Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method for composite silicon dioxide aerogel felt

A technology of composite silica and airgel felt, which is applied in the field of thermal insulation materials, can solve the problems of large investment, poor safety, and low efficiency, and achieve the effects of overcoming large investment, saving production costs, and simple preparation methods

Active Publication Date: 2018-10-16
XUYI BOTU ATTAPULGITE CLAY HIGH TECH DEV +1
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the invention is to provide a composite SiO 2 The preparation method of the airgel felt overcomes the shortcomings of the traditional supercritical drying process, such as large investment, low efficiency and poor safety, and the preparation method provided by the invention can be dried under normal pressure without repeated solvent replacement and surface modification. , shorten the preparation cycle, save production costs, and facilitate industrial production

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
  • Preparation method for composite silicon dioxide aerogel felt
  • Preparation method for composite silicon dioxide aerogel felt

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of composite silica airgel felt provided by the invention comprises the following steps:

[0035] (1) Mix the silicon source, ethanol and deionized water evenly, add an acidic catalyst until the pH is 2-3, and obtain a silica sol;

[0036] (2) adding an alkaline catalyst to the silica sol obtained in step (1), adjusting the pH to be 6 to 8, stirring, soaking the fiber mat in the silica sol obtained in step (1), so that the silica sol completely covers the fiber mat, Take it out, seal it and let it stand to obtain the fiber mat-silica gel composite;

[0037] (3) taking out the fiber mat-silica gel composite obtained in step (2) from the mold, and immersing in aqueous sodium bicarbonate solution for solvent replacement for 6-24 hours;

[0038] (4) Taking out the fiber mat-silica gel composite after solvent replacement, and drying to obtain a composite silica airgel mat.

Embodiment 1

[0040] At room temperature (25°C), mix tetraethyl orthosilicate, ethanol and deionized water according to the molar ratio of 1:4:2 and stir evenly, add 1mol / L hydrochloric acid solution to adjust the pH to 2, stir for 30min, and fully hydrolyze ; add 0.1mol / L sodium hydroxide solution to adjust the pH to 6, and get a uniformly mixed silica sol after stirring; soak the glass fiber mat in the silica sol obtained above, make the silica sol cover the glass fiber mat, then take it out, seal the static Fiberglass Mat-SiO 2 Gel composite; the glass fiber mat obtained by standing still-SiO 2 The gel complex was immersed in 0.10 mol / L sodium bicarbonate aqueous solution for 6 hours; after replacement, it was dried at 50°C for 20 minutes, then cleaned with deionized water, dried at 80°C for 12 hours, 120°C for 8 hours, and then dried at 270°C Dry for 6 hours to obtain a composite silica airgel felt.

Embodiment 2

[0042] At room temperature (25°C), mix tetraethyl orthosilicate, ethanol and deionized water according to the molar ratio of 1:8:4 and stir evenly, add 1mol / L acetic acid solution to adjust the pH to 3, stir for 30min, and fully hydrolyze ; add 0.1mol / L potassium hydroxide solution to adjust the pH to 7, and obtain a uniformly mixed silica sol after stirring; soak the attapulgite fiber felt into the silica sol obtained above, make the silica sol cover the glass wool felt, and then take it out, Attapulgite clay fiber mat-SiO was obtained by sealing and standing still 2 Gel composite; the attapulgite fiber mat obtained by standing still-SiO 2 The gel complex was immersed in 0.20mol / L sodium bicarbonate aqueous solution for solvent replacement for 12 hours; after the replacement, it was dried at 50°C for 20 minutes, then cleaned with deionized water, dried at 120°C for 10 hours, and then dried at 270°C for 6 hours to obtain a composite Silica airgel felt.

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 preparation method for a composite silicon dioxide aerogel felt. The preparation method comprises the following steps that (1) a silicon source, ethanol and deionized water are uniformly mixed, and an acid catalyst is added until the pH value is 2-3 so as to obtain silica sol; (2) a basic catalyst is added into the silica sol obtained in the step (1), the pH value is adjusted to be 6-8, stirring is carried out, a fiber felt is soaked into the silica sol obtained in the step (1), the silica sol is enabled to completely cover the fiber felt, then the fiber felt is takenout, and sealing and standing are carried out so as to obtain a fiber felt-silicon dioxide gel composite body; (3) the fiber felt-silicon dioxide gel composite body obtained in the step (2) is takenout from a mold and is impregnated in a sodium bicarbonate aqueous solution for solvent replacement; and (4) the fiber felt-silicon dioxide gel composite body is taken out after solvent replacement and is dried so as to obtain the composite silicon dioxide aerogel felt. The composite silicon dioxide aerogel felt prepared through the method has the advantages of being complete, free of cracks and quite excellent in physical and structural properties.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, in particular to a composite SiO 2 The preparation method of airgel blanket. Background technique [0002] With the development of the global economy, energy shortage has become one of the major problems that cannot be ignored in the sustainable development of society. There are three solutions: one is open source, the other is throttling, and the third is heat preservation. Insulation materials are known as the "fifth energy source". All countries in the world attach great importance to its development. In energy conservation work, vigorously developing and actively promoting the application of insulation materials is also the most effective and feasible measure generally adopted by countries all over the world. At present, the main traditional fibrous insulation materials are mostly produced by wet or dry processes. These products have high mechanical strength and wide ap...

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): C04B30/02
CPCC04B30/02C04B2201/20C04B2201/32C04B2201/50C04B14/42C04B14/4643C04B14/46
Inventor 郭建军陈凯周灿伟刘丰华许高杰
Owner XUYI BOTU ATTAPULGITE CLAY HIGH TECH DEV