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Thermal insulation silicon dioxide aerogel/hydroxylation glass fiber felt composite and preparation method thereof

A technology of glass fiber mat and silica, which is applied in the field of airgel composite material preparation, can solve the problems of relatively high cost, difficult strength, and high airgel strength, and achieve good product performance stability, process safety and controllability, The effect of excellent comprehensive performance

Inactive Publication Date: 2015-12-30
四川中蓝基业新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN1592651A provides a method for preparing an airgel thermal insulation composite material. The airgel composite material prepared by this process has good performance and relatively high cost. The supercritical drying process is mainly used, which has certain risks in industrial production. Not conducive to large-scale industrial production
[0007] Chinese patent CN103342537A provides a method for preparing high-temperature-resistant alumina airgel materials. The airgel prepared by this process has high strength and large blocks, showing a great market development prospect, but because supercritical equipment is required, At the same time, it needs to be processed under high temperature and high pressure. Therefore, there are still certain limitations for commercial production.
[0008] Chinese patent CN102351506A provides a method for preparing a bulk high-temperature-resistant silicon-carbon composite airgel material. The airgel has the disadvantages of poor high-temperature resistance and difficult molding strength. The prepared airgel can be grown at a temperature above 1000°C. Time use, with low density, large specific surface area, large pore volume, high strength, high temperature resistance
Not conducive to mass production

Method used

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  • Thermal insulation silicon dioxide aerogel/hydroxylation glass fiber felt composite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The starting material for the insulating silica airgel / hydroxylated glass fiber mat composite is made from the following components:

[0035] Silica airgel as the matrix, 50 parts

[0036] Hydroxylated glass fiber felt as reinforcement 70 parts.

[0037] The preparation method of thermal insulation silica airgel composite material comprises the following steps:

[0038] 1) Deionized water, absolute ethanol, and hexamethyldisiloxane by mass are: 18:230:0.8, at a temperature of 30°C, after adding 0.1 part of hydrolysis catalyst hydrochloric acid with a molar concentration of 0.5mol / L, Add 208 parts of ethyl orthosilicate dropwise and react for 0.5h to control the M group in the sol system as (CH3)3SiO 1 / 2 , the Q group is SiO 4 / 2 , the molar ratio of M and Q structure is 1:30, and after fully stirring for 2 hours, a silica sol system with MQ structure is obtained;

[0039] 2) Carry out hydroxylation treatment to the glass fiber mat, soak the glass fiber mat in acetone...

Embodiment 2

[0045] The starting material for the insulating silica airgel / hydroxylated glass fiber mat composite is made from the following components:

[0046] Silica airgel as the matrix, 80 parts

[0047] Hydroxylated glass fiber felt as reinforcement 120 parts.

[0048] The preparation method of thermal insulation silica airgel composite material comprises the following steps:

[0049] 1) Deionized water, absolute ethanol, and hexamethyldisiloxane are 36:460:2.4 by mass, and at a temperature of 78°C, add 0.3 parts of hydrolysis catalyst hydrofluoric acid with a molar concentration of 1mol / L Afterwards, 208 parts of tetraethyl orthosilicate was added dropwise and reacted for 2 hours to control the M group in the sol system as (CH3)3SiO 1 / 2 , the Q group is SiO 4 / 2 , the molar ratio of M and Q structure is 1:100, and after fully stirring for 10h, a silica sol system with MQ structure is obtained;

[0050] 2) Carry out hydroxylation treatment to the glass fiber mat, soak the glass fi...

Embodiment 3

[0056] The starting material for the insulating silica airgel / hydroxylated glass fiber mat composite is made from the following components:

[0057] Silica airgel as the matrix, 65 parts

[0058] Hydroxylated glass fiber felt as reinforcement 100 parts.

[0059] The preparation method of thermal insulation silica airgel composite material comprises the following steps:

[0060] 1) Deionized water, absolute ethanol, and hexamethyldisiloxane by mass are: 28:400:1.5, at a temperature of 55°C, after adding 0.2 parts of hydrolysis catalyst hydrochloric acid with a molar concentration of 0.75mol / L, Add 208 parts of tetraethyl orthosilicate dropwise and react for 1h to control the M group in the sol system as (CH3)3SiO 1 / 2 , the Q group is SiO 4 / 2 , the molar ratio of M and Q structure is 1:70, and after fully stirring for 5h, a silica sol system with MQ structure is obtained;

[0061] 2) Carry out hydroxylation treatment to the glass fiber mat, soak the glass fiber mat in 35% ac...

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Abstract

The invention discloses a thermal insulation silicon dioxide aerogel / hydroxylation glass fiber felt composite and a preparation method thereof. The thermal insulation silicon dioxide aerogel / hydroxylation glass fiber felt composite is characterized in that silicon dioxide aerogel accounts for 50-80 weight parts of a matrix, and hydroxylation glass fiber felt accounts for 70-120 weight parts of a reinforcing body. The thermal insulation silicon dioxide aerogel / hydroxylation glass fiber felt composite is prepared by preparing a silica sol system of an MQ structure (M represents (CH3)3SiO1 / 2, Q represents SiO4 / 2) through raw materials including absolute ethyl alcohol, deionized water, hexamethyldisiloxane and the like under the acid catalysis environment, then adding gel catalysts, submerging preprocessed glass fiber in the silica sol system to form a wet gel and fiber felt composite, conducting soaking through normal hexane after ageing is conducted for 12-24 h so that water in the system can be removed, and conducting drying to obtain the silicon dioxide aerogel / hydroxylation glass fiber felt composite at temperature of 50-120 DEG C and pressure of 0.01-5 Pa for 1-5 h.

Description

technical field [0001] The invention relates to a thermal insulation silica airgel / hydroxylated glass fiber mat composite material and a preparation method thereof, belonging to the technical field of airgel composite material preparation. technical background [0002] Silica airgel is an ultra-light porous material with high specific surface area, low density and three-dimensional nanoporous structure. It has unique optical, acoustic, electrical and thermal properties. It is used in aviation, aerospace, metallurgy, petrochemical and The field of energy-saving building materials has broad application prospects. [0003] At present, domestic and foreign scholars and enterprises have conducted extensive research on the preparation and application of aerogels. Silicon dioxide aerogels can be formed by using organic silicon as a silicon source, using a melting-gel process, and drying. However, due to the extremely low density (about 1 / 6 to 1 / 3 of the air density), the specific ...

Claims

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Application Information

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IPC IPC(8): C04B30/02
Inventor 侯仁义张灼燃产小华李逢政
Owner 四川中蓝基业新材料科技有限公司
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