Nanosized silica thermal insulation material and preparation method based on normal-temperature drying wet process thereof

A nano-silicon oxide, thermal insulation technology, applied in the field of thermal insulation materials and thermal insulation, can solve the problems of long production cycle, high cost, and wide application

Active Publication Date: 2014-05-21
CHINA BUILDING MATERIALS ACAD +1
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  • Abstract
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  • Claims
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Problems solved by technology

However, silica airgel materials need to be prepared by sol-gel and supercritical drying pro...

Method used

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  • Nanosized silica thermal insulation material and preparation method based on normal-temperature drying wet process thereof
  • Nanosized silica thermal insulation material and preparation method based on normal-temperature drying wet process thereof
  • Nanosized silica thermal insulation material and preparation method based on normal-temperature drying wet process thereof

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Embodiment 1-7

[0029] Embodiment 1-7, prepare nano silicon oxide thermal insulation material with normal temperature dry wet process

[0030] The raw material formula of embodiment 1-7 nano silicon oxide thermal insulation material is as shown in table 1:

[0031] Table 1 Embodiment 1-7 Raw material formula of nano-silica thermal insulation material (addition unit in the table: parts by weight)

[0032]

[0033]In the examples, the nano silicon oxide powder is prepared by the gas phase method (preferred) or the liquid phase method and has undergone hydrophobic treatment. For the method of preparing nano silicon oxide by the gas phase method, see, Shao Q G, Gu G B, Zhang L J.The application research of micro emulsion in the preparation of nanometer materials.New Chemical Materials.2001,29(7):9-13), the method of preparing nano silicon oxide by liquid phase method, see, Hu Bing, Jiang Binbo, Chen Jizhong. Monodisperse Preparation and application of non-reactive SiO2. Chemical progress. 200...

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Abstract

The invention discloses a nanosized silica thermal insulation material and a preparation method based on a normal-temperature drying wet process thereof. The method comprises the following steps: adding nano silica powder, a ceramic powder opacifying agent, a xonotlite whisker or other enhanced fibers or whiskers subjected to hydrophobic treatment to a container with a water solution containing a binder; adding a foaming agent to rapidly agitate into even foam; carrying out suction filtration to obtain concentrated foam slurry; finally, orderly carrying out filter-pressing molding and normal-temperature drying on the concentrated foam slurry, so as to obtain the nanosized silica thermal insulation material. The method disclosed by the invention has the advantages of being short in production cycle (one day in general), simple in process, low in cost, and easy for realization of mechanical large-scale production. The nanosized silica thermal insulation material prepared by using the method has heat preservation and heat insulation performances similar to a monox aerogel thermal insulation material, the heat conductivity coefficient at 100 DEG C is smaller than 0.02W/m.K, and the heat conductivity coefficient below 700 DEG C is smaller than 0.05W/m.K.

Description

technical field [0001] The invention belongs to the technical field of heat insulation and heat preservation materials, and in particular relates to a nano-silicon oxide heat insulation and heat preservation material prepared by a normal-temperature dry-wet process. Background technique [0002] At present, the high temperature resistant heat insulation materials used in the field of heat insulation and heat preservation technology are mainly microporous ceramic materials with pore diameters ranging from a few microns to a few millimeters, prepared from ceramic fibers, whiskers, ceramic hollow microspheres or hollow spheres. (Zhang Lijie, Porous SiO 2 Preparation and Characterization of Base Blocks, Master Thesis of Beihang University, 2010, 11-14). The room temperature thermal conductivity of these materials is usually greater than 0.04W / m·K, and the thermal insulation performance is far from meeting the needs of some application fields that require high-efficiency thermal...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B28/26C04B26/28C04B26/04C04B38/02C04B14/06
Inventor 陈玉峰石兴张世超孙浩然王广海李懋强
Owner CHINA BUILDING MATERIALS ACAD
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