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A kind of efficient preparation method of airgel and its application

An aerogel, high-efficiency technology, applied in chemical instruments and methods, silica, inorganic chemistry, etc., can solve problems such as complex process, unsatisfactory product drying process, and long production cycle

Active Publication Date: 2021-09-10
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
[0013] 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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  • A kind of efficient preparation method of airgel and its application
  • A kind of efficient preparation method of airgel and its application

Examples

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Effect test

preparation example Construction

[0042] Such as figure 1 A high-efficiency preparation method of an airgel shown, comprising the following steps:

[0043] 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;

[0044] 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;

[0045] 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

[0064] 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

[0067] 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

A high-efficiency preparation method of airgel and its application. The liquid preparation and hydrolysis in the early stage of the method are all completed in the reactor, using alkoxysilane as raw material, hydrolyzing it to form a sol, and entering into the intelligent production of airgel in the later stage After the system is integrated, it is intelligently controlled by the computer to realize the intelligent control of various electrical signals, and then control the operation of the transmission device, control the start and stop of the glue spray gun and the temperature and humidity in the liquid spray cabin, and control the heating and heat preservation cover I and the heating and heat preservation The temperature and holding time in the cover II; through intelligent glue spraying, the mold and the airgel products inside are transmitted in the airgel intelligent production integrated system to realize the continuous production of wet gel curing, aging and modification ; The product is obtained after drying, and the alkoxy alcohol produced by hydrolysis is recovered and recycled for the preparation of alkoxysilane. The invention reduces the transferred materials in the gel preparation process, simplifies the process, and reduces the production cost; at the same time, it also reduces the escape of volatile materials and is environmentally friendly.

Description

[0001] technology field` [0002] 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 [0003] 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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