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Method for preparing silicon dioxide aerogel powder

A silica and aerogel technology, applied in the direction of silica, silica, chemical instruments and methods, etc., can solve the problems of long process cycle, low product quality, increased process cost, etc., and achieve easy recycling Utilization, the production process is simple, and the effect of shortening the drying time

Inactive Publication Date: 2010-09-22
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Atmospheric pressure drying is generally based on low surface tension solvent replacement. The process cycle is very long and the solvent consumption is large. What's more, there are common defects of low product quality. Even if it is improved by gel hydrophobic modification, the general effect is limited , which increases the cost of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: common industrial sodium silicate (modulus 3.5, concentration is 23%) is mixed with weight percent concentration and is 10% sodium silicate solution 30ml, under stirring condition, slowly drips into the 5% sodium silicate that 50ml is housed In a dilute sulfuric acid container until the pH value is 4, add 2ml of formamide, gel at room temperature for 10h, age for 2d, wash the resulting gel with distilled water for 4 times, add the treated gel to a tank containing 150ml of n-butanol in a beaker, then stirred evenly, heated and azeotropically distilled until evaporated to dryness, and then moved into a blast drying oven at 105°C for 2 hours to obtain a pore volume of 1.85ml / g and a specific surface of 558m 2 / g silica airgel powder.

Embodiment 2

[0015] Embodiment 2: common industrial sodium silicate (modulus 3.5, concentration is 23%) is mixed with weight percent concentration and is 10% sodium silicate solution 30ml, under stirring condition, slowly drips into the 5% sodium silicate that 50ml is housed In a dilute sulfuric acid container until the pH value is 4, add 2ml of N, N-dimethylformamide, gel at room temperature for 12 hours, and age for 2 days. The resulting gel is washed 4 times with distilled water, and the treated gel is Add it into a beaker containing 150ml of n-butanol, then stir evenly, heat and azeotropically distill until evaporated to dryness, then move it into a blast drying oven and dry it at 105°C for 2 hours to obtain a pore volume of 2.1ml / g and a specific surface area 760m 2 / g silica airgel powder.

Embodiment 3

[0016] Embodiment 3: common industrial sodium silicate (modulus 3.5, concentration is 23%) is mixed with weight percentage concentration and is 10% sodium silicate solution 30ml, under stirring condition, slowly drips into the 5% sodium silicate that 50ml is housed In a dilute sulfuric acid container until the pH value is 4, add 2ml of tetrahydrofuran, gel at room temperature for 15h, and age for 2d. The resulting gel is washed 4 times with distilled water, and the treated gel is added to in a beaker, then stirred evenly, heated and azeotropically distilled until evaporated to dryness, and then moved into a blast drying oven at 105°C for 2 hours to obtain a pore volume of 1.2ml / g and a specific surface of 379m 2 / g silica airgel powder.

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Abstract

The invention discloses a method for preparing preparing silicon dioxide aerogel powder, which comprises the following steps: adding acid into sodium silicate solution to make a pH value equal to 3 to 6; adding a chemical drying control agent into mixture and standing to form gel; after the gel is sufficiently aged, adding an azeotropic distillation organic solvent into the gel to distill to form a primary dried product; and drying the primary dried product to form silicon dioxide aerogel powder. The method uses the common commercial sodium silicate as the raw material to prepare the silicon dioxide aerogel powder and has the advantages that the raw material is easily obtained; the normal pressure is used for preparation; the chemical drying control agent is adopted to prolong the gelation time to promote uniformity of the gel structure; an azeotropic distillation drying process is adopted to control a stress level when the solvent is dried; a pore volume and a specific surface area of the silicon dioxide aerogel are controlled; the pore volume reaches 1.2 to 3.0ml / g; the specific surface area reaches 300m2 / g to 800m2 / g; and compared with the normal pressure drying, the drying time is shortened and the like. The organic solvent is easy to realize recycling. And the production process is simple and the production cost is low.

Description

Technical field: [0001] The invention relates to a method for preparing a powder material, in particular to a method for preparing an airgel powder material. Background technique: [0002] Silica airgel generally refers to the amorphous silica material with air as the dispersion medium, especially the type with low density, high porosity and specific surface area, which brings a series of heat, light, electricity Excellent performance in terms of sound, sound and adsorption, it has broad application prospects in thermal insulation, photoelectricity, acoustics, adsorption, catalysis and other fields. [0003] No matter what method is used to prepare silica airgel, it needs to be dried to produce products with excellent performance, and the ordinary drying method causes the product to shrink significantly due to the surface tension acting on the weak network structure, making silica airgel The excellent performance is lost. Therefore, the theory and process related to drying...

Claims

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Application Information

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IPC IPC(8): C01B33/14C01B33/158
Inventor 童跃进马荣张志建岳瑞丽关怀民
Owner FUJIAN NORMAL UNIV
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