Manufacturing method for silica aerogel blanket and manufacturing apparatus therefor

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 ...

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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

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