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Surface modification method for high-dispersion nanometer silicon dioxide

A nano-silica, surface modification technology, applied in chemical instruments and methods, dyed high molecular organic compound treatment, dyed low molecular organic compound treatment and other directions, can solve the problem that the enhancement effect is not fully exerted and is well dispersed effect, reduce concrete performance and other issues, to achieve the effect of improving agglomeration, good dispersion, and improving mechanical properties and durability.

Inactive Publication Date: 2020-02-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is directly added to the cement-based powder material, it will obviously not get a good dispersion effect, its reinforcing effect will not be fully exerted, and it may even become a defect and reduce the performance of concrete.

Method used

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  • Surface modification method for high-dispersion nanometer silicon dioxide

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] A surface modification method of highly dispersed nano-silicon dioxide, the method comprises the following steps:

[0026] 1) The nano-silica is prepared into a nano-silica suspension with ethanol as a solvent whose mass fraction is 10%, and the prepared suspension is ultrasonically dispersed in an ultrasonic cleaner with a frequency of 40KHz for 15min;

[0027] 2) the pH value of pH meter test suspension after ultrasonic finishes, and adopting dilute hydrochloric acid to adjust the pH of suspension is 4;

[0028] 3) silane coupling agent KH550 is added in the suspension after adjusting pH (wherein the add-on of silane coupling agent KH550 is the suspension quality 10% after adjusting pH), and is put into constant temperature magnetic water bath heating stirrer to stir 8h, the control temperature is 65°C, and the stirring speed is 300 rpm to obtain a mixed solution;

[0029] 4) The mixed solution was filtered 3 times with a suction filter and washed with alcohol, and t...

Embodiment 2

[0034] A surface modification method of highly dispersed nano-silicon dioxide, the method comprises the following steps:

[0035] 1) The nano-silica is prepared into a nano-silica suspension with a mass fraction of 10% using ethanol as a solvent, and the prepared suspension is ultrasonically dispersed in an ultrasonic cleaner with a frequency of 30KHz for 10min;

[0036] 2) the pH value of pH meter test suspension after ultrasonic finishes, and adopting dilute hydrochloric acid to adjust the pH of suspension is 4;

[0037] 3) silane coupling agent KH550 is added in the suspension after adjusting pH (wherein the add-on of silane coupling agent KH550 is the suspension quality 10% after adjusting pH), and is put into constant temperature magnetic water bath heating stirrer to stir 5h, the control temperature is 50°C, and the stirring speed is 300 rpm to obtain a mixed solution;

[0038] 4) The mixed solution was filtered 3 times with a suction filter and washed with alcohol, and...

Embodiment 3

[0041] A surface modification method of highly dispersed nano-silicon dioxide, the method comprises the following steps:

[0042] 1) The nano-silicon dioxide is prepared into a nano-silica suspension with a mass fraction of 15% using ethanol as a solvent, and the prepared suspension is ultrasonically dispersed in an ultrasonic cleaner with a frequency of 35KHz for 15min;

[0043] 2) the pH value of pH meter test suspension after ultrasonic finishes, and adopting dilute hydrochloric acid to adjust the pH of suspension is 4.5;

[0044] 3) silane coupling agent KH560 is added in the suspension after adjusting pH (wherein the add-on of silane coupling agent KH560 is the suspension mass 20% after adjusting pH), and is put into constant temperature magnetic water bath heating stirrer to stir 8h, the control temperature is 70°C, and the stirring speed is 400 rpm to obtain a mixed solution;

[0045] 4) The mixed solution was suction filtered 3 times with a suction filter and washed w...

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Abstract

The invention relates to a surface modification method for high-dispersion nanometer silicon dioxide. The surface modification method comprises the following steps: 1) preparing a nanometer silicon dioxide suspension with ethanol as a solvent from a certain amount of nanometer silicon dioxide, and ultrasonically dispersing the prepared suspension in an ultrasonic cleaner; 2) testing the pH value of the suspension after the ultrasonic treatment is finished, and adjusting the pH value of the suspension to 4-5 by adopting acid; 3) adding a certain amount of a silane coupling agent into the pH-value-adjusted suspension, carrying out heating in a water bath and performing uniform stirring to obtain a mixed solution; and 4) carrying out suction filtration on the mixed solution, carrying out washing with alcohol, and drying the obtained solid substance in a vacuum constant-temperature drying oven to obtain the modified nanometer silicon dioxide powder. The method is simple in process, easy tooperate, low in cost and friendly to environment; and the obtained modified nanometer silicon dioxide is good in dispersity and stability, overcomes he problem that the nanometer silicon dioxide is prone to agglomeration, and has huge application potential in the aspect of performance regulation and control of high-performance concrete.

Description

technical field [0001] The invention relates to a surface modification method of highly dispersed nano-silica, belonging to the technical field of nano-material modification. Background technique [0002] The difference between nanomaterials and conventional materials is not only the difference in scale, but also the change in physical and chemical energy. Nanomaterials have the characteristics of small particle size, large specific surface area, high surface energy and large proportion of surface atoms, and The unique properties of mechanics, optics, magnetism, electricity, etc. make it not only widely studied and applied as a new functional material, but also its interdisciplinary research with other research fields has also received more and more attention. [0003] Because the calcium silicate hydrate gel in the cement hardening slurry has a nanostructure, 70% of the cement hardening slurry is nano-scale calcium silicate hydrate gel particles. In addition, there are nano...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/08C09C3/10C09C3/04
CPCC09C1/28C09C3/006C09C3/04C09C3/08C09C3/10
Inventor 戎志丹张佳奇
Owner SOUTHEAST UNIV
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