Method for preparing silica aerogel by doped brucite fiber and titanium dioxide powder

A technology of brucite fiber and titanium dioxide is applied in the field of preparing silicon aerogel doped with brucite fiber and titanium dioxide powder. The effect of coefficients

Inactive Publication Date: 2010-02-24
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to some defects of single silica airgel, such as: poor toughness, relatively brittle, low strength, brittle, and infrared t

Method used

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  • Method for preparing silica aerogel by doped brucite fiber and titanium dioxide powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Measure 3.8ml of distilled water into beaker B, weigh 0.0398g of sodium dodecylsulfonate and add it into beaker B, stir until it dissolves, then add 0.2655g of brucite fiber, stir for 30 minutes, then ultrasonically oscillate for 10 minutes Measure 4ml distilled water in beaker A, add 15ml industrial silica sol with constant stirring, then measure 3ml glycerol and join in beaker A, add 1.8g titanium dioxide powder, then add dropwise 30ml absolute ethanol; When the ethanol is about to be added dropwise, add the fibers in beaker B to beaker A, stir evenly and let the gel stand; age for 2 days, in order to prevent cracking, pour absolute ethanol into beaker A to protect the gel and wrap it with a plastic wrap Seal the beaker A; age at 45°C with an aging solution with a volume ratio of water: absolute ethanol of 1:5 for two days, and change the aging solution once in the middle; gently pour the aged gel into a larger beaker, and use Soak in water and ethanol for 6 days, rep...

Embodiment 2

[0017] Measure 4.0ml of distilled water into beaker B, weigh 0.0637g of sodium dodecylsulfonate into beaker B, stir until it dissolves, then add 0.4250g of brucite fiber, stir for 20 minutes, and then ultrasonically oscillate for 13 minutes ; Measure 4.5ml of distilled water in beaker A, add 10ml of industrial silica sol with continuous stirring, then measure 1ml of glycerin and add it to beaker A, add 1.2g of titanium dioxide powder, and then add 29ml of absolute ethanol dropwise; in beaker A When the ethanol is about to be added dropwise, add the fibers in beaker B to beaker A, stir evenly and let the gel stand; aging for 3 days, in order to prevent cracking, pour absolute ethanol into beaker A to protect the gel and use fresh-keeping Membrane-sealed beaker A; aged at 30°C with an aging solution with a volume ratio of water: absolute ethanol of 1:4 for two days, changing the aging solution once in the middle; gently pour the aged gel into a beaker with a larger size, Soak in...

Embodiment 3

[0019] Measure 2.8ml of distilled water into beaker B, weigh 0.0387g of sodium lauryl sulfate into beaker B, stir until it dissolves, then add 0.2732g of brucite fiber, stir for 25 minutes, and then ultrasonically oscillate for 10 minutes; Measure 2.5ml of distilled water into beaker A, add 13ml of industrial silica sol with continuous stirring, then measure 2ml of glycerol and add it to beaker A, add 0.8g of titanium dioxide powder, and then add dropwise 27.5ml of absolute ethanol; in beaker A When the ethanol is about to be added dropwise, add the fibers in beaker B to beaker A, stir evenly and let the gel stand; aging for 2 days, in order to prevent cracking, pour absolute ethanol into beaker A to protect the gel and use fresh-keeping Membrane-sealed beaker A; aged at 40°C with an aging solution with a volume ratio of water: absolute ethanol of 1:4.5 for two days, and replaced the aging solution once in the middle; gently pour the aged gel into a larger beaker, and use Soak...

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Abstract

The invention provides a method for preparing silica aerogel by doped brucite fiber and titanium dioxide powder. The raw materials are available and non-toxic, the doped brucite fiber is used for enhancing the strength of the aerogel, brucite fiber is the only one environmentally friendly fiber which is not cancerogenic at present, fusing point thereof is as high as 1960 DEG C, and the brucite fiber can resist higher temperature compared with glass fiber and the like; the titanium dioxide powder is added, so that the defect of high temperature infrared transparence is avoided and heat conductivity at high temperature can be reduced; and supercritical technology is adopted to prepare aerogel composite material block without crack, the density thereof is 0.13-0.3g/cm<3>, heat conductivity at900K can be reduced to 0.045W.m<-1>.K<-1>, and breaking strength can reach 1.08MPa.

Description

technical field [0001] The invention belongs to the field of super heat insulating materials, and in particular relates to a method for preparing silica airgel doped with brucite fiber and titanium dioxide powder. Background technique [0002] Airgel is a highly dispersed solid material in which colloidal particles or polymer molecules coalesce to form a nanoporous network structure, and the pores are filled with a gaseous dispersion medium. The solid phase and pore structure are both on the nanoscale. It is a new type of nano, porous, low-density, amorphous material with a continuous three-dimensional network structure, and the typical network diameter is nanoscale. Due to its translucent color and ultra-light weight, it is sometimes called For "solid smoke". This material seems fragile, but because its nanoporous network structure effectively suppresses solid, gaseous and radiative heat conduction, it is actually very strong and durable, and can withstand high temperature...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/005C04B2201/50C04B2103/0012C04B2111/40C04B2201/32
Inventor 李云辉崔文博吴贞朱果逸高秀霞
Owner CHANGCHUN UNIV OF SCI & TECH
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