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A kind of method and application of making water glass airgel product by freeze-drying method

A technology of freeze-drying and water glass, applied in the direction of silica, silicon oxide, etc., can solve the problems of risk limitation and high cost, and achieve the effects of low time cost, low comprehensive cost and high porosity

Inactive Publication Date: 2015-10-07
江苏龙睿建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although supercritical fluid is a fluid that can effectively eliminate capillary force and avoid the shrinkage of the gel skeleton during the drying process, the high cost and danger of supercritical drying greatly limit the large-scale production and application of airgel materials.

Method used

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  • A kind of method and application of making water glass airgel product by freeze-drying method
  • A kind of method and application of making water glass airgel product by freeze-drying method
  • A kind of method and application of making water glass airgel product by freeze-drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 4 times the volume of deionized water to M3.2 industrial water glass at room temperature to dilute, then add 10% hydrochloric acid to adjust the pH to 9, stir evenly, pour into the mold, and place it in the mold A layer of pre-coated reinforced glass fiber wool felt, heated to 60 °C to accelerate the gelation, and stood for 2 hours to form a silica wet gel; a mixed solution of n-hexane and trimethylchlorosilane with a volume ratio of 1:1 Pour into the mold, submerge the wet gel, and let it stand for 24 hours at room temperature for exchange modification; add absolute ethanol to the mold, cover the surface of the wet gel, soak and clean at room temperature for 24 hours, collect the waste liquid after cleaning, and then use distilled water Wash once, and recover the waste liquid; place the product in the mold on the partition in the freeze-drying box, freeze and cool down until the liquid substance in the wet gel product crystallizes into a frozen body; turn on the vac...

Embodiment 2

[0029] Add 5 times the volume of deionized water to M3.2 industrial water glass at room temperature to dilute, then add hydrochloric acid with a mass concentration of 10% to adjust the pH value to 10, stir evenly, pour it into the mold, and place it in the mold A layer of pre-coated reinforced glass fiber felt is heated to 60°C to accelerate the gelation, and the silica wet gel is made after standing for 2 hours; a mixed solution of n-hexane and trimethylchlorosilane with a volume ratio of 1:1 Pour into the mold, submerge the wet gel, and stand at room temperature for 36 hours to exchange and modify; add absolute ethanol to the mold, cover the surface of the wet gel, soak and clean at room temperature for 36 hours, collect the waste liquid after cleaning, and then use distilled water Wash 2 times and recover the waste liquid; place the product in the mold on the partition plate of the freeze drying box, freeze and cool down until the liquid substance in the wet gel product crys...

Embodiment 3

[0033] Add 4.5 times the volume of deionized water to M3.2 industrial water glass at room temperature to dilute, then add hydrochloric acid with a mass concentration of 10% to adjust the pH value to 9-10, stir evenly and pour it into the mold. Place a layer of pre-coated reinforced glass fiber felt inside, heat up to 60°C to accelerate gelation, and let it stand for 2 hours to make silica wet gel; mix n-hexane and trimethylchlorosilane with a volume ratio of 1:1 Pour the mixed solution into the mold, submerge the wet gel, and stand at room temperature for 30 hours to exchange and modify; add absolute ethanol to the mold to cover the surface of the wet gel, soak and wash at room temperature for 30 hours, collect the waste liquid after cleaning, and then Rinse twice with distilled water and recover the waste liquid; place the product in the mold on the partition plate in the freeze-drying box, freeze and cool down until the liquid substance in the wet gel product crystallizes int...

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Abstract

The invention discloses a method for manufacturing a water glass aerogel product by using a freeze-drying method and an application of the product. The method comprises the following steps of: preparing silica wet gel; modifying the surface; cleaning; performing freeze-drying; and moving from a die; the freeze-drying process includes the specific steps of: freezing a water glass aerogel product until a liquid substance in the product is crystallized, and then heating at a vacuum degree of 10 to 30Pa until all the ice crystals in the frozen product are sublimated, thus accomplishing the drying; and the drying is carried out at twice. An aerogel plate manufactured by the method is lightweight, appears white and light yellow, has no cracks on the surface, is completely hydrophobic, is at the fire rating A and completely noncombustible, and has an extreme effect on sound absorbing and insulating. The product can be prepared into a structure of a large block which is convenient for practical application. The product manufactured by the method has a large specific surface area, high porosity, low density and low heat conductivity coefficient. According to the method, massive industrial production can be carried out, and the cost is reduced. A thermal insulation material prepared from the aerogel product can be widely applied to thermal insulation and sound insulation of a compartment body of a vehicle, thermal insulation of petro-chemical pipelines, thermal insulation of wall bodies of a building, etc.

Description

technical field [0001] The invention relates to the field of thermal insulation and energy-saving materials, in particular to a method for making water glass aerogel products by a freeze-drying method and its application. Background technique [0002] Aerogel is a kind of highly dispersed solid material in which colloidal particles or polymer molecules aggregate with each other to form a nanoporous network structure, and the pores are filled with gaseous dispersion medium. The unique nanostructure of aerogel makes it have many characteristics, such as low thermal conductivity, low sound speed, low density and high specific surface area, etc., and has excellent thermal insulation and sound insulation properties. SiO 2 Aerogel is one of the most typical nanoporous materials. It has very low thermal conductivity and good transmittance of visible light and near-infrared light. The transmittance of solar radiation is higher than 90%. It has good infrared blocking performance, ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/16
Inventor 徐征
Owner 江苏龙睿建设工程有限公司
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