Manufacturing method for silica aerogel blanket and manufacturing apparatus therefor

A technology of silica and airgel felt, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as damage, uneven impregnation, and degraded insulation performance, and achieve uniform airgel pore structure, Reduced production costs and excellent thermal insulation performance

Active Publication Date: 2020-02-07
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the disadvantage is that when the silica precursor sol is mixed with the gelation catalyst, the sol-gel chemical reaction starts immediately, and the viscosity of the mixed solution increases, so that particles are formed before fully impregnated into the fiber, making it difficult to control the gelation rate , and the gelled airgel is damaged or lost during processing, deteriorating the insulating properties of the final product
[0008] In addition, when the precursor sol and the gelling catalyst are injected onto the moving element as in the Roll-to-Roll process, the precursor sol and the gelling catalyst cannot be sufficiently impregnated into the moving element. In fiber mats on the surface, uneven impregnation occurs on the surface of the mat, thereby deteriorating its insulating properties
When increasing the injection volume of precursor sol and gelling catalyst to prevent such problems, beyond the amount that can be impregnated into the fiber mat, the precursor sol and gelling catalyst beyond the impregnation amount will overflow from the moving element, causing process loss
In addition, since the overflow mixture subsequently gels, forming solids such as powder, this leads to a problem of being a process failure factor for mechanically operated handling devices

Method used

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  • Manufacturing method for silica aerogel blanket and manufacturing apparatus therefor
  • Manufacturing method for silica aerogel blanket and manufacturing apparatus therefor
  • Manufacturing method for silica aerogel blanket and manufacturing apparatus therefor

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preparation example Construction

[0095] In one embodiment of the present invention, the present invention uses a gel casting method for a continuous or semi-continuous gel preparation process wherein the formed gel is cooled. At lower temperatures, the vapor pressure of the solvent in the wet gel (silica gel felt) decreases significantly, thereby enabling a more economical process and a safer working environment. This economic benefit may be even more pronounced when solvent recovery is required when considering additional steps to recover solvent vapor. Especially at low temperatures, ie, below the flash point of the solvent, the likelihood of combustion is greatly reduced and safety for process operators is improved. Therefore, in one embodiment of the present invention, the step of distributing the gel precursor mixture at a predetermined rate so that the gel precursor mixture gels to form a silica wet gel mat; and cooling the prepared gel to reduce Steps in solvent evaporation rate.

[0096] In order to...

Embodiment 1

[0135] As a silica precursor, 9 kg of hydrolyzed TEOS was mixed with 27 kg of ethanol to prepare 32.5 liters of silica sol (target density (TD) 40 kg / m 3 ). Separately, mix 40.2 kg ethanol with 0.35 kg NH 4 OH (30% in water) was mixed to prepare a gelling catalyst solution. The silica sol was introduced into the impregnation tank at a constant flow rate of 1.2 L / min before the gel casting apparatus, and polyester fibers (glass fiber mat) conveyed at a constant speed were impregnated into the impregnation tank. The gelling catalyst solution was injected at 0.12 L / min onto the sol-impregnated fibers and dip tank. The fibrous mat impregnated with silica sol and gelation catalyst in the impregnation tank is then raised upwards along an incline while being conveyed at a constant speed on a conveyor belt, on which gelation takes place. The gelation was carried out for 10 minutes, and after gelation was complete, the gelled fiber mat was stabilized at room temperature (25° C.) for...

Embodiment 2 to 4

[0137] Silica airgel felt was manufactured in the same manner as in Example 1, except that 32.5 liters of silica sol (TD=60kg / m 3 、80kg / m 3 、100kg / m 3 ) and the gelling catalyst solution was added at 0.06L / min, 0.048L / min, 0.041L / min, respectively.

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Abstract

The present invention relates to a manufacturing method for a silica aerogel blanket and a manufacturing apparatus therefor, wherein physical properties of a silica aerogel blanket are easily controlled by separately feeding silica solation and gelation catalysts and controlling the time of gelation; a uniform pore structure of an aerogel and an improved heat-insulating performance thereof are attained by sufficiently and uniformly immersing the silica solation and gelation catalysts in the blanket within an immersion bath; the loss of silica solation and gelation catalysts is reduced by passing the silica solation and gelation catalysts through an uphill slope before gelation to thereby remove at least a proper immersion amount of the silica solation and gelation catalysts; the process troubles is less; and a silica aerogel blanket causing less dust can be provided.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0107467 filed with the Korean Intellectual Property Office on Aug. 24, 2017, the disclosure of which is incorporated herein by reference in its entirety. [0003] technical field [0004] The present invention relates to a method of manufacturing silica airgel mats and an apparatus for manufacturing the same. Background technique [0005] Airgel is a superporous, high specific surface area (≥ ≥ 500m 2 / g), with a porosity of about 90%-99.9% and a pore size of 1-100 nm, is an excellent material for ultra-lightweight, ultra-thermal insulation, ultra-low dielectric, etc. Therefore, the development of airgel materials has been actively researched and explored as transparent insulating materials, environmentally friendly high-temperature insulating materials, ultra-low dielectric films for highly integrated devices, catalysts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158B01J8/00
CPCC01P2006/17C01P2004/03C01P2004/02C01P2006/11C01P2006/40B01J19/22C01B33/1585B01J8/0015B01J8/008B05D1/18C01B33/146C01B33/152B05C3/00
Inventor 闵庚锡李悌均
Owner LG CHEM LTD
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