A kind of ultra-high transparency and ultra-low haze lightweight silica airgel and its preparation method and application

A light-weight silica and transparency technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of not paying enough attention to the light transmission of airgel, achieve precise control of the reaction environment, and avoid heavy Poor performance and stability, small size effect

Active Publication Date: 2022-06-24
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, as early as 1968, Teichner discovered that silica aerogels prepared by methyl orthosilicate had a certain light transmittance, but did not pay enough attention to the light transmittance of airgel in the early stage

Method used

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  • A kind of ultra-high transparency and ultra-low haze lightweight silica airgel and its preparation method and application
  • A kind of ultra-high transparency and ultra-low haze lightweight silica airgel and its preparation method and application
  • A kind of ultra-high transparency and ultra-low haze lightweight silica airgel and its preparation method and application

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preparation example Construction

[0033] The present invention provides, in a first aspect, a method for preparing a lightweight silica aerogel with ultra-high transparency and ultra-low haze, the method comprising the steps of:

[0034] (1) Provide a microreactor device (also referred to as a microfluidic droplet microreactor device): the microreactor device includes a PDMS microfluidic chip and an ITO electrode connected to the PDMS microfluidic chip; The PDMS microfluidic chip includes a first area, a second area, a third area, a fourth area and a fifth area that are connected in sequence, and the ITO electrode is connected to the fourth area of ​​the PDMS microfluidic chip; In the present invention, according to the flow direction of the silicon source precursor (also referred to as the silicon source precursor phase) and the fluorocarbon oil (also referred to as the fluorocarbon oil phase), the first area, the second area, the third area, the The fourth area and the fifth area, in the present invention, t...

Embodiment 1

[0065] ①Provide a micro-reactor device; weigh 15.2g (0.1mol) of methyl orthosilicate, 7.2g (0.4mol) of water and 64g (2mol) of methanol, mix them uniformly as the silicon source precursor phase, and use a syringe to extract the silicon source precursor The material phase is 10 mL, and the silicon source precursor phase is introduced through the injection side channel at the inlet of the silicon source precursor in the microreactor device. Use a syringe to extract 50 mL of perfluorocarbon oil (fluorocarbon oil) as the oil phase, and introduce the perfluorocarbon oil through the injection side channel at the inlet of the fluorocarbon oil in the microreactor device. Use a syringe to extract 5 mL of dilute hydrochloric acid (catalyst) with a concentration of 0.1 mol / L, and introduce the dilute hydrochloric acid through the injection side channel at the catalyst inlet in the microreactor device.

[0066] ②The first area of ​​the PDMS microfluidic chip included in the microreactor d...

Embodiment 2

[0075] Embodiment 2 is basically the same as Embodiment 1, except that:

[0076] In step ①, weigh 15.2 g (0.1 mol) of methyl orthosilicate, 3.6 g (0.2 mol) of water and 38.4 g (1.2 mol) of methanol (the molar ratio of silicon source, water and methanol is 1:2:12). ), mixed uniformly as the silicon source precursor phase.

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Abstract

The invention relates to a lightweight silicon dioxide aerogel with ultra-high transparency and ultra-low haze, a preparation method and application thereof. The method: prepare a microreactor; prepare ultra-small silica sol in the microreactor by adjusting the flow rate of the silicon source precursor, fluorocarbon oil, catalyst phase, and pipeline reaction temperature; disperse the droplets containing the silica sol and the oil The mixture of phases is rapidly stirred, statically layered, and quickly frozen to separate the silica sol phase; a gel accelerator is added to the silica sol to obtain a wet gel, and ultra-high transparency is obtained after aging, solvent replacement, and supercritical drying and ultra-low haze lightweight silica airgel. The nanoparticle size of the material prepared by the present invention can be adjusted from 5 to 10 nm, the light transmittance can reach up to 94.2%, and the haze can reach as low as 4.7%, showing ultra-high transparent quality. It has a wide range of applications in heat collection systems, Cherenkov detectors, and high-speed particle capture in deep space.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and relates to a preparation method of silica aerogel, in particular to a lightweight silica aerogel with ultra-high transparency and ultra-low haze, and a preparation method and application thereof. Background technique [0002] Aerogel, a material with a three-dimensional nanoporous structure, is generally recognized as a very good thermal insulation material, and has been widely used in the field of thermal insulation requirements. In addition, as early as 1968, Teichner found that the silica aerogel prepared by methyl orthosilicate has a certain light transmittance, but did not pay enough attention to the light transmittance of aerogel in the early stage. The rapid development of aerogel field in the past 50 years, as well as the current severe global climate problems and the urgent situation of energy conservation and emission reduction, have made scientists pay more and more at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/148C01B33/145
CPCC01B33/148C01B33/145C01P2004/03C01P2004/04C01P2006/60C01P2006/32C01P2006/10
Inventor 张晚林刘圆圆雷朝帅张恩爽戴晶鑫李文静张凡赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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