Airgel Composite Membranes Produced by Halogen-Free and Ammonia-Free Supercritical Process

An aerogel, composite roll technology, applied in ceramic products, other household appliances, household appliances and other directions, can solve the problem of reducing the thermal insulation performance and use experience of aerogel products, affecting the performance and service life of aerogel products, Limiting the use temperature and fire resistance of aerogel products to achieve the effect of eliminating irritating odor, eliminating unorganized escape and improving the speed of hydrolysis

Active Publication Date: 2022-05-03
响水华夏特材科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent CN201810005328 reports a method for preparing silica airgel composite materials using a chlorine-free and alcohol-free process. The fire resistance and strength of airgel products will destroy the continuous three-dimensional network structure of airgel nanoporous, and at the same time, it is easy to produce toxic and harmful gases when used at high temperature, which will affect the performance and service life of airgel products, and limit the The service temperature and fire performance of airgel products
In addition, the report adopts an atmospheric pressure drying process, which is difficult to avoid the destruction of the microstructure of the gel caused by capillary force during the drying process, which will seriously pulverize the final product and reduce the thermal insulation performance and user experience of the airgel product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 115.7kg of ethyl orthosilicate, add 268.8kg of ethanol and 40.0kg of water, heat in a circulating water bath, keep warm at 40°C, and stir for 24 hours to obtain the first mixed solution; weigh 30.1kg of modified organic silicon ester, 361.9kg of ethanol kg and 9.1kg of water, after stirring for 24 hours, add 603g of liquid caustic soda with a concentration of 15%, and stir evenly to obtain the second mixed solution; mix the first mixed solution and the second mixed solution at 1:1, and use a static mixer to carry out After online mixing, the third mixed solution was obtained, and the glass fiber needle mat was immersed in the third mixed solution. After 15 minutes, a gel composite material was formed; The volume accounts for 80% of the volume of the barrel. Fill the gap between the outer wall of the barrel and the inner wall of the drying kettle with ethanol. The amount of ethanol accounts for 75% of the gap volume. Perform supercritical drying: after closing the c...

Embodiment 2

[0029] Weigh 130.6 kg of tetraethyl orthosilicate, add 242.9 kg of ethanol and 56.4 kg of water, heat in a circulating water bath, keep warm at 40°C, and stir for 24 hours to obtain the first mixed solution; weigh 34.1 kg of modified organic silicon ester, 351.9 kg of ethanol kg and 17.2kg of water, after stirring for 24 hours, add 587g of liquid caustic soda with a concentration of 15%, and stir evenly to obtain the second mixed solution; mix the first mixed solution and the second mixed solution at 1:1, and use a static mixer to carry out After online mixing, the third mixed solution was obtained, and the glass fiber needle mat was immersed in the third mixed solution. After 10 minutes, a gel composite material was formed; The volume accounts for 80% of the volume of the barrel. Fill the gap between the outer wall of the barrel and the inner wall of the drying kettle with ethanol. The amount of ethanol accounts for 75% of the gap volume. Perform supercritical drying: after cl...

Embodiment 3

[0032]Weigh 100.2 kg of tetraethyl orthosilicate, add 279.5 kg of ethanol and 43.3 kg of water, heat in a circulating water bath, keep warm at 40°C, and stir for 24 hours to obtain the first mixed solution; weigh 24.9 kg of modified organic silicon ester, 363.9 kg of ethanol kg and 12.6kg of water, after stirring for 24 hours, add 606.4g of liquid caustic soda with a concentration of 15%, and stir evenly to obtain the second mixed solution; mix the first mixed solution and the second mixed solution at a ratio of 1:1, and use a static mixer After on-line mixing, the third mixed solution was obtained, and the glass fiber needle felt was immersed in the third mixed solution. After 10 minutes, a gel composite material was formed; The material volume accounts for 80% of the barrel volume. Fill the gap between the outer wall of the barrel and the inner wall of the drying kettle with ethanol, and the amount of ethanol accounts for 75% of the gap volume. Perform supercritical drying: a...

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Abstract

The invention discloses an airgel composite coil produced by a halogen-free and ammonia-free supercritical process. The airgel composite coil has a density of 160-180kg / m3, a thermal conductivity of ≤0.018W / (m·K), and a hydrophobic Rate ≥ 99.5%, vibration mass loss rate < 0.1%. Its preparation process includes the following steps: S1 uses tetraethyl orthosilicate as raw material, adds ethanol and water, and heats it at 50°C for 24 hours to obtain the first mixed solution; adds alkali without ammonia to modified organic silicon ester, ethanol and water to obtain the second mixed solution; S2, mix the first mixed solution and the second mixed solution in proportion to obtain the third mixed solution, and immerse the fiber coil in the third mixed solution to form a gel composite coil ; S3, subjecting the gel composite coil to supercritical drying to obtain the halogen-free and ammonia-free airgel composite coil of the present invention. This product does not contain halogen elements, and at the same time does not volatilize the irritating gas containing ammonia at high temperature. It can be used for heat insulation in indoor high temperature environment and fire protection and heat insulation under the condition of thermal instability.

Description

technical field [0001] The invention relates to the field of nanoporous airgel composite thermal insulation products. More specifically, the present invention relates to an airgel composite coil produced by a halogen-free and ammonia-free supercritical process. Background technique [0002] Airgel is a nanoporous, low-density, amorphous solid material with a continuous three-dimensional network structure. The common silica airgel has a porosity of over 90% and an average pore size of 20-40nm. It has the advantages of low thermal conductivity, low density, and small specific heat capacity. It plays an important role in the fields of heat insulation, flame retardant and fire prevention. At present, silica airgel has been put into production and use at home and abroad, and the domestic industrialization scale is growing rapidly. It has been put into use in many fields such as industrial equipment and pipelines, new energy vehicles, fire safety, building fire protection and ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02C04B38/00
CPCC04B30/02C04B38/0045C04B2201/32C04B2201/20C04B14/064C04B14/42C04B38/0067
Inventor 陈勇陈世忠段国栋
Owner 响水华夏特材科技发展有限公司
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