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Aerogel type rare earth composite thermal insulation material and preparation method thereof

A technology of rare earth composite and thermal insulation materials, applied in the field of thermal insulation materials, can solve the problems of limited product life, mechanical properties that cannot be effectively maintained for a long time, and weak interaction forces

Active Publication Date: 2021-05-14
北京宇乾能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies that the existing airgel material has weak internal interaction force and its mechanical properties cannot be effectively maintained for a long time, resulting in limited service life of the product, and provides an airgel type rare earth Composite thermal insulation material and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select alumina particles with a particle size distribution range of 20-40nm, mix them with water at a mass ratio of 1:8, and disperse them ultrasonically for 10 minutes at an ultrasonic frequency of 50kHz to obtain a dispersion, and then in an inert gas protection state Next, add dopamine with 1% of the mass of the dispersion and ascorbic acid with 0.1% of the mass of the dispersion to the dispersion, continue to ultrasonically disperse for 10 min under the condition of an ultrasonic frequency of 50 kHz, and then filter under the protection of an inert gas to collect the filter cake. And the resulting filter cake was vacuum freeze-dried to a constant weight at a temperature of -15°C and a vacuum of 80 Pa to obtain nano-alumina particles coated with dopamine and ascorbic acid, which were pretreated alumina particles;

[0029] In parts by weight, 80 parts of ethyl orthosilicate, 300 parts of absolute ethanol, 8 parts of pretreated alumina particles, 10 parts of tetrabutyl ...

Embodiment 2

[0032] Select alumina particles with a particle size distribution range of 30-40nm, mix them with water at a mass ratio of 1:9, and disperse them ultrasonically for 20 minutes at an ultrasonic frequency of 55kHz to obtain a dispersion, and then in an inert gas protection state Next, add 3% of dopamine and 0.2% of ascorbic acid to the dispersion liquid, continue to ultrasonically disperse for 20min under the condition of ultrasonic frequency of 55kHz, and then filter under the protection of inert gas to collect the filter cake. And the resulting filter cake was vacuum freeze-dried to a constant weight at a temperature of -20°C and a vacuum of 100 Pa to obtain nano-alumina particles coated with dopamine and ascorbic acid, which were pretreated alumina particles;

[0033] In parts by weight, successively take 100 parts of ethyl orthosilicate, 400 parts of absolute ethanol, 12 parts of pretreated alumina particles, 20 parts of tetrabutyl titanate, and 9 parts of rare earth salt sol...

Embodiment 3

[0036] Select alumina particles with a particle size distribution range of 35-40nm, mix them with water at a mass ratio of 1:10, and disperse them ultrasonically for 30 minutes at an ultrasonic frequency of 60kHz to obtain a dispersion, and then in an inert gas protection state Next, add 5% dopamine and 0.3% ascorbic acid to the dispersion liquid, continue to ultrasonically disperse for 30 minutes under the condition of an ultrasonic frequency of 60 kHz, and then filter under the protection of an inert gas to collect the filter cake. And the obtained filter cake was vacuum freeze-dried to a constant weight at a temperature of -30°C and a vacuum of 120 Pa to obtain nano-alumina particles coated with dopamine and ascorbic acid, which were pretreated alumina particles;

[0037] In parts by weight, 120 parts of ethyl orthosilicate, 500 parts of absolute ethanol, 15 parts of pretreated alumina particles, 30 parts of tetrabutyl titanate, and 10 parts of rare earth salt solution with ...

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Abstract

The invention belongs to the technical field of thermal insulation materials, and particularly relates to an aerogel type rare earth composite thermal insulation material and a preparation method thereof. The product developed by the invention comprises silicon dioxide aerogel; a polydopamine layer is adsorbed on the surface of the pore wall of the silicon dioxide aerogel pore, and a rare earth oxide is adsorbed on the surface of the polydopamine layer; and the pore size distribution range of pores of the silicon dioxide aerogel is 20-40 nm. In addition, the material also comprises nano polyacrylate particles, and the nano polyacrylate particles are dispersed in pores of the silicon dioxide aerogel; and the composite material further comprises titanium dioxide aerogel. The preparation method comprises the following steps: mixing and dispersing tetraethoxysilane, absolute ethyl alcohol and dopamine-coated aluminum oxide particles, dropwise adding ammonia water, introducing air after the ammonia water is dropwise added, standing for aging, adjusting the pH value, carrying out ultrasonic impregnation, adding a rare earth salt solution, adjusting the pH value, washing, and drying to obtain the aerogel type rare earth composite thermal insulation material.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials. More specifically, it relates to an airgel type rare earth composite thermal insulation material and a preparation method thereof. Background technique [0002] With the improvement of building energy-saving standards and the advancement of energy-saving technology, building exterior wall insulation materials are also developing in the direction of light weight, multi-function, energy saving and environmental protection. Airgel is a lightweight nanoporous material with a three-dimensional network structure formed by cross-linking colloidal particles or polymer molecules. It has good heat insulation, sound absorption, shock absorption, water repellency, non-combustibility, weather resistance and other characteristics, and is mainly used in high-end fields such as aerospace and industrial high-temperature device heat insulation. Therefore, airgel nanoporous insulation materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01F17/212C01F17/235C01F17/229C01F17/10C08G73/06C01G23/053B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01B33/1585C01G23/001C01G23/053C01P2004/82C01P2006/17C01P2006/32C08G73/0672C01F17/10C01F17/212C01F17/229C01F17/235
Inventor 罗炎
Owner 北京宇乾能源科技有限责任公司
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