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Composite heat insulation pad and manufacturing process thereof

A manufacturing process and heat insulation pad technology, applied in the field of heat-resistant materials, can solve the problems of limiting the application of pure silica airgel, serious cracking of airgel, poor integrity, etc., and achieve low environmental hazards, high insulation performance, The effect of long service life

Active Publication Date: 2021-12-31
重庆智笃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

Due to SiO 2 The characteristics of airgel, such as low density, irregular pore structure, disordered three-dimensional network morphology and dense agglomeration to form a density gradient, lead to SiO 2 Airgel cracking is relatively serious and its integrity is poor, which limits the application of pure silica aerogels
In SiO 2 In the field of airgel and fiber composites, fibers such as glass fibers, mullite fibers and quartz fibers are commonly used in the form of chopped fibers or fiber mats with SiO 2 Airgel is composited, and it is difficult to use it in a higher temperature (above 300°C) environment due to the defects of the fiber itself

Method used

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  • Composite heat insulation pad and manufacturing process thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] A manufacturing process of a composite heat insulating pad, the manufacturing process of said thermal insulating pad comprises the following steps: as figure 1 as shown,

[0042] S1. Preparation of airgel precursor hydrolyzate: select 50 grams of orthosilicate and hydrolysis agent (100 grams of deionized water and 300 grams of absolute ethanol) according to the proportion and mix them well, first add hydrochloric acid solution to adjust the pH value to 3-5 , stirring for the first time for 15 minutes, then adding ammonia water to adjust the pH value to 7-8, and stirring for the second time for 15 minutes to obtain the airgel precursor hydrolyzate;

[0043] S2. Substrate impregnation: put the basalt fiber needle-punched felt substrate with a thickness of 1mm in the airgel precursor hydrolyzate and immerse it for 30 seconds through the unwinding machine, and then squeeze and wind through the winding machine to impregnate the airgel precursor The basalt fiber needle-punch...

Embodiment 2

[0046] A manufacturing process of a composite heat insulating pad, the manufacturing process of said thermal insulating pad comprises the following steps: as figure 1 as shown,

[0047] S1. Preparation of airgel precursor hydrolyzate: select 200 grams of orthosilicate and hydrolyzing agent (500 grams of deionized water and 850 grams of absolute ethanol) according to the corresponding ratio and mix well, first add hydrochloric acid solution to adjust the pH value to 3- 5. Stir for the first time for 60 minutes, then add ammonia water to adjust the pH to 7-8, and stir for the second time for 60 minutes to obtain the airgel precursor hydrolyzate;

[0048] S2. Substrate impregnation: put the 20mm thick basalt fiber needle-punched felt substrate in the airgel precursor hydrolyzate and immerse it for 120 seconds through the unwinder, and then squeeze and wind through the winder to impregnate the airgel precursor The basalt fiber needle-punched felt base material after the hydrolysi...

Embodiment 3

[0051] A manufacturing process of a composite heat insulating pad, the manufacturing process of said thermal insulating pad comprises the following steps: as figure 1 as shown,

[0052] S1. Preparation of airgel precursor hydrolyzate: select 50 grams of orthosilicate and hydrolyzing agent (100 grams of deionized water and 300 grams of absolute ethanol) according to the corresponding ratio and mix well, first add hydrochloric acid solution to adjust the pH value to 3- 5. Stir for the first time for 15 minutes, then add ammonia water to adjust the pH to 7-8, and stir for the second time for 60 minutes to obtain the airgel precursor hydrolyzate;

[0053] S2. Substrate impregnation: put the basalt fiber needle-punched felt substrate with a thickness of 1mm in the airgel precursor hydrolyzate and immerse it for 30 seconds through the unwinding machine, and then squeeze and wind through the winding machine to impregnate the airgel precursor The basalt fiber needle-punched felt base...

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Abstract

The invention belongs to the technical field of heat-resistant materials, and discloses a composite heat insulation pad and a manufacturing process thereof. An ultrathin (1mm thick) superfine basalt fiber aerogel composite heat insulation pad can be prepared by taking superfine basalt fiber needled felt as a raw material, and can be applied to the field of high-temperature heat insulation materials for power batteries. The product with higher high-temperature resistance and lower heat conductivity coefficient is prepared, and the insulating composite material has better heat insulation performance, higher insulating performance, longer service life and smaller environmental harm. The superfine basalt fiber aerogel composite heat insulation pad can be used as a heat insulation material with better performance and can be more widely applied to heat energy equipment of metallurgy, machinery, electric power and chemical industry and the fields of aerospace and military industry. According to the method, the aged superfine basalt fiber needled felt is directly dried in a supercritical mode to obtain the gel state of the superfine basalt fiber needled felt, so that the step of replacing a solvent is omitted, the production efficiency is improved, the drying time is shortened, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant materials, and in particular relates to a composite heat-insulating pad and a manufacturing process thereof. Background technique [0002] With the development of inorganic ceramic fiber materials, various SiO 2 , Al 2 o 3 The silicon-aluminum and alumina fibers with high content are made of board or fiber felt. This material does not expand when heated, has good heat insulation and high temperature thermal shock resistance, so it is widely used in industrial devices or high temperature combustion furnaces for heat preservation and insulation. hot. In addition, it is also widely used in aerospace thermal protection engineering. However, due to the properties of its materials, the theoretical thermal conductivity of the heat resistance coefficient is between 0.045W / (m·K) and 0.210W / (m·K). Due to SiO 2 The characteristics of airgel, such as low density, irregular pore structure, disorde...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B30/02C04B2201/32C04B14/4643C04B14/064
Inventor 肖尧刘云跃
Owner 重庆智笃新材料科技有限公司