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Infrared shielding coating modified fiber reinforced aerogel thermal insulation material and preparation method thereof

A technology of modified fiber and heat insulation materials, which is applied in the field of infrared shielding coating modified fiber reinforced airgel heat insulation materials and its preparation, which can solve the problems of low thermal conductivity, poor ability of shielding agent to disperse and resist infrared radiation, and high strength. problem, to achieve low thermal conductivity, overcome poor ability to resist infrared radiation, and high strength

Active Publication Date: 2020-01-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The material has the characteristics of good infrared shielding performance, low thermal conductivity and high strength, and the ZrSiO 4 The coating is evenly attached to the surface of the fiber without affecting the pore structure of the porous fiber material, which effectively overcomes the current problems of uneven dispersion of shading agents and poor ability to resist infrared radiation. This material has potential application prospects in the field of high temperature insulation and energy saving

Method used

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  • Infrared shielding coating modified fiber reinforced aerogel thermal insulation material and preparation method thereof
  • Infrared shielding coating modified fiber reinforced aerogel thermal insulation material and preparation method thereof
  • Infrared shielding coating modified fiber reinforced aerogel thermal insulation material and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0038] (1) ZrOCl 2 ·8H 2 O. Tetraethyl orthosilicate, distilled water, ethanol, and hydrochloric acid are mixed uniformly according to the molar ratio of 1:1:8:16:0.02, stirred at 25°C for 1 hour, and fully hydrolyzed to obtain a silicon-zirconium sol; add concentration to the silicon-zirconium sol 1.0wt% tetrabutylammonium bromide and 0.3wt% lithium fluoride. After stirring for 1 hour, vacuumize the mixed silicon-zirconium sol and immerse it in quartz fiber felt. After suction filtration and drying at 60°C for 2 hours, press 2°C / min heating up to 900°C, holding for 1h and cooling to obtain ZrSiO 4 Coated modified quartz fiber felt;

[0039] (2) Mix and stir ethyl orthosilicate, distilled water, ethanol, and nitric acid at a molar ratio of 1:4:8:0.001 at 4°C for 0.5 h, and fully hydrolyze to obtain silica sol; according to ethyl orthosilicate and N, The molar ratio of N-dimethylformamide is 1:0.3. Add N,N-dimethylformamide to the composite silica sol and stir evenly;

[00...

example 2

[0043] (1) ZrOCl 2 ·8H 2 O. Tetraethyl orthosilicate, distilled water, ethanol, and nitric acid are mixed uniformly at a molar ratio of 1:1:16:32:0.10, stirred at 60°C for 2 hours, and fully hydrolyzed to obtain a silicon-zirconium sol; 6.0wt% hexadecyltrimethylammonium bromide and 0.5wt% lithium fluoride, after stirring for 2.0h, vacuumize the mixed silicon-zirconium sol into the mullite fiber felt, and filter it in After drying at 80°C for 5 hours, heat up to 1000°C at 5°C / min, hold for 2 hours and cool to obtain ZrSiO 4 Coating modified mullite fiber felt;

[0044] (2) Mix and stir ethyl orthosilicate, distilled water, ethanol, and nitric acid at a molar ratio of 1:10:16:0.005 at 40°C for 2.0 hours, and fully hydrolyze to obtain silica sol; AlCl 3 ·6H 2 O. Distilled water and ethanol were mixed and stirred at 40°C for 2.0 hours at a molar ratio of 1:10:18, and fully hydrolyzed to obtain aluminum sol; the silica sol and aluminum sol were fully mixed according to the volu...

example 3

[0048] (1) ZrOCl 2 ·8H 2 O. Tetraethyl orthosilicate, distilled water, ethanol, and acetic acid are mixed uniformly at a molar ratio of 1:1:12:24:0.06, stirred at 42.5°C for 1.5 hours, and fully hydrolyzed to obtain a silicon-zirconium sol; add to the silicon-zirconium sol Polyethylene glycol 600 with a concentration of 3.5wt% and lithium fluoride with a concentration of 0.4wt% were stirred for 1.5 hours, then vacuumized to immerse the mixed silicon-zirconium sol into an aluminum silicate fiber felt, and dried at 70°C for 1.5 hours after suction filtration. After 1 h, the temperature was raised to 950 °C at 3.5 °C / min, and ZrSiO was obtained after cooling for 1.5 h. 4 Coated modified aluminum silicate fiber felt;

[0049] (2) Mix and stir ethyl orthosilicate, distilled water, ethanol, and nitric acid at 22°C for 2.0 hours at a molar ratio of 1:7:12:0.003, and fully hydrolyze to obtain silica sol; 3 ·6H 2 O. Distilled water and ethanol were mixed and stirred at 40°C for 1.2...

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Abstract

The invention relates to an infrared shielding coating modified fiber reinforced aerogel thermal insulation material and a preparation method thereof. The preparation method takes tetraethoxysilane and ZrOCl2.8H2O as precursors, acetic acid as a catalyst, alcohol water as a solvent and LiF as a mineralizer, and a uniform ZrSiO4 shielding coating with good crystallization is prepared on the fiber surface of refractory fibrofelt through vacuum filtration, drying and heat treatment; and ZrSiO4 coating modified fiber reinforced SiO2 aerogel or a SiO2-Al2O3 aerogel composite heat-insulating material is obtained by taking tetraethoxysilane as a silicon source, AlCl3.6H2O as an aluminum source, nitric acid as a catalyst and epoxide as a coagulant through vacuum impregnation, aging and normal-pressure drying. The prepared material has the normal-temperature thermal conductivity of 0.030-0.036W.m<-1>.K<-1>, and the prepared material has a transmittance of less than 1.0% for infrared light witha wavelength of 10 to 25 [mu]m; and the compressive strength is as high as 0.68MPa at 10% deformation.

Description

technical field [0001] The invention belongs to the field of preparation technology of nanoporous materials, and relates to an infrared shielding coating modified fiber reinforced airgel composite heat insulation material and a preparation method thereof. Background technique [0002] With the development of aerospace technology, more and more aircraft continue to develop in the direction of high speed and long endurance. Simply relying on the heat protection performance of the radome can no longer guarantee the temperature environment of the radar seeker antenna when it is working normally. The reason is mainly due to the high thermal conductivity of current radome materials. In order to meet the normal operation of the aircraft and protect the internal personnel and related equipment, it is necessary to use high temperature resistant super heat insulation materials. [0003] SiO 2 Airgel is a porous solid material with ultra-low density formed by the aggregation of nanop...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B30/02C04B111/80
CPCC04B20/1074C04B30/02C04B2111/80C04B2201/20C04B2201/32C04B2201/50C04B14/42C04B14/4656C04B14/4631C04B14/064
Inventor 李晓雷于慧君尤楠季惠明苏冬
Owner TIANJIN UNIV
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