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 sour

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Industrial TiO with 10% mass of water glass glue was added to the ion-exchanged water glass glue 2 powder, 30% tap water, and chemical dispersant for brucite fiber with TiO 2 Sodium dodecyl benzene sulfonate with a total mass of 15%, ball-milled for 1.5 hours, poured into a mixer, added brucite fibers with a length of less than 5mm and 6% by mass of water glass glue, beating and stirring for half an hour, and then injected with metal mold, heated at 40°C until cured. Then, the solidified body was washed with distilled water until neutral, soaked in absolute ethanol for 48 hours, then immersed in a commercially available silicone solution for 10 minutes, and finally dried at 55°C under normal pressure 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.

Example Embodiment

[0021] Embodiment 2

[0022] Add 5% industrial Fe by mass of the silica sol to the commercially available industrial silica sol solution with a solid content of 25% 3 O 4 powder, 10% tap water, and brucite fiber with Fe 3 O 4 The total mass of 20% sodium diisooctyl maleate sulfonate was ball-milled for 2 hours, poured into a mixer, and 9% of the mass of the silica sol solution was added with brucite fibers with a length of less than 5 mm, and after beating and stirring for 1 hour, Pour into molds and heat at 50°C until cured. Then washed with distilled water until neutral, soaked with absolute ethanol for 36 hours, then soaked with silicone for 20 minutes, and finally dried at 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.

Example Embodiment

[0023] Embodiment 3

[0024] Industrial TiO with 15% mass of water glass glue was added to the ion-exchanged water glass glue 2 powder, 20% tap water, and brucite fiber with TiO 2 Sodium dodecyl sulfate with a total mass of 25%, ball milled for 1 hour, poured into a mixer, added with 7.5% of the water glass glue mass and brucite fibers with a length of less than 5 mm, beat and stirred for 1 hour, poured into the mold, at 35 Heat at °C until cured. Then, the solidified body was washed with distilled water until neutral, soaked with absolute ethanol for 48 hours, then soaked with commercially available silicone solution for 30 minutes, and finally dried at 60°C under normal pressure 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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