polar additive, wherein the alkali lignin is bamboo pulp or straw pulp papermaking black liquor alkali lignin treated by acidification, and the mass percentage of solid content in the alkali lignin is 95%. In the preparation method, the alkali lignin is taken as a main raw material, and the oxidant, the activating agent and the polar additive are added, thus obtaining the efficient alkali lignin cement grinding aid through activation and oxidation reactions. The product with low additive amount of 0.1% has good grinding aid and enhancing capabilities on cement clinker and admixture, and has less influence on the setting time of cement. The comprehensive performance of the modified alkali lignin cement grinding aid is far better than that of a traditional alkali lignin sulfonate grinding aid, and is comparable to the efficiency of a triethanolamine grinding aid. Theproduct is wide in raw material sources, low in prices of raw materials, simple in process and low in production cost, thus being a novel green efficient cement grinding aid.

Description

technical field [0001] The invention relates to cement grinding aids, in particular to a method for preparing cement grinding aids through acid analysis and oxidation modification of alkali lignin from straw pulp papermaking black liquor. Specifically, a modified alkali lignin high-efficiency cement grinding aid is prepared by using straw pulp and papermaking black liquor as a raw material through acid analysis of alkali lignin, which is activated and oxidized under normal pressure. Background technique [0002] Cement grinding aid is a chemical additive that improves the grinding effect and performance of cement. It is used in the grinding process of cement materials. Adding a small amount of grinding aid can significantly improve the grinding efficiency or reduce energy consumption, and significantly improve the cement table. hourly output and various technical indicators without compromising the performance of the cement itself. As a chemical activator, the grinding aid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/52
Inventor 邱学青周明松杨东杰楼宏铭邓永红易聪华
Owner SOUTH CHINA UNIV OF TECH
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