Preparation method of high-temperature-resistant aerogel and aerogel-type porous ceramics

A porous ceramic, high temperature resistant technology, applied in ceramic products, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as aerogel densification, and achieve high porosity, high specific surface area, and adjustable pore size.

Pending Publication Date: 2017-08-29
浙江圣润纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat treatment temperature generally does not exceed 500°C. If the heat treatment temperature is too high, the nanoscale pores will collapse and cause the airgel to be completely densified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare silica sol according to the method of patent CN2014102703529. The solid content of silica sol is 8%, and the pH value is 3.0. Take 1000g of silica sol, 30g of silicon oxide powder with a particle size below 2um, and 40g of silicon nitride powder with a particle size below 5um. , mechanically stirred at 1200r / min for 5 minutes, and then ultrasonically dispersed for 3 minutes to obtain the precursor, and then mechanically stirred the precursor while adding 0.5mol / L ammonia water to adjust the pH value to 4.6, and then gelled after standing for 10 minutes; The gel was aged in a water bath at 60°C for 10 hours, and then replaced and modified with hexamethyldisilazane. During the replacement modification, a radio frequency with a frequency of 2450 MHz and a power of 500 w was used for radio frequency radiation. After 27 minutes, the modification was completed, and the gel was placed in Dry under normal pressure under an infrared lamp, and finish drying after 20 minute...

Embodiment 2

[0050] Prepare silica-zirconia sol according to the method of patent CN2015102953891. The solid content of the sol is 10%, and the pH value is 3.5. Take 1000g of the sol, 35g of titanium oxide powder with a particle size below 1um, and zirconium silicate with a particle size below 3um. Powder 40g, mechanically stirred at 1500r / min for 10 minutes to obtain the precursor; then, while mechanically stirring the precursor, add 0.5mol / L ammonia water dropwise to adjust the pH value to 4.7, soak the alumina fiber for 9 minutes and gel. The gel was subjected to radio frequency radiation at 60°C with a frequency of 2450MHz and a power of 500w. After 30 minutes, the aging was completed, and then modified with trimethylchlorosilane at 65°C for 2 hours, and then the gel was placed in a vacuum drying oven to heat up. Dry at 80°C, and finish drying after 40 minutes to obtain a high temperature resistant aerogel. The high temperature resistant airgel has a density of 270kg / m 3 , The average...

Embodiment 3

[0052] Dissolve 129.59g of nickel chloride in 500g of a mixture of ethanol and water with an ethanol concentration of 80%, add 0.2g of polyacrylic acid, 0.3g of propylene oxide, and 40g of nickel oxide powder with a particle size of 1um or less while stirring. 10g of molybdenum boride powder below 2um, mechanically stirred at 1600r / min for 10 minutes to obtain the precursor; while stirring, add dropwise 0.5mol / L ammonia water to the precursor to adjust the pH value to 5.0, with a frequency of 2450MHz and a power of 300w Radio frequency radiation, gel after 5min; age the gel in a water bath at 55°C for 24h, then replace the solvent with absolute ethanol, and then perform supercritical drying with CO2 at a drying temperature of 50°C and a pressure of 15MPa for 4h After that, high temperature resistant airgel is obtained. The high temperature resistant airgel has a density of 310kg / m 3 , The average pore diameter is 15nm, the porosity is 56%, and the volume shrinkage rate is 3% ...

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PUM

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Abstract

The invention discloses a preparation method of high-temperature-resistant aerogel. The method comprises: adding high-temperature-resistant powder or crystal whiskers to sol, performing in-situ compounding of sol and high-temperature-resistant powder or crystal whiskers, and performing aging, modification and drying to obtain high-temperature-resistant aerogel. The invention further discloses a preparation method of aerogel-type porous ceramics. Porous ceramics having an aerogel hole structure kept is obtained by sintering the high-temperature-resistant aerogel. The prepared high-temperature-resistant aerogel and aerogel-type porous ceramics can resist high temperature of 1000-1800 DEC C or more, keep the nanometer hole structure from collapse, have high porosity and strength and have hole diameters which can be adjusted from micropores to large holes. The aerogel and aerogel-type porous ceramics can be used as a super thermal insulation material and can be widely applied to fields of purification separation, adsorption, chemical industrial catalytic carriers, sound absorption and damping, sensing elements and electrochemistry. The method is simple and easy to carry out and suitable for massive production, and allows high temperature resistance of aerogel to be improved and application fields of aerogel to be broadened.

Description

technical field [0001] The invention relates to a preparation method of airgel and porous ceramics, in particular to a preparation method of high-temperature-resistant airgel and airgel-type porous ceramics. Background technique [0002] Porous ceramics, also known as microporous ceramics and foam ceramics, have a three-dimensional network skeleton structure and were first successfully developed in the United States in 1978. According to the pore size, porous ceramics can be divided into: microporous ceramics (pore size less than 2 nm), mesoporous ceramics (pore size between 2 and 50 nm) and macroporous ceramics (pore size greater than 50 nm). The primary feature of porous ceramics is their porous properties, and the key and difficult point of preparation is to form a porous structure. According to the purpose of use and the requirements for material properties, many different preparation technologies have been gradually developed in recent years. Among them, the applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16C04B38/08C04B35/14C04B35/624C04B35/622C01G25/00C04B35/49C01G53/04C04B35/01
CPCC01B33/16C01G25/00C01G53/04C01P2006/32C04B35/01C04B35/14C04B35/49C04B35/622C04B35/624C04B38/0054C04B38/085C04B2235/3217C04B2235/3427C04B2235/3804C04B2235/3873C04B2235/9607
Inventor 金承黎
Owner 浙江圣润纳米科技有限公司
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