A method of preparing a hydrophobic type silicon dioxide aerogel material and a method of preparing a VIP vacuum plate and powder

A silica and aerogel technology, applied in the direction of silica, silica, chemical instruments and methods, etc., can solve the problems of cumbersome solvent replacement, colloid collapse, and inability to prepare high-performance materials, etc., and achieve simple preparation process , Improve production efficiency, improve production efficiency and the effect of added value

Active Publication Date: 2017-07-14
江西宏柏新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Another objective is to solve the biggest problem and the most cumbersome solvent replacement problem in the preparation of airgel materials, and the present invention fundamentally solves the problem of solid-air interface during drying due to the presence of a large amount of high surface tension solvents in the colloid. The generated capillary force causes the colloid to collapse, making it impossible to prepare high-performance materials

Method used

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  • A method of preparing a hydrophobic type silicon dioxide aerogel material and a method of preparing a VIP vacuum plate and powder
  • A method of preparing a hydrophobic type silicon dioxide aerogel material and a method of preparing a VIP vacuum plate and powder
  • A method of preparing a hydrophobic type silicon dioxide aerogel material and a method of preparing a VIP vacuum plate and powder

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specific Embodiment approach 1

[0033] Specific implementation mode 1: In this implementation mode, a method of reverse extraction with organic solvents is used to prepare hydrophobic SiO 2 The method for airgel material, it is carried out according to the following steps:

[0034] 1. Preparation of gel precursor:

[0035] Mix the silicon source with 0.1-18mol / L acid solution at a molar ratio of 1:0.001-10, place it in an ultrasonic instrument or a microwave machine, and react at a temperature of 0-80°C for 1-60 minutes; Add ammonia water to the liquid, continue ultrasonication or microwave for 1-10 minutes at a temperature of 0-80°C to obtain a gel precursor; the concentration of the ammonia water is 0.5-10mol / L;

[0036] Wherein, the silicon source is methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, isobutyltrimethoxysilane, octyltrimethoxysilane, dimethyldimethoxysilane, Methyltriethoxysilane, Ethyltriethoxysilane, Propyltriethoxysilane, Isobutyltriethoxysilane, Octyltriethoxysilan...

specific Embodiment approach 2

[0044] Embodiment 2: This embodiment is different from Embodiment 1 in that the silicon source is a mixture of propyltrimethoxysilane and tetraethoxysilane in a molar ratio of 1:0.1-10. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0045] Embodiment 3: This embodiment is different from Embodiment 1 in that the silicon source is a mixture of propyltrimethoxysilane and tetraethoxysilane in a molar ratio of 1:0.2-10. Others are the same as in the first embodiment.

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Abstract

The invention provides a method of preparing a hydrophobic type silicon dioxide aerogel material and a method of preparing a VIP vacuum plate and powder, and relates to the field of aerogel materials. The methods overcome a problem that sol-gel preparing cycles are long and the most difficult problem that is tedious solvent displacement in aerogel material preparation. The method of preparing the hydrophobic type silicon dioxide aerosol material includes mixing a silicon source and an acid solution having a certain concentration to prepare a gel precursor, adding an organic extractant, and performing extraction to obtain the hydrophobic type SiO2 aerogel material. The methods are applied in the field of aerogel materials.

Description

technical field [0001] The invention belongs to the field of airgel materials, in particular to a method for preparing hydrophobic SiO by using an organic solvent reverse extraction method 2 The method of airgel material and the method of preparing VIP vacuum board and powder. Background technique [0002] Airgel is a typical nanoporous amorphous solid material with characteristics such as density, transparency and controllable structure, and is known as a miracle material that changes the world. In particular, its unique three-dimensional continuous nano-network pore structure makes it have many unique properties, and its porosity is as high as 80% to 99.8%. At present, the density of silica airgel is as low as 3mg / cm 3 , only three times heavier than air, known as "frozen blue smoke", it also has a super high specific surface area (300 ~ 1500m 2 / g) and extremely low thermal conductivity (0.004~0.02W / m.k), so it is widely used in the fields of heat insulation materials, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/159C01B33/158C01B33/16C04B30/02
CPCC01B33/1585C01B33/159C01B33/163C01P2002/80C01P2004/03C04B30/02
Inventor 纪冠承张磊杨春晖李洪宝
Owner 江西宏柏新材料股份有限公司
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