Preparation method of resorcinol-formaldehyde/silicon dioxide aerogel

A technology of resorcinol and silica, applied in the field of aerogel preparation, can solve the problems of inability to control the composition structure of sol polymer, loss of independence of hybrid aerogel, difficulty in maintaining component properties, etc. The effect of shortened preparation time, easy control and cost reduction

Active Publication Date: 2015-12-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of direct mixing of raw materials in the current one-step method for preparing organic / inorganic aerogels, which cannot control the composition and structure of the polymer formed by the sol, loses the independence of each component of the hybrid airgel, and is difficult to maintain the composition properties, but the two-step process is complicated, requires more catalysts, and the technical problems of sol-gel time are longer, and a preparation method of resorcinol-formaldehyde / silica airgel is provided

Method used

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  • Preparation method of resorcinol-formaldehyde/silicon dioxide aerogel
  • Preparation method of resorcinol-formaldehyde/silicon dioxide aerogel
  • Preparation method of resorcinol-formaldehyde/silicon dioxide aerogel

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specific Embodiment approach 1

[0018] Embodiment 1: This embodiment is a preparation method of resorcinol-formaldehyde / silica airgel, which is specifically carried out in the following steps:

[0019] 1. Preparation of resorcinol-formaldehyde sol "glue core":

[0020] Dissolve resorcinol in absolute ethanol, then add formaldehyde aqueous solution and deionized water with a mass fraction of 37% to 40% in sequence, and finally add a catalyst, and stir magnetically for 30 minutes at a temperature of 20°C to 30°C. 60min, obtain resorcinol-formaldehyde sol; Described resorcinol and mass fraction are that the mol ratio of the formaldehyde in the formaldehyde aqueous solution of 37%~40% is 1:2; Described resorcinol and no The mol ratio of water ethanol is 1:30; The mol ratio of described resorcinol and catalyst is 1:(0.01~0.05); The mol ratio of described resorcinol and deionized water is 1:(1.25 ~5); Described catalyst is NaCO 3 Or the mass fraction is 2% HCl aqueous solution;

[0021] Two, prepare the mixed s...

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the molar ratio of resorcinol and catalyst described in step one is 1:0.04. Others are the same as the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the molar ratio of resorcinol and deionized water in Step 1 is 1:3. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to an aerogel preparation method, and discloses a preparation method of resorcinol-formaldehyde/silicon dioxide aerogel. The preparation method is used for solving problems of conventional one-step sol method used for aerogel hybridization that the composition structure of a polymer prepared from sol can not be controlled, independence of hybridized aerogel components is lost, component performance is difficult to maintain. Two-step sol method is complicated, many catalysts are needed, and sol-gel time is relatively long. The preparation method comprises following step: 1, resorcinol-formaldehyde sol colloidal nucleuses are prepared; 2, a mixed soil precursor of the resorcinol-formaldehyde/silicon dioxide aerogel is prepared; and 3, the resorcinol-formaldehyde/silicon dioxide aerogel is prepared. Compared with the prior art, the preparation method is simple, and is convenient to control; the amount of needed catalyst is small; preparation time is shortened; sample strength is increased; cost is reduced; the preparation method is convenient for large-scale and industrialized production, and possesses significant importance on promotion of applications of hybridized aerogel.

Description

technical field [0001] The invention relates to a preparation method of airgel. Background technique [0002] Airgel is a new type of nanoscale porous solid material with a continuous three-dimensional network structure. It is composed of continuous solid skeleton and connected nanopores. The porosity is as high as 80% to 99.8%, and the solid content is very small. Therefore, airgel Has a low density (3kg / m 3 ~600kg / m 3 ), high specific surface area (300kg / m 3 ~1200m 2 / g), is the condensed material with the smallest apparent density at present, known as "solid smoke" or "solid air". The unique nanopore structure of airgel makes it have excellent performance, such as the pore size of airgel is smaller than the mean free path of air molecules, so there is no air convection in the pores of airgel, and the porosity of airgel is as high as 80%. ~99.8%, the volume ratio of solids is extremely low, making aerogel the solid material with the lowest thermal conductivity in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/22C08G77/26C08K3/36C08J3/075
Inventor 何飞李亚骆金李明伟赫晓东
Owner HARBIN INST OF TECH
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