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Preparation method of quaternary xerogel

A xerogel, four-component technology, applied in the field of xerogel preparation, can solve the problems of limited application, fragility, high porosity, etc., to increase the application range, increase the density, and improve the molding performance Effect

Inactive Publication Date: 2010-07-28
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to SiO 2 Xerogel has the structural characteristics of low density and high porosity, so low strength, brittleness, and difficulty in molding are its shortcomings that are difficult to overcome. This shortcoming limits its application in heat insulation and other fields

Method used

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  • Preparation method of quaternary xerogel
  • Preparation method of quaternary xerogel
  • Preparation method of quaternary xerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The mass ratio of raw materials is zirconium oxychloride: aluminum isopropoxide: butyl titanate: ammonia water: tetraethyl orthosilicate: absolute ethanol=1~3:1~3:2~4:5~8:16~ 20: 90-110. Adjust the pH with dilute hydrochloric acid. Aluminum isopropoxide and zirconium oxychloride are used as one group of raw materials to be hydrolyzed together, and the pH value of the solution during hydrolysis is 4.0 to 4.5; ethyl orthosilicate and butyl tertate are used together as another group, and the pH value of the solution during hydrolysis is 2.5 to 3.0. Keep the temperature of the solution at 70-75°C, and keep stirring. After about 10-20 minutes, mix the two sets of solutions, and add dilute NaOH solution to the solution dropwise while stirring continuously, until a gel is formed.

Embodiment 2

[0016] The obtained gel was placed in a tetraethyl orthosilicate-absolute ethanol solution prepared at a volume ratio of 1:1 for aging for 15 hours, and the aging temperature was 60°C. Soak the aged gel in n-heptane for 24 hours at 70°C. Soak the soaked gel in trimethylchlorosilane for 12 hours, then take it out, and dry it at 50°C under normal pressure for 12 hours to obtain SiO 2 -TiO 2 -Al 2 o 3 -ZrO 2 Four-component dry gel.

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Abstract

The invention relates to a preparation method of SiO2-TiO2-Al2O3-ZrO2 quaternary xerogel, which adopts tetraethoxysilane, zirconium Oxychloride, aluminium iso-propoxide, Tetrabutyl orthotita, ammonia water and ethanol as main raw materials; during the preparation process of the SiO2 xerogel, the compositions of Al2O3, TiO2 and ZrO2 are firstly simultaneously introduced by adopting the sol-gel method, and the net skeleton strength of the gel is improved by adjusting the proportion of different raw materials and controlling the formation condition of the gel. The formation of the gel is characterized in that: aluminium iso-propoxide and zirconium Oxychloride hydrolysate and the tetraethoxysilane and tetrabutyl orthotita hydrolysate are respectively prepared by a two-step method according to the properties of the raw materials, and the gel is prepared under a given condition after mixing the aluminium iso-propoxide and zirconium Oxychloride hydrolysate and the tetraethoxysilane and tetrabutyl orthotita hydrolysate. The SiO2-TiO2-Al2O3-ZrO2 quaternary xerogel can be prepared under the condition of the atmospheric pressure of 50 DEG C through the aging, dipping and washing and hydrophobic modification treatment. The quaternary xerogel can be used for the heat preservation and the heat insulation. The analysis of the instruments approves that: the porosity of the prepared xerogel can reach 90 percent, the specific surface area is 190 to 210m2 / g, and the wetting angle of the water is more than 130 degrees in the air.

Description

Technical field: [0001] The invention relates to the preparation technology of xerogel. Especially relate to a kind of sol-gel method to prepare SiO 2 -TiO 2 -Al 2 o 3 -ZrO 2 Four-component xerogel approach. technical background: [0002] Xerogel is a new type of light and porous solid material. Due to its extremely low density, large porosity and specific surface area, it is widely used in optics, acoustics, thermal insulation, catalysis and other fields. For example, someone abroad has introduced SiO 2 Dry gel powder is added to the wall material or wall surface coating, which plays a better role in thermal insulation. Compared with aerogel, xerogel has the same structural characteristics but requires less preparation conditions, which has become one of the current research hotspots. [0003] Due to SiO 2 Xerogel has the structural characteristics of low density and high porosity, so low strength, brittleness, and difficulty in molding are its shortcomings that ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00
Inventor 王黔平陈明华吴卫华李亚君郭治崔海滨
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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