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A kind of organic/inorganic phenolic resin hybrid aerogel and preparation method thereof

A phenolic resin and aerogel technology, which is applied in the fields of organic/inorganic phenolic resin hybrid aerogel and its preparation, porous hybrid phenolic resin aerogel and its preparation field, can solve the problem of anti-oxidation and anti-oxidation of heat-proof composite materials. Insufficient scouring ability, reducing the weight of aircraft heat-resistant materials, poor skeleton strength, etc., to achieve the effects of good thermal insulation efficiency, good oxidation resistance, and high carbonized structure strength

Active Publication Date: 2017-12-22
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

RF organic airgel has certain toughness and strength, which overcomes the disadvantages of brittleness and poor skeleton strength of inorganic aerogel, and the anti-insulation composite material prepared by using this as filling resin has a low density, which can greatly reduce the aircraft's air resistance. The weight of thermal materials, but the light weight and high porosity characteristics make the thermal protection composite materials insufficient in oxidation resistance and erosion resistance

Method used

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  • A kind of organic/inorganic phenolic resin hybrid aerogel and preparation method thereof
  • A kind of organic/inorganic phenolic resin hybrid aerogel and preparation method thereof
  • A kind of organic/inorganic phenolic resin hybrid aerogel and preparation method thereof

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preparation example Construction

[0042] A kind of preparation method of organic / inorganic phenolic resin hybrid airgel, the steps are:

[0043] (1) prepare silica sol, the mass concentration of solute in the prepared silica sol is 10%-40%;

[0044] (2) prepare phenolic resin sol, the mass concentration of solute in the prepared phenolic resin sol is 10%-50%;

[0045] (3) Add the silica sol prepared in step (1) to the phenolic resin sol prepared in step (2), then add a weak base catalyst or curing agent, and stir at room temperature for 10-60 minutes until a clear and transparent solution is obtained;

[0046](4) Seal the clear and transparent solution obtained in step (3), then carry out a sol-gel (co-gel) chemical reaction at a temperature of 60-150° C. for 4-120 hours, and dry the product after the reaction is completed to obtain organic / Inorganic phenolic resin hybrid airgel.

[0047] In the described step (1), the method for preparing silica sol is: hydrolyzing tetraethyl orthosilicate solution, tetra...

Embodiment 1

[0073] Embodiment 1 (blank control example, the preparation of pure phenolic resin airgel and lightweight anti-heat insulation composite material):

[0074] Weigh 500g of novolak resin and dissolve it in 2286g of ethanol solvent, add 71.43g of HTMA, stir and mix until it dissolves evenly, pour it into a molding mold, seal it and cure it at 120°C for 6 hours. After the reaction was completed, the wet gel was taken out, left to air at room temperature for one day, and then dried in an oven at 50°C under normal pressure for 2 days to obtain a dry pure phenolic resin airgel. The microscopic morphology of the obtained pure phenolic resin airgel is as follows figure 1 shown by figure 1 It can be seen that the phenolic resin airgel presents a porous morphology.

Embodiment 2

[0076] Weigh 3.95g TEOS and add it to 15.80g ethanol solvent, then add 0.6826g of 0.1mol / L dilute nitric acid, stir at room temperature, and hydrolyze for 30min to prepare a silica sol with a mass fraction of 20% for later use. Weigh 15.25g of novolac resin and 1.92g of hexamethylenetetramine catalyst, pour it into a container, weigh 4.00g of TEOS solution with a mass fraction of 20%, add it to the phenolic resin, and then add 57.60g of ethanol solvent to keep The mass fraction of the novolak resin is 20%, sealed, and cured at 120° C. for 5 hours. After the reaction was completed, the wet gel was taken out, dried at room temperature for 1 day, and then dried in an oven at 50°C for 20 hours to obtain SiO 2 The hybrid airgel with a mass content of 5%, the microscopic morphology of the obtained hybrid airgel is as follows figure 2 shown by figure 2 It can be seen that the hybrid airgel still presents a porous morphology.

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Abstract

The invention relates to organic / inorganic phenolic resin hybrid aerogel and a preparation method thereof, in particular to porous hybrid phenolic resin aerogel and a preparation method thereof, and is mainly applied to the technical field of light heat shielding / insulation heat protection systems. The hybrid aerogel takes cheap and available commercial phenolic resin and tetraethl orthosilicate as raw materials, and the organic / inorganic phenolic resin hybrid aerogel can be obtained through a mild reaction route and an ambient pressure drying method; the hybrid aerogel is good in high temperature resistance and oxidation resistance and high in carbonated structural strength; the hybrid aerogel is good in heat insulation efficiency, low in heat conductivity and good in high-temperature scour resistance; the hybrid aerogel has a great application value in the field of advanced heat protection materials.

Description

technical field [0001] The present invention relates to an organic / inorganic phenolic resin hybrid airgel and a preparation method thereof, in particular to a porous hybrid phenolic resin airgel and a preparation method thereof, which are mainly used in light heat-proof / heat-insulating thermal protection systems technology field. Background technique [0002] At present, with the diversified development of manned spaceflight, deep space exploration, and hypersonic vehicles, there is a higher demand for thermal protection materials for reentry vehicles, which not only requires the structure of the thermal protection system to be simplified and lightweight, It is also required to be multi-functional, that is, to have the function of heat insulation while realizing heat protection. As an ablative resin matrix, organic airgel just meets the needs of heat protection / heat insulation. It has been applied in advanced heat protection materials (such as PICA and SIRCA materials). In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/06C08K3/36C08J9/00
CPCC08J9/0066C08J2205/026C08J2361/06C08K3/36C08L2201/08C08L61/06
Inventor 师建军冯志海左小彪孔磊余瑞莲严蛟
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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