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Method for preparing brucite fiber reinforced SiO2 aerogel heat-insulating material

A technology of brucite fiber and thermal insulation materials, applied in chemical instruments and methods, silicon dioxide, inorganic chemistry, etc., can solve problems such as expensive raw materials, high equipment requirements, and large particle size of sunscreen agents, and achieve technological and equipment Effects of simplification, enhanced mechanical properties, and good hydrophobicity

Inactive Publication Date: 2006-07-19
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the opacifier is also generally large, and it is difficult to achieve uniform dispersion in the airgel matrix, thus affecting the thermal insulation performance of the airgel nanostructure
[0005] At present, the preparation of airgel in my country mostly uses organosilicon compounds as the silicon source, and the raw material is expensive; in the preparation, the product is dried by supercritical drying method, which requires high equipment, high energy consumption, and complex and harsh process conditions, which make the airgel expensive to prepare
All these factors have hindered the large-scale application of aerogels.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add the industrial TiO of water glass glue quality 10% in the waterglass glue through ion exchange 2 powder, 30% tap water, and chemical dispersant for brucite fiber with TiO 2 Sodium dodecylbenzenesulfonate with a total mass of 15%, ball milled for 1.5 hours, poured into a mixer, added brucite fiber with a length of less than 5mm in a mass of 6% of water glass glue, beaten and stirred for half an hour, injected into the metal Mold, heated at 40°C until cured. Then wash the cured body with distilled water until it is neutral, soak it in absolute ethanol for 48 hours, then soak it in a commercially available silicone solution for 10 minutes, and finally dry it under normal pressure at 55°C to obtain the product. The product has no volume shrinkage, good hydrophobicity, and a density of 0.21g / cm 3 , The thermal conductivity is 0.012W / M.K.

Embodiment 2

[0022] In the commercially available industrial silica sol liquid of solid content 25%, add the industrial Fe of silica sol liquid quality 5% 3 o 4 powder, 10% tap water, and brucite fiber and Fe 3 o 4 20% of the total mass of di-isooctyl sodium maleate sulfonate, ball milled for 2 hours, poured into the mixer, adding brucite fiber with a length of 9% of the mass of the silica sol solution and less than 5mm in length, beating and stirring for 1 hour, Pour into the mold and heat at 50°C until solidified. Then it was washed with distilled water to neutrality, then soaked in absolute ethanol for 36 hours, then impregnated with organic silicon for 20 minutes, and finally dried under normal pressure at 65°C to obtain the product. The product has no volume shrinkage, good hydrophobicity, and a density of 0.43g / cm 3 , The thermal conductivity is 0.025W / M.K.

Embodiment 3

[0024] Add the industrial TiO of water glass glue quality 15% in the waterglass glue through ion exchange 2 Powder, 20% tap water, and brucite fiber and TiO 2 Sodium lauryl sulfate with a mass sum of 25%, ball milled for 1 hour, poured into a mixer, added brucite fiber with a length of less than 5mm in a water glass glue with a mass of 7.5%, beaten and stirred for 1 hour, injected into a mould, at 35 °C until solidified. Then wash the cured body with distilled water until it becomes neutral, then soak it in absolute ethanol for 48 hours, then soak it with a commercially available silicone solution for 30 minutes, and finally dry it under normal pressure at 60°C to obtain the product. The product has no volume shrinkage, good hydrophobicity, and a density of 0.40g / cm 3 , The thermal conductivity is 0.020W / M.K.

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Abstract

The invention discloses a preparation method for brucite fiber reinforcement SiO2 aerogel heat insulating material. Wherein, with industrial water glass or silicasol and natural brucite staple fiber as material, using high-energy ball grinding and chemical dispersion method to realize size refining for inorganic opacifier and even distribution before sol solidification; splitting the natural brucite staple fiber into nano diameter with chemical dispesion method as reinforcing material. This invention overcomes the volume shrinkage problem by substituting solvent and hydrophobisation treatment and fiber reinforcement. The materila has density as 0.20~0.50g / cm3 and thermal conductivity factor as 0.010~0.030w / m*k.

Description

technical field [0001] The invention relates to a preparation method of an inorganic non-metal matrix composite material, in particular to a natural brucite fiber-reinforced SiO 2 A preparation method of an inorganic airgel heat insulating material. Background technique [0002] Compared with traditional inorganic heat insulation materials, inorganic airgel is a new type of super heat insulation material, which is a kind of light-weight material composed of inorganic colloidal particles agglomerated with each other to form a nanoporous network structure, and the pores are filled with gaseous dispersion medium. Amorphous solid material has the characteristics of low density, large specific surface area, high porosity, small pore size and narrow distribution. Since the heat conduction and heat convection of thermal insulation materials are related to the structural scale of the material, when the pore and structural scale in the material reach the nanometer level, especially ...

Claims

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Application Information

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IPC IPC(8): C01B33/14C01B33/158C09K21/02
Inventor 刘开平梁庆宣
Owner CHANGAN UNIV
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