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Efficient preparation method and application of aerogel

An airgel and high-efficiency technology, applied in chemical instruments and methods, silica, inorganic chemistry, etc., can solve the problems of unsatisfactory product drying process, long production cycle, complicated process, etc., and achieve the reduction of chemical waste gas pollution , short production cycle and simplified process

Active Publication Date: 2020-02-11
徐州绿肯环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution has problems such as long production cycle, complex process and high cost
[0012] To sum up, the sol-gel method of the prior art has a relatively complicated process, and requires extremely high costs and a long production cycle, which leads to the preparation of silica airgel products, regardless of the product operation process, raw material selection and The utilization of by-products and the drying process of the product are not satisfactory. Therefore, it is necessary to develop an efficient method to prepare silica airgel with better physical properties through a simpler process

Method used

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  • Efficient preparation method and application of aerogel
  • Efficient preparation method and application of aerogel

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preparation example Construction

[0041] Such as figure 1 A high-efficiency preparation method of an airgel shown, comprising the following steps:

[0042] a. Add alkoxysilane, alkoxy alcohol, deionized water and acidic catalyst to reactor 1 to prepare mixed solution, and obtain silica sol after hydrolysis in reactor 1;

[0043] b. The silica sol is transported to the material mixer 2, and at the same time, a curing agent is added to the material mixer 2, and the mixture is uniformly mixed to obtain a mixed material;

[0044] c. The mixed material is transported to the glue spray cabin 4 in the airgel intelligent production integrated system 3. The airgel intelligent production integrated system 3 also includes a heating insulation cover I5, a liquid spray cabin 6, a heating insulation cover II7, and glue spraying Cabin 4, heating and heat preservation cover I5, liquid spraying cabin 6, and heating and heat preservation cover II7 are connected through a transmission device 8; the mixed material is sprayed in...

Embodiment 1

[0063] Add tetraethoxysilane, ethanol, deionized water and hydrochloric acid to Reactor 1 to prepare a mixed solution. The molar ratio between tetraethoxysilane, ethanol, deionized water and hydrochloric acid is 1:12:4: 0.001, the temperature of reactor 1 is controlled to be 90°C; tetraethoxysilane is hydrolyzed in reactor 1 for 10 minutes, and after completion, it is transported to material mixer 2, and at the same time, curing agent ammonia water is added to material mixer 2 to obtain The homogeneous mixture of silica sol and curing agent ammonia water; then it is quickly transported to the glue spray cabin 4 in the airgel intelligent production integrated system 3, and the mixed material is sprayed into the forming mold, and the forming mold and the mixed material inside are transported to the In the heating and heat preservation cover I5, control the temperature in the heating and heat preservation cover I5 to 60°C, keep the temperature for 5 minutes, and realize the curing...

Embodiment 2

[0066] Trimethoxysilane, methanol, deionized water and CH 3 COOH was added to Reactor 1 to prepare a mixed solution, trimethoxysilane, methanol, deionized water and CH 3 The molar ratio between COOH is 1:30:18:0.01, and the temperature of reactor 1 is controlled at 50°C; trimethoxysilane is hydrolyzed in reactor 1 for 20 minutes, and is transported to material mixer 2 after hydrolysis is completed. , add the curing agent KOH into the material mixer 2, and then quickly transport it to the glue spray cabin 4 in the airgel intelligent production integrated system 3, spray the mixed material into the forming mold, and the forming mold is transported with the mixed material inside Go to the heating and heat preservation cover I5, control the temperature in the heating and heat preservation cover I5 to 50°C, keep it warm for 30 minutes, and realize the curing of the silica sol under heating conditions to obtain a gel; after curing, the forming mold and the mixed material inside are ...

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Abstract

The invention discloses an efficient preparation method and an application of aerogel. Early-stage liquid preparation and hydrolysis are completed in a reactor, alkoxysilane is used as a raw materialand is hydrolyzed to form a sol, and the sol enters an intelligent aerogel production integration system in the later stage, and the system is intelligently controlled by a computer to realize intelligent control of various electric signals in order to control the operation of a transmission device, control the starting and stopping of a gel spraying gun and the temperature and humidity in a liquid spraying cabin and control the temperature and the heat preservation time in a first heating heat preservation cover and a second heating heat preservation cover; intelligent gel spraying is carriedout to make a mold and the aerogel product in the mold conveyed in the intelligent aerogel production integration system, so continuous production of solidification, aging and modification of wet gelis achieved; and the wet gel is dried to obtain the product, and a hydrolysis byproduct alkoxy alcohol is recovered, and is recycled for preparing the alkoxysilane. The preparation method has the advantages of reduction of material transfer in the gel preparation process, process simplification, reduction of the production cost, reduction of escape of volatile materials, and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, and in particular relates to a high-efficiency preparation method of airgel and its application. Background technique [0002] Silica airgel is a typical three-dimensional nanoporous material, composed of more than 95% air and less than 5% Si skeleton, with an average pore size of 20-50nm and a very high specific surface area of ​​500-1200m 2 / g, very low density 0.003~0.10g / cm 3 And extremely low thermal conductivity 0.011 ~ 0.021W / m·K (at room temperature). High-purity silica airgel is widely used in the preparation of Cherenkov detectors, special optical equipment, supercapacitors, sound-absorbing and sound-absorbing materials, and drug carriers. However, due to its poor mechanical properties and the presence of -OH groups on the surface are hydrophilic When used in the thermal insulation market, silica airgel powder and particles need to be made, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16C01B33/158C01B33/159
CPCC01B33/1585C01B33/159C01B33/163C01P2006/32
Inventor 张建立佟峰蒋立民
Owner 徐州绿肯环保科技有限公司
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