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Preparation method of silicon dioxide aerogel for heat insulation

A silica, thermal insulation technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of lower thermal insulation performance, low porosity, high density, etc., and achieve the effect of improving oil absorption capacity

Active Publication Date: 2014-06-18
FUJIAN ZHENGSHENG INORGANIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production method of silica used for thermal insulation is mainly the gel method. The existing gel method silica production generally uses liquid water glass and concentrated sulfuric acid as raw materials, and undergoes gel reaction, press filtration, pulping, It is prepared by spray drying, and the existing problems are: the existing white carbon black has low specific surface area, low porosity and high density, thereby reducing the thermal insulation performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of preparation method of silicon dioxide airgel for thermal insulation of the present invention The specific operation steps are as follows:

[0016] 1. Refined water glass

[0017] Add the solid water glass and water into the steaming ball according to (1~1.5):3, pass in steam, dissolve under the pressure of 0.5~0.6MPa, and keep the pressure for 4~8 hours, and precipitate, take 50m3 and dissolve it in the static pressure kettle The liquid water glass, after leaving standstill clarification, gets the supernatant liquid and is made into concentration and is 25% liquid water glass, for subsequent use.

[0018] 2. Synthesis of silica

[0019] Add 20m3 industrial water to a reactor with a capacity of 50m3, add 1.1-1.2m3 25% liquid water glass, and 0.05 tons of superphosphate lime at the same time, raise the temperature to 40°C, and after the temperature is stable, add it dropwise and refine it under stirring conditions. 25% liquid water glass and concentrated sulfu...

Embodiment 2

[0027] A kind of preparation method of silicon dioxide airgel for thermal insulation of the present invention The specific operation steps are as follows:

[0028] 1. Refined water glass

[0029] Put solid water glass and water into the steaming ball according to (1-1.5): 3, pass in steam, dissolve under the pressure of 0.5-0.6MPa, and keep the pressure for 4-8 hours, precipitate, take 40m3 and dissolve it in the static pressure kettle The liquid water glass, after standing clarification, gets supernatant liquid and is made into concentration and is 20% liquid water glass, for subsequent use.

[0030] 2. Synthesis of silica

[0031] Add 23m3 industrial water into a reactor with a capacity of 50m3, add 1.1-1.2m3 of 20% liquid water glass, and 0.1 tons of superphosphate lime at the same time, raise the temperature to 40°C, and start the reaction after the temperature is stable. Refined 25% liquid water glass and concentrated sulfuric acid to carry out a synthesis reaction, con...

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PUM

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Abstract

The invention discloses a preparation method of silicon dioxide aerogel for heat insulation. The preparation method comprises the following steps: firstly refining liquid water glass, adding a superphosphate leavening agent in advance used as a modifying agent, enabling the liquid water glass and concentrated sulfuric acid to be subjected to two-step method synthetic reaction so as to generate silicon dioxide, after ending reaction, carrying out two-step ageing, filter-pressing, washing, pulping, and drying by pressure so as to obtain special aerogel-process white carbon black for heat insulation. The silicon dioxide particles prepared by the method are relatively uniform and small; the strength of the particles can be obviously improved, the pore volume of the particles is expanded, the oil absorption capacity of the particles is improved, the specific surface area of the product is large, the porosity of the product is high, the density of the product is low, and the product can meet the high heat insulation requirements on silicon dioxide when the silicon dioxide is applied to the field of heat insulation.

Description

technical field [0001] The invention relates to a method for manufacturing an inorganic functional powder material, in particular to a method for preparing silica airgel for thermal insulation. Background technique [0002] Silica airgel is a widely used inorganic functional powder material. Its thermal conductivity is low, and its thermal insulation performance is 5 to 10 times that of traditional materials. It is one of the most ideal thermal insulation materials. At present, the production method of silica used for thermal insulation is mainly the gel method. The existing gel method silica production generally uses liquid water glass and concentrated sulfuric acid as raw materials, and undergoes gel reaction, press filtration, pulping, It is prepared by spray drying, but the existing problems are: the existing white carbon black has low specific surface area, low porosity and high density, thereby reducing thermal insulation performance. The application of silicon dioxid...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 林春兴黄渊勇曾志恩袁建平
Owner FUJIAN ZHENGSHENG INORGANIC MATERIAL