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High-strength high-thermal-insulation silica aerogel and preparation method thereof

A silica, high-strength technology, applied in ceramic products, other household appliances, applications, etc., can solve the problem of airgel thermal insulation performance decline, silica airgel porosity increase, affecting super thermal insulation performance, etc. problems, to improve the mechanical properties, solve the effect of reinforcement and heat insulation

Inactive Publication Date: 2016-05-11
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have greatly improved the mechanical properties of silica airgel materials, due to the introduction of a large number of other phase components, the porosity of silica airgel will also increase significantly, making the airgel The thermal insulation performance of the thermal insulation is significantly reduced, which seriously affects its precious super thermal insulation performance

Method used

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  • High-strength high-thermal-insulation silica aerogel and preparation method thereof
  • High-strength high-thermal-insulation silica aerogel and preparation method thereof
  • High-strength high-thermal-insulation silica aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step (1) Ultrasonically disperse 10 g of halloysite in 200 mL of dimethyl sulfoxide, then add 0.1 g of N, N-carbonyldiimidazole, continue stirring at 70 ° C for 2 h, and then add 1 g of Amino mono-terminated polydimethylsiloxane, after reacting at 55°C for 6h, filter the product, wash the product with distilled water until it is neutral, and dry it in a blast drying oven at 100°C for 24h.

[0031] Step (2) Mix and stir 20g of tetraethylorthosilicate and 90g of absolute ethanol for 20min, add dropwise 6g of distilled water and 2g of hydrochloric acid, continue stirring for 55min, add 20g of the halloysite product obtained in step (1), ultrasonically disperse for 40min, and Stand still at 45°C for 7 hours for full acid hydrolysis, then add 0.5g of dimethylformamide and 2g of ammonia water, let stand for 24 hours to obtain a wet gel and allow the unstable structure in the gel to continue to react and solidify, add Mixture of 80g water and 15g absolute ethanol, let it stand...

Embodiment 2

[0033] Step (1) Ultrasonically disperse 5g of halloysite in 500mL of dimethyl sulfoxide, then add 0.1g of N,N-carbonyldiimidazole, keep stirring at 50°C for 5h, then add 1g of ethylene with a number average molecular weight of 2000 Amino double-terminated polydimethyldivinylsiloxane with a molar percentage of 4%, after reacting at 50°C for 3h, filter the product, wash the product with distilled water until neutral, and place it in a blast drying oven at 100°C Dry within 48 hours.

[0034] Step (2) Mix and stir 30 g of tetraethyl orthosilicate and 100 g of absolute ethanol for 20 min, add dropwise 10 g of distilled water and 3 g of hydrochloric acid, continue stirring for 30 min, add 5 g of the halloysite product obtained in step (1), and ultrasonically disperse for 30 min. Stand still at 50°C for 10 hours for full acid hydrolysis, then add 2g of dimethylformamide and 1g of ammonia water, let stand for 48 hours to obtain a wet gel and allow the unstable structure in the gel to ...

Embodiment 3

[0036] Step (1) Ultrasonically disperse 15g of halloysite in 250mL of dimethyl sulfoxide, then add 0.6g of N,N-carbonyldiimidazole, keep stirring at 55°C for 4h, then add 2g of ethylene with a number average molecular weight of 3000 Amino double-terminated polydimethyldivinyldiphenylsiloxane with a molar percentage of 2% phenyl content of 1% molar content, reacted at 60°C for 7h, filtered the product, and washed the product with distilled water until Neutral, dry in a 100°C blast oven for 36 hours.

[0037] Step (2) Mix 10 g of tetraethyl orthosilicate and 80 g of absolute ethanol and stir for 20 min, add dropwise 6 g of distilled water and 2.5 g of hydrochloric acid, continue stirring for 45 min, add 25 g of the halloysite product obtained in step (1), and ultrasonically disperse for 45 min. Stand still at 45°C for 7 hours to carry out sufficient acid hydrolysis, then add 1.2g dimethylformamide and 1.6g ammonia water, let stand for 36 hours to obtain a wet gel and allow the u...

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Abstract

The invention discloses high-strength high-thermal-insulation silica aerogel and a preparation method thereof. The preparation method comprises the following steps: modifying halloysite with amino-terminated polysiloxane; adding ethyl orthosilicate, absolute ethyl alcohol, hydrochloric acid, dimethyl formamide and ammonium hydroxide to ensure a reaction and obtain gel; finally, carrying out carbon dioxide supercritical extraction to obtain the silica aerogel. As hollow natural clay fiber halloysite which is high in mechanical strength, low in thermal conductivity and high in thermal stability is taken as a reinforcing phase, the silica aerogel prepared according to the preparation method is relatively high in porosity, relatively low in density, excellent in mechanical property, favorable in heat-insulating property and relatively high in heat resistance.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and more specifically relates to a high-strength, high-thermal insulation silica airgel and a preparation method thereof. Background technique [0002] Silica airgel is a new type of nanoporous material with low density, transparency and controllable structure. Compared with traditional silica particles, silica airgel has a continuous three-dimensional network structure, and has structural characteristics such as low density, high porosity, and high specific surface area (research on silica airgel prepared from different silicon sources Progress, Wang Ni et al., Materials Report A: Review, 2014, Vol. 28, No. 1, 42-45). At the same time, it has excellent thermal insulation performance, and its thermal conductivity is extremely low under normal temperature and pressure. It is the solid material with the lowest thermal conductivity known so far, and has broad application prospects in the...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B14/064C04B14/4656C04B20/023C04B30/02C04B38/0045C04B2201/20C04B2201/32C04B2201/50C04B38/0074C04B38/0054C04B38/0067
Inventor 李洪彦刘洪丽李婧李亚静褚鹏程林
Owner TIANJIN CHENGJIAN UNIV
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