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Preparation method of aerogel expanded perlite

A technology of expanded perlite and airgel, which is applied in the field of preparation of airgel expanded perlite, can solve problems such as high cost and lower thermal conductivity of perlite, and achieve improved adhesion, production efficiency and product quality, and improved Hydrophobic effect

Active Publication Date: 2016-06-08
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has also used higher cost tetraethyl orthosilicate and dehydrated alcohol
And the process of soaking expanded perlite in silica sol and then vacuum impregnation and adsorption makes the amount of silica sol absorbed into the inner cavity of perlite is very small, which has a limited effect on reducing the thermal conductivity of perlite

Method used

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  • Preparation method of aerogel expanded perlite
  • Preparation method of aerogel expanded perlite
  • Preparation method of aerogel expanded perlite

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preparation example Construction

[0027] A method for preparing airgel expanded perlite, using water glass as a precursor, expanded perlite as a carrier, using a sol-gel method and a vacuum pressure impregnation full-cell method, and filling the airgel or The airgel expanded perlite is coated with expanded perlite, and the prepared airgel expanded perlite has a particle size greater than 0.05mm and a thermal conductivity of 0.020-0.065W / (m·K).

[0028] During specific implementation, the airgel is a hydrophobically modified airgel with a pore size of 2-50nm and a thermal conductivity of less than 0.03W / (m K); the expanded perlite is an expanded perlite with open pores. The diameter is greater than 0.05mm, and the thermal conductivity is 0.025-0.08W / (m K); the vacuum drying process is constant temperature drying or gradient temperature drying; the vacuum pressure impregnation full-cell method and vacuum drying process adopt the following equipment Integrated vacuum drying and pressure impregnation equipment.

Embodiment 1

[0030] A preparation method of airgel expanded perlite, specifically comprising the steps of:

[0031] 1) Mix water glass as the precursor with deionized water, the volume ratio of water glass and deionized water is 1:1, stir for 10 minutes to obtain a uniformly mixed solution;

[0032] 2) Pass the solution obtained in step 1) through an ion exchange column equipped with a hydrogen-type cation exchange resin to remove Na+ ions and other impurity cations in the solution, while reducing the pH value of the solution to 2-3;

[0033] 3) Add ammonia water dropwise to the solution in step 2), adjust the pH value of the solution, control the gel time of the sol to 60 minutes, and place the sol in the sol storage tank of the integrated vacuum drying and pressure impregnation equipment;

[0034] 4) Put the expanded perlite in a vacuum tank, keep the normal pressure (vacuum pressure 0MPa), then heat it to a drying temperature of 60°C, and dry the expanded perlite to a constant weight; ...

Embodiment 2

[0043] A preparation method of airgel expanded perlite, specifically comprising the steps of:

[0044] 1) Mix water glass as the precursor with deionized water, the volume ratio of water glass and deionized water is 1:1, stir for 10 minutes to obtain a uniformly mixed solution;

[0045] 2) Pass the solution obtained in step 1) through an ion exchange column equipped with a hydrogen-type cation exchange resin to remove Na in the solution + ions and other impurity cations, while reducing the pH value of the solution to 2-3;

[0046] 3) Add ammonia water dropwise to the solution in step 2), adjust the pH value of the solution, control the gel time of the sol to 60 minutes, and place the sol in the sol storage tank of the integrated vacuum drying and pressure impregnation equipment;

[0047] 4) Put the expanded perlite in a vacuum tank, evacuate to -0.04MPa, then heat to a drying temperature of 100°C, and dry the expanded perlite to constant weight;

[0048] 5) Continue to evacu...

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Abstract

The invention relates to a preparation method of aerogel expanded perlite, belonging to the field of building energy-saving materials. By using water glass as a precursor and expanded perlite as a carrier, a sol-gel process and a vacuum pressure impregnation (VPI) full-cell treatment process are utilized, and a vacuum drying technique is utilized to fill the hydrophobic aerogel into the expanded perlite or coat the hydrophobic aerogel on the expanded perlite, thereby compounding the aerogel expanded perlite of which the particle size is greater than 0.05 mm and the heat conductivity coefficient is 0.020-0.065 W / (m.K). The aerogel expanded perlite has the advantages of thermal insulation, sound absorption, fire resistance, explosion resistance and radiation resistance, and is an economical environment-friendly green building energy-saving thermal-insulation material.

Description

technical field [0001] The invention relates to the field of building energy-saving materials, in particular to a preparation method of airgel expanded perlite. Background technique [0002] The wall insulation and energy-saving materials used in my country's construction market are mainly divided into two categories: organic and inorganic. Organic thermal insulation materials such as expanded polystyrene board, extruded polystyrene board, sprayed polyurethane, phenolic resin foam board, etc. have small thermal conductivity and good thermal insulation effect, and are widely used in the field of building thermal insulation and energy saving. However, organic thermal insulation materials are easy to burn. Once a fire breaks out, the flame spread will be accelerated and a large amount of toxic gas will be emitted. In addition, organic thermal insulation materials are not resistant to aging, have a large deformation coefficient, poor stability and safety, and cannot achieve the...

Claims

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Application Information

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IPC IPC(8): C04B20/12
CPCC04B20/12C04B20/1074C04B20/1051C04B14/185
Inventor 李珠贾冠华王亮
Owner TAIYUAN UNIV OF TECH
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