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Preparation method of enhanced silicon dioxide aerogel composite material

A technology of silica and composite materials, which is applied in the field of thermal insulation materials, can solve the problems of airgel application range, reduction of thermal insulation performance, environmental pollution, etc., to avoid network skeleton instability, avoid safety hazards, The effect of shortening the preparation cycle

Active Publication Date: 2021-11-12
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent-based coatings are usually applied on the surface of airgel to prevent slag, but solvent-based coatings will cause environmental pollution, and will cause solvents to penetrate into the interior of the airgel, destroying the pore structure and reducing its thermal insulation performance
[0006] At present, due to the poor strength and elasticity of the silica airgel composite material, it is extremely easy to wear and tear, and the occurrence of powder shedding greatly affects the airgel scope of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Pretreatment of fiber materials:

[0031] (a) first pretreatment: hydroxylation treatment of fiber materials; (b) second pretreatment: immersion treatment of hydroxylated fiber materials in methyltrimethoxysilane solution for 12 hours.

[0032] (2), sol impregnation and gelation: Mix the silicon source, ethanol and water evenly, then add the gelling catalyst in order to make the pH of the solution 7, stir evenly to obtain the catalyzed silica sol, impregnate the fiber material with The catalyzed silica sol is gelled to obtain a fiber-reinforced silica wet gel;

[0033] (3) Gel aging: aging the fiber-reinforced silica wet gel at room temperature for 16 hours;

[0034] (4) Solvent replacement: place the fiber-reinforced silica wet gel treated with gel aging in absolute ethanol for solvent replacement;

[0035] (5) Drying treatment: performing supercritical drying treatment on the fiber-reinforced silica wet gel substituted by the solvent to obtain the reinforced sil...

Embodiment 2

[0041] (1) Pretreatment of fiber materials:

[0042] (a) first pretreatment: hydroxylation treatment of fiber materials; (b) second pretreatment: immersion treatment of hydroxylated fiber materials in dimethyldimethoxysilane solution for 10 h.

[0043] (2), sol impregnation and gelling: take silicon source, ethanol and water and mix evenly to obtain silica sol, stir evenly to obtain silica sol, impregnate the fiber material into the silica sol, and then add gelatin coagulation catalyst to obtain fiber-reinforced silica wet gel;

[0044] (3) Gel aging: aging the fiber-reinforced silica wet gel at 50°C for 12 hours;

[0045] (4) Solvent replacement: place the fiber-reinforced silica wet gel treated with gel aging in absolute ethanol for solvent replacement;

[0046] (5) Drying treatment: performing supercritical drying treatment on the fiber-reinforced silica wet gel substituted by the solvent to obtain the reinforced silica airgel composite material.

[0047] Wherein, in ste...

Embodiment 3

[0052] (1) Pretreatment of fiber materials:

[0053] (a) first pretreatment: hydroxylation treatment of fiber materials; (b) second pretreatment: immersion treatment of hydroxylated fiber materials in dimethyldiethoxysilane solution for 16 hours.

[0054] (2), sol impregnation and gelation: Mix the silicon source, ethanol and water evenly, then add the gelling catalyst in order to make the pH of the solution 6.5, stir evenly to obtain the catalyzed silica sol, impregnate the fiber material with The catalyzed silica sol is gelled to obtain a fiber-reinforced silica wet gel;

[0055] (3) Gel aging: aging the fiber-reinforced silica wet gel at 60°C for 10 hours;

[0056] (4) Solvent replacement: place the fiber-reinforced silica wet gel treated with gel aging in absolute ethanol for solvent replacement;

[0057] (5) Drying treatment: performing supercritical drying treatment on the fiber-reinforced silica wet gel substituted by the solvent to obtain the reinforced silica airgel...

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Abstract

The invention belongs to the field of heat insulation materials, and discloses a preparation method of an enhanced silicon dioxide aerogel composite material. A fiber material is pretreated through a two-step pretreatment method to enable hydroxyl groups and Si-OR groups to be attached to surface of the fiber material, and then an enhanced silicon dioxide aerogel composite material is prepared through sol-gel and drying processes. The prepared silicon dioxide aerogel composite material has a high-strength, more complete and uniform aerogel network framework, the framework strength between fibers and silicon dioxide particles and the framework strength between the silicon dioxide particles are greatly improved, and compared with an existing silicon dioxide aerogel composite material, the silicon dioxide aerogel composite material has excellent compression performance.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a preparation method of an anti-powder shedding airgel felt. Background technique [0002] At present, the development of new energy, the improvement of the utilization rate of existing energy and the conservation of energy have attracted great attention from all countries. Therefore, rational use of energy and energy conservation are of great significance to the sustainable development of our society. Adopting new technologies and processes to develop environmentally friendly heat insulation materials is one of the most effective and economical measures to save energy. [0003] SiO 2 As an emerging super heat insulation material, airgel has an extremely low thermal conductivity, which is far lower than the thermal conductivity of 0.25W / m K of static air at room temperature, and has an incomparable heat insulation effect with other materials, and has a lo...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B20/10
CPCC04B30/02C04B20/1051C04B2201/32C04B2201/50C04B14/42C04B14/064C04B14/4618C04B20/0048
Inventor 董会娜张继承张东生何凤霞王琰陈帅张蔓蔓
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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