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Preparation method of composite silica aerogel

A silica and aerogel technology, applied in the field of aerogel, can solve the problems of unsatisfactory pore distribution and particle size of aerogel, and achieve the effects of low cost, simple operation and improved physical properties

Pending Publication Date: 2019-08-16
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a method for preparing a composite silica airgel, which solves the technical problems of unsatisfactory pore distribution and particle size of the airgel prepared by the existing preparation method

Method used

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  • Preparation method of composite silica aerogel
  • Preparation method of composite silica aerogel
  • Preparation method of composite silica aerogel

Examples

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Embodiment 1

[0032] After washing the glass fibers, put them in an oven at 150°C for 12 hours to remove the remaining substances of the fibers and perform fluffing treatment. MTMS (methyltrimethoxysilane) with a total mass of 0.08g, H 2 O, hydrochloric acid aqueous solution and cationic detergent CTAB are added to the beaker, and a certain amount of glass fiber is added to mix and stir evenly. Adjust the pH between 3-4, stir and hydrolyze at 30°C for 1 hour, add 0.5 mol / L ammonia solution and stir for 5 minutes, then gel in ultrasonic to ensure that the fiber layer is evenly distributed until a wet gel is formed. The wet gel was soaked in a mixed solution of ethanol and n-hexane with a volume ratio of 1:1, aged and replaced in an oven at 60°C for 12 hours. Modified with a mixed solution of TMCS and n-hexane solution, and modified in an oven at 55-60°C for 12h. The modified wet gel was immersed in n-hexane, rinsed, and dried at 80°C for 10 hours, at 120°C for 2 hours, and at 150°C for 1 h...

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Abstract

The invention relates to the technical field of aerogels, and especially relates to a preparation method of a composite silica aerogel. The preparation method of the composite silica aerogel comprisesthe following steps: 1, mixing and stirring methyltrimethoxysilane, an aqueous hydrochloric acid solution, a cationic detergent and glass fibers, and hydrolyzing the obtained mixture to obtain a mixed solution; 2, performing ultrasonic treatment on the mixed solution to obtain a wet gel; 3, soaking the wet gel in a solvent, and drying and ageing the soaked wet gel; and 4, modifying, drying and modifying the aged wet gel to obtain the composite silica aerogel. The preparation method of the composite silica aerogel, provided by the invention, solves the technical problem of unsatisfactory poredistribution and particle size of the aerogel prepared by existing preparation methods.

Description

technical field [0001] The invention relates to the technical field of airgel, in particular to a preparation method of composite silica airgel. Background technique [0002] The preparation of wet gel by sol-gel method is the most commonly used process for the preparation of inorganic aerogels. This method usually uses alkoxide or salt as a precursor, and the wet gel is prepared by an acid-base two-step catalysis method, and then Then, the wet gel is dried through subsequent appropriate drying treatment techniques, so as to achieve the purpose of preparing an airgel with a complete skeleton. [0003] The preparation of airgel has been widely studied and applied in the fields of aviation, photocatalytic degradation and solar cells, because its thermal, optical, photocatalytic, adsorption and storage properties directly affect the quality and use of airgel materials. Value, so improving these performances as much as possible is an important indicator pursued by the industry....

Claims

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Application Information

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IPC IPC(8): C01B33/158B01J13/00
CPCC01B33/1585B01J13/0091
Inventor 阳香华林泽卿梁泽礼陈海锋余林
Owner GUANGDONG UNIV OF TECH
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