Hydrophobic fiber felt reinforced titanium-silicon composite airgel and preparation method thereof

A composite aerogel and composite gel technology are applied in the field of hydrophobic fiber felt reinforced titanium-silicon composite aerogel and its preparation. The effect of obvious effect, low production cost and long service life

Active Publication Date: 2018-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, due to SiO 2 Airgel itself has low mechanical strength and low density, and it is easy to drop powder

Method used

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  • Hydrophobic fiber felt reinforced titanium-silicon composite airgel and preparation method thereof
  • Hydrophobic fiber felt reinforced titanium-silicon composite airgel and preparation method thereof
  • Hydrophobic fiber felt reinforced titanium-silicon composite airgel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix tetraethyl orthosilicate, absolute ethanol, deionized water, and 0.5mol / L hydrochloric acid uniformly in a volume ratio of 1:3.5:0.32:0.015. The mixing steps are:

[0035] (1) Mix tetraethyl orthosilicate with 2 / 3 of the volume of absolute ethanol, and stir to obtain solution A;

[0036] (2) Mix the remaining absolute ethanol with deionized water and HCl, and stir to obtain solution B;

[0037] (3) Slowly add solution B into solution A.

[0038] React at 50°C for 1h, under stirring, press SiO 2 :TiO 2 (Mass ratio) = 1:0.05 Add rutile titanium dioxide to SiO 2 In the sol, add 1mol / LNH 3 ·H 2 O to adjust the pH value of the solution to 6 and keep stirring to obtain TiO 2 -SiO 2 Composite sol;

[0039] TiO 2 -SiO 2 Pour the composite sol into the mold of the basalt fiber felt prefabricated part, wait for the sol to soak into the basalt fiber felt, pour out the excess sol, and leave the sol composite material at 50°C for 1 hour to form a gel composite material...

Embodiment 2

[0042] Tetraethyl orthosilicate, absolute ethanol, deionized water, and 0.8mol / L hydrochloric acid were uniformly mixed in a volume ratio of 1:4:0.32:0.015, and the mixing steps were the same as in Example 1.

[0043]React at 55°C for 1.2h, under stirring, press SiO 2 :TiO 2 (Mass ratio) = 1:0.07 Add anatase titanium dioxide to SiO 2 Sol, add 1.3mol / LNH 3 ·H 2 O to adjust the pH value of the solution to 6.3 and keep stirring to obtain TiO 2 -SiO 2 Composite sol;

[0044] TiO 2 -SiO 2 Pour the composite sol into the mold of the glass fiber mat prefabricated part, wait for the sol to soak into the glass fiber mat, pour out the excess sol, and leave the sol composite material at 60°C for 1.5h to form a gel composite material; the obtained gel The composite was subjected to solvent replacement with absolute ethanol solution at 60 °C for 2.5 days, and the surface modification of the gel composite was performed with trimethylchlorosilane for 2.5 days to obtain a hydrophobic ...

Embodiment 3

[0047] Tetraethyl orthosilicate, absolute ethanol, deionized water, and 1mol / L nitric acid were uniformly mixed in a volume ratio of 1:4.5:0.32:0.015, and the mixing steps were the same as in Example 1.

[0048] React at 65°C for 1.5h, under stirring, press SiO 2 :TiO 2 (Mass ratio) = 1:0.1 Add rutile titanium dioxide to SiO 2 Sol, add 1.6mol / LNH 3 ·H 2 O adjusted the pH value of the solution to 6.6, and kept stirring to obtain TiO 2 -SiO 2 Composite sol;

[0049] TiO 2 -SiO 2 Pour the composite sol into the mold of the mullite fiber felt prefab, wait for the sol to soak through the mullite fiber felt, pour out the excess sol, and leave the sol composite material at 65°C for 2.5h to form a gel composite material; The obtained gel composite was subjected to solvent replacement with absolute ethanol solution at 70 °C for 3 days, and the surface of the gel composite was modified with trimethylchlorosilane for 3 days to obtain a hydrophobic surface, and then used without ...

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Abstract

The invention discloses hydrophobic fibrofelt enhanced titanium and silicon compound aerogel and a preparation method, and belongs to the technical field of preparation of nano-structure materials. The aerogel is prepared from tetraethoxysilane, absolute ethyl alcohol, deionized water, acid, titanium dioxide and alkali. In preparation, firstly, tetraethoxysilane and 2 / 3 of the total volume of absolute ethyl alcohol are evenly mixed and stirred to obtain a solution A; then, remaining absolute ethyl alcohol, deionized water and acid are mixed and evenly stirred to obtain a solution B; then, the solution B is slowly added to the solution A, and it is avoided that floc appears at the addition position and influences the stability and hydrophobic effect. The hydrophobic effect is remarkable, the hydrophobicity is 92.4% on the 7th day, the prepared hydrophobic fibrofelt enhanced titanium and silicon compound aerogel has certain strength, can be folded, can be used for the fields of national defense, aerospace, military affairs, oil production engineering and the like and is low in carbon emission, environmentally friendly and long in service life.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanostructure materials, and in particular relates to a hydrophobic fiber felt-reinforced titanium-silicon composite airgel and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, various thermal insulation materials are constantly being introduced. Modern thermal insulation materials have been widely used in petroleum, chemical, smelting, power sector equipment pipelines, as well as industrial and civil buildings because of their good thermal insulation and energy-saving properties. But at the same time, it also puts forward higher requirements for high-temperature thermal insulation systems, not only requiring high thermal efficiency, improving the utilization rate of effective heat, reducing waste heat output, and a series of high-temperature resistance, light weight, high efficiency, and high stability. Performance; at the sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
Inventor 沈静翟勇赵晓红栾智勇戴宇婷王超赵晓贺文媛郝婷婷何旭刘廷峰梁伟王志敏
Owner CHINA PETROLEUM & CHEM CORP
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