Melamine foam reinforced silicon dioxide aerogel composite material and application thereof

A technology of silica and composite materials, applied in the direction of silicon compounds, inorganic chemistry, electrical components, etc., can solve the problems of large volume, achieve the effect of small density, uniform gap size, and inhibit the growth of coagulated particles

Active Publication Date: 2021-06-01
峰特(浙江)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a melamine foam reinforced silica airgel composite material and its application, which solves the problem that the existing silica airgel felt has a relatively high bulk density. big problem

Method used

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  • Melamine foam reinforced silicon dioxide aerogel composite material and application thereof
  • Melamine foam reinforced silicon dioxide aerogel composite material and application thereof
  • Melamine foam reinforced silicon dioxide aerogel composite material and application thereof

Examples

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preparation example Construction

[0037] The present embodiment provides a kind of melamine foam reinforced silica airgel composite material, is to be 93% SiO by weight percentage 2 Airgel and 7% melamine foam are made, and the preparation method specifically includes the following steps:

[0038] (1) Take methyltrimethoxysilane, sodium citrate, absolute ethanol and deionized water, add hydrochloric acid alcohol solution, adjust the pH value of the solution to 2.5, stir vigorously at room temperature and carry out hydrolysis reaction for 5 hours to obtain a silica sol system; The molar ratio of methyltrimethoxysilane, sodium citrate, absolute ethanol and deionized water is 1:0.8:15:10:0.010;

[0039] (2) Add mannitol into the silica sol system, stir evenly, then add ammonia water alcohol solution to adjust the pH to 8.0, stir to make the solution fully mixed, stop stirring after 5 minutes, pour into a mold with melamine foam, and immerse in melamine Foam, under airtight conditions at 50°C, aged for 30 hours t...

Embodiment 6

[0072] This embodiment provides that this embodiment provides a melamine foam reinforced silica airgel composite material, which is made of 93% SiO by weight percentage 2 Airgel and 7% melamine foam are made, and the preparation method of this embodiment is the same as that of Example 1 except that sodium citrate is not added in step (1).

[0073] Performance test result (test method is identical with embodiment 1): specific surface area 453.9m 2 / g, porosity 89.6%, density 9.9mg / cm 3 , The thermal conductivity is 22.35mw / mk, and the compressive strength is about 0.36MPa (25% deformation).

Embodiment 7

[0075] The present embodiment provides a kind of melamine foam reinforced silica airgel composite material, is to be 93% SiO by weight percentage 2 Airgel and 7% melamine foam, the preparation method of this example is the same as Example 1 except that no propylene glycol is added in step (2).

[0076] Performance test result (test method is identical with embodiment 1): specific surface area 455.1m 2 / g, porosity 90.1%, density 9.8mg / cm 3 , The thermal conductivity is 22.21mw / mk, and the compressive strength is about 0.37MPa (25% deformation).

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Abstract

The invention provides a melamine foam reinforced silicon dioxide aerogel composite material and application thereof. The melamine foam reinforced silicon dioxide aerogel composite material is prepared from, by weight, 90%-95% of SiO2 aerogel and 5%-10% of melamine foamate. The preparation method specifically comprises the following steps: methyltrimethoxysilane, sodium citrate, absolute ethyl alcohol and deionized water are taken, a hydrochloric acid alcoholic solution is added, the pH value is adjusted, stirring is conducted, and the melamine foam reinforced silicon dioxide aerogel composite material is obtained; and carrying out hydrolysis reaction to obtain a silica sol system; adding mannitol into a silica sol system, uniformly stirring, adding an ammonia water alcohol solution to adjust the pH value, stirring to fully mix the solution, pouring into a mold filled with melamine foam, immersing the melamine foam, standing and aging to obtain SiO2 gel-foam composite foam; and carrying out solvent replacement and supercritical drying to obtain the product. According to the preparation method disclosed by the invention, the melamine foam fibers are directly infiltrated by the silica sol, and the silica sol and the melamine foam fibers are subjected to gel aging, modification and drying together to obtain the aerogel composite material, and the aerogel composite material has relatively low heat conductivity coefficient, relatively high mechanical stability and relatively good consistency of product quality.

Description

technical field [0001] The invention belongs to the technical field of airgel materials, in particular to a melamine foam reinforced silica airgel composite material and its application. Background technique [0002] Airgel is a special kind of nanoporous material with many excellent physical and chemical properties, such as: low density, high porosity, high specific surface area, adjustable surface chemical properties, etc. Due to the unique properties of airgel in physical, chemical and mechanical aspects, airgel is widely used in thermal insulation, catalysis, environmental purification, chemical sensors, acoustic sensors, energy storage equipment, waterproof coatings, inertial confinement fusion, high energy physics, It has been widely used in the fields of particle capture, biomedicine and food processing. [0003] Aerogels are mainly divided into inorganic aerogels, organic aerogels and carbon aerogels. Inorganic aerogels mainly include silica aerogels and metal oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B14/06C01B33/158H01M10/615H01M10/625H01M10/659
CPCC04B30/02C04B14/064C01B33/1585H01M10/615H01M10/625H01M10/659C04B2201/20C04B2201/32C04B2201/50C04B16/0691Y02E60/10
Inventor 樊雪子李洋洋
Owner 峰特(浙江)新材料有限公司
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