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Hydrophobic gas-phase SiO2 nano-pore heat-insulating material and preparation method thereof

A thermal insulation material, hydrophobic technology, applied in the field of hydrophobic gas phase SiO2 nanoporous thermal insulation material and its preparation, can solve the problem of increased dielectric constant of gas phase silica, inconvenient material storage, transportation and handling, collapse of nanoporous structure and thermal insulation effect and other problems, to achieve the effect of low physiological inertia, excellent mechanical properties, and excellent heat resistance

Active Publication Date: 2014-07-23
HUBEI HUIFU NANOMATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although fumed silica has excellent thermal insulation performance, due to its own structural characteristics, the surface silicon atoms are easy to combine with the surface adsorbed water to maintain the tetrahedral coordination of oxygen, so there are a large amount of silicon in the inner wall of the nano-silica. Hydroxyl, on the one hand, these hydroxyl groups can be used to fix active groups and endow nano-mesoporous materials with new properties; Nano-mesoporous materials are very sensitive to environmental humidity and can easily absorb moisture and moisture in the air
The absorbed moisture can not only greatly increase the dielectric constant of fumed silica, but also cause a strong capillary surface tension inside the fumed silica, and when this surface tension reaches a certain level, the nanopore structure will collapse. So that the thermal insulation effect is greatly reduced
This seriously restricts its use in moisture-proof equipment, and at the same time, it also brings great inconvenience to the storage, transportation and handling of materials in the air environment

Method used

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  • Hydrophobic gas-phase SiO2 nano-pore heat-insulating material and preparation method thereof
  • Hydrophobic gas-phase SiO2 nano-pore heat-insulating material and preparation method thereof

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Embodiment 1

[0039] In this embodiment, a kind of hydrophobic gas phase SiO 2 Nanoporous thermal insulation material, prepared from the following raw material components: 75wt% hydrophobic gas phase SiO 2 , 7wt% pretreated glass fiber, 13wt% infrared shielding agent and 5wt% inorganic binder (calcined kaolin: wollastonite powder: sodium silicate: diatomaceous earth at a mass ratio of 1:2:1:1.5).

[0040] The above-mentioned hydrophobic gas phase SiO 2 A method for preparing a nanoporous heat insulating material, comprising the steps of:

[0041] (1) Gas-phase SiO 2 Put it in the reactor and stir, the stirring speed is 600r / min, and the temperature is 200°C. After stirring for 1h, add the surface treatment agent into the reactor in a spray state, adjust the stirring speed to 750r / min, and conduct heat treatment at 200°C for 4h to obtain hydrophobicity. Vapor SiO 2 (Carbon content up to 4.5%);

[0042] Among them, gas phase SiO 2 The mass ratio with the surface treatment agent is 89:11...

Embodiment 2

[0047] In this embodiment, a kind of hydrophobic gas phase SiO 2 Nanoporous thermal insulation material, prepared from the following raw material components: 65wt% hydrophobic gas phase SiO 2 , 10wt% pretreated glass fiber, 15wt% infrared shielding agent and 10wt% inorganic binder (calcined kaolin: wollastonite powder: sodium silicate: diatomaceous earth at a mass ratio of 1:2:1:1.5).

[0048] The above-mentioned hydrophobic gas phase SiO 2 A method for preparing a nanoporous heat insulating material, comprising the steps of:

[0049] (1) Gas-phase SiO 2 Put it in the reactor and stir at a stirring speed of 500r / min and a temperature of 300°C. After stirring for 1 hour, add the surface treatment agent into the reactor in a spray state, adjust the stirring speed to 650r / min, and conduct heat treatment at 220°C for 3 hours to obtain hydrophobicity. Vapor SiO 2 (Carbon content up to 3.2%);

[0050] Among them, gas phase SiO 2 The mass ratio of surface treatment agent is 90:...

Embodiment 3

[0055] In this embodiment, a kind of hydrophobic gas phase SiO 2 Nanoporous thermal insulation material, prepared from the following raw material components: 80wt% hydrophobic gas phase SiO 2 , 5wt% pretreated glass fiber, 10wt% infrared shielding agent and 5wt% inorganic binder (calcined kaolin: wollastonite powder: sodium silicate: diatomaceous earth at a mass ratio of 1:2:1:1.5).

[0056] The above-mentioned hydrophobic gas phase SiO 2 A method for preparing a nanoporous heat insulating material, comprising the steps of:

[0057] (1) Gas-phase SiO 2 Place in the reactor and stir at a stirring speed of 500r / min and a temperature of 120°C. After stirring for 1 hour, add the surface treatment agent into the reactor in a spray state, adjust the stirring speed to 600r / min, and conduct heat treatment at 200°C for 3 hours to obtain hydrophobicity. Vapor SiO 2 (Carbon content reaches 4.1%);

[0058] Among them, gas phase SiO 2 The mass ratio with the surface treatment agent i...

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Abstract

The invention discloses a hydrophobic gas-phase SiO2 nano-pore heat-insulating material and a preparation method thereof. The material is prepared from the following raw materials in percent by weight: 60-80% of hydrophobic gas-phase SiO2, 3-10% of pretreated glass fiber, 8-20% of an infrared shielding agent and 3-10% of an inorganic adhesive. The heat-insulating material has excellent hydrophobic performance, heat-insulting performance and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a hydrophobic gas-phase SiO 2 Nanoporous thermal insulation material and its preparation method. Background technique [0002] According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials with a pore size ranging from 2 to 50 nm become mesoporous materials. In 1992, Mobil Corporation developed a new type of M41S series mesoporous silica materials for the first time, which aroused the interest of researchers. Great attention has been paid to mesoporous silica material, due to its high specific surface area, high porosity, regular and adjustable pore size distribution, stable skeleton structure, and simple preparation process, it will soon become a new type of light-weight alternative to airgel materials. Quality insulation material. The currently popular nano-mesoporous thermal insulation material is based on...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/06C04B14/42
Inventor 段先健陈燕玉杜海晶吴春蕾
Owner HUBEI HUIFU NANOMATERIAL CO LTD
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