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Prepn process of super heat insulating material of composite nanometer pore calcium silicate

A thermal insulation material and nanoporous technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of low use temperature and large thermal conductivity, and achieve the effect of increasing strength and reducing thermal conductivity.

Inactive Publication Date: 2005-07-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high thermal conductivity and low use temperature of super thermal insulation materials prepared in the past, and to develop a new type of nanoporous super thermal insulation material with sufficient strength and high temperature resistance

Method used

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  • Prepn process of super heat insulating material of composite nanometer pore calcium silicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First prepare SiO according to the recipe 2 Sol. The specific formula is as follows: Tetrasilicon ethyl ester: ethanol: water = 1: 4.17: 0.28 (volume ratio), and then hydrochloric acid is added to make the pH 3. After stirring the configured airgel precursor for two hours, add water and stir again for about half an hour to prepare SiO 2 Sol.

[0026] Put the formed xonotlite product with a hollow structure into a vacuum device, and carry out a vacuum treatment of 70Pa. The prepared SiO 2 The sol is sucked into the vacuum chamber and compounded with the vacuumed xonotlite product. Then close the vacuum valve immediately. After about half an hour, the vacuum valve is opened, and the floating xonotlite product sucks a large amount of SiO 2 The sol sinks below the liquid surface. After sealing the vacuum, let it stand to form a glue. After the sol is gelled, it is poured into an ethanol solution with a volume ratio of water:ethanol=1:4 for aging, and the poured etha...

Embodiment 2

[0028] Prepare SiO according to the recipe 2 Sol. Orthosilyl ethyl ester: ethanol: water = 1: 6: 0.20 (volume ratio). Hydrochloric acid was then added to bring the pH to 3. Stir the configured airgel precursor for 2.5 hours, then add water and stir again for about half an hour to prepare SiO 2 Sol.

[0029] The formed xonotlite product with a hollow structure is put into a vacuum device, and vacuumized to a vacuum degree of 70Pa. The prepared SiO 2 The sol is sucked into the vacuum chamber and compounded with the vacuumed xonotlite product. Then close the vacuum valve immediately. After about half an hour, the vacuum valve is opened, and the floating xonotlite product sucks a large amount of SiO 2 The sol sinks below the liquid surface. After sealing the vacuum, let it stand to form a glue. After the sol is gelled, it is poured into an ethanol solution with a volume ratio of water:ethanol=1:4 for aging, and the poured ethanol solution must exceed the liquid level of t...

Embodiment 3

[0031] The solution was prepared according to the formula of tetrasilyl ethyl ester:ethanol:water=1:7:0.28 (volume ratio), and then hydrochloric acid was added to make the pH 4. After stirring the configured airgel precursor for two hours, add water and stir again for about half an hour to prepare SiO 2 Sol.

[0032] Put the formed xonotlite product with a hollow structure into a vacuum device, and perform vacuum treatment at 100Pa. The prepared SiO 2 The sol is sucked into the vacuum chamber and compounded with the vacuumed xonotlite product. Then close the vacuum valve immediately. After about half an hour, the vacuum valve is opened, and the floating xonotlite product sucks a large amount of SiO 2 The sol sinks below the liquid surface. After sealing the vacuum, let it stand to form a glue. After the sol is gelled, it is poured into an ethanol solution with a volume ratio of water:ethanol=1:4 for aging, and the poured ethanol solution must exceed the liquid level of t...

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Abstract

The present invention belongs to the field of inorganic non-metal material, and is especially the preparation process of heat insulating composite nanometer pore calcium silicate material. The preparation process includes first preparation of block, tubular and tile-like product comprising secondary particle of superfine xonotlite crystal; the preparation of SiO2 gel precursor; pouring the gel precursor into porous xonotlite product; letting stand for gelation and ageing and supercritical drying in high pressure autoclave. By means of the compounding of hard support skeleton of superfine xonotlite fiber with hollow secondary pellet and SiO2 aerosol, the present invention has greatly lowered heat conducting coefficient and greatly raised strength.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a preparation method of a calcium silicate composite nanoporous super heat insulating material. technical background [0002] With the continuous development of industry, traditional thermal insulation materials are no longer suitable for the development of the situation. Using new technologies (such as nanotechnology) to develop lightweight and efficient super thermal insulation materials has become the leading direction for the development of thermal insulation materials today. In recent years, the most studied in the world is SiO 2 Aerogel-based super thermal insulation material. SiO 2 Airgel is a new type of lightweight nanoporous amorphous solid material with excellent properties such as high porosity, typical nanopore size, low packing density and lower thermal conductivity than static air at room temperature. A new type of material with broad application ...

Claims

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Application Information

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IPC IPC(8): C04B14/04C04B14/38C04B38/08
Inventor 倪文陈淑祥张大陆徐丽肖晋宜
Owner UNIV OF SCI & TECH BEIJING
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