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Preparation method for foaming-cement reinforced SiO2-TiO2 composite aerogel material

A composite aerogel and foamed cement technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of low use temperature, high thermal conductivity, inability to use high-temperature thermal equipment, etc., to improve high-temperature heat insulation Performance, good occlusion effect

Inactive Publication Date: 2018-03-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not have the ability to resist compression and folding, and pure silica airgel is completely transparent to infrared light of 3 to 8 microns, so when the temperature of the application environment rises, the airgel will lose its unique heat insulation effect
Foamed cement is made by introducing a foaming agent into the cement slurry to form a high degree of foaming, but its thermal conductivity is high and the service temperature is low, so it cannot be used in high-temperature thermal equipment.

Method used

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  • Preparation method for foaming-cement reinforced SiO2-TiO2 composite aerogel material
  • Preparation method for foaming-cement reinforced SiO2-TiO2 composite aerogel material
  • Preparation method for foaming-cement reinforced SiO2-TiO2 composite aerogel material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] Add 80ml of TEOS, 144ml of absolute ethanol, and 40ml of deionized water into the beaker, stir well, add 1.2ml of ethanol solution of 3mol / L nitric acid to adjust the pH to 3, seal it, heat at 50°C and stir at 600r / min for 1h to obtain SiO 2 Sol. Add 16ml of TBOT and 36ml of deionized ethanol into the beaker, after stirring, add 1.3ml of ethanol solution of 3mol / L nitric acid to adjust the pH to 3.5 to obtain a solution ①; add 10ml of dehydrated ethanol and 4ml of deionized water into the beaker, add 3mol / L nitric acid ethanol solution 0.1ml to adjust the pH to 3.5 to obtain solution ②, slowly add solution ② to solution ①, and stir vigorously to form TiO 2 Sol. Get 260ml silica sol and 65ml titanium sol and mix evenly, use the ethanol solution of 105ml ammonia water (V 浓氨水 :V 乙醇 =1:45) to get SiO after adjusting the pH to 6 2 -TiO 2 The composite sol is ready for use. Set the density to 0.28g / cm 3 , Thermal conductivity at room temperature is 0.095W·m -1 ·K -...

example 2

[0041]Add 100ml of TEOS, 120ml of absolute ethanol, and 20ml of deionized water into the beaker, stir well, add 2.3ml of ethanol solution of 1mol / L hydrochloric acid to adjust the pH to 4, seal it, heat at 40°C and stir at 300r / min for 2h to obtain SiO 2 Sol. Add 18ml of TBOT and 30ml of absolute ethanol to a beaker, after stirring, add 2ml of ethanol solution of 1mol / L hydrochloric acid to adjust the pH to 4 to obtain a solution ①; add 20ml of absolute ethanol and 4ml of deionized water into a beaker, add 1mol / L 0.2ml ethanol solution of L hydrochloric acid to adjust the pH to 3.5 to obtain solution ②, slowly add solution ② to solution ①, and stir vigorously to form TiO 2 Sol. Get 240ml of silica sol and 72ml of titanium sol to mix and stir evenly, use the ethanol solution of 78ml of ammonia water (V 浓氨水 :V 乙醇 =1:55) to get SiO after adjusting the pH to 7 2 -TiO 2 The composite sol is ready for use. Set the density to 0.81g / cm 3 , Thermal conductivity at room temperat...

example 3

[0044] Add 65ml of TEOS, 88ml of absolute ethanol, and 25ml of deionized water into the beaker. After stirring well, add 2.5ml of ethanol solution of 2mol / L sulfuric acid to adjust the pH to 4. After sealing, heat at 45°C and stir at 450r / min for 1.5h Get SiO 2 Sol. Add 20ml of TBOT and 30ml of deionized ethanol in a beaker, after stirring, add 2.8ml of ethanol solution of 2mol / L sulfuric acid to adjust the pH to 3 to obtain a solution①; add 18ml of dehydrated ethanol and 4.2ml of deionized water into a beaker, stir and add 0.2ml of 3mol / L ethanol solution of sulfuric acid to adjust the pH to 4 to obtain solution ②, slowly add solution ② to solution ①, and stir vigorously to form TiO 2 Sol. Get 175ml-silica sol mixed with 70ml titanium sol and stir evenly, use the ethanol solution of 65ml ammonia water (V 浓氨水 :V 乙醇 =1:50) to get SiO after adjusting the pH to 6 2 -TiO 2 The composite sol is ready for use. Set the density to 0.63g / cm 3 , Thermal conductivity at room temp...

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Abstract

The invention relates to a preparation method for a foaming-cement reinforced SiO2-TiO2 composite aerogel material. The method comprises the following steps: firstly, preparing a silica sol and preparing a titanium sol, then compounding the above two sols, compounding foaming cement through a vacuum impregnation method, performing aging on a gel, and performing drying treatment to obtain the aerogel material. According to the invention, a synchronous sol process is used to realize mixing of a SiO2 aerogel component and a TiO2 aerogel component at the molecular level, and TiO2 is used as an opacifier to be uniformly compounded in a SiO2 aerogel system in situ, so that better shielding effects on infrared heat radiation under a high temperature are realized, and thermal insulation performance of an aerogel material under the high temperature is effectively improved; meanwhile, the foaming cement is used as a reinforcing phase to be compounded with a silicon-titanium binary aerogel, so that the defect that the aerogel material has no load-bearing capacity is overcome, and the thermal insulation effects, and especially the high temperature performance of the foaming cement material arefurther improved; and the prepared foaming-cement reinforced SiO2-TiO2 composite aerogel has a density of 0.32-0.86g / cm<3>, compressive strength of 0.56-3.62MPa, and a normal-temperature thermal conductivity coefficient of 0.038-0.146W*m<-1>*K<-1>.

Description

technical field [0001] The invention belongs to the field of preparation technology of nanoporous materials, and relates to a foamed cement reinforced SiO with high temperature resistance and low thermal conductivity 2 -TiO 2 Preparation method of composite airgel material. Background technique [0002] Airgel fiber mat is a widely used airgel product, which can be prepared by sol-gel and supercritical drying technology. However, it does not have the ability to resist compression and folding, and pure silica airgel is completely transparent to infrared light of 3 to 8 microns, so when the temperature of the application environment rises, the airgel will lose its unique heat insulation effect . Foamed cement is made by introducing a foaming agent into the cement slurry to form a high degree of foaming. However, its thermal conductivity is high and its service temperature is low, so it cannot be used in high-temperature thermal equipment. [0003] Therefore, it is necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/65
CPCC04B41/009C04B41/5041C04B41/65C04B2201/32C04B2201/50C04B2201/20C04B28/00C04B38/00C04B41/5035C04B41/4582C04B41/4539
Inventor 沈晓冬刘思佳吴晓栋崔升毛圣楠王立群
Owner NANJING UNIV OF TECH
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