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High-temperature resistant silica aerogel heat preservation felt preparation method

A technology of silica and thermal insulation felt, applied in the field of thermal insulation materials, can solve the problems of reducing the thermal insulation performance of thermal insulation materials, reducing thermal insulation performance of thermal insulation materials, reducing the stability of gel structure, etc. Effect of sodium ion content

Inactive Publication Date: 2019-04-05
冷水江三Ａ新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that under high temperature conditions, the impurities in silica airgel will reduce the stability of the gel structure, causing the airgel pores to shrink and collapse, thereby reducing the thermal insulation performance of the insulation material.
Using sodium silicate as a raw material to produce silica airgel technology, the product produced has a high sodium content, and the stability of the pores decreases at higher temperatures, resulting in a decrease in the thermal insulation performance of the insulation material, which is not suitable for insulation at high temperatures Insulation materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the high temperature resistant silica airgel insulation felt provided in this embodiment comprises the following steps:

[0029] S1: Ingredients

[0030] Adding 1000 g of industrial sodium silicate with a modulus of 3.1 to prepare an aqueous solution of sodium silicate with a silicon dioxide mass percentage content of 3%;

[0031] Preparation mass percentage content is the sulfuric acid aqueous solution of 30%;

[0032] Prepare an aqueous solution of silane coupling agent with a mass percentage content of 1%, and the silane coupling agent is KH550;

[0033] S2: Sol Synthesis

[0034] Add the prepared sodium silicate aqueous solution and sulfuric acid aqueous solution into the reaction kettle at the same time, the feeding rate of the sodium silicate aqueous solution is 300g / min, and at the same time, the pH value of the mixing system is kept at 2.5, and after the addition is completed, stir at room temperature for 20 minutes to obtain Sol;

...

Embodiment 2

[0049] The preparation method of the high temperature resistant silica airgel insulation felt provided in this embodiment comprises the following steps:

[0050] S1: Ingredients

[0051] Adding 1000 g of industrial sodium silicate with a modulus of 3.2 to prepare an aqueous solution of sodium silicate with a silicon dioxide mass percentage content of 4%;

[0052] Preparation mass percentage content is the sulfuric acid aqueous solution of 25%;

[0053] Prepare an aqueous solution of silane coupling agent with a mass percentage content of 1%, and the silane coupling agent is KH570;

[0054] S2: Sol Synthesis

[0055] Add the prepared sodium silicate aqueous solution and sulfuric acid aqueous solution into the reaction kettle at the same time, the feeding rate of the sodium silicate aqueous solution is 200g / min, and at the same time, the pH value of the mixing system is kept at 2.2. After the addition is completed, stir at room temperature for 25 minutes to obtain Sol;

[0056...

Embodiment 3

[0070] The preparation method of the high temperature resistant silica airgel insulation felt provided in this embodiment comprises the following steps:

[0071] S1: Ingredients

[0072] Adding 1000 g of industrial sodium silicate with a modulus of 3.1 to prepare an aqueous sodium silicate solution with a silicon dioxide mass percentage content of 5%;

[0073] Preparation mass percentage content is the sulfuric acid aqueous solution of 20%;

[0074] Prepare an aqueous solution of silane coupling agent with a mass percentage content of 1%, and the silane coupling agent is KH550;

[0075] S2: Sol Synthesis

[0076] Add the prepared sodium silicate aqueous solution and sulfuric acid aqueous solution into the reaction kettle at the same time, the feeding rate of the sodium silicate aqueous solution is 100g / min, and at the same time, the pH value of the mixing system is kept at 3.0, and after the addition is completed, stir at room temperature for 25 minutes to obtain Sol;

[0...

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Abstract

The invention belongs to the technical field of thermal insulation materials, and particularly discloses a high-temperature resistant silica aerogel heat preservation felt preparation method, which includes taking industrial sodium silicate as a raw material; adopting fiber coupling; then frequently washing with warm water to remove impurities; continuously circulating and replacing solvent ethanol; and finally drying at normal pressure to prepare the silica aerogel heat preservation felt. The silica aerogel heat preservation felt has the advantages of high purity and high temperature resistance, the sodium ion content of the heat preservation felt is less than 0.05 wt%, and the thermal conductivity at 500 DEG C is less than 0.025 W / (m*k). In addition, the high-temperature resistant silicaaerogel heat preservation felt preparation method has the advantages of cheap and easily-available raw materials, stable operation and easier industrialization.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a preparation method of high-temperature-resistant silica airgel thermal insulation felt. Background technique [0002] Energy saving is of great significance to human survival and sustainable development. It not only saves limited resources, but also improves the environment on which human beings live. Insulation materials play an important role in the field of energy conservation. It is known as the "fifth energy source" in the world, and it is a high-tech material that is being vigorously developed by various countries. Thermal insulation materials mainly include organic thermal insulation materials and inorganic thermal insulation materials. Organic thermal insulation materials are gradually replaced by inorganic thermal insulation materials due to their tendency to catch fire. Inorganic insulation materials mainly include various fiber insulation felts....

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B111/10
CPCC04B30/02C04B2111/10C04B2201/32C04B14/4656C04B14/064
Inventor 胡颖妮胡湘仲胡伟民
Owner 冷水江三Ａ新材料科技有限公司
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