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Preparation method of cationic surfactant modified fly ash

A technology of surfactant and fly ash, which is applied in the field of preparation of modified fly ash, can solve the problems of reducing hydration heat, and the effect of bending resistance is not very good, and achieves changes in adsorption performance, low cost of industrialization, Handling simple effects

Inactive Publication Date: 2013-09-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash has the advantages of reducing water consumption, saving cement consumption, improving the workability of concrete mixtures, reducing heat of hydration, thermal expansion, etc., but the effect is not very good in terms of flexural performance

Method used

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  • Preparation method of cationic surfactant modified fly ash
  • Preparation method of cationic surfactant modified fly ash
  • Preparation method of cationic surfactant modified fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Add water to 100g of fly ash and disperse evenly. After centrifugation, wash 3 times with absolute ethanol and dry, then add NaOH solution with a mass concentration of 30%, and reflux at 80°C for 24 hours. After the reaction, use a mass concentration of 10 % sulfuric acid solution to adjust the pH value to neutral, washed three times with absolute ethanol and vacuum dried to obtain the pretreated fly ash.

[0032] 2. Under ice-water bath conditions, slowly add 4ml of 20wt% hydrogen peroxide solution to 6ml of 98wt% sulfuric acid solution to obtain a mixed solution, while stirring while adding, then slowly add 10g of pretreated fly ash into the In the mixed solution, stir and react for 10 minutes, place it still until the gas generated is completely diffused and the mixed solution is cooled, then wash with double distilled water, dry under nitrogen protection to obtain hydroxylated fly ash.

[0033] 3. Add 2g of hydroxylated fly ash, 10mL of toluene, 2ml of KH-570 and...

Embodiment 2

[0036] 1. Add water to 100g of fly ash and disperse evenly. After centrifugation, wash 3 times with absolute ethanol and dry, then add NaOH solution with a mass concentration of 30%, and reflux at 80°C for 24 hours. After the reaction, use a mass concentration of 10 % sulfuric acid solution to adjust the pH value to neutral, washed three times with absolute ethanol and vacuum dried to obtain the pretreated fly ash.

[0037] 2. Under ice-water bath conditions, slowly add 8ml of 20wt% hydrogen peroxide solution to 12ml of 98wt% sulfuric acid solution to obtain a mixed solution, while stirring while adding, then slowly add 20g of pretreated fly ash into the In the mixed solution, stir and react for 10 minutes, place it still until the gas generated is completely diffused and the mixed solution is cooled, then wash with double distilled water, dry under nitrogen protection to obtain hydroxylated fly ash.

[0038] 3. Add 4g of hydroxylated fly ash, 20mL of toluene, 4ml of KH-570 an...

Embodiment 3

[0041] 1. Add water to 100g of fly ash and disperse evenly. After centrifugation, wash 3 times with absolute ethanol and dry, then add NaOH solution with a mass concentration of 30%, and reflux at 80°C for 24 hours. After the reaction, use a mass concentration of 10 % sulfuric acid solution to adjust the pH value to neutral, washed three times with absolute ethanol and vacuum dried to obtain the pretreated fly ash.

[0042] 2. Under ice-water bath conditions, slowly add 12ml of 20wt% hydrogen peroxide solution into 18ml of 98wt% sulfuric acid solution to obtain a mixed solution, while stirring while adding, then slowly add 30g of pretreated fly ash into the In the mixed solution, stir and react for 10 minutes, place it still until the gas generated is completely diffused and the mixed solution is cooled, then wash with double distilled water, dry under nitrogen protection to obtain hydroxylated fly ash.

[0043] 3. Add 6g of hydroxylated fly ash, 30mL of toluene, 3ml of KH-570...

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Abstract

The invention discloses a preparation method of cationic surfactant modified fly ash, which comprises the following steps of: firstly performing pretreatment and hydroxylation treatment on the surface of fly ash to obtain hydroxylated fly ash to obtain a grafting point; then modifying the fly ash by use of a coupling agent; and finally performing grafting reaction with a cationic surfactant polyacrylamide to obtain cationic surfactant modified fly ash. According to the preparation method disclosed by the invention, the polyacrylamide is grafted on the surface of the fly ash, and the adsorption property of the grafted fly ash is greatly changed; particularly the fly ash is applied to a cement-based composite material, and the fracture resistance of the cement-based composite material is obviously improved; and the preparation method disclosed by the invention has the advantages of low reaction temperature, mild conditions, simple after-treatment and low industrialization cost.

Description

1. Technical field [0001] The invention relates to a preparation method of modified fly ash, in particular to a preparation method of cationic surfactant modified fly ash. 2. Background technology [0002] Fly ash is the fine ash collected from the flue gas after pulverized coal combustion, and it is an industrial waste discharged from coal-fired power plants. With the advantages of wide range of sources and low production price, the utilization of fly ash in my country has developed vigorously. It has developed from passive stacking and simple treatment to large-scale application in the fields of building materials, construction engineering, municipal administration, transportation, and agricultural environmental protection. Gradually expand to new fields such as light industry, chemical industry, metallurgy, and coal. At present, the research of organic-inorganic composite materials has made great progress, and is widely used in optics, electricity, magnetism, biology and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/00
Inventor 王文平张志强唐家元陈伟
Owner HEFEI UNIV OF TECH
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