Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing silica aerogel material

A silicon dioxide and aerogel technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of long preparation cycle and the preparation process route needs to be optimized, and achieve low density, good hydrophobicity, and concentrated pore size distribution. Effect

Active Publication Date: 2010-04-07
中科润资科技股份有限公司
View PDF4 Cites 110 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Compared with the supercritical drying process, the preparation of SiO by atmospheric pressure drying 2 Airgel greatly reduces the cost and operational risk, the equipment used is simple and can be produced continuously, and the SiO 2 The possibility of industrial production of airgel, but some normal pressure drying methods have a long preparation period, and the preparation process route needs to be optimized

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing silica aerogel material
  • Method for preparing silica aerogel material
  • Method for preparing silica aerogel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The molar ratio of raw materials is TEOS:EtOH:MTMS:H 2 O=1:10:0.3:8, mix 5.5ml of TEOS and 14.4ml of absolute ethanol into the container and start stirring, then add 1.4ml of MTMS modifier, continue stirring, and slowly add 4.5ml of Distilled water, after another 10 minutes of stirring, add hydrochloric acid alcohol solution dropwise, adjust the pH value, so that the pH value of the solution is between 1.5 and 2.0; after stirring continuously for 8 hours, slowly add a certain amount of ammonia water and alcohol solution, so that the final pH value of the system is between 7.5 and 2.0 8.0. Stop stirring after 10min, put SiO 2 The sol was poured into the mold and left to stand for about 1 hour until the sample gelled. After the gel is formed, soak the wet gel in an ethanol solution and let it stand for aging. The aging temperature is 55°C and the aging time is 5h; The ratio by volume is: TMCS:EtOH:n-hexane=1:1:8; modified under sealed conditions for 1-2 days. After mod...

Embodiment 2

[0051] The molar ratio of raw materials is TEOS:EtOH:MTES:H 2 O=1:10:0.4:6, mix 5.5ml of TEOS and 14.4ml of absolute ethanol into the container and start stirring, then add 2ml of MTES modifier, continue stirring, and slowly add 2.7ml of distilled water after 15min After stirring evenly, add hydrochloric acid alcohol solution dropwise, and adjust the pH value at about 2.0; after continuous stirring for 8-10 hours, slowly add a certain amount of ammonia water alcohol solution, so that the final pH value of the system is about 8.0. After a few minutes, the stirring was stopped, and the SiO 2 The sol was poured into the mold and left to stand for about 1 hour until the sample gelled. The wet gel was soaked in ethanol solution for aging, the aging temperature was 50°C, and the aging time was 6h; after aging, the gel was soaked in the secondary mixed modification solution, and the composition of the secondary modification solution was: TMCS: Absolute ethanol: n-hexane = 2:3:15; m...

Embodiment 3

[0054] The molar ratio of raw materials is TEOS:EtOH:MTMS:H 2 O=1:10:0.3:10, mix 5.5ml of TEOS and 14.4ml of absolute ethanol into the container and start stirring, then add 1.1ml of MTMS modifier, continue stirring, and slowly add 3.6ml of Distilled water, after another 15 minutes, evenly add dilute alcohol solution of hydrochloric acid, adjust the pH value of the solution at 1.5-2.0; The final pH value of the system is 7.5-8.0. Stop stirring after 10 minutes, and SiO 2 The sol was poured into the mold and left to stand for about 1 hour until the sample gelled. After the gel is formed, add a small amount of ethanol to the mold to age the gel soaked in ethanol, and age at 60°C for about 6 hours; then use the prepared secondary modification solution for sealing modification, and the ratio of the modification solution is as follows The volume ratio is TMCS: absolute ethanol: n-hexane = 1:1:8; after about 2 days of modification, the sample is taken out and washed with n-hexane,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for preparing a silica aerogel material and relates to the method for preparing the aerogel material, in particular to the method for rapidly preparing a transparent SiO2 aerogel by being based on the sol-gel technology and adopting secondary modification and normal pressure drying. The invention provides the method for preparing the silica aerogel material, and the method has simple technology, short cycle, low cost and good safety and is conductive to large-scale production. Tetraethoxysilane is adopted as a silicon source, methyl trimethoxysilane or methyl triethoxysilane is taken as a modifier of a co-precursor, anhydrous ethanol is taken as a solvent, and hydrochloric acid and ammonia are taken as catalysts. The sol-gel acid-base two-step method is adopted for catalysis, thereby preparing the SiO2 wet gel; and the further modification is carried out on a wet gel sample after aging treatment under certain conditions, and the normal pressure low-temperature drying is finally carried out in air atmosphere, thereby preparing the SiO2 aerogel. The equipment cost during the preparation technology is low, the product has good performances and the reaction process is controllable.

Description

technical field [0001] The invention relates to a preparation method of an airgel material, in particular to a method based on sol-gel technology and adopting secondary modified atmospheric pressure drying to rapidly prepare transparent SiO 2 Airgel method. Background technique [0002] Airgel is the lightest solid known in the world, and it is included in the Guinness Book of World Records. Airgel is mainly divided into inorganic oxide aerogel, organic aerogel and carbon gas obtained by carbonization of organic aerogel. gel. Silicon dioxide (SiO 2 ) airgel was first prepared by Kistler of Stanford University in 1931 through sol-gel method and supercritical drying technology. [0003] SiO 2 Airgel is a kind of material with high specific surface area (500~1500m 2 / g), high porosity (80%~99.8%), low density (~0.03g / cm 3 ), low refractive index (1~1.1), low thermal conductivity (~0.01W·m -1 ·K -1 ), low dielectric constant (1.0-2.0) and other nano-porous solid material...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B33/14
Inventor 程璇吴国友余煜玺张颖
Owner 中科润资科技股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com