Method for preparing aerogel composite material by using tetramethyl orthosilicate

A technology of methyl orthosilicate and composite materials, applied in the directions of silicon oxide, silicon dioxide, etc., can solve problems such as unfavorable environmental protection, complicated preparation process, complicated preparation process, etc., to avoid the occurrence of gel and simple preparation process. , the effect of inhibiting the gel reaction

Inactive Publication Date: 2017-06-09
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings in the preparation technology of airgel composite materials such as complex preparation process, inaccurate control of gel time, many types of catalysts, and unfavorable environmental protection, the present invention provides a gel-controllable silica airgel composite Materials and methods for their preparation
The preparation process does not need to add additional catalysts, only methyl orthosilicate, alcohol solvent and water are needed, less raw materials are used, the preparation process is simple, and the gelation time of the sol system can be controlled to ensure that the sol can fully impregnate the fibers before gelation, solving the problem of Solved the problems of the complex preparation process of airgel composites and the inability to accurately control the sol-gel time, and laid the foundation for the preparation of high-performance airgel composites

Method used

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  • Method for preparing aerogel composite material by using tetramethyl orthosilicate
  • Method for preparing aerogel composite material by using tetramethyl orthosilicate
  • Method for preparing aerogel composite material by using tetramethyl orthosilicate

Examples

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preparation example Construction

[0061] (1) Preparation of sol: first pour methyl orthosilicate and water in proportion as attached figure 1 Shown in the reaction-circulation cooling equipment, fully stirred, then add alcohol solvent to the system, continue to stir, to obtain silica sol;

[0062] (2) sol dipping: immersing the fiber material in the sol;

[0063] (3) Stand still: put the fiber material / sol system in a low temperature environment from -40°C to 0°C;

[0064] (4) Gel: the fiber material / sol system is taken out from the low temperature environment, and gelled at room temperature or under heating conditions to obtain a silica wet gel;

[0065] (5) Aging: aging at room temperature or under heating for 8 hours to 168 hours;

[0066] (6) Solvent replacement: put the aged wet gel material into an alcohol solvent or a ketone solvent so that the water content is lower than 1%;

[0067] (7) Surface treatment: soak the wet gel that has completed the solvent replacement with a hydrophobizing agent;

[0...

Embodiment 1

[0096] Add orthosilicate methyl ester, deionized water and absolute ethanol into the reaction-circulation cooling equipment and mix well to prepare silica sol, and the cooling temperature is -15°C. The molar ratio of methyl orthosilicate, deionized water and alcohol solvent is 1:8:4.

[0097]Impregnate glass fiber wool with the prepared silica sol, and the impregnation method adopts the method (a) described herein to carry out, that is, directly add silica sol to the mold cavity that is equipped with glass fiber wool with a bulk density of 0.08 g / cubic centimeter (consisting of No. 45 steel, and the inner surface of the cavity is coated with anti-corrosion coating polytetrafluoroethylene), rely on gravity impregnation; then, let it stand at -15°C for 48 hours, take it out, and put it at a gel temperature of 25°C A fibrous gel was obtained in 24 hours. After aging for 48 hours in ethanol as a solvent at a temperature of 25° C., surface treatment was carried out for 6 hours wit...

Embodiment 2 to 9

[0099] Examples 2 to 9 were carried out in the same manner as in Example 1 except for the contents and notes shown in Tables 1, 2 and 3.

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Abstract

The invention provides a method for preparing an aerogel composite material by using tetramethyl orthosilicate. The method comprises the following steps: (1) preparing silica sol: preparing the silica sol from tetramethyl orthosilicate and water, which serve as raw materials, in a manner of taking an alcohol solvent as a solvent; and (2) carrying out sol dipping: dipping a fiber material with the silica sol at the temperature of -40 DEG C to 0 DEG C, thereby obtaining a fiber material / sol system. By adopting the method, planar and irregular-profile materials of diverse sizes can be conveniently and selectively prepared, the gelation time is controllable, a catalyst is not required, the variety of the raw materials is small, the operation is simple and convenient, and the environmental pollution is light. The material is excellent in heat-insulating property and has a broad application prospect in the fields of civilian industry, aerospace & aviation industry, military industry, and the like.

Description

technical field [0001] The invention relates to the technical field of material preparation technology, in particular, the invention relates to a gel-controllable airgel composite material and a preparation method thereof. Background technique [0002] With the rapid development of human economic life, the human demand for energy is increasing, and the damage to the environment is also increasing. In the face of the world's energy shortage and the crisis of environmental damage, the research of high-efficiency and energy-saving materials is generally emphasized at home and abroad, in order to reduce energy waste and improve use efficiency. Among them, improving the thermal insulation technology level in industry, construction, military and other fields is of great significance for energy saving and emission reduction. As a new type of lightweight nanoporous material, airgel material is the most efficient heat insulation material discovered so far. Airgel is also known as "...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C01B33/16
Inventor 王瑞杰张凡艾素芬金兆国
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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