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Method for preparing fiber toughness SiO2 aerogel composite material in normal pressure drying condition

A technology of atmospheric drying and composite materials, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problem of excessive equipment conditions, and achieve the effect of reducing production cost, complete block and improving safety.

Inactive Publication Date: 2011-04-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for preparing fiber tough SiO by normal pressure drying 2 Airgel composite method to solve supercritical drying method to prepare large-scale fiber-strong and tough SiO 2 Airgel has too high requirements on equipment conditions

Method used

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  • Method for preparing fiber toughness SiO2 aerogel composite material in normal pressure drying condition
  • Method for preparing fiber toughness SiO2 aerogel composite material in normal pressure drying condition

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specific Embodiment approach 1

[0009] Specific implementation mode 1: In this implementation mode, dry under normal pressure to prepare fiber tough SiO 2 The method of airgel composite material is to carry out as follows: one, carry out hydrolysis reaction 48h after mixing ethyl orthosilicate, dehydrated alcohol, oxalic acid and water, wherein the mol ratio of ethyl orthosilicate and water is 1:1, the molar ratio of ethyl orthosilicate to absolute ethanol is 1:7, the molar ratio of ethyl orthosilicate to oxalic acid is 1:9×10 -4 2. Add water, N, N-dimethylformamide and ammonia water, inject the fiber mat until the fiber mat is submerged, and leave it for 24-48 hours to obtain a fiber mat-reinforced gel composite; 3. Step 2 The prepared fiber mat-reinforced gel composite is placed in a drying oven at 20-60°C for 2-6 hours, then placed in an aqueous solution of 80% ethanol by volume, and aged at 40-60°C for 12-24 hours. Then place it in a mixture of tetraethyl orthosilicate and ethanol with a volume ratio of...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the fiber mat is short quartz fiber mat, continuous quartz fiber mat, high silica fiber mat or carbon fiber mat.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the drying temperature in Step 3 is 30-50°C. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

A method for preparing fiber toughness SiO2 aerogel composite material in normal pressure drying condition relates to a preparation method of fiber toughness SiO2 aerogel composite material. The method solves the problem that a supercritical drying method for preparing large-size fiber toughness SiO2 aerogel has over-high requirements on device conditions. The preparation method of fiber toughness composite material comprises the following steps: obtaining fiber toughness SiO2 aerogel composite material after sol-gel, ageing, solvent displacement, surface decoration, washing and drying processing. The method is characterized by low production cost, low requirements on device and good safety. The fiber toughness SiO2 aerogel composite material prepared by the method can be made into flexible and rigid composite material according to the form and characteristics of a fiber prefabricated part, has complete block and low thermal conductivity, and is hydrophobing. The fiber toughness SiO2 aerogel composite material has wide application prospect in the heat preservation and insulation field.

Description

technical field [0001] The invention relates to a fiber tough SiO 2 Preparation method of airgel composite material. Background technique [0002] Existing fiber tough SiO 2 Airgel composite materials are prepared by supercritical drying method, the equipment system is complex and expensive, and it needs to work under high temperature and high pressure, which is highly dangerous. In addition, this method is useful in the preparation of large-scale fiber-strength SiO 2 In terms of airgel composite materials, the requirements for high temperature and high pressure equipment are more stringent, so the application is greatly restricted. Contents of the invention [0003] The invention provides a method for preparing fiber tough SiO by normal pressure drying 2 Airgel composite method to solve supercritical drying method to prepare large-scale fiber-strong and tough SiO 2 Airgel has a problem with high requirements on equipment conditions. [0004] Fabrication of fiber-str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/14
Inventor 贾德昌左军超段小明杨治华周玉
Owner HARBIN INST OF TECH
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