Preparation method of silicon dioxide nanopore super thermal insulation material

A technology of thermal insulation material and silicon dioxide, which is applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of affecting normal use, decreased thermal insulation performance, poor thermal insulation effect, etc., and achieves improved performance and mechanical properties. , the effect of increasing the contact angle

Inactive Publication Date: 2017-10-03
王景硕
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is: the traditional silicon dioxide nanoporous super heat insulation material has low mechanical properties, poor heat insulation effect, and high water absorption rate, which leads to the decline of heat insulation performance of the material during use and storage and affects its normal use. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] First, pour ethyl orthosilicate and tetrabutyl titanate into a beaker at a volume ratio of 30:1, stir and mix with a magnetic stirrer at a speed of 500r / min for 60min to obtain a mixed solution; then mix the obtained mixed solution with absolute ethanol According to the volume ratio of 0.8:1, mix and pour into the reaction kettle, then add 0.02mol / L oxalic acid solution with a concentration of 1.8 times the volume of absolute ethanol to the reaction kettle, and then seal the reaction kettle, at a temperature of 65°C and a speed of 500r Under the condition of sealed constant temperature hydrolysis for 10 hours, after the hydrolysis is completed, open the reaction kettle, under constant temperature stirring, add 0.4 times the volume of absolute ethanol with mass fraction of 15% ammonia water dropwise while stirring, and control the dripping within 60 minutes , after the addition of ammonia water is completed, stop stirring, and let stand at a constant temperature for 10 mi...

example 2

[0027] First, mix tetraethyl orthosilicate and absolute ethanol at a volume ratio of 0.8:1 and pour it into the reactor, then add 0.02mol / L oxalic acid solution with a concentration of 1.8 times the volume of absolute ethanol into the reactor, and then remove the reactor Sealed, at a temperature of 65°C and a rotational speed of 500r / min, sealed and hydrolyzed at a constant temperature for 10 hours. After the hydrolysis was completed, open the reaction kettle, and add a mass fraction of 0.4 times the volume of absolute ethanol dropwise while stirring at a constant temperature. It is 15% ammonia water, and it is controlled to be dripped within 60 minutes. After the ammonia water is added dropwise, stop stirring, and let it stand at a constant temperature for 10 minutes. 36h, then carry out solvent exchange with n-hexane 5 times, the total exchange time is 36h, after the solvent exchange is completed, let stand and age at room temperature for 40h to obtain a wet gel; then take 50...

example 3

[0029]First, pour ethyl orthosilicate and tetrabutyl titanate into a beaker at a volume ratio of 30:1, stir and mix with a magnetic stirrer at a speed of 500r / min for 60min to obtain a mixed solution; then mix the obtained mixed solution with absolute ethanol According to the volume ratio of 0.8:1, mix and pour into the reaction kettle, then add 0.02mol / L oxalic acid solution with a concentration of 1.8 times the volume of absolute ethanol to the reaction kettle, and then seal the reaction kettle, at a temperature of 65°C and a speed of 500r Under the condition of sealed constant temperature hydrolysis for 10 hours, after the hydrolysis is completed, open the reaction kettle, under constant temperature stirring, add 0.4 times the volume of absolute ethanol with mass fraction of 15% ammonia water dropwise while stirring, and control the dripping within 60 minutes , after the addition of ammonia water is completed, stop stirring, and let stand at a constant temperature for 10 min...

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PUM

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Abstract

The invention discloses a preparation method of a silicon dioxide nanopore super thermal insulation material, and belongs to the technical field of heat preservation and thermal insulation materials. The preparation method is characterized in that firstly, tetraethyl orthosilicate and tetrabutyl titanate are used as raw materials; an oxalic acid solution and ammonium hydroxide are used as acid-base catalysts; after the raw materials are hydrolyzed in an absolute ethyl alcohol system, then solvent exchange and aging are performed; wet gel containing silicon dioxide and titanium dioxide is obtained; then, the dehydration condensation reaction is performed through heating by using terephthalic acid as a modifying agent and concentrated sulfuric acid as a catalyst; next, drying is performed after water washing, ethanol washing and normal hexane washing are sequentially performed; the silicon dioxide nanopore super thermal insulation material is obtained. The obtained product of the silicon dioxide nanopore super thermal insulation material disclosed by the invention has a good thermal insulation performance, an excellent mechanical performance and hydrophobicity; the use range of the silicon dioxide nanopore super thermal insulation material can be effectively expanded.

Description

technical field [0001] The invention discloses a method for preparing a silicon dioxide nanoporous super heat insulating material, which belongs to the technical field of heat insulating material preparation. Background technique [0002] Nanoporous super heat insulation material refers to the heat insulation material whose thermal conductivity is lower than that of "no convection air". It has the advantages of high thermal conductivity and low thermal conductivity, and is an ideal thermal insulation material. Silica airgel is currently the most widely studied thermal insulation material, with a porosity as high as 80-99.8%, a typical pore size of 1-100 nm, and a specific surface area of ​​200-1000 m 2 / g, while the density can be as low as 3kg / m 3 , the thermal conductivity at room temperature is as low as 12mW / (m·K). [0003] Pure silica airgel has poor thermal insulation effect, is not resistant to high temperature, and has low mechanical properties. However, nanoporou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B111/40
CPCC04B38/0045C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B38/0067C04B38/0054
Inventor 张永华许蘅
Owner 王景硕
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