Preparation method of hydrophobic nano-aerogel composite material

A technology of nano-airgel and composite materials, which is applied in the field of preparation of hydrophobic nano-airgel composite materials, which can solve the problems of high production cost, low utilization rate of hydrophobic modifier, loss of raw materials, etc., and achieve a smooth transition to the immersion environment , to avoid the loss of silica, the effect of controllable gel time

Active Publication Date: 2015-07-22
河北金纳低碳材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, the technical problem to be solved by the present invention is that in the preparation process of the hydrophobic nano-airgel composite material in the prior art, the raw material loss is serious, the utilization rate of the hydrophobic modifier is low,

Method used

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  • Preparation method of hydrophobic nano-aerogel composite material
  • Preparation method of hydrophobic nano-aerogel composite material
  • Preparation method of hydrophobic nano-aerogel composite material

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Embodiment 1

[0036] The preparation method of the hydrophobic nano airgel composite material of the present embodiment, such as figure 1 Shown is the process flow, which specifically includes the following steps:

[0037] 1) Take 100g of sodium water glass with a modulus of 2.0, mix it with water at a weight ratio of 1:3, and then slowly add it to the H + Concentration is in the 0.1L nitric acid solution of 8mol / L, and adding speed is 900ml / min, and stirring speed is 300 rev / min, and the pH value of adjusting mixed solution is 4.0;

[0038] 2) Add 100 g of glass fibers to the mixed solution obtained in step 1), disperse it evenly, and then let it stand for 10 minutes to obtain a hydrogel, and continue to stand and age the hydrogel for 48 hours to obtain an aged water gel. gel;

[0039] 3) soaking the aged hydrogel obtained in step 2) with deionized water for 4 times, each time for 5 hours; to obtain a wet gel with impurities removed;

[0040] 4) Soak the impurity-removing wet gel obtain...

Embodiment 2

[0045] The preparation method of the hydrophobic nano airgel composite material of the present embodiment specifically comprises the following steps:

[0046] 1) Take 100g of potassium water glass with a modulus of 3.3, mix it with water in a weight ratio of 1:6, and then add it to the H + Concentration is in the 0.12L nitric acid solution of 6mol / L, and adding speed is 600ml / min, and stirring speed is 400 rev / min, and the pH value of adjusting mixed solution is 4.5;

[0047] 2) Add 100 g of rock wool to the mixed solution obtained in step 1), disperse it evenly, and then let it stand for 180 minutes to obtain a hydrogel, and continue to stand and age the hydrogel for 6 hours to obtain an aged water gel. gel;

[0048] 3) Soak the aged hydrogel obtained in step 2) twice with deionized water for 5 hours each time; obtain a wet gel with impurities removed;

[0049] 4) soak the impurity-removing wet gel obtained in step 3) in isopropanol with a mass fraction of 50% for 2 hours, ...

Embodiment 3

[0053] The preparation method of the hydrophobic nano airgel composite material of the present embodiment specifically comprises the following steps:

[0054] 1) Take 100g of sodium water glass with a modulus of 2.6, mix it with water at a weight ratio of 1:5, and then add it to the H + In the 0.1L phosphoric acid solution with a concentration of 12mol / L, the addition speed is 1200ml / min, the stirring speed is 500 rpm, and the pH value of the mixed solution is adjusted to 5.5;

[0055] 2) Add 100 g of high-silica fiber to the mixed solution obtained in step 1), disperse it evenly, and then let it stand for 95 minutes to obtain a hydrogel, and continue to stand and age the hydrogel for 27 hours to obtain the aged the hydrogel;

[0056] 3) soaking the aged hydrogel obtained in step 2) with deionized water for 5 times, each time for 5 hours; to obtain a wet gel with impurities removed;

[0057] 4) Soak the impurity-removing wet gel obtained in step 3) in 40% ethanol for 2 hours...

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Abstract

The invention provides a preparation method of a hydrophobic nano-aerogel composite material. The preparation method comprises the following steps of mixing, aging, impurity removing, solvation, drying and hydrophobic modification. By the preparation method, the yield can be relatively high, the utilization rate of raw materials is higher, the cost is reduced, filtration and precipitation are not required, and the process is simpler; the hydrophobic nano-aerogel composite material prepared according to the preparation method can achieve a better hydrophobic effect, is uniform in microstructure, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of composite materials, and in particular relates to a preparation method of hydrophobic nano airgel composite materials. Background technique [0002] Airgel, also known as "dry gel" and "solid smoke", is the lightest solid in the world in the Guinness Book of World Records, and was first produced by American scientist Sterven.S.Kistler in 1931. However, due to the limitations of scientific research methods, the technological level of drying equipment, and the level of the chemical industry at that time, the research on airgel has not been valued by the scientific community. With the enrichment of scientific research methods, the development and improvement of supercritical drying equipment technology and the rapid development of the chemical industry, in the 1990s, airgel once again entered the sight of scientists, competing to become a scientific research hotspot in universities and research institut...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 左炜王鹏高燕燕杜世明
Owner 河北金纳低碳材料有限公司
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