Preparation method of aerogel fiber composite felt, aerogel fiber composite felt and application of aerogel fiber composite felt

A fiber composite and airgel technology, applied in the field of materials, can solve the problems of no substantial improvement in the toughness of the composite felt, affecting the comprehensive performance of the composite felt, and cracking of the airgel in the composite felt, so as to achieve uniform internal components and long service life Long, prevent cracking and collapse effect

Pending Publication Date: 2018-06-19
瑞吉斯昇态链(天津)咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation method is mainly to immerse the needle-punched felt in the silica airgel slurry, take it out and dry it and make it. The airgel in the composite felt made in this way still has the problem of cracking and collapse, and The lack of aging process will lead to the unstable structure of the airgel, and the toughness of the prepared composite felt will not be substantially improved, which will affect the comprehensive performance of the composite felt

Method used

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  • Preparation method of aerogel fiber composite felt, aerogel fiber composite felt and application of aerogel fiber composite felt
  • Preparation method of aerogel fiber composite felt, aerogel fiber composite felt and application of aerogel fiber composite felt

Examples

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preparation example Construction

[0029] On the one hand, the invention provides a kind of preparation method of airgel fiber composite mat, comprises the following steps:

[0030] (a) Mix the fiber with a length of 1-3 mm and silica sol to obtain a mixed solution, the temperature of the mixed solution is 60-90 ° C, the pH value is 2-4, and the weight ratio of fiber to silica sol is 1: (5- 10);

[0031] (b) adjust the pH value of the mixed solution to 8-9 with a weak base, immerse the fiber mat soaked in alcohol in the mixed solution before forming the airgel, and gelatinize at a temperature of 60-90°C;

[0032] (c) putting the gelled fiber mat into an aging modification solution for aging modification for 12-24 hours at a temperature of 40-60°C; the aging modification solution includes an aqueous solution of trimethylchlorosilane and alcohol;

[0033] (d) drying the fiber mat to obtain an airgel fiber composite mat.

[0034] In this method, short-cut fibers are added to the silica sol, and the fibers form a...

Embodiment 1

[0051] A preparation method of airgel fiber composite felt, comprising the following steps:

[0052] (a) Heating the silica sol to 60°C, mixing the viscose fiber cut to 3 mm with the silica sol solution evenly to prepare a mixed solution, the weight ratio of the fiber to the silica sol is 1:5, and adjusting the pH to 2;

[0053] (b) Adjust the pH of the mixed solution to 8 with a weak base, immerse the composite fiber mat soaked in alcohol (the weight ratio of ceramic fiber and glass fiber is 5:4) in the mixed solution before forming the airgel, and keep the temperature 60°C for gelation;

[0054] (c) put the composite felt into trimethylchlorosilane / alcohol / water solution (1:1:1 by weight ratio) for aging modification for 12 hours at a temperature of 40°C;

[0055] (d) Take out the composite felt and dry it at room temperature for 5 hours to prepare the airgel fiber composite felt.

Embodiment 2

[0057] A preparation method of airgel fiber composite felt, comprising the following steps:

[0058] (a) Heating the silica sol to 90°C, mixing the glass fiber cut to 3 mm with the silica sol solution evenly to prepare a mixed solution, the weight ratio of the fiber to the silica sol is 1:10, and adjusting the pH to 2;

[0059] (b) Adjust the pH of the mixed solution to 9 with a weak base, immerse the composite fiber mat soaked in alcohol (the weight ratio of ceramic fiber and glass fiber is 8:2) in the mixed solution before forming the airgel, and keep the temperature 90°C for gelation;

[0060] (c) put the composite felt in trimethylchlorosilane / alcohol / water solution (weight ratio 1:1:1) for aging modification for 18 hours at a temperature of 45°C;

[0061] (d) Take out the composite felt and dry it at room temperature for 5 hours to prepare the airgel fiber composite felt.

[0062] Compared with Example 1, Example 2 optimizes the composition of the fiber mat.

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Abstract

The invention relates to the field of materials, and concretely provides a preparation method of an aerogel fiber composite felt, the aerogel fiber composite felt and an application of the aerogel fiber composite felt. Fibers are added into silica sol, and are uniformly distributed in the silica sol to prepare a mixed solution, the mixed solution forms aerogel in a composite fiber felt, and further ageing modification is performed to prepare the aerogel fiber composite felt. The weight proportion of the fibers is controlled to make the fibers form a three-dimensional network skeleton in the aerogel in order to further achieve the supporting effect, so the stability and the toughness of the composite felt are improved; and the ageing modification further improves the stability and the service life of the composite felt. The preparation method has the advantages of simplicity and controllability in production operation, time saving, and cost reduction. The composite felt prepared in theinvention has a low heat conduction coefficient, doubled flexural resistance and doubled compressive property. The composite belt can be widely applied, and meets demands of different uses and environments.

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method of an airgel fiber composite felt, an airgel composite felt and its application. Background technique [0002] Silica airgel is a lightweight nanoporous amorphous solid material with excellent heat resistance and heat insulation performance. Its porosity is as high as 80-99.8%, the typical size of the pores is 1-100nm, and the specific surface area is 200-1000m 2 / g, while the density can be as low as 3kg / m 3 , The thermal conductivity at room temperature can be as low as 0.012W / (m·k). It is precisely because of these characteristics that airgel materials have broad application potential in thermal, acoustic, optical, microelectronics, and particle detection. However, during the preparation process, problems such as skeleton shrinkage cracking and hole collapse are prone to occur when the wet gel dries. [0003] Traditional thermal insulation materials mainly face...

Claims

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Application Information

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IPC IPC(8): D06M11/79D06M13/517D06M13/144D06M101/06
CPCD06M11/79D06M13/144D06M13/517D06M2101/06
Inventor 孙晔崔伟腾胡菊李振声王世伟王振宇
Owner 瑞吉斯昇态链(天津)咨询有限公司
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