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Production technique of super-heat-insulation material silica gel

A technology of thermal insulation material and production process, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of instability and small pore volume, and achieve good economic and social benefits, and the effect of long-term stability of product pore volume value.

Active Publication Date: 2015-04-29
烟台喜力康航天科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, silica airgel is unstable, and after absorbing moisture in the air, the pore volume will gradually become smaller

Method used

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  • Production technique of super-heat-insulation material silica gel
  • Production technique of super-heat-insulation material silica gel
  • Production technique of super-heat-insulation material silica gel

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The production process of a kind of super heat insulating material silica gel of the present embodiment comprises the following production steps:

[0032] (1), preparation of hydrogel:

[0033] Using the traditional hydrogel preparation method, the SiO 2 Water glass with a concentration of 16% and dilute sulfuric acid with a concentration of 26% are pumped into the mixer 3 respectively, and are quickly mixed in the nozzle to form a sol. The reaction conditions for the formation of the sol are that the pH value reaches 2.0, the free acid is 0.2-0.7%, and the reaction temperature 20°C, flow into the gel tank, place until the sol gels, and perform aging. The aging time is 48 hours.

[0034] After aging, cut the gel into small pieces of 2.5-3.5cm, put it into the washing tank, wash it with tap water first, then with deionized water, and wash until the SO in the gel 4 2- The mass percentage concentration is less than 0.1%, and it is reserved.

[0035] (2) Formation of o...

Embodiment 2

[0046] The production process of a kind of super heat insulating material silica gel of the present embodiment comprises the following production steps:

[0047] (1), preparation of hydrogel:

[0048] Using the traditional hydrogel preparation method, the SiO 2 Water glass with a concentration of 18% and dilute sulfuric acid with a concentration of 28% are pumped into the mixer 3 respectively, and are quickly mixed in the nozzle to form a sol. The reaction conditions for sol generation are as follows: pH value 2.2, free acid 0.2-0.7%, reaction temperature At 25°C, flow into the gel tank, place until the sol gels, and perform aging. The aging time is 45 hours.

[0049] After aging, cut the gel into small pieces of 2.5-3.5cm, put it into the washing tank, wash it with tap water first, then with deionized water, and wash until the SO in the gel 4 2- The mass percentage concentration is less than 0.1%, and it is reserved.

[0050] (2) Formation of organogel:

[0051] Put the h...

Embodiment 3

[0061] The production process of a kind of super heat insulating material silica gel of the present embodiment comprises the following production steps:

[0062] (1), preparation of hydrogel:

[0063] Using the traditional hydrogel preparation method, the SiO 2 Water glass with a concentration of 20% and dilute sulfuric acid with a concentration of 30% are pumped into the mixer 3 respectively, and are quickly mixed in the nozzle to form a sol. The reaction conditions for the formation of the sol are that the pH value is 2.5, the free acid is 0.2-0.7%, and the reaction temperature is 30°C, flow into the gel tank, place until the sol gels, and perform aging. The aging time is 40 hours.

[0064] After aging, cut the gel into small pieces of 2.5-3.5cm, put it into the washing tank, wash it with tap water first, then with deionized water, and wash until the SO in the gel 4 2- The mass percentage concentration is less than 0.1%, and it is reserved.

[0065] (2) Formation of org...

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Abstract

The invention relates to a production technique of a super-heat-insulation material silica gel, belonging to the technical field of super-heat-insulation material production techniques. The production technique of the super-heat-insulation material silica gel comprises the following steps: (1) preparation of aquogel; (2) generation of organogel; (3) double-tower distillation; (4) hydrophobic treatment; (5) spray drying; and (6) product detection. The pore volume of the product produced according to the production technique provided by the invention has long-term stability, and the primary indexes completely achieve the technical quality indexes required by the super-heat-insulation material silica gel; and the production technique can be completely put into practical application and popularization in industrial production, and thus, has favorable economic benefit and social benefit.

Description

technical field [0001] The invention relates to a production process of super heat insulating material silica gel, belonging to the technical field of super heat insulating material production process. Background technique [0002] Special application fields and silica gel varieties that have very special requirements on the technical performance of products are still in the high-end field of the latest technology development of silica gel. For example, the macroporous hydrophobic silica airgel used as a "super thermal insulation material" is the most representative type of silica gel. [0003] In 1931, Kistler of Stanford University in the United States first discovered that organic solvents were used to replace the water in the pore volume of hydrogel silica gel, and the vapor of the solvent was released under the control of the critical temperature of the solvent. Since the gas-liquid interface disappeared at this time, the interfacial tension tended to " 0", the aerog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/16
Inventor 刘谦刘洪章王松年韩德铭
Owner 烟台喜力康航天科技有限公司
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