Aerogel composite and preparation method thereof

A composite material and airgel technology, which is applied in the field of thermal insulation, light weight, and sound insulation materials, can solve the problems of high brittleness, easy powder dropping on the surface of airgel felt, and low surface bonding strength.

CN107266116AActive Publication Date: 2017-10-20NANJING WEICAI NEW ENERGY TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-10-20

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Abstract

The invention discloses an aerogel composite and a preparation method thereof. The aerogel composite is characterized by mainly being prepared from aerogel powder, fiber felt and a water-based adhesive, wherein the aerogel powder contains an internal hydrophobic layer and a surface hydrophilic layer, and the surface hydrophilic layer is 0.1-100 mu m thick. The preparation method of the aerogel composite comprises the following steps: (1) modifying the aerogel powder; (2) mixing the aerogel powder in the step (1) with the water-based adhesive; (3) infiltrating the wet mixture in the step (2) to the fiber felt; (4) performing hot-press forming. The aerogel powder of the aerogel composite is of a nano-porous structure, so that the aerogel composite has excellent thermal insulation and mechanical properties and huge market application prospect.
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Description

technical field

[0001] The invention relates to a thermal insulation material, in particular to an airgel composite material and a preparation method thereof, and belongs to the fields of light weight, thermal insulation, sound insulation materials and the like. Background technique

[0002] Airgel material is a kind of lightweight solid material with nanoscale pores accumulated by nanoscale particles. It has extremely high porosity, specific surface area, extremely low density and solid content, chemical inertness and non-flammability. It exhibits excellent light weight, thermal insulation, fire prevention, sound insulation, shock absorption and energy absorption characteristics, and can be widely used in military fields such as national defense and military industry, security and anti-terrorism, as well as civilian fields such as green buildings, heat transmission, public transportation, and financial equipment protection.

[0003] However, because of the inherent defects ...

Examples

preparation example Construction

[0033] A preparation method of an airgel composite material, comprising the following steps:

[0034] (1) Airgel powder modification;

[0035] (2) mixing the airgel powder in step (1) with the water-based adhesive;

[0036] (3) Soaking the wet mixture in step (2) onto the fiber mat;

[0037] (4) Thermoforming.

[0038] In addition, the mass ratio of airgel powder to water-based adhesive in step (2) can be 1:(1~50); the infiltration in step (3) can be soaking the fiber mat in the wet mixture, or under pressure or negative Under the condition of high pressure, the wet mixture is evenly filled in the gaps between the fiber mats.

[0039] In this way, the preparation method of the airgel composite material of the present invention is simple in process, practical, low in price and suitable for industrial production.

[0040] In this embodiment, the step (1) includes a hydrophobic modification step; the hydrophobic modification is to perform hydrophobic modification on the airgel ...

Embodiment 1

[0052] SiO was prepared using the following steps 2 Airgel felt:

[0053] (1) Detection of SiO to be treated using a contact angle meter 2 The contact angle between the surface of the airgel powder and water, the test result is 55°, and then SiO with a particle size of 56 μm 2 The airgel powder is placed in a vacuum heating furnace, and the weighed hexamethyldisilazane is placed in a vacuum heating furnace with a container, heated and vaporized, and hydrophobically modified for 1.5 hours to obtain hydrophobic SiO 2 Airgel powder, detection of hydrophobic SiO by contact angle meter 2 The contact angle between the surface of the airgel powder and water is 147°;

[0054] (2) At room temperature, weigh glycerin, n-hexane and deionized water at a mass ratio of 1:0.5:120, mix them evenly, and prepare a surface hydrophilic modification solution;

[0055] (3) According to hydrophobic SiO 2 The volume ratio of the airgel powder and the surface hydrophilic modification solution is ...

Embodiment 2

[0063] SiO was prepared using the following steps 2 Airgel felt:

[0064] (1) Use a contact angle meter to detect SiO to be used 2 The contact angle between the surface of the airgel and water, the test result is 126°, then the SiO 2 Airgel is hydrophobic;

[0065] (2) At room temperature, weigh n-hexane, isopropanol and deionized water at a mass ratio of 1:0.5:800, mix them evenly, and prepare a surface hydrophilic modification solution;

[0066] (3) According to hydrophobic SiO 2 The volume ratio of the airgel powder and the surface hydrophilic modification solution is 1:3, weigh the surface modification solution, and pour it into the corresponding container, and put the hydrophobic SiO 2 The airgel powder is put into a container made of filter mesh, immersed in the surface hydrophilic modification solution together, and taken out after 1 min;

[0067] (4) The surface of SiO obtained in step (3) containing the hydrophilic modification solution 2 The airgel sheet is pla...