Lightweight melamine aerogel felt and preparation method thereof

A technology for melamine and aerogel felt, applied in the field of lightweight melamine aerogel felt and its preparation, can solve the problems of difficulty in transportation, operation and installation, difficulty in maintaining the inherent shape, poor mechanical stability, etc. Good mechanical stability and flame retardant properties

Inactive Publication Date: 2016-08-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the existing airgel which is difficult to maintain its inherent shape, has poor mechanical stability, and is difficult to transport, operate and install, and overcomes the uneven surface, rough processing and large capacity of the existing airgel felt with glass fiber as the carrier. etc., provide a kind of airgel blanket and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of lightweight melamine airgel felt and preparation method thereof, it is characterized in that the airgel felt is made of SiO with a volume ratio of 99.4% 2 Composed of airgel and 0.6% melamine foam, the melamine foam is an open-cell foam, and the bulk density of the foam is 4Kg / m 3 , where SiO 2 The airgel runs through the pores of the melamine foam to form a staggered three-dimensional network structure with flocculent gel; the preparation method of the airgel felt comprises the steps in the following order:

[0016] (1) Ethyl orthosilicate, absolute ethanol, oxalic acid, and deionized water in a molar ratio of 1:5:0.0007:0.5 were mixed at a temperature of 30°C and fully stirred, and hydrolyzed for 0.5 hours to obtain a silica sol system;

[0017] (2) Put the cut melamine foam into a mold cavity with the same size, pour the silica sol system obtained in step (1) into the mold cavity, immerse the melamine foam, add 0.4mol / L ammonia, N, N- SiO 2 Gel-foam comp...

Embodiment 2

[0021] A kind of lightweight melamine airgel felt and preparation method thereof, it is characterized in that the airgel felt is made of SiO with a volume ratio of 99.7% 2 Composed of airgel and 0.3% melamine foam, the melamine foam is an open-cell foam, and the bulk density of the foam is 10Kg / m 3 , where SiO 2 The airgel runs through the pores of the melamine foam to form a staggered three-dimensional network structure with flocculent gel; the preparation method of the airgel felt comprises the steps in the following order:

[0022] (1) Ethyl orthosilicate, absolute ethanol, oxalic acid, and deionized water in a molar ratio of 1:8:0.001:2 were mixed at a temperature of 80°C and fully stirred, and hydrolyzed for 2.5 hours to obtain a silica sol system;

[0023] (2) Put the trimmed melamine foam into a mold cavity with the same size, pour the silica sol system obtained in step (1) into the mold cavity, immerse the melamine foam, add 1.2mol / L of ammonia, N, N- SiO 2 Gel-foam...

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Abstract

The invention provides a lightweight melamine aerogel felt and a preparation method thereof. The lightweight melamine aerogel felt is characterized by comprising, by volume, 99.4 to 99.7% of SiO2 aerogel and 0.3 to 0.6% of melamine foam, wherein the melamine foam is open-cell foam, the unit weight of the foam is 4 to 10 Kg / m<3>, and the SiO2 aerogel penetrates an interlaced three-dimensional network structure formed by pores of the melamine foam in the form of flocculent gel. The preparation method for the aerogel felt comprises the following successive steps: (1) preparing a silica sol system; (2) putting the melamine foam into a die, casting the silica sol system and then carrying out standing and aging; and (3) successively carrying out cleaning and displacement, drying and heat treatment so as to obtain the melamine aerogel felt. The aerogel felt has a light weight, good mechanical stability, a regular shape and a smooth surface and is easy to process.

Description

technical field [0001] The invention relates to a preparation method of an airgel felt, in particular to a light melamine airgel felt and a preparation method thereof. Background technique [0002] Airgel, as the world's lightest solid, has been selected into the Guinness Book of World Records. This new material has a density of only 3.55 kilograms per cubic meter, which is only 2.75 times the density of air; dry pine wood (500 kilograms per cubic meter) is 140 times denser. The substance looks like solidified smoke, but its composition is similar to glass. Airgel looks "weak", but it is actually very strong and durable. It can withstand a pressure equivalent to thousands of times its own mass, and will not melt until the temperature reaches 1200 degrees Celsius. In addition, it has low thermal conductivity and low refractive index, and its insulating ability is 39 times stronger than the best fiberglass. Because of these characteristics, aerogel has become an irreplacea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B30/00
CPCC04B38/08C04B30/00C04B14/064
Inventor 陈照峰王伟伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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