Method for preparing hydrophobic silicon dioxide aerogel felt under normal pressure

A technology of hydrophobic silica and airgel felt, which is applied to ceramic products, household utensils, and other household utensils. It can solve the problems of uneven hydrophobization of the gel, increased production costs, and long reaction cycles. Large-scale continuous production, elimination of dead ends, and easy operation

Active Publication Date: 2022-07-15
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain a hydrophobized silica airgel felt, it involves multiple solvent replacements in actual production, the reaction cycle is long, and the production co

Method used

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  • Method for preparing hydrophobic silicon dioxide aerogel felt under normal pressure
  • Method for preparing hydrophobic silicon dioxide aerogel felt under normal pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] refer to figure 1, a method for preparing hydrophobic silica aerogel felt at normal pressure, using a device for preparing hydrophobic aerogel at normal pressure, the device comprises: a nitrogen generator 1, a nitrogen heater 2, and a hydrophobizing reagent replenishing tank 3 , reagent tank 4, hydrophobic drying box 5, solvent recovery device 6 and solvent tank 7 and other preparation components, the preparation components are connected by a plurality of pipelines that play a communication role and valves arranged on the pipelines, and the valves can control the connected pipelines. Whether the connection between the preparation components at both ends is not.

[0034] Each hydrophobic drying box 5 includes two inlets and one outlet, and its outer wall is wrapped with a thermal insulation layer with thermal insulation effect. The thermal insulation layer can be made of aerogel felt, aerogel composite board, and foam composite board One or more of the thermal insulati...

Embodiment 2

[0046] The preparation parts and the connection relationship are the same as those in Example 1. A method for preparing hydrophobic silica aerogel felt at normal pressure, by nitrogen generator 1, nitrogen heater 2, hydrophobizing reagent replenishing tank 3, reagent tank 4, hydrophobic drying box 5, solvent recovery device 6 and solvent tank 7 and other preparation equipment are prepared, and the preparation steps are as follows:

[0047] (1), take silicon source, ethanol and water and mix evenly, then add catalyst and stir evenly to obtain silica sol; wherein, in terms of molar ratio, it is obtained by mixing silicon source:ethanol:water=1:6:2; The source is ethyl orthosilicate and methyl orthosilicate, and the catalyst is ammonium fluoride solution;

[0048] (2) After immersing the fiber mat in the silica sol obtained in step (1) for 12 hours, static aging at 60°C for 8 hours;

[0049] (3), place the silica wet gel felt obtained in step (2) in the hydrophobic drying box 5...

Embodiment 3

[0054] refer to figure 2 , a method for preparing hydrophobic silica aerogel felt at normal pressure, prepared by a device for preparing hydrophobic aerogel at normal pressure, the device comprising: a nitrogen generator 1, a nitrogen heater 2, a hydrophobizing reagent replenishing tank 3. Reagent tank 4, hydrophobic drying box 5, solvent recovery device 6, solvent tank 7, several pipes and valves.

[0055] The difference from Example 1 is that the nitrogen heater 2 transports nitrogen to the inlet of the hydrophobic drying box 5 and the reagent tank 4 through two pipelines and valves arranged on the pipelines, respectively.

[0056] The working process is as follows: Nitrogen is prepared by the nitrogen generator 1. First, the nitrogen heater 2 is not turned on, the valve on the pipeline between the nitrogen heater 2 and the reagent tank 4 is closed, and the connection between the nitrogen heater 2 and the hydrophobic drying box 5 is maintained. To ensure the smooth flow of...

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Abstract

According to the method for preparing the hydrophobic silicon dioxide aerogel felt under the normal pressure, a liquid-phase hydrophobization reagent is promoted to be converted into a gas-phase hydrophobization reagent through preheated nitrogen, and the circulated preheated nitrogen and the gas-phase hydrophobization reagent can bring out an organic solvent in wet gel during hydrophobization treatment; and dewatering and drying treatment on the wet gel felt is realized. According to the preparation method, the preparation period of conventional hydrophobic aerogel can be obviously shortened, the production cost can be reduced, meanwhile, replacement of a large amount of solvent after a traditional hydrophobization reaction is completed can be avoided, the whole preparation process is simple in technology, the aerogel drying process and aerogel hydrophobization treatment are carried out at the same time, operation is easy, and economical and environment-friendly effects are achieved.

Description

technical field [0001] The invention belongs to the technical field of aerogel preparation, in particular to a method for preparing a hydrophobic silica aerogel felt under normal pressure. Background technique [0002] Aerogel is a kind of gel material whose dispersion medium is gas, the interior is a highly cross-linked continuous three-dimensional network nano-hollow structure, and has a large specific surface area (500-1300m2). 2 / g), low density (30-150Kg / m 3 ), high porosity (85%-99%), small average pore size (2-50nm), and lower thermal conductivity (0.01-0.02W / m·K) than room temperature air. Lowest rate of solid material. Among them, silica aerogel and its felt have unique physical and chemical properties, and have achieved extensive research and application in aerospace, chemical industry, energy-saving buildings, thermal insulation, catalyst carriers, optics, acoustics, etc. [0003] The existing technology for preparing the silica aerogel felt is mainly divided i...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B38/00C04B41/64
CPCC04B30/02C04B41/64C04B41/4922C04B14/064C04B14/42C04B14/46C04B16/0675C04B14/386C04B14/48C04B38/0045C04B41/4578C04B41/4535
Inventor 张继承张东生刘喜宗姚栋嘉潘广镇陈帅
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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