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A kind of atmospheric pressure drying preparation method of mineral nanofiber airgel

A nanofiber, atmospheric drying technology, used in ceramic products, applications, household appliances, etc., to achieve the effect of reducing production costs, low thermal conductivity, and good mechanical properties

Inactive Publication Date: 2017-06-16
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology only combines mineral fibers with airgel to improve its strength (Chinese invention patent CN 102557578, a preparation method of carbon nanofiber airgel composite material)
However, the research on improving the physical and chemical properties of aerogels by using mineral nanofibers directly as the unit structure of aerogels has not been reported yet.

Method used

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  • A kind of atmospheric pressure drying preparation method of mineral nanofiber airgel
  • A kind of atmospheric pressure drying preparation method of mineral nanofiber airgel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The purified chrysotile is used as raw material and mechanically emulsified under the action of a dispersant to obtain nanofiber suspension. The suspension is filtered, washed and dried to obtain a nanofiber filter cake. Weigh 2.0g of nanofibers, add them to 100ml of water, add 1.0g of sodium stearate and 0.02g of sodium polyacrylate, and stir well to form a uniform sol system with a viscosity of about 6000mPa·s. Then strong stirring is carried out, and air is introduced into the sol for foaming. After foaming, the foam volume is about 350ml, and the foaming ratio is 3.5 times. Then pour the foam into a square mold, vibrate it, maintain it at 90% humidity and 40°C for 10 hours, and then dry it at 55°C to obtain a block-shaped air condensation with a density of 0.017g / cm3 and a thermal conductivity of 0.028W / m·K Glue samples. internal honeycomb structure see figure 1 , the cell walls of the honeycomb are cross-linked by nanofibers, see figure 2 .

Embodiment 2

[0030] Using silicon oxide nanofibers obtained by acid leaching of chilliophilus nanofibers as raw materials, weigh 3.0 g of nanofibers, add them to 100 ml of water, add 0.5 g of sodium sulfosuccinate, and 5 ml of 30% H 2 o 2 and 0.1g polyvinyl alcohol, after fully stirring to form a uniform sol system, its viscosity is about 7800mPa·s. Then carry out strong stirring, and inject an appropriate amount of KI solution at the same time, so that the H 2 o 2 Decomposition produces O 2 The gas is foamed. After foaming, the foam volume is about 450ml, and the foaming ratio is 4.5 times. Then pour the foam into a square mold, vibrate, and dry at 60°C to obtain a bulk airgel sample with a density of 0.015g / cm3 and a thermal conductivity of 0.025W / m·K.

Embodiment 3

[0032] The purified sepiolite is used as a raw material, and the nanofiber suspension is obtained by adding a dispersant for grinding and emulsification. The suspension is filtered, washed and dried to obtain a nanofiber filter cake. Weigh 2.5g of nanofibers, add them to 100ml of water, add 1ml of cement foaming agent and 0.05g of hydroxypropyl methylcellulose, and stir well to form a uniform sol system with a viscosity of about 4000mPa·s. Then carry out strong stirring, and use the air pump to input air at the same time, and carry out foaming. After foaming, the foam volume is about 280ml, and the foaming ratio is 2.8 times. Then pour the foam into a square mold, vibrate, and dry at 50°C to obtain a bulk airgel sample with a density of 0.024g / cm3 and a thermal conductivity of 0.038W / m·K.

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Abstract

The invention relates to an ambient-pressure drying preparation method for mineral nanofiber aerogel. Nonmetallic mineral raw materials are purified and scattered, so that mineral nanofibers are acquired; the mineral nanofibers are scattered in a proper amount of water, a foaming agent, a bonder and the like are added, a mixture is fully and evenly stirred, and even colloidal sol containing a certain number of the nanofibers is acquired; the colloidal sol is converted into stable foam through physical foaming or chemical foaming or physical-chemical foaming; the foam is poured into a mold, ambient-pressure drying or ambient-pressure maintenance-drying is conducted, and therefore the mineral nanofiber aerogel is acquired. The prepared mineral nanofiber aerogel is simple in process, short in production period, high in controllability, low in equipment requirement and easy to industrially produce on a large scale. The prepared mineral nanofiber aerogel has the advantages of being controllable in shape, low in density and heat conductivity, good in mechanical property and the like.

Description

technical field [0001] The invention relates to the field of preparation and application of inorganic non-metallic materials, mineral materials and ultrafine materials, in particular to a method for preparing mineral nanofiber aerogels under normal pressure and drying. Background technique [0002] Airgel is a special gel that replaces the liquid in the gel with gas without essentially changing the network structure or volume of the gel itself. It is the product of hydrogel or organic gel after drying. The volume ratio of air in the airgel accounts for more than 90% of the entire volume, so its other title is "frozen smoke". These unique structures of airgel endow it with many excellent properties, such as low density, low thermal conductivity, high specific surface area, high porosity, high light transmittance, low refractive index, low dielectric constant, low sound velocity and quality It has a very broad application prospect in many fields such as aerospace, solar energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B28/00C04B14/46
Inventor 刘琨朱宾楠唐学昆刘欢冯其明段涛
Owner CENT SOUTH UNIV
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