Preparation method of modified silicon powder

A technology of modifying silicon and silicon powder, which is applied in the field of preparation of construction materials, can solve the problems of poor dispersion and easy aggregation of silicon powder, and achieve the effects of easy separation, increased flexural strength, and solution to agglomeration

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

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Problems solved by technology

Silica fume is used in high-performance concrete, but silica fume is easy to agglomerate and cannot be well dispersed in concrete. This is the problem facing the current use of silica fume

Method used

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  • Preparation method of modified silicon powder
  • Preparation method of modified silicon powder
  • Preparation method of modified silicon powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Add silicon powder to absolute ethanol, ultrasonically disperse for 30 minutes and then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, then add distilled water, ultrasonically disperse for 15 minutes and then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, after vacuum drying Get pretreated silicon powder. The purpose of pretreatment is to remove impurities, activate and disperse the particles of silicon powder evenly.

[0021] 2. Slowly pour the pretreated silicon powder into a sodium hydroxide solution with a mass concentration of 20%, while continuously stirring and reacting for 24 hours, filter under reduced pressure, wash with distilled water until the pH is 8-9 to obtain alkali-treated silicon powder; The treated silicon powder was poured into a sulfuric acid solution with a mass concentration of 10%, stirred continuously for 4 hours, filtered under reduced pressure, washed with distilled water until neutral, and vacuum-dr...

Embodiment 2

[0025] 1. Add silicon powder to absolute ethanol, ultrasonically disperse for 30 minutes and then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, then add distilled water, ultrasonically disperse for 15 minutes and then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, after vacuum drying Get pretreated silicon powder. The purpose of pretreatment is to remove impurities, activate and disperse the particles of silicon powder evenly.

[0026]2. Slowly pour the pretreated silicon powder into a sodium hydroxide solution with a mass concentration of 20%, while continuously stirring and reacting for 24 hours, filter under reduced pressure, wash with distilled water until the pH is 8-9 to obtain alkali-treated silicon powder; The treated silicon powder was poured into a sulfuric acid solution with a mass concentration of 10%, stirred continuously for 4 hours, filtered under reduced pressure, washed with distilled water until neutral, and vacuum-dri...

Embodiment 3

[0030] 1. Add silicon powder to absolute ethanol, ultrasonically disperse for 30 minutes and then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, then add distilled water, ultrasonically disperse for 15 minutes and then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, after vacuum drying Get pretreated silicon powder. The purpose of pretreatment is to remove impurities, activate and disperse the particles of silicon powder evenly.

[0031] 2. Slowly pour the pretreated silicon powder into a sodium hydroxide solution with a mass concentration of 20%, while continuously stirring and reacting for 24 hours, filter under reduced pressure, wash with distilled water until the pH is 8-9 to obtain alkali-treated silicon powder; The treated silicon powder was poured into a sulfuric acid solution with a mass concentration of 10%, stirred continuously for 4 hours, filtered under reduced pressure, washed with distilled water until neutral, and vacuum-dr...

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PUM

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Abstract

The invention discloses a preparation method of modified silicon powder. The preparation method comprises the following steps of: firstly, performing hydroxylation treatment on the surface of silicon powder to obtain hydroxylated silicon powder; then modifying the hydroxylated silicon powder by using a coupling agent to obtain coupling agent modified silicon powder; and finally, performing graft polymerization on the coupling agent modified silicon powder and acrylamide through a graft polymerization reaction to obtain polyacrylamide grafted silicon powder (modified silicon powder). According to the modified silicon powder, the acrylamide is grafted on the surface of the silicon powder, so that the tenacity of a cement-based composite material is improved, the dosages of water and cement of the composite material are reduced, and the rupture strength is obviously improved and can completely meet requirements for the rupture strength of a high-performance cement-based composite material; and because the modified silicon powder has surface hydrophilic groups, the modified silicon powder has good dispersity, and the problem of agglomeration of a mineral admixture can be well solved. The preparation method is low in reaction temperature, mild in condition, simple in after-treatment and low in industrialization cost.

Description

1. Technical field [0001] The invention relates to a method for preparing building materials, in particular to a method for preparing modified silicon powder, which is to modify the silicon powder by grafting polyacrylamide. 2. Background technology [0002] Silica fume is a common inorganic particle in construction admixtures. The physical and chemical properties of silica fume are suitable for use as concrete admixtures. Because of its high purity, stable performance, very small particles, and fast hydration speed, the reinforcement effect is good. It has the advantages of early strength effect and easy control of the quality of the mixed concrete. The very low content of harmful components in silica fume has almost no effect on the performance of concrete, and has excellent corrosion resistance, so when used as an admixture, the durability of concrete is greatly improved. Silica fume has a good plasticizing effect and can be single-mixed or mixed-mixed in concrete to imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/02
Inventor 王文平江腾飞唐家元赵牧原
Owner HEFEI UNIV OF TECH
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